HAWAIIAN ELECTRIC CO INC
10-K, 1998-03-27
ELECTRIC SERVICES
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<PAGE>
 
================================================================================

               UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549
                                   FORM 10-K

          [X]  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                        SECURITIES EXCHANGE ACT OF 1934
                  For the fiscal year ended December 31, 1997
                                      OR
          [ ]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF
                      THE SECURITIES EXCHANGE ACT OF 1934

COMMISSION      REGISTRANT; STATE OF INCORPORATION;        I.R.S. EMPLOYER
FILE NUMBER     ADDRESS; AND TELEPHONE NUMBER              IDENTIFICATION NO.
- -----------     -----------------------------------        ------------------
1-8503          HAWAIIAN ELECTRIC INDUSTRIES, INC.         99-0208097
                (A Hawaii Corporation)
                900 Richards Street
                Honolulu, Hawaii 96813
                Telephone (808) 543-5662

1-4955          HAWAIIAN ELECTRIC COMPANY, INC.            99-0040500
                (A Hawaii Corporation)
                900 Richards Street
                Honolulu, Hawaii 96813
                Telephone (808) 543-7771

SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT:

                                                           NAME OF EACH EXCHANGE
REGISTRANT                         TITLE OF EACH CLASS     ON WHICH REGISTERED
- ----------                         -------------------     --------------------
Hawaiian Electric Industries, Inc. Common Stock,           New York Stock
                                   Without Par Value       Exchange
Hawaiian Electric Industries, Inc. Guarantee with          New York Stock
                                   respect to 8.36%        Exchange
                                   Trust Originated
                                   Preferred Securities
                                   (SM) (TOPrS (SM))
Hawaiian Electric Industries, Inc. Preferred Stock         New York Stock
                                   Purchase Rights         Exchange
Hawaiian Electric Company, Inc.    Guarantee with          New York Stock
                                   respect to 8.05%        Exchange
                                   Cumulative Quarterly
                                   Income Preferred
                                   Securities Series 1997
                                   (QUIPS(SM))

SECURITIES REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT:

REGISTRANT                             TITLE OF EACH CLASS
- ----------                             -------------------
Hawaiian Electric Industries, Inc.     None
Hawaiian Electric Company, Inc.        Cumulative Preferred Stock

================================================================================

     Indicate by check mark whether the registrant (1) has filed all reports to 
be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during 
the preceding 12 months (or for shorter period that the registrant was required 
to file such reports), and (2) has been subject to such filing requirements for 
the past 90 days.  Yes   X    No
                        ---      ---

     Indicate by check mark if disclosure of delinquent filers pursuant to Item 
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements 
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K.                                                                   [ ]
================================================================================
<PAGE>
 
================================================================================

<TABLE> 
<CAPTION> 
                                  AGGREGATE MARKET VALUE     NUMBER OF SHARES OF
                                 OF THE VOTING STOCK HELD    COMMON STOCK OUT-
                                 BY NONAFFILIATES OF THE      STANDING OF THE
                                 REGISTRANTS ON MARCH 13,     REGISTRANTS ON
                                           1998               MARCH 13, 1998
                                 ------------------------    -------------------
<S>                              <C>                         <C> 
Hawaiian Electric Industries,    
Inc.                                  $1,300,041,000              32,001,007    
                                                             (Without par value)

Hawaiian Electric Company, Inc.            N/A                    12,805,843
                                                             ($6 2/3 par value)
</TABLE> 
================================================================================

                      DOCUMENTS INCORPORATED BY REFERENCE

<TABLE> 
<CAPTION> 
                                                                              PART OF FORM 10-K  
                                                                                INTO WHICH THE
                                                                                 DOCUMENT IS
                       DOCUMENT                                                 INCORPORATED
- ------------------------------------------------------------------------   -------------------------
<S>                                                                        <C>
Portions of Annual Reports to Stockholder(s) of the following
 registrants for the fiscal year ended December 31, 1997:

   Hawaiian Electric Industries, Inc....................................   Parts I, II, III, and IV

   Hawaiian Electric Company, Inc.......................................   Parts I, II, III, and IV

Portions of Proxy Statement of Hawaiian Electric Industries, Inc.,
 dated March 13, 1998, for the Annual Meeting of Stockholders                     Part III
</TABLE> 

================================================================================

THIS COMBINED FORM 10-K REPRESENTS SEPARATE FILINGS BY HAWAIIAN ELECTRIC 
INDUSTRIES, INC. AND HAWAIIAN ELECTRIC COMPANY, INC.  INFORMATION CONTAINED 
HEREIN RELATING TO ANY INDIVIDUAL REGISTRANT IS FILED BY EACH REGISTRANT ON ITS
OWN BEHALF.  NEITHER REGISTRANT MAKES ANY REPRESENTATIONS AS TO THE INFORMATION 
RELATING TO THE OTHER REGISTRANT.

================================================================================
<PAGE>
 
                               TABLE OF CONTENTS
                                        

<TABLE>
<CAPTION>

                                                                                         Page
<S>                                                                                      <C> 
Glossary of Terms........................................................................  ii



                                    PART I

Item 1.      Business....................................................................   1
Item 2.      Properties..................................................................  42
Item 3.      Legal Proceedings...........................................................  44
Item 4.      Submission of Matters to a Vote of Security Holders.........................  44


                                    PART II

Item 5.      Market for Registrants' Common Equity and Related Stockholder Matters.......  45
Item 6.      Selected Financial Data.....................................................  46
Item 7.      Management's Discussion and Analysis of Financial Condition
                and Results of Operations................................................  46
Item 7a.     Quantitative and Qualitative Disclosures About Market Risk..................  46
Item 8.      Financial Statements and Supplementary Data.................................  46
Item 9.      Changes in and Disagreements with Accountants on Accounting
                and Financial Disclosure.................................................  46


                                   PART III

Item 10.     Directors and Executive Officers of the Registrants.........................  47
Item 11.     Executive Compensation......................................................  49
Item 12.     Security Ownership of Certain Beneficial Owners and Management..............  53
Item 13.     Certain Relationships and Related Transactions..............................  54


                                    PART IV

Item 14. Exhibits, Financial Statement Schedules and Reports on Form 8-K................. 54
Independent Auditors' Report - HEI....................................................... 56
Independent Auditors' Report - HECO...................................................... 57
Index to Exhibits........................................................................ 62
Signatures............................................................................... 79

</TABLE>

                                       i
<PAGE>
 
                               GLOSSARY OF TERMS

Defined below are certain terms used in this report:

 
TERMS      DEFINITIONS
- --------   -----------

1935 ACT   Public Utility Holding Company Act of 1935
AES        Applied Energy Services, Inc.
AES-BP     AES Barbers Point, Inc. (now known as AES Hawaii, Inc.)
ARM        Adjustable rate mortgage
ASB        American Savings Bank, F.S.B., a wholly owned subsidiary of HEI
              Diversified, Inc. and parent company of American Savings
              Investment Services Corporation, ASB Service Corporation,
              AdCommunications, Inc. and American Savings Mortgage Co., Inc.
BoA        Bank of America, FSB
BHP        BHP Petroleum Americas Refining Inc., a fuel oil supplier
BIF        Bank Insurance Fund
BPPI       Baldwin Pacific Properties, Inc., a limited partner of Baldwin*Malama
             (a limited partnership in which Malama Development Corp. is the
             general partner)
Btu        British thermal unit
CDUP       Conservation District Use Permit
CERCLA     Comprehensive Environmental Response, Compensation and Liability Act
CHEVRON    Chevron Products Company, a fuel oil supplier
COMPANY    Hawaiian Electric Industries, Inc. and its direct and indirect
             subsidiaries, including, without limitation, Hawaiian Electric
             Company, Inc., Maui Electric Company, Limited, Hawaii Electric
             Light Company, Inc., HECO Capital Trust I, HEI Investment Corp.,
             Malama Pacific Corp. and its subsidiaries, Hawaiian Tug & Barge
             Corp., Young Brothers, Limited, HEI Diversified, Inc., American
             Savings Bank, F.S.B. and its subsidiaries, HEIDI Real Estate Corp.,
             Pacific Energy Conservation Services, Inc., HEI Power Corp. and its
             subsidiaries, Hycap Management, Inc., Hawaiian Electric Industries
             Capital Trust I, Hawaiian Electric Industries Capital Trust II and
             Hawaiian Electric Industries Capital Trust III
CONSUMER    Division of Consumer Advocacy, Department of Commerce and Consumer
 ADVOCATE    Affairs of the State of Hawaii
CT          Combustion turbine
DOH         Department of Health of the State of Hawaii
DOT         Department of Transportation of the State of Hawaii
DSM         Demand-side management
ENCOGEN     Encogen Hawaii, L.P.
ENSERCH     Enserch Development Corporation
EPA         Environmental Protection Agency - federal
EPCRA       Emergency Planning and Community Right-to-Know Act
ERL         Environmental Response Law of the State of Hawaii
FASB        Financial Accounting Standards Board
FDIC        Federal Deposit Insurance Corporation
FDICIA      Federal Deposit Insurance Corporation Improvement Act of 1991
FEDERAL     U.S. Government
FERC        Federal Energy Regulatory Commission
FHLB        Federal Home Loan Bank
FIRREA      Financial Institutions Reform, Recovery, and Enforcement Act of 1989

                                      ii
<PAGE>
 
                         GLOSSARY OF TERMS (continued)
<TABLE> 
<CAPTION> 

 
TERMS          DEFINITIONS
- --------       -----------
<S>            <C> 
 
HCPC           Hilo Coast Processing Company
HC&S           Hawaiian Commercial & Sugar Company, a division of A&B-Hawaii,
               Inc.
HECO           Hawaiian Electric Company, Inc., a wholly owned electric utility
                     subsidiary of Hawaiian Electric Industries, Inc. and parent
                     company of Maui Electric Company, Limited, Hawaii Electric
                     Light Company, Inc. and HECO Capital Trust I
HECO'S         Hawaiian Electric Company, Inc.'s Consolidated Financial 
  CONSOLIDATED       Statements, incorporated into Parts I, II and IV of this 
  FINANCIAL          Form 10-K by reference to pages 12 to 34 of Hawaiian 
  STATEMENTS         Electric Company, Inc's 1997 Annual Report to 
                     Stockholder, portions of which are filed herein as 
                     HECO Exhibit 13
 HECO'S MD&A   Hawaiian Electric Company, Inc.'s Management's Discussion and
                     Analysis of Financial Condition and Results of Operations,
                     incorporated into Parts I, II and IV of this Form 10-K by
                     reference to pages 3 to 11 of Hawaiian Electric Company,
                     Inc.'s 1997 Annual Report to Stockholder, portions of which
                     are filed herein as HECO Exhibit 13
HEI            Hawaiian Electric Industries, Inc., direct parent company of
                     Hawaiian Electric Company, Inc., HEI Investment Corp.,
                     Malama Pacific Corp., Hawaiian Tug & Barge Corp., HEI
                     Diversified, Inc., Pacific Energy Conservation Services,
                     Inc., HEI Power Corp., Hycap Management, Inc., Hawaiian
                     Electric Industries Capital Trust I, Hawaiian Electric
                     Industries Capital Trust II and Hawaiian Electric
                     Industries Capital Trust III
HEI'S          Hawaiian Electric Industries, Inc.'s Consolidated Financial
   CONSOLIDATED      Statements, incorporated into Parts I, II and IV of this 
   FINANCIAL         Form 10-K by reference to pages 26 and 40 to 65 of 
   STATEMENTS        Hawaiian Electric Industries, Inc.'s 1997    
                     Annual Report to Stockholders, portions of which are filed 
                     herein as HEI Exhibit 13  
HEI'S MD&A     Hawaiian Electric Industries, Inc.'s Management's Discussion and
                     Analysis of Financial Condition, Results of Operations and Market Risk
                     incorporated into Parts I, II and IV of this Form 10-K by reference to
                     pages 27 to 39 of Hawaiian Electric Industries, Inc.'s 1997 Annual
                     Report to Stockholders, portions of which are filed herein as HEI
                     Exhibit 13
HEIDI          HEI Diversified, Inc., a wholly owned subsidiary of Hawaiian Electric
                     Industries, Inc. and the parent company of American Savings Bank,
                     F.S.B. and HEIDI Real Estate Corp.
HEIIC          HEI Investment Corp., a wholly owned subsidiary of Hawaiian Electric
                     Industries, Inc.
HEIPC          HEI Power Corp., a wholly owned subsidiary of Hawaiian Electric
                     Industries, Inc. and parent company of several subsidiaries
HELCO          Hawaii Electric Light Company, Inc., a wholly owned electric utility
                     subsidiary of Hawaiian Electric Company, Inc.
HERS           Hawaiian Electric Renewable Systems, Inc., formerly a wholly owned
                     subsidiary of Hawaiian Electric Industries, Inc. and formerly parent
                     company of Lalamilo Ventures, Inc.
HIG            The Hawaiian Insurance & Guaranty Company, Limited, an insurance
                     company which was placed in state rehabilitation proceedings.  HEI
                     Diversified, Inc. was the holder of record of HIG's common stock prior
                     to August 16, 1994
</TABLE> 

                                      iii
<PAGE>
 
                         GLOSSARY OF TERMS (continued)

<TABLE> 
<CAPTION> 
 
TERMS      DEFINITIONS
- --------   -----------

<S>         <C>  
HIRI        Hawaiian Independent Refinery, Inc., a fuel oil refinery
HITI        Hawaiian Interisland Towing, Inc.
HP          Horsepower
HPG         HEI Power Corp. Guam, a wholly owned subsidiary of HEI Power Corp.
HTB         Hawaiian Tug & Barge Corp., a wholly owned subsidiary of Hawaiian
              Electric Industries, Inc. and parent company of Young Brothers, Limited
IBEW        International Brotherhood of Electrical Workers
IBU         Inlandboatmen's Union of the Pacific, Marine Division, an affiliate of
              the International Longshoremen's and Warehousemen's Union, Hawaii
              Division
ILWU        International Longshoremen's and Warehousemen's Union
IPP         Independent power producer
IRP         Integrated resource plan
IRR         Interest rate risk
JCC         Jones Capital Corporation
KALAELOA    Kalaeloa Partners, L.P.
KCP         Kawaihae Cogeneration Partners
KWH         Kilowatthour
LSFO        Low sulfur fuel oil
LVI         Lalamilo Ventures, Inc., formerly a wholly owned subsidiary of Hawaiian
              Electric Renewable Systems, Inc. and formerly a wholly owned subsidiary
              of Hawaiian Electric Industries, Inc. LVI was merged into HELCO on
              December 23, 1996
MBtu        Million British thermal unit
MD&A        Management's Discussion and Analysis of Financial Condition and Results
              of Operations
MDC         Malama Development Corp., a wholly owned subsidiary of Malama Pacific
              Corp.
MECO        Maui Electric Company, Limited, a wholly owned electric utility
              subsidiary of Hawaiian Electric Company, Inc.
MMO         Malama Mohala Corp., a wholly owned subsidiary of Malama Pacific Corp.
MPC         Malama Pacific Corp., a wholly owned subsidiary of Hawaiian Electric
              Industries, Inc. and parent company of several real estate subsidiaries
MSFO        Medium sulfur fuel oil
MW          Megawatt
NA          Not applicable
NAE         North American Environmental, Inc.
NOI         Notice of intent
NOV         Notice of Violation
NPDES       National Pollutant Discharge Elimination System
OPA         Federal Oil Pollution Act of 1990
OTS         Office of Thrift Supervision, Department of Treasury
PCB         Polychlorinated biphenyls
PECS        Pacific Energy Conservation Services, Inc., a wholly owned subsidiary
              of Hawaiian Electric Industries, Inc.
PGV         Puna Geothermal Venture
PSD PERMIT  Prevention of Significant Deterioration/Covered Source Permit
PUC         Public Utilities Commission of the State of Hawaii
PURPA       Public Utility Regulatory Policies Act of 1978

</TABLE> 
                                      iv
<PAGE>
 
                         GLOSSARY OF TERMS (continued)
<TABLE> 
<CAPTION> 
 
TERMS         DEFINITIONS
- --------      -----------
<S>           <C> 

QTL           Qualified Thrift Lender
RCRA          Resource Conservation and Recovery Act of 1976
REGISTRANT    Hawaiian Electric Industries, Inc. or Hawaiian Electric Company, Inc.
ROACE         Return on average common equity
ROR           Return on rate base
SAIF          Savings Association Insurance Fund
SARA          Superfund Amendments and Reauthorization Act
SEC           Securities and Exchange Commission
SFAS          Statement of Financial Accounting Standards
ST            Steam turbine
STATE         State of Hawaii
TSCA          Toxic Substance Control Act of 1976
UIC           Underground Injection Control
UST           Underground storage tank
YB            Young Brothers, Limited, a wholly owned subsidiary of
                  Hawaiian Tug & Barge Corp.
</TABLE> 

                                       v
<PAGE>
 
Forward-looking information

This report and other presentations made by HEI, HECO and their subsidiaries
contain forward-looking statements within the meaning of Section 21E of the
Securities Exchange Act of 1934. Except for historical information contained
herein, the matters set forth are forward-looking statements that involve
certain risks and uncertainties that could cause actual results to differ
materially from those in the forward-looking statements. Potential risks and
uncertainties include, but are not limited to, such factors as the effect of
international, national and local economic conditions, including the condition
of the Hawaii tourist and construction industries and the Hawaii housing market;
the effects of weather and natural disasters; product demand and market
acceptance risks; increasing competition in the electric utility industry;
capacity and supply constraints or difficulties; new technological developments;
governmental and regulatory actions, including decisions in rate cases and on
permitting issues; the results of financing efforts; the timing and extent of
changes in interest rates; and the results of integration of the acquired Bank
of America, FSB (BoA) - Hawaii operations  with the operations of ASB. Investors
are also directed to consider other risks and uncertainties discussed in other
periodic reports previously and subsequently filed by HEI and/or HECO with the
SEC.



                                     PART I
                                     ------

ITEM 1.        BUSINESS

HEI
- ---

HEI was incorporated in 1981 under the laws of the State of Hawaii and is a
holding company with subsidiaries engaged in the electric utility, savings bank,
freight transportation, real estate development and other businesses, primarily
in the State of Hawaii, and in the pursuit of independent power projects in Asia
and the Pacific. HEI's predecessor, HECO, was incorporated under the laws of the
Kingdom of Hawaii (now the State of Hawaii) on October 13, 1891. As a result of
a 1983 corporate reorganization, HECO became an HEI subsidiary and common
shareholders of HECO became common shareholders of HEI.

HECO and its operating subsidiaries, MECO and HELCO, are regulated electric
public utilities providing the only electric public utility service on the
islands of Oahu, Maui, Lanai, Molokai and Hawaii. HECO also owns all the common
securities of HECO Capital Trust I. HECO Capital Trust I (a Delaware statutory
business trust in which HECO owns all the common securities) was formed to
effect the issuance of $50 million of 8.05% cumulative quarterly income
preferred securities in March 1997 for the benefit of HECO, MECO and HELCO.

Besides HECO, HEI also owns directly or indirectly the following subsidiaries
which comprise its diversified companies: HEIDI and its subsidiaries, HEIDI Real
Estate Corp. and ASB, and the subsidiaries of ASB; HTB and its subsidiary; MPC
and its subsidiaries; HEIIC; PECS; HEIPC and its subsidiaries; Hycap Management,
Inc. and its subsidiary; Hawaiian Electric Industries Capital Trust I; and
Hawaiian Electric Industries Capital Trust II and III (inactive entities).

ASB, acquired in 1988, was the third largest financial institution in the State
of Hawaii as of December 31, 1997, and had 69 retail branches as of
December 31, 1997. On December 6, 1997, ASB acquired substantially all of the
Hawaii deposits of BoA, most of its Hawaii branches and certain of its Hawaii-
based loans. The acquisition increased ASB's assets by $1.8 billion and its
deposits by $1.7 billion. HEIDI Real Estate Corp. was formed in February 1998 to
own and manage real estate assets.

HTB was acquired in 1986 and provides ship assist and charter towing services
and owns YB, a regulated intrastate public carrier of waterborne freight among
the Hawaiian Islands. MPC was formed in 1985 and directly or through
subsidiaries develops and invests in real estate. HEIIC was formed in 1984 and
is a passive investment company which primarily holds investments in leveraged
leases. PECS was formed in August 1994 and is a contract services company
primarily providing limited support services in Hawaii. HEIPC was formed in
March 1995 to pursue, directly or through its subsidiaries or affiliates,
independent power projects in Asia and the Pacific. Hycap Management, Inc.,
including subsidiary HEI Preferred Funding, LP (a limited partnership in which
Hycap Management, Inc. is the sole general partner), and Hawaiian Electric
Industries Capital Trust I (a Delaware statutory business 

                                       1
<PAGE>
 
trust in which HEI owns all the common securities) were formed to effect the
issuance of $100 million of 8.36% HEI-obligated trust preferred securities in
February 1997.

Prior to August 16, 1994, HEIDI was the holder of record of the common stock of
HIG, which was acquired in 1987 and provided property and casualty insurance
primarily in Hawaii. For information about the discontinued operations of HIG,
see Note 20 to HEI's Consolidated Financial Statements which is incorporated
herein by reference to page 63 of HEI's 1997 Annual Report to Stockholders,
portions of which are filed herein as HEI Exhibit 13.

The financial information about the Company's industry segments is incorporated
herein by reference to page 26 of HEI's 1997 Annual Report to Stockholders,
portions of which are filed herein as HEI Exhibit 13.

For additional information about the Company, reference is made to Item 7 and
Item 7A -"HEI's Management's Discussion and Analysis of Financial Condition,
Results of Operations and Market Risk" (HEI's MD&A) and to Item 14-HEI's
Consolidated Financial Statements, incorporated herein by reference to pages 27
to 39 and to page 26 and pages 40 to 65, respectively, of HEI's 1997 Annual
Report to Stockholders, portions of which are filed herein as HEI Exhibit 13.

ELECTRIC UTILITY
- ----------------

HECO and subsidiaries and service areas

HECO, MECO and HELCO are regulated operating electric public utilities engaged
in the production, purchase, transmission, distribution and sale of electricity
on the islands of Oahu; Maui, Lanai and Molokai; and Hawaii, respectively. HECO
was incorporated under the laws of the Kingdom of Hawaii (now State of Hawaii)
on October 13, 1891. HECO acquired MECO in 1968 and HELCO in 1970.

In 1997, the electric utilities' revenues and operating income amounted to
approximately 76% and 83%, respectively, of HEI's consolidated revenues and
operating income. For additional information about HECO, see HEI's MD&A and
Note 3, incorporated herein by reference to pages 27 to 39 and 47 to 50,
respectively, in HEI's 1997 Annual Report to Stockholders, and HECO's MD&A and
HECO's consolidated financial statements incorporated by reference to pages 3 to
11 and 12 to 34, respectively, of HECO's 1997 Annual Report to Stockholder,
portions of which are filed herein as HECO Exhibit 13.

The islands of Oahu, Maui, Lanai, Molokai and Hawaii have a combined population
estimated at 1,130,000, or approximately 95% of the population of the State of
Hawaii, and comprise a service area of 5,766 square miles. The principal
communities served include Honolulu (on Oahu), Wailuku and Kahului (on Maui) and
Hilo and Kona (on Hawaii). The service areas also include numerous suburban
communities, resorts, U.S. Armed Forces installations and agricultural
operations.

HECO, MECO and HELCO have nonexclusive franchises from the state covering
certain areas, which authorize them to construct, operate and maintain
facilities over and under public streets and sidewalks. HECO's franchise covers
the City & County of Honolulu, MECO's franchises cover the County of Maui and
the County of Kalawao, and HELCO's franchise covers the County of Hawaii. Each
of these franchises will continue in effect for an indefinite period of time
until forfeited, altered, amended or repealed.

Sales of electricity

HECO, MECO and HELCO provide the only electric public utility service on the
islands they serve. The following table sets forth the number of their electric
customer accounts as of December 31, 1997, 1996 and 1995 and their electric
sales revenues for each of the years then ended:

<TABLE>
<CAPTION>
                                 1997                       1996                      1995
                     -------------------------------------------------------------------------------------
                                      Electric                   Electric                  Electric
(dollars in             Customer        sales       Customer        sales     Customer        sales
 thousands)             accounts     revenues       accounts     revenues     accounts     revenues
- ---------------------------------------------------------------------------------------------------
<S>                     <C>          <C>            <C>        <C>            <C>        <C>    
HECO.................    271,801     $  779,425    271,602     $  767,264    269,307       $712,380
MECO.................     54,605        151,625     53,763        144,434     53,339        127,284
HELCO................     60,220        160,332     59,349        152,312     58,515        135,110
                     ------------------------------------------------------------------------------
                         386,626     $1,091,382    384,714     $1,064,010    381,161       $974,774
                     ==============================================================================
</TABLE>

                                       2
<PAGE>
 
Revenues from the sale of electricity in 1997 were from the following types of
customers in the proportions shown:
<TABLE>
<CAPTION>
                                                        HECO            MECO            HELCO           Total
- ----------------------------------------------------------------------------------------------------------------
<S>                                                     <C>             <C>             <C>             <C>
Residential......................................        32%             36%             41%             34%
Commercial.......................................        30              34              37              32
Large light and power............................        37              29              22              34
Other............................................         1               1              --              --
                                                 ---------------------------------------------------------------
                                                        100%            100%            100%            100%
                                                 ===============================================================
</TABLE>

HECO and its subsidiaries derived approximately 10% of their operating revenues
from the sale of electricity to various federal government agencies in 1997,
1996 and 1995. One of HECO's larger customers, the Naval Base at Barbers Point,
Oahu, is expected to be closed in 1999 with redevelopment of the base occurring
through 2020. HECO anticipates that the base closure will ultimately result in
little, if any, loss in aggregate KWH sales, if, as anticipated, the Navy
continues to occupy portions of Barbers Point and much of the surplus facilities
and land currently not utilized by the Navy is occupied by state agencies and
others. On March 8, 1994, President Clinton signed an Executive Order which
mandates that each federal agency develop and implement a program with the
intent of reducing energy consumption by 30% by the year 2005 to the extent that
these measures are cost-effective. The 30% reductions will be measured relative
to the agency's 1985 energy use. HECO is working with various federal government
agencies such as the Department of Defense to implement demand-side management
programs which will help them achieve their energy reduction objectives. In
November 1995, HECO and the U.S. General Services Administration entered into a
Basic Ordering Agreement under which HECO will arrange for financing and
installation of energy conservation projects at federal facilities in Hawaii.
Under the Basic Ordering Agreement, HECO undertook an air conditioning upgrade
project at the federal office building in downtown Honolulu, which project was
completed in 1997. Further, HECO commenced design work for solar water heating
in this federal office building. Another project underway is with the Postal
Service. HECO also signed an umbrella Basic Ordering Agreement with the
Department of Defense in October 1996. There are currently seven projects
underway for the Navy. Neither HEI nor HECO management can predict with
certainty the impact of President Clinton's Executive Order on the Company's or
consolidated HECO's future financial condition, results of operations or
liquidity.

                                       3
<PAGE>
 
SELECTED CONSOLIDATED ELECTRIC UTILITY OPERATING STATISTICS

<TABLE>
<CAPTION>
                                                1997          1996         1995         1994         1993
                                          ------------------------------------------------------------------
 
KWH SALES (MILLIONS)
<S>                                          <C>           <C>          <C>          <C>          <C>
Residential...............................       2,531.0      2,540.4      2,471.3      2,427.5      2,340.3
Commercial................................       2,676.8      2,662.4      2,624.7      2,451.2      2,284.6
Large light and power.....................       3,700.7      3,733.0      3,655.1      3,658.6      3,646.2
Other.....................................          54.7         55.4         55.4         55.8         54.1
                                          ------------------------------------------------------------------
                                                 8,963.2      8,991.2      8,806.5      8,593.1      8,325.2
                                          ==================================================================
 
 
NET ENERGY GENERATED AND PURCHASED
 (MILLIONS OF KWH)
Net generated.............................       5,885.9      5,994.3      5,850.6      5,727.6      5,789.6
Purchased.................................       3,622.8      3,565.3      3,511.6      3,437.8      3,101.0
                                          ------------------------------------------------------------------
                                                 9,508.7      9,559.6      9,362.2      9,165.4      8,890.6
                                          ==================================================================
 
 
Losses and system uses (%)................           5.5          5.7          5.7          6.0          6.1
 
ENERGY SUPPLY (YEAREND)
Generating capability--MW.................         1,634        1,636        1,637        1,637        1,638
Firm purchased capability--MW.............           474          474          469          465          473
                                          ------------------------------------------------------------------
                                                   2,108        2,110        2,106        2,102        2,111
                                          ==================================================================
 
 
Gross peak demand--MW (1).................         1,573        1,561        1,537        1,527        1,496
Btu per net KWH generated.................        10,799       10,781       10,762       10,746       10,846
Average fuel oil cost per MBtu (cents)....         405.9        388.8        329.7        304.4        340.5
 
CUSTOMER ACCOUNTS (YEAREND)
Residential...............................       336,094      333,807      330,508      325,495      320,987
Commercial................................        48,671       49,069       48,585       47,916       48,008
Large light and power.....................           582          586          580          601          628
Other.....................................         1,279        1,252        1,488        1,480        1,475
                                          ------------------------------------------------------------------
                                                 386,626      384,714      381,161      375,492      371,098
                                          ==================================================================
</TABLE>

<TABLE>
<CAPTION>
ELECTRIC REVENUES (THOUSANDS)
<S>                                          <C>           <C>           <C>          <C>          <C>
Residential...............................    $  367,432   $  355,669     $324,923     $297,984     $283,662
Commercial................................       347,308      338,785      313,909      281,664      262,751
Large light and power.....................       369,878      362,823      329,598      314,931      317,816
Other.....................................         6,764        6,733        6,344        5,927        5,786
                                          -------------------------------------------------------------------
                                              $1,091,382   $1,064,010     $974,774     $900,506     $870,015
                                          ===================================================================
 
 
AVERAGE REVENUE PER KWH SOLD (CENTS)
Residential...............................         14.52        14.00        13.15        12.28        12.12
Commercial................................         12.97        12.73        11.96        11.49        11.50
Large light and power.....................          9.99         9.72         9.02         8.61         8.72
Other.....................................         12.38        12.16        11.46        10.62        10.69
Average revenue per KWH sold..............         12.18        11.83        11.07        10.48        10.45
 
RESIDENTIAL STATISTICS
Average annual use per customer account
 (KWH)....................................         7,559        7,649        7,514        7,482        7,367
Average annual revenue per customer
 account..................................      $  1,097     $  1,071     $    988     $    918     $    893
Average number of customer accounts.......       334,811      332,138      328,912      324,458      317,657
- ------------------------------------------------------------------------------------------------------------------
</TABLE>

(1) Sum of the peak demands on all islands served, noncoincident and
    nonintegrated.

                                       4
<PAGE>
 
GENERATION STATISTICS

The following table contains certain generation statistics as of December 31,
1997, and for the year ended December 31, 1997. The capability available for
operation at any given time may be less than the generating capability shown
because of capability restrictions or temporary outages for inspection,
maintenance, repairs or unforeseen circumstances.

<TABLE>
<CAPTION>
                                         
                                         Generating and
                                         firm purchased                                                   KWH net
                                           capability                                                    generated
                                             (MW) at        Gross peak                      Annual          and
                                          December 31,        demand        Reserve          load        purchased
               Systems                      1997 (1)         (MW) (2)        margin       factor (2)     (millions) 
- -------------------------------------------------------------------------------------------------------------------
 <S>                                       <C>                <C>            <C>            <C>            <C> 
ISLAND OF OAHU-HECO
Conventional oil-fired steam units...           1,160.0
Combustion turbines (peaking units)..             103.0
Firm contract power (3)..............             406.0
                                     ------------------------------------------------------------------------------
                                                1,669.0        1,220.0           36.8%          72.1%       7,424.2
                                     ------------------------------------------------------------------------------
ISLAND OF MAUI-MECO
Conventional oil-fired steam units...              37.6
Combined-cycle unit..................              58.0
Diesel...............................              95.9
Firm contract power (4)..............              16.0
                                     ------------------------------------------------------------------------------
                                                  207.5          174.7           18.8%          70.2%       1,039.0
                                     ------------------------------------------------------------------------------
ISLAND OF LANAI-MECO
Diesel...............................              10.4            5.0          110.1%          65.6%          27.9
                                     ------------------------------------------------------------------------------
ISLAND OF MOLOKAI-MECO
Diesel...............................               9.9
Combustion turbine...................               2.2
                                     ----------------------------------------------------------------------------
                                                   12.1           6.6          83.3%          66.5%          37.1
                                     ----------------------------------------------------------------------------
ISLAND OF HAWAII-HELCO
Conventional oil-fired steam units...              71.2
Combustion turbines..................              48.2
Diesel...............................              38.0
Firm contract power (4)..............              52.0
                                     ----------------------------------------------------------------------------
                                                  209.4         166.7          25.6%          69.3%         980.5
                                     ----------------------------------------------------------------------------
Total................................           2,108.4       1,573.0          34.0%          71.6%       9,508.7
                                     ============================================================================
</TABLE>
 
(1) HECO units at normal ratings, and MECO and HELCO units at reserve ratings.
(2) Noncoincident and nonintegrated.
(3) Independent power producers-180 MW (Kalaeloa), 180 MW (AES-BP) and 46 MW
    (refuse-fired plant).
(4) Nonutility generation-MECO: 16 MW (HC&S); HELCO: 30EMW (PGV) and 22 MW
    (HCPC).

INTEGRATED RESOURCE PLANNING AND REQUIREMENTS FOR ADDITIONAL GENERATING CAPACITY

As a result of a proceeding initiated in January 1990, the PUC issued an order
in March 1992 (and revised it in May 1992) requiring the energy utilities in
Hawaii to develop integrated resource plans (IRPs). The goal of integrated
resource planning is the identification of demand-side and supply-side resources
and the integration of these resources for meeting near- and long-term consumer
energy needs in an efficient and reliable manner at the lowest reasonable cost.
In its May 1992 order, the PUC adopted a "framework", which establishes both the
process for developing IRPs and guidelines for the development of such plans.
The PUC's framework directs that each plan cover a 20-year planning horizon with
a five-year program implementation schedule and states that the planning cycle
will be 

                                       5
<PAGE>
 
repeated every three years. Under the framework, the PUC may approve, reject or
require modifications of the utilities' IRPs.

The framework also states that utilities are entitled to recover all appropriate
and reasonable integrated resource planning and implementation costs, including
the costs of planning and implementing demand-side management (DSM) programs.
Under appropriate circumstances, the utilities may recover net lost revenues
resulting from DSM programs and earn shareholder incentives. The PUC has
approved IRP cost recovery provisions for HECO, MECO and HELCO. Pursuant to the
cost recovery provisions, the electric utilities may recover through a surcharge
the costs for approved DSM programs (including DSM program lost margins and
shareholder incentives), and other IRP costs incurred and approved by the PUC,
to the extent the costs are not included in their base rates.

The utilities have characterized their proposed IRPs as planning strategies,
rather than fixed courses of action, and the resources ultimately added to their
systems may differ from those included in their 20-year plans. Under the IRP
framework, the utilities are required to submit annual evaluations of their
plans (including a revised five-year program implementation schedule) and to
submit new plans on a three-year cycle. Prior to proceeding with the DSM
programs, separate PUC approval proceedings must be completed, in which the PUC
further reviews the details of the proposed programs and the utilities
proposals for the recovery of DSM program expenditures net lost revenues and
shareholder incentives.


HECO's IRP.  HECO filed its second IRP with the PUC in January 1998, and a
schedule for the PUC proceeding in which it will be considered has not yet been
determined. The second IRP identified changes in key forecasts and assumptions
since the development of HECO's initial IRP, which was filed in July 1993,
modified in January 1994 and approved by the PUC as modified in its March 1995
final decision and order (D&O). HECO's second IRP includes IRP strategy options
related to the transition to a more competitive environment in the electric
utility  industry. The IRP is a flexible resource strategy that allows the
utility to make major decisions regarding the incremental implementation of
program options for both supply-side and demand-side resources, based on HECO's
IRP objectives and the best information available at the time decisions must be
made.

On the supply-side, HECO's second IRP focuses on the planning for the next
generating unit addition in the 2009 time frame -- a 107-MW simple cycle diesel
fired combustion turbine, which would be part of a 318-MW diesel fired 2-on-1
combined-cycle unit.  Phases 2 and 3 of the combined-cycle unit would be
installed in 2013 and 2016, respectively.  In addition, pursuant to HECO's
generation asset management program, all existing generation units are
reasonably expected to operate (future environmental considerations permitting)
beyond the 20-year IRP planning period (1998-2017).

HECO's second IRP includes five energy efficiency DSM programs, which are
designed to reduce the rate of increase in Oahu's energy use, defer construction
of new generating units, reduce the state's dependence on oil, and achieve
savings for utility customers who participate in the programs. The DSM energy
efficiency programs include incentives for customers to install efficient
lighting, refrigeration, water-heating and air-conditioning equipment and
industrial motors. The PUC issued its final D&Os approving all five of HECO's
original energy efficiency DSM programs in 1996, and HECO began implementing
these programs in the third quarter of 1996. HECO filed applications with the
PUC for a commercial and industrial (C&I) load management program in June 1996,
and a residential load control program in September 1997. HECO expects that
these two load management DSM programs will be reviewed in concept by the PUC in
conjunction with HECO's second IRP. HECO plans to continue the planning and
implementation of DSM load management and energy efficiency programs that are
cost-effective and also minimize rate impacts to all customers.

MECO's IRP. The PUC issued its final D&O in MECO's IRP proceeding in May 1996.
MECO's 20-year IRP includes four energy efficiency DSM programs similar to those
developed for HECO. The supply-side resources proposed by MECO, as updated in
its June 1997 evaluation, include installing approximately 214 MW of additional
generation through the year 2013 on the island of Maui, including 58 MW of
generation at its Maalaea power plant site in three increments from 1998-2001,
and approximately 8 MW through the year 2013 on each of the islands of Lanai and
Molokai. The PUC approved MECO's DSM water heating program in July 1996, and
MECO's C&I DSM programs in September 1996. MECO began DSM program implementation
in late 1996. MECO's first IRP annual evaluation was filed with the PUC in June
1997, and its second IRP annual evaluation is scheduled to be filed with the PUC
in June 1998. MECO's next IRP filing is scheduled for September 1999.

                                       6
<PAGE>
 
In 1997, MECO's generation reserve margins were less than the margin specified
by its capacity planning criteria (which are based on having enough reserve
generation to cover for the unexpected loss of the largest unit taking into
account projected peak loads and scheduled maintenance). This condition will
probably continue, particularly in view of the recent reduction in the
generation capacity being supplied by HC&S (see below under "Nonutility
generation--MECO and HELCO power purchase agreements"), until Maalaea unit 17
begins commercial operations.

HELCO's IRP. The PUC issued its final D&O in HELCO's IRP proceeding in May 1996.
HELCO's 20-year IRP includes four energy efficiency DSM programs similar to
those developed for HECO. The supply-side resources proposed in HELCO's five-
year plan include installing 58 MW of generation at a West Hawaii site (see
"HELCO power situation" below), undertaking transmission and distribution
efficiency improvement projects and conducting alternate energy generation
resource studies. HELCO's 20-year plan includes adding another diesel-fired
dual-train combined-cycle unit at a  West Hawaii site. HELCO received interim
approval for its four DSM programs in October 1995 and final approval in
September 1996. HELCO began implementing its DSM programs in December 1995.
HELCO filed an application with the PUC for a C&I pilot load management program
in October 1996. HELCO's first IRP annual evaluation was filed with the PUC in
June 1997. HELCO's next IRP filing is scheduled for September 1998.

HELCO POWER SITUATION

For a description of regulatory and judicial proceedings that have delayed
HELCO's efforts to install additional generation in order to ease potential
power supply constraints on the island of Hawaii, see the "HELCO power
situation" section in Note 12 to HECO's Consolidated Financial Statements.

Background. In 1991, HELCO identified the need, beginning in 1994, for
additional generation to provide for forecast load growth while maintaining a
satisfactory generation reserve margin, to address uncertainties about future
deliveries of power from existing firm power producers and to permit the
retirement of older generating units. Accordingly, HELCO proceeded with plans to
install at its Keahole power plant site two 20-megawatt (MW) combustion turbines
(CT-4 and CT-5), followed by an 18-MW heat steam recovery generator (ST-7), at
which time these units would be converted to a 56-MW (net) combined-cycle unit.
In January 1994, the PUC approved expenditures for CT-4, which HELCO had planned
to install in late 1994.

Installation of HELCO's phased combined-cycle unit at the Keahole power plant
site has been revised due to delays in (a) obtaining approval from the Hawaii
Board of Land and Natural Resources (BLNR) of a Conservation District Use Permit
(CDUP) amendment and (b) obtaining from the Department of Health of the State of
Hawaii (DOH) and the U.S. Environmental Protection Agency (EPA) a PSD
permit for the Keahole power plant site. Subject to satisfactory resolution of
the CDUP amendment and PSD permit matters, HELCO's current plan continues to be
to have CT-4 and CT-5 be the next generating units added to its system. ST-7 is
currently planned to be deferred to approximately 2006 unless the Encogen
facility (described below) is not placed in service as planned.

CDUP amendment. On July 10, 1997, the Third Circuit Court of the State of Hawaii
issued its Amended Findings of Fact, Conclusions of Law, Decision and Order on
HELCO's appeal of an order of the BLNR, along with other civil cases relating to
HELCO's application for a CDUP amendment. This decision allows HELCO to use its
Keahole property as requested in its application. An amended order to the same
effect was issued on August 18, 1997. Two final judgments have been entered,
disposing of all but one of the consolidated cases. HELCO has submitted a form
of final judgment to dispose of the last case pending pursuant to the court's
directions. Opposing parties have appealed each of the final judgments and have
also filed motions to stay the effectiveness of the judgments pending resolution
of the appeals. A hearing on these motions was held on March 9, 1998, at which
time the judge took the matter under advisement. Management believes that HELCO
will ultimately prevail with regard to any appeals which may be taken and that
the amended decision of the Third Circuit Court will be upheld.

Declaratory judgment actions.  In February 1997, the Keahole Defense Coalition
and three individuals filed a lawsuit in the Third Circuit Court of the State of
Hawaii against HELCO, the director of the DOH, and the BLNR, seeking declaratory
rulings that, with regard to the Keahole project, one or more of the defendants
had violated, or could not allow the plant to operate without violating, the
State Clean Air Act, the State Noise Pollution Act, conditions of HELCO's
conditional use permit, covenants of HELCO's land patent and Hawaii
administrative rules regarding standard conditions applicable to land permits.

In March 1998, an individual filed a complaint for declaratory judgment against
HELCO, BLNR and Department of Land and Natural Resources (DLNR). The complaint
basically alleges a violation of her constitutional due process rights because
the issue of which, if any, land use conditions apply to HELCO's use of the
Keahole site was determined administratively by DLNR (through a letter issued in
January 1998) rather than being decided by BLNR in a contested case. Also filed
with the complaint was a motion to stay enforcement of the DLNR letter.

HELCO intends to vigorously defend against the claims raised and management
believes the allegations are without merit.

                                       7
<PAGE>
 
IPP complaints. Two independent power producers (IPPs), Kawaihae Cogeneration
Partners (KCP) and Enserch Development Corporation (Enserch), filed separate
complaints against HELCO with the PUC in 1993 and 1994, respectively, alleging
that they are entitled to power purchase contracts to provide HELCO with
additional capacity, which they claimed would be a substitute for HELCO's
planned 56-MW combined-cycle unit at Keahole. Under HELCO's current estimate of
generating capacity requirements, there is a near term need for capacity in
addition to the capacity which might be provided by either of the proposed IPP
units.

In September 1995, the PUC allowed HELCO to continue to pursue construction of
and commit expenditures for the second combustion turbine (CT-5) and the steam
recovery generator (ST-7) for its planned combined-cycle unit, stating in its
order that "no part of the project may be included in HELCO's rate base unless
and until the project is in fact installed, and is used and useful for utility
purposes." The PUC also ordered HELCO to continue negotiating with the IPPs and
directed that the facility to be built (i.e., either HELCO's or one of the
IPP's) should be the one that can be most expeditiously put into service at
"allowable cost."

In April 1997, Hilo Coast Processing Company (HCPC) filed a complaint against
HELCO with the PUC, requesting an immediate hearing on HCPC's offer for a new
20-year power purchase contract for its existing facility, which is proposed to
be expanded from 22 MW to 32 MW. HCPC's existing power purchase agreement is
scheduled to terminate at the end of 1999.

     Enserch complaint. In January 1998, HELCO filed with the PUC an application
     -----------------                                                          
     for approval of a power purchase agreement for a 60-MW facility and an
     interconnection agreement with Encogen dated October 22, 1997. The
     agreements were entered into following a settlement agreement between
     Enserch and HELCO and are subject to PUC approval. The parties to the
     proceeding include HELCO, Encogen and the Consumer Advocate. Motions to
     intervene filed by KCP, HCPC and one other IPP were denied by the PUC.

     KCP complaint. In January 1996, the PUC ordered HELCO to continue in good
     -------------                                                            
     faith to negotiate a power purchase agreement with KCP. In May 1997, KCP
     filed a motion for unspecified "sanctions" against HELCO for allegedly
     failing to negotiate in good faith. In June 1997, KCP filed a motion asking
     the PUC to designate KCP's facility as the next generating unit on the
     HELCO system and to determine the "allowable cost" which would be payable
     by HELCO to KCP. HELCO filed memoranda in opposition to KCP's motions. An
     evidentiary hearing was held and briefs were filed by both parties. Action
     by the PUC is pending.

     HCPC complaint. The PUC converted the HCPC complaint into a purchased power
     --------------                                                             
     contract negotiation proceeding. An evidentiary hearing is scheduled for
     April 1998.

Management cannot determine at this time whether the negotiations with KCP and
HCPC and related PUC proceedings will result in the execution and/or PUC
approval of a power purchase agreement or impact management's plans with regard
to installation of HELCO's combined-cycle unit at the Keahole power plant site.

NONUTILITY GENERATION

The Company has supported state and federal energy policies which encourage the
development of alternate energy sources that reduce dependence on fuel oil.
Alternate energy sources range from wind, geothermal and hydroelectric power, to
energy produced by the burning of bagasse (sugarcane waste). Other nonoil
projects include a generating unit burning municipal waste and a fluidized bed
unit burning coal.

HECO power purchase agreements. HECO currently has three major power purchase
agreements. In March 1988, HECO entered into a power purchase agreement with AES
Barbers Point, Inc. (AES-BP, now known as AES Hawaii, Inc.), a Hawaii-based
cogeneration subsidiary of The AES Corporation (formerly known as Applied Energy
Services, Inc.) of Arlington, Virginia. The agreement with AES-BP, as amended in
August 1989, provides that, for a period of 30 years, HECO will purchase 180 MW
of firm capacity. The AES-BP 180-MW coal-fired cogeneration plant, which became
operational in September 1992, utilizes a "clean coal" technology. The facility
is designed to sell sufficient steam to be a "Qualifying Facility" under the
Public Utility Regulatory Policies Act of 1978 (PURPA).

                                       8
<PAGE>
 
In October 1988, HECO entered into an agreement with Kalaeloa Partners, L.P.
(Kalaeloa), a limited partnership whose sole general partner is an indirect,
wholly owned subsidiary of ASEA Brown Boveri, Inc. (ABB), which has guaranteed
certain of Kalaeloa's obligations and, through affiliates, has contracted to
design, build, operate and maintain the facility. The agreement with Kalaeloa,
as amended, provides that HECO will purchase 180 MW of firm capacity for a
period of 25 years beginning May 23, 1991. The Kalaeloa facility, which was
completed in the second quarter of 1991, is a combined-cycle operation,
consisting of two oil-fired combustion turbines burning LSFO and a steam turbine
which utilizes waste heat from the combustion turbines. The facility is designed
to sell sufficient steam to be a "Qualifying Facility" under PURPA. As of
February 28, 1997, the ownership of Kalaeloa was restructured such that 1% is
now owned by the ABB subsidiary as the general partner and 99% is owned by
Kalaeloa Investment Partners (KIP) as the limited partner. KIP is a limited
partnership comprised of CEA Hawaiian Management, Inc. and CEA Investment, Inc.
(nonregulated affiliates of Public Service Enterprise Group Incorporated) and
Harbert Power Corporation. A second phase of the February 28, 1997 transaction,
which is still pending, would transfer the general partner interest from the ABB
subsidiary to an entity affiliated with the owners of KIP. A modification of the
existing ABB Guarantee of Kalaeloa obligations may be part of the second phase.
HECO must consent to any changes in the ABB Guarantee.

HECO also entered into a power purchase contract in March 1986 and a firm
capacity amendment in April 1991 with the City and County of Honolulu, which has
built a 64-MW refuse-fired plant (H-Power). The H-Power facility began to
provide firm energy in 1990 and currently supplies HECO with 46 MW of firm
capacity. The firm capacity amendment provides that HECO will purchase firm
capacity until mid-2015.

The PUC has approved and allowed rate recovery for the costs related to HECO's
three major power purchase agreements which provide a total of 406 MW of firm
capacity, representing 24% of HECO's total generating and firm purchased
capability on the island of Oahu as of December 31, 1997.

MECO and HELCO power purchase agreements.  As of December 31, 1997, MECO and
HELCO had power purchase agreements for 16 MW and 52 MW of firm capacity,
respectively, representing 7% and 25% of their respective total generating and
firm purchased capabilities.

MECO has a power purchase agreement with HC&S for 16 MW of firm capacity through
December 31, 1999. In December 1997, MECO entered into a letter agreement with
HC&S which extends the power purchase agreement through December 31, 2000, and
year-to-year thereafter, subject to termination on or after January 1, 2001, on
not less than two years prior written notice by either party. On March 2, 1998,
an HC&S unit failed and HC&S lost 10 MW of generating capacity. It may be
several months before HC&S is able to replace the unit, during which time HC&S
may not be able to supply MECO with the full contracted capacity.

HELCO has a power purchase agreement with Puna Geothermal Venture (PGV) for 30
MW of firm capacity. On February 12, 1996, HELCO and PGV executed an amendment
to the power purchase agreement for 5 MW of firm capacity in addition to the 25
MW then being supplied. In August 1996, the PUC approved the amendment and, in
September 1996, PGV began supplying 5 MW of additional firm power.

In December 1994, at a time when the Hilo Coast Processing Company (HCPC)
contract was for delivery of 18 MW, HCPC filed a Chapter 11 bankruptcy petition.
In July 1995, the bankruptcy court approved an amended and restated power
purchase agreement with HCPC for 22 MW of firm capacity and the dismissal of
HCPC from bankruptcy. Also, see the "HELCO power situation" section above and in
Note 12 to HECO's Consolidated Financial Statements.

In October 1997, HELCO entered into an agreement with Encogen, a limited
partnership whose general partners are wholly-owned special-purpose subsidiaries
of Enserch and Jones Capital Corporation (JCC). Enserch Corporation and J.A.
Jones, Inc., the parent companies of Enserch and JCC, respectively, have
guaranteed certain of Encogen's obligations, and an affiliate of Enserch will be
contracted to operate and maintain the facility. The agreement provides that
HELCO will purchase 60 MW of firm capacity for a period of 30 years. The
facility will consist of two oil-fired combustion turbines and a steam turbine
which utilizes waste heat from the combustion turbines. The facility will be
designed to sell sufficient steam to be a "Qualifying Facility" under PURPA. The
agreement was submitted to the PUC for approval in January 1998. See "HELCO
Power Situation" above.

                                       9
<PAGE>
 
FUEL OIL USAGE AND SUPPLY

All rate schedules of the Company's electric utility subsidiaries contain energy
cost adjustment clauses whereby the charges for electric energy (and
consequently the revenues of the electric utility subsidiaries generally)
automatically vary with changes in the weighted average price paid for fuel oil
and certain components of purchased energy costs, and the relative amounts of
company-generated power and purchased power. Accordingly, under these clauses,
changes in fuel oil and certain purchased energy costs are passed on to
customers. In the December 30, 1997 D&Os approving HECO and its subsidiaries'
fuel supply contracts, the PUC noted that, in light of the length of the fuel
supply contracts and the relative stability of fuel prices, the need for the
continued use of energy cost adjustment clauses will be the subject of
investigation in a generic docket or in a future rate case. In their rate
increase applications based on 1999 test years, MECO and HELCO stated that they
believe that their energy cost adjustment clauses continue to be necessary. See
discussion below under "Rates" and the "Energy cost adjustment clauses" section
in HECO's MD&A.

HECO's steam power plants burn low sulfur fuel oil (LSFO). HECO's combustion
turbine peaking units burn Number 2 diesel fuel (diesel). MECO's and HELCO's
steam power plants burn medium sulfur fuel oil (MSFO) and their combustion
turbine and diesel engine generating units burn diesel. The LSFO supplied to
HECO is primarily derived from Indonesian and other Far East crude oils
processed in Hawaii refineries. The MSFO supplied to MECO and HELCO is derived
from U.S. domestic crude oil processed in Hawaii refineries.

In December 1997, HECO executed new contracts for the purchase of LSFO and use
of certain fuel distribution facilities with Chevron Products Company (Chevron)
and BHP Petroleum Americas Refining Inc. (BHP). These fuel supply and facilities
operations contracts have a term of seven years commencing January 1, 1998. The
PUC approved the contracts and issued a final decision and order in December
1997 that permits the inclusion of costs incurred under these contracts in
HECO's energy cost adjustment clause. HECO pays market-related prices for fuel
supplies purchased under these agreements.

HECO, MECO, HELCO and affiliates, HTB and YB, executed new joint fuel supply
contracts with Chevron and BHP for the purchase of diesel and MSFO supplies and
for the use of certain petroleum distribution facilities for a period of seven
years commencing January 1, 1998. The PUC subsequently approved these contracts
and issued a final decision and order in December 1997 that permitted the
electric utilities to include fuel costs incurred under these contracts in their
respective energy cost adjustment clauses. The electric utilities and HTB and YB
pay market-related prices for diesel and MSFO supplied under these agreements.

The diesel supplies acquired by the Lanai Division of MECO are purchased under a
contract with a local Chevron-brand wholesaler, Lanai Oil Co., Inc., executed on
February 13, 1997. The PUC issued a final D&O approving the contract in June
1997. The original term of the contract, which provides for the delivery of fuel
to MECO's Lanai  power plants, expired December 31, 1997. The contract continues
under a provision for extension on an "evergreen" basis cancelable by either
party on 180 days advance notice.

See the fuel oil commitments information set forth in the "Fuel contracts and
other purchase commitments" section in Note 12 to HECO's Consolidated Financial
Statements.

The following table sets forth the average cost of fuel oil used to generate
electricity in the years 1997, 1996 and 1995:

<TABLE>
<CAPTION>
                           HECO                      MECO                      HELCO                 Consolidated
               --------------------------------------------------------------------------------------------------------
                   $/Barrel      c/MBtu      $/Barrel      c/MBtu      $/Barrel      c/MBtu      $/Barrel      c/MBtu
- -----------------------------------------------------------------------------------------------------------------------
 
<S>               <C>          <C>          <C>          <C>          <C>          <C>          <C>          <C>
1997...........        23.88        380.9        30.13        503.9        25.76        418.1        25.19        405.9
1996...........        22.57        361.2        29.33        490.6        25.47        413.8        24.08        388.8
1995...........        19.19        306.1        24.78        414.4        21.94        355.1        20.47        329.7
</TABLE>

The average per-unit cost of fuel oil consumed to generate electricity for HECO,
MECO and HELCO reflects a different volume mix of fuel types and grades. In
1997, 99.8% of HECO's generation fuel consumption consisted of LSFO. The balance
of HECO's fuel consumption was diesel. Diesel made up approximately 73% of
MECO's and 32% of HELCO's fuel consumption. The remainder of the fuel
consumption of MECO and HELCO consisted of MSFO. In general, MSFO is the least
costly fuel, 

                                       10
<PAGE>
 
diesel is the most expensive fuel and the price of LSFO falls between the two on
a per barrel basis. The average prices of LSFO, MSFO and diesel in 1997 were
approximately the same as the respective average price levels prevailing in 1996
and 1996 average prices were higher than the respective average prices in 1995.

In December 1997, HELCO and MECO exercised an option to extend for two years
their existing contracts with Hawaiian Interisland Towing, Inc. for the shipment
of MSFO and diesel supplies from their fuel supplier's facilities on Oahu to
storage locations on the islands of Hawaii and Maui, respectively. The PUC
approved these contracts and issued a final order in June 1994 that permitted
HELCO and MECO to include the fuel transportation and related costs incurred
under the original contracts in their respective energy cost adjustment clauses.
Freight rates charged under the contracts are related to published indices for
industrial commodities prices and labor costs. These contracts each include
options for one additional two-year extension.

In 1998, the Company estimates that 76% of the net energy generated and
purchased by HECO and its subsidiaries will be generated from the burning of
oil. Increases in fuel oil prices are passed on to customers through the
electric utility subsidiaries' energy cost adjustment clauses. Failure by the
Company's oil suppliers to provide fuel pursuant to the supply contracts and/or
substantial increases in fuel prices could adversely affect consolidated HECO's
and the Company's financial condition, results of operations and/or liquidity.
HECO, however, maintains an inventory of fuel oil in excess of one month's
supply, which may be used in the event fuel suppliers are not able to provide
fuel pursuant to the contracts for this period of time.

RATES

HECO, MECO and HELCO are subject to the regulatory jurisdiction of the PUC with
respect to rates, issuance of securities, accounting and certain other matters.
See "Regulation and other matters--Electric utility regulation."

All rate schedules of HECO and its subsidiaries contain energy cost adjustment
clauses as described previously. Under current law and practices, specific and
separate PUC approval is not required for each rate change pursuant to automatic
rate adjustment clauses previously approved by the PUC. Rate increases, other
than pursuant to such automatic adjustment clauses, require the prior approval
of the PUC after public and contested case hearings. PURPA requires the PUC to
periodically review the energy cost adjustment clauses of electric and gas
utilities in the state, and such clauses, as well as the rates charged by the
utilities generally, are subject to change.

See the "Regulation of electric utility rates,"  "Recent rate requests" and
"Energy cost adjustment clauses" sections in HECO's MD&A.

RECENT RATE REQUEST

In March 1998, HELCO filed a request  with the PUC to increase rates 11.5%, or
$17.3 million in annual revenues, based on a 1999 test year and a 12.5% return
on average common equity, primarily to recover the cost of two power generation
projects--an agreement to buy power from Encogen's 60-megawatt plant in Hamakua
and the cost of adding generating units at HELCO's Keahole power plant.  Under
HELCO's request, the portion of the rate increase related to Encogen's
generators would not go into effect until the facilities are completed and
providing electric service to customers.

PUC SHOW CAUSE ORDER

See the "PUC show cause order for HECO" section in Note 12 to HECO's
Consolidated Financial Statements. HECO filed a motion to close the proceeding
in March 1998, based on the fact that the actual returns for 1997--a 10.26%
ROACE and a 8.75% ROR--were below the returns the PUC found to be fair and
reasonable in the last rate proceeding. The Consumer Advocate has filed with the
PUC a statement that it does not oppose HECO's request to close the proceedings.
Management cannot predict what future PUC action, if any, may be taken in this
proceeding.

                                       11
<PAGE>
 
COMPETITION

Legislation has been introduced in Congress that would restructure the electric
utility industry with a view toward increasing competition by, for example,
requiring retail wheeling and allowing customers to choose their generation
supplier. In addition, the PUC has instituted a proceeding to identify and
examine the issues surrounding electric competition and to determine the impact
of competition on the electric utility infrastructure in Hawaii. See the
"Competition" section in HECO's MD&A. In March 1998, the parties agreed to adopt
a collaborative process and schedule whereby they will submit initial position
papers and final position papers to the collaborative group in June 1998 and
September 1998, respectively, and a collaborative report to the PUC by December
1998. A resolution has been introduced in the Hawaii Legislature, which, if
adopted in its current form, would request that the Hawaii Department of
Business, Economic Development, and Tourism examine the impediments to electric
competition in the State of Hawaii and provide specific recommendations to the
Legislature by December 31, 1998, for legislation to expedite the PUC
proceedings on competition in the electric utility industry in Hawaii.
Management cannot predict what changes, if any, may result from these efforts or
any impact they may have on the Company's or HECO's consolidated financial
condition, results of operations or liquidity.

SAVINGS BANK--AMERICAN SAVINGS BANK, F.S.B.
- ---------------------------------------------

GENERAL

ASB was granted a federal savings bank charter in January 1987. Prior to that
time, ASB had operated since 1925 as the Hawaii division of American Savings &
Loan Association of Salt Lake City, Utah. As of December 31, 1997, ASB was the
third largest financial institution in the State of Hawaii with total assets of
$5.5 billion and deposits of $3.9 billion.

HEI agreed with the Office of Thrift Supervision's (OTS) predecessor regulatory
agency that ASB's regulatory capital would be maintained at a level of at least
6% of ASB's total liabilities, or at such greater amount as may be required from
time to time by regulation. Under the agreement, HEI's obligation to contribute
additional capital was limited to a maximum aggregate amount of approximately
$65.1 million. At December 31, 1997, HEI's maximum obligation to contribute
additional capital has been reduced to approximately $28.3 million because of
additional capital contributions of $36.8 million by HEI to ASB since the
acquisition, exclusive of capital contributions made in connection with ASB's
acquisition of most of the Hawaii operations of BoA. ASB is subject to OTS
regulations on dividends and other distributions applicable to financial
institutions regulated by the OTS.

ASB's earnings depend primarily on its net interest income--the difference
between the interest income earned on interest-earning assets (loans receivable,
mortgage-backed securities and investments) and the interest expense incurred on
interest-bearing liabilities (deposit liabilities and borrowings). Deposits
traditionally have been the principal source of ASB's funds for use in lending,
meeting liquidity requirements and making investments. ASB also derives funds
from receipt of interest and principal on outstanding loans receivable,
borrowings from the Federal Home Loan Bank (FHLB) of Seattle, securities sold
under agreements to repurchase and other sources. In recent years, securities
sold under agreements to repurchase and advances from the FHLB of Seattle have
become significant sources of funds.

On September 30, 1996, President Clinton signed into law the Deposit Insurance
Funds Act of 1996, which authorized a one-time deposit-insurance premium
assessment by the Federal Deposit Insurance Corporation (FDIC) of 65.7 cents per
$100 of deposits insured by the Savings Association Insurance Fund (SAIF) and
held as of March 31, 1995. ASB's assessment was $8.3 million after tax and was
accrued in September 1996. The assessment resulted in a reduction of ASB's
deposit-insurance premiums from 23 cents to 6.48 cents per $100 of deposits,
effective January 1, 1997. With the reduction in deposit-insurance premiums,
ASB's annual after-tax savings was approximately $2 million for 1997.

For additional information about ASB, including ASB's acquisition of most of the
Hawaii operations of BoA in December 1997, see the "Savings Bank" sections under
HEI's MD&A and Note 4 to HEI's Consolidated Financial Statements.

                                       12
<PAGE>
 
The following table sets forth selected data for ASB for the years indicated:

<TABLE>
<CAPTION>
                                                                        Years ended December 31,
                                                           -----------------------------------------------
                                                                  1997               1996            1995
- ----------------------------------------------------------------------------------------------------------
<S>                                                           <C>                   <C>             <C>
Common equity to assets ratio
 Average common equity divided by average total assets.....           6.09%           6.21%         6.23%
Return on assets
 Net income divided by average total assets (1)............           0.67 (2)        0.43 (3)      0.71
Return on common equity
 Net income divided by average common equity (1)...........           11.0 (2)         6.8 (3)      11.5
</TABLE>

(1) Net income includes amortization of goodwill and core deposit intangibles.
    Average balances for each year have been calculated using the average
    month-end balances during the year, with the average balances for 1997
    reflecting the effect of the acquisition of most of BoA's Hawaii operations
    on December 6, 1997.

(2) Excluding the BoA - Hawaii one-time acquisition expenses, the return on
    assets and return on common equity ratios would have been 0.70% and 12.1%,
    respectively.

(3) Excluding the FDIC special assessment of $8.3 million after taxes, the
    return on assets and return on common equity ratios would have been 0.70%
    and 10.6%, respectively.

CONSOLIDATED AVERAGE BALANCE SHEET

The following table sets forth average balances of ASB's major balance sheet
categories for the years indicated. Average balances for each year have been
calculated using the average month-end or daily average balances during the
year, with the average balances for 1997 reflecting the effect of the
acquisition of most of BoA's Hawaii operations on December 6, 1997.

<TABLE>
<CAPTION>
                                                                    Years ended December 31,
                                                     ---------------------------------------------------
(in thousands)                                               1997             1996             1995
- --------------------------------------------------------------------------------------------------------
 
ASSETS
<S>                                                     <C>              <C>              <C>
Investment securities................................       $  114,981       $   83,163       $   80,633
Mortgage-backed securities...........................        1,449,570        1,402,165        1,251,192
Loans receivable, net................................        2,143,106        1,868,489        1,751,729
Other................................................          213,124          167,894          173,895
                                                            --------------------------------------------
                                                            $3,920,781       $3,521,711       $3,257,449
                                                            ============================================
<CAPTION>
LIABILITIES AND STOCKHOLDER'S EQUITY
<S>                                                     <C>              <C>              <C>
Deposit liabilities..................................       $2,324,426       $2,210,058       $2,149,229
Other borrowings.....................................        1,261,511        1,023,223          835,310
Other................................................           90,300           69,677           69,903
Stockholder's equity.................................          244,544          218,753          203,007
                                                            --------------------------------------------
                                                            $3,920,781       $3,521,711       $3,257,449
                                                            ============================================
</TABLE>

ASSET/LIABILITY MANAGEMENT

Interest rate sensitivity refers to the relationship between market interest
rates and net interest income resulting from the repricing of interest-earning
assets and interest-bearing liabilities. Interest rate risk arises when an
interest-earning asset matures or when its interest rate changes in a time frame
different from that of the supporting interest-bearing liability. Maintaining an
equilibrium between rate sensitive interest-earning assets and interest-bearing
liabilities will reduce some interest rate risk but it will not guarantee a
stable net interest spread because yields and rates may change simultaneously or
at different times and such changes may occur in differing increments. Market
rate fluctuations could materially affect the overall net interest spread even
if interest-earning assets and interest-bearing liabilities were perfectly
matched. The difference between the amounts of interest-earning assets and
interest-bearing liabilities that reprice during a given period is called "gap."
An asset-sensitive position or "positive gap" exists when more assets than
liabilities reprice within a given period; a liability-sensitive position or
"negative gap" exists when more liabilities than assets reprice within a given
period. A positive gap generally produces more net interest income in periods of
rising interest rates and a negative gap generally produces more net interest
income in periods of falling interest rates.

                                       13
<PAGE>
 
As of December 31, 1997, the gap in the near term (0-6 months) was a negative
7.3% of total assets as compared to a cumulative one-year negative gap position
of 2.1% of total assets. The difference between the near-term and one-year
negative gap positions is primarily due to reduced amounts of repricing of
interest-bearing liabilities such as in short-term certificates of deposits and
other borrowings to support investment activities. The following table shows
ASB's interest rate sensitivity at December 31, 1997:

<TABLE>
<CAPTION>
                                                         Cumulative amounts at December 31, 1997
                                                               subject to repricing within
                                       -----------------------------------------------------------------------
<S>                                       <C>           <C>           <C>            <C>           <C>
                                           6 months      6 months         1-5          Over 5
(dollars in millions)                       or less      to 1 year       years         years       Total (1)
- --------------------------------------------------------------------------------------------------------------
Interest-earning assets
- -----------------------
Real estate loans and mortgage-
 backed securities
 Balloon and adjustable rate.........          $  869        $  828         $  243        $    3        $1,943
 Fixed rate 1-4 unit residential.....             180           153            880         1,090         2,303
 Other...............................              54            35             95            49           233
Consumer and other loans.............             230            11             55            54           350
Commercial loans.....................              44             4             16             8            72
Other interest-earning assets........             122            42             --            --           164
                                          ---------------------------------------------------------------------
Total interest-earning assets........           1,499         1,073          1,289         1,204         5,065
                                          ---------------------------------------------------------------------
Interest-bearing liabilities
- ----------------------------
Certificate accounts.................           1,087           393             238           66         1,784
Money market accounts................              56            47             213           32           348
Negotiable Order of Withdrawal accounts            66            59             334          169           628
Passbook accounts....................             175            67             440          475         1,157
FHLB advances........................             246           105             197          188           736
Other borrowings.....................             274           113              --           --           387
                                          ----------------------------------------------------------------------------
Total interest-bearing liabilities...           1,904           784           1,422          930         5,040
                                          ----------------------------------------------------------------------------
 
 Interest rate sensitivity gap (2)...         $  (405)      $   289         $  (133)       $ 274        $   25
                                          ============================================================================
 
Cumulative interest rate
  sensitivity gap....................         $  (405)      $  (116)        $  (249)       $  25
                                          ============================================================
 
 
Cumulative interest rate sensitivity
  gap over total assets..............           (7.30)%       (2.09)%         (4.49)%       0.45%
- ---------------------------------------------------------------------------------------------------------------------
</TABLE>

(1) The table does not include $483 million of noninterest-earning assets and
    $112 million of noninterest-bearing liabilities.

(2) The difference between the total interest-earning assets and the total
    interest-bearing liabilities.

                                       14
<PAGE>
 
INTEREST INCOME AND INTEREST EXPENSE

The following table sets forth average balances, interest and dividend income,
interest expense and weighted average yields earned and rates paid, for certain
categories of interest-earning assets and interest-bearing liabilities for the
years indicated. Average balances for each year have been calculated using the
average month-end or daily average balances during the year, with the average
balances for 1997 reflecting the effect of the acquisition of most of BoA's
Hawaii operations on December 6, 1997.

<TABLE>
<CAPTION>
                                                                Years ended December 31,
                                              -----------------------------------------------------------
(dollars in thousands)                               1997                 1996                 1995
- ---------------------------------------------------------------------------------------------------------
<S>                                           <C>                  <C>                  <C>
 
Loans
 Average balances..........................          $2,143,106           $1,868,489           $1,751,729
 Interest income...........................          $  174,489           $  155,865           $  146,046
 Weighted average yield....................                8.14%                8.34%                8.34%
 
Mortgage-backed securities
 Average balances..........................          $1,449,570           $1,402,165           $1,251,192
 Interest income...........................          $   95,990           $   94,561           $   85,727
 Weighted average yield....................                6.62%                6.74%                6.85%
 
Investments (1)
 Average balances..........................          $  114,981           $   83,163           $   80,633
 Interest and dividend income..............          $    7,139           $    5,288           $    4,921
 Weighted average yield....................                6.21%                6.36%                6.10%

Total interest-earning assets
 Average balances..........................          $3,707,657           $3,353,817           $3,083,554
 Interest and dividend income..............          $  277,618           $  255,714           $  236,694
 Weighted average yield....................                7.49%                7.62%                7.68%
 
Deposits
 Average balances..........................          $2,324,426           $2,210,058           $2,149,229
 Interest expense..........................          $   89,099           $   91,164           $   89,296
 Weighted average rate.....................                3.83%                4.12%                4.15%
 
Borrowings
 Average balances..........................          $1,261,511           $1,023,223           $  835,310
 Interest expense..........................          $   75,563           $   62,500           $   53,409
 Weighted average rate.....................                5.99%                6.11%                6.39%
 
Total interest-bearing liabilities
 Average balances..........................          $3,585,937           $3,233,281           $2,984,539
 Interest expense..........................          $  164,662           $  153,664           $  142,705
 Weighted average rate.....................                4.59%                4.75%                4.78%
 
Net balance, net interest income
 and interest rate spread
  Net balance..............................          $  121,720           $  120,536           $   99,015
  Net interest income......................          $  112,956           $  102,050           $   93,989
  Interest rate spread.....................                2.90%                2.87%                2.90%
</TABLE>

(1)  Investments include stock in the Federal Home Loan Bank of Seattle.

                                       15
<PAGE>
 
The following table shows the effect on net interest income of (1) changes in
interest rates (change in weighted average interest rate multiplied by prior
year average portfolio balance) and (2) changes in volume (change in average
portfolio balance multiplied by prior period rate). Any remaining change is
allocated to the above two categories on a pro rata basis.

<TABLE>
<CAPTION>
                                                                       Increase (decrease) due to
                                                           ----------------------------------------------
(in thousands)                                                    Rate           Volume          Total
- ---------------------------------------------------------------------------------------------------------
<S>                                                              <C>             <C>             <C> 
Year ended December 31, 1997 vs. 1996
- -----------------------------------------------------------
Income from interest-earning assets
 Loan portfolio............................................        $(3,813)        $22,437        $18,624
 Mortgage-backed securities................................         (1,712)          3,141          1,429
 Investments...............................................           (128)          1,979          1,851
                                                                   --------------------------------------
                                                                    (5,653)         27,557         21,904
                                                                   --------------------------------------
Expense from interest-bearing liabilities
 Deposits..................................................         (6,622)          4,557         (2,065)
 FHLB advances and other borrowings........................         (1,249)         14,312         13,063
                                                                   --------------------------------------
                                                                    (7,871)         18,869         10,998
                                                                   --------------------------------------
Net interest income........................................        $ 2,218         $ 8,688        $10,906
                                                                   ======================================
</TABLE>

<TABLE>
<CAPTION>
<S>                                                           <C>            <C>             <C> 
Year ended December 31, 1996 vs. 1995
- -----------------------------------------------------------
Income from interest-earning assets
 Loan portfolio............................................      $    --           $ 9,819        $ 9,819
 Mortgage-backed securities................................       (1,391)           10,225          8,834
 Investments...............................................          212               155            367
                                                                 ----------------------------------------
                                                                  (1,179)           20,199         19,020
                                                                 ----------------------------------------
Expense from interest-bearing liabilities
 Deposits..................................................         (647)            2,515          1,868
 FHLB advances and other borrowings........................       (2,434)           11,525          9,091
                                                                 ----------------------------------------
                                                                  (3,081)           14,040         10,959
                                                                 ----------------------------------------
Net interest income........................................      $ 1,902           $ 6,159        $ 8,061
                                                                 ========================================
</TABLE>

OTHER INCOME

In addition to net interest income, ASB has various sources of other income,
including fee income from servicing loans, fees on deposit accounts, rental
income from premises and other income. Other income totaled approximately
$16.5 million in 1997, $15.7 million in 1996 and $17.9 million in 1995. The
decrease in other income during 1996 was primarily due to a $3.9 million one-
time gain on sale of trading account securities in 1995. Excluding the one-time
gain on sale of approximately $49.5 million of trading account securities in
1995, other income for 1996 increased $1.7 million over 1995 due to increases in
fee income from servicing loans.

LENDING ACTIVITIES

General.  ASB's net loan and mortgage-backed securities portfolio increased to
approximately $4.9 billion at December 31, 1997 primarily due to the purchase of
$0.9 billion of Hawaii-based BoA loans and the purchase, primarily in
anticipation of the BoA acquisition, of $0.8 billion in mortgage-backed
securities. Loans and mortgage-backed securities represent 88.3% of total assets
at December 31, 1997, compared to $3.3 billion, or 93.1%, and $3.1 billion, or
91.8%, at December 31, 1996 and 1995, respectively. ASB's loan portfolio
consists primarily of conventional residential mortgage loans which are not
insured by the Federal Housing Administration or guaranteed by the Veterans
Administration.

                                       16
<PAGE>
 
The following tables set forth the composition of ASB's loan and mortgage-backed
securities portfolio:

<TABLE>
<CAPTION>
                                                                          December 31,
                               -------------------------------------------------------------------------------------------
                                               1997                         1996                           1995
                               -------------------------------------------------------------------------------------------
(dollars in thousands)                 Balance     % of total       Balance       % of total       Balance      % of total
- --------------------------------------------------------------------------------------------------------------------------
<S>                               <C>                   <C>            <C>              <C>            <C>              <C>
Real estate loans (1)
Conventional...................      $2,631,298       53.69%      $1,800,365         53.87%      $1,495,955         47.75%
Construction and development...          32,569        0.67           29,964          0.89           29,650          0.95
                                 ----------------------------------------------------------------------------------------
                                      2,663,867       54.36        1,830,329         54.76        1,525,605         48.70
Less
 Deferred fees and discounts....        (16,055)      (0.33)         (17,759)        (0.53)         (15,244)        (0.49)
 Undisbursed loan funds.........        (13,724)      (0.28)         (14,532)        (0.43)         (10,422)        (0.33)
 Allowance for losses...........        (20,450)      (0.42)         (15,792)        (0.47)         (10,837)        (0.34)
                                 ----------------------------------------------------------------------------------------
Total real estate loans, net...       2,613,638       53.33        1,782,246         53.33        1,489,102         47.54
                                 ----------------------------------------------------------------------------------------
Other loans
Loans on deposits..............          17,473        0.36           15,441          0.46           15,688          0.50
Consumer and other loans.......         342,146        6.98          192,315          5.75          170,743          5.45
Commercial loans...............          88,315        1.80           18,548          0.56           20,560          0.66
                                 ----------------------------------------------------------------------------------------
                                        447,934        9.14          226,304          6.77          206,991          6.61
Less
 Deferred fees and discounts....            (14)      (0.00)             (23)        (0.00)             (38)        (0.00)
 Undisbursed loan funds.........        (16,211)      (0.33)          (3,086)        (0.09)          (6,175)        (0.20)
 Allowance for losses...........         (9,500)      (0.19)          (3,413)        (0.10)          (2,079)        (0.07)
                                 ----------------------------------------------------------------------------------------
Total other loans, net.........         422,209        8.62          219,782          6.58          198,699          6.34
                                 ----------------------------------------------------------------------------------------

Mortgage-backed securities,
 net of discounts..............       1,865,027       38.05        1,340,073         40.09        1,444,832         46.12
                                 ----------------------------------------------------------------------------------------
 Total loans and
  mortgage-backed securities,
  net..........................      $4,900,874      100.00%      $3,342,101        100.00%      $3,132,633        100.00%
                                 =========================================================================================
</TABLE>

(1)  Includes renegotiated loans.

                                       17
<PAGE>
 
<TABLE>
<CAPTION>
                                                                                        December 31,
                                                        --------------------------------------------------------------
                                                                   1994                                       1993
                                                        --------------------------------------------------------------
(dollars in thousands)                                  Balance       % of total             Balance        % of total
- ----------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>              <C>                 <C>                <C> 
Real estate loans (1)
Conventional.....................................       $1,657,935         57.34%            $1,587,615          67.12%
Construction and development.....................           36,184          1.25                 26,526           1.12
                                                        --------------------------------------------------------------
                                                         1,694,119         58.59              1,614,141          68.24
Less
 Deferred fees and discounts.....................          (21,159)        (0.73)               (26,728)         (1.13)
 Undisbursed loan funds..........................          (16,056)        (0.56)               (13,142)         (0.55)
 Allowance for losses............................           (7,259)        (0.25)                (3,962)         (0.17)
                                                        --------------------------------------------------------------
Total real estate loans, net.....................        1,649,645         57.05              1,570,309          66.39
                                                        --------------------------------------------------------------
 
Other loans
Loans on deposits................................           15,378          0.53                 15,015           0.63
Consumer and other loans.........................          144,505          5.00                129,961           5.49
Commercial loans.................................           18,369          0.64                 24,494           1.04
                                                        --------------------------------------------------------------
                                                           178,252          6.17                169,470           7.16
Less
 Deferred fees and discounts.....................              (52)        (0.00)                  (156)         (0.01)
 Undisbursed loan funds..........................           (2,256)        (0.08)                (3,173)         (0.13)
 Allowance for losses............................           (1,534)        (0.05)                (1,352)         (0.06)
                                                        --------------------------------------------------------------
Total other loans, net...........................          174,410          6.04                164,789           6.96
                                                        --------------------------------------------------------------

Mortgage-backed securities, net of discounts.....        1,067,287         36.91                630,156          26.65
                                                        --------------------------------------------------------------
 Total loans and mortgage-backed
    securities, net..............................       $2,891,342        100.00%            $2,365,254         100.00%
                                                        ==============================================================
</TABLE>

(1)  Includes renegotiated loans.

Origination, purchase and sale of loans.  Generally, loans originated and
purchased by ASB are secured by real estate located in Hawaii. As of
December 31, 1997, approximately $84.3 million of loans purchased from other
lenders were secured by properties located in the continental United States. For
additional information, including information concerning the geographic
distribution of ASB's mortgage-backed securities portfolio and the geographic
concentration of credit risk, see Note 19 to HEI's Consolidated Financial
Statements.

The amount of loans originated during 1997, 1996, 1995, 1994 and 1993 were
$327 million, $498 million, $382 million, $523 million and $564 million,
respectively. The decreases in loans originated in 1997 from 1996, in 1995 from
1994 and in 1994 from 1993 were due in part to the slow Hawaii real estate
market. The increase in loans originated in 1996 from 1995 was due primarily to
higher refinancings of residential mortgage loans from other financial
institutions.

Residential mortgage lending.  During 1997 and 1996 the demand for adjustable
rate mortgage (ARM) loans over fixed rate loans decreased compared with 1995.
ARM loans carry adjustable interest rates which are typically set according to a
short-term index. Payment amounts may be adjusted periodically based on changes
in interest rates. ARM loans represented approximately 7.7% of the total
originations of first mortgage loans in 1997, compared to 12.6% and 27.7% in
1996 and 1995, respectively. ASB intends to continue to emphasize the
origination and purchase of ARM loans to further improve its asset/liability
structure.

ASB is permitted to lend up to 100% of the appraised value of the real property
securing a loan. Its general policy is to require private mortgage insurance
when the loan-to-value ratio of the property exceeds 80% of the lower of the
appraised value or purchase price at origination. For nonowner-occupied
residential properties, the loan-to-value ratio may not exceed 90% of the lower
of the appraised value or purchase price at origination.

                                       18
<PAGE>
 
Construction and development lending.  ASB provides both fixed and adjustable
rate loans for the construction of one-to-four residential unit and commercial
properties. Construction and development financing generally involves a higher
degree of credit risk than long-term financing on improved, occupied real
estate. Accordingly, all construction and development loans are priced higher
than loans secured by completed structures. ASB's underwriting, monitoring and
disbursement practices with respect to construction and development financing
are designed to ensure sufficient funds are available to complete construction
projects. As of December 31, 1997, 1996 and 1995, construction and development
loans represented 1.0%, 1.5% and 1.2%, respectively, of ASB's gross loan
portfolio. See "Loan portfolio risk elements."

Multi-family residential and commercial real estate lending.  Permanent loans
secured by multi-family properties (generally apartment buildings), as well as
commercial and industrial properties (including office buildings, shopping
centers and warehouses), are originated by ASB for its own portfolio as well as
for participation with other lenders. In 1997, 1996 and 1995, loans on these
types of properties accounted for approximately 2.7%, 3.2% and 5.9%,
respectively, of ASB's total mortgage loan originations. The objective of
commercial real estate lending is to diversify ASB's loan portfolio to include
sound, income-producing properties.

Consumer lending.  ASB offers a variety of secured and unsecured consumer loans.
Loans secured by deposits are limited to 90% of the available account balance.
ASB also offers VISA cards, automobile loans, general purpose consumer loans,
second mortgage loans, home equity lines of credit, checking account overdraft
protection and unsecured lines of credit. In 1997, 1996 and 1995, loans of these
types accounted for approximately 9.0%, 8.0% and 11.5%, respectively, of ASB's
total loan originations.

Corporate banking/commercial lending.  ASB is authorized to make both secured
and unsecured corporate banking loans to business entities. This lending
activity is designed to diversify ASB's asset structure, shorten maturities,
provide rate sensitivity to the loan portfolio and attract business checking
deposits. ASB acquired $56.9 million of corporate banking loans from BoA. As of
December 31, 1997, 1996 and 1995, corporate banking loans represented 2.8%, 0.8%
and 0.9%, respectively, of ASB's total net loan portfolio.

Loan origination fee and servicing income.  In addition to interest earned on
loans, ASB receives income from servicing of loans, for late payments and from
other related services. Servicing fees are received on loans originated and
subsequently sold by ASB through a securitization process and also on loans for
which ASB acts as collection agent on behalf of third-party purchasers. ASB
acquired the servicing rights for approximately $305 million of residential
loans from BoA.

ASB generally charges the borrower at loan settlement a loan origination fee
ranging from 2% to 3% of the amount borrowed. See the "Loan origination and
commitment fees" section in Note 1 to HEI's Consolidated Financial Statements.

Loan portfolio risk elements. When a borrower fails to make a required payment
on a loan and does not cure the delinquency promptly, the loan is classified as
delinquent. If delinquencies are not cured promptly, ASB normally commences a
collection action, including foreclosure proceedings in the case of secured
loans. In a foreclosure action, the property securing the delinquent debt is
sold at a public auction in which ASB may participate as a bidder to protect its
interest. If ASB is the successful bidder, the property is classified in a real
estate owned account until it is sold. ASB's real estate acquired in settlement
of loans represented 0.07% of total assets at December 31, 1997 and 1996 and
0.08% of total assets at December 31, 1995.

In addition to delinquent loans, other significant lending risk elements
include: (1) accruing loans which are over 90 days past due as to principal or
interest, (2) loans accounted for on a nonaccrual basis (nonaccrual loans), and
(3) loans on which various concessions are made with respect to interest rate,
maturity, or other terms due to the inability of the borrower to service the
obligation under the original terms of the agreement (renegotiated loans). ASB
has no loans which are over 90 days past due on which interest is being accrued
for the years presented in the table below. The level of nonaccrual and
renegotiated loans represented 2.4%, 2.5%, 1.7%, 1.4% and 0.5%, of ASB's total
net loans outstanding

                                       19
<PAGE>
 
at December 31, 1997, 1996, 1995, 1994 and 1993, respectively. The following
table sets forth certain information with respect to nonaccrual and renegotiated
loans as of the dates indicated:

<TABLE>
<CAPTION>
                                                                      December 31,
                                          -----------------------------------------------------------------
(in thousands)                                  1997         1996         1995         1994         1993
- -----------------------------------------------------------------------------------------------------------
<S>                                          <C>          <C>          <C>          <C>          <C>
Nonaccrual loans-
Real estate
 1-4 unit residential.....................      $36,643      $23,585      $11,533      $ 8,773       $5,006
 Income property..........................       29,955       19,832       13,820       14,224          220
                                          ----------------------------------------------------------------- 
Total real estate.........................       66,598       43,417       25,353       22,997        5,226
Commercial................................          776          937           11           25           38
Consumer..................................        4,435        2,701        1,702          793          460
                                          -----------------------------------------------------------------
Total nonaccrual loans....................      $71,809      $47,055      $27,066      $23,815       $5,724
                                          =================================================================
 
Renegotiated loans not included above-
Real estate
 1-4 unit residential.....................      $ 2,264      $ 3,211      $ 1,053      $ 1,004       $  381
 Income property..........................           --           --           --           --        1,486
 Commercial...............................           --           --           --           --          324
                                          -----------------------------------------------------------------
Total renegotiated loans..................      $ 2,264      $ 3,211      $ 1,053      $ 1,004       $2,191
                                          =================================================================
</TABLE>

ASB's policy generally is to place mortgage loans on a nonaccrual status
(interest accrual is suspended) when the loan becomes more than 90 days past due
or on an earlier basis when there is a reasonable doubt as to its
collectability. Loans on nonaccrual status amounted to $71.8 million (2.3% of
total loans), $47.1 million (2.3% of total loans), $27.1 million (1.6% of total
loans), $23.8 million (1.3% of total loans) and $5.7 million (0.3% of total
loans) at December 31, 1997, 1996, 1995, 1994 and 1993, respectively.

Since 1994, the increases in nonaccrual loans were a result of Hawaii's weak
economy. In 1994, a rising trend of delinquencies resulted in a $3.8 million
increase in nonaccrual residential loans, and the $14.0 million increase in
nonaccrual income property loans was primarily due to three commercial real
estate loans with principal balances totaling $11.8 million that were
renegotiated. In 1996, the $20.0 million increase in nonaccrual real estate
loans can be attributed primarily to a single real estate developer with
residential, commercial real estate and commercial loans totaling approximately
$16.5 million that were restructured during 1996. In 1997, the $24.7 million
increase in nonaccrual loans includes a $13.1 million increase in smaller
balance residential loans and a $10.1 million increase in income property real
estate loans.

Allowance for loan losses.  The provision for loan losses is dependent upon
management's evaluation as to the amount required to maintain the allowance for
loan losses at a level considered appropriate in relation to the risk of future
losses inherent in the loan portfolio. While management attempts to use the best
information available to make evaluations, future adjustments may be necessary
as circumstances change and additional information becomes available.

                                       20
<PAGE>
 
The following table presents the changes in the allowance for loan losses for
the years indicated.

<TABLE>
<CAPTION>
                                                                         Years ended December 31,
                                                    ----------------------------------------------------------------
(dollars in thousands)                                 1997          1996          1995          1994          1993
- --------------------------------------------------------------------------------------------------------------------
 
<S>                                              <C>           <C>           <C>           <C>           <C>
Allowance for loan losses, beginning of year......  $19,205       $12,916       $ 8,793        $5,314         $5,157  
                                                                                                                      
Additions to provisions for losses................    6,934         7,631         4,887         3,983            779  
Allowance for losses on loans acquired from BoA...    6,445            --            --            --             --  
 
NET CHARGE-OFFS
Real estate loans.................................      992           390            69           109             --
Other loans.......................................    1,642           952           695           395            622
                                                    ----------------------------------------------------------------
Total net charge-offs.............................    2,634         1,342           764           504            622
                                                    ----------------------------------------------------------------
 
Allowance for loan losses, end of year............  $29,950       $19,205       $12,916        $8,793         $5,314
                                                    ================================================================
 
Ratio of net charge-offs during the year to
 average loans outstanding....................         0.12%         0.07%         0.04%         0.03%          0.04%
                                              ======================================================================
</TABLE>

ASB's ratio of provisions for loan losses during the year to average loans
outstanding was 0.32%, 0.41%, 0.28%, 0.21% and 0.05% for the years ended
December 31, 1997, 1996, 1995, 1994 and 1993, respectively. In 1997, a
nonspecific allowance for loan losses amounting to approximately $6.4 million
was recorded in assigning acquisition cost to the loans receivable acquired from
BoA. In 1997, 1996 and 1995, to establish additional specific loss allowances
and in response to a rising trend of delinquencies caused by Hawaii's weak
economy, ASB increased its loss reserve by $4.3 million, $6.3 million and $4.1
million, respectively.

INVESTMENT ACTIVITIES

In recent years, ASB's investment portfolio has consisted primarily of stock of
the FHLB of Seattle, federal agency obligations and mortgage-backed securities.
In response to the then increasing interest rate environment, management decided
in 1994 to liquidate ASB's portfolio of securities held for trading and the
liquidation was completed in October 1994. ASB recognized a one-time gain on
sale of trading account securities in 1995 in accordance with implementation
guidance provided in a FASB special report. ASB did not maintain a portfolio of
securities held for trading during 1996 or 1997.

ASB's investment portfolio, excluding mortgage-backed securities to be held-to-
maturity, consisted of a $42.1 million investment in U.S. Treasury securities
and a $63.5 million investment in FHLB stock as of December 31, 1997. Investment
in FHLB stock amounted to $37.5 million and $34.7 million as of December 31,
1996 and 1995, respectively. The weighted average rate on investments during
1997, 1996 and 1995 was 7.57%, 7.80% and 6.03%, respectively. The amount that
ASB invests in FHLB stock is determined by regulatory requirements. See
"Regulation and other matters--Savings bank regulation--Federal Home Loan Bank
System."

DEPOSITS AND OTHER SOURCES OF FUNDS

General.  Deposits traditionally have been the principal source of ASB's funds
for use in lending, meeting liquidity requirements and making investments. ASB
also derives funds from receipt of interest and principal on outstanding loans
receivable and mortgage-backed securities, borrowings from the FHLB of Seattle,
securities sold under agreements to repurchase and other sources. ASB borrows on
a short-term basis to compensate for seasonal or other reductions in deposit
flows. ASB also may borrow on a longer-term basis to support expanded lending or
investment activities. In the last few years, securities sold under agreements
to repurchase and advances from the FHLB have become significant
sources of funds as the demand for deposits has decreased. Using higher cost
sources of funds puts downward pressure on ASB's net interest income.

Deposits.  ASB's deposits are obtained primarily from residents of Hawaii. In
1997, ASB had average deposits of $2.3 billion, with a net savings inflow of
$21.9 million, excluding interest credited to deposit accounts and excluding
$1.7 billion in deposits assumed from BoA. The net savings outflow for 1996 of
$152 million was due to competition from the equity market and management's
decision not to pursue high-priced certificates of deposits. In 1995, ASB had
average deposits of $2.1 billion, with a net 

                                       21
<PAGE>
 
savings inflow of $15 million, excluding interest credited to deposit accounts.
In the three years ended December 31, 1997, ASB had no deposits placed by or
through a broker.

The following table illustrates the distribution of ASB's average deposits and
average daily rates by type of deposit for the years indicated. Average balances
for a year have been calculated using the average of month-end balances during
the year, with the average balances for 1997 reflecting the effect of the
acquisition of most of BoA's Hawaii operations on December 6, 1997.

<TABLE>
<CAPTION>
                                                                   Years ended December 31,
                     -------------------------------------------------------------------------------------------------------------
                                          1997                         1996                                1995
                     -------------------------------------------------------------------------------------------------------------
                                        % of        Weighted                 % of      Weighted                % of      Weighted
                             Average     total      average     Average      total      average     Average     total     average
(dollars in thousands)       balance   deposits      rate %     balance     deposits     rate %     balance    deposits    rate %
 ---------------------------------------------------------------------------------------------------------------------------------
 
<S>                     <C>               <C>       <C>       <C>             <C>       <C>       <C>             <C>      <C> 
Passbook accounts....... $  899,368       38.7%      2.98%    $  922,129        41.7%    3.41%    $  978,858     45.5%      3.48%
Negotiable Order of                                                                                                      
 Withdrawal accounts....    305,626       13.2       1.19        271,696        12.3     1.60        264,996     12.4       2.09
                                                                                                                         
Money market accounts...     93,425        4.0       3.76         65,494         3.0     3.51         66,634      3.1       3.43
Certificate accounts....  1,026,007       44.1       5.38        950,739        43.0     5.59        838,741     39.0       5.66
                         -------------------------------------------------------------------------------------------------------
 Total deposits......... $2,324,426      100.0%      3.83%    $2,210,058       100.0%    4.12%    $2,149,229    100.0%      4.15%
                         ==========================================================================================================

At December 31, 1997, ASB had $741 million in certificate accounts of $100,000 or more, maturing as follows:

<CAPTION>
(in thousands)                                                                       Amount
- -----------------------------------------------------------------------------------------------
<S>                                                                              <C>
Three months or less..........................................................         $373,741
Greater than three months through six months..................................          217,072
Greater than six months through twelve months.................................           94,704
Greater than twelve months....................................................           55,187
                                                                                       --------
                                                                                       $740,704
                                                                                       ========
</TABLE>

Borrowings.  ASB obtains advances from the FHLB of Seattle provided certain
standards related to creditworthiness have been met. Advances are secured under
a blanket pledge of the common stock ASB owns in the FHLB, mortgage-backed
securities and certain notes held by ASB and the mortgages securing them. FHLB
advances generally are available to meet seasonal and other withdrawals of
deposit accounts, to expand lending and to assist in the effort to improve asset
and liability management. FHLB advances are made pursuant to several different
credit programs offered from time to time by the FHLB of Seattle.

At December 31, 1997, 1996 and 1995, advances from the FHLB amounted to
$736 million, $684 million and $501 million, respectively. The weighted average
rates on the advances from the FHLB outstanding at December 31, 1997, 1996 and
1995 were 6.26%, 6.42% and 6.52%, respectively. The maximum amount outstanding
at any month-end during 1997, 1996 and 1995 was $941 million, $691 million and
$618 million, respectively. Advances from the FHLB averaged $701 million,
$560 million and $559 million during 1997, 1996 and 1995, respectively, and the
approximate weighted average rate thereon was 6.32%, 6.49% and 6.55%,
respectively. During 1995, advances decreased as securities sold under
agreements to repurchase provided a lower cost funding source. During 1996, the
increase in advances supported investment activities as management decided not
to pursue high-priced certificates of deposits. During 1997, increased advances
from the FHLB were needed to support investment activities.  In anticipation of
the BoA acquisition, ASB acquired approximately $0.8 billion in mortgage-backed
securities which were temporarily funded in part by advances from the FHLB.

At December 31, 1997 and 1996, securities sold under agreements to repurchase
consisted of mortgage-backed securities sold to brokers/dealers under fixed-
coupon agreements. The agreements are treated as financings and the obligations
to repurchase securities sold are reflected as a liability in the consolidated
balance sheets. The dollar amount of securities underlying the agreements
remains in the asset accounts. At December 31, 1997, 1996 and 1995, $375 million
(including accrued interest of $0.9 million), $480 million (including accrued
interest of $1.6 million) and $413 million (including accrued interest of
$2.5 million) of the agreements were to repurchase identical securities,
respectively. The weighted average rates on securities sold under agreements to
repurchase outstanding at December 31, 1997, 1996 

                                       22
<PAGE>
 
and 1995 were 5.71%, 5.50% and 5.84%, respectively. The maximum amount
outstanding at any month-end during 1997, 1996 and 1995 was $765 million,
$480 million and $413 million, respectively. Securities sold under agreements to
repurchase averaged $560 million, $463 million and $277 million during 1997,
1996 and 1995, respectively, and the approximate weighted average interest rate
thereon was 5.58%, 5.65% and 6.08%, respectively. During 1997, increased
securities sold under agreements to repurchase were needed to temporarily fund
the purchase of mortgage-backed and investment securities in anticipation of the
BoA acquisition. During 1996 and 1995, increased securities sold under
agreements to repurchase were needed to support investment activities as the
demand for deposits decreased.

Other borrowings as of December 31, 1997 represents cash management repurchase
transactions. ASB sweeps selected commercial customers' excess deposit balances
into an overnight repurchase transaction.

Subject to obtaining certain approvals from the FHLB of Seattle, ASB may offer
collateralized medium-term notes due from nine months to 30 years from the date
of issue and bearing interest at a fixed or floating rate established at the
time of issue. At December 31, 1997, 1996 and 1995, ASB had no outstanding
collateralized medium-term notes.

The following table sets forth information concerning ASB's advances from FHLB
and other borrowings at the dates indicated:

<TABLE>
<CAPTION>
                                                                            December 31,
                                                      -----------------------------------------------------
(dollars in thousands)                                        1997              1996              1995
- -----------------------------------------------------------------------------------------------------------
 
<S>                                                      <C>               <C>               <C>
Advances from FHLB....................................       $  736,474        $  684,274          $501,274
Securities sold under agreements to repurchase........          375,366           479,742           412,521
Other borrowings......................................           11,326                --                --
                                                      -----------------------------------------------------
Total borrowings......................................       $1,123,166        $1,164,016          $913,795
                                                      =====================================================
  
Weighted average rate.................................             6.06%             6.04%             6.21%
                                                      =====================================================
</TABLE>

COMPETITION

The primary factors in competing for deposits are interest rates, the quality
and range of services offered, marketing, convenience of locations, hours and
perceptions of the institution's financial soundness and safety. Competition for
deposits comes primarily from other savings institutions, commercial banks,
credit unions, money market and mutual funds and other investment alternatives.
In Hawaii, there were 3 thrifts, 16 FDIC-insured banks and 117 credit unions at
December 31, 1997. Additional competition for deposits comes from various types
of corporate and government borrowers, including insurance companies. To meet
the competition, ASB offers a variety of savings and checking accounts at
competitive rates, convenient business hours, convenient branch locations with
interbranch deposit and withdrawal privileges at each branch and approximately
150 convenient automated teller machines. ASB also conducts advertising and
promotional campaigns.

The primary factors in competing for first mortgage and other loans are interest
rates, loan origination fees and the quality and range of lending services
offered. Competition for origination of first mortgage loans comes primarily
from other savings institutions, mortgage banking firms, commercial banks,
insurance companies and real estate investment trusts. ASB believes that it is
able to compete for such loans primarily through the interest rates and loan
fees it charges, the type of mortgage loan programs it offers and the efficiency
and quality of the services it provides its borrowers and the real estate
business community.

In recent years, there's been significant bank and thrift merger activity in
Hawaii. Management cannot predict the impact, if any, of these mergers on the
Company's future competitive position, results of operations, financial
condition or liquidity.

Recent Supreme Court ruling.  The 1934 Federal Credit Union Act says membership
"shall be limited to groups having a common bond of occupation or association"
or to groups in a well-defined geographical area. In 1982, the National Credit
Union Administration expanded its definition of "common bond." Small businesses
that lacked enough workers to form their own credit unions were allowed to join
existing credit unions, so long as each group of employees had its own "bond."
Government officials say 

                                       23
<PAGE>

that rule has let credit unions add about 15 million people to their membership
rolls. A group of North Carolina banks and the American Bankers Association sued
the government, saying the 1934 law required all members of a credit union to
share a single common bond. A federal appeals court ruled in the bankers' favor
in July 1997, and the Supreme Court ruled in the bankers' favor in February
1998. Although this ruling could result in increased deposits for ASB,
legislation has been proposed in Congress to retroactively authorize such
expansions in credit union membership.

OTHER
- -----

FREIGHT TRANSPORTATION -- HAWAIIAN TUG & BARGE CORP. AND YOUNG BROTHERS, LIMITED
- --------------------------------------------------------------------------------

GENERAL

HTB and its wholly owned subsidiary, YB, were acquired in 1986. A substantial
portion of the state's commodities are imported. HTB provides marine
transportation services in Hawaii and the Pacific area, including charter tug
and barge and harbor tug operations. YB, which is a regulated interisland cargo
carrier, transports general freight and containerized cargo by barge on a
regular schedule between all major ports in Hawaii. YB moved 3.5 million revenue
tons of cargo between the islands in 1997, compared to 3.3 million revenue tons
in 1996.

YB has a nonexclusive Certificate of Public Convenience and Necessity from the
PUC to operate as an intrastate common carrier by water. The Certificate will
remain in effect for an indefinite period unless suspended or terminated by the
PUC. YB encounters competition from, among others, interstate carriers and
unregulated contract carriers.

YB RATES

YB generally must accept for transport all cargo offered. YB rates and charges
must be approved by the PUC and the PUC has broad discretion in its regulation
of the rates charged by YB.

See the "Other" section of HEI's MD&A for additional information about YB's rate
increases.

REAL ESTATE--MALAMA PACIFIC CORP.
- --------------------------------

GENERAL

MPC was incorporated in 1985 and engages in real estate development activities,
both directly and through joint ventures.

MPC's real estate development investments and residential projects are targeted
for Hawaii's owner-occupant market. MPC is currently involved in the development
of four residential projects (Kua' Aina Ridge, Westhills at Makakilo Heights,
Piilani Village Phase 1 and Sunrise Estates) on approximately 268 acres of land
on the islands of Oahu, Maui and Hawaii encompassing approximately 450 homes or
lots, of which approximately 375 have been completed and sold. MPC and its joint
ventures own approximately 424 acres of land for future residential development.

Residential development generally requires a long lead time to obtain necessary
zoning changes, building permits and other required approvals. MPC's projects
are subject to the usual risks of real estate development, including
fluctuations in interest rates, the receipt of timely and appropriate state and
local zoning and other necessary approvals, possible cost overruns and
construction delays, adverse changes in general commerce and local market
conditions, compliance with applicable environmental and other regulations, and
potential competition from other new projects and resales of existing
residences.

JOINT VENTURE DEVELOPMENTS

Sunrise Estates.  In 1990, MDC and HSC, Inc. formed Sunrise Estates Joint
Venture to develop and sell 165 one-acre house lots in Hilo, Hawaii (island of
Hawaii). Through 1993, sales of 156 lots closed. Subdivision approval for the
remaining nine lots was received in 1995. In 1996 and 1997, sales of five lots
closed.

In 1991, HSC, Inc. and Malama Elua Corp., a wholly owned subsidiary of MPC,
formed Sunrise Estates II Joint Venture to develop and sell approximately 146
one-acre house lots in Hilo, Hawaii, adjacent to the Sunrise Estates Joint
Venture project. Rezoning was completed in 1993 and the joint venture has
submitted the subdivision map for approval.

Baldwin*Malama.  In 1990, MDC acquired a 50% general partnership interest in
Baldwin*Malama, a partnership with Baldwin Pacific Properties, Inc. (BPPI),
established to acquire approximately 172 acres 

                                       24
<PAGE>
 
of land for potential development of about 780 single and multi-family
residential units in Kihei on the island of Maui. In 1994, the project received
approval to increase density to approximately 1,000 units. The first phase of
100 single family units is complete, and as of December 31, 1997, 99 units were
sold.

In May 1993, Baldwin*Malama was reorganized as a limited partnership in which
MDC is the sole general partner and BPPI is the sole limited partner. Beginning
in May 1993, MDC consolidated the accounts of Baldwin*Malama. Previously, MDC
accounted for its investment in Baldwin*Malama under the equity method. In
conjunction with the dissolution of the Baldwin*Malama general partnership and
formation of the limited partnership, MPC agreed to loan $1.6 million to BPPI
and up to $15 million to the limited partnership. Through 1997, MPC agreed to
increase the maximum loan amount to Baldwin*Malama up to $39.0 million. As of
December 31, 1997, the outstanding balances on MPC's loans to BPPI and
Baldwin*Malama were $0.8 million and $25.1 million, respectively.

Palailai Associates.  Malama Mohala Corp. (MMO) owns a 50% interest in Palailai
Associates. In 1993, Palailai Associates completed the development and sale of
the first increment of 107 homes and lots and completed the bulk sale of its
38.8 acres of multi-family zoned land in Makakilo, Oahu. The second increment of
69 single family homes is also completed and sold. The third increment of 100
single family homes is in progress with 73 homes completed and sold as of
December 31, 1997. Palailai Associates owns approximately 47 acres of adjacent
land zoned for residential development.

MMO PROJECTS

Kipona Hills is a 66-unit subdivision located in Waikoloa on the island of
Hawaii. As of December 31, 1996, all homes or lots were completed and sold.

Kua' Aina Ridge is a 92-lot subdivision in Pukalani, Maui. Sales closings
commenced in 1993. As of December 31, 1997, 41 homes or lots were available for
sale.

Kehaulani Place, consisting of approximately 51 acres of land in Pukalani, Maui,
is currently zoned for agriculture. Rezoning and land-use reclassification will
be required before development can commence. Land planning and presentations to
local community groups commenced in 1993 and are ongoing.

PROJECT FINANCING

At December 31, 1997, MPC or its subsidiaries were directly liable for
$10.0 million of outstanding loans and had additional loan facilities of
$0.8 million. See the "Commitments and contingencies" section in Note 5 to HEI's
Consolidated Financial Statements. MPC or its subsidiaries may enter into
additional commitments in connection with the financing of future phases of
development of MPC's projects and HEI may enter into similar agreements
regarding the ownership and financial condition of MPC.

HEI INVESTMENT CORP.
- --------------------

HEIIC was incorporated in May 1984 primarily to make passive, tax-advantaged
investments in corporate securities and other long-term investments. HEIIC is
not an "investment company" under the Investment Company Act of 1940 and has no
direct employees.

HEIIC's long-term investments consist primarily of investments in leveraged
leases. HEIIC has a 15% ownership interest in an 818-MW coal-fired generating
unit in Georgia, which is subject to a leveraged lease agreement. In 1987, HEIIC
purchased commercial buildings on leasehold properties located in the
continental United States, along with the related lease rights and obligations.
These leveraged, purchase-leaseback investments included two major buildings
housing operations of Hershey Foods in Pennsylvania and six supermarkets leased
to The Kroger Co. in various states. In 1995, HEIIC sold one of the six
supermarkets to the lessee pursuant to the provisions of the leveraged lease
agreement and recorded a net loss of $1.3 million on the sale. For further
information concerning HEIIC's investments in leveraged leases, see Note 7 to
HEI's Consolidated Financial Statements. No significant new investments are
currently planned by HEIIC.

HEI POWER CORP.
- ---------------

HEIPC was formed in March 1995 and its subsidiaries have been and will be formed
from time to time to pursue independent power projects in Asia and the Pacific.

In September 1996, HEIPC's subsidiary, HEI Power Corp. Guam (HPG), entered into
an energy conversion agreement for approximately 20 years with the Guam Power
Authority, pursuant to which 

                                       25
<PAGE>
 
HPG has repaired and is operating and maintaining two oil-fired 25-MW (net)
units. On October 30, 1996, HEI filed with the SEC a "Notification of Foreign
Utility Company Status" on Form U-57 with respect to this project.

HEIPC is actively pursuing other projects in Asia and the Pacific. The success
of any project undertaken by HEIPC in foreign countries will be dependent on
many factors, including the economic, political, technological, regulatory and
logistical circumstances surrounding each project and the location of the
project. Due to political or regulatory actions or other circumstances, projects
may be delayed or even prohibited. There is no assurance that any project
undertaken by HEIPC will be successfully completed or that HEIPC's investment in
any such project will not be lost, in whole or in part.

For further discussion of HEIPC's operating losses and HPG's energy conversion
agreement, see the "Other" section in HEI's MD&A.

DISCONTINUED OPERATIONS
- -----------------------

For information concerning the Company's discontinued property and casualty
insurance operations formerly conducted by HIG and a nonutility wind energy
business, see Note 20 to HEI's Consolidated Financial Statements and the notes
to HEI's Selected Financial Data, incorporated herein by reference to page 25 of
HEI's 1997 Annual Report to Stockholders, portions of which are filed herein as
HEI Exhibit 13. Also see Item 3, "Legal proceedings-Discontinued operations."

REGULATION AND OTHER MATTERS
- ----------------------------

HOLDING COMPANY REGULATION

HEI and HECO are holding companies within the meaning of the Public Utility
Holding Company Act of 1935 (1935 Act). However, under current rules and
regulations, they are exempt from the comprehensive regulation of the Securities
and Exchange Commission (SEC) under the 1935 Act except for Section 9(a)(2)
(relating to the acquisition of securities of other public utility companies)
through compliance with certain annual filing requirements under the 1935 Act
for holding companies which own utility businesses that are intrastate in
character. The exemption afforded HEI and HECO may be revoked if the SEC finds
that such exemption "may be detrimental to the public interest or the interest
of investors or consumers." HEI and HECO may own or have interests in foreign
utility operations without adversely affecting this exemption so long as the
requirements of other exemptions under the 1935 Act are satisfied. HEI has
obtained the PUC certification which is a prerequisite to obtaining an exemption
for foreign utility operations and to the Company's maintenance of its exemption
under the 1935 Act if it acquires such ownership interests. See the previous
discussion of the HPG energy conversion agreement with the Guam Power Authority
under "Other-HEI Power Corp."

Legislation has been introduced in Congress that would repeal the 1935 Act
leaving the regulation of utility holding companies to be governed by other
federal and state laws. Management cannot predict if this legislation will be
enacted or the final form it might take.

HEI is subject to an agreement entered into with the PUC (the PUC Agreement)
when HECO became a wholly owned subsidiary of HEI. The PUC Agreement, among
other things, requires HEI to provide the PUC with periodic financial
information and other reports concerning intercompany transactions and other
matters. It prohibits the electric utilities from loaning funds to HEI or its
nonutility subsidiaries and from redeeming common stock of the electric utility
subsidiaries without PUC approval. Further, the PUC could limit the ability of
the electric utility subsidiaries to pay dividends on their common stock. See
"Restrictions on dividends and other distributions" and "Electric utility
regulation" (regarding the PUC review of the relationship between HEI and HECO).

As a result of the acquisition of ASB, HEI and HEIDI are subject to OTS
registration, supervision and reporting requirements as savings and loan holding
companies.

In the event the OTS has reasonable cause to believe that the continuation by
HEI or HEIDI of any activity constitutes a serious risk to the financial safety,
soundness, or stability of ASB, the OTS is authorized under the Home Owners'
Loan Act of 1933, as amended, to impose certain restrictions in the form of a
directive to HEI and any of its subsidiaries, or HEIDI and any of its
subsidiaries. Such possible restrictions include limiting (i) the payment of
dividends by ASB; (ii) transactions between ASB, HEI or HEIDI, and the
subsidiaries or affiliates of ASB, HEI or HEIDI; and (iii) the activities of ASB
that might create a serious risk that the liabilities of HEI and its other
affiliates, or HEIDI and its other affiliates, may be imposed on ASB.
Theoretically, this authority would allow the OTS to prohibit

                                       26
<PAGE>
 
dividends, limit affiliate transactions or otherwise restrict activities as a
result of losses suffered by HEI, HEIDI or their other subsidiaries, and thus
conceivably may be an indirect means of limiting affiliations between ASB and
affiliates engaged in nonfinancial activities. See "Restrictions on dividends
and other distributions."

OTS regulations also generally prohibit savings and loan holding companies and
their nonthrift subsidiaries from engaging in activities other than those which
are specifically enumerated in the regulations. Such restrictions, if applicable
to HEI and HEIDI, would significantly limit the kinds of activities in which HEI
and HEIDI and their subsidiaries may engage. However, the OTS regulations
provide for an exemption which is available to HEI and HEIDI if ASB satisfies
the "qualified thrift lender" test discussed below. See "Savings bank
regulation--FDIC Improvement Act of 1991 and implementing regulations-Qualified
thrift lender test." ASB currently meets the qualified thrift lender test and
must continue to meet the test in order to avoid restrictions on the activities
of HEI and HEIDI and their subsidiaries which could result in a need to divest
ASB.

HEI and HEIDI are prohibited, directly or indirectly, or through one or more
subsidiaries, from (i) acquiring control of, or acquiring by merger or purchase
of assets, another insured institution or holding company thereof, without prior
written OTS approval; (ii) acquiring more than 5% of the voting shares of
another savings association or savings and loan holding company which is not a
subsidiary; or (iii) acquiring or retaining control of a savings association not
insured by the FDIC. No director or officer of HEI or HEIDI, or person
beneficially owning more than 25% of such holding company's voting shares, may,
except with the prior approval of the OTS, (a) also serve as director, officer,
or employee of any insured institution or (b) acquire control of any savings
association not a subsidiary of such holding company. On May 26, 1997, ASB
entered into a Purchase and Assumption Agreement with BoA to assume
substantially all of the Hawaii deposit liabilities of BoA and acquire most of
its Hawaii branches and certain of its Hawaii-based loans.  On October 29, 1997,
the OTS approved the transaction and the transaction closed effective
December 6, 1997.

RESTRICTIONS ON DIVIDENDS AND OTHER DISTRIBUTIONS

HEI is a legal entity separate and distinct from its various subsidiaries. As a
holding company with no significant operations of its own, the principal sources
of its funds are dividends or other distributions from its operating
subsidiaries, borrowings and sales of equity. The rights of HEI and,
consequently, its creditors and shareholders, to participate in any distribution
of the assets of any of its subsidiaries is subject to the prior claims of the
creditors and preferred stockholders of such subsidiary, except to the extent
that claims of HEI in its capacity as a creditor are recognized.

The ability of certain of HEI's subsidiaries to pay dividends or make other
distributions to HEI is subject to contractual and regulatory restrictions.
Under the PUC Agreement, in the event that the consolidated common stock equity
of the electric utility subsidiaries falls below 35% of total electric utility
capitalization, the electric utility subsidiaries would be restricted, unless
they obtained PUC approval, in their payment of cash dividends to 80% of the
earnings available for the payment of dividends in the current fiscal year and
preceding five years, less the amount of dividends paid during that period. The
PUC Agreement also provides that the foregoing dividend restriction shall not be
construed to relinquish any right the PUC may have to review the dividend
policies of the electric utility subsidiaries. The consolidated common stock
equity of HEI's electric utility subsidiaries was 50% of their total
capitalization (including the current maturities of long-term debt and preferred
stock sinking fund requirements due within one year but excluding short-term
borrowings) as of December 31, 1997. As of  December 31, 1997, HECO and its
subsidiaries had net assets of $769 million, of which approximately $410 million
were not available for transfer to HEI without regulatory approval.

The ability of ASB to make capital distributions to HEI and other affiliates is
restricted under federal law. Subject to a limited exception for stock
redemptions that do not result in any decrease in ASB's capital and would
improve ASB's financial condition, ASB is prohibited from declaring any
dividends, making any other capital distribution, or paying a management fee to
a controlling person if, following the distribution or payment, ASB would be
deemed to be under-capitalized, significantly under-capitalized or critically
under-capitalized. See "Savings bank regulation--FDIC Improvement Act of 1991
and Implementing Regulations--Prompt corrective action."

As a Tier-1 institution (one that meets its capital requirements and has not
been notified by the OTS that it is in need of more than normal supervision),
ASB may make capital distributions in amounts up to one-half of ASB's surplus
capital ratio (the amount of its capital in excess of its capital requirement)
at 

                                       27
<PAGE>
 
the beginning of a calendar year, plus its year-to-date net income for that
calendar year. ASB, as a Tier-1 institution, may exceed the foregoing limits if
ASB provides a thirty-day advance notice to the OTS and receives no objection
within thirty days. Even in the case of distributions within the permissible
limits, however, a thirty day advance notice to the OTS is required.

HEI and its subsidiaries are also subject to debt covenants, preferred stock
resolutions and the terms of guarantees that could limit their respective
abilities to pay dividends. The Company does not expect that the regulatory and
contractual restrictions applicable to HEI or its direct and indirect
subsidiaries will significantly affect the operations of HEI or its ability to
pay dividends on its common stock.

ELECTRIC UTILITY REGULATION

The PUC regulates the rates, issuance of securities, accounting and certain
other aspects of the operations of HECO and its electric utility subsidiaries.
See the previous discussion under "Electric utility-Rates" and the "Regulation
of electric utility rates" and "Recent rate requests" sections in HECO's MD&A.

The PUC has ordered the electric utility subsidiaries to develop plans for the
integration of demand-side and supply-side resources available to meet consumer
energy needs efficiently, reliably and at the lowest reasonable cost. See the
previous discussion under "Electric utility-Integrated Resource Planning and
requirements for additional generating capacity."

In March 1995, the PUC opened a generic docket to investigate whether Hawaii
public utilities should be allowed to establish property damage reserves to
recover the cost of damage to their facilities and equipment caused by
catastrophic disasters. See "Property damage reserve" in HECO's MD&A. In March
1998, the PUC determined that it would not be in the best interests of the
ratepayer to allow the utilities to establish a ratepayer funded self-insured
property damage reserve. The PUC based its conclusion on: (1) the unknown
probability of the occurrence of natural disasters and the uncertain magnitude
of the resulting damages; (2) the intergenerational inequity that ratepayer-
funded self-insurance programs create; and (3) the unclear tax effects of such
reserves. In the order the PUC noted that, in an earlier decision regarding
restoration expenses incurred by another electric utility as a result of
Hurricane Iniki in 1992, the PUC had determined that the other utility's
shareholders should not bear any of the restoration expenses. The PUC observed
that one of the factors it considered in its earlier decision was the regulatory
compact. The PUC also observed that the utility industry is facing competitive
pressures and is undergoing changes, and, in light of this the relative
responsibilities of ratepayers and shareholders for the cost of restoration and
repair of any damage caused by uninsured catastrophic natural disasters will
continue to be judged on the basis of the facts of each situation. Management
cannot predict how the PUC might apportion the responsibility for restoration
costs with respect to any uninsured catastrophic losses that HECO or its
subsidiaries may incur in the future.

On December 30, 1996, the PUC issued an order instituting a proceeding to
identify and examine the issues surrounding electric competition and to
determine the impact of competition on the electric utility infrastructure in
Hawaii. See the previous discussion under "Electric utility-Competition."

On March 10, 1997, the PUC issued a show cause order to HECO requesting
information to assist the PUC in determining if it should reduce HECO's rates
and require HECO to refund any excess earnings to its ratepayers.  See the
previous discussion under "Electric utility-PUC Show Cause Order."

Any adverse decision or policy made or adopted by the PUC, or any prolonged
delay in rendering a decision, could have a material adverse effect on
consolidated HECO's and the Company's financial condition, results of operations
or liquidity.

Certain transactions between HEI's public utility subsidiaries (HECO, MECO and
HELCO) and HEI and affiliated interests, are subject to regulation by the PUC.
All contracts (including summaries of unwritten agreements), made on or after
July 1, 1988 of $300,000 or more in a calendar year for management, supervisory,
construction, engineering, accounting, legal, financial and similar services and
for the sale, lease or transfer of property between a public utility and
affiliated interests must be filed with the PUC to be effective, and the PUC may
issue cease and desist orders if such contracts are not filed. All such
affiliated contracts for capital expenditures (except for real property) must be
accompanied by comparative price quotations from two nonaffiliates, unless the
quotations cannot be 

                                       28
<PAGE>
 
obtained without substantial expense. Moreover, all transfers of $300,000 or
more of real property between a public utility and affiliated interests require
the prior approval of the PUC and proof that the transfer is in the best
interest of the public utility and its customers. If the PUC, in its discretion,
determines that an affiliated contract was unreasonable or otherwise contrary to
the public interest, the utility must either revise the contract or risk
disallowance of the payments for rate-making purposes. In rate-making
proceedings, a utility must also prove the reasonableness of payments made to
affiliated interests under any affiliated contracts of $300,000 or more by clear
and convincing evidence. An "affiliated interest" is defined by statute and
includes officers and directors of a public utility, every person owning or
holding, directly or indirectly, 10% or more of the voting securities of a
public utility, and corporations which have in common with a public utility more
than one-third of the directors of that public utility.

To address community concerns expressed at the time, HECO proposed by letter
dated January 25, 1993, that the PUC initiate a review of the relationship
between HEI and HECO and the effects of that relationship on the operations of
HECO. By an order dated January 26, 1993, the PUC opened a docket and initiated
such a review to determine whether the HEI-HECO relationship, HEI's diversified
activities, and HEI's policies, operations and practices had resulted in or were
having any negative effects on HECO, its electric utility subsidiaries and
ratepayers. In May 1994, a consultant, Dennis Thomas and Associates, was
selected by the PUC to perform the review. In early 1995, Dennis Thomas and
Associates issued its report to the PUC. The report concluded that "on balance,
diversification has not hurt electric ratepayers." Other major findings of the
study were that no utility assets have been used to fund HEI's nonutility
investments or operations, HEI has not denied needed capital to the electric
utilities and management processes within the electric utilities operate without
interference from HEI. The report also included a number of recommendations,
most of which the Company has implemented. In December 1996, the PUC issued an
order that adopted the Dennis Thomas and Associates report, ordered HECO to
continue to provide the PUC with status reports on its compliance with the PUC
agreement (pursuant to which HEI became the holding company of HECO) and closed
the investigation and proceeding. In the order, the PUC stated that it adopted
the recommendation that HECO, MECO and HELCO present a comprehensive analysis of
the impact that the holding company structure and investments in nonutility
subsidiaries have on a case-by-case basis on the cost of capital to each utility
in future rate cases and remove such effects from the cost of capital. See also
"Holding company regulation."

HECO and its subsidiaries are not subject to regulation by the Federal Energy
Regulatory Commission (FERC) under the Federal Power Act, except under Sections
210 through 212 (added by Title II of PURPA and amended by the Energy Policy Act
of 1992), which permit the FERC to order electric utilities to interconnect with
qualifying cogenerators and small power producers, and to wheel power to other
electric utilities. Title I of PURPA, which relates to retail regulatory
policies for electric utilities, also applies to HECO and its subsidiaries.
Title VII of the Energy Policy Act of 1992, which creates "exempt wholesale
generators" (EWGs) as a category that is exempt from the 1935 Act and which
addresses transmission access, also applies to HECO and its subsidiaries. The
Company cannot predict the extent to which cogeneration, EWGs, or transmission
access, will reduce its electrical loads, reduce its current and future
generating and transmission capability requirements, or affect its financial
condition, results of operations or liquidity.

Because they are located in the State of Hawaii, HECO and its subsidiaries are
exempt by statute from limitations set forth in the Powerplant and Industrial
Fuel Act of 1978 on the use of petroleum as a primary energy source.

SAVINGS BANK REGULATION

ASB, a federally chartered savings bank, and its holding companies are subject
to the regulatory supervision of the OTS and, in certain respects, the Federal
Deposit Insurance Corporation (FDIC). In addition, ASB must comply with Federal
Reserve Board reserve requirements and OTS liquidity requirements. See
"Liquidity and capital resources--Savings bank" in HEI's MD&A.

For a discussion of the disparity in the deposit insurance assessment rates and
Financing Corporation assessment rates that ASB and other thrifts have paid in
relation to the rates that most commercial banks have paid, the special
assessment made by the FDIC on ASB and other thrifts in 1996 to provide adequate
funding for the SAIF and thereby permit a reduction in deposit insurance
assessment rates for 

                                       29
<PAGE>
 
thrifts and potential federal legislation affecting financial institutions, see
"Deposit insurance premiums and regulatory developments" in Note 4 to HEI's
Consolidated Financial Statements.

Deposit insurance coverage.  The FDIC Improvement Act of 1991 (FDICIA) amended
various provisions of the Federal Deposit Insurance Act governing deposit
insurance coverage. FDICIA, as further implemented by amendments to the FDIC's
deposit insurance regulations, made certain significant changes relating to pro
rata or "pass through" insurance coverage for employee benefit plan participants
and beneficiaries, and insurance coverage for certain retirement accounts and
trust funds. (The term "pass-through" insurance means that the insurance
coverage passes through to each owner/beneficiary of the applicable deposit.)
Although the vast majority of the FDIC's deposit insurance regulations remain
unchanged (such as the basic rules providing that individual accounts are
insured to $100,000 separately from qualifying joint accounts), several
important changes were made.

Effective December 19, 1993, an individual's interest in deposits at the same
institution in any combination of certain retirement accounts will be added
together and insured up to $100,000 in the aggregate. This is a reduction from
the maximum of $400,000 in insurance coverage formerly provided if deposits were
made in four different types of retirement plan accounts.

"Pass-through" insurance coverage for the deposits of most employee benefit
plans (i.e., $100,000 per individual participating, not $100,000 per plan)
generally continues only for institutions that are "well-capitalized" under the
FDIC's prompt corrective action regulations. The FDIC has amended its deposit
insurance regulations to require financial institutions to provide employee
benefit plan depositors information, not otherwise available, on the
institution's capital category and whether "pass-through" deposit insurance is
available. As of December 31, 1997, ASB was "well-capitalized".

Financial Institutions Reform, Recovery, and Enforcement Act of 1989 and
- ------------------------------------------------------------------------
implementing regulations
- ------------------------

Capital requirements. Under the Financial Institutions Reform, Recovery, and
Enforcement Act of 1989 (FIRREA), the OTS set three capital standards for
thrifts, each of which must be no less stringent than those applicable to
national banks. As of December 31, 1997, ASB was in compliance with all of the
minimum standards with a core capital ratio of 5.1% (compared to a 3%
requirement), a tangible capital ratio of 5.0% (compared to a 1.5% requirement)
and risk-based capital ratio of 11.9% (based on risk-based capital of
$296 million, $97 million in excess of the 8% requirement).

In 1996, the Board of Governors of the Federal Reserve System, the FDIC and the
Office of the Comptroller of the Currency issued a joint agency policy statement
to bankers to provide guidance on sound practices for managing IRR. Effective
June 26, 1996, the joint agency policy statement augments the action taken by
the agencies in 1995 to implement the portion of the FDICIA addressing risk-
based capital standards for IRR. It also replaces the proposed joint agency
policy statement that the agencies issued for comment in 1995 regarding a
supervisory framework for measuring and assessing banks' IRR exposures. The
agencies have elected not to pursue a standardized measure and explicit capital
charge for IRR at this time. This decision reflects concerns about the burden,
accuracy and complexity of a standardized measure and recognition that industry
techniques for measuring IRR are continuing to evolve. Nonetheless, the agencies
will continue to place significant emphasis on the level of a bank's IRR
exposure and the quality of its risk management process when evaluating a bank's
capital adequacy. Although the OTS has indicated that it will review any
differences between its approach and that of the other agencies for the purpose
of achieving greater consistency and uniformity among all four agencies, the
impact of the joint agency policy statement on the IRR rule adopted by the OTS
and ultimately on ASB cannot be predicted at this time.

Affiliate transactions.  Significant restrictions apply to certain transactions
between ASB and its affiliates, including HEI and its direct and indirect
subsidiaries. FIRREA significantly altered both the scope and substance of such
limitations on transactions with affiliates and provides for thrift affiliate
rules similar to, but more restrictive than, those applicable to banks. For
example, ASB is prohibited from making any loan or other extension of credit to
an entity affiliated with ASB unless the affiliate is engaged exclusively in
activities which the Federal Reserve Board has determined to be permissible for
bank holding companies. There are also various other restrictions which apply to
certain transactions between ASB and certain executive officers, directors and
insiders of ASB. ASB is also barred from making a purchase of or any investment
in securities issued by an affiliate, other than with respect to shares of a
subsidiary of ASB.

                                       30
<PAGE>
 
FDIC Improvement Act of 1991 and implementing regulations
- ---------------------------------------------------------

FDICIA subjects the banking and thrift industries to heightened regulation and
supervision. FDICIA made a number of reforms addressing the safety and soundness
of the deposit insurance system, supervision of domestic and foreign depository
institutions and improvement of accounting standards. FDICIA also limited
deposit insurance coverage, implemented changes in consumer protection laws and
called for least-cost resolution and prompt corrective action with regard to
troubled institutions.

Pursuant to FDICIA, the federal banking agencies have promulgated regulations
which may affect the operations of ASB and its holding companies. Such
regulations address, for example, standards for safety and soundness, real
estate lending, accounting and reporting, transactions with affiliates, and
loans to insiders.

Prompt corrective action.  FDICIA establishes a statutory framework that is
triggered by the capital level of a savings association and subjects it to
progressively more stringent restrictions and supervision as capital levels
decline. The OTS rules implement the system of prompt corrective action. In
particular, the rules define the relevant capital measures for the categories of
"well-capitalized", "adequately capitalized", "under-capitalized",
"significantly under-capitalized" and "critically under-capitalized".

A savings association that is under-capitalized or significantly under-
capitalized is subject to additional mandatory supervisory actions and a number
of discretionary actions if the OTS determines that any of the actions is
necessary to resolve the problems of the association at the least possible long-
term cost to the SAIF. A savings association that is critically under-
capitalized must be placed in conservatorship or receivership within 90 days,
unless the OTS and the FDIC concur that other action would be more appropriate.

Interest rates.  FDIC regulations restrict the ability of financial institutions
that are not "Well-capitalized" to offer interest rates on deposits that are
significantly higher than the rates offered by competing institutions. As of
December 31, 1997, ASB was "well-capitalized" and thus, not subject to these
interest rate restrictions.

Qualified thrift lender test.  The FDICIA amended the qualified thrift lender
(QTL) test provisions of FIRREA by reducing the percentage of assets thrifts
must maintain in housing-related loans and investments from 70% to 65%, and
changing the computation period to require that the percentage be reached on a
monthly average basis in nine out of the previous 12 months. Savings
associations that fail to satisfy the QTL test by not holding the required
percentage of housing-related investments are subject to various penalties,
including limitations on their activities and restrictions on their FHLB
advances. Failure to satisfy the QTL test would also bring into operation
restrictions on the activities that may be engaged in by HEI, HEIDI and their
other subsidiaries and could effectively result in the required divestiture of
ASB. At all times during 1997, ASB was in compliance with the QTL test. See
"Holding company regulation."

Federal Home Loan Bank System
- -----------------------------

ASB is a member of the FHLB System which consists of 12 regional FHLBs. The FHLB
System provides a central credit facility for member institutions. ASB, as a
member of the FHLB of Seattle, is required to own shares of capital stock in the
FHLB of Seattle in an amount equal to the greater of 1% of ASB's aggregate
unpaid residential loan principal at the beginning of each year, 0.3% of total
assets or 5% of FHLB advances outstanding. The FHLBs serve as the central
liquidity facilities for savings associations and resources of long-term funds
for financing housing. Long-term advances may only be made for the purpose of
providing funds for financing residential housing. Additionally, at such time as
an advance is made or renewed, it must be secured by collateral from one of the
following categories: (1) fully disbursed, whole first mortgages on improved
residential property, or securities representing a whole interest in such
mortgages; (2) securities issued, insured or guaranteed by the U.S. Government
or any agency thereof; (3) FHLB deposits; and (4) other real estate-related
collateral that has a readily ascertainable value and with respect to which a
security interest can be perfected. The aggregate amount of outstanding advances
secured by such other real estate-related collateral may not exceed 30% of the
member's capital.

Other laws.  ASB is subject to federal and state consumer protection laws which
affect lending activities, such as the Truth-in-Lending Law, the Truth in
Savings Act, the Equal Credit Opportunity Act, the Real Estate Settlement
Procedures Act and several federal and state financial privacy acts. 

                                       31
<PAGE>
 
These laws may provide for substantial penalties in the event of noncompliance.
Management of ASB believes that its lending activities are in compliance with
these laws and regulations.

The Community Reinvestment Act (CRA) was enacted by Congress in 1977 to ensure
that banks and thrifts help meet the credit needs of their communities,
including low- and moderate-income areas, consistent with safe and sound lending
practices. The OTS will consider ASB's CRA record in evaluating an application
for a new deposit facility, including the establishment of a branch, the
relocation of a branch or office, or the acquisition of an interest in another
bank or thrift. ASB received a verbal CRA rating of "outstanding" from the OTS
in December 1997.

For a discussion of federal and state interstate branching legislation, see
"Liquidity and capital resources--Savings bank" in HEI's MD&A.

In August 1996, federal legislation was enacted that repeals the percentage of
taxable income method of tax accounting for bad debt reserves used by ASB and
other "large" thrift institutions. In place of this bad debt reserve method, ASB
is required to use the specific charge-off method used by most other businesses.
These rules are generally effective for taxable years beginning after 1995. The
related transaction rules eliminate the potential recapture of federal income
tax deductions arising from the bad debt reserve created prior to 1988. Only
post-1987 reserve net additions are subject to recapture into taxable income
ratably over a six-year period, beginning in 1997. ASB has established a
deferred tax liability of approximately $4.8 million for its post-1987 reserve.

Pending legislation. For a discussion of potential federal legislation
addressing the merger of the BIF and SAIF, thrift rechartering and financial
modernization, and possible adverse effects on HEI, see "Deposit-insurance
premiums and regulatory developments" in Note 4 to HEI's Consolidated Financial
Statements.

FREIGHT TRANSPORTATION REGULATION

The PUC has broad authority in its regulation of the intrastate business and
operations of YB. See "Other--Freight transportation--Hawaiian Tug & Barge Corp.
and Young Brothers, Limited." In particular, the PUC has the authority to review
and modify YB's intrastate rates and charges under the Hawaii Water Carrier Act.
In all rate proceedings under such act, YB has the burden of proving the
reasonableness of expenditures, contracts, leases or other transactions. An
adverse decision or policy adopted by the PUC, or a delay in granting requested
rate or other relief, could have a material adverse effect on the financial
condition, results of operations or liquidity of YB.

ENVIRONMENTAL REGULATION

HEI and its subsidiaries are subject to federal and state statutes and
governmental regulations pertaining to water quality, air quality and other
environmental factors.

Water quality controls. As part of the process of generating electricity, water
used for condenser cooling of the electric utility subsidiaries' steam electric
generating stations is discharged into ocean waters or into underground
injection wells. The subsidiaries are required periodically to obtain permits
from the DOH in order to be allowed to discharge the water, including obtaining
permit renewals for existing facilities and new permits for new facilities. The
electric utility subsidiaries must obtain National Pollutant Discharge
Elimination System (NPDES) permits from the DOH to allow wastewater and storm
water discharges into state waters for their coastal generating stations and
Underground Injection Control (UIC) permits for wastewater discharge to
underground injection wells for one MECO facility and several HELCO facilities.

The Federal Oil Pollution Act of 1990 (OPA) governs actual or threatened oil
releases in navigable U.S. waters (inland waters and up to three miles offshore)
and waters of the U.S.' exclusive economic zone (up to 200 miles to sea from the
shoreline). Responsible parties under OPA are jointly, severally and strictly
liable for oil removal costs incurred by the federal government or the state and
damages to natural resources and real or personal property. Responsible parties
include vessel owners and operators. OPA imposes fines and jail terms ranging in
severity depending on how the release was caused. OPA also requires that
responsible parties submit certificates of financial responsibility sufficient
to meet the responsible party's maximum limited liability. HTB complies with
this requirement through coverage with the Water Quality Insurance Syndicate and
YB qualifies as a self-insurer. The Coast Guard issued interim guidelines in
September 1992, which included the requirement that a spill response plan be
submitted by February 18, 1993, and be finalized by August 18, 1993. The EPA and
Hawaii Department 

                                       32
<PAGE>
 
of Transportation (DOT) also have similar requirements for submission of spill
response plans. The EPA issued its proposed rules and guidelines on this matter
in February 1993. With HTB exiting the fuel transportation business at the end
of 1993, the Company's freight transportation operations subject the Company to
significantly lessened environmental risks. HTB's fuel and lubricating oil and
the other cargo carried in its barges may be accidentally discharged into ocean
waters causing a pollution hazard, but the quantities carried do not pose a
major environmental hazard. HTB and YB employees are trained to respond to oil
or other spills that occur. HTB and YB filed spill response plans in 1993, 1995
and 1996. The utilities filed preliminary spill response plans in 1993 for
certain facilities. Revised Facility Spill Response Plans (FSRPs) and additional
FSRPs were filed in 1994 and 1995.

Due to a leak in the fuel transfer system, approximately 100 gallons of bunker
fuel oil were released to a HELCO Shipman facility drainage well system in
November 1996. The release was reported to state and county agencies in December
1996. Although the fuel oil was removed from the well system and the well system
was cleaned, oil continued to seep back into the well system from behind the
retaining walls until March 1997. Monitoring and removal of this residual oil
continued. In March 1997, HELCO received a letter from the DOH concurring with
the ongoing cleanup approach and stating that more aggressive cleanup measures
should be considered if oil seepage into the drainage wells worsens. Oil seepage
into the well system has not been observed since March 1997.

Due to leaks in two wastewater treatment system tanks, an estimated
2,000 gallons of boiler cleaning wastewater was released to a HELCO Hill
facility drainage well in January 1997. After confirming that the wastewater
discharged exhibited characteristics of a hazardous waste, notification was
provided to federal, state and county agencies. A post-release drainage well
sample collected indicated that well conditions were nonhazardous. The treatment
tanks were repaired, the drainage well cleaned and a semiannual well status
check was performed by a consultant with satisfactory results. The DOH issued a
Notice of Apparent Violation of the UIC permit in February 1997 and will notify
HELCO of required compliance action, if any, stemming from this incident.

In April 1997, HECO, on behalf of HELCO, notified the DOH that it became aware
that industrial oily wastewater was discharging into HELCO's Waimea facilityOs
dry well system in noncompliance with the facility's UIC permit. The discharge
of oily wastewater was stopped and, in May 1997, a written incident report was
submitted to the DOH. The DOH issued a Notice of Apparent Violation. The well
was cleaned and in July 1997 a response was submitted to a DOH request for
information.  The DOH performed a site inspection in September 1997 and, in
January 1998, the DOH issued a Notice of Violation (NOV) imposing a civil
penalty fine on HELCO of $36,000, which HELCO paid in January 1998. The DOH has
closed this case.

Air quality controls. The generation stations of the utility subsidiaries
operate under air pollution control permits issued by the DOH and, in a limited
number of cases, by the EPA. The entire electric utility industry is being
affected by the 1990 Amendments to the Clean Air Act. Hawaii utilities may be
affected by the air toxics provisions (Title III) when the Maximum Allowable
Control Technology (MACT) emission standards are proposed for generation units.
Hawaii utilities are affected by the operating permit provisions (Title V). The
DOH adopted implementing regulations on November 26, 1993 which required
submission of permit applications during 1994 for existing sources. All
applications were filed in 1994 as required and supplementary information was
filed in 1995, 1996 and 1997. Results of further air quality analyses could
trigger requirements to mitigate emission impacts. Reports on emissions of air
toxics could trigger requirements to conduct risk assessments. Hawaii utilities
are also affected by the enforcement provisions (Title VII) which require the
EPA to promulgate new regulations which mandate "enhanced monitoring" of
emissions from many generation units. The EPA proposed a rule, called Compliance
Assurance Monitoring (CAM), in August 1996, and a final rule was issued in
October 1997. The CAM rule may require minor changes in emissions reporting
procedures, however, no emission monitor retrofits will be required for HECO,
HELCO and MECO.

On November 1, 1989, the DOH issued a NOV indicating that Maalaea units X-1 and
X-2 had exceeded operating limitations of 12 hours per day at various times in
1988. These incidents resulted from unscheduled unit outages and resulted in no
net increase in emissions by MECO. Subsequently, MECO took steps to preclude
future violations. An application for a permit modification was submitted to the
EPA, revising the operating hour limitation to annual rather than daily.
Approval was received from the EPA in July 1992. Units X-1 and X-2 continue to
operate in compliance with the revised permit.

                                       33
<PAGE>
 
Following a unit overhaul, emission compliance tests conducted for MECO's
Maalaea Unit 14 in late 1995 indicated that particulate emissions were in excess
of PSD permit limits. Corrective actions were taken and a retest in February
1996 confirmed that the unit returned to compliance with PSD limits. All test
reports were submitted to the DOH. By letter dated July 15, 1996, the DOH
indicated that a NOV will be issued for the past violations. By letter dated
January 31, 1997, the DOH invited MECO to meet to discuss settlement of this and
other open matters. By letter dated March 3, 1998, the DOH transmitted a draft
Consent Order to MECO, resolving all open MECO air emission compliance matters
which occurred from 1988 through 1996 (including the NOV for Maalaea units X-1
and X-2 described in the previous paragraph and past violations of Maalaea Unit
14). The draft Consent Order will be submitted for public comment. Under the
proposed settlement, MECO will contribute $100,000 over the next two years to an
environmental education program relating to air quality.

Initial source tests in December 1989 and subsequent retesting for HELCO's CT-2
generating unit indicated particulate emissions above permitted levels.
Following analysis, HECO (on behalf of HELCO) proposed in November 1990 that the
permitted particulate limit be increased. By letter dated April 13, 1992, the
EPA concurred that revision is warranted. The DOH issued a NOV on August 17,
1992 for the noncomplying emissions. HECO and HELCO worked with the DOH, the
manufacturer and a consultant to determine an appropriate new emission limit for
particulates as well as oxides of nitrogen. In accordance with discussions with
the DOH, CT-2 continues to operate pending issuance of a revised permit. On
January 20, 1998, the DOH issued a NOV to HELCO for noncomplying emissions from
March 16, 1993 through December 20, 1994 and from March 22, 1996 through
November 6, 1997. HELCO paid fines totaling $22,100 in the settlement of both
the 1992 and 1998 NOV's. Unit CT-2 is currently operating within all permit
limits by virtue of its having passed its November 1997 source test.

Hazardous waste and toxic substances controls. The operations of the electric
utility and freight transportation subsidiaries are subject to regulations
promulgated by the EPA to implement the provisions of the Resource Conservation
and Recovery Act (RCRA), the Superfund Amendments and Reauthorization Act (SARA)
and the Toxic Substances Control Act (TSCA). The DOH has been working towards
obtaining primacy to operate state-authorized RCRA (hazardous waste) programs.
The DOH finalized RCRA administrative rules in mid-June 1994, with the rules
becoming effective on June 18, 1994. The DOH's state contingency plan and the
State of Hawaii Environmental Response Law (ERL) rules were adopted in August
1995.

Whether on a federal or state level, RCRA provisions identify certain wastes as
hazardous and set forth measures that must be taken in the transportation,
storage, treatment and disposal of these wastes. Some of the wastes generated at
steam electric generating stations possess characteristics which make them
subject to these EPA regulations. Since October 1986, all HECO generating
stations have operated RCRA-exempt wastewater treatment units to treat
potentially regulated wastes from occasional boiler waterside and fireside
cleaning operations. Steam generating stations at MECO and HELCO also operate
similar RCRA-exempt wastewater management systems. In March 1990, the EPA
changed RCRA testing requirements used to characterize a waste as hazardous
which potentially affected the hazardous waste generating status of all
facilities. HECO's continuing program to recharacterize all HECO, MECO and HELCO
wastestreams has demonstrated the adequacy of the existing treatment systems and
identified other potential compliance requirements. Waste recharacterization
studies indicate that treatment facility wastestreams are nonhazardous and no
change in RCRA generator status is required.

RCRA underground storage tank (UST) regulations require all facilities with USTs
used to store petroleum products to comply with costly leak detection, spill
prevention and new tank standard retrofit requirements within a specified
compliance period based on tank age. On August 5, 1996, EPA conducted an UST
Field Citation inspection at the Ward Avenue complex. During the inspection HECO
was cited for a minor infraction, which was immediately corrected. HECO expects
to receive a NOV and a nominal fine.

The Emergency Planning and Community Right-to-Know Act (EPCRA) under SARA Title
III requires HECO, MECO and HELCO to report hazardous chemicals present in their
facilities in order to provide the public with information on these chemicals so
that emergency procedures can be established to protect the public in the event
of hazardous chemical releases. All HECO, MECO and HELCO facilities are in
compliance with applicable annual reporting requirements to the State Emergency
Planning Commission, the Local Emergency Planning Committee and local fire
departments. In September 1995, the EPA published a notice of proposed rule
making to expand the types of industries required to file 

                                       34
<PAGE>
 
annual Toxic Release Inventory reports (i.e., to report facility releases of
toxic chemicals). The final rule includes the steam electric category (effective
January 1, 1998), which previously was exempt from Toxic Release Inventory
reporting requirements. Facilities are implementing actions to comply with
reporting requirements. Release reports for 1998 must be filed with the EPA by
July 1, 1999.

The TSCA regulations specify procedures for the handling and disposal of
polychlorinated biphenyls (PCB), a compound found in transformer and capacitor
dielectric fluids. HECO and its subsidiaries have instituted procedures to
monitor compliance with these regulations. In addition, HECO has implemented a
program to identify and replace PCB transformers and capacitors in the HECO
system. All HECO, MECO and HELCO facilities are currently believed to be in
compliance with PCB regulations. In December 1994, the EPA published in the
Federal Register a Proposed Rule to amend PCB disposal regulations. The proposed
rule calls for changes in determining PCB concentrations, and in marking,
storage and disposal requirements. A final rule is pending.

By letter dated August 21, 1992, the EPA provided MECO with a notice of
potential liability and request for information relating to a federal Superfund
closure investigation at the North American Environmental, Inc. (NAE) storage
facility in Clearfield, Utah. MECO was identified by the EPA as a potentially
responsible party for three PCB capacitors originally contracted for disposal by
Westinghouse. Although Westinghouse has already disposed of the capacitors, MECO
was obligated to comply with the information requests attached to the EPA
notice. A preliminary response to the EPA's information request was submitted to
the EPA on October 5, 1992. MECO has since received confirmation from
Westinghouse that the three capacitors were removed from the NAE facility and
incinerated at Aptus (an EPA-approved facility in Kansas) on September 16, 1992.
By letter dated December 2, 1992, the EPA notified MECO that a draft
Administrative Order on Consent (AOC) for the cleanup of the NAE facility had
been sent to potentially responsible parties that have waste remaining at the
NAE site and to parties that have expressed a desire to participate in the
cleanup. MECO did not receive a draft AOC because the three PCB capacitors were
removed from the NAE facility and incinerated. By letter dated February 8, 1993,
Westinghouse confirmed that it would indemnify MECO pursuant to its contract for
this matter. In early 1995, the EPA issued an AOC to the Freeport Center and the
Defense Logistics Agency. Both parties are initiating corrective actions.
Recovery of cleanup costs may fall back on other potentially responsible parties
once cleanup is completed and costs have been determined.

The Environmental Response Law of the State of Hawaii (ERL), as amended, governs
releases of hazardous substances, including oil, in areas within the state's
jurisdiction. Responsible parties under the ERL are jointly, severally and
strictly liable for a release of a hazardous substance into the environment.
Responsible parties include owners or operators of a facility where a hazardous
substance comes to be located and any person who at the time of disposal of the
hazardous substance owned or operated any facility at which such hazardous
substance was disposed. The DOH issued final rules (or State Contingency Plan)
implementing the ERL on August 17, 1995. Potential exposure to liability under
the ERL/State Contingency Plan is associated with the release of regulated
substances, including oil, to the environment.

For information regarding the investigation of the Honolulu Harbor area, see
Note 22 to HEI's Consolidated Financial Statements and Note 12 to HECO's
Consolidated Financial Statements.

Both HTB and YB generate small quantities of hazardous wastes as a result of
operations and equipment maintenance activities and have contracted with a firm
to dispose of these wastes in compliance with the EPA regulations and the RCRA
provisions. YB, as a public carrier, also moves hazardous wastes and explosives
for customers. Employees are trained in the applicable handling methods to
assist in the safe movement of these cargoes. Both HTB and YB are subject to the
jurisdiction of the Coast Guard which monitors ocean activities to ensure
compliance with federal regulations.

ASB may be subject to the provisions of the Comprehensive Environmental
Response, Compensation and Liability Act (CERCLA) and regulations promulgated
thereunder. CERCLA imposes liability for environmental cleanup costs on certain
categories of responsible parties, including the current owner and operator of a
facility and prior owners or operators who owned or operated the facility at the
time the hazardous substances were released or disposed. CERCLA exempts persons
whose ownership in a facility is held primarily to protect a security interest,
provided that they do not participate in the management of the facility.
Although there may be some risk of liability for ASB for environmental 

                                       35
<PAGE>
 
cleanup costs, the Company believes the risk is not as great for ASB, which
specializes in residential lending, as it may be for other depository
institutions which have a larger portfolio of commercial loans.

For information about HPG, see the "Other" section in HEI's MD&A.

SECURITIES RATINGS
- ------------------

As of March 17, 1998, the Standard & Poor's (S&P), Moody's Investors Service
(Moody's) and Duff & Phelps Credit Rating Co.'s (Duff & Phelps) ratings of HEI's
and HECO's securities were as follows:

<TABLE>
<CAPTION>
                                                   S&P               Moody's          Duff & Phelps
- ------------------------------------------------------------------------------------------------------------
<S>                                                <C>                 <C>                 <C>
 
HEI
- ---
Medium-term notes...............................   BBB                 Baa2                BBB+
Commercial paper................................   A-2                 P-2                 Duff 2
HEI-obligated preferred securities of
   trust subsidiaries...........................   BBB-                baa3                BBB

HECO
- ----
First mortgage bonds............................   A-                  A3                  A
Revenue bonds and medium-term notes.............   BBB+                Baa1                A-
Cumulative preferred stock......................   BBB                 baa1                BBB+
Commercial paper................................   A-2                 P-2                 Duff 1-
HECO-obligated preferred securities of
   trust subsidiary.............................   BBB                 baal                BBB+
</TABLE>

These ratings reflect only the view of the applicable rating agency at the time
the ratings are issued, from whom an explanation of the significance of such
ratings may be obtained. Each rating should be evaluated independently of any
other rating. There is no assurance that any such credit rating will remain in
effect for any given period of time or that such rating will not be lowered,
suspended or withdrawn entirely by the applicable rating agency if, in such
rating agency's judgment, circumstances so warrant. Any such lowering,
suspension or withdrawal of any rating may have an adverse effect on the market
price or marketability of HEIO's and/or HECO's securities, which could increase
the cost of capital of HEI and HECO. Neither HEI nor HECO management can predict
future rating agency actions or their effects on the future cost of capital of
HEI or HECO.

RESEARCH AND DEVELOPMENT
- ------------------------

HECO and its subsidiaries expensed approximately $2.3 million, $2.1 million and
$2.2 million in 1997, 1996 and 1995, respectively, for research and development.
Contributions to the Electric Power Research Institute accounted for most of the
expenses. There were also expenses in the areas of energy conservation,
environmental and emissions controls, and expenses for studies relative to
technologies that are applicable to HECO, its subsidiaries and their customers.

EMPLOYEE RELATIONS
- ------------------

At December 31, 1997, the Company had 3,672 full-time employees, compared with
3,327 at December 31, 1996. The increase in employees was primarily due to the
acquisition of most of the BoA Hawaii operations. At December 31, 1997 and 1996,
HEI had 50 full-time employees.

HECO

At December 31, 1997, HECO and its subsidiaries had 2,115 full-time employees,
compared with 2,152 at December 31, 1996.

The current collective bargaining agreement between the International
Brotherhood of Electrical Workers (IBEW), Local 1260, and HECO, MECO and HELCO,
covering approximately 63% of the total employees of these companies, was
extended in November 1995 for a two-year period from November 1, 1996 through
October 31, 1998. The extension provided for noncompounded wage increases of 3%
on November 1 of each year during the term of the agreement. The IBEW and HECO,
MECO and HELCO are currently in negotiations.

The current benefits agreement between IBEW, Local 1260 and HECO, MECO and HELCO
was also extended for a two-year period and will be in effect until October 31,
1998.

                                       36
<PAGE>
 
HTB

HTB and YB have a collective bargaining agreement with the Inlandboatmen's Union
of the Pacific (IBU) effective from July 26, 1995 through July 25, 1998. A 2.5%
across-the-board wage increase was effective for the first year, with 3% in the
second and third years. Journeyman craftsmen were not included in this new
contract but were covered in YB's contract with the International Longshoremen's
and Warehousemen's Union (ILWU), Hawaii Division, Local 142. The agreement
covers all unionized employees of HTB and YB employed on ocean, interisland and
harbor tug operations and dispatchers. It excludes office clerical employees,
professional and management employees, guards and watchmen.

YB has a collective bargaining agreement covering the period of July 1, 1996
through June 30, 1999 with the ILWU, Hawaii Division, Local 142. The agreement
provides for a 13.4% wage increase over the three-year period. The agreement
covers all regularly scheduled employees, receiving and delivery clerks on the
dock loading and discharging vessels, all maintenance personnel, documentation
clerks and customer service representatives employed by YB in the state. The
agreement excludes professional employees, supervisory employees, guards and
other clerical personnel.

OTHER

The employees of HEI and its direct and indirect subsidiaries are not covered by
any collective bargaining agreement, except as identified above.

DESCRIPTION OF HEI CAPITAL STOCK
- --------------------------------

The following supplements and restates the description of HEI's Common Stock and
Preferred Stock, the related rights of stockholders under the Stockholder Rights
Plan adopted by the Board of Directors of HEI on October 28, 1997, and other
related matters, for the purpose of updating the description thereof in
registration statements filed by HEI under the Securities Exchange Act of 1934
and the Securities Act of 1933.

Under HEI's Restated Articles of Incorporation (the "Articles"), HEI is
authorized to issue 100,000,000 shares of Common Stock without par value
("Common Stock") and 10,000,000 shares of Preferred Stock without par value
("Preferred Stock"). The Board of Directors has authorized and designated only
one series of Preferred Stock, being 500,000 shares of the Series A Junior
Participating Preferred Stock, but no shares of such series have been issued,
and no shares of such series are expected to be issued, unless the Rights
described below under "Stockholder Rights Plan" become exercisable and are
exercised. Upon issuance of any shares of the Series A Junior Preferred Stock,
the rights of the holders of Common Stock of HEI will be affected as described
below in the description of the Series A Junior Participating Preferred Stock.

COMMON STOCK

General.  The outstanding shares of HEI's Common Stock are fully paid and
nonassessable. Additional shares of Common Stock, when issued, will be fully
paid and nonassessable when the consideration for which HEI's Board of Directors
authorizes their issuance has been received. The holders of Common Stock have no
preemptive rights and there are no conversion, redemption or sinking fund
provisions applicable thereto. The Common Stock is listed on the New York Stock
Exchange and is traded under the symbol HE. HEI's Common Stock is transferable
at the Stock Transfer Office of HEI, 900 Richards Street, Honolulu, Hawaii
96813, and at the office of Continental Stock Transfer & Trust Company, Co-
Transfer Agent and Registrar, 2 Broadway, New York, New York 10004.

Dividend rights. Stock and cash dividends may be paid to the holders of Common
Stock as and when declared by the Board of Directors, provided that, after
giving effect thereto, HEI is able to pay its debts as they become due in the
usual course of its business and HEI's total assets are not less than the sum of
its total liabilities plus the maximum amount that would be payable in any
liquidation in respect to all outstanding shares having preferential rights in
liquidation. All shares of Common Stock will participate equally with respect to
dividends. HEI's ability to pay dividends is now and in the future may be
limited by the restrictions and limitations now and hereafter to be set forth in
debt instruments, guarantees and resolutions creating series of Preferred Stock.

Liquidation rights.  In the event of any liquidation, dissolution, receivership,
bankruptcy, disincorporation or winding up of the affairs of the Company,
voluntarily or involuntarily, holders of HEI's Common Stock are entitled to any
assets of HEI available for distribution to HEI's stockholders 

                                       37
<PAGE>
 
after the payment in full of any preferential amounts to which holders of any
Preferred Stock may be entitled. All shares of Common Stock will rank equally in
the event of liquidation.

Voting rights.  Holders of Common Stock are entitled to one vote per share,
subject to such limitation or loss of right as may be provided in resolutions
which may be adopted from time to time creating issues of Preferred Stock or
otherwise. At annual and special meetings of stockholders, a majority of the
outstanding shares of Common Stock constitute a quorum and the affirmative vote
of a majority of such quorum so present is sufficient to approve of any action
except as otherwise required by law, except with respect to the amendment of
certain provisions of HEI's By-laws and except as may be provided in resolutions
which may be adopted from time to time creating series of Preferred Stock.

Under HEI's current By-laws, one-third (as nearly as possible) of the total
number of directors is elected at each annual meeting of stockholders and no
holder of Common Stock is entitled to cumulate votes in an election of directors
so long as HEI shall have a class of securities registered pursuant to the
Exchange Act which are listed on a national securities exchange or traded over-
the-counter on the National Association of Securities Dealers, Inc. Automated
Quotation System. Under HEI's By-laws, directors may be removed from office only
for cause.

An amendment to the provisions in the By-laws relating to (1) matters which may
be brought before an annual meeting, (2) matters which may be brought before a
special meeting, (3) cumulative voting, (4) the number and staggered terms of
members of the Board of Directors, (5) removal of directors and (6) amendment of
the By-laws must in each case be approved either (a) by the affirmative vote of
80% of the shares entitled to vote generally with respect to election of
directors voting together as a single class, or (b) by the affirmative vote of a
majority of the entire Board of Directors plus a concurring vote of a majority
of the "continuing directors" (as that term is defined in Article XVIII of the
By-laws) voting separately and as a subclass of directors.

The provisions of HEI's By-laws referred to in the foregoing two paragraphs, and
the Stockholder Rights Plan and statutory provisions referred to below, may have
the effect of delaying, deferring or preventing a change in control of HEI.

Stockholder Rights Plan. On October 28, 1997, the Board of Directors of HEI
adopted a Stockholder Rights Plan and declared a dividend of one Right for each
share of Common Stock of HEI to stockholders of record on November 10, 1997 (the
"Record Date"). As of the Record Date there were 31,734,028 shares of Common
Stock outstanding. A Right will also attach to each share of Common Stock issued
between the Record Date and the Distribution Date (as such term is defined
below). Each Right will entitle the registered holder to purchase from HEI a
unit (a "Unit") consisting of one one-hundredth of a share of Series A Junior
Participating Preferred Stock without par value (the "Series A Preferred
Stock"), at a purchase price of $112 per Unit (the "Purchase Price"), subject to
adjustment.  The description and terms of the Rights are set forth in the Rights
Agreement (the "Rights Agreement"), dated as of October 28, 1997, between HEI
and Continental Stock Transfer & Trust Company, as Rights Agent (the "Rights
Agent").  HEI's rights plan is designed to deter coercive or unfair takeover
tactics, including the gradual accumulation of shares in the open market,
partial or two-tiered tender offers, and private transactions through which an
acquiror gains control of HEI without offering fair value to all of HEI's
stockholders.

Until the Distribution Date (as defined below), (i) no separate Rights
Certificates will be distributed and the Rights will be evidenced by the Common
Stock certificates and will be transferred with and only with such Common Stock
certificates, (ii) new Common Stock certificates will contain a notation
incorporating the Rights Agreement by reference and (iii) the surrender for
transfer of any certificates for Common Stock outstanding will also constitute
the transfer of the Rights associated with the Common Stock represented by such
certificate. The Rights will separate from the Common Stock upon the earlier of
(i) 10 days following a public announcement that a person or group of affiliated
or associated persons (an "Acquiring Person") has acquired, or obtained the
right to acquire, beneficial ownership of 15% or more of the outstanding shares
of Common Stock other than as a result of repurchases of stock by HEI (the
"Stock Acquisition Date") or (ii) 10 days following the commencement of a tender
offer or exchange offer that would result in a person or group becoming an
Acquiring Person (the earlier of (i) and (ii), the "Distribution Date").  As
soon as practicable after the Distribution Date, Rights Certificates will be
mailed to holders of record of the Common Stock as of the close of business on
the Distribution Date and, thereafter, the separate Rights Certificates alone
will represent the Rights.  

                                       38
<PAGE>
 
Except as otherwise determined by the Board of Directors, only shares of Common
Stock issued prior to the Distribution Date will have Rights attached.

The Rights are not exercisable until the Distribution Date and will expire at
the close of business on November 1, 2007 unless earlier redeemed by HEI as
described below.  At no time will the Rights have any voting power.

In the event a person becomes an Acquiring Person, each holder of a Right will
thereafter have the right to receive, upon exercise, Common Stock (or, in
certain circumstances, cash, property or other securities of HEI), having a
value equal to two times the Exercise Price of the Right. Notwithstanding any of
the foregoing, following the occurrence of the event set forth in this paragraph
(the "Flip-in Event"), all Rights that are, or (under certain circumstances
specified in the Rights Agreement) were, beneficially owned by any Acquiring
Person will be null and void. However, Rights are not exercisable following the
occurrence of the Flip-in Event set forth above until such time as the Rights
are no longer redeemable by HEI as set forth below.

In the event that following the Stock Acquisition Date, (i) HEI engages in a
merger or business combination transaction in which HEI is not the surviving
corporation; (ii) HEI engages in a merger or business combination transaction in
which HEI is the surviving corporation and the Common Stock of HEI is changed or
exchanged; or (iii) 50% or more of HEI's assets or earning power is sold or
transferred (all deemed "Flip-Over Events"), each holder of a Right (except
Rights which have previously been voided as set forth above) shall thereafter
have the right to receive, upon exercise of the Right, Common Stock of the
acquiring company having a value equal to two times the Exercise Price of the
Right.

The Purchase Price payable, and the number of Units of Series A Preferred Stock
or other securities or property issuable upon exercise of the Rights are subject
to adjustment from time to time to prevent dilution (i) in the event of a stock
dividend on, or a subdivision, combination or reclassification of, the Series A
Preferred Stock, (ii) if holders of the Series A Preferred Stock are granted
certain rights or warrants to subscribe for preferred stock or convertible
securities at less than the current market price of the Series A Preferred
Stock, or (iii) upon the distribution to holders of the Series A Preferred Stock
of evidences of indebtedness or assets (excluding regular quarterly cash
dividends) or of subscription rights or warrants (other than those referred to
above).

At any time until ten days following the Stock Acquisition Date, HEI may redeem
the Rights in whole, but not in part, at a price of $0.01 per Right. Immediately
upon the action of the Board of Directors ordering redemption of the Rights, the
Rights will terminate and the only right of the holders of Rights will be to
receive the redemption price of $0.01 per Right.

Until a Right is exercised, the holder thereof, as such, will have no rights as
a preferred stockholder of HEI, including, without limitation, the right to vote
or to receive dividends.

Prior to the Distribution Date, HEI may supplement or amend any provision of the
Rights Agreement. After the Distribution Date, the provisions of the Rights
Agreement may be supplemented or amended by the Board in order to cure any
ambiguity, to make changes which do not materially adversely affect the
interests of holders of Rights (excluding the interest of any Acquiring Person),
to correct or supplement any defective or inconsistent provision in the Rights
Agreement, or to shorten or lengthen any time period under the Rights Agreement;
provided, however, that from and after the Distribution Date, no amendment to
lengthen the time period governing redemption shall be made unless such
lengthening is for the purpose of protecting, enhancing or clarifying the rights
of, and/or the benefits to, the holders of Rights.  The Rights Agreement may not
be amended at a time when the Rights are not redeemable.

Restriction on Purchases of Shares and Consequences of Substantial Holdings of
Shares under Certain Hawaii and Federal Laws. Provisions of Hawaii and Federal
law, some of which are described below, place restrictions on the acquisition of
beneficial ownership of 5% or more of the voting power of HEI.  The following
does not purport to be a complete enumeration of all such provisions, nor does
it purport to be a complete description of the statutory provisions that are
enumerated.  Persons contemplating the acquisition of 5% or more of the issued
and outstanding shares of HEI's Common Stock should consult with their legal and
financial advisors concerning statutory and other restrictions on such
acquisitions.

The Hawaii Control Share Acquisition Act places restrictions on the acquisition
of ranges of voting power (starting at 10% and at 10% intervals up to a
majority) for the election of directors of HEI unless 

                                       39
<PAGE>
 
the acquiring person obtains approval of the acquisition, in the manner
specified in the Act, by the affirmative vote of the holders of a majority of
the voting power of all shares entitled to vote, exclusive of the shares
beneficially owned by the acquiring person, and consummates the proposed control
share acquisition within 180 days after shareholder approval. If such approval
is not obtained, the statute provides that the shares acquired may not be voted
for a period of one year from the date of acquisition, the shares will be
nontransferable on HEI's books for one year after acquisition and HEI, during
the one-year period, shall have the right to call the shares for redemption
either at the prices at which the shares were acquired or at book value per
share as of the last day of the fiscal quarter ended prior to the date of the
call for redemption.

Under provisions of the Hawaii Business Corporation Act, subject to certain
exceptions, HEI may not be a party to a merger or consolidation unless the
merger or consolidation is approved by the holders of at least 75% of all of the
issued and outstanding voting stock of HEI.

Under provisions of Hawaii law regulating public utilities, not more than 25% of
the issued and outstanding voting stock of certain public utility corporations,
including Hawaiian Electric Company, Inc. ("HECO") and its wholly owned electric
utility subsidiaries, may be held, directly or indirectly, by any single foreign
corporation or any single nonresident alien, or held by any person, without the
prior approval of the PUC. The acquisition of more than 25% of the issued and
outstanding voting stock of HEI in one or more transactions might be deemed to
result in the holding of more than 25% of the voting stock of HECO and its
electric utility subsidiaries. In addition, HEI is subject to an agreement ("the
PUC Agreement") entered into with the PUC when HECO became a wholly owned
subsidiary of HEI. The PUC Agreement provides that the acquisition of HEI by a
third party, whether by purchase, merger, consolidation or otherwise, requires
the prior written approval of the PUC.

Under the Hawaii Environmental Disclosure Law, a person and that person's
affiliates who in the aggregate beneficially own 10% or more but less than 50%
of the securities entitled to vote for the election of directors of HEI may not
acquire more than 5% of such securities during any 12-month period without first
filing an environmental disclosure statement with the Hawaii Office of
Environmental Quality Control.

Under the Public Utility Holding Company Act of 1935 (the "1935 Act"), any
company (as defined in the 1935 Act) which owns, controls or holds with power to
vote 10% or more of the outstanding voting securities of HEI may be a public
utility holding company, subject to regulation under the 1935 Act, unless an
exemption is available under the 1935 Act or the Securities and Exchange
Commission (the "SEC"), upon application, declares such a company not to be a
holding company. In addition, under the 1935 Act, no person or company may,
without prior approval of the SEC, acquire 5% or more of the outstanding Common
Stock or other voting securities of HEI as long as HECO remains an HEI public
utility subsidiary and a public utility holding company.

The Savings and Loan Holding Company Act, the Change in Bank Control Act and the
Office of Thrift Supervision ("OTS") regulations place restrictions on certain
types of acquisitions of control of a savings bank and its holding company.
Generally, no company, or any director or officer of a savings and loan holding
company, or person who owns, or controls or holds with power to vote more than
25% of the voting stock of such holding company, may acquire control of a
savings bank insured by the Federal Deposit Insurance Corporation or its holding
company, without the prior written approval of the OTS. In addition, no person
(other than certain persons affiliated with a savings and loan holding company)
may acquire control of a savings bank or savings and loan holding company,
unless the OTS has been given 60 days' prior written notice of the acquisition
and has not objected to it. As a result of HEI's indirect ownership of American
Savings Bank, F.S.B. ("ASB"), the acquisition of control of HEI, HEI
Diversified, Inc. ("HEIDI") or ASB may be subject to the requirement of prior
written OTS approval or 60 days' prior written notice to the OTS, unless such
transaction would be exempt from such requirements under federal law or
regulation. "Control" in this context means the acquisition of, control of, or
holding proxies representing, more than 25% of the voting shares of HEI, HEIDI
or ASB, or the power to control in any manner the election of a majority of the
directors thereof. Moreover, under OTS regulations, one would be determined,
subject to rebuttal, to have acquired control if one acquires more than 10% of
the voting shares of HEI, HEIDI or ASB and is subject to one of certain
specified "control factors." Anyone acquiring more than 10%, or additional stock
above 10%, of any class of shares of HEI, HEIDI or ASB is required to file a
certification with the OTS.

                                       40
<PAGE>
 
Under the Jones Act, it is unlawful to transport merchandise between points in
the U.S. except in vessels owned by U.S. citizens. For a corporation to
demonstrate U.S. citizenship, it must be incorporated under the laws of the
United States or a state thereof, its chief executive officer and board chairman
must be U.S. citizens, a majority of its directors must be U.S. citizens and at
least 75% of its voting stock must be owned by U.S. citizens. If less than 75%
of the Common Stock of HEI (which is the only class of voting stock presently
outstanding) is owned by U.S. citizens, the vessels of HTB and YB would not be
permitted to engage in transport between points in Hawaii.

Dividend Reinvestment and Stock Purchase Plan. Any individual of legal age or
entity is eligible to participate in the HEI Dividend Reinvestment and Stock
Purchase Plan (the "Plan")  by making an initial cash investment in Common
Stock, subject to applicable laws and regulations and the requirements of the
Plan. Holders of Common Stock, and preferred stock of HEI's electric utility
subsidiaries (HECO, MECO and HELCO), may automatically reinvest some or all of
their dividends to purchase additional shares of Common Stock at market prices
(as defined in the Plan). Participants in the Plan may also purchase additional
shares of Common Stock at market prices (as defined in the Plan) by making cash
contributions to the Plan. HEI reserves the right to suspend, modify or
terminate the Plan at any time. Shares of Common Stock issued under the Plan may
either be newly issued shares or shares purchased by the Plan on the open
market.  Participants do not pay brokerage commissions or service charges in
connection with purchases of newly issued shares, but do pay their pro rata
share of brokerage commissions if the shares are purchased by the Plan for
participants on the open market.

PREFERRED STOCK

Authorized Preferred Stock. Preferred Stock may be issued by the Board of
Directors in one or more series, without action by stockholders and with such
preferences, voting powers, restrictions and qualifications as may be fixed by
resolution of the Board of Directors authorizing the issuance of such shares.
Under current Hawaii law, the terms and provisions of all shares of Preferred
Stock must be identical except with respect to dividend rates, redemption and
redemption prices, amounts payable in liquidation, sinking fund provisions,
conversion privileges, if any, and voting rights, if any.

If and when authorized by the Board of Directors, any such Preferred Stock may
be preferred as to dividends or in liquidation, or both, over the Common Stock.
For example, the terms of the Preferred Stock, if and when authorized, could
prohibit dividends on shares of Common Stock until all dividends and any
mandatory redemptions have been paid with respect to shares of Preferred Stock.
In addition, the Board of Directors may, without stockholder approval, issue
Preferred Stock with voting and conversion rights which could adversely affect
the voting power or economic rights of the holders of Common Stock. Issuance of
Preferred Stock by HEI could thus have the effect of delaying, deferring or
preventing a change of control of HEI. The first and only series of Preferred
Stock that has been authorized by the Board of Directors as of the date hereof
is the Series A Junior Participating Preferred Stock.

Series A Junior Participating Preferred Stock. On October 28, 1997, the Board of
Directors of HEI authorized a series of 500,000 shares of Preferred Stock,
designated the Series A Junior Participating Preferred Stock. The Series A
Junior Participating Preferred Stock is without par value, and was created in
conjunction with the Board's adoption of the Rights Agreement between HEI and
Continental Stock Transfer & Trust Company, as Rights Agent. No shares of Series
A Junior Participating Preferred Stock have been issued. The Series A Junior
Participating Preferred Stock may be purchased under certain circumstances, as
set forth in the Rights Agreement. The exercise price for one one-hundredth of a
share of Series A Junior Participating Preferred Stock is $112, subject to
adjustment.

The Series A Junior Participating Preferred Stock ranks junior to all other
series of Preferred Stock as to the payment of dividends and distribution of
assets, unless the terms of any such series provide otherwise.  If declared by
the Board of Directors out of funds legally available therefor, the dividend
rate for the Series A Junior Participating Preferred Stock is the greater of
$61.00 per quarter, or 100 times the then current quarterly dividend per common
share (as adjusted from time to time to reflect stock dividends, subdivisions or
combinations). Whenever quarterly dividends on the Series A Junior Participating
Preferred Stock are in arrears, dividends or other distributions may not be made
on the Common Stock or on any series of Preferred Stock ranking junior to the
Series A Junior Participating Preferred Stock. Upon liquidation, no holders of
shares ranking junior to the Series A Junior Participating Preferred Stock shall
receive any distribution until all holders of the Series A Junior Participating
Preferred Stock shall have received $100 per share, plus any unpaid dividends
(the "Series A Liquida-

                                       41
<PAGE>
 
tion Preference"). Following payment of the Series A Liquidation Preference, no
additional distributions shall be made to the holders of Series A Junior
Participating Preferred Stock unless holders of Common Stock receive an amount
equal to the Series A Liquidation Preference divided by 100, as adjusted, and
thereafter (and after taking into account any amounts that may then be due to
holders of any other series of Preferred Stock) the holders of the Series A
Junior Participating Preferred Stock shall be entitled to share in the remaining
assets of HEI with the holders of the Common Stock, ratably on a per share
basis. In the event that there are not sufficient assets available to permit
payment in full of the Series A Liquidation Preference and the liquidation
preferences of all other series of Preferred Stock, if any, which rank on a
parity with the Series A Junior Participating Preferred Stock, then such
remaining assets shall be distributed ratably to the holders of such parity
shares in proportion to their respective liquidation preferences.

Each share of Series A Junior Participating Preferred Stock shall entitle the
holder thereof to 100 votes, as may be adjusted from time to time, on all
matters submitted to a vote of the stockholders of HEI, voting together with the
Common Stock. If dividends on any Series A Junior Participating Preferred Stock
are in arrears in an amount equal to six quarterly dividends, then until
dividends for all previous quarters and for the current quarter have been
declared and paid or set aside for payment, the holders of Series A Junior
Participating Preferred Stock, voting as a class with holders of other series of
Preferred Stock who are then entitled to vote thereon, shall also have the right
to elect two directors to HEI's Board of Directors.  The shares of Series A
Junior Participating Preferred Stock are not redeemable.

ITEM 2.   PROPERTIES

HEI leases office space from a nonaffiliated lessor in downtown Honolulu and
- ---                                                                         
this lease expires on March 31, 2001. HEI also leases office space from HECO in
downtown Honolulu. The properties of HEIOs subsidiaries are as follows:

ELECTRIC UTILITY
- ----------------

See page 5 for the "Generation statistics" of HECO and its subsidiaries,
including generating and firm purchased capability, reserve margin and annual
load factor.

HECO owns and operates three generating plants on the island of Oahu at
- ----                                                                   
Honolulu, Waiau and Kahe, with an aggregate generating capability of 1,263 MW at
December 31, 1997. The three plants are situated on HECO-owned land having a
combined area of 535 acres. In addition, HECO owns a total of 127 acres of land
on which are located substations, transformer vaults, distribution baseyards and
the Kalaeloa cogeneration facility.

Electric lines are located over or under public and nonpublic properties. Most
of HECO's leases, easements and licenses have been recorded.

HECO owns overhead transmission lines, overhead distribution lines, underground
cables, fully owned or jointly owned poles and steel or aluminum high voltage
transmission towers. The transmission system operates at 46,000 and 138,000
volts. The total capacity of HECO's transmission and distribution substations
was 6,411,000 kilovoltamperes at December 31, 1997.

HECO owns a building and approximately 11.5 acres of land located in Honolulu
which houses its operating, engineering and information services departments and
a warehousing center. It also leases an office building and certain office
spaces in Honolulu. The lease for the office building expires in November 2004,
with an option to further extend the lease to November 2012. The leases for
certain office spaces expire on various dates through November 30, 2004 with
options to extend to various dates through November 30, 2014.

HECO owns 19.2 acres of land at Barbers Point used to situate fuel oil storage
facilities with a combined capacity of 970,700 barrels. HECO also owns fuel oil
tanks at each plant site with a total maximum usable capacity of
844,600 barrels.

MECO owns and operates two generating plants on the island of Maui, at Kahului
- ----                                                                          
and Maalaea, with an aggregate capability of 191.5 MW as of December 31, 1997.
The plants are situated on MECO-owned land having a combined area of 28.6 acres.
MECO also owns fuel oil storage facilities at these sites with a total maximum
usable capacity of 172,000 barrels.

MECO's administrative offices and engineering and distribution departments are
located on 9.1 acres of MECO-owned land in Kahului.

                                       42
<PAGE>
 
MECO also owns and operates smaller distribution and generation systems on the
islands of Lanai and Molokai.

HELCO owns and operates five generating plants on the island of Hawaii. These
- -----                                                                        
plants at Hilo (2), Waimea, Kona and Puna have an aggregate generating
capability of 157.4 MW as of December 31, 1997 (excluding two small run-of-river
hydro units and one small windfarm). The plants are situated on HELCO-owned land
having a combined area of approximately 43 acres. HELCO also owns 6.0 acres of
land in Kona, which is used for a baseyard, and it leases 4.0 acres of land for
its baseyard in Hilo. The lease expires in 2030. The deeds to the sites located
in Hilo contain certain restrictions which do not materially interfere with the
use of the sites for public utility purposes. HELCO leases 78 acres of land for
the windfarm.

The properties of HELCO are subject to a first mortgage securing HELCO's
outstanding first mortgage bonds, which amounted to $5 million as of December
31, 1997.

SAVINGS BANK
- ------------

ASB owns its executive office building located in downtown Honolulu and land and
- ---                                                                             
an office building in the Mililani Technology Park on Oahu.

The following table sets forth certain information with respect to branches
owned and leased by ASB and its subsidiaries at December 31, 1997.

<TABLE>
<CAPTION>
                                                                        Number of branches
                                                      ---------------------------------------------------
                                                             Owned            Leased           Total
- ---------------------------------------------------------------------------------------------------------
<S>                                                      <C>              <C>              <C>
Oahu..................................................               11               37               48
Maui..................................................                3                4                7
Kauai.................................................                3                3                6
Hawaii................................................                2                5                7
Molokai...............................................               --                1                1
                                                      ---------------------------------------------------
                                                                     19               50               69
                                                      ===================================================
</TABLE>

The net book value of branches and office facilities is approximately $49
million. Of this amount, $39 million represents the net book value of the land
and improvements for the branches and office facilities owned by ASB and $10
million represents the net book value of ASB's leasehold improvements.

OTHER
- -----

FREIGHT TRANSPORTATION
- ----------------------

HTB owned seven tugboats ranging from 1,430 to 3,400 HP, two tenders (auxiliary
boats) of 500 HP and two flatdecked barges as of December 31, 1997.

HTB owns no real property, but rents on a month-to-month basis its pier property
used in its operations from the State of Hawaii under a revocable permit.

YB, HTB's subsidiary, owned five tugboats, two doubledecked and seven flatdecked
barges and most of its shoreside equipment, including 20-foot containers,
chassis, 20-foot and 40-foot refrigerated containers, container vans, hi-lifts,
flatracks, automobile racks and other related equipment as of December 31, 1997.

YB owns no real property, but rents on a month-to-month basis or leases various
pier properties and warehouse facilities from the State of Hawaii under
revocable permits or five-year leases. It is expected that leases will be
renegotiated as necessary.

REAL ESTATE DEVELOPMENT
- -----------------------

MPC.  See Item 1, "Business--Other--Real estate--Malama Pacific Corp." MDC,
MPC's subsidiary, owns land adjacent to HECO's Ward Avenue facility on Oahu. In
1996, the sale of 0.23 acres of the property was completed. The remaining 1.04
acres is leased to HECO and other commercial tenants.

OTHER
- -----

HEIIC.  See Item 1, "Business--Other--HEI Investment Corp."

                                       43
<PAGE>
 
As of March 17, 1998, HEIPC leases office space in downtown Honolulu. HEIPC also
operates generating units at a facility in Tanguisson, Guam. See Item 1,
"Business--Other--HEI Power Corp."

ITEM 3.   LEGAL PROCEEDINGS

Except as provided for below and in "Item 1. Business," there are no known
material pending legal proceedings, other than ordinary routine litigation
incidental to their respective businesses, to which HEI or any of its
subsidiaries is a party or of which any of their property is the subject.

DISCONTINUED OPERATIONS
- -----------------------

See Note 20 to HEI's Consolidated Financial Statements, incorporated herein by
reference to page 63 of HEI's 1997 Annual Report to Stockholders, portions of
which are filed herein as HEI Exhibit 13.

In December 1994, five insurance agencies, which had served as insurance agents
for the HIG Group, filed a complaint against HEI, HEIDI and others. The
complaint set forth several causes of action, including breach of contract and
piercing the corporate veil. The plaintiffs asked for relief from the
defendants, including compensatory damages for lost commissions, business and
profits, and punitive damages. In 1995, the court granted defendants' motion for
summary judgment dismissing all claims. Judgment has been entered, plaintiffs
have appealed and all appellate briefs have been filed. In the opinion of
management, losses, if any, resulting from the ultimate outcome of the lawsuit
will not have a material adverse effect on the Company's financial condition,
results of operations or liquidity.

ITEM 4.    SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

HEI and HECO:

During the fourth quarter of 1997, no matters were submitted to a vote of
security holders of the Registrants.

EXECUTIVE OFFICERS OF HEI

The following persons are, or may be deemed, executive officers of HEI. Their
ages are given as of February 18, 1998 and their years of company service are
given as of December 31, 1997. Officers are appointed to serve until the meeting
of the HEI Board of Directors after the next Annual Meeting of Stockholders
(which will occur on April 28, 1998) and/or until their successors have been
appointed and qualified (or until their earlier resignation or removal). Company
service includes service with an HEI subsidiary.


<TABLE>
<CAPTION>
                                                                                  Business experience
HEI Executive Officers                                                            for past five years
- ------------------------------------------------------------------------------------------------------
<S>                                                                              <C>
Robert F. Clarke, age 55
  President and Chief Executive Officer............................................    1/91 to date
  Director.........................................................................    4/89 to date
  (Company service: 10 years)

T. Michael May, age 51
  Senior Vice President and Director...............................................    9/95 to date
  (Company service: 5 years)
  Mr. May is also President and Chief Executive Officer of HECO and served as
   HECO Senior Vice President from 2/92 to 8/95.

Robert F. Mougeot, age 55
  Financial Vice President and Chief Financial Officer.............................    4/89 to date
  (Company service: 9 years)

Peter C. Lewis, age 63
  Vice President - Administration..................................................    10/89 to date
  (Company service: 29 years)

Charles F. Wall, age 58
  Vice President and Corporate Information Officer.................................    7/90 to date
  (Company service: 7 years)
</TABLE>

                                       44
<PAGE>
 
<TABLE>
<CAPTION>
                                                                                  Business experience
HEI Executive Officers                                                            for past five years
- ------------------------------------------------------------------------------------------------------
(continued)
<S>                                                                              <C>

Andrew I. T. Chang, age 58
  Vice President - Government Relations.......................................   4/91 to date
  (Company service: 13 years)
 
Constance H. Lau, age 45
  Treasurer...................................................................   4/89 to date
  (Company service: 13 years)
 
Curtis Y. Harada, age 42
  Controller..................................................................   1/91 to date
  (Company service: 8 years)
 
Betty Ann M. Splinter, age 52
  Secretary...................................................................   10/89 to date
  (Company service: 23 years)
 
Wayne K. Minami, age 55
  President and Chief Executive Officer, American Savings Bank, F.S.B.........   1/87 to date
  (Company service: 11 years)
</TABLE>

HEI's executive officers, with the exception of Charles F. Wall and Andrew I. T.
Chang, are officers and/or directors of one or more of HEI's subsidiaries. Mr.
Minami is deemed an executive officer of HEI for purposes of this Item under the
definition of Rule 3b-7 of the SEC's General Rules and Regulations under the
Securities Exchange Act of 1934.

There are no family relationships between any executive officer of HEI and any
other executive officer or director of HEI, or any arrangement or understanding
between any executive officer and any person pursuant to which the officer was
selected.


                                    PART II
                                    -------

ITEM 5.   MARKET FOR REGISTRANTS' COMMON EQUITY AND RELATED STOCKHOLDER MATTERS

HEI:

The information required by this item is incorporated herein by reference to
pages 62 and 65 (Note 18, "Regulatory restrictions on net assets" and Note 23,
"Quarterly information (unaudited)" to HEI's Consolidated Financial Statements)
and page 25 of HEI's 1997 Annual Report to Stockholders, portions of which are
filed herein as HEI Exhibit 13. Certain restrictions on dividends and other
distributions of HEI are described in this report under "Item 1. Business--
Regulation and other matters--Restrictions on dividends and other
distributions." The total number of holders of record of HEI common stock as of
March 13, 1998, was 20,146.

HECO:

The information required with respect to "Market information" and "holders" is
not applicable. Since the corporate restructuring on July 1, 1983, all the
common stock of HECO has been held solely by its parent, HEI, and is not
publicly traded.

                                       45
<PAGE>
 
The dividends declared and paid on HECO's common stock for the four quarters of
1997 and 1996 were as follows:

<TABLE>
<CAPTION>
                     Quarters ended                             1997              1996
- --------------------------------------------------------------------------------------------
<S>                                                        <C>               <C>
March 31................................................       $15,062,000       $11,054,000
June 30.................................................        12,873,000        13,154,000
September 30............................................        13,586,000        14,916,000
December 31.............................................        16,856,000        17,879,000
</TABLE>

The discussion of regulatory restrictions on net assets is incorporated herein
by reference to page 29 (Note 13 to HECO's Consolidated Financial Statements,
"Regulatory restrictions on distributions to parent") of HECO's 1997 Annual
Report to Stockholder, portions of which are filed herein as HECO Exhibit 13.

ITEM 6.    SELECTED FINANCIAL DATA

HEI:

The information required by this item is incorporated herein by reference to
page 25 of HEI's 1997 Annual Report to Stockholders, portions of which are filed
herein as HEI Exhibit 13.

HECO:

The information required by this item is incorporated herein by reference to
page 2 of HECO's 1997 Annual Report to Stockholder, portions of which are filed
herein as HECO Exhibit 13.

ITEM 7.       MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
and ITEM 7A.  CONDITION AND RESULTS OF OPERATIONS AND QUANTITATIVE
              AND QUALITATIVE DISCLOSURES ABOUT MARKET RISKS

HEI:

The information required by this item is set forth in HEI's MD&A, incorporated
herein by reference to pages 27 to 39 of HEI's 1997 Annual Report to
Stockholders, portions of which are filed herein as HEI Exhibit 13.

HECO:

The information required by this item is set forth in HECO's MD&A, incorporated
herein by reference to pages 3 to 11 of HECO's 1997 Annual Report to
Stockholder, portions of which are filed herein as HECO Exhibit 13. HECO is not
required to provide "Quantitative and Qualitative Disclosures About Market
Risks" in this Form 10-K.

ITEM 8.   FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

HEI:

The information required by this item is incorporated herein by reference to the
section entitled "Segment financial information" on page 26 and to pages 40 to
65 of HEI's 1997 Annual Report to Stockholders, portions of which are filed
herein as HEI Exhibit 13.

HECO:

The information required by this item is incorporated herein by reference to
pages 12 to 34 of HECO's 1997 Annual Report to Stockholder, portions of which
are filed herein as HECO Exhibit 13.

ITEM 9.    CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
          FINANCIAL DISCLOSURE

HEI and HECO:

None

                                       46
<PAGE>
 
                                    PART III
                                    --------

ITEM 10.    DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANTS

HEI:

Information for this item concerning the executive officers of HEI is set forth
on pages 44 and 45 of this report. The list of current directors of HEI is
incorporated herein by reference to page 66 of HEI's 1997 Annual Report to
Stockholders, portions of which are filed herein as HEI Exhibit 13. Information
on the current directors' business experience and directorships is incorporated
herein by reference to pages 4 to 6 of HEI's Definitive Proxy Statement,
prepared for the Annual Meeting of Stockholders to be held on April 28, 1998.

There are no family relationships between any director of HEI and any other
executive officer or director of HEI, or any arrangement or understanding
between any director and any person pursuant to which the director was selected.

The information required under this item by Item 405 of Regulation S-K is
incorporated by reference to page 11 of HEI's Definitive Proxy Statement,
prepared for the Annual Meeting of Stockholders to be held on April 28, 1998.

HECO:

The following persons are, or may be deemed, executive officers of HECO. Their
ages are given as of February 18, 1998 and their years of company service are
given as of December 31, 1997. Officers are appointed to serve until the meeting
of the HECO Board of Directors after the next HECO Annual Meeting (which will
occur on April 28, 1998) and/or until their respective successors have been
appointed and qualified (or until their earlier resignation or removal). Company
service includes service with HECO affiliates.

<TABLE>
<CAPTION>
                                                                                   Business experience
HECO Executive Officers                                                            for past five years
- --------------------------------------------------------------------------------------------------------
<S>                                                                               <C>
Robert F. Clarke, age 55
  Chairman of the Board........................................................   1/91 to date
  (Company service: 10 years)
 
T. Michael May, age 51
  President, Chief Executive Officer and Director..............................   9/95 to date
  Senior Vice President........................................................   2/92 to 8/95
  Chairman of the Board, MECO and HELCO........................................   9/95 to date
  (Company service: 5 years)
 
Jackie Mahi Erickson, age 57
  Vice President - General Counsel & Government Relations......................   9/95 to date
  Vice President - Corporate Counsel...........................................   2/91 to 8/95
  (Company service: 17 years)
 
Charles M. Freedman, age 51
  Vice President - Corporate Relations.........................................   3/98 to date
  Vice President - Corporate Excellence........................................   7/95 to 2/98
  Vice President - Corporate Relations.........................................   5/92 to 6/95
  (Company service: 7 years)
 
Edward Y. Hirata, age 64
  Vice President - Regulatory Affairs..........................................   7/95 to date
  Vice President - Planning....................................................   12/91 to 6/95
  Vice President, MECO and HELCO...............................................   12/91 to date
  (Company service: 11 years)
</TABLE>

                                       47
<PAGE>
 
<TABLE>
<CAPTION>
                                                                                   Business experience
HECO Executive Officers                                                            for past five years
- --------------------------------------------------------------------------------------------------------
(continued)
<S>                                                                                <C>
 
Thomas J. Jezierny, age 53
  Vice President - Energy Delivery.............................................   9/96 to date
  President, MECO..............................................................   4/90 to 8/96
  (Company service: 27 years)
 
Thomas L. Joaquin, age 54
  Vice President - Power Supply................................................   7/95 to date
  Vice President - Operations..................................................   5/94 to 6/95
  General Manager, Production..................................................   11/93 to 4/94
  Manager, Production..........................................................   10/92 to 10/93
  (Company service: 24 years)
 
Richard L. O'Connell, age 68
  Vice President - Customer Operations.........................................   7/95 to date
  Vice President - Customer Relations..........................................   2/91 to 6/95
  (Company service: 17 years)
 
Paul A. Oyer, age 57
  Financial Vice President and Treasurer.......................................   4/89 to date
  Director.....................................................................   4/85 to date
  Financial Vice President and Treasurer, MECO and HELCO.......................   3/85 to date
  (Company service: 31 years)
 
Patricia U. Wong, age 41
  Vice President - Corporate Excellence........................................   3/98 to date
  Manager, Environmental Department............................................   9/96 to 2/98
  Associate General Counsel, Legal Department..................................   5/90 to 9/96
  (Company service: 7 years)
 
Ernest T. Shiraki, age 50
  Controller...................................................................   5/89 to date
  (Company service: 28 years)
 
Molly M. Egged, age 47
  Secretary....................................................................   10/89 to date
  Secretary, MECO and HELCO....................................................   10/89 to date
  (Company service: 17 years)
</TABLE>

HECO's executive officers Robert F. Clarke, T. Michael May and Molly M. Egged
are also officers of one or more of the affiliated nonutility HEI companies.

There are no family relationships between any executive officer or director of
HECO and any other executive officer or director of HECO, or any arrangement or
understanding between any director and any person pursuant to which the director
was selected.

The list of current directors of HECO is incorporated herein by reference to
page 36 of HECO's 1997 Annual Report to Stockholder, portions of which are filed
herein as HECO Exhibit 13. Information on the business experience and
directorships of directors of HECO who are also directors of HEI is incorporated
herein by reference to pages 4 through 6 of HEI's Definitive Proxy Statement,
prepared for the Annual Meeting of Stockholders to be held on April 28, 1998.

Paul C. Yuen, age 69, and Anne M. Takabuki, age 41, as of February 18, 1998 are
the only outside directors of HECO who are not directors of HEI. Dr. Yuen, who
was elected a director of HECO in April 1993, is Dean of the College of
Engineering at the University of Hawaii-Manoa. In the past five years, he has
held various administrative positions at the University of Hawaii-Manoa. He also
serves on

                                       48
<PAGE>
 
the board of Cyanotech Corporation. Miss Takabuki was elected a director of HECO
in April 1997 and is Vice President/General Counsel of Wailea Golf Resort, Inc.
She also serves on the boards of MECO, Wailea Golf Resort, Inc. and its
affiliated companies and MAGBA, Inc. Information on Mr. Oyer's business
experience and directorship is indicated above.

ITEM 11.   EXECUTIVE COMPENSATION

HEI:

The information required under this item for HEI is incorporated by reference to
pages 9 to 10, 13 to 19, and 24 to 25 of HEI's Definitive Proxy Statement,
prepared for the Annual Meeting of Stockholders to be held on April 28, 1998.

HECO:

The following tables set forth the information required for the chief executive
officer of HECO and the four other most highly compensated HECO executive
officers serving at the end of 1997. All compensation amounts presented for T.
Michael May are the same amounts presented in HEI's Definitive Proxy Statement,
prepared for the Annual Meeting of Stockholders to be held on April 28, 1998.

SUMMARY COMPENSATION TABLE
- --------------------------

The following summary compensation table shows the annual and long-term
compensation of the chief executive officer of HECO and the four other most
highly compensated executive officers of HECO who served at the end of 1997.


                           SUMMARY COMPENSATION TABLE

<TABLE>
<CAPTION>
                                                                                        Long-Term
                                                Annual Compensation                    Compensation
                                         -----------------------------------   ----------------------------
                                                                                   Awards        Payouts             
                                                                    Other      -------------   ------------       All
                                                                    Annual       Securities                      Other
                                                                   Compen-       Underlying       LTIP           Compen-
    Name and Principal                   Salary      Bonus(1)      sation(2)     Options(3)     Payouts(4)      sation(5)
         Position               Year      ($)          ($)            ($)            (#)           ($)            ($)
- -------------------------------------------------------------------------------------------------------------------------
<S>                             <C>     <C>          <C>          <C>               <C>            <C>           <C>
T. Michael May.............     1997    $313,000     $     0      $      0          12,000             --        $16,423
President and Chief             1996     282,000      98,747       107,412          12,000         52,175         13,945
   Executive Officer            1995     226,000      41,987             0           4,000             na          8,177
                                                                                                   
Paul A. Oyer...............     1997     202,000           0        16,042           3,000             na          9,291
Financial Vice President        1996     196,000      19,706        14,533               0             na          8,748
   and Treasurer                1995     188,000      17,959        13,167           3,000             na          7,907
                                                                                                   
Thomas J. Jezierny.........     1997     172,000           0             0           3,000             --          5,760
Vice President-                 1996     151,000      21,524             0           3,000         19,526          4,785
   Energy Delivery              1995     135,000      14,642             0           3,000         29,204          4,320
                                                                                                   
Thomas L. Joaquin..........     1997     168,000           0             0           3,000             na          6,232
Vice President-                 1996     154,000      19,706             0               0             na          5,546
   Power Supply                 1995     137,000      17,959             0           3,000             na          4,404
                                                                                                   
Edward Y. Hirata...........     1997     149,000           0             0           3,000             na         11,084
Vice President-                 1996     144,000      18,054           135               0             na         10,381
   Regulatory Affairs           1995     140,000      16,519           270           3,000             na         10,002

na   Not applicable.
</TABLE>

                                       49
<PAGE>
 
(1) The named executive officers are eligible for an incentive award under the
    Company's annual Executive Incentive Compensation Plan (EICP). EICP bonus
    payouts are reflected as compensation for the year earned.
(2) Covers perquisites of $107,412 for Mr. May for 1996 which he recognized as
    imputed income under the Internal Revenue Code, including $95,691 under the
    category club membership (representing once in a lifetime reimbursement of
    initiation fees of $50,000 grossed up for taxes, plus reimbursement of
    monthly dues not grossed up for taxes). Amounts for Mr. Oyer and Mr. Hirata
    represent above-market earnings on deferred annual payouts.
(3) Except for Mr. May's, Mr. Oyer's, Mr. Joaquin's and Mr. Hirata's options
    granted in 1995, options granted include dividend equivalents.
(4) Long-Term Incentive Plan (LTIP) payouts are determined in the second quarter
    of each year for the three-year cycle ending on December 31 of the previous
    calendar year. If there is a payout, the amount is reflected as LTIP
    compensation in the table for the previous year for Mr. May and Mr.
    Jezierny. In April 1996, an LTIP payout was made for the 1993-1995
    performance cycle and is reflected as LTIP compensation in the table for
    1995. In May 1997, an LTIP payout was made for the 1994-1996 performance
    cycle and is reflected as LTIP compensation in the table for 1996. The
    determination of whether there will be a payout under the 1995-1997 LTIP
    will not be made until the second quarter of this year.
(5) Represents amounts accrued by the Company for certain death benefits
    provided to the named executive officers. Additional information is
    incorporated by reference to "Other Compensation Plans" on page 22 of HEI's
    Definitive Proxy Statement, prepared for the Annual Meeting of Stockholders
    to be held on April 28, 1998.

OPTION GRANTS IN LAST FISCAL YEAR
- ---------------------------------

The following table presents information on the nonqualified stock options which
were granted in 1997 to the executives named in the HECO Summary Compensation
Table. The practice of granting stock options, which may include dividend
equivalent shares, has been followed each year since 1987.


<TABLE>
<CAPTION>
                                                   OPTION GRANTS IN LAST FISCAL YEAR
                               Number of            Percent of
                              Securities           Total Options
                              Underlying            Granted to            Exercise                                 Grant Date
                                Options            Employees in             Price             Expiration             Present
                            Granted (1)(#)          Fiscal Year           ($/share)              Date             Value (2)($)
- ------------------------------------------------------------------------------------------------------------------------------
<S>                         <C>                   <C>                   <C>                 <C>                   <C>
T. Michael May...........           12,000                     8%             $34.61         April 14, 2007           $107,520
Paul A. Oyer.............            3,000                     2               34.61         April 14, 2007             26,880
Thomas J. Jezierny.......            3,000                     2               34.61         April 14, 2007             26,880
Thomas L. Joaquin........            3,000                     2               34.61         April 14, 2007             26,880
Edward Y. Hirata.........            3,000                     2               34.61         April 14, 2007             26,880
</TABLE>

(1) For the 24,000 option shares granted with an exercise price of $34.61 per
    share, additional dividend equivalent shares are granted at no additional
    cost throughout the four-year vesting period (vesting in equal installments)
    which begins on the date of grant. Dividend equivalents are computed, as of
    each dividend record date, both with respect to the number of shares under
    the option and with respect to the number of dividend equivalent shares
    previously credited to the participant and not issued during the period
    prior to the dividend record date. Accelerated vesting is provided in the
    event a change in control occurs. No stock appreciation rights have been
    granted under the Company's current benefit plans.

(2) Based on a Binomial Option Pricing Model, which is a variation of the
    Black-Scholes Option Pricing Model. For the stock options granted on April
    14, 1997, with a 10-year option period, an exercise price of $34.61, and
    with additional dividend equivalent shares granted for the first four years
    of the option, the Binomial Value adjusted for forfeiture risk is $8.96 per
    share. The following assumptions were used in the model: Stock Price:
    $34.61; Exercise Price: $34.61; Term: 10 years; Volatility: 0.098; Interest
    Rate: 7.05%; and Dividend Yield: 6.81%. The following were

                                       50
<PAGE>
 
    the valuation results: Binomial Option Value: $2.92; Dividend Credit Value:
    $6.04; and Total Value $8.96.

AGGREGATED OPTION EXERCISES AND FISCAL YEAR-END OPTION VALUES
- -------------------------------------------------------------

The following table shows the stock options, including dividend equivalents,
exercised by the named executive officers in 1997. Also shown is the number of
unexercised options and the value of unexercised in the money options, including
dividend equivalents, at the end of 1997. Under the Stock Option and Incentive
Plan, dividend equivalents have been granted to all named executive officers as
part of the 1997 stock option grant, to Mr. May as part of the 1996 stock option
grant, to Mr. Oyer as part of the 1988 stock option grant and to Mr. Jezierny as
part of the stock option grant for the 1990 through 1996 grants.

Dividend equivalents permit a participant who exercises a stock option to obtain
at no additional cost, in addition to the option shares, the amount of dividends
declared on the number of shares of common stock with respect to which the
option is exercised during the period between the grant and the exercise of the
option. Dividend equivalents are computed, as of each dividend record date
throughout the four-year vesting period (vesting in equal installments), which
begins on the date of grant, both with respect to the number of shares
underlying the option and with respect to the number of dividend equivalent
shares previously credited to the executive officer and not issued during the
period prior to the dividend record date.

              AGGREGATED OPTION EXERCISES IN LAST FISCAL YEAR AND
                         FISCAL YEAR-END OPTION VALUES

<TABLE>
<CAPTION>
                                                                                                                   Value of
                                                                                         Number of              Unexercised In
                                                                                        Unexercised            the Money Options
                                                                                     Options (Including           (Including
                                                                                          Dividend                 Dividend
                                                                        Value         Equivalents) at           Equivalents)at
                          Shares        Dividend                     Realized On      Fiscal Year-End         Fiscal Year-End (1)
                         Acquired     Equivalents       Value          Dividend     --------------------     ---------------------
                       On Exercise    Acquired On    Realized On     Equivalents        Exercisable/             Exercisable/
                           (#)        Exercise (#)   Options ($)         ($)         Unexercisable (#)         Unexercisable ($)
- --------------------------------------------------------------------------------------------------------------------------------
<S>                    <C>            <C>            <C>            <C>              <C>                     <C>
T. Michael May......         --          --           $    --         $     --         9,379 / 24,767        $ 57,137 / 208,901
Paul A. Oyer........        700         205             2,909            7,591         9,181 /  4,657          70,321 /  37,280
Thomas J. Jezierny..         --          --                --               --        20,469 /  8,461         274,776 /  87,150
Thomas L. Joaquin...         --          --                --               --         1,500 /  4,657          12,068 /  37,280
Edward Y. Hirata....         --          --                --               --         4,500 /  4,657          19,883 /  37,280
</TABLE>

(1) All options were in the money (where the option price is less than the
    closing price on December 31, 1997). Value based on closing price of $40.875
    per share on the New York Stock Exchange on December 31, 1997.

LONG-TERM INCENTIVE PLAN AWARDS TABLE
- -------------------------------------

A Long-Term Incentive Plan award made to Mr. May in 1997 was the only such award
made to the named executive officers in the HECO Summary Compensation Table.
Additional information required under this item is incorporated by reference to
page 16 of HEI's Definitive Proxy Statement, prepared for the Annual Meeting of
Stockholders to be held on April 28, 1998.

PENSION PLAN
- ------------

The Retirement Plan for Employees of Hawaiian Electric Industries, Inc. and
Participating Subsidiaries (the Retirement Plan) provides a monthly retirement
pension for life. Additional information required under this item is
incorporated by reference to "Pension Plans" on pages 17 and 18 of HEI's
Definitive Proxy Statement, prepared for the Annual Meeting of Stockholders to
be held on April 28, 1998. As of December 31, 1997, the named executive officers
in the HECO Summary Compensation Table had the following number of years of
credited service under the Retirement Plan: Mr. May, 5 years; Mr. Oyer, 31
years: Mr. Jezierny, 27 years; Mr. Joaquin, 24 years; and Mr. Hirata, 11 years.

                                       51
<PAGE>
 
CHANGE-IN-CONTROL AGREEMENTS
- ----------------------------

Mr. May is the only named executive officer in the HECO Summary Compensation
Table with whom HEI has a currently applicable Change-in-Control Agreement.
Additional information required under this item is incorporated by reference to
"Change-in-Control Agreements" on pages 18 and 19 of HEI's Definitive Proxy
Statement, prepared for the Annual Meeting of Stockholders to be held on April
28, 1998.

EXECUTIVE MANAGEMENT COMPENSATION
- ---------------------------------

Decisions on executive compensation for the named HECO executive officers are
made by the HEI Compensation Committee which is composed of six independent
nonemployee directors. All decisions by the Committee concerning HECO officers
are reviewed and approved by the full HEI Board of Directors as well as the HECO
Board of Directors.

HECO BOARD OF DIRECTORS
- -----------------------

Committees of the HECO Board
- ----------------------------

During 1997, the Board of Directors of HECO had only one standing committee, the
Audit Committee, which was comprised of three nonemployee directors: Edwin L.
Carter, Chairman, Diane J. Plotts and Paul C. Yuen. The Audit Committee holds
such meetings as it deems advisable to review the financial operations of HECO.
In 1997, the Audit Committee held five meetings to review with management, the
internal auditor and HECO's independent auditors the activities of the internal
auditor, the results of the annual audit by the independent auditors and the
financial statements which are included in HECO's 1997 Annual Report to
Stockholder.

Remuneration of HECO Directors and attendance at meetings
- ---------------------------------------------------------

In 1997, Paul C. Yuen and Anne M. Takabuki were the only nonemployee directors
of HECO who were not also directors of HEI. They were each paid a retainer of
$20,000, 60% of which was distributed in the common stock of HEI pursuant to the
HEI Nonemployee Director Stock Plan and 40% of which was distributed in cash.
The number of shares of stock distributed was based on a share price of
$33.3125, which is equal to the average high and low sales prices of HEI common
stock on April 25, 1997, with a cash payment made in lieu of any fractional
share. The nonemployee directors of HECO who were also nonemployee directors of
HEI did not receive a separate retainer from HECO. In addition, a fee of $700
was paid in cash to each nonemployee director (including nonemployee directors
of HECO who are also nonemployee directors of HEI) for each Board and Committee
meeting attended by the director. The Chairman of the HECO Audit Committee was
paid an additional $100 for each Committee meeting attended. Employee members of
the Board of Directors are not compensated for attendance at any meeting of the
Board or Committees of the Board.

In 1997, there were five regular bi-monthly meetings, two joint meetings and one
special meeting of the HECO Board of Directors. All incumbent directors attended
at least 75% of the combined total number of meetings of the Board and
Committees on which they served.

At the meeting of the HEI Board of Directors on December 17, 1996, the HEI Board
voted to terminate the Nonemployee Director Retirement Plan referenced on page 9
of HEI's Definitive Proxy Statement, prepared for the Annual Meeting of
Stockholders to be held on April 28, 1998, and pay the present value of the
accrued retirement benefits to directors age 55 and under or with 5 years of
service or less (Dr. Yuen) as of April 22, 1997, on the basis of 60% HEI Common
Stock and 40% cash. A discount rate of 6.5% was used in the calculation of the
present value and it was assumed that the current nonemployee director's accrued
benefits would commence at the mandatory retirement age of 72. The total present
value of Dr. Yuen's accrued benefits was $33,415, of which the cash portion was
paid on January 30, 1997, and the stock portion was invested in Dr. Yuen's HEI
Dividend Reinvestment and Stock Purchase Plan account on February 28, 1997.

                                       52
<PAGE>
 
ITEM 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

HEI:

The information required under this item is incorporated by reference to pages
11 and 12 of HEI's Definitive Proxy Statement, prepared for the Annual Meeting
of Stockholders to be held on April 28, 1998.

HECO:

HEI owns all of the common stock of HECO, which is HECO's only class of voting
securities. HECO has also issued and has outstanding various series of preferred
stock, the holders of which, upon certain defaults in dividend payments, have
the right to elect a majority of the directors of HECO.

The following table shows the shares of HEI common stock beneficially owned by
each HECO director (other than those who are also directors of HEI), named HECO
executive officers as listed in the Summary Compensation Table on pages 42 and
43 and by HECO directors and officers as a group, as of February 18, 1998, based
on information furnished by the respective individuals.

<TABLE>
<CAPTION>
                                                              Amount of Common Stock and Nature of
Name of Individual or Group                                           Beneficial Ownership
- ----------------------------------------------------------------------------------------------------
                                                                                             Total
                                                                                          ----------
<S>                                                                 <C>       <C>          <C>
Directors
- ---------
Paul A. Oyer*                                                         1,203   (a)
                                                                      9,051   (d)             10,254
                                                        -------------------
 
Anne M. Takabuki                                                        419   (a)                419
                                                        -------------------
 
Paul C. Yuen                                                          1,012   (a)
                                                                      1,069   (b)              2,081
                                                        -------------------
 
Other named executive officers
- ------------------------------
Thomas J. Jezierny                                                    3,473   (a)
                                                                     24,109   (d)             27,582
                                                        -------------------
 
 
Thomas L. Joaquin                                                     3,460   (a)
                                                                         26   (b)
                                                                         23   (c)
                                                                      3,051   (d)              6,560
                                                        -------------------
 
Edward Y. Hirata                                                      5,118   (a)
                                                                      6,051   (d)             11,169
                                                        -------------------
 
All directors and executive officers                                 40,471   (a)
as a group (18 persons)                                              13,548   (b)
                                                                        517   (c)
                                                                    196,524   (d)            251,060**
                                                        -------------------
</TABLE>

*    Also a named executive officer listed in the Summary Compensation Table on
     pages 49 and 43.
**   HECO directors Carter, Clarke, Henderson, May and Plotts, who also serve on
     the HEI Board of Directors, are not shown separately, but are included in
     the total amount. The information required as to these directors is
     incorporated by reference to page 11 of HEI's Definitive Proxy Statement,
     prepared for the Annual Meeting of Stockholders to be held on April 28,
     1998. Messrs. Clarke and May are also named executive officers listed in
     the Summary Compensation Table incorporated by reference to pages 13 and 14
     of the above-referenced Definitive Proxy

                                       53
<PAGE>
 
     Statement of HEI. The number of shares of common stock beneficially owned
     by any HECO director or by all HECO directors and officers as a group does
     not exceed 1% of the outstanding common stock of HEI.

(a)  Sole voting and investment power.
(b)  Shared voting and investment power (shares registered in name of respective
     individual and spouse).
(c)  Shares owned by spouse, children or other relatives sharing the home of the
     director or an officer in the group and in which personal interest of the
     director or officer is disclaimed.
(d)  Stock options, including accompanying dividend equivalents shares,
     exercisable within 60 days after February 18, 1998, under the 1987 Stock
     Option and Incentive Plan, as amended in 1992 and 1996.

ITEM 13.   CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

HEI:

The information required under this item is incorporated by reference to pages
24 to 25 of HEI's Definitive Proxy Statement, prepared for the Annual Meeting of
Stockholders to be held on April 28, 1998.

HECO:

The information required under this item is incorporated by reference to pages
24 to 25 of HEI's Definitive Proxy Statement, prepared for the Annual Meeting of
Stockholders to be held on April 28, 1998.

                                    PART IV
                                    -------

ITEM 14.  EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K

(a)(1)  FINANCIAL STATEMENTS

The following financial statements contained in HEI's 1997 Annual Report to
Stockholders and HECO's 1997 Annual Report to Stockholder, portions of which are
filed by HEI as Exhibit 13 and, portions of which are filed by HECO as Exhibit
13, respectively, are incorporated by reference in Part II, Item 8, of this Form
10-K:

<TABLE>
<CAPTION>
                                                                               1997 Annual Report to
                                                                              Stockholder(s) (Page/s)
                                                                        ---------------------------------
                                                                               HEI               HECO
   ------------------------------------------------------------------------------------------------------
 
      <S>                                                                          <C>                <C>
      Independent Auditors' Report......................................            40                 34
      Consolidated Statements of Income, Years ended December 31, 1997,
        1996 and 1995...................................................            41                 12
      Consolidated Statements of Retained Earnings, Years ended
        December 31, 1997, 1996 and 1995................................            41                 12
      Consolidated Balance Sheets, December 31, 1997 and 1996...........            42                 13
      Consolidated Statements of Capitalization,
        December 31, 1997 and 1996......................................            na              14-15
      Consolidated Statements of Cash Flows, Years ended December 31,
        1997, 1996 and 1995.............................................            43                 16
      Notes to Consolidated Financial Statements........................     26, 44-65              17-33
</TABLE>

                                       54
<PAGE>
 
(A)(2) FINANCIAL STATEMENT SCHEDULES

The following financial statement schedules for HEI and HECO are included in
this Report on the pages indicated below:

<TABLE>
<CAPTION>
                                                                                  Page/s in Form 10-K
                                                                          ---------------------------------
                                                                                 HEI               HECO
   --------------------------------------------------------------------------------------------------------
 
      <S>              <C>                                                   <C>                <C>
      Independent Auditors' Report                                                    56                 57
      Schedule II      Condensed Financial Information of Registrant,
                       Hawaiian Electric Industries, Inc. (Parent
                       Company) as of December 31, 1997 and 1996 and
                       Years ended December 31, 1997, 1996 and 1995.......         58-60                 na
      Schedule V       Valuation and Qualifying Accounts, Years ended
                       December 31, 1997, 1996 and 1995...................            61                 61
 
</TABLE>

Certain Schedules, other than those listed, are omitted because they are not
required, or are not applicable, or the required information is shown in the
consolidated financial statements or notes included in HEI's 1997 Annual Report
to Stockholders and HECO's 1997 Annual Report to Stockholder, which financial
statements are incorporated herein by reference.

(A)(3)  EXHIBITS

Exhibits for HEI and HECO and their subsidiaries are listed in the "Index to
Exhibits" found on pages 62 through 70 of this Form 10-K. The exhibits listed
for HEI and HECO are listed in the index under the headings "HEI" and "HECO,"
respectively, except that the exhibits listed under "HECO" are also considered
exhibits for HEI.

(B)  REPORTS ON FORM 8-K

HEI AND HECO:

During the fourth quarter of 1997, HEI and HECO filed a Form 8-K, dated October
16, 1997, under Item 5, which included HEI's October 16, 1997 news release
reporting third quarter 1997 earnings. During the fourth quarter of 1997, HEI
filed a Form 8-K, dated December 6, 1997, under Items 2 and 7, which included
the purchase and assumption agreement with BoA.

On January 30, 1998, HEI filed a Form 8-K/A, dated December 6, 1997, under Item
7, which included financial statements and pro forma financial information
relating to ASB's acquisition of most of the Hawaii operations of BoA. On March
2, 1998, HEI and HECO filed a Form 8-K, dated February 27, 1998, under Item 7,
which included portions of HEI's 1997 Annual Report to Stockholders and HECO's
1997 Annual Report to Stockholder. On March 11, 1998, HEI and HECO filed a Form
8-K, dated March 2, 1998, under Item 5, which updated the following: "PUC show
cause order for HECO," "HELCO power situation," "Property damage reserve" and
"Competition."

                                       55
<PAGE>
 
[KPMG Peat Marwick letterhead]



                          Independent Auditors' Report
                          ----------------------------
                                        



The Board of Directors
  and Stockholders
Hawaiian Electric Industries, Inc.:

Under date of January 19, 1998, we reported on the consolidated balance sheets
of Hawaiian Electric Industries, Inc. and subsidiaries as of December 31, 1997
and 1996, and the related consolidated statements of income, retained earnings
and cash flows for each of the years in the three-year period ended December 31,
1997, as contained in the 1997 annual report to stockholders. These consolidated
financial statements and our report thereon are incorporated by reference in the
annual report on Form 10-K for the year 1997. In connection with our audits of
the aforementioned consolidated financial statements, we also audited the
related financial statement schedules as listed in the accompanying index. These
financial statement schedules are the responsibility of the Company's
management. Our responsibility is to express an opinion on these financial
statement schedules based on our audits.

In our opinion, such financial statement schedules, when considered in relation
to the basic consolidated financial statements taken as a whole, present fairly,
in all material respects, the information set forth therein.



/s/ KPMG Peat Marwick LLP

Honolulu, Hawaii
January 19, 1998

                                       56
<PAGE>
 
[KPMG Peat Marwick letterhead]



                          Independent Auditors' Report
                          ----------------------------
                                        



The Board of Directors
  and Stockholder
Hawaiian Electric Company, Inc.:

Under date of January 19, 1998, we reported on the consolidated balance sheets
and consolidated statements of capitalization of Hawaiian Electric Company, Inc.
(a wholly owned subsidiary of Hawaiian Electric Industries, Inc.) and
subsidiaries as of December 31, 1997 and 1996, and the related consolidated
statements of income, retained earnings and cash flows for each of the years in
the three-year period ended December 31, 1997, as contained in the 1997 annual
report to stockholder. These consolidated financial statements and our report
thereon are incorporated by reference in the annual report on Form 10-K for the
year 1997. In connection with our audits of the aforementioned consolidated
financial statements, we also audited the related financial statement schedule
as listed in the accompanying index. The financial statement schedule is the
responsibility of the Company's management. Our responsibility is to express an
opinion on the financial statement schedule based on our audits.

In our opinion, such financial statement schedule, when considered in relation
to the basic consolidated financial statements taken as a whole, presents
fairly, in all material respects, the information set forth therein.



/s/ KPMG Peat Marwick LLP

Honolulu, Hawaii
January 19, 1998

                                       57
<PAGE>
 
                       Hawaiian Electric Industries, Inc.
          SCHEDULE II -- CONDENSED FINANCIAL INFORMATION OF REGISTRANT
              HAWAIIAN ELECTRIC INDUSTRIES, INC. (PARENT COMPANY)
                            CONDENSED BALANCE SHEETS
                                        
<TABLE>
<CAPTION>
                                                                                 December 31,
                                                                    -----------------------------------
(in thousands)                                                              1997              1996
- -------------------------------------------------------------------------------------------------------
<S>                                                                        <C>              <C>
ASSETS
Cash and equivalents................................................        $      416       $    1,161
Advances to and notes receivable from subsidiaries..................            25,459           40,455
Accounts receivable.................................................             1,315            2,135
Other investments...................................................               810              810
Property, plant and equipment, net..................................             3,288            3,177
Other assets........................................................             4,182            2,933
Investment in wholly owned subsidiaries, at equity..................         1,245,415        1,021,115
                                                                    -----------------------------------
                                                                            $1,280,885       $1,071,786
                                                                    ===================================
 
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable....................................................        $    3,555       $    7,231
Notes payable to subsidiaries.......................................             3,181               --
Commercial paper....................................................           189,482           87,600
Long-term debt......................................................           160,000          191,500
Loan from HEI Preferred Funding, LP (8.36% due in 2017).............           103,000               --
Deferred income taxes...............................................             1,374            3,055
Unamortized tax credits.............................................               117               30
Other...............................................................             5,495            9,518
                                                                    -----------------------------------
                                                                               466,204          298,934
                                                                    -----------------------------------
Stockholders' equity
Common stock........................................................           654,819          622,945
Retained earnings...................................................           159,862          149,907
                                                                    -----------------------------------
                                                                               814,681          772,852
                                                                    -----------------------------------
                                                                            $1,280,885       $1,071,786
                                                                    ===================================
 
Note to Balance Sheets
- ----------------------
Long-term debt consisted of the following:
Promissory notes, 6.3% - 7.1%, due in various years through 2012....        $   96,000       $  127,000
Promissory notes, 8.2% - 8.7%, due in various years through 2011....            29,000           29,500
Promissory note, variable rate (6.325% at December 31, 1997) due
 1999...............................................................            35,000           35,000
                                                                    -----------------------------------
                                                                            $  160,000       $  191,500
                                                                    ===================================
</TABLE>

As of December 31, 1997, HEI guaranteed its subsidiary and affiliate
nonintercompany debt of $7 million.

The aggregate payments of principal required on long-term debt and a loan from
HEI Preferred Funding, LP subsequent to December 31, 1997 are $1 million in
1998, $41 million in 1999, $11 million in 2000, $23 million in 2001 and $5
million in 2002.

                                       58
<PAGE>
 
                       Hawaiian Electric Industries, Inc.
    SCHEDULE II -- CONDENSED FINANCIAL INFORMATION OF REGISTRANT (CONTINUED)
              HAWAIIAN ELECTRIC INDUSTRIES, INC. (PARENT COMPANY)
                         CONDENSED STATEMENTS OF INCOME


<TABLE>
<CAPTION>
                                                                   Years ended December 31,
                                                    ----------------------------------------------------
(in thousands)                                              1997              1996             1995
- --------------------------------------------------------------------------------------------------------
<S>                                                    <C>               <C>              <C>
REVENUES............................................          $  2,468          $ 2,731          $ 2,923
 
Equity in income of subsidiaries....................            99,093           93,488           89,198
                                                    ----------------------------------------------------
                                                               101,561           96,219           92,121
                                                    ----------------------------------------------------
 
EXPENSES:
 
Operating, administrative and general...............             7,661            8,639            7,543
 
Depreciation and amortization of property,
   plant and equipment..............................               864              651              491
 
Taxes, other than income taxes......................               300              325              282
                                                    ----------------------------------------------------
                                                                 8,825            9,615            8,316
                                                    ----------------------------------------------------
                                                                92,736           86,604           83,805
 
Interest expense....................................            22,822           18,103           17,922
                                                    ----------------------------------------------------
 
 
INCOME BEFORE INCOME TAX BENEFIT....................            69,914           68,501           65,883
 
Income tax benefit..................................            16,528           10,157           11,610
                                                    ----------------------------------------------------
NET INCOME..........................................          $ 86,442          $78,658          $77,493
                                                    ====================================================
</TABLE>

                                       59
<PAGE>
 
                       Hawaiian Electric Industries, Inc.
    SCHEDULE II -- CONDENSED FINANCIAL INFORMATION OF REGISTRANT (CONTINUED)
              HAWAIIAN ELECTRIC INDUSTRIES, INC. (PARENT COMPANY)
                       CONDENSED STATEMENTS OF CASH FLOWS

<TABLE>
<CAPTION>
                                                                                 Years ended December 31,
                                                                    -----------------------------------------------
(in thousands)                                                             1997            1996            1995
- ------------------------------------------------------------------------------------------------------------------- 
<S>                                                                       <C>             <C>             <C>
CASH FLOWS FROM OPERATING ACTIVITIES
Net income..........................................................      $  86,442        $ 78,658        $ 77,493
Adjustments to reconcile net income to net cash provided by
 operating activities
  Equity in income of subsidiaries..................................        (99,093)        (93,488)        (89,198)
  Dividends/distributions received from subsidiaries................         72,762          67,972          51,435
  Depreciation and amortization of property, plant and equipment....            864             651             491
  Other amortization................................................            183             288             239
  Deferred income taxes and tax credits, net........................         (3,433)             (9)         (1,236)
  Changes in assets and liabilities
     Decrease in accounts receivable................................            820             269             161
     Increase (decrease) in accounts payable........................         (3,676)             79          (2,094)
     Changes in other assets and liabilities........................         (3,615)            711           1,880
                                                                    -----------------------------------------------
NET CASH PROVIDED BY OPERATING ACTIVITIES...........................         51,254          55,131          39,171
                                                                    -----------------------------------------------
 
CASH FLOWS FROM INVESTING ACTIVITIES
Net decrease (increase) in advances to and notes receivable from
 subsidiaries.......................................................         14,996             121         (12,880)
Capital expenditures................................................           (975)         (1,401)           (488)
Additional investments in subsidiaries..............................       (203,703)        (28,100)        (39,610)
                                                                    -----------------------------------------------
NET CASH USED IN INVESTING ACTIVITIES...............................       (189,682)        (29,380)        (52,978)
                                                                    -----------------------------------------------
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase (decrease) in notes payable to subsidiaries with
 original maturities of three months or less........................          3,181              --          (2,293)
Net increase in commercial paper....................................        101,882          42,207          32,643
Proceeds from issuance of long-term debt............................         19,000          10,000          30,000
Repayment of long-term debt.........................................        (50,500)        (42,000)        (16,000)
Loan from HEI Preferred Funding, LP.................................        103,000              --              --
Net proceeds from issuance of common stock..........................         22,919          19,818          19,322
Common stock dividends..............................................        (61,799)        (55,288)        (49,415)
                                                                    -----------------------------------------------
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES.................        137,683         (25,263)         14,257
                                                                    -----------------------------------------------
 
Net increase (decrease) in cash and equivalents.....................           (745)            488             450
Cash and equivalents, beginning of year.............................          1,161             673             223
                                                                    -----------------------------------------------
CASH AND EQUIVALENTS, END OF YEAR...................................      $     416        $  1,161        $    673
                                                                    ===============================================
</TABLE>

Supplemental disclosures of noncash activities:
  In 1997, 1996 and 1995, $1.0 million, $1.1 million and $1.3 million,
respectively, of HEI advances to HEIDI were converted to equity in a noncash
transaction.
  Common stock dividends reinvested by stockholders in HEI common stock in
noncash transactions amounted to $15 million in 1997, $18 million in 1996 and
$20 million in 1995.

                                       60
<PAGE>
 
                       Hawaiian Electric Industries, Inc.
                      and Hawaiian Electric Company, Inc.
               SCHEDULE V  --  VALUATION AND QUALIFYING ACCOUNTS
                  Years ended December 31, 1997, 1996 and 1995

<TABLE>
<CAPTION>
- ---------------------------------------------------------------------------------------------------------------------------------
              Col. A                        Col. B                      Col. C                       Col. D             Col. E
- ---------------------------------------------------------------------------------------------------------------------------------
 
(in thousands)                                                     Additions
                                                        --------------------------------
                                            Balance
                                              at           
                                           beginning       Charged to                                                Balance at
                                              of            costs and        Charged to                                end of
Description                                 period          expenses       other accounts         Deductions           period
- ---------------------------------------------------------------------------------------------------------------------------------
<S>                                   <C>               <C>               <C>                   <C>                 <C> 
              1997
              ----
Allowance for uncollectible
 accounts
 Hawaiian Electric Company, Inc.
  and subsidiaries.................   $        1,167    $        2,850    $        1,256       $       3,988       $        1,285
 Other companies...................            1,433               653                --                  83                2,003
                                       -------------    --------------    --------------       -------------       --------------
                                      $        2,600    $        3,503    $        1,256(a)    $       4,071(b)    $        3,288
                                       =============    ==============    ==============       =============       ==============
Allowance for uncollectible
 interest (ASB)....................   $        2,272    $        2,166    $           --       $          --       $        4,438
                                       =============    ==============    ==============       =============       ==============
Allowance for losses for loans
 receivable (ASB)..................   $       19,205    $        6,934    $  6,656(c)          $  2,845(b)         $       29,950
                                       =============    ==============    ==============       =============       ==============

              1996
              ----
Allowance for uncollectible
 accounts
 Hawaiian Electric Company, Inc.
  and subsidiaries.................   $        1,101    $        2,591    $        1,310       $       3,835       $        1,167
 Other companies...................              642               846                 7                  62                1,433
                                       -------------    --------------    --------------       -------------       --------------
                                      $        1,743    $        3,437    $        1,317(a)    $       3,897(b)    $        2,600
                                       =============    ==============    ==============       =============       ==============
Allowance for uncollectible
 interest (ASB)....................   $        1,273    $          999    $           --       $          --       $        2,272
                                       =============    ==============    ==============       =============       ==============
Allowance for losses for loans
 receivable (ASB)..................   $       12,916    $        7,631    $          106(a)    $       1,448(b)    $       19,205
                                       =============    ==============    ==============       =============       ==============
 
              1995
              ----
Allowance for uncollectible
 accounts
 Hawaiian Electric Company, Inc.
  and subsidiaries.................   $        1,136    $        2,492    $        1,266       $       3,793       $        1,101
 Other companies...................              280               400                --                  38                  642
                                       -------------    --------------    --------------       -------------       --------------
                                      $        1,416    $        2,892    $        1,266(a)    $       3,831(b)    $        1,743
                                       =============    ==============    ==============       =============       ==============
Allowance for uncollectible
 interest (ASB)....................   $        1,101    $          172    $           --       $          --       $        1,273
                                       =============    ==============    ==============       =============       ==============
Allowance for losses for loans
 receivable (ASB)..................   $        8,793    $        4,887    $          392(a)    $       1,156(b)    $       12,916
                                       =============    ==============    ==============       =============       ==============
</TABLE>

(a)  Primarily bad debts recovered.
(b)  Bad debts charged off.
(c)  Primarily related to loans receivable acquired from BoA.

                                       61
<PAGE>
 
                               INDEX TO EXHIBITS
                                        
The exhibits designated by an asterisk (*) are filed herein. The exhibits not so
designated are incorporated by reference to the indicated filing. A copy of any
exhibit may be obtained upon written request for a $0.20 per page charge from
the HEI Shareholder Services Division, P.O. Box 730, Honolulu, Hawaii 96808-
0730.

<TABLE>
<CAPTION>
EXHIBIT NO.                                      DESCRIPTION
- -----------                                      -----------
 
HEI:
- ----------------
  <S>              <C>
  3(i).1           HEI's Restated Articles of Incorporation (Exhibit 4(b) to Registration No. 33-7895).
 
  3(i).2           Articles of Amendment of HEI filed June 30, 1990 (Exhibit 4(b) to Registration
                   No. 33-40813).
 
 *3(i).3           Statement of Issuance of Shares of Preferred or Special Classes in Series for HEI
                   Series A Junior Participating Preferred Stock filed October 28, 1997.
 
  3(ii)            HEI's Restated By-Laws (Exhibit 3(ii) to Form 10-Q for the quarter ended September
                   30, 1997).
 
  4.1              Agreement to provide the SEC with instruments which define the rights of holders of
                   certain long-term debt of HEI and its subsidiaries (Exhibit 4.1 to HEI's Annual
                   Report on Form 10-K for the fiscal year ended December 31, 1992, File No. 1-8503).
 
  4.2              Rights Agreement, dated as of October 28, 1997, between HEI and Continental Stock
                   Transfer & Trust Company, as Rights Agent, which includes as Exhibit B thereto the
                   Form of Rights Certificates (Exhibit 1 to HEI's Form 8-A, dated October 28, 1997,
                   File No. 1-8503).
 
  4.3              Indenture, dated as of October 15, 1988, between HEI and Citibank, N.A., as Trustee
                   (Exhibit 4 to Registration No. 33-25216).
 
  4.4              First Supplemental Indenture dated as of June 1, 1993 between HEI and Citibank, N.A.,
                   as Trustee, to Indenture dated as of October 15, 1988 between HEI and Citibank, N.A.,
                   as Trustee (Exhibit 4(a) to HEI's Quarterly Report on Form 10-Q for the quarter ended
                   September 30, 1993, File No. 1-8503).
 
  4.5              Pricing Supplements Nos. 1 through 9 to the Registration Statement on Form S-3 of HEI
                   (Registration No. 33-58820) filed in connection with the sale of Medium-Term Notes,
                   Series B (Exhibit 4(b) to HEI's Quarterly Report on Form 10-Q for the quarter ended
                   September 30, 1993, File No. 1-8503).
 
  4.5(a)           Pricing Supplement No. 10 to Registration Statement on Form S-3 of HEI (Registration
                   No. 33-58820) filed in connection with the sale of Medium-Term Notes, Series B
                   (Exhibit 4.7 to HEI's Annual Report on Form 10-K for the fiscal year ended December
                   31, 1994, File No. 1-8503).
 
  4.5(b)           Pricing Supplement No. 11 to Registration Statement on Form S-3 of HEI (Registration
                   No. 33-58820) filed on December 1, 1995 in connection with the sale of Medium-Term
                   Notes, Series B (Exhibit 4.8 to HEI's Annual Report on Form 10-K for the fiscal year
                   ended December 31, 1995, File No. 1-8503).
 
  4.5(c)           Pricing Supplement No. 12 to Registration Statement on Form S-3 of HEI (Registration
                   No. 33-58820) filed on February 12, 1996 in connection with the sale of Medium-Term
                   Notes, Series B (Exhibit 4.9 to HEI's Annual Report on Form 10-K for the fiscal year
                   ended December 31, 1995, File No. 1-8503).
</TABLE> 

                                       62
<PAGE>
 
<TABLE>
<CAPTION>
EXHIBIT NO.                                 DESCRIPTION
- -----------                                 -----------
<S>                <C> 
  4.5(d)           Pricing Supplements Nos. 13 through 14 to Registration Statement on Form S-3 of HEI
                   (Registration No. 33-58820) filed on September 26, 1997 in connection with the sale
                   of Medium-Term Notes, Series B.
 
  4.5(e)           Pricing Supplement No. 15 to Registration Statement on Form S-3 of HEI (Registration
                   No. 33-58820) filed on September 29, 1997 in connection with the sale of Medium-Term
                   Notes, Series B.
 
  4.5(f)           Pricing Supplement No. 16 to Registration Statement on Form S-3 of HEI (Registration
                   No. 33-58820) filed on September 30, 1997 in connection with the sale of Medium-Term
                   Notes, Series B.
 
  4.5(g)           Pricing Supplement No. 17 to Registration Statement on Form S-3 of HEI (Registration
                   No. 33-58820) filed on October 2, 1997 in connection with the sale of Medium-Term
                   Notes, Series B.
 
  4.5(h)           Pricing Supplement No. 18 to Registration Statement on Form S-3 of HEI (Registration
                   No. 33-58820) filed on February 5, 1998 in connection with the sale of Medium-Term
                   Notes, Series B.
 
  4.5(i)           Pricing Supplement No. 19 to Registration Statement on Form S-3 of HEI (Registration
                   No. 33-58820) filed on February 6, 1998 in connection with the sale of Medium-Term
                   Notes, Series B.
 
  4.5(j)           Pricing Supplement No. 20 to Registration Statement on Form S-3 of HEI (Registration
                   No. 33-58820) filed on February 6, 1998 in connection with the sale of Medium-Term
                   Notes, Series B.
 
  4.5(k)           Pricing Supplement No. 21 to Registration Statement on Form S-3 of HEI (Registration
                   No. 33-58820) filed on February 12, 1998 in connection with the sale of Medium-Term
                   Notes, Series B.
 
  4.6              Purchase Agreement dated March 7, 1991 among HEI and the Purchasers named therein,
                   together with the Notes issued to such Purchasers, each dated March 7, 1991, pursuant
                   to the Purchase Agreement (Exhibit 4.5 to HEI's Annual Report on
                   Form 10-K for the fiscal year ended December 31, 1990, File No. 1-8503).
 
  4.7              Composite conformed copy of the Note Purchase Agreement dated as of December 16, 1991
                   among HEI and the Purchasers named therein (Exhibit 4.6 to HEI's Annual Report on
                   Form 10-K for the fiscal year ended December 31, 1991, File No. 1-8503).
 
  4.8              Amended and Restated Agreement of Limited Partnership of the Partnership dated as of
                   February 1, 1997 (Exhibit 4(e) to HEI's Current Report on Form 8-K dated February 4,
                   1997, File No. 1-8503).
 
  4.9              Amended and Restated Trust Agreement of Hawaiian Electric Industries Capital Trust I
                   (HEI Trust I) dated as of February 1, 1997 (Exhibit 4(f) to HEI's Current Report on
                   Form 8-K dated February 4, 1997, File No. 1-8503).
 
  4.10             Junior Indenture between HEI and The Bank of New York, as Trustee, dated as of
                   February 1, 1997 (Exhibit 4(i) to HEI's Current Report on Form 8-K dated February 4,
                   1997, File No. 1-8503).
</TABLE> 

                                       63
<PAGE>
 
<TABLE>
<CAPTION>
EXHIBIT NO.                                     DESCRIPTION
- -----------                                     -----------
<S>                <C> 
  4.11             Officers' Certificate in connection with issuance of 8.36% Junior Subordinated
                   Debenture, Series A, Due 2017 under Junior Indenture of HEI (Exhibit 4(l) to HEI's
                   Current Report on Form 8-K dated February 4, 1997, File No. 1-8503).
 
  4.12             8.36% Trust Originated Preferred Security (Liquidation Amount $25 Per Trust Preferred
                   Security) of HEI Trust I (Exhibit 4(m) to HEI's Current Report on Form 8-K dated
                   February 4, 1997, File No. 1-8503).
 
  4.13             8.36% Junior Subordinated Debenture Series A, Due 2017, of HEI (Exhibit 4(n) to HEI's
                   Current Report on Form 8-K dated February 4, 1997, File No. 1-8503).
 
  4.14             Trust Preferred Securities Guarantee Agreement with respect to HEI Trust I dated as
                   of February 1, 1997 (Exhibit 4(o) to HEI's Current Report on Form 8-K dated February
                   4, 1997, File No. 1-8503).
 
  4.15             Partnership Guarantee Agreement with respect to the Partnership dated as of February
                   1, 1997 (Exhibit 4(p) to HEI's Current Report on Form 8-K dated February 4, 1997,
                   File No. 1-8503).
 
  4.16             Affiliate Investment Instruments Guarantee Agreement with respect to 8.36% Junior
                   Subordinated Debenture of HEIDI dated as of February 1, 1997 (Exhibit 4(q) to HEI's
                   Current Report on Form 8-K dated February 4, 1997, File No. 1-8503).
 
  4.17             Certificate Evidencing Trust Common Securities of HEI Trust I dated February 4, 1997
                   (Exhibit 4.12 to the Quarterly Report on Form 10-Q of HEI Trust I and the
                   Partnership, File No. 1-8503-02, for the quarter ended March 31, 1997).
 
  4.18             Certificate Evidencing Partnership Preferred Securities of the Partnership dated
                   February 4, 1997 (Exhibit 4.13 to the Quarterly Report on Form 10-Q of HEI Trust I
                   and the Partnership, File No. 1-8503-02, for the quarter ended March 31, 1997).
 
  10.1             PUC Order Nos. 7070, 7153, 7203 and 7256 in Docket No. 4337, including copy of
                   "Conditions for the Merger and Corporate Restructuring of Hawaiian Electric Company,
                   Inc." dated September 23, 1982 (Exhibit 10 to Amendment No. 1 to
                   Form U-1).
 
  10.2             Regulatory Capital Maintenance/Dividend Agreement dated May 26, 1988, between HEI,
                   HEIDI and the Federal Savings and Loan Insurance Corporation (by the Federal Home
                   Loan Bank of Seattle) (Exhibit (28)-2 to HEI's Current Report on Form 8-K dated May
                   26, 1988, File No. 1-8503).
 
  10.2(a)          OTS letter regarding release from Part II.B. of the Regulatory Capital
                   Maintenance/Dividend Agreement dated May 26, 1988 (Exhibit 10.3(a) to HEI's Annual
                   Report on Form 10-K for the fiscal year ended December 31, 1992,
                   File No. 1-8503).
 
  10.3             Executive Incentive Compensation Plan (Exhibit 10(a) to HEI's Annual Report on
                   Form 10-K for the fiscal year ended December 31, 1987, File No. 1-8503).
 
  10.4             HEI Executives' Deferred Compensation Plan (Exhibit 10.5 to HEI's Annual Report on
                   Form 10-K for the fiscal year ended December 31, 1990, File No. 1-8503).
 
  10.5             1987 Stock Option and Incentive Plan of HEI as amended and restated effective
                   February 20, 1996 (Exhibit A to Proxy Statement of HEI, dated March 8, 1996, for the
                   Annual Meeting of Stockholders, File No. 1-8503).
</TABLE> 

                                       64
<PAGE>
 
<TABLE>
<CAPTION>
EXHIBIT NO.                                   DESCRIPTION
- -----------                                   -----------
<S>                <C> 
  10.6             HEI Long-Term Incentive Plan (Exhibit 10.11 to HEI's Annual Report on Form 10-K
                   for the fiscal year ended December 31, 1988, File No. 1-8503).
 
  10.7             HEI Supplemental Executive Retirement Plan effective January 1, 1990 (Exhibit 10.9 to
                   HEI's Annual Report on Form 10-K for the fiscal year ended December 31, 1990, File
                   No. 1-8503).
 
  10.8             HEI Excess Benefit Plan (Exhibit 10.13 (Exhibit A) to HEI's Annual Report on
                   Form 10-K for the fiscal year ended December 31, 1989, File No. 1-8503).
 
  10.9             Change-in-Control Agreement (Exhibit 10.14 to HEI's Annual Report on Form 10-K
                   for the fiscal year ended December 31, 1989, File No. 1-8503).
 
  10.10            Nonemployee Director Retirement Plan, effective as of October 1, 1989 (Exhibit 10.15
                   to HEI's Annual Report on Form 10-K for the fiscal year ended December 31, 1989,
                   File No. 1-8503).
 
  10.11            HEI 1990 Nonemployee Director Stock Plan (Exhibit 10(a) to HEI's Quarterly Report on
                   Form 10-Q for the quarter ended September 30, 1990, File No. 1-8503).
 
  10.12            HEI Nonemployee Directors' Deferred Compensation Plan (Exhibit 10.14 to HEI's Annual
                   Report on Form 10-K for the fiscal year ended December 31, 1990,
                   File No. 1-8503).
 
  10.13            HEI and HECO Executives' Deferred Compensation Agreement. The agreement pertains to
                   and is substantially identical for all the HEI and HECO executive officers (Exhibit
                   10.15 to HEI's Annual Report on Form 10-K for the fiscal year ended December 31,
                   1991, File No. 1-8503).
 
  10.14            Settlement Agreement and General Release made and entered into on February 10, 1994,
                   by and between the Insurance Commissioner as Rehabilitator/Liquidator, HIG and its
                   subsidiaries, the Hawaii Insurance Guaranty Association, HEI, HEIDI and others.
                   (Exhibit 10.20 to HEI's Annual Report on Form 10-K for the fiscal year ended December
                   31, 1993, File No. 1-8503).
 
 *11               Computation of Earnings per Share of Common Stock. Filed herein as page 71.
 
 *12.1             Computation of Ratio of Earnings to Fixed Charges. Filed herein as pages 72 and 73.
 
  13               Pages 25 to 66 of HEI's 1997 Annual Report to Stockholders (with the exception of the
                   data incorporated by reference in Part I, Part II, Part III and Part IV, no other data
                   appearing in the 1997 Annual Report to Stockholders is to be deemed filed as part of
                   this Form 10-K Annual Report) (HEI Exhibit 13.1 to HEI's Current Report on Form 8-K
                   dated February 27, 1998, File No. 1-8503).

 *21.1             Subsidiaries of HEI. Filed herein as page 75.
 
 *23               Accountants' Consent. Filed herein as page 77.
 
 *27.1             HEI and subsidiaries financial data schedule, December 31, 1997 and year ended
                   December 31, 1997.
 
 *27.1(a)          HEI and subsidiaries restated financial data schedule, December 31, 1996 and year
                   ended December 31, 1996.
 
 *27.1(b)          HEI and subsidiaries restated financial data schedule, December 31, 1995 and year
                   ended December 31, 1995.
</TABLE> 

                                       65
<PAGE>
 
<TABLE>
<CAPTION>
EXHIBIT NO.                                      DESCRIPTION
- -----------                                      -----------
<S>                <C> 
  *99.1            HEI Dividend Reinvestment and Stock Purchase Plan (as amended through February 2,
                   1998).
 
  *99.2            Eighth Amendment to Trust Agreement, made and entered into on February 27, 1998,
                   Between Fidelity Management Trust Company and HEI for the Hawaiian Electric
                   Industries Retirement Savings Plan for incorporation by reference in the Registration
                   Statement on Form S-8 (Regis. No. 333-02103).

<CAPTION>
HECO:
- ----------------
  <S>              <C>
  3(i).1           HECO's Certificate of Amendment of Articles of Incorporation (filed June 30, 1987)
                   (Exhibit 3.1 to HECO's Annual Report on Form 10-K for the fiscal year ended December
                   31, 1988, File No. 1-4955).
 
  3(i).2           Statement of Issuance of Shares of Preferred or Special Classes in Series for HECO
                   Series R Preferred Stock filed December 15, 1989 (Exhibit 3.1(a) to HECO's Annual
                   Report on Form 10-K for the fiscal year ended December 31, 1989, File No. 1-4955).
 
  3(i).3           Articles of Amendment to HECO's Amended Articles of Incorporation filed December 21,
                   1989 (Exhibit 3.1(b) to HECO's Annual Report on Form 10-K for the fiscal year ended
                   December 31, 1989, File No 1-4955).
 
  3(ii)            HECO's By-Laws (Exhibit 3.2 to HECO's Annual Report on Form 10-K for the fiscal year
                   ended December 31, 1988, File No. 1-4955).
 
  4.1              Agreement to provide the SEC with instruments which define the rights of holders of
                   certain long-term debt of HECO, HELCO and MECO (Exhibit 4 to HECO's Annual Report on
                   Form 10-K for the fiscal year ended December 31, 1988, File No. 1-4955).
 
  4.2              Indenture dated as of December 1, 1993 between HECO and The Bank of New York, as
                   Trustee (Exhibit 4(a) to Registration No. 33-51025).
 
  4.3              Indenture dated as of December 1, 1993 among MECO, HECO, as guarantor, and
                   The Bank of New York, as Trustee (Exhibit 4(b) to Registration No. 33-51025).
 
  4.4              Indenture dated as of December 1, 1993 among HELCO, HECO, as guarantor, and
                   The Bank of New York, as Trustee (Exhibit 4(c) to Registration No. 33-51025).
 
  4.5              Officers' Certificate dated as of December 22, 1993, pursuant to Sections 102 and 301
                   of the Indenture dated as of December 1, 1993 between HECO and The Bank of New York,
                   as Trustee, establishing the $30,000,000 Notes, 5.83% Series Due 1998 (Exhibit 4.6 to
                   HECO's Annual Report on Form 10-K for the fiscal year ended December 31, 1993, File
                   No. 1-4955).
 
  4.6              Amended and Restated Trust Agreement of HECO Capital Trust I (HECO Trust I) dated as
                   of March 1, 1997 (Exhibit 4(c) to HECO's Current Report on Form 8-K dated March 27,
                   1997, File No. 1-4955).
 
  4.7              HECO Junior Indenture with The Bank of New York, as Trustee, dated as of March 1,
                   1997 (Exhibit 4(d) to HECO's Current Report on Form 8-K dated March 27, 1997, File
                   No. 1-4955).
 
  4.8              8.05% Cumulative Quarterly Income Preferred Security (liquidation preference $25 per
                   preferred security) of HECO Trust I (Exhibit 4(e) to HECO's Current Report on Form
                   8-K dated March 27, 1997, File No. 1-4955).
</TABLE> 

                                       66
<PAGE>
 
<TABLE> 
<CAPTION>
EXHIBIT NO.                                      DESCRIPTION
- -----------                                      -----------
<S>                <C>  
  4.9              8.05% Junior Subordinated Deferrable Interest Debenture, Series 1997 of HECO (Exhibit
                   4(f) to HECO's Current Report on Form 8-K dated March 27, 1997, File No. 1-4955).
 
  4.10             Trust Guarantee Agreement with respect to HECO Trust I dated as of March 1, 1997
                   (Exhibit 4(g) to HECO's Current Report on Form 8-K dated March 27, 1997, File No.
                   1-4955).
 
  4.11             MECO Junior Indenture with The Bank of New York, as Trustee, including HECO
                   Subsidiary Guarantee, dated as of March 1, 1997 (with the form of MECO's 8.05% Junior
                   Subordinated Deferrable Interest Debenture, Series 1997 included as Exhibit A)
                   (Exhibit 4(h)-1 to HECO's Current Report on Form 8-K dated March 27, 1997, File No.
                   1-4955).
 
  4.12             HELCO Junior Indenture with The Bank of New York, as Trustee, including HECO
                   Subsidiary Guarantee, dated as of March 1, 1997 (with the form of HELCO's 8.05%
                   Junior Subordinated Deferrable Interest Debenture, Series 1997 included as Exhibit A)
                   (Exhibit 4(h)-2 to HECO's Current Report on Form 8-K dated March 27, 1997, File No.
                   1-4955).
 
  4.13             Agreement as to Expenses and Liabilities among HECO Trust I, HECO, MECO and HELCO
                   (Exhibit 4(i) to HECO's Current Report on Form 8-K dated March 27, 1997, File No.
                   1-4955).
 
  10.1             Power Purchase Agreement between Kalaeloa Partners, L.P., and HECO dated October 14,
                   1988 (Exhibit 10(a) to HECO's Quarterly Report on Form 10-Q for the quarter ended
                   September 30, 1988, File No. 1-4955).
 
  10.1(a)          Amendment No. 1 to Power Purchase Agreement between HECO and Kalaeloa Partners, L.P.,
                   dated June 15, 1989 (Exhibit 10(c) to HECO's Quarterly Report on
                   Form 10-Q for the quarter ended June 30, 1989, File No. 1-4955).
 
  10.1(b)          Lease Agreement between Kalaeloa Partners, L.P., as Lessor, and HECO, as Lessee,
                   dated February 27, 1989 (Exhibit 10(d) to HECO's Quarterly Report on Form 10-Q for
                   the quarter ended June 30, 1989, File No. 1-4955).
 
  10.1(c)          Restated and Amended Amendment No. 2 to Power Purchase Agreement between HECO and
                   Kalaeloa Partners, L.P., dated February 9, 1990 (Exhibit 10.2(c) to HECO's Annual
                   Report on Form 10-K for the fiscal year ended December 31, 1989,
                   File No. 1-4955).
 
  10.1(d)          Amendment No. 3 to Power Purchase Agreement between HECO and Kalaeloa Partners, L.P.,
                   dated December 10, 1991 (Exhibit 10.2(e) to HECO's Annual Report on Form 10-K for the
                   fiscal year ended December 31, 1991, File No. 1-4955).
 
  10.2             Power Purchase Agreement between AES Barbers Point, Inc. and HECO, entered into on
                   March 25, 1988 (Exhibit 10(a) to HECO's Quarterly Report on Form 10-Q for the quarter
                   ended March 31, 1988, File No. 1-4955).
 
  10.2(a)          Agreement between HECO and AES Barbers Point, Inc., pursuant to letters dated May 10,
                   1988 and April 20, 1988 (Exhibit 10.4 to HECO's Annual Report on
                   Form 10-K for fiscal year ended December 31, 1988, File No. 1-4955).
 
  10.2(b)          Amendment No. 1, entered into as of August 28, 1988, to Power Purchase Agreement
                   between AES Barbers Point, Inc. and HECO (Exhibit 10 to HECO's Quarterly Report on
                   Form 10-Q for the quarter ended September 30, 1989, File No. 1-4955).
 
</TABLE> 

                                       67
<PAGE>
 
<TABLE> 
<CAPTION>
EXHIBIT NO.                                      DESCRIPTION
- -----------                                      -----------
<S>                <C> 
  10.2(c)          HECO's Conditional Notice of Acceptance to AES Barbers Point, Inc. dated January 15,
                   1990 (Exhibit 10.3(c) to HECO's Annual Report on Form 10-K for the fiscal year ended
                   December 31, 1989, File No. 1-4955).
 
  10.3             Amended and Restated Power Purchase Agreement between Hilo Coast Processing Company
                   and HELCO dated March 24, 1995 (Exhibit 10 to HECO's Quarterly Report on Form 10-Q
                   for the quarter ended March 31, 1995, File No. 1-4955).
 
  10.4             Agreement between MECO and Hawaiian Commercial & Sugar Company pursuant to letters
                   dated November 29, 1988 and November 1, 1988 (Exhibit 10.8 to HECO's Annual Report on
                   Form 10-K for the fiscal year ended December 31, 1988,
                   File No. 1-4955).
 
  10.4(a)          Amended and Restated Power Purchase Agreement by and between A&B-Hawaii, Inc.,
                   through its division, Hawaiian Commercial & Sugar Company, and MECO, dated November
                   30, 1989 (Exhibit 10(e) to HECO's Quarterly Report on Form 10-Q for the quarter ended
                   September 30, 1990, File No. 1-4955).
 
  10.4(b)          First Amendment to Amended and Restated Power Purchase Agreement by and between
                   A&B-Hawaii, Inc., through its division, Hawaiian Commercial & Sugar Company, and
                   MECO, dated November 1, 1990, amending the Amended and Restated Power Purchase
                   Agreement dated November 30, 1989 (Exhibit 10(f) to HECO's Quarterly Report on Form
                   10-Q for the quarter ended September 30, 1990, File No. 1-4955).
 
 *10.4(c)          Letter agreement dated December 11, 1997 to Extend Term of Amended and Restated Power
                   Purchase Agreement Between A&B-Hawaii, Inc., through its division, Hawaiian
                   Commercial & Sugar Company, and MECO dated November 30, 1989, as Amended on November
                   1, 1990.
 
  10.5             Purchase Power Contract between HELCO and Thermal Power Company dated March 24, 1986
                   (Exhibit 10(a) to HECO's Quarterly Report on Form 10-Q for the quarter ended June 30,
                   1989, File No. 1-4955).
 
  10.5(a)          Firm Capacity Amendment between HELCO and Puna Geothermal Venture (assignee of AMOR
                   VIII, who is the assignee of Thermal Power Company) dated July 28, 1989 to Purchase
                   Power Contract between HELCO and Thermal Power Company dated March 24, 1986 (Exhibit
                   10(b) to HECO's Quarterly Report on Form 10-Q for the quarter ended June 30, 1989,
                   File No. 1-4955).
 
 *10.5(b)          Amendment made in October 1993 to Purchase Power Contract between HELCO and Puna
                   Geothermal Venture dated March 24, 1986, as amended.
 
 *10.5(c)          Third Amendment dated March 7, 1995 to the Purchase Power Contract between HELCO and
                   Puna Geothermal Venture dated March 24, 1986, as amended.
 
  10.5(d)          Performance Agreement and Fourth Amendment dated February 12, 1996 to the Purchase
                   Power Contract between HELCO and Puna Geothermal Venture dated March 24, 1986, as
                   amended (Exhibit 10.5(b) to HECO's Annual Report on Form 10-K for the fiscal year 
                   ended December 31, 1995, File No. 1-4955).
 
  10.6             Purchase Power Contract between HECO and the City and County of Honolulu dated March
                   10, 1986 (Exhibit 10.9 to HECO's Annual Report on Form 10-K for the fiscal year ended
                   December 31, 1989, File No. 1-4955).
</TABLE> 

                                       68
<PAGE>
 
<TABLE> 
<CAPTION>
EXHIBIT NO.                                      DESCRIPTION
- -----------                                      -----------
<S>                <C> 
  10.6(a)          Firm Capacity Amendment, dated April 8, 1991, to Purchase Power Contract, dated March
                   10, 1986, by and between HECO and the City & County of Honolulu (Exhibit 10 to HECO's
                   Quarterly Report on Form 10-Q for the quarter ended March 31, 1991, File No. 1-4955).
 
 *10.6(b)          Amendment No. 2 to Purchase Power Contract Between HECO and City and County of
                   Honolulu dated March 10, 1986.
 
 *10.7             Power Purchase Agreement between Encogen Hawaii, L.P. and HELCO dated October 22,
                   1997. The following attachments were omitted from Exhibit no. 10.7: Attachment C,
                   "Selected portions of the North American Electric Reliability Council Generating
                   Availability Data System Data Reporting Instructions dated October 1996" and
                   Attachment E, "Form of the Interconnection Agreement between Encogen Hawaii, L.P. and
                   HELCO" - provided in final form as Exhibit 10.7(a).
 
 *10.7(a)          Interconnection Agreement between Encogen Hawaii, L.P. and HELCO dated October 22,
                   1997.
 
 *10.8             Low Sulfur Fuel Oil Supply Contract by and between Chevron and HECO dated as of
                   November 14, 1997 (confidential treatment has been requested for portions of this
                   exhibit).
 
 *10.9             Inter-Island Industrial Fuel Oil and Diesel Fuel Supply Contract by and between
                   Chevron and HECO, MECO, HELCO, HTB and YB dated as of November 14, 1997 (confidential
                   treatment has been requested for portions of this exhibit).
 
 *10.10            Facilities and Operating Contract by and between Chevron and HECO dated as of
                   November 14, 1997 (confidential treatment has been requested for portions of this
                   exhibit).
 
 *10.11            Low Sulfur Fuel Oil Supply Contract by and between BHP and HECO dated as of November
                   14, 1997 (confidential treatment has been requested for portions of this exhibit).
 
 *10.12            Inter-Island Industrial Fuel Oil and Diesel Fuel Supply Contract by and between BHP
                   and HECO, MECO and HELCO dated November 14, 1997 (confidential treatment has been
                   requested for portions of this exhibit).
 
  10.13            Contract of private carriage by and between HITI and HELCO dated November 10, 1993
                   (Exhibit 10.13 to HECO's Annual Report on Form 10-K for the fiscal year ended
                   December 31, 1993, File No. 1-4955).
 
 *10.13(a)         Extension, dated December 1, 1997, of the contract of private carriage by and between
                   HITI and HELCO dated November 10, 1993.
 
  10.14            Contract of private carriage by and between HITI and MECO dated November 12, 1993
                   (Exhibit 10.14 to HECO's Annual Report on Form 10-K for the fiscal year ended
                   December 1, 1993, File No. 1-4955).
 
 *10.14(a)         Extension, dated December 1, 1997, of the contract of private carriage by and between
                   HITI and MECO dated November 12, 1993.
 
  10.15            HECO Nonemployee Directors' Deferred Compensation Plan (Exhibit 10.16 to HECO's
                   Annual Report on Form 10-K for the fiscal year ended December 31, 1990, File No.
                   1-4955).
</TABLE> 

                                       69
<PAGE>
 
<TABLE> 
<CAPTION>
EXHIBIT NO.                                      DESCRIPTION
- -----------                                      -----------
<S>                <C> 
   10.16           HEI and HECO Executives' Deferred Compensation Agreement. The agreement pertains to
                   and is substantially identical for all the HEI and HECO executive officers (Exhibit
                   10.15 to HEI's Annual Report on Form 10-K for the fiscal year ended December 31,
                   1991, File No. 1-8503).
 
   11              Computation of Earnings Per Share of Common Stock. See note on page 2 of HECO's 1997
                   Annual Report to Stockholder attached as HECO Exhibit 13 hereto.
 
  *12.2            Computation of Ratio of Earnings to Fixed Charges. Filed herein as page 74.
 
   13              Pages 2 to 34 and 36 of HECO's 1997 Annual Report to Stockholder (with the exception
                   of the data incorporated by reference in Part I, Part II, Part III and Part IV, no
                   other data appearing in the 1997 Annual Report to Stockholder is to be deemed filed
                   as part of this Form 10-K Annual Report) (HECO Exhibit 13.2 to HECO's Current Report
                   on Form 8-K dated February 27, 1998, File No. 1-4955).
 
  *21.2            Subsidiaries of HECO. Filed herein as page 76.
 
  *27.2            HECO and subsidiaries financial data schedule, December 31, 1997 and year ended
                   December 31, 1997.
 
  *99.2            Reconciliation of electric utility operating income per HEI and HECO Consolidated
                   Statements of Income. Filed herein as page 78.
</TABLE>

                                       70
<PAGE>
 
                                                                  HEI Exhibit 11


                       Hawaiian Electric Industries, Inc.
                       COMPUTATION OF EARNINGS PER SHARE
                                OF COMMON STOCK
            Years ended December 31, 1997, 1996, 1995, 1994 and 1993



<TABLE>
<CAPTION>
(in thousands,
except per share amounts)          1997               1996               1995               1994                1993
- ------------------------------------------------------------------------------------------------------------------------
<S>                            <C>                <C>                <C>                <C>                <C>
 
NET INCOME (LOSS)
 
Continuing operations.......        $86,442            $78,658            $77,493            $73,030            $ 61,684
Discontinued operations.....             --                 --                 --                 --             (13,025)
                            ---------------    ---------------    ---------------    ---------------    ----------------
                                    $86,442            $78,658            $77,493            $73,030            $ 48,659
                            ===============    ===============    ===============    ===============    ================
 
WEIGHTED AVERAGE NUMBER OF
 COMMON SHARES OUTSTANDING..         31,375             30,310             29,187             28,137              25,938
                            ===============    ===============    ===============    ===============    ================
ADJUSTED WEIGHTED AVERAGE
 NUMBER OF COMMON SHARES
 OUTSTANDING................         31,470             30,388             29,248             28,193              25,989
                            ===============    ===============    ===============    ===============    ================
 
BASIC EARNINGS (LOSS) PER
 COMMON SHARE
 
Continuing operations.......        $  2.76            $  2.60            $  2.66            $  2.60            $   2.38
Discontinued operations.....             --                 --                 --                 --               (0.50)
                            ---------------    ---------------    ---------------    ---------------    ----------------
                                    $  2.76            $  2.60            $  2.66            $  2.60            $   1.88
                            ===============    ===============    ===============    ===============    ================
 
DILUTED EARNINGS (LOSS) PER
 COMMON SHARE
 
Continuing operations.......        $  2.75            $  2.59            $  2.65            $  2.59            $   2.37
Discontinued operations.....             --                 --                 --                 --               (0.50)
                            ---------------    ---------------    ---------------    ---------------    ----------------
                                    $  2.75            $  2.59            $  2.65            $  2.59            $   1.87
                            ===============    ===============    ===============    ===============    ================
</TABLE>

                                      71
<PAGE>

                                                  HEI Exhibit 12.1 (page 1 of 2)


                       Hawaiian Electric Industries, Inc.
               COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
            Years ended December 31, 1997, 1996, 1995, 1994 and 1993



<TABLE>
<CAPTION>
                                              1997                          1996                           1995
                                    ------------------------      -------------------------      ------------------------
(dollars in thousands)                 (1)            (2)            (1)             (2)            (1)             (2)
- -------------------------------------------------------------------------------------------------------------------------
<S>                                 <C>            <C>            <C>             <C>            <C>             <C> 
FIXED CHARGES
Total interest charges
 The Company (3).................   $140,422       $229,521       $129,647        $220,811       $117,494        $206,790
 Proportionate share of
  fifty-percent-owned persons....        569            569            751             751            867             867
Interest component of rentals....      2,973          2,973          3,583           3,583          3,857           3,857
Pretax preferred stock dividend
 requirements of subsidiaries....      9,986          9,986         10,731          10,731         11,433          11,433
Preferred securities
 distributions of trust          
 subsidiaries....................     10,600         10,600             --              --             --              --
                                    --------       --------       --------        --------       --------        --------
TOTAL FIXED CHARGES..............   $164,550       $253,649       $144,712        $235,876       $133,651        $222,947
                                    ========       ========       ========        ========       ========        ========
 
EARNINGS
Pretax income from continuing
 operations......................   $141,783       $141,783       $133,488        $133,488       $133,233        $133,233
Fixed charges, as shown..........    164,550        253,649        144,712         235,876        133,651         222,947
Interest capitalized
 The Company.....................     (6,442)        (6,442)        (7,177)         (7,177)        (6,337)         (6,337)
 Proportionate share of                          
  fifty-percent-owned persons....       (128)          (128)          (746)           (746)          (867)           (867)
                                    --------       --------       --------        --------       --------        --------
EARNINGS AVAILABLE FOR FIXED
 CHARGES.........................   $299,763       $388,862       $270,277        $361,441       $259,680        $348,976
                                    ========       ========       ========        ========       ========        ========
RATIO OF EARNINGS TO FIXED
 CHARGES.........................       1.82           1.53           1.87            1.53           1.94            1.57
                                    ========       ========       ========        ========       ========        ========
</TABLE>

(1) Excluding interest on ASB deposits.

(2) Including interest on ASB deposits.

(3) Interest on nonrecourse debt from leveraged leases is not included in total
    interest charges nor in interest expense in HEI's consolidated statements of
    income.

                                      72 
<PAGE>
 
                                                  HEI Exhibit 12.1 (page 2 of 2)


                       Hawaiian Electric Industries, Inc.
               COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
      Years ended December 31, 1997, 1996, 1995, 1994 and 1993--Continued




<TABLE>
<CAPTION>
                                                     1994                                 1993
                                          --------------------------          --------------------------
(dollars in thousands)                       (1)               (2)               (1)               (2)
- --------------------------------------------------------------------------------------------------------
<S>                                       <C>               <C>               <C>               <C> 
FIXED CHARGES
Total interest charges
 The Company (3)......................    $ 82,306          $158,815          $ 68,254          $145,905
 Proportionate share of
  fifty-percent-owned persons.........         539               539               564               564
Interest component of rentals.........       3,819             3,819             3,944             3,944
Pretax preferred stock dividend
 requirements of subsidiaries.........      11,899            11,899            11,018            11,018
                                      ------------     -------------     -------------     -------------
TOTAL FIXED CHARGES...................    $ 98,563          $175,072          $ 83,780          $161,431
                                      ============     =============     =============     =============
EARNINGS
Pretax income from continuing
 operations...........................    $126,049          $126,049          $108,770          $108,770
Fixed charges, as shown...............      98,563           175,072            83,780           161,431
Interest capitalized
 The Company..........................      (4,924)           (4,924)           (3,881)           (3,881)
 Proportionate share of
  fifty-percent-owned persons.........        (539)             (539)             (408)             (408)
                                      ------------     -------------     -------------     -------------
EARNINGS AVAILABLE FOR FIXED CHARGES..    $219,149          $295,658          $188,261          $265,912
                                      ============     =============     =============     =============
RATIO OF EARNINGS TO FIXED CHARGES....        2.22              1.69              2.25              1.65
                                      ============     =============     =============     =============
</TABLE>

(1) Excluding interest on ASB deposits.

(2) Including interest on ASB deposits.

(3) Interest on nonrecourse debt from leveraged leases is not included in total
    interest charges nor in interest expense in HEI's consolidated statements of
    income.

                                      73
<PAGE>
 
                                                               HECO Exhibit 12.2


                        Hawaiian Electric Company, Inc.
               COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
            Years ended December 31, 1997, 1996, 1995, 1994 and 1993



<TABLE>
<CAPTION>
(dollars in thousands)                       1997            1996            1995            1994            1993
- ---------------------------------------------------------------------------------------------------------------------
<S>                                      <C>             <C>             <C>             <C>             <C>
FIXED CHARGES
Total interest charges................       $ 48,778        $ 47,451        $ 44,377        $ 37,340        $ 35,287
Interest component of rentals.........            757             690             672             808             970
Pretax preferred stock dividend
 requirements of subsidiaries.........          4,150           4,358           4,494           4,651           3,425
Preferred securities distributions of
 trust subsidiary.....................          3,052              --              --              --              --
                                      -------------------------------------------------------------------------------
TOTAL FIXED CHARGES...................       $ 56,737        $ 52,499        $ 49,543        $ 42,799        $ 39,682
                                      ===============================================================================
EARNINGS
Income before preferred stock
 dividends of HECO....................       $ 81,849        $ 85,213        $ 77,023        $ 65,961        $ 56,126
Fixed charges, as shown...............         56,737          52,499          49,543          42,799          39,682
Income taxes (see note below).........         52,535          55,888          50,198          43,588          36,897
Allowance for borrowed funds used
 during construction..................         (6,190)         (5,862)         (5,112)         (4,043)         (3,869)
                                      -------------------------------------------------------------------------------
EARNINGS AVAILABLE FOR FIXED CHARGES..       $184,931        $187,738        $171,652        $148,305        $128,836
                                      ===============================================================================
RATIO OF EARNINGS TO FIXED CHARGES....           3.26            3.58            3.46            3.47            3.25
                                      ===============================================================================
 
Note:
Income taxes is comprised of the
 following:
 Income tax expense relating to
  operating income for regulatory
  purposes............................       $ 52,795        $ 56,170        $ 50,719        $ 43,820        $ 37,007
 Income tax benefit relating to
  nonoperating loss...................           (260)           (282)           (521)           (232)           (110)
                                      -------------------------------------------------------------------------------
                                             $ 52,535        $ 55,888        $ 50,198        $ 43,588        $ 36,897
                                      ===============================================================================
</TABLE>

                                      74
<PAGE>
 
                                                                HEI Exhibit 21.1


                       Hawaiian Electric Industries, Inc.
                         SUBSIDIARIES OF THE REGISTRANT
                                        


The following is a list of all subsidiaries of the registrant as of March 17,
1998:



<TABLE>
<CAPTION>
                                                                           State of incorporation or
                                 Name                                             organization
- ------------------------------------------------------------------------------------------------------
<S>                                                                       <C>
Hawaiian Electric Company, Inc., including subsidiaries Maui Electric
 Company, Limited, Hawaii Electric Light Company, Inc. and HECO                      Hawaii
 Capital Trust I.......................................................
 
 
HEI Investment Corp....................................................              Hawaii
 
Malama Pacific Corp., including subsidiaries Malama Waterfront Corp.,
  Malama Property Investment Corp., Malama Development Corp., Malama
   Realty Corp., Malama Elua Corp., TMG Service Corp., Malama Hoaloha
   Corp., Malama Mohala Corp. and Baldwin*Malama (a limited
   partnership in which Malama Development Corp. is the sole general
   partner)............................................................              Hawaii
 
Hawaiian Tug & Barge Corp., including subsidiary Young Brothers,
 Limited...............................................................              Hawaii
 
HEI Diversified, Inc., including subsidiary HEIDI Real Estate Corp.         Hawaii (except American
 and American Savings Bank, F.S.B. and its subsidiaries, American         Savings Bank, F.S.B., which
 Savings Investment Services Corp., ASB Service Corporation,                is federally chartered)
 AdCommunications, Inc. and American Savings Mortgage Co., Inc.
 
Pacific Energy Conservation Services, Inc..............................              Hawaii
 
HEI Power Corp., including subsidiary HEI Power Corp. Guam and Cayman
 Islands subsidiary, HEI Power Corp. International and its Cayman
 Islands subsidiaries, HEIPC Cambodia Ventures, HEIPC Phnom Penh Power
 (Limited), LLC, HEIPC Phnom Penh Power (General), LLC, HEIPC
 Philippine Ventures, HEIPC Philippine Development, LLC, HEIPC Lake
 Mainit Power, LLC, HEIPC Bulacan I and HEIPC Bulacan II and its             Hawaii, unless otherwise 
 Republic of Mauritius subsidiary, HEI Power Corp. China...............               noted            
 
Hycap Management, Inc., including subsidiary HEI Preferred Funding, LP
 (a limited partnership in which Hycap Management, Inc. is the sole
 general partner)......................................................             Delaware
 
Hawaiian Electric Industries Capital Trust I (a business trust)........             Delaware
 
Hawaiian Electric Industries Capital Trust II (a business trust).......             Delaware
 
Hawaiian Electric Industries Capital Trust III (a business trust)......             Delaware
</TABLE>

                                      75
<PAGE>
 
                                                               HECO Exhibit 21.2


                        Hawaiian Electric Company, Inc.
                         SUBSIDIARIES OF THE REGISTRANT
                                        



The following is a list of all subsidiaries of the registrant as of March 17,
1998:



<TABLE>
<CAPTION>
                                 Name                                        State of incorporation
- ------------------------------------------------------------------------------------------------------
<S>                                                                                <C>
 
Maui Electric Company, Limited.........................................              Hawaii
 
Hawaii Electric Light Company, Inc.....................................              Hawaii
 
HECO Capital Trust I (a business trust)................................             Delaware
</TABLE>
 
                                      76
<PAGE>
 
[KPMG Peat Marwick letterhead]
                                                                  HEI Exhibit 23



                           Accountants' Consent
                           --------------------



The Board of Directors
Hawaiian Electric Industries, Inc.:

We consent to incorporation by reference in Registration Statement Nos. 33-
56561, 33-58820 and 333-18809 on Form S-3 and in Registration Statement Nos. 33-
65234, 333-05667 and 333-02103 on Form S-8 of Hawaiian Electric Industries,
Inc., and in Registration Statement Nos. 333-18809-01, 333-18809-02, 333-18809-
03 and 333-18809-04 on Form S-3 of Hawaiian Electric Industries Capital Trust I,
Hawaiian Electric Industries Capital Trust II, Hawaiian Electric Industries
Capital Trust III and HEI Preferred Funding, LP of our report dated January 19,
1998, relating to the consolidated balance sheets of Hawaiian Electric
Industries, Inc. and subsidiaries as of December 31, 1997 and 1996, and the
related consolidated statements of income, retained earnings and cash flows for
each of the years in the three-year period ended December 31, 1997, which report
is incorporated by reference in the 1997 annual report on Form 10-K of Hawaiian
Electric Industries, Inc. We also consent to incorporation by reference of our
report dated January 19, 1998 relating to the financial statement schedules of
Hawaiian Electric Industries, Inc. in the aforementioned 1997 annual report on
Form 10-K, which report is included in said Form 10-K.



/s/ KPMG Peat Marwick LLP

Honolulu, Hawaii
March 17, 1998

                                      77
<PAGE>

                                                               HECO Exhibit 99.2

                        Hawaiian Electric Company, Inc.
                  RECONCILIATION OF ELECTRIC UTILITY OPERATING
                      INCOME PER HEI AND HECO CONSOLIDATED
                              STATEMENTS OF INCOME
                                        

<TABLE>
<CAPTION>
                                                                          Years ended December 31,
                                                          -----------------------------------------------------
(in thousands)                                                    1997              1996              1995
- ---------------------------------------------------------------------------------------------------------------
<S>                                                          <C>               <C>               <C>
Operating income from regulated and nonregulated
 activities before income taxes (per HEI Consolidated
 Statements of Income)....................................         $171,753          $173,613          $159,043
 
Deduct:
 Income taxes on regulated activities.....................          (52,795)          (56,170)          (50,719)
 Revenues from nonregulated activities....................           (8,768)           (9,442)           (6,732)
 
Add:
 Expenses from nonregulated activities....................              850               790             1,130
                                                          -----------------------------------------------------
Operating income from regulated activities after income
 taxes (per HECO Consolidated Statements of Income).......         $111,040          $108,791          $102,722
                                                          =====================================================
</TABLE>

                                      78 
<PAGE>
 
                                   SIGNATURES
                                        
  Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange
Act of 1934, the registrants have duly caused this report to be signed on their
behalf by the undersigned, thereunto duly authorized. The signatures of the
undersigned companies shall be deemed to relate only to matters having reference
to such companies and any subsidiaries thereof.

HAWAIIAN ELECTRIC INDUSTRIES, INC.              HAWAIIAN ELECTRIC COMPANY, INC.
                      (Registrant)                                 (Registrant)
 
By  /s/ Robert F. Mougeot                       By  /s/ Paul Oyer
  -------------------------------------           -----------------------------
    Robert F. Mougeot                               Paul A. Oyer
    Financial Vice President and                    Financial Vice President and
    Chief Financial Officer of HEI                  Treasurer of HECO
    (Principal Financial Officer of HEI)            (Principal Financial Officer
                                                    of HECO)
 
Date:  March 26, 1998                           Date:  March 26, 1998


  Pursuant to the requirements of the Securities Exchange Act of 1934, this
report has been signed below by the following persons on behalf of the
registrants and in the capacities indicated on March 26, 1998. The signature of
each of the undersigned shall be deemed to relate only to matters having
reference to the above-named companies and any subsidiaries thereof.

<TABLE>
<CAPTION>                                                                                             
SIGNATURE                                                  TITLE                                      
- ----------------------------------------                   ------------------------------------------- 
<S>                                                        <C>
 
 
/s/ Robert F. Clarke                                       President and Director of HEI
- ----------------------------------------                   Chairman of the Board of Directors of HECO
Robert F. Clarke                                           (Chief Executive Officer of HEI)
 
 
/s/ T. Michael May                                         Senior Vice President and Director of HEI
- ----------------------------------------                   President and Director of HECO
T. Michael May                                             (Chief Executive Officer of HECO)
 
 
/s/ Robert F. Mougeot                                      Financial Vice President and
- ----------------------------------------                   Chief Financial Officer of HEI
Robert F. Mougeot                                          (Principal Financial Officer of HEI)
 
 
/s/ Curtis Y. Harada                                       Controller of HEI
- ----------------------------------------                   (Principal Accounting Officer of HEI)
Curtis Y. Harada                                 
 
 
/s/ Paul Oyer                                              Financial Vice President, Treasurer and
- ----------------------------------------                   Director of HECO                     
Paul A. Oyer                                               (Principal Financial Officer of HECO) 
                                                 
</TABLE>


                                      79
<PAGE>
 
                             SIGNATURES (CONTINUED)

<TABLE>
<CAPTION>                                                                                              
SIGNATURE                                                  TITLE                                       
- ----------------------------------------                   ------------------------------------------- 
<S>                                                        <C> 

/s/ Ernest T. Shiraki                                      Controller of HECO
- ----------------------------------------                   (Principal Accounting Officer of HECO) 
Ernest T. Shiraki                                     
 
 
                                                           Director of HEI
- ----------------------------------------
Don E. Carroll
 
 
/s/ Edwin L. Carter                                        Director of HEI and HECO
- ----------------------------------------
Edwin L. Carter
 
 
/s/ Richard Henderson                                      Director of HEI and HECO
- ----------------------------------------
Richard Henderson
 
 
/s/ Victor Hao Li                                          Director of HEI
- ----------------------------------------
Victor Hao Li
 
 
/s/ Bill D. Mills                                          Director of HEI
- ----------------------------------------
Bill D. Mills
 
 
/s/ A. Maurice Myers                                       Director of HEI
- ----------------------------------------
A. Maurice Myers
</TABLE>

                                      80
<PAGE>
 
                             SIGNATURES (CONTINUED)

<TABLE>
<CAPTION>                                                                                              
SIGNATURE                                                  TITLE                                       
- ----------------------------------------                   ------------------------------------------- 
<S>                                                        <C> 

 
/s/ Diane J. Plotts                                        Director of HEI and HECO
- ----------------------------------------
Diane J. Plotts
 
 
/s/ James K. Scott                                         Director of HEI
- ----------------------------------------
James K. Scott
 
 
/s/ Oswald K. Stender                                      Director of HEI
- ----------------------------------------
Oswald K. Stender
 
 
/s/ Anne M. Takabuki                                       Director of HECO
- ----------------------------------------
Anne M. Takabuki
 
 
/s/ Kelvin H. Taketa                                       Director of HEI
- ----------------------------------------
Kelvin H. Taketa
 
 
/s/ Jeffrey N. Watanabe                                    Director of HEI
- ----------------------------------------
Jeffrey N. Watanabe
 
 
/s/ Paul C. Yuen                                           Director of HECO
- ----------------------------------------
Paul C. Yuen
</TABLE>

                                      81

<PAGE>
 
                                                              HEI Exhibit 3(i).3
                                                              ------------------



Filing Fee - $50.00                                              DOMESTIC PROFIT

Dishonored Check - $15.00 Fee
Plus Interest Charges



                                STATE OF HAWAII
                                        
                  DEPARTMENT OF COMMERCE AND CONSUMER AFFAIRS
                         BUSINESS REGISTRATION DIVISION
                              1010 Richards Street
               Mailing Address:  P.O. Box 40, Honolulu, HI  96810

                                        
   STATEMENT OF ISSUANCE OF SHARES OF PREFERRED OR SPECIAL CLASSES IN SERIES
                   (SECTION 415-16, HAWAII REVISED STATUTES)



                                        
   The undersigned, duly authorized officers of the corporation   submitting
this Statement, certify as follows:



1.  The name of the corporation is:

                      HAWAIIAN ELECTRIC INDUSTRIES, INC.
    --------------------------------------------------------------------------



2. A copy of the resolution establishing and designating the series, and fixing
   and determining the relative rights and preferences of the new shares is
   attached.



3. The resolution was adopted on:    October  28,   1997
                                     -------------------
                                      (Month  Day  Year)


4.  The resolution was adopted by the Board of Directors.


We certify under the penalties of Section 415-136, Hawaii Revised Statutes, that
we have read the above statements, and that the same are true and correct.


Witness our hands this   28th   day of   October  , 1997.
                       --------        -----------    -- 



     /s/ Robert F. Clarke       /s/ Robert F. Mougeot
    ---------------------      ----------------------
     Robert F. Clarke           Robert F. Mougeot
     President                  Financial Vice President
<PAGE>
 
                      RESOLUTION OF THE BOARD OF DIRECTORS


                                       OF



                       HAWAIIAN ELECTRIC INDUSTRIES, INC.



                            Authorizing an Issue of

                 Series A Junior Participating Preferred Stock

                           Adopted - October 28, 1997
                           -------   ----------------



  WHEREAS, Hawaiian Electric Industries, Inc. (the "corporation") has an
authorized capital stock of one hundred million (100,000,000) shares of Common
Stock without par value and ten million (10,000,000) shares of Preferred Stock
without par value, of which 31,693,971 shares of Common Stock were issued and
outstanding as of September 30, 1997 and no shares of Preferred Stock were
issued and outstanding as of the date hereof; and

  WHEREAS, the corporation acting through its Board of Directors has power under
law and its Restated Articles of Incorporation, as amended, to issue its
authorized Preferred Stock in one or more series having such terms, preferences,
voting powers, restrictions and qualifications as shall be fixed in the
resolutions authorizing each such series; and

  WHEREAS, it is deemed advisable that the corporation authorize a series of
500,000 shares of Preferred Stock, without par value, designated as the
corporation's Series A Junior Participating Preferred Stock and having the
preferences, voting powers, restrictions and qualifications thereof hereinafter
set forth.

  NOW, THEREFORE, BE IT RESOLVED, that pursuant to the authority vested in the
Board of Directors of this corporation in accordance with the provisions of its
Restated Articles of Incorporation, as amended, and by law, a series of
Preferred Stock of the corporation be and it hereby is created, and that the
designation and

                                       1
<PAGE>
 
amount thereof and the terms, voting powers, preferences and relative,
participating, optional and other special rights of the shares of such series,
and the qualifications, limitations or restrictions thereof are as follows:

  Section 1.  Designation and Amount.  The shares of such series shall be
              ----------------------                                     
designated as "Series A Junior Participating Preferred Stock" and the number of
shares constituting such series shall be 500,000.

  Section 2.  Dividends and Distributions.
              --------------------------- 

  (A)  Subject to the prior and superior rights of the holders of any shares of
any series of Preferred Stock hereafter created which ranks prior and superior
to the shares of Series A Junior Participating Preferred Stock with respect to
dividends, the holders of shares of Series A Junior Participating Preferred
Stock shall be entitled to receive, when, as and if declared by the Board of
Directors out of funds legally available for the purpose, quarterly dividends
payable in cash on the tenth (10th) day of December, March, June and September
in each year (each such date being referred to herein as a "Quarterly Dividend
Payment Date"), commencing on the first Quarterly Dividend Payment Date after
the first issuance of a share or fraction of a share of Series A Junior
Participating Preferred Stock, in an amount per share (rounded to the nearest
cent) equal to the greater of (a) $61.00 or (b) subject to the provision for
adjustment hereinafter set forth, 100 times the aggregate per share amount of
all cash dividends, and 100 times the aggregate per share amount (payable in
kind) of all noncash dividends or other distributions other than a dividend
payable in shares of Common Stock or a subdivision of the outstanding shares of
Common Stock (by reclassification or otherwise), declared on the Common Stock,
of the corporation (the "Common Stock") since the immediately preceding
Quarterly Dividend Payment Date, or, with respect to the first Quarterly
Dividend Payment Date, since the first issuance of any share or fraction of a
share of Series A Junior Participating Preferred Stock.  In the event the
corporation shall at any time after October 28, 1997 (the "Rights Declaration
Date") (i) declare any dividend on Common Stock payable in shares of

                                       2
<PAGE>
 
Common Stock, (ii) subdivide the outstanding Common Stock, or (iii) combine the
outstanding Common Stock into a smaller number of shares, then in each such case
the amount to which holders of shares of Series A Junior Participating Preferred
Stock were entitled immediately prior to such event under clause (b) of the
preceding sentence shall be adjusted by multiplying such amount by a fraction
the numerator of which is the number of shares of Common Stock outstanding
immediately after such event and the denominator of which is the number of
shares of Common Stock that were outstanding immediately prior to such event.

  (B)  The corporation shall declare a dividend or distribution on the Series A
Junior Participating Preferred Stock as provided in Paragraph (A) above
immediately after it declares a dividend or distribution on the Common Stock
(other than a dividend payable in shares of Common Stock); provided that, in the
event no dividend or distribution shall have been declared on the Common Stock
during the period between any Quarterly Dividend Payment Date and the next
subsequent Quarterly Dividend Payment Date, a dividend of $61.00 per share on
the Series A Junior Participating Preferred Stock shall nevertheless be payable
on such subsequent Quarterly Dividend Payment Date.


  (C)  Dividends shall begin to accrue and be cumulative on outstanding shares
of Series A Junior Participating Preferred Stock from the Quarterly Dividend
Payment Date next preceding the date of issue of such shares of Series A Junior
Participating Preferred Stock, unless the date of issue of such shares is prior
to the record date for the first Quarterly Dividend Payment Date, in which case
dividends on such shares shall begin to accrue from the date of issue of such
shares, or unless the date of issue is a Quarterly Dividend Payment Date or is a
date after the record date for the determination of holders of shares of Series
A Junior Participating Preferred Stock entitled to receive a quarterly dividend
and before such Quarterly Dividend Payment Date, in either of which events such
dividends shall begin to accrue and be cumulative from such Quarterly Dividend
Payment Date.  Accrued but unpaid dividends shall not bear interest. Dividends
paid on the shares of Series A

                                       3
<PAGE>
 
Junior Participating Preferred Stock in an amount less than the total amount of
such dividends at the time accrued and payable on such shares shall be allocated
pro rata on a sharebyshare basis among all such shares at the time outstanding.
The Board of Directors may fix a record date for the determination of holders of
shares of Series A Junior Participating Preferred Stock entitled to receive
payment of a dividend or distribution declared thereon, which record date shall
be no more than 30 days prior to the date fixed for the payment thereof.

  Section 3.  Voting Rights.  The holders of shares of Series A Junior
              -------------                                           
Participating Preferred Stock shall have the following voting rights:

  (A)  Subject to the provision for adjustment hereinafter set forth, each share
of Series A Junior Participating Preferred Stock shall entitle the holder
thereof to 100 votes on all matters submitted to a vote of the stockholders of
the corporation.  In the event the corporation shall at any time after the
Rights Declaration Date (i) declare any dividend on Common Stock payable in
shares of Common Stock, (ii) subdivide the outstanding Common Stock, or (iii)
combine the outstanding Common Stock into a smaller number of shares, then in
each such case the number of votes per share to which holders of shares of
Series A Junior Participating Preferred Stock were entitled immediately prior to
such event shall be adjusted by multiplying such number by a fraction the
numerator of which is the number of shares of Common Stock outstanding
immediately after such event and the denominator of which is the number of
shares of Common Stock that were outstanding immediately prior to such event.

  (B)  Except as otherwise provided herein or by law, the holders of shares of
Series A Junior Participating Preferred Stock and the holders of shares of
Common Stock shall vote together as one class on all matters submitted to a vote
of stockholders of the corporation.

  (C)  (i)  If at any time dividends on any Series A Junior Participating
Preferred Stock shall be in arrears in an amount equal to six (6) quarterly
dividends

                                       4
<PAGE>
 
thereon, the occurrence of such contingency shall mark the beginning of a period
(herein called a "default period") which shall extend until such time when all
accrued and unpaid dividends for all previous quarterly dividend periods and for
the current quarterly dividend period on all shares of Series A Junior
Participating Preferred Stock then outstanding shall have been declared and paid
or set apart for payment.  During each default period, all holders of Series A
Junior Participating Preferred Stock with dividends in arrears in an amount
equal to six (6) quarterly dividends thereon, voting as a class together with
holders of Preferred Stock who, by the terms thereof, are then entitled to vote
thereon, irrespective of series, shall have the right to elect two (2)
directors, which directors shall be in addition to the number of directors
otherwise then provided for.  Such right to elect two directors is in addition
to the voting rights afforded holders of Series A Junior Participating Preferred
Stock set forth in Section 3(B) above.

  (ii)  During any default period, such voting right of the holders of Series A
Junior Participating Preferred Stock may be exercised initially at a special
meeting called pursuant to subparagraph (iii) of this Section 3(C) or at any
annual meeting of stockholders, and thereafter at annual meetings of
stockholders, provided that neither such voting right nor the right of the
holders of any other series of Preferred Stock, if any, to increase, in certain
cases, the authorized number of directors shall be exercised unless the holders
of ten percent (10%) in number of shares of Preferred Stock outstanding shall be
present in person or by proxy.  The absence of a quorum of the holders of Common
Stock shall not affect the exercise by the holders of Preferred Stock of such
voting right.  At any meeting at which the holders of Preferred Stock shall
exercise such voting right initially during an existing default period, they
shall have the right, voting as a class, to elect directors to fill such
vacancies, if any, in the Board of Directors as may then exist up to two (2)
directors or, if such right is exercised at an annual meeting, to elect two (2)
directors.  If the number which may be so elected at any special meeting does
not amount to the required number, the holders of the Preferred Stock shall have
the right to make such increase in the number of directors as shall

                                       5
<PAGE>
 
be necessary to permit the election by them of the required number.  After the
holders of the Preferred Stock shall have exercised their right to elect
directors in any default period and during the continuance of such period, the
number of directors shall not be increased or decreased except by vote of the
holders of Preferred Stock as herein provided or pursuant to the rights of any
equity securities ranking senior to or pari passu with the Series A Junior
                                       ---- -----                         
Participating Preferred Stock.

  (iii)  Unless the holders of Preferred Stock shall, during an existing default
period, have previously exercised their right to elect directors, the Board of
Directors may order, or any stockholder or stockholders owning in the aggregate
not less than ten percent (10%) of the total number of shares of Preferred Stock
outstanding, irrespective of series, may request, the calling of a special
meeting of the holders of Preferred Stock, which meeting shall thereupon be
called by the President, a VicePresident or the Secretary of the corporation.
Notice of such meeting and of any annual meeting at which holders of Preferred
Stock are entitled to vote pursuant to this Paragraph (C)(iii) shall be given to
each holder of record of Preferred Stock by mailing a copy of such notice to him
at his last address as the same appears on the books of the corporation.  Such
meeting shall be called for a time not earlier than 20 days and not later than
60 days after such order or request or in default of the calling of such meeting
within 60 days after such order or request, such meeting may be called on
similar notice by any stockholder or stockholders owning in the aggregate not
less than ten percent (10%) of the total number of shares of Preferred Stock
outstanding.  Notwithstanding the provisions of this Paragraph (C)(iii), no such
special meeting shall be called during the period within 60 days immediately
preceding the date fixed for the next annual meeting of the stockholders.

  (iv)  In any default period, the holders of Common Stock, and other classes of
stock of the corporation if applicable, shall continue to be entitled to elect
the whole number of directors until the holders of Preferred Stock shall have
exercised their right to elect two (2) directors voting as a class, after the
exercise

                                       6
<PAGE>
 
of which right (x) the directors so elected by the holders of Preferred Stock
shall continue in office until their successors shall have been elected by such
holders or until the expiration of the default period, and (y) any vacancy in
the Board of Directors may (except as provided in Paragraph (C)(ii) of this
Section 3) be filled by vote of a majority of the remaining directors
theretofore elected by the holders of the class of stock which elected the
director whose office shall have become vacant.  References in this Paragraph
(C) to directors elected by the holders of a particular class of stock shall
include directors elected by such directors to fill vacancies as provided in
clause (y) of the foregoing sentence.

  (v)  Immediately upon the expiration of a default period, (x) the right of the
holders of Preferred Stock as a class to elect directors shall cease, (y) the
term of any directors elected by the holders of Preferred Stock as a class shall
terminate, and (z) the number of directors shall be such number as may be
provided for in the certificate of incorporation or bylaws irrespective of any
increase made pursuant to the provisions of Paragraph (C)(ii) of this Section 3
(such number being subject, however, to change thereafter in any manner provided
by law or in the certificate of incorporation or bylaws).  Any vacancies in the
Board of Directors effected by the provisions of clauses (y) and (z) in the
preceding sentence may be filled by a majority of the remaining directors.

  (D)  Except as set forth herein, holders of Series A Junior Participating
Preferred Stock shall have no special voting rights and their consent shall not
be required (except to the extent they are entitled to vote with holders of
Common Stock as set forth herein) for taking any corporate action.

  Section 4.  Certain Restrictions.
              -------------------- 

  (A)  Whenever quarterly dividends or other dividends or distributions payable
on the Series A Junior Participating Preferred Stock as provided in Section 2
are in arrears, thereafter and until all accrued and unpaid dividends and
distributions, whether or not de-

                                       7
<PAGE>
 
clared, on shares of Series A Junior Participating Preferred Stock outstanding
shall have been paid in full, the corporation shall not


     (i)  declare or pay dividends on, make any other distributions on, or
   redeem or purchase or otherwise acquire for consideration any shares of stock
   ranking junior (either as to dividends or upon liquidation, dissolution or
   winding up) to the Series A Junior Participating Preferred Stock;

     (ii)  declare or pay dividends on or make any other distributions on any
   shares of stock ranking on a parity (either as to dividends or upon
   liquidation, dissolution or winding up) with the Series A Junior
   Participating Preferred Stock, except dividends paid ratably on the Series A
   Junior Participating Preferred Stock and all such parity stock on which
   dividends are payable or in arrears in proportion to the total amounts to
   which the holders of all such shares are then entitled;

     (iii)  redeem or purchase or otherwise acquire for consideration shares of
   any stock ranking on a parity (either as to dividends or upon liquidation,
   dissolution or winding up) with the Series A Junior Participating Preferred
   Stock, provided that the corporation may at any time redeem, purchase or
   otherwise acquire shares of any such parity stock in exchange for shares of
   any stock of the corporation ranking junior (either as to dividends or upon
   dissolution, liquidation or winding up) to the Series A Junior Participating
   Preferred Stock; or

     (iv)  purchase or otherwise acquire for consideration any shares of Series
   A Junior Participating Preferred Stock, or any shares of stock ranking on a
   parity with the Series A Junior Participating Preferred Stock, except in
   accordance with a purchase offer made in writing or by publication (as
   determined by the

                                       8
<PAGE>
 
   Board of Directors) to all holders of such shares upon such terms as the
   Board of Directors, after consideration of the respective annual dividend
   rates and other relative rights and preferences of the respective series and
   classes, shall determine in good faith will result in fair and equitable
   treatment among the respective series or classes.

  (B)  The corporation shall not permit any subsidiary of the corporation to
purchase or otherwise acquire for consideration any shares of stock of the
corporation unless the corporation could, under Paragraph (A) of this Section 4,
purchase or otherwise acquire such shares at such time and in such manner.

  Section 5.  Reacquired Shares.  Any shares of Series A Junior Participating
              -----------------                                              
Preferred Stock purchased or otherwise acquired by the corporation in any manner
whatsoever shall be retired and cancelled promptly after the acquisition
thereof.  All such shares shall upon their cancellation become authorized but
unissued shares of Preferred Stock and may be reissued as part of a new series
of Preferred Stock to be created by resolution or resolutions of the Board of
Directors, subject to the conditions and restrictions on issuance set forth
herein.

  Section 6.  Liquidation, Dissolution or Winding Up.
              -------------------------------------- 

  (A)  Upon any liquidation (voluntary or otherwise), dissolution or winding up
of the corporation, no distribution shall be made to the holders of shares of
stock ranking junior (either as to dividends or upon liquidation, dissolution or
winding up) to the Series A Junior Participating Preferred Stock unless, prior
thereto, the holders of shares of Series A Junior Participating Preferred Stock
shall have received an amount equal to $100 per share of Series A Participating
Preferred Stock, plus an amount equal to accrued and unpaid dividends and
distributions thereon, whether or not declared, to the date of such payment (the
"Series A Liquidation Preference"). Following the payment of the full amount of
the Series A Liquidation Preference, no additional distributions shall be made
to the holders of

                                       9
<PAGE>
 
shares of Series A Junior Participating Preferred Stock unless, prior thereto,
the holders of shares of Common Stock shall have received an amount per share
(the "Common Adjustment") equal to the quotient obtained by dividing (i) the
Series A Liquidation Preference by (ii) 100 (as appropriately adjusted as set
forth in subparagraph (C) below to reflect such events as stock splits, stock
dividends and recapitalizations with respect to the Common Stock) (such number
in clause (ii), the "Adjustment Number").  Following the payment of the full
amount of the Series A Liquidation Preference and the Common Adjustment in
respect of all outstanding shares of Series A Junior Participating Preferred
Stock and Common Stock, respectively (together with payment of the full amounts
due in respect of any series of Preferred Stock which ranks on a parity with the
Series A Junior Participating Preferred Stock), and without limitation on the
amounts due to any holders of any series of Preferred Stock which ranks on a
parity with the Series A Junior Participating Preferred Stock, holders of Series
A Junior Participating Preferred Stock and holders of shares of Common Stock
shall receive their ratable and proportionate share of the remaining assets to
be distributed in the ratio of the Adjustment Number to 1 with respect to such
Preferred Stock and Common Stock, on a per share basis, respectively.

  (B)  In the event, however, that there are not sufficient assets available to
permit payment in full of the Series A Liquidation Preference and the
liquidation preferences of all other series of Preferred Stock, if any, which
rank on a parity with the Series A Junior Participating Preferred Stock, then
such remaining assets shall be distributed ratably to the holders of such parity
shares in proportion to their respective liquidation preferences.  In the event,
however, that there are not sufficient assets available to permit payment in
full of the Common Adjustment, then such remaining assets shall be distributed
ratably to the holders of Common Stock.

  (C)  In the event the corporation shall at any time after the Rights
Declaration Date (i) declare any dividend on Common Stock payable in shares of
Common Stock, (ii) subdivide the outstanding Common Stock, or

                                       10
<PAGE>
 
(iii) combine the outstanding Common Stock into a smaller number of shares, then
in each such case the Adjustment Number in effect immediately prior to such
event shall be adjusted by multiplying such Adjustment Number by a fraction the
numerator of which is the number of shares of Common Stock outstanding
immediately after such event and the denominator of which is the number of
shares of Common Stock that were outstanding immediately prior to such event.

  Section 7.  Consolidation, Merger, etc.  In case the corporation shall enter
              --------------------------                                      
into any consolidation, merger, combination or other transaction in which the
shares of Common Stock are exchanged for or changed into other stock or
securities, cash and/or any other property, then in any such case the shares of
Series A Junior Participating Preferred Stock shall at the same time be
similarly exchanged or changed in an amount per share (subject to the provision
for adjustment hereinafter set forth) equal to 100 times the aggregate amount of
stock, securities, cash and/or any other property (payable in kind), as the case
may be, into which or for which each share of Common Stock is changed or
exchanged.  In the event the corporation shall at any time after the Rights
Declaration Date (i) declare any dividend on Common Stock payable in shares of
Common Stock, (ii) subdivide the outstanding Common Stock, or (iii) combine the
outstanding Common Stock into a smaller number of shares, then in each such case
the amount set forth in the preceding sentence with respect to the exchange or
change of shares of Series A Junior Participating Preferred Stock shall be
adjusted by multiplying such amount by a fraction the numerator of which is the
number of shares of Common Stock outstanding immediately after such event and
the denominator of which is the number of shares of Common Stock that were
outstanding immediately prior to such event.

  Section 8.  No Redemption.  The shares of Series A Junior Participating
              -------------                                              
Preferred Stock shall not be redeemable.

  Section 9.  Ranking.  The Series A Junior Participating Preferred Stock shall
              -------                                                          
rank junior to all other series of the corporation's Preferred Stock as to the

                                       11
<PAGE>
 
payment of dividends and the distribution of assets, unless the terms of any
such series shall provide otherwise.

  Section 10.  Amendment.  At any time when any shares of Series A Junior
               ---------                                                 
Participating Preferred Stock are outstanding, neither the Restated Articles of
Incorporation of the corporation nor the Statement of Issuance of Shares of
Preferred or Special Classes in Series shall be amended in any manner which
would materially alter or change the powers, preferences or special rights of
the Series A Junior Participating Preferred Stock so as to affect them adversely
without the affirmative vote of the holders of a majority or more of the
outstanding shares of Series A Junior Participating Preferred Stock, voting
separately as a class.

  Section 11.  Fractional Shares.  Series A Junior Participating Preferred Stock
               -----------------                                                
may be issued in fractions of a share which are integral multiples of one one-
hundredth of a share of Preferred Stock, which shall entitle the holder, in
proportion to such holder's fractional shares, to exercise voting rights,
receive dividends, participate in distributions and to have the benefit of all
other rights of holders of Series A Junior Participating Preferred Stock.

  FURTHER RESOLVED, that any two officers of the corporation be, and they hereby
are, authorized and directed to execute and file with the Department of Commerce
and Consumer Affairs of the State of Hawaii a "Statement of Issuance of Shares
of Preferred or Special Classes in Series," to which this resolution shall be
annexed.

                                       12

<PAGE>
 
                                                            HECO Exhibit 10.4(c)
                                                            --------------------


[ Maui Electric Company, Ltd. letterhead ]



                                                               December 11, 1997



Mr. Steve Holaday
Hawaiian Commercial & Sugar Company
P. O. Box 266
Puunene, HI  96784

Dear Mr. Holaday:

Re:  Agreement to Extend Term of Amended and Restated Power Purchase Agreement
     Between A&B Hawaii, Inc., through its division, Hawaiian Commercial & Sugar
     Company, and Maui Electric Company, Limited, dated November 30, 1989, as
     Amended on November 1, 1990

This will confirm and document the Agreement between A&B Hawaii, Inc., through
its division, Hawaiian Commercial & Sugar Company ("HC&S") and Maui Electric
Company, Limited ("MECO") to extend the term of the Amended and Restated Power
Purchase Agreement Between HC&S and MECO (the "Power Purchase Agreement") as
follows:

1.   The Power Purchase Agreement shall remain in full force and effect through
     December 31, 2000, and from year to year thereafter; subject to termination
     on or after January 1, 2001, on not less than two (2) years' prior written
     notice by either party.

2.   All other terms and conditions of the Power Purchase Agreement shall remain
     unmodified for the extended term set forth above.

3.   To the extent that this Agreement to extend the Power Purchase Agreement
     requires the approval of the Public Utilities Commission ("PUC") of the
     State of Hawaii, it is expressly understood and agreed that the obligations
     of MECO and HC&S hereunder are contingent upon the continuing approval of
     the PUC.
<PAGE>
 
If the foregoing meets with your approval, please execute the below
acknowledgment and return the original to me, retaining the duplicate original
for your files. MECO values its long-standing relationship with HC&S, and thanks
you for your willingness to work cooperatively to position both companies for
the future.


                             MAUI ELECTRIC COMPANY, LIMITED

                             By    /S/ T. Michael May
                                ---------------------

                             Its    Board Chairman
                                  ----------------

                             Date:    12/11/97
                                    ----------


                             By    /S/ William A. Bonnet
                                ------------------------

                             Its    President
                                  -----------

                             Date:    12/11/97
                                    ----------


Acknowledged and agreed:

A&B-HAWAII, INC., by its division
HAWAIIAN COMMERCIAL & SUGAR COMPANY

By    /S/ Steven Holaday
    --------------------

Its    Gen. Mgr.
     -----------

Date:    Dec., 12, 1997
       ----------------


By    /S/ Robert Kwok
    -----------------

Its    Vice President, Production
     ----------------------------

Date:    Dec., 12, 1997
       ----------------



Page 2

<PAGE>
 
                                                            HECO Exhibit 10.5(b)
                                                            --------------------



                AMENDMENT TO PURCHASE POWER CONTRACT, AS AMENDED
                ------------------------------------------------


     THIS AMENDMENT, made this ______ day of October, 1993, by HAWAII ELECTRIC
LIGHT COMPANY, INC., a Hawaii corporation ("Company"), and PUNA Geothermal
VENTURE, a Hawaii general partnership ("Seller");

                           R  E  C  I  T  A  L  S  :
                           -  -  -  -  -  -  -  -   

          A.   The Company and Thermal Power Company, as seller therein, had
previously entered into that certain Purchase Power Contract For Unscheduled
Energy made Available From A Qualifying Facility, dated March 24, 1986
("Purchase Power Contract"), which was subsequently approved by the Public
Utilities Commission ("PUC") in its Decision and Order ("D &  O") No. 8692,
filed in PUC Docket No. 5525 on March 25, 1986.

          B.   The Seller subsequently succeeded to the interest of Thermal
Power Company under the Purchase Power Contract.

          C.   The Company and the Seller entered into that certain Firm
Capacity Amendment To Purchase Power Contract Dated March 24, 1986, dated July
28, 1989 ("Firm Capacity Amendment"), which was subsequently approved by the PUC
in its D & O No. 10519, filed in PUC Docket No. 6498 on February 14, 1990.

          D.   The Seller's geothermal power project located in Kapoho, Hawaii
("Facility") was from its inception a "qualifying facility" ("QF"), under
Subchapter 2 of the "Standards for Small Power Production and Cogeneration,"
Hawaii Administrative Rules, Title 6, Chapter 74 ("PUC Standards").

          E.   As a result of a restructuring of the ownership of the Seller and
the Facility in connection with financing for the Facility, the Facility may,
following such restructuring, no longer qualify as a QF under the PUC Standards,
but such restructuring will not otherwise affect or modify the Seller's
capability of performing its obligations under the Purchase Power Contract, as
amended, and/or the rights of the Company thereunder.

          F.   The Company and the Seller firmly believe that the rates for
purchase set forth in the Purchase Power Contract, as amended, are fully
consistent with the provisions of H.R.S. (S)269-27.2 and continue to be in
furtherance of the State's policy to encourage the development of the State's

<PAGE>
 
renewable alternate energy resources, including the geothermal resources.

          G.   The company and the Seller further believe that it is in the best
interests of the parties to amend the Purchase Power Contract, as amended, to
(i) provide that the Facility shall be either (i) a QF or (ii) a producer of
electricity generated from nonfossil fuel sources and thus falling within the
meaning of Section 269-27.2, Hawaii Revised Statutes ("nonfossil fuel
producer"), and to advise the PUC of such amendment.

          NOW, THEREFORE, in consideration of the premises, the parties hereby
agree to amend the Purchase Power Contract and the Firm Capacity Amendment as
follows:

          1.   Amendments to the Purchase Power Contract.
               ----------------------------------------- 

          a.   The second WHEREAS clause on page 1 of the Purchase Power
Contract is amended by (i) deleting the following portion of that clause:

          "of a cogeneration facility or small power production facility which
          is a qualifying facility under Subchapter 2 of the PUC's Standards for
          Small Power Production and Cogeneration in the State of Hawaii,
          Chapter 74 of Title 6; and"

and (ii) substituting in lieu thereof the following new portion:

          "of a cogeneration facility or small power production facility which
          is (i) a qualifying facility under Subchapter 2 of the PUC's Standards
          for Small Power Production and Cogeneration in the State of Hawaii,
          Chapter 74 of Title 6, or (ii) a producer of electricity generated
          from nonfossil fuel sources and thus falling within the meaning of
          Section 269-27.2, Hawaii Revised Statutes ("nonfossil fuel producer");
          and"

          b.   APPENDIX E on page 19 of the Purchase Power Contract is amended
by deleting subparagraph 1.(a)(ii) in its entirety and substituting in lieu
thereof the following new subparagraphs l.(a)(ii):

          "(ii)     failure of the Seller's facility, upon its completion and
                    operation, to be (i) a qualifying facility under Subchapter
                    2 of the PUC's Standards for Small Power

                                       2
<PAGE>
 
                    Production and Cogeneration in the State of Hawaii, Chapter
                    74 of Title 6 in effect as of the date of this Contract, or
                    (ii) a nonfossil fuel producer falling within the meaning of
                    Section 269-27.2, Hawaii Revised Statutes; or"

          c.   All other references or requirements in the Purchase Power
Contract to the Facility being a "QF" or "qualifying facility" are similarly
amended by adding to each such reference or requirement the phrase "or nonfossil
fuel producer falling within the meaning of Section 269-27.2, Hawaii Revised
Statutes."

          2.   Amendments to the Firm Capacity Amendment.
               ----------------------------------------- 

          a.   The sixth (6th) WHEREAS clause on page 1 of the Firm Capacity
Amendment is amended by deleting that WHEREAS cause in its entirety and
substituting in lieu thereof the following new WHEREAS clause;

          "WHEREAS, the Seller's facility will be (i) a qualifying facility
          under Subchapter 2 of the PUC's Standards for Small Power Production
          and Cogeneration in the State of Hawaii, Chapter 74 of Title 6, or
          (ii) a facility which generates electricity from nonfossil fuel
          sources and thus falling within the meaning of Section 269-27.2,
          Hawaii Revised Statutes;"

          b.   All other references or requirements in the Firm Capacity
Amendment to the Facility being a "QF" or "qualifying facility" are similarly
amended by adding to each such reference or requirement the phrase "or nonfossil
fuel producer falling within the meaning of Section 269-27.2, Hawaii Revised
Statutes".

          3.   Continuing Effect.  Except as amended by this instrument, the
               -----------------                                            
Power Purchase Contract, as amended by the Firm Capacity Amendment, remains in
otherwise unmodified and in full force and effect.

          4.   Further Action.  The Company and the Seller shall take such
               --------------                                             
further action as may be necessary or desirable to implement the provisions, and
advise the PUC, of this Amendment to Purchase Power Contract, as amended, as
expeditiously as possible.

          5.   Counterparts.  This instrument may be executed in any number of
               ------------                                                   
counterparts, each of which shall be deemed an

                                       3
<PAGE>
 
original, and all of which together shall constitute one and the same
instrument.

          6.   Effective Date.  This Amendment to Purchase Power Contract, as
               --------------                                                
amended, shall become effective when signed by the Seller and the Company.

          IN WITNESS WHEREOF, the Company and the Seller have executed this
Amendment to Purchase Power Contract, as amended, as of the day and year first
above written.


                              HAWAII ELECTRIC LIGHT COMPANY, INC


                              By /s/ Warren H. W. Lee
                                 ------------------------
                                 Warren H. W. Lee
                                 Its President
                                 Date:  October 14, 1993

                              By /s/ Edward Y. Hirata
                                 ------------------------
                                 Edward Y. Hirata
                                 Its Vice President
                                 Date:  October 14, 1993



                              PUNA GEOTHERMAL VENTURE

                              By CE PUNA LIMITED PARTNERSHIP,
                                 a Maryland Limited partnership


                              By CE PUNA I, INC.,
                                 a Maryland corporation
                                 Its General Partners


                                 By /s/ Bruce M. Ambler
                                    -------------------
                                    Bruce M. Ambler
                                    Its President

                                       4
<PAGE>
 
STATE OF HAWAII               )
                              )     SS.
CITY AND COUNTY OF HONOLULU   )


          On this 14th day of October, 1993, before me personally appeared
WARREN H. W. LEE and EDWARD Y. HIRATA, to me personally known, who, being by me
duly sworn, did say that they are the President and Vice President,
respectively, of HAWAII ELECTRIC LIGHT COMPANY, INC., a Hawaii corporation, and
that the seal affixed to the foregoing instrument is the corporate seal of said
corporation and that said instrument was signed and sealed on behalf of said
corporation by authority of its Board of Directors, and the said officers
acknowledged said instrument to be the free act and deed of said corporation.



                              /s/ Wendy E. Oda
                              Notary Public, State of Hawaii

                              My Commission Expires:  8/25/95

<PAGE>
 
STATE OF MARYLAND      )
                       )    SS.
COUNTY OF BALTIMORE    )



          On this 19th day of October, l993, before me appeared Bruce M. Ambler,
to me personally known, who, being by me duly sworn, did say that he is the
President of CE PUNA I, INC, a Maryland corporation; that said corporation is a
general partner of CE Puna Limited Partnership, a Maryland limited partnership
named in the foregoing instrument; that said instrument was executed by said
corporation as the duly authorized general partner of and on behalf of CE Puna
Limited Partnership, and acknowledged that the seal affixed to the foregoing
instrument is the corporate seal of said corporation, and that said instrument
was signed and sealed on behalf of said corporation by authority of its Board of
Directors and in the name of and on behalf of said limited partnership, and said
officer acknowledged said instrument to be the free act and deed of said
corporation and as said general partner of said limited partnership.


                              /s/ Melissa A. Hill
                              Notary Public, State of Maryland
                              My Commission Expires:  September 24, 1996


<PAGE>
 
                                                            HECO Exhibit 10.5(c)
                                                            --------------------



                                THIRD AMENDMENT
                                     TO THE
                  PURCHASE POWER CONTRACT DATED MARCH 24, 1986
                                 AS AMENDED BY
                THE FIRM CAPACITY AMENDMENT DATED JULY 28, 1989


          THIS THIRD AMENDMENT ("Third Amendment" or "Agreement") is made this
7th day of March 1995, by and between HAWAII ELECTRIC LIGHT COMPANY, INC. (the
"Company" or "HELCO"), and PUNA GEOTHERMAL VENTURE (the "Seller" or "PGV").

          WHEREAS, the Company has entered into a Purchase Power Contract for
Unscheduled Energy Made Available From a Qualifying Facility (the "Unscheduled
Energy Contract"), dated March 24, 1986, with Thermal Power Company ("Thermal
Power");

          WHEREAS, the Hawaii Public Utilities Commission (the "PUC" or
"Commission") authorized the Company to include the purchased power costs of the
Unscheduled Energy Contract in its fuel clause by its Decision and Order No.
8692 dated March 25, 1986, in Docket No. 5525;

          WHEREAS, Thermal Power assigned the Unscheduled Energy Contract to
AMOR VIII with the Company's written consent on July 19, 1988;

          WHEREAS, AMOR VIII assigned the Unscheduled Energy Contract to Puna
Geothermal Ventures with the Company's written consent;

          WHEREAS, HELCO and PGV have entered into that certain Firm Capacity
Amendment to Purchase Power Contract, dated July 28, 1989 ("Firm Capacity
Amendment"), which amended the Unscheduled Energy Contract;

          WHEREAS, by Amendment to Purchase Power Contract, As Amended ("Second
Amendment") HELCO and PGV amended the Unscheduled Energy Contract and Firm
Capacity Amendment (the Unscheduled Energy Contract as amended by the Firm
Capacity Amendment and the Second Amendment, and as may be amended from time to
time, is referred to as the "Amended PPC").

          WHEREAS, a number of issues arose between the Company and Seller which
they settled in a Settlement Agreement dated March 7, 1995 ("Settlement
Agreement");

          WHEREAS, as part of the Settlement Agreement, the Company and Seller
agreed to amend the Amended PPC as reflected in the terms and conditions herein
and in "APPENDIX D, POWER PURCHASES BY COMPANY (Interim Period)" for the period
        ----------  --------------------------                                 
(the "Interim Period") starting with the Effective Date (as defined herein)
until the satisfaction by PGV of all of PGV's obligations under the Settlement
Agreement;
<PAGE>
 
          WHEREAS, subsequent to the Interim Period, HELCO and PGV desire to
revise the Amended PPC to reflect the parties' understanding of the Amended PPC
prior to the Interim Period as reflected in the terms and conditions herein and
in "APPENDIX D, POWER PURCHASES BY COMPANY (Subsequent to Interim Period)";
    ----------  --------------------------                                 

          WHEREAS, the Seller's facility will continue to be throughout the term
of this contract either (1) a qualifying, small power production facility under
Subchapter 2 of the PUC's Standards for Small Power Production and Cogeneration
in the State of Hawaii, Chapter 74 of Title 6 of the State's Administrative
Rules, or (2) a "non-fossil fuel producer" within the meaning of Section 269-
27.2, Hawaii Revised Statutes;

          WHEREAS, the Seller is not, and will continue not to be throughout the
term of the Amended PPC, as amended, an "Affiliated Interest" within the meaning
of Section 269-19.5, Hawaii Revised Statutes;

          NOW, THEREFORE, in consideration of the premises and the respective
promises herein, the Company and the Seller hereby agree to amend the Amended
PPC as follows:

          1.   Interim Period Appendix D.  Upon the Effective Date (as defined
               -------------------------                                      
herein), "APPENDIX D, POWER PURCHASE BY COMPANY", of the Amended PPC is deleted
          ----------  -------------------------                                
in its entirety and replaced with "APPENDIX D, POWER PURCHASE BY COMPANY
                                   ----------  -------------------------
(Interim Period)", which is attached hereto as Attachment A and incorporated
herein by reference.

          2.   Subsequent Period Appendix D.  Upon the satisfaction by PGV of
               ----------------------------                                  
all of PGV's monetary and energy obligations under the Settlement Agreement,
                                                                            
"APPENDIX D, POWER PURCHASE BY COMPANY (Interim Period)", shall be deleted in
- -----------  -------------------------                                       
its entirety and replaced with "APPENDIX D, POWER PURCHASE BY COMPANY
                                ----------  -------------------------
(Subsequent to Interim Period)", which is attached hereto as Attachment B and
incorporated herein by reference.

          3.   Affiliated Interest.  The Seller shall not sell or transfer more
               -------------------                                             
than a 10% equity interest to any person or entity, or enter into any other
transaction that would make the Seller an Affiliated Interest with the Company
as defined by Section 269-19.5, Hawaii Revised Statutes, without first notifying
the Company and receiving appropriate PUC approval, if any is required.  If the
PUC (or any other entity which has the authority to do so) finds that the Seller
is an Affiliated Interest with the Company, the Seller shall have 60 days to
take whatever action may be appropriate to render the relationship not to be an
Affiliated Interest.  The Company shall have the right to terminate the Amended
PPC, including this Third Amendment and any future amendments, if the PUC

                                       2
<PAGE>
 
prohibits the Company from recovering any payments made to the Seller under this
Amended PPC, as amended herein and from time to time, due to the effect of
Section 269-19.5, Hawaii Revised Statutes, relating to affiliated interests.

          4.   Continuing Effect.  To the extent not amended by this Third
               -----------------                                          
Amendment, the Amended PPC shall remain in full force and effect.

          5.   Further Performance.  Each Party hereto shall and does hereby
               -------------------                                          
agree to make, execute, deliver and cooperate with each other, as the case may
be, any and all agreements, instruments, documents, records and/or funds, as the
case may be, whatsoever required, necessary and/or convenient to effect and
consummate this Agreement and to permit performance of all acts required
hereunder.

          6.   Counterparts/Facsimile Signatures.  This Agreement may be
               ---------------------------------                        
executed and delivered by the parties hereto in any number of counterparts, each
of which shall be delivered an original or duplicate original, and all of which
together shall constitute one and the same instrument or agreement.
Counterparts may be exchanged by facsimile, which facsimile signatures shall be
effective for all purposes and treated in the same manner as physical
signatures.  Notwithstanding the foregoing, the party using facsimile signatures
agrees that it will promptly forward physically signed copies of this Agreement
to the other party.

          7.   Effective Date.  This Third Amendment becomes effective on the
               --------------                                                
earlier of sixty (60) calendar days from the date first above written or when
the PUC authorizes, by appropriate decision and order satisfactory to the Seller
and the Company, the Company's energy payments to the Seller hereunder to be
included in the Company's Fuel Clause pursuant to Rule 6-60-6, Standards For
                                                               -------------
Electric and Gas Utility Service, Title 6, Chapter 60, of the Hawaii
- --------------------------------                                    
Administrative Rules, or in the Company's base rates pursuant to Section 269-
16(b), Hawaii Revised Statutes, whichever occurs first ("Effective Date").

          8.   Denial Of Application.  Notwithstanding anything in this
               ---------------------                                   
Agreement to the contrary, in the event that the Commission denies the Company's
application to include energy payments to Seller in either the Company's Fuel
Clause pursuant to Rule 6-60-6, Standards For Electric and Gas Utility Service,
                                ---------------------------------------------- 
Title 6, Chapter 60, of the Hawaii Administrative Rules, or in the Company's
base rates pursuant to Section 269-16(b), Hawaii Revised Statutes, within sixty
(60) calendar days from the date first above written, then this Third Amendment
shall be null and void and of no further force and effect.

                                       3
<PAGE>
 
          IN WITNESS WHEREOF, the Company and the Seller have executed this
Third Amendment as of the day and year first above written.


                              HAWAII ELECTRIC LIGHT COMPANY, INC.

                              By: /s/ Warren H. W. Lee
                                  --------------------
                              Name: Warren H. W. Lee
                              Title: President


                              By: /s/ Edward Y. Hirata
                                  --------------------
                              Name: Edward Y. Hirata
                              Title: Vice President



                              PUNA GEOTHERMAL VENTURE

                              By AMOR VIII CORPORATION,
                                a Delaware corporation,
                                Its General Partner

                              By: /s/ Joseph B. Fahrendorf
                                  ------------------------
                              Name: Joseph B. Fahrendorf
                              Title: President


                              By CE PUNA L.P.,
                                a Maryland limited partnership,
                                Its General Partner

                                    By CE PUNA I, INC.,
                                     a Maryland corporation,
                                     Its General Partner

                                         By: /s/ Nicholas A. Yancich
                                             -----------------------
                                         Name: Nicholas A. Yancich
                                         Title: Vice President

                                       4
<PAGE>
 
STATE OF HAWAII              )
                             )    SS.
CITY AND COUNTY OF HONOLULU  )


          On this 7th day of March, 1995, before me personally appeared Warren
H. W. Lee and Edward Y. Hirata to me personally known, who, being by me duly
sworn, did say that they are the President and Vice President, respectively, of
HAWAII ELECTRIC LIGHT COMPANY, INC., a Hawaii corporation, and that foregoing
instrument was signed on behalf of HAWAII ELECTRIC LIGHT COMPANY, INC. by
authority of its Board of Directors, and said officers acknowledged said
instrument to be the free act and deed of HAWAII ELECTRIC LIGHT COMPANY, INC.



/s/ Marion S. Leong
- -------------------------------
Notary Public State of Hawaii
My Commission expires:  3-5-96
<PAGE>
 
STATE OF OREGON          )
                         )    SS.
COUNTY OF  CLACKAMAS     )


          On this 3rd day of March, 1995, before me personally appeared JOSEPH
B. FAHRENDORF to me personally known, who, being by me duly sworn, did say that
he/she is the PRESIDENT of AMOR VIII CORPORATION, a Delaware corporation; that
said corporation is a general partner of Puna Geothermal Venture, a Hawaii
general partnership, named in the foregoing instrument; that said instrument was
executed by said corporation as the duly authorized general partner of and on
behalf of Puna Geothermal Venture, and acknowledged that the seal affixed to the
foregoing instrument is the corporate seal of said corporation, and that said
instrument was signed and sealed on behalf of said corporation by authority of
its Board of Directors and in the name of and on behalf of Puna Geothermal
Venture, and said officer and acknowledged said instrument to be the free act
and deed of AMOR VIII Corporation as general partner of PUNA GEOTHERMAL VENTURE.



/s/ Aurora Magana
Notary Public State of Oregon
My Commission expires:  June 22, 1996
<PAGE>
 
STATE OF MARYLAND             )
                              )    SS.
COUNTY OF HARFORD             )


          On this 3rd day of March, 1995, before me appeared
Nicholas A. Yancich, to me personally known, who, being by me duly sworn, did
say that he/she is the Vice President of CE PUNA I, INC., a Maryland
corporation; that said corporation is a general partner of CE Puna Limited
Partnership, a Maryland limited partnership; that said CE Puna Limited
Partnership is a general partner of Puna Geothermal Venture, a Hawaii general
partnership named in the foregoing instrument; that said instrument was executed
by said corporation as the duly authorized general partner of and on behalf of
CE Puna Limited Partnership, as the duly authorized general partner of and on
behalf of Puna Geothermal Venture, and acknowledged that the seal affixed to the
foregoing instrument is the corporate seal of said corporation, and that said
instrument was signed and sealed on behalf of said corporation by authority of
its Board of Directors and in the name of and on behalf of CE Puna Limited
Partnership and in the name of and on behalf of Puna Geothermal Venture, and
said officer acknowledged said instrument to be the free act and deed of said
corporation and as said general partner of CE Puna Limited Partnership as the
general partner of Puna Geothermal Venture.



/s/ Janet R. Cunningham
Notary Public State of Maryland
My Commission expires:  May 1, 1996
<PAGE>
 
                                                                    ATTACHMENT A
                                                                          TO THE
                                                                 THIRD AMENDMENT


                                   APPENDIX D
                                   ----------

                           POWER PURCHASES BY COMPANY
                           --------------------------
                                (Interim Period)


A.   ENERGY PURCHASES BY THE COMPANY
     -------------------------------

     1.   Subject to the other provisions of this Contract, including but not
          limited to Sections 6 and 7, the Company shall accept and pay for
          Energy generated by the Seller's Facility and delivered under a
          Legally Enforceable Obligation, all on-peak energy above the Legally
          Enforceable Obligation, and all on-peak Emergency Energy (as defined
          in APPENDIX F), by the Seller to the Company at the higher of: (a) the
          respective on-peak and off-peak energy rates set forth in Section A.3.
          of this APPENDIX D, or (b) the Minimum Purchase Rate set forth in
          Section A.4. of this APPENDIX D.  All deliveries of off-peak Energy
          (including off-peak Emergency Energy (as defined in APPENDIX F) under
          which the Seller has no Legally Enforceable Obligation to supply shall
          be paid for at the off-peak energy rates set forth in Section A.3. of
          this APPENDIX D.  The rate of delivery of such Energy may exceed the
          Allowed Capacity as set forth in APPENDIX A at any given time.

     2.   Energy furnished by Seller to the Company shall be metered by a time-
          of-day meter.  The Company shall not pay for any Energy that may be
          delivered by the Seller prior to installation and operation of the
          Company's meters.  The on-peak hours shall be those between 7:00 a.m.
          and 9:00 p.m. daily, and the off-peak hours shall be those between
          9:00 p.m. on one day and 7:00 a.m. on the following day.

     3.   The respective on-peak and off-peak energy rates for Energy shall be
          one hundred percent (100%) of the Company's respective on-peak and
          off-peak Avoided Energy Costs (including avoided costs of fuel and
          operation and maintenance) in cents per kilowatthour, calculated in
          accordance with the provisions of the PUC's Standards, on file with
          the PUC and in effect for the month in which such Energy is delivered,
          as adjusted by the Transformer Loss Adjustment Factor that is to be
          determined pursuant to Paragraph 3(f)(ii) of APPENDIX B.
<PAGE>
 
                                                                    ATTACHMENT A
                                                                          TO THE
                                                                 THIRD AMENDMENT



     4.   The Minimum Purchase Rate in this contract shall apply to all
          deliveries of Energy under a Legally Enforceable Obligation, and all
          on-peak energy above the Legally Enforceable Obligation, made by
          Seller to Company.  The Minimum Purchase Rate shall not apply to
          deliveries of off-peak Energy under which the Seller has no Legally
          Enforceable Obligation to supply to HELCO.

     5.   During each payment period Seller shall be credited at the rate of
          $0.002 per kilovarhour for each kilovarhour furnished by the Seller to
          the Company in excess of .62 x kwh.  The kvarh meters shall be
          adjusted to prevent reversal in the event the power factor is leading.

     6.   [Intentionally Left Blank]

     7.   The Seller shall deliver Energy under Company Dispatch pursuant to a
          Legally Enforceable Obligation as follows:

          a.   On-Peak Period.  During the 14 hour period from 7:00 a.m. to 9:00
               --------------                                                   
               p.m. each day, the Seller shall be obligated to deliver energy
               under the Company's Dispatch at a rate equal to the Seller's firm
               capacity obligation described in Paragraph 3 of APPENDIX B of
               this Contract.

          b.   Off-Peak Period.  During the 10 hour period from midnight to 7:00
               ---------------                                                  
               a.m. and 9:00 p.m. to midnight each day, the Seller shall be
               obligated to deliver energy under the Company's Dispatch at a
               rate not less than the Minimum Delivery Guarantee.

B.   CAPACITY PURCHASES BY THE COMPANY
     ---------------------------------

     1.   As compensation for providing the firm capacity under Company Dispatch
          as described in Paragraph 3 of APPENDIX B, the Company will pay the
          Seller a capacity payment, payable monthly within 20 days after the
          last day of the calendar month in which the firm capacity was
          provided, of 1/12 of the Annual Capacity Payment Rate.

     2.   The Capacity Payment Rate shall be $4,000,000 per year beginning on
          July 1, 1990, or on the Commercial Operation date, whichever occurs
          first; provided that the Seller has satisfied the Acceptance Test

                                       2
<PAGE>
 
                                                                    ATTACHMENT A
                                                                          TO THE
                                                                 THIRD AMENDMENT



          requirement of Paragraph 3(f)(i) of APPENDIX B; and subject to the
          sanction provision of Paragraph D.1. of APPENDIX D.

     3.   The Company shall not be required to pay any additional capacity
          payment for any additional power supplied by the Seller, either at the
          Company's or the Seller's request.

     4.   A failure by the Seller to provide the required firm capacity to the
          Company shall result in the reduction in the capacity payment due to
          the Seller from the Company in accordance with Paragraph D of APPENDIX
          D of this Contract.  The Company shall not have any obligation to pay
          capacity payments to the Seller for periods in excess of twenty-four
          hours in which the Seller is unable to fulfill its obligations under
          the Contract, including but not limited to (i) circumstances which are
          subject to Paragraph 15 of this Contract relating to Force Majeure
          without fault, or (ii) for periods in which the Seller does not
          fulfill its obligations under Paragraph 3 of APPENDIX B of this
          Contract due to the Seller's "default," as such term is defined in
          APPENDIX E of this Contract.

     5.   If the Seller does not satisfy its firm capacity obligations as
          described in Paragraph 3 of APPENDIX B and Paragraph C of this
          APPENDIX D of this Contract, it shall pay sanctions as described in
          Paragraph D of this APPENDIX D.

C.   PERFORMANCE STANDARDS
     ---------------------

     1.   The Seller acknowledges and agrees that the Seller's generating
          facility is expected to meet the following minimum standards for
          satisfactory day-to-day performance during each contract year: (i) an
          On-peak Availability (excluding the four-week annual maintenance
          period and downtime due to a catastrophic equipment failure) of 95
          percent or better; (ii) not more than 6 Plant Trips per year; and
          (iii) a forced outage rate of 5 percent or less.

     2.   The "On-peak Availability" of the Seller's Facility (in percent) is to
          be computed by adding the total Energy Under Company's Dispatch
          Subject to a legally Enforceable Obligation available from the
          Seller's unit during the contract year, multiplying the total by 100,
          and dividing by the product of 4,718 on-peak

                                       3
<PAGE>
 
                                                                    ATTACHMENT A
                                                                          TO THE
                                                                 THIRD AMENDMENT



          hours per 48 week year (4,732 for leap years) times the firm capacity
          obligation (prorated on a daily basis, if necessary).

     3.   "Catastrophic Equipment Failure" means a sudden, unexpected failure of
          a major piece of equipment which (i) substantially reduces or
          eliminates the capability of the Seller's Facility to produce power,
          (ii) is beyond the reasonable control of the Seller and could not have
          been prevented by the exercise of due diligence by the Seller, and
          (iii) despite the exercise of all reasonable efforts, requires more
          than sixty (60) days to repair.

     4.   "Plant Trip" means the sudden and immediate removal of the Seller's
          Facility from service as a result of an immediate mechanical/
          electrical/hydraulic control system trip or operator initiated
          trip/shutdown which requires the Company to take immediate steps to
          place an unscheduled generator on line to make up for the loss of
          output of the Seller's Facility; provided, however, that a Plant Trip
          shall not include: (i) any such removal which occurs within forty-
          eight (48) hours of the time at which the Seller's Facility is
          restarted following an outage; (ii) trips caused or initiated by the
          Company; or (iii) trips occurring during periods when the Seller has
          continued to furnish capacity to the Company at the request of the
          Company's Production Manager after the Seller has notified the
          Company's Production Manager that the Seller's Facility is likely to
          trip.

     5.   The "Forced Outage Rate" of the Seller's Facility during a contract
          year is to be computed by totaling the average megawatts unavailable
          for service due to forced outages or deratings on an hourly basis,
          multiplying the total by 100, and dividing by the product of 8,760
          hours per year times the weighted average of the Seller's firm
          capacity obligation (prorated on a daily basis, if necessary).

D.   SANCTIONS
     ---------

     1.   The capacity payment is to be made on the basis of the full
          availability of the Seller's firm capacity obligation.  When the
          Seller's full firm capacity obligation is not available, the Seller
          shall pay the Company $0.0339 per on-peak hour for each kilowatt of
          deficiency based on annual capacity payments of $4 million and 4,718
          on-peak hours in a year.  During

                                       4
<PAGE>
 
                                                                    ATTACHMENT A
                                                                          TO THE
                                                                 THIRD AMENDMENT



          the period from July 1, 1990 to December 31, 1990, the sanction
          provided for in this paragraph shall not exceed the capacity payments
          provided for in Section B.2. of this APPENDIX D on a monthly basis.

     2.   For each contract year in which the On-peak Availability of the
          Seller's Facility is less than 95 percent, the Seller will pay $10,000
          to the Company for each full percentage point of the shortfall unless
          the shortfall is due to a catastrophic equipment failure.

     3.   For each Plant Trip in excess of 6 per contract year, the Seller shall
          pay $10,000 to the Company.

     4.   The Company shall have the right to offset any payment due from the
          Seller under this Paragraph against any payments due to the Seller.

     5.   If the Seller does not deliver 12,500 kw of Firm Capacity as provided
          by Paragraph 3 of APPENDIX B, by December 31, 1990, the Seller shall
          pay the Company $0.0339 per on-peak hour for each kilowatt deficiency
          until the Seller satisfies the Acceptance Test provided in Paragraph
          3(f)(i) for 12,500 kw of Firm Capacity; if the Seller does not deliver
          25,000 kw of Firm Capacity as provided by Paragraph 3 of APPENDIX B,
          by March 1, 1991, the Seller shall pay the Company $0.0339 per on-peak
          hour for each kilowatt deficiency until the Seller satisfies the
          Acceptance Test provided in Paragraph 3(f)(i) for 25,000 kw of Firm
          Capacity.

     6.   Each party may exercise whatever legal or equitable remedies may be
          available to enforce the obligations of this Contract in the event of
          a default by the other party.

                                       5
<PAGE>
 
                                                                    ATTACHMENT B
                                                                          TO THE
                                                                 THIRD AMENDMENT



                                   APPENDIX D

                           POWER PURCHASES BY COMPANY
                         (Subsequent to Interim Period)


A.   ENERGY PURCHASES BY THE COMPANY
     -------------------------------

     1.   Subject to the other provisions of this Contract, including but not
          limited to Sections 6 and 7, the Company shall accept and pay for
          Energy generated by the Seller's Facility and delivered by the Seller
          to the Company at the higher of: (a) the respective on-peak and off-
          peak energy rates set forth in Section A.3. of this APPENDIX D, or (b)
          the Minimum Purchase Rate set forth in Section A.4. of this APPENDIX
          D; provided, however, that the rate of delivery of such Energy shall
          not exceed the Allowed Capacity as set forth in APPENDIX A at any
          given time.

     2.   Energy furnished by Seller to the Company shall be metered by a time-
          of-day meter.  The Company shall not pay for any Energy that may be
          delivered by the Seller prior to installation and operation of the
          Company's meters.  The on-peak hours shall be those between 7:00 a.m.
          and 9:00 p.m. daily, and the off-peak hours shall be those between
          9:00 p.m. on one day and 7:00 a.m. on the following day.

     3.   The respective on-peak and off-peak energy rates for Energy shall be
          one hundred percent (100%) of the Company's respective on-peak and
          off-peak Avoided Energy Costs (including avoided costs of fuel and
          operation and maintenance) in cents per kilowatthour, calculated in
          accordance with the provisions of the PUC's Standards, on file with
          the PUC and in effect for the month in which such Energy is delivered,
          as adjusted by the Transformer Loss Adjustment Factor that is to be
          determined pursuant to Paragraph 3(f)(ii) of APPENDIX B.

     4.   The Minimum Purchase Rate in this contract shall apply to all
          deliveries of Energy made by Seller to Company during the term of this
          Contract and to all deliveries of Energy under a Legally Enforceable
          Obligation made by Seller to Company.

     5.   During each payment period Seller shall be credited at the rate of
          $0.002 per kilovarhour for each kilovarhour furnished by the Seller to
          the Company in
<PAGE>
 
                                                                    ATTACHMENT B
                                                                          TO THE
                                                                 THIRD AMENDMENT



          excess of .62 x kwh.  The kvarh meters shall be adjusted to prevent
          reversal in the event the power factor is leading.

     6.   Company shall accept and pay for Emergency Energy (as defined in
          APPENDIX F) generated by Seller's Facility and made available by
          Seller to Company, as follows: the respective on-peak and off-peak
          energy rates for Emergency Energy shall be three hundred percent
          (300%) of Company's on-peak and off-peak Avoided Energy Costs
          (including avoided costs of fuel and operation and maintenance) in
          cents per kilowatthour, calculated in accordance with the provisions
          of the PUC's Standards, on file with the PUC and in effect for the
          quarter in which such Energy is delivered.

     7.   The Seller shall deliver Energy under Company Dispatch pursuant to a
          Legally Enforceable Obligation as follows:

          a.   On-Peak Period.  During the 14 hour period from 7:00 a.m. to 9:00
               --------------                                                   
               p.m. each day, the Seller shall be obligated to deliver energy
               under the Company's Dispatch at a rate equal to the Seller's firm
               capacity obligation described in Paragraph 3 of APPENDIX B of
               this Contract.

          b.   Off-Peak Period.  During the 10 hour period from midnight to 7:00
               ---------------                                                  
               a.m. and 9:00 p.m. to midnight each day, the Seller shall be
               obligated to deliver energy under the Company's Dispatch at a
               rate not greater than the Seller's firm capacity obligation
               described in Paragraph 3 of APPENDIX B of this Contract and not
               less than the Minimum Delivery Guarantee.

B.   CAPACITY PURCHASES BY THE COMPANY
     ---------------------------------

     1.   As compensation for providing the firm capacity under Company Dispatch
          as described in Paragraph 3 of APPENDIX B, the Company will pay the
          Seller a capacity payment, payable monthly within 20 days after the
          last day of the calendar month in which the firm capacity was
          provided, of 1/12 of the Annual Capacity Payment Rate.

     2.   The Capacity Payment Rate shall be $4,000,000 per year beginning on
          July 1, 1990, or on the Commercial Operation date, whichever occurs
          first; provided that the Seller has satisfied the Acceptance Test

                                       2
<PAGE>
 
                                                                    ATTACHMENT B
                                                                          TO THE
                                                                 THIRD AMENDMENT



          requirement of Paragraph 3(f)(i) of APPENDIX B; and subject to the
          sanction provision of Paragraph D.l. of APPENDIX D.

     3.   The Company shall not be required to pay any additional capacity
          payment for any additional power supplied by the Seller, either at the
          Company's or the Seller's request.

     4.   A failure by the Seller to provide the required firm capacity to the
          Company shall result in the reduction in the capacity payment due to
          the Seller from the Company in accordance with Paragraph D of APPENDIX
          D of this Contract.  The Company shall not have any obligation to pay
          capacity payments to the Seller for periods in excess of twenty-four
          hours in which the Seller is unable to fulfill its obligations under
          the Contract, including but not limited to (i) circumstances which are
          subject to Paragraph 15 of this Contract relating to Force Majeure
          without fault, or (ii) for periods in which the Seller does not
          fulfill its obligations under Paragraph 3 of APPENDIX B of this
          Contract due to the Seller's "default," as such term is defined in
          APPENDIX E of this Contract.

     5.   If the Seller does not satisfy its firm capacity obligations as
          described in Paragraph 3 of APPENDIX B and Paragraph C of this
          APPENDIX D of this Contract, it shall pay sanctions as described in
          Paragraph D of this APPENDIX D.

C.   PERFORMANCE STANDARDS
     ---------------------

     1.   The Seller acknowledges and agrees that the Seller's generating
          facility is expected to meet the following minimum standards for
          satisfactory day-to-day performance during each contract year: (i) an
          On-peak Availability (excluding the four-week annual maintenance
          period and downtime due to a catastrophic equipment failure) of 95
          percent or better; (ii) not more than 6 Plant Trips per year; and
          (iii) a forced outage rate of 5 percent or less.

     2.   The "On-peak Availability" of the Seller's Facility (in percent) is to
          be computed by adding the total Energy Under Company's Dispatch
          Subject to a legally Enforceable Obligation available from the
          Seller's unit during the contract year, multiplying the total by 100,
          and dividing by the product of 4,718 on-peak

                                       3
<PAGE>
 
                                                                    ATTACHMENT B
                                                                          TO THE
                                                                 THIRD AMENDMENT



          hours per 48 week year (4,732 for leap years) times the firm capacity
          obligation (prorated on a daily basis, if necessary).

     3.   "Catastrophic Equipment Failure" means a sudden, unexpected failure of
          a major piece of equipment which (i) substantially reduces or
          eliminates the capability of the Seller's Facility to produce power,
          (ii) is beyond the reasonable control of the Seller and could not have
          been prevented by the exercise of due diligence by the Seller, and
          (iii) despite the exercise of all reasonable efforts, requires more
          than sixty (60) days to repair.

     4.   "Plant Trip" means the sudden and immediate removal of the Seller's
          Facility from service as a result of an immediate mechanical/
          electrical/hydraulic control system trip or operator initiated
          trip/shutdown which requires the Company to take immediate steps to
          place an unscheduled generator on line to make up for the loss of
          output of the Seller's Facility; provided, however, that a Plant Trip
          shall not include: (i) any such removal which occurs within forty-
          eight (48) hours of the time at which the Seller's Facility is
          restarted following an outage; (ii) trips caused or initiated by the
          Company; or (iii) trips occurring during periods when the Seller has
          continued to furnish capacity to the Company at the request of the
          Company's Production Manager after the Seller has notified the
          Company's Production Manager that the Seller's Facility is likely to
          trip.

     5.   The "Forced Outage Rate" of the Seller's Facility during a contract
          year is to be computed by totaling the average megawatts unavailable
          for service due to forced outages or deratings on an hourly basis,
          multiplying the total by 100, and dividing by the product of 8,760
          hours per year times the weighted average of the Seller's firm
          capacity obligation (prorated on a daily basis, if necessary).

D.   SANCTIONS
     ---------

     1.   The capacity payment is to be made on the basis of the full
          availability of the Seller's firm capacity obligation.  When the
          Seller's full firm capacity obligation is not available, the Seller
          shall pay the Company $0.0339 per on-peak hour for each kilowatt of
          deficiency based on annual capacity payments of $4 million and 4,718
          on-peak hours in a year.  During the period from July 1, 1990 to
          December 31, 1990,

                                       4
<PAGE>
 
                                                                    ATTACHMENT B
                                                                          TO THE
                                                                 THIRD AMENDMENT



          the sanction provided for in this paragraph shall not exceed the
          capacity payments provided for in Section B.2. of this APPENDIX D on a
          monthly basis.

     2.   For each contract year in which the On-peak Availability of the
          Seller's Facility is less than 95 percent, the Seller will pay $10,000
          to the Company for each full percentage point of the shortfall unless
          the shortfall is due to a catastrophic equipment failure.

     3.   For each Plant Trip in excess of 6 per contract year, the Seller shall
          pay $10,000 to the Company.

     4.   The Company shall have the right to offset any payment due from the
          Seller under this Paragraph against any payments due to the Seller.

     5.   If the Seller does not deliver 12,500 kw of Firm Capacity as provided
          by Paragraph 3 of APPENDIX B, by December 31, 1990, the Seller shall
          pay the Company $0.0339 per on-peak hour for each kilowatt deficiency
          until the Seller satisfies the Acceptance Test provided in Paragraph
          3(f)(i) for 12,500 kw of Firm Capacity; if the Seller does not deliver
          25,000 kw of Firm Capacity as provided by Paragraph 3 of APPENDIX B,
          by March 1, 1991, the Seller shall pay the Company $0.0339 per on-peak
          hour for each kilowatt deficiency until the Seller satisfies the
          Acceptance Test provided in Paragraph 3(f)(i) for 25,000 kw of Firm
          Capacity.

     6.   Each party may exercise whatever legal or equitable remedies may be
          available to enforce the obligations of this Contract in the event of
          a default by the other party.

                                       5

<PAGE>
 
                                                            HECO Exhibit 10.6(b)
                                                            --------------------


                                                          CONTRACT NO: C06931(B)


              Amendment No. 2 to "Purchase Power Contract Between
          Hawaiian Electric Co., Inc. and City and County of Honolulu
                             Dated March 10, 1986"


By mutual agreement, sections 2(c) and 2(d) of the subject Contract are replaced
by sections 2(c), 2(d), 2(e), and 2(f) of this Amendment No. 2 to reflect a
modification of the deadlines for billing and payment for energy and capacity
received by Hawaiian Electric Company.

(c)   By the fifth working day (i.e. excluding Saturdays, Sundays and legal
      holidays of either the federal government or the Hawaii state government)
      of each calendar month, the Company shall provide the Seller or its
      designated agent with the appropriate data for the Seller to compute the
      energy charge for electricity delivered to the Company in the preceding
      calendar month as determined in accordance with this Contract.

(d)   By the tenth working day of each calendar month, the Seller shall submit
      to the Company an invoice that contains (1) an energy charge for energy
      purchased by the Company in the preceding month; (2) a capacity charge for
      the available capacity in the preceding month; and (3) the metering charge
      as set forth in Section 5 of this Contract.  Each invoice shall include
      the Seller's backup data for the computation of the capacity charge.

(e)   By the twentieth working day of each calendar month (but no later than the
      last working day of that month if there are less than twenty working days
      in that month), the Company shall make payment on such invoice, or provide
      to the Seller an itemized statement of its objections to all or any
      portion of such invoice and pay any undisputed amount.

(f)   Notwithstanding all or any portion of such invoice in dispute, any payment
      not made to the Seller after the twentieth working day of each calendar
      month (or the last working day of that month if there are less than twenty
      working days in that month), shall accrue interest at the maximum rate
      allowed by law until the outstanding interest and invoiced amounts are
      paid in full.  Partial payments shall be applied first to outstanding but
      unpaid interest and then to outstanding but unpaid invoice amounts.

This Amendment shall become effective on the Effective Date of the Firm Capacity
Amendment to Purchase Power Contract Dated March 10, 1986, dated April 8, 1991.

                                      -1-
<PAGE>
 
This Amendment covers billing and payment dates only and is in no way intended
to affect the pricing mechanisms established in the Contract.


HAWAIIAN ELECTRIC COMPANY, INC. ("Company")


By   /s/ Edward Y. Hirata        4/28/92
  --------------------------    ---------
 Its Vice President        Date



By   /s/ George T. Iwahiro       4-28-92
  --------------------------    ---------
 Its Vice President        Date



CITY AND COUNTY OF HONOLULU ("Seller")



By   /s/ Glen S. Nonaka          JUN 04 1992
  ---------------------------    -----------
 For Its Director of Finance    Date



By   /s/ C. Michael Street       MAY 27 1992
  ---------------------------    -----------
 Its Director-Chief Engineer,    Date
 Department of Public Works

                                      -2-

<PAGE>
 
                                                            HECO Exhibit 10.7
                                                            -----------------





                            POWER PURCHASE AGREEMENT

                                    between

                              ENCOGEN HAWAII, L.P.

                                      and


                      HAWAII ELECTRIC LIGHT COMPANY, INC.

 
<PAGE>
 
                               TABLE OF CONTENTS



<TABLE>
<S>                                                                                     <C>
I.  ARTICLE I - DEFINITIONS..........................................................          2
                                                                                                
II.  ARTICLE II - SCOPE OF AGREEMENT.................................................         13
                                                                                                
     2.1  General Description........................................................         13
          A.  Basic Concept..........................................................         13
          B.  Facility Specifications................................................         13
          C.  Site...................................................................         14
          D.  Electric Specifications................................................         14
          E.  Fuel and Other Expendables.............................................         14
     2.2  Effective Date/Regulatory Approval.........................................         14
          A.  Effective Date of Agreement............................................         14
          B.  Effect of Delay or Denial of PUC Approval..............................         14
          C.  Effect of Delay in Obtaining Non-Appealable PUC                                   
               Approval Order........................................................         15
          D.  Effect of Partial Approval of Payments Terms...........................         15
          E.  Conditional PUC Approval...............................................         16
          F.  PUC Approval Date......................................................         16
          G.  Effect of Reconsideration or Appeal of PUC Approval Order..............         17
          H.  Obligations of Parties Upon Termination................................         18
     2.3  Conditions Precedent.......................................................         19
          A.  HELCO Conditions Precedent.............................................         19
               (1)  Following the Execution Date.....................................         19
               (2)  On or Before Closing Date........................................         19
               (3)  On or Before Phase 1 In-Service Date.............................         19
               (4)  On or Before Phase 2 In-Service Date.............................         20
          B.  Failure of HELCO Conditions Precedent..................................         20
               (1)  Right to Declare an Event of Default.............................         20
               (2)  SELLER's Declaration Requirements................................         20
               (3)  HELCO's Declaration Requirements.................................         21
     2.4  Failure to Meet Milestone Dates............................................         21
          A.  Right to Declare Event of Default......................................         21
               (1)  Failure to Achieve Milestones....................................         21
               (2)  Dispute Over HELCO'S Determination...............................         22
          B.  Late Charges...........................................................         22
          C.  Arbitration............................................................         23
               (1)  Time of the Essence..............................................         23
               (2)  Designation of Arbitrator........................................         23
               (3)  Timing of Arbitrator's Decision..................................         24
               (4)  Standard to be Applied...........................................         24
               (5)  Effect of Arbitrator's Decisions.................................         24
               (6)  Cost of Arbitration..............................................         24
     2.5  No Waiver..................................................................         24   
</TABLE>  
                                       i
<PAGE>
 
<TABLE>
<S>                                                                                     <C>
     2.6  Term.......................................................................         24
          A.  Extension of Term......................................................         25
          B.  Post Term..............................................................         25
     2.7  SELLER Financing...........................................................         25
                                                                                               
III. ARTICLE III - SPECIFIC RIGHTS AND OBLIGATIONS                                            
     OF THE PARTIES..................................................................         26

     3.1  Rights and Obligations of Both Parties.....................................         26
          A.  Sale and Purchase of Power.............................................         26
          B.  Protection of Facilities...............................................         26
          C.  Good Engineering and Operating Practices...............................         26
          D.  Interconnection Facilities.............................................         26
          E.  Security Documents.....................................................         26
     3.2  Rights and Obligations of SELLER...........................................         27
          A.  Design and Construction of Facility....................................         27
               (1)  General..........................................................         27
               (2)  Milestone Dates..................................................         27
               (3)  In-Service Date Deadlines........................................         28
               (4)  Permits and Licenses.............................................         28
               (5)  Review of Facilities.............................................         28
               (6)  Facility Protection Equipment....................................         29
               (7)  Progress Reports.................................................         30
          B.  Operation and Maintenance of Facility..................................         30
               (1)  Standards........................................................         30
               (2)  Functioning Protective Equipment.................................         31
               (3)  Personnel and System Safety......................................         31
               (4)  Operating Records................................................         32
               (5)  Maintenance Records..............................................         32 
               (6)  Major Outages....................................................         33
          C.  Delivery of Power to HELCO; Dispatch Constraints.......................         33
               (1)  Delivery Voltage Standards.......................................         33
               (2)  Frequency Standards..............................................         33
               (3)  Reactive kVAR Standards..........................................         33
               (4)  Generator H Constant.............................................         34
               (5)  Entire Output Delivered..........................................         34
               (6)  Interconnection..................................................         34
               (7)  Operation of Synchronizing Breakers..............................         34
               (8)  Schedule of Outages..............................................         35
               (9)  Minimum Load Capability..........................................         35
               (10)  Short Circuit Ratio.............................................         35
               (11)  Open Circuit Transient Field Time Constant......................         35
               (12)  Generator Step-Up Transformer Impedance.........................         35
               (13)  Response Ratio..................................................         35
               (14)  Ceiling Voltage.................................................         35
</TABLE> 
                                      ii
<PAGE>
 
<TABLE>
<S>                                                                                     <C>
               (15)  Excitation Source Immunity......................................         35 
               (16)  Static Regulator................................................         35
               (17)  Field Forcing Ability...........................................         35
               (18)  Droop Characteristic............................................         35
               (19)  Over/Under-Speed................................................         35
               (20)  Control Systems.................................................         35
               (21)  Regulation Capability...........................................         36
               (22)  Capacity Tests..................................................         36
               (23)  Cycling of the Heat Recovery Steam Generators                            36
                     and the Steam Turbine...........................................          
               (24)  Startup Periods.................................................         36
               (25)  Ramp Rates......................................................         36
               (26)  QLPU............................................................         36
               (27)  Simple Cycle Operation..........................................         36
          D.  Warranties and Guarantees of Performance...............................         38
               (1)  Equivalent Availability Factor...................................         38
               (2)  Equivalent Forced Outage Rate....................................         38
               (3)  Firm Capacity....................................................         39
               (4)  Quality..........................................................         39
               (5)  Unit Trips.......................................................         39
               (6)  Exclusive Warranties.............................................         39
          E.  Metering...............................................................         39
               (1)  Meters...........................................................         39
               (2)  Communications, Telemetering and Remote                                    
                    Control Equipment................................................         40
               (3)  Meter Testing....................................................         40
               (4)  Corrections......................................................         40
          F.  Fuel and Other Materials...............................................         40
          G.  Waste Handling.........................................................         41
          H.  Emissions..............................................................         41
          I.  Compliance with Laws...................................................         41
          J.  Adequate Spare Parts...................................................         41
          K.  Periodic Meetings......................................................         41
          L.  Maintenance of Qualifying Facility (QF) Status.........................         42
          M.  Notice of Certain Events...............................................         42
          N.  Labor Disputes.........................................................         43
     3.3  Rights and Obligations of HELCO............................................         43
          A.  Dispatch of Facility Power.............................................         43
               (1)  Routine Dispatch.................................................         43
               (2)  Demonstration of Loading and Unloading Ramp Rates................         44
               (3)  Dispatch Notices.................................................         45
          B.  HELCO Right to Buyout..................................................         45
               (1)  General..........................................................         45
               (2)  Ownership of Unsalvageable Items.................................         46
          C.  HELCO Right to Defer...................................................         46
</TABLE>
                                      iii
<PAGE>
 
<TABLE>
<S>                                                                                     <C>
               (1)  Prior to the PUC Approval Date...................................      46   
               (2)  Prior to the Closing Date........................................      47  
               (3)  On or After the Closing Date and Prior to Phase I                      48  
                    In-Service Date..................................................          
               (4)  Adjustments to Times.............................................      48  
               (5)  Benefits to Others...............................................      49  
               (6)  No Material Adverse Impact.......................................      49  
               (7)  Impact on PSD Permit.............................................      49  
               (8)  Changed Circumstances............................................      49  
          D.   HELCO Right to Require Independent Engineering                                   
               Assessment............................................................      50  
               (1)  Implementation of Independent Engineering                                  
                    Assessment.......................................................      50  
               (2)  Qualified Independent Engineers List.............................      51  
                                                                                                
IV.  ARTICLE IV - SUSPENSION OR REDUCTION OF DELIVERIES..............................      51  
                                                                                                
     4.1  Initiation by HELCO........................................................      51  
          A.  Facility Problems......................................................      52  
          B.  HELCO System Problem...................................................      52  
     4.2  No Obligation to Accept Energy.............................................      52  
     4.3  Initiation by SELLER.......................................................      53  

V.  ARTICLE V - RATES FOR PURCHASE...................................................      53  
                                                                                                
     5.1  Capacity and Energy Purchased by HELCO.....................................      53  
          A.  Energy Charge..........................................................      53  
          B.  Capacity Charge........................................................      58  
              (1)  Calculation of the Monthly Capacity Charge........................      58  
              (2)  Acceptance Tests..................................................      59  
              (3)  Capacity Shortfall; Corrective Period.............................      59  
          C.  Hawaii General Excise Tax..............................................      60  
          D.  No Payment of Emission Fees............................................      60  
          E.  No Payment of Other Taxes or Fees......................................      60  

VI.  ARTICLE VI - BILLING AND PAYMENT................................................      60  
                                                                                                
     6.1  Monthly Invoice............................................................      60  
     6.2  Payment......................................................................    61  
     6.3  Adjustments................................................................      61  
     6.4  Other Payments.............................................................      61   
</TABLE>
                                      iv
<PAGE>
 
<TABLE>
<S>                                                                                     <C>
VII.  ARTICLE VII - DEFAULT..........................................................      61   
                                                                                                
     7.1  Events of Default..........................................................      61  
          A.  Default by SELLER......................................................      61  
          B.  Default by HELCO.......................................................      65  
          C.  Right to Cure Default..................................................      66  
     7.2  Rights and Obligations of the Parties Upon Default.........................      66  
          A.  Notice of Default......................................................      66  
          B.  Right to Terminate.....................................................      66  
          C.  Right to Demand Independent Engineering Assessment                                
              and Modification.......................................................      67  
          D.  Other Rights Upon Default..............................................      68  
                                                                                               
VIII.  ARTICLE VIII - LIQUIDATED DAMAGES FOR FAILURE TO                                        
       ATTAIN WARRANTED PERFORMANCE; BONUSES.........................................      68  
                                                                                                
     8.1  Liquidated Damages.........................................................      68  
          A.  Equivalent Availability Factor.........................................      68  
          B.  Equivalent Forced Outage Rate..........................................      69  
          C.  Ramp Derating Penalty..................................................      69  
          D.  Excessive Unit Trips...................................................      70  
     8.2  Payment of Liquidated Damages..............................................      70  
     8.3  Maintenance Account........................................................      70  
     8.4  Adjustments................................................................      71  
                                                                                               
IX.  ARTICLE IX - HELCO'S INSPECTION OF FACILITY OPERATION                                     
     AND USE OF FACILITY SITE; OPTION FOR SITE REPRESENTATIVE........................      71
                                                                                                
     9.1  Inspection of Facility Operation...........................................      71  
     9.2  Entry For Work On Site.....................................................      72  
     9.3  Provision of Site Space....................................................      72  
     9.4  No Ownership Interest......................................................      72  
     9.5  HELCO Site Representative Option...........................................      72  
                                                                                                
X.  ARTICLE X - AUDIT RIGHTS.........................................................      73  
                                                                                                
     10.1  Rights of HELCO...........................................................      73  
     10.2  Rights of SELLER..........................................................      73  

XI.  ARTICLE XI - INDEMNIFICATION....................................................      73  
                                                                                                
     11.1  Indemnification of HELCO..................................................      73  
     11.2  Indemnification of SELLER.................................................      75  
                                                                                                
XII.  ARTICLE XII - CONSEQUENTIAL DAMAGES............................................      76   
</TABLE>
                                       v
<PAGE>
 
<TABLE>
<S>                                                                                     <C>
XIII. ARTICLE XIII - INSURANCE.......................................................         76 
                                                                                               
     13.1  Required Coverage.........................................................         76
     13.2  Additional Insureds.......................................................         76
     13.3  Evidence of Policies Provided to HELCO....................................         76
     13.4  Deductibles...............................................................         76
                                                                                               
XIV.  ARTICLE XIV - DISPUTE RESOLUTION...............................................         77
                                                                                               
     14.1  Good Faith Negotiations...................................................         77
     14.2  Dispute Resolution Procedures.............................................         77
           A.  Initiation of Arbitration.............................................         77
           B.  Appointment of Arbitrator.............................................         77
           C.  Arbitration Procedures................................................         78
           D.  Arbitrator Limitations................................................         79
           E.  Decision Binding on the Parties.......................................         79
           F.  Cost of Arbitration...................................................         79
                                                                                               
XV.  ARTICLE XV - FORCE MAJEURE......................................................         79
                                                                                               
     15.1  Definition................................................................         79
     15.2  Notice of Force Majeure...................................................         80
     15.3  Excuse of Obligation; Extension of Milestone Dates and In-Service                  80
           Date Deadlines............................................................         80
     15.4  Right To Terminate Due To Force Majeure or Catastrophic                             
           Equipment Failure.........................................................         81
     15.5  Obligations Remaining After Event of Force Majeure........................         81
     15.6  Extension of Term.........................................................         81

XVI.  ARTICLE XVI - ELECTRIC SERVICE SUPPLIED BY HELCO...............................         81
                                                                                               
XVII.  ARTICLE XVII - ASSIGNMENT.....................................................         81
                                                                                               
     17.1  Assignment by SELLER......................................................         81
     17.2  Assignment by HELCO.......................................................         82
     17.3  Binding on Assigns........................................................         82

XVIII. ARTICLE XVIII - CHANGE IN COMMITTED CAPACITY OF FACILITY......................         82
                                                                                               
XIX.  ARTICLE XIX - SALE OF FACILITY BY SELLER.......................................         82
                                                                                               
     19.1  HELCO's Right of First Refusal............................................         82
     19.2  No Exercise of Right by HELCO.............................................         83  
</TABLE>
                                      vi
<PAGE>
 
<TABLE>
<S>                                                                                     <C>
XX.  ARTICLE XX - ESCROW ACCOUNT..........................................................    83

XXI.  ARTICLE XXI - GUARANTEE.............................................................    83
     21.1   Guarantee(s)..................................................................    83
     21.2   Guaranteed Amount.............................................................    84

XXII.  ARTICLE XXII - REIMBURSEMENT OF CERTAIN HELCO
       ADMINISTRATIVE COSTS...............................................................    84

XXIII.  ARTICLE XXIII - MISCELLANEOUS.....................................................    85

     23.1   Recovery of Payments..........................................................    85
     23.2   Notices.......................................................................    85
     23.3   Entire Agreement..............................................................    86
     23.4   Further Assurances............................................................    86
     23.5   Severability..................................................................    86
     23.6   No Waiver.....................................................................    86
     23.7   Modification or Amendment.....................................................    87
     23.8   Governing Law and Interpretation..............................................    87
     23.9   Counterparts..................................................................    87
     23.10  Computation of Time...........................................................    87
     23.11  Thermal Energy Sales Contract.................................................    87
     23.12  Review of Financing Documents; Project Financing..............................    87
     23.13  Confidential and Proprietary Information......................................    88
     23.14  PUC Approval..................................................................    88
     23.15  Change in Standard System or Organization.....................................    89
            A.  Consistent with Original Intent...........................................    89
            B.  Eliminated or Inconsistent with Original Intent...........................    89
     23.16  No Party Deemed Drafter.......................................................    90
     23.17  Headings......................................................................    90

Attachment A.  Diagram of Interconnection.................................................   A-1
Attachment B.  Milestone Events
Attachment C.  Selected Portions of NERC GADS.............................................   C-1
Attachment D.  Facility Functional Description............................................   D-1
Attachment E.  Form of Interconnection Agreement..........................................   E-1
Attachment F.  Facility Location and Layout...............................................   F-1
Attachment G.  Form of Maintenance Summary Report.........................................   G-1
Attachment H.  Qualified Independent Engineers List.......................................   H-1
Attachment I.  Adjustment of Charges......................................................   I-1
Attachment J.  Required Insurance.........................................................   J-1
Attachment K.  Calculation of Ramp Derating Penalty.......................................   K-1
Attachment L.  Capacity Testing Procedures................................................   L-1
Attachment M.  Unit Incident Report.......................................................   M-1
Attachment N.  Intentionally Omitted......................................................   N-1
</TABLE>
                                      vii
<PAGE>
 
<TABLE>
<S>                                                                                         <C>
Attachment O.  Design Materials........................................................      O-1
Attachment P.  Sample Energy Payment Calculation.......................................      P-1
Attachment Q.  SELLER's Permits........................................................      Q-1
Attachment R.  Intentionally Omitted...................................................      R-1
Attachment S.  HELCO's Schedule "J" Tariff.............................................      S-1
Attachment T.  Form of Guarantee.......................................................      T-1
</TABLE>
                                     viii
<PAGE>
 
                            POWER PURCHASE AGREEMENT

                                    between
                              ENCOGEN HAWAII, L.P.
                                      and
                      HAWAII ELECTRIC LIGHT COMPANY, INC.


     THIS AGREEMENT ("Agreement") is made as of this 22nd day of October, 1997
("Execution Date"), by and between HAWAII ELECTRIC LIGHT COMPANY, INC.
("HELCO"), a Hawaii corporation, with principal offices in Hilo, Hawaii, and
ENCOGEN HAWAII, L.P. ("SELLER"), a Delaware limited partnership, with principal
offices in Dallas, Texas, doing business in Hawaii.


                             W I T N E S S E T H :


     WHEREAS, HELCO is a regulated public utility engaged in the business of
generation, purchase, transmission and distribution of electric power to
customers on the Island of Hawaii, Hawaii; and

     WHEREAS, pursuant to the terms and conditions set forth herein, HELCO
desires to purchase electric power from SELLER and dispatch such electric power;
and

     WHEREAS, SELLER is organized for the purpose of designing, constructing,
owning, operating and maintaining a sixty megawatt (60 MW) (net) cogeneration
facility on property leased or purchased by SELLER at Haina, Hawaii; and

     WHEREAS, SELLER intends to operate such facility as a Qualifying Facility
as defined in PURPA, 18 Code of Federal Regulations ("CFR") Part 292, and Title
6, Chapter 74 of the Hawaii Administrative Rules; and

     WHEREAS, HELCO's willingness to enter into this Agreement and to purchase
electricity at the rate set forth in this Agreement is based upon the
expectation that HELCO will recover capacity and energy payments made to SELLER
through electric rates paid by its customers and adjusted to reflect changing
purchased energy costs by means of a periodic rate adjustment mechanism such as
the Energy Cost Adjustment Clause authorized by the Hawaii Public Utilities
Commission ("PUC"); and

     WHEREAS, HELCO's willingness to enter into this Agreement is based on
SELLER's assurances that SELLER can and will perform all of its obligations
hereunder in a manner that will ensure no degradation in the quality of service
provided HELCO's customers because of SELLER's construction, ownership,
operation, and maintenance of the Facility or in any other manner.

                                       1
<PAGE>
 
     NOW THEREFORE, in consideration of these premises and of the mutual
promises contained herein, the parties hereto agree that the following terms and
conditions shall govern the sale and transfer of electricity by SELLER and the
purchase and acceptance of such electricity by HELCO and other related
transactions:

                            ARTICLE I - DEFINITIONS

     For the purposes of this Agreement, the following terms shall have the
meanings as indicated below:

     Allowance for Funds Used During Construction (AFUDC) - The capital carrying
costs incurred by HELCO during the development and construction of a capital
project which are capitalized as a cost of plant on the books of HELCO in
accordance with methods approved by the PUC.

     Allowed Simple Cycle Period - Shall have the meaning set forth in
Section 3.2C(27).

     American National Standards Institute Code for Electricity Metering - The
publication of the American National Standards Institute which establishes
acceptable performance criteria for new types of watt hour meters, demand
meters, demand registers, instrument transformers and auxiliary devices.  It
states acceptable in-service performance levels for meters and devices used in
revenue metering.  It also includes information on related subjects, such as
recommended measurement standards, installation requirements and test schedules.

     Annual Dispatch Notice - The notice provided by HELCO to SELLER each
calendar year in accordance with Section 3.3A(3), which shows the amount of
capacity and energy HELCO expects the Facility to produce on an hourly basis for
the following calendar year.

     Audit Period - Shall have the meaning in Section 3.3B(1).

     Billing Period - For any computation of Capacity Charge or Energy Charge
payments, the immediately preceding Calendar Month.

     Business Day - Any day other than a Saturday, Sunday or legal holiday of
either the United States or the State of Hawaii.

     Buyout Payment - Shall have the meaning in Section 3.3B(1).

     Calendar Month - The period commencing at 12:01 a.m. on the first day of
any month and terminating at midnight on the last day of the same month.

     Capacity Charge - The amount to be paid by HELCO to SELLER pursuant to
Section 5.1B of this Agreement.

     Capacity Rate - The rate by which Capacity Charge is calculated pursuant to
Section 5.1B of this Agreement.

                                       2
<PAGE>
 
     Capacity Test - The Initial Acceptance Test performed by SELLER in
accordance with Section 3.2C(22) prior to the Phase 1 In-Service Date and the
Phase 2 In-Service Date, as the case may be, to determine Firm Capacity, or a
subsequent Capacity Test.

     Catastrophic Equipment Failure - Either (A) a sudden unexpected failure of
a major piece of equipment which (1) substantially reduces or eliminates the
capability of the Facility to produce power, (2) is beyond the reasonable
control of SELLER and could not have been prevented by the exercise of
reasonable due diligence by SELLER, and (3) despite the exercise of all
reasonable efforts, actually requires more than 60 days to repair (if the
determination of whether a Catastrophic Equipment Failure has occurred is being
made more than 60 days after the failure) or is reasonably expected to require
more than 60 days to repair (if such determination is being made within 60 days
after the failure); or (B) a sudden, unexpected failure of a combustion turbine
blade or a steam turbine blade which requires opening a gas turbine (or
compressor) or steam turbine casing to repair and which meets the criteria in
both (A)(1) and (A)(2) above.

     Closing Date - The date on which the closing of long-term, non-recourse
construction and term financing of the Facility under the Financing Documents
occurs.

     Committed Capacity - During the Phase 1 Period, twenty-two thousand
kilowatts (22,000 kW) of reliable electrical capacity which SELLER agrees herein
to make available to HELCO from the Facility at the Metering Point under HELCO
Dispatch.  During the Phase 2 Period, sixty thousand kilowatts (60,000 kW) of
reliable electrical capacity which SELLER agrees herein to make available to
HELCO from the Facility at the Metering Point under HELCO Dispatch, unless
adjusted as a result of a subsequent Capacity Test at the end of the Corrective
Period pursuant to Section 5.1B, if any, or by agreement of the parties.

     Conditions Precedent - The conditions listed in Section 2.3A.

     Consent to Assignment - Shall have the meaning in Section 23.12.

     Consents - All necessary consents to be executed in favor of HELCO in order
for HELCO to establish, exercise and enforce its rights under the Security
Agreement, the Mortgage, and the other Security Documents, as such consents may
be amended from time to time in accordance with the terms thereof.

     Consultation Period - The period defined in Section 3.3C(2).

     Contract Year - A 12 Calendar Month period which begins on the first day of
the calendar year following the Phase 2 In-Service Date; provided, however, that
                                                         --------  -------      
if the Phase 2 In-Service Date does not occur on January 1 of a given year, the
initial Contract Year shall consist of the period from the Phase 2 In-Service
Date to December 31 of that calendar year.

     Corrective Period - The period defined in Section 5.1B(3)(a)

     CT - Shall mean combustion turbine and related equipment.

                                       3
<PAGE>
 
     Deferral Costs - Shall have the meaning in Section 3.3C(1).

     Deferral Fee - Shall have the meaning in Section 3.3C(1).

     Dispatch Constraints - The constraints and procedures with respect to the
operation of the Facility set forth in Section 3.2C, which shall include
equipment-related constraints on HELCO's ability to dispatch the Facility.

     Dispatch Notice - The notice given to SELLER by HELCO in accordance with
Section 3.3A(3), instructing SELLER to operate the Facility at a requested
capacity, expressed in kW, until modified by a subsequent Dispatch Notice.

     DoH - The State of Hawaii Department of Health.

     Dollars - The lawful currency of the United States of America.

     End of Phase 2 Start-Up - The date that is 12 months following the Phase 2
In-Service Date.

     Energy Charge - The amount to be paid by HELCO to SELLER pursuant to
Section 5.1A of this Agreement for the energy delivered to HELCO's electrical
system from the Facility as measured at the Metering Point.

     Energy Cost Adjustment Clause - The cost recovery mechanism established by
the PUC rules whereby the base electric energy rates charged to retail customers
are adjusted to account for fluctuations in the costs of fuel and purchased
energy or such successor provision that may be established from time to time.

     EMS (Energy Management System) - The real-time, computer-based control
system, or any successor thereto, used by HELCO, now or in the future, to manage
the supply and delivery of electrical energy to its consumers.  It provides
power system operators with an integrated set of manual and automatic functions
necessary for the operation of the power system under both normal and emergency
conditions.  The major functions of the EMS include security monitoring (system
surveillance), supervisory control, generation control (automatic generation
control, economic dispatch control, and generation dispatch studies) and
security (on-line load-flow analysis and contingency evaluation).

     EAF (Equivalent Availability Factor) - The ratio (in percent) calculated in
accordance with the formula, terms and concepts defined by NERC GADS, based on
the Net Maximum Capacity of the Facility, unless otherwise defined in this
Agreement.

     EFOR (Equivalent Forced Outage Rate) - The ratio (in percent) calculated in
accordance with the formula, terms and concepts defined by NERC GADS, based on
the Net Maximum Capacity of the Facility, unless otherwise defined in this
Agreement.

     Event of Default - An event or occurrence specified in Section 7.1A or
7.1B.

                                       4
<PAGE>
 
     EWG (Exempt Wholesale Generator) - Shall have the meaning given it in the
Energy Policy Act of 1992, 15 U.S.C. Section 79z-5a.

     Execution Date - The date referred to in the first paragraph of this
Agreement.

     Facility - All real estate, equipment, fixtures and property owned, leased,
controlled, operated or managed in connection with the production and delivery
of electric energy by SELLER to HELCO's electrical system including, without
limitation, that cogeneration facility more fully described in Sections 2.1A and
B to be designed, built, owned and operated under this Agreement by SELLER on
the site leased or purchased by SELLER at Haina, Hawaii, together with all
equipment, fuel and other expendables, transformers, switchgear, protective
devices, fuel handling and residue disposal infrastructure, and other associated
property, both real and personal, necessary for proper operation of the
Facility, up through SELLER's step-up transformer high voltage bushing cable
connector.  Notwithstanding the above, between the time of the Phase 1 In-
Service Date and the Phase 2 In-Service Date, the Facility shall consist of that
portion of the Facility necessary to produce a net electrical generating
capability at the Metering Point of approximately twenty-two thousand kilowatts
(22,000 kW).

     Facility Functional Description - The description of the Facility as
described in Section 2.1B.

     Financing Documents - The loan agreements, notes, indentures, security
agreements, leases (including cross-border leases or leases involving sale-
leaseback transactions) and other agreements, documents and instruments relating
to the construction financing and permanent financing (including refinancing and
amendments) of the Facility by SELLER, as the same may be modified or amended
from time to time in accordance with the terms thereof.

     Financing Parties - Any and all lenders and equity investors, other than
the Guarantor(s), or any person affiliated therewith, providing construction
financing or permanent financing (including refinancing) for the Facility and
any and all nominees, trustees and collateral agents associated therewith.  For
purposes of any notices herein required to be delivered by HELCO to the
Financing Parties, it shall be sufficient for HELCO to deliver such notices to
the party designated under the Financing Documents as the collateral agent,
agent, trustee or nominee for such Financing Parties.

     Firm Capacity - The amounts of capacity which SELLER declares for the
Facility in accordance with Section 3.2C(22): (i) at the time of the Phase 1 In-
Service Date and Phase 2 In-Service Date, respectively; (ii) at the end of the
Corrective Period pursuant to Section 5.1B(3)(c); or (iii) at the time of
subsequently agreed-upon test periods in which SELLER proposes to adjust the
Firm Capacity in accordance with the procedures set forth in "Attachment L";
provided, however, that HELCO's System Operator may specify a lower level of
- --------  ------                                                            
electric output for portions of the forty-eight (48) hour test period and the
Firm Capacity may still be declared without taking into account the reduction
specified by HELCO's System Operator if the Facility thereafter returns to the
declared level during the test period or the level requested by HELCO's

                                       5
<PAGE>
 
System Operator, whichever is lower.  The Firm Capacity shall not exceed
Committed Capacity except as otherwise provided in this Agreement, or by
agreement of the parties.

     Fixed O&M Component - Shall have the meaning in Section 5.1B.

     Force Majeure - Any event defined in Section 15.1 as a Force Majeure event.

     Fuel - Naphtha or No. 2 fuel oil or any replacement or substitute fuel
determined by SELLER to be suitable for the operation of the Facility in
accordance with this Agreement, applicable permits and equipment manufacturer
specifications relating to the Facility.

     Fuel Supply Agreement - The agreement, a copy of which is delivered to
HELCO pursuant to Section 2.3A(2)(i), under which SELLER obtains Fuel for the
Facility.

     General Manager - The person appointed by SELLER to act as general manager
for the Facility.

     Good Engineering and Operating Practices - The practices, methods and acts
engaged in or approved by a significant portion of the electric utility industry
for similarly situated U.S. facilities, considering geographic and other
characteristics, that at a particular time, in the exercise of reasonable
judgment in light of the facts known or that reasonably should be known at the
time a decision is made, would be expected to accomplish the desired result in a
manner consistent with law, regulation, reliability, safety, economy and
expedition.  With respect to the Facility, Good Engineering and Operating
Practices include, but are not limited to, taking reasonable steps to ensure
that:

     1.  Adequate materials, resources and supplies, including Fuel, are
available to meet the Facility's needs under normal conditions and reasonably
anticipated abnormal conditions.

     2.  Sufficient operating personnel are available and are adequately
experienced and trained to operate the Facility properly, efficiently and within
manufacturer's guidelines and specifications and are capable of responding to
emergency conditions.

     3.  Preventive, predictive, routine and non-routine maintenance and repairs
are performed on a basis that ensures reliable, long-term and safe operation
consistent with manufacturer's recommendations, and are performed by
knowledgeable, trained and experienced personnel utilizing proper equipment,
tools, and procedures.

     4.  Appropriate monitoring and testing is done to ensure that equipment is
functioning as designed and to provide assurance that equipment will function
properly under both normal and emergency conditions.

     5.  Equipment is operated in a manner safe to workers, the general public
and the environment and in accordance with equipment manufacturer's
specifications, including, without limitation, defined limitations such as steam
pressure, temperature, moisture content, chemical

                                       6
<PAGE>
 
content, quality of make-up water, operating voltage, current, frequency,
rotational speed, polarity, synchronization, control system limits, etc.

     GDPIPD (Gross Domestic Product Implicit Price Deflator) - The value shown
in the United States Department of Commerce, Bureau of Economic Analysis'
publication entitled "Survey of Current Business" for the percentage change in
prices over each quarter of the year associated with the Gross Domestic Product
for the immediately preceding quarter, or, a successor publication or index.

     Guarantee(s) - The Guarantee Agreement(s) in the form of Attachment T
between HELCO and Guarantor(s), as the same may be modified or amended from time
to time in accordance with the terms thereof.

     Guaranteed Amount - The amount described in Section 21.2.

     Guarantor(s) - The entity or entities which guarantee SELLER's obligations
under this Agreement in accordance with the Guarantee(s) and with Article XXI
hereof.

     Hawaiian Electric Industries, Inc. - The holding company incorporated in
1983 under the laws of Hawaii and having Hawaiian Electric Company, Inc., the
parent company of HELCO, and other companies as its subsidiaries.

     HELCO Dispatch - HELCO's right, through supervisory equipment or otherwise,
to direct or control (if EMS is applicable) both the capacity and the energy
output of the Facility subject to the Dispatch Constraints, which dispatch shall
include real power, reactive power, voltage, frequency, the number of Facility
units on-line to meet an electrical output requirement, including the
determination to cycle a unit or units off-line, require a unit to run in simple
cycle mode when not able to operate in combined cycle mode, the distribution of
electrical output among the Facility units on-line, the droop control setting of
each on-line unit, the ramp rate setting of each on-line unit, and other
characteristics of such energy output whose parameters are normally controlled
or accounted for in a utility dispatching system.

     HELCO's System Operator - The individual designated by job position as
HELCO's representative to act on behalf of HELCO on all issues regarding the
daily dispatch of all generation being supplied to HELCO's electrical system.

     In-Service Date Deadline(s) - The date(s) described as such in
Section 3.2A(3).

     Initial Acceptance Test -- The initial acceptance test for Phase 1 or Phase
2, performed in accordance with the procedure set forth in "Attachment L".

     Independent Engineering Assessment - the determination by a Qualified
Independent Engineer made pursuant to Section 3.3D(1).

     Interconnection Agreement - the agreement between HELCO and SELLER in the
form attached as "Attachment E" which sets forth the parties' respective rights
and obligations with

                                       7
<PAGE>
 
respect to the design, installation, operation, ownership and cost
responsibility for the facilities necessary to interconnect the Facility with
HELCO's electrical system.

     Interconnection Facilities - Shall have the meaning attributed to it in the
Interconnection Agreement.

     kVAR - Kilovar(s)

     kVARh - Kilovar-hour(s)

     kW - kilowatt(s).

     kWh - kilowatt-hour(s).

     Late Charges - Shall have the meaning set forth in Section 2.4B.

     Liquidated Damages - Shall mean any of the Liquidated Damages provided for
in Article VIII.

     Maintenance Account - Shall have the meaning set forth in Section 8.3.

     Major Equipment Overhaul - Shall mean combustion-turbine hot section
overhaul or replacement, complete turbine overhaul or replacement, steam turbine
overhaul or replacement or other major scheduled maintenance conducted (i) in
accordance with the equipment manufacturer's recommendations or (ii) otherwise
in the judgment of SELLER in accordance with Good Engineering and Operating
Practices.

     Metering Point - The physical point located on the high side of the step up
transformer, as depicted in "Attachment A" at which HELCO's metering is
connected to the Facility for the purpose of measuring the output of the
Facility in kilowatts, kilowatt-hours, kilovars and kilovarhours.

     Milestone Dates - The dates in "Attachment B" for completion of certain
critical path activities.

     Milestone Events - The events described in "Attachment B."

     Monthly Fuel Oil Adjusted Factor Filing - HELCO's filing, from time to
time, which includes certain charges relating to the cost of delivered No. 2
fuel oil at Keahole, Hawaii.

     Monthly Invoice - The monthly billing document described in Section 6.1.

     Mortgage - The mortgage, assignment of rents and security agreement to be
executed by SELLER, in accordance with Section 3.1E, in favor of HELCO, granting
to HELCO a mortgage and a lien on, among other things, SELLER's right, title and
interest in and to the Facility, the Site (including any lease or sublease
associated therewith, together with assignment of rents

                                       8
<PAGE>
 
under any such lease or sublease) and the rights and interests of SELLER
associated therewith, as the same may be modified or amended from time to time
in accordance with the terms thereof.

     Motion for Reconsideration - a motion to the PUC for reconsideration,
rehearing, further hearing, or modification, suspension, vacation, or a
combination thereof, of a PUC Order.

     MW - Megawatt(s).

     Net Electric Energy Output - For any period of time, the total electric
energy output of the Facility in kWh (net of auxiliaries) as measured at the
Metering Point of the Facility.

     Net Maximum Capacity - The maximum capacity the Facility can sustain over a
specified period of time when not restricted by seasonal or other deratings less
capacity utilized for the Facility's station service or auxiliaries, as measured
at the Metering Point, plus transformer losses (which for purposes of this
Agreement shall be deemed zero); provided that, in no event shall the Net
Maximum Capacity exceed the Firm Capacity.

     Net Salvage Proceeds - Shall have the meaning set forth in Section 3.3B(1).

     NERC GADS (North American Electric Reliability Council Generating
Availability Data System) - The data collection system called "Generating
Availability Data System" which is utilized by the North American Electric
Reliability Council, a voluntary organization formed by the electric utility
industry to promote the reliability and adequacy of the bulk power supply of the
electric utility systems in North America.  For purposes of this Agreement, the
version of NERC GADS dated October, 1996 (selected portions of which are
attached hereto as "Attachment C") shall be used whenever reference is made to
NERC GADS.  In the event that the definition of a term contained in this Article
I is inconsistent with the definition of the term under NERC GADS, the
definition contained in this Article I shall control.

     Non-appealable PUC Approval Order - A PUC Approval Order that is a Non-
appealable PUC Order.

     Non-appealable PUC Order - (1) A PUC Order that is not subject to appeal to
any Circuit Court of the State of Hawaii or the Supreme Court of the State of
Hawaii, because the thirty (30) day period permitted for such an appeal has
passed without the filing of notice of such an appeal, or (2) a PUC Order that
was affirmed on appeal to any Circuit Court of the State of Hawaii or the
Supreme Court, or the Intermediate Appellate Court upon assignment by the
Supreme Court, of the State of Hawaii, or was affirmed upon further appeal or
appellate process, and that is not subject to further appeal, because the
jurisdictional time permitted for such an appeal (and/or further appellate
process such as a motion for reconsideration or an application for writ of
certiorari) has passed without the filing of notice of such an appeal (or the
filing for further appellate process).

     Phase 1 - The portion of the Facility consisting of the first combustion
turbine generator and related facilities, put into commercial operation with a
Firm Capacity as determined at the Phase 1 In-Service Date.

                                       9
<PAGE>
 
     Phase 1 In-Service Date - The date, after satisfying the applicable
Conditions Precedent, on which SELLER declares Phase 1 of the Facility as ready
to be placed in service, based on actual operation of the Facility, under HELCO
Dispatch and in accordance with all the terms and conditions of this Agreement,
at an electric output level of at least nineteen thousand kilowatts (19,000 kW)
(net) at the Metering Point, and at such other lower levels consistent with
Section 3.3A(1) as specified by HELCO's System Operator, during a Capacity Test,
such Capacity Test having been scheduled on the start-up plan provided by SELLER
to HELCO in accordance with Section 5.1.

     Phase 1 In-Service Date Deadline - The date described as such in
Section 3.2A(3).

     Phase 1 Period - The time from the Phase 1 In-Service Date through the day
before the Phase 2 In-Service Date.

     Phase 2 - The full Facility consisting of Phase 1 plus the second
combustion turbine generator and the steam turbine generator, and related
facilities, put into commercial operation with a Firm Capacity as determined at
the Phase 2 In-Service Date.

     Phase 2 In-Service Date - The date on which SELLER declares Phase 2 of the
Facility as ready to be placed in service, based on actual operation of the
Facility, under HELCO Dispatch and in accordance with all the terms and
conditions of this Agreement, at an electric output level of at least forty-two
thousand kilowatts (42,000 kW) (net) at the Metering Point, and at such other
lower levels consistent with Section 3.3A(1) as specified by HELCO's System
Operator, during a Capacity Test, such Capacity Test having been scheduled on
the start-up plan provided by SELLER to HELCO in accordance with Section 5.1.

     Phase 2 In-Service Date Deadline - The date described as such in
Section 3.2A(3).

     Phase 2 Period - The time from the Phase 2 In-Service Date through the end
of the Term.

     Point of Interconnection - Shall have the meaning attributed to it in the
Interconnection Agreement.

     Pre-Deferral Estimate - Shall have the meaning in Section 3.3C(1).

     Prime Rate - The base interest rate for large commercial loans to credit-
worthy entities charged by the Bank of Hawaii in Honolulu, Hawaii and announced
as its Prime Rate, as such rate may be in effect from time to time.

     Project Costs Incurred - Shall have the meaning attributed to it in
Section 3.3B(1).

     Project Documents - This Agreement, the Thermal Energy Sales Contract, fee
title or any ground lease or other lease in respect of the Site, all
construction contracts to which SELLER is or becomes a party thereto, fuel
supply contracts to which SELLER is or becomes a party thereto, operation and
maintenance agreements, interconnection agreements in respect of the Facility
and all other agreements, documents and instruments to which SELLER is or
becomes a

                                       10
<PAGE>
 
party thereto in respect of the Facility, other than the Financing Documents and
the Security Documents, as the same may be modified or amended from time to time
in accordance with the terms thereof.

     PSD Permit - That "Covered Source/Prevention of Significant Deterioration"
permit/authority to construct to be issued in favor of the Facility by the DoH.

     PUC (Public Utilities Commission) - The Public Utilities Commission of the
State of Hawaii.

     PUC Approval Date - The date defined in Section 2.2F.

     PUC Approval Order - The decision and order of the PUC approving the
application or motion filed by the parties seeking approval of this Agreement as
described in Section 23.14.

     PUC Order - The decision and order of the PUC responding to the application
or motion filed by the parties seeking approval of this Agreement as described
in Section 23.14.

     PUC Order Date - The date upon which the PUC Order is issued.

     PUC Submittal Date - The date of submittal of HELCO's complete application
or motion for approval of this Agreement pursuant to Section 23.14.

     PURPA - Public Utility Regulatory Policies Act of 1978 (P.L. 95-617) as
amended from time to time and as applied in Hawaii by the Public Utilities
Commission.

     QF Requirements - As defined in Section 3.2L.

     Qualified Independent Engineer - Any engineer listed on the Qualified
Independent Engineer's List, as such list is amended from time to time.

     Qualified Independent Engineer's List - The list of Qualified Independent
Engineers attached hereto as "Attachment H" and created and modified from time
to time pursuant to Section 3.3D(1).

     QF (Qualifying Facility) - A facility that meets the criteria established
under PURPA and 18 CFR Part 292, and Title 6, Chapter 74 of the Hawaii
Administrative Rules.

     QLPU (Quick Load Pick Up) - The ability of a generating unit to pick up and
sustain a stated percentage of its Spinning Reserve within a given number of
seconds.

     Reserve Shutdown - The status of a generator that has been taken off-line
at the direction of HELCO's System Operator, as determined in accordance with
NERC GADS.

     Salvage Period - Shall have the meaning in Section 3.3B(1).

     Second Notice - The notice described in Section 3.3D(1).

                                       11
<PAGE>
 
     Security Agreement - The Security Agreement to be executed by SELLER in
favor of HELCO in accordance with Section 3.1E granting HELCO a security
interest in, among other things, all of SELLER's right, title and interest in
and to the Facility, the Project Documents, all accounts established pursuant to
the Project Documents, all insurance proceeds in respect of the Facility and all
proceeds of the foregoing, as the same may be modified or amended from time to
time in accordance with the terms thereof.

     Security Documents - The Security Agreement, the Mortgage, and the
Consents, together with all uniform commercial code financing statements and
other agreements, consents, documents and instruments executed in connection
therewith, as the same may be modified or amended from time to time in
accordance with the terms thereof.

     Settlement Date - The date defined in Section 3.3B(1).

     Simple Cycle - The operation of the Facility without the ST operating.

     Site - The contiguous piece of real property upon which the electric
operation and related non-real property portions of the Facility are located, as
further described in Section 2.1C.

     Site Rep - HELCO's representative as described in Section 9.5.

     Spinning Reserve - The difference between the load currently carried on the
Facility while synchronized and on-line and the Facility's Net Maximum Capacity,
both measured at the same instant in time.

     Substation - The assemblage of equipment that switches and/or changes or
regulates the voltage of electricity delivered to HELCO's electrical system from
the Facility as indicated in "Attachment A."

     ST - The steam turbine and related equipment.

     Subordination Agreement - Shall have the meaning in Section 3.1E(1).

     Term - The term of this Agreement as defined in Section 2.6.

     Thermal Energy Sales Contract(s) - The contract(s) between SELLER and an
industrial thermal energy buyer for the sale by SELLER of thermal energy.

     Transition Period - The period of time between the End of Phase 2 Start-Up
and the start of the next Contract Year.

     Unit Trips - The sudden and immediate removal of one (1) or more of the
Facility's generator(s) from service as a result of immediate
mechanical/electrical/hydraulic control system trips or operator initiated
action which causes a similar immediate removal from service; provided, however,
                                                              --------  ------- 
that Unit Trips shall not include:  (1) any removal of a generator which occurs
within one (1) hour of when that particular unit was synchronized or
resynchronized; or (2) trips caused or initiated by HELCO other than pursuant to
Section 4.1 in circumstances

                                       12
<PAGE>
 
described in Section 4.1A.  Unit Trips shall be counted as follows for each
incident, whether or not during an incident the loss of multiple generators is
simultaneous:  (i) two (2) Unit Trips result when two (2) combustion turbines go
off-line;  (ii) two (2) Unit Trips result when one (1) combustion turbine and
the steam turbine go off-line unless at the time of the incident only one (1)
combustion turbine was on-line and in that event, only one (1) Unit Trip
results;  (iii) one (1) Unit Trip results when one (1) combustion turbine goes
off-line; and, (iv) one (1) Unit Trip results when the steam turbine goes off-
line.  (Until such time that HELCO is operating its electrical system under a
criteria that mandates Spinning Reserve to cover loss of the largest unit on the
system, the removal of any of the Facility;s boilers or generators that is
(1) not in conformance with HELCO Dispatch and (2) directly results in HELCO
having to temporarily disrupt the delivery of electric service to any HELCO
customers shall also be considered a Unit Trip.)

     U.S. EPA - The United States Environmental Protection Agency.

     Variable O&M Component - Shall have the meaning in Section 5.1A.

     Weekly Unit Commitment Schedule - The written notice delivered in
accordance with Section 3.3A(3), stating for each day of the following week the
times at which all generating facilities on HELCO's electrical system shall
start up and shut down.

     60-Month Schedule - Shall have the meaning in Section 3.2C(8).

                        ARTICLE II - SCOPE OF AGREEMENT

2.1  General Description
     -------------------

     A.  Basic Concept
         -------------

          SELLER will design, construct, own, operate and maintain an
approximately sixty thousand kilowatt (60,000 kW) (net) cogeneration facility to
produce electricity and thermal energy at Haina, Hawaii.  The Facility will be
constructed in two phases.  Phase 1 is intended to be placed in commercial
operation prior to Phase 2 and will consist of a single CT.  Phase 2 of the
Facility will consist of two CTs and an ST.  Following the Phase 1 In-Service
Date and during the Term of this Agreement, electricity from the Facility will
be sold to HELCO under HELCO Dispatch for use in HELCO's electrical system.  The
Facility shall be designed, constructed, operated and maintained by SELLER so
that it will be available on the schedule provided for herein and shall
thereafter be available for service within the parameters set forth herein.

     B.  Facility Specifications
         -----------------------

          The Facility Functional Description is attached to this Agreement as
"Attachment D."  The single-line diagram in "Attachment A" shall expressly
identify the Point of

                                       13
<PAGE>
 
Interconnection of the Facility to HELCO's electrical system.  The Facility
Functional Description includes all facilities required for importation,
receipt, storage and handling of fuel, waste collection, interim and final waste
disposal, condenser cooling water and any other facilities necessary for proper
operation of the Facility, except as herein provided.

     C.  Site
         ----

          The Site for the Facility will be located at Haina, Hawaii.  The
location and Facility layout are more particularly described in "Attachment F."

     D.  Electric Specifications
         -----------------------

          Power supplied by SELLER hereunder shall be in the form of three-
phase, 60 Hertz alternating current, at a nominal operating voltage of thirteen
thousand eight hundred (13,800) volts and power factor dispatchable in the range
of 0.85 lagging to 0.98 leading as measured at the Metering Point to maintain
system operating parameters as specified by HELCO, with a minimum net generation
design capacity of sixty thousand kilowatts (60,000 kW) for the full Facility in
combined cycle mode.  Not later than thirty (30) days after the PUC Approval
Date, SELLER and HELCO shall reasonably mutually agree in writing to additional
standards, if any, for the quality of electricity, including but not limited to
standards for voltage flicker and generation of harmonic frequencies, that shall
apply to the electricity generated by SELLER.

     E.  Fuel and Other Expendables
         --------------------------

          SELLER will contract for, acquire or otherwise provide for a reliable
supply of Fuel and other expendables necessary to operate the Facility.

2.2  Effective Date/Regulatory Approval
     ----------------------------------

     A.  Effective Date of Agreement
         ---------------------------

          This Agreement shall become effective on the Execution Date, provided,
                                                                       ---------
that, notwithstanding the foregoing, prior to the PUC Approval Date (i) in no
- ----                                                                         
event shall SELLER be obligated to sell capacity and energy to HELCO, or have
any other obligations to HELCO other than those set forth in Sections 2.2, 2.3A,
2.7, 3.2A(1) (only as to obligations with respect to design and acquiring land
rights) (2) (4) and (5), 3.3B, 3.3C, Articles XI, XIII, XIV, XV, XVII, XIX, XXII
and XXIII and (ii) in no event shall HELCO be obligated to make any payments
provided for herein to Seller or have any other obligations to SELLER other than
those set forth in Sections 2.2, 2.3B, 2.7, 3.1E, 3.2A(4) and (5), 3.3B and 3.3C
and Articles XI, XIV, XV, XVII, XIX, XXII and XXIII.

     B.  Effect of Delay or Denial of PUC Approval
         -----------------------------------------

          If, despite the best efforts of the parties, neither a PUC Approval
Order nor a PUC Order partially or conditionally approving this Agreement that
is subject to Section 2.2D or Section 2.2E hereof, is obtained within twelve
(12) months of the PUC Submittal Date, HELCO

                                       14
<PAGE>
 
or SELLER may, by written notice delivered within thirty (30) days of such date,
declare this Agreement null and void and the parties hereto shall thereafter be
free of all obligations hereunder and shall pursue no further remedies against
one another, except as provided in Article XI and Section 2.2H hereof; provided,
                                                                       -------- 
however, that, notwithstanding delivery of such notice, the date specified above
- -------                                                                         
may be extended by a subsequent written agreement.  During the period until
twelve (12) months following the PUC Submittal Date, and any period of
extension, SELLER and HELCO shall be each obligated to continue performance of
their obligations under this Agreement which are by their terms applicable prior
to the PUC Approval Date.  If neither party elects to terminate within the time
frame stated above, this Agreement shall continue in full force and effect,
subject to the other provisions of the Article II.

     C.  Effect of Delay in Obtaining Non-Appealable PUC Approval Order
         --------------------------------------------------------------

          If, despite the best efforts of the parties, a Non-appealable PUC
Approval Order is not obtained within twenty-four (24) months from the PUC
Submittal Date, SELLER may, by written notice delivered to HELCO within thirty
(30) days of such date, declare this Agreement null and void and the parties
shall thereafter be free of all obligations hereunder and shall pursue no
further remedies against one another, except as provided in Article XI and
Section 2.2H hereof; provided, however, that, if SELLER does not elect to
                     --------  -------                                   
terminate within the time frame stated above, this Agreement shall continue in
full force and effect, subject to the other provisions of Article II.

     D.  Effect of Partial Approval of Payment Terms
         -------------------------------------------

          In the event that the initial PUC Order does not allow for the
recovery by HELCO of the full power purchase costs under this Agreement (i.e.,
capacity payments and energy payments as well as other costs) in HELCO's base
rates and/or Energy Cost Adjustment Clause, as the case may be, in the amounts
agreed to in this Agreement, but the PUC Order is otherwise satisfactory to
HELCO and SELLER in all other material respects, then SELLER has the option to
(1) accept such lower payment rates as are approved by the PUC, in which case
the parties shall make conforming changes to this Agreement; (2) seek
reconsideration, which Motion shall be filed no later than 30 days after the
issuance date for the PUC Order, and, if unsuccessful, appeal the PUC's
determination, in which case, SELLER shall have accepted such lower power
purchase costs provided for in the PUC Order, pending the outcome of such
actions; or (3) terminate this Agreement by written notice delivered within
thirty (30) days of the earlier of (i) the issuance date of such initial PUC
Order, or (ii) the date twenty-four (24) months following the PUC Submittal
date, without further liability or obligation except as provided in Articles XI
and Section 2.2H hereof.  If SELLER elects to proceed under clause (2) above,
and is unsuccessful in obtaining a Non-appealable PUC Approval Order, then
SELLER shall be deemed to have accepted the lower power purchase costs provided
for in the final PUC Order, in which case the parties shall make conforming
changes to this Agreement.  If SELLER does not elect to proceed under clause (2)
above, and does not terminate this Agreement by timely written notice under
clause (3) above, SELLER shall be deemed to have elected to proceed under
clause (1) above, provided that if higher allowed power purchase costs are
                  -------------                                           
subsequently

                                       15
<PAGE>
 
authorized by the PUC, HELCO shall be obligated to pay SELLER such additional
amounts for which actual recovery subsequently has been approved by the PUC.

     E.  Conditional PUC Approval
         ------------------------

          If the initial PUC Order requires any material change to this
Agreement, imposes any material condition upon such approval, or rejects a
material provision of this Agreement, the parties shall promptly meet to
determine in good faith whether it is in the parties' mutual interest to seek
reconsideration from the PUC.  If the parties do not determine within thirty
(30) days of the PUC Order to seek reconsideration, or the parties determine to
proceed with such reconsideration but are not successful in obtaining a PUC
Approval Order without such change, condition or rejection within ninety (90)
days of the PUC Order, either party may, by written notice delivered to the
other party within ten (10) days after expiration of the foregoing thirty (30)
day or ninety (90) day periods, as applicable, elect to renegotiate this
Agreement.  If such notice of intent to renegotiate this Agreement is delivered,
the parties shall (A) use their best efforts and negotiate in good faith to
agree within three (3) months from such notice upon a mutually satisfactory
amendment to this Agreement, which to the extent possible eliminates any
material adverse effect on either party and preserves the economic and
operational arrangements between the parties as set forth in this Agreement, and
(B) resubmit this Agreement, as so amended, to the PUC for approval of the
Agreement, as amended.  If, despite good faith efforts, the parties are unable
to reach agreement on a satisfactory amendment within such three (3) month
period, or obtain PUC approval of such amended agreement within six (6) months
of the date of submittal to the PUC, or if a notice of intent to renegotiate
this Agreement is not delivered, the party which is materially adversely
affected by such change, condition or rejection may, upon written notice
delivered to the other party within thirty (30) days of the earlier of
(i) expiration of the foregoing three (3) month, six (6) month, or ten (10) day
periods, as applicable, or (ii) the date twenty-four (24) months following the
PUC Submittal Date, elect to terminate this Agreement, without any further
liability or obligation to the other party except as provided in Article XI and
Section 2.2H hereof.  If a party that is materially adversely affected by such
material change, condition or rejection does not terminate this Agreement by
timely written notice, the materially adversely affected party shall be deemed
to have accepted such material change, condition or rejection, and the parties
shall make conforming changes to this Agreement.

     F.  PUC Approval Date  The PUC Approval Date shall be defined as follows:
         -----------------                                                    

          (1) If a PUC Approval Order is issued, and is not made subject to a
Motion for Reconsideration or an appeal, the PUC Approval Date shall be thirty
(30) days after the issuance date of the PUC Approval Order.

          (2) If the PUC Approval Order becomes subject to a Motion for
Reconsideration, and the Motion for Reconsideration is denied or the PUC
Approval Order is affirmed after reconsideration, and such order is not made
subject to an appeal, the PUC Approval Date shall be deemed to be the issuance
date of the order denying reconsideration of or affirming the PUC Approval
Order.

                                       16
<PAGE>
 
          (3) If the initial PUC Order is subject to Section 2.2D or
Section 2.2E, and this Agreement is not terminated pursuant to the provisions of
such Sections, the PUC Approval Date shall be the earlier of (i) the date upon
which the right to terminate pursuant to Section 2.2D or Section 2.2E, as the
case shall be, shall cease, or (ii) the date twenty-four (24) months following
the PUC Submittal Date.

          (4) If the PUC Approval Order, or an order denying reconsideration of
the PUC Approval Order or affirming approval of the PUC Approval Order after
reconsideration, becomes subject to an appeal, then the PUC Approval Date shall
be the earlier of (i) the date upon which the PUC Approval Order becomes a Non-
appealable PUC Approval Order, or (ii) the date twenty-four (24) months
following the PUC Submittal Date.

     G.  Effect of Reconsideration or Appeal of PUC Approval Order
         ---------------------------------------------------------

          (1) If the PUC Approval Order is vacated or reversed in whole or in
material part, or is materially modified, by the PUC after reconsideration, such
that the resulting PUC Order is no longer a PUC Approval Order, and is not a PUC
Order partially or conditionally approving this Agreement that would be subject
to Section 2.2D or Section 2.2E hereof if it were an initial PUC Order (in which
event the parties shall proceed in accordance with Section 2.2D or Section 2.2E,
as the case may be), the parties shall seek reinstatement of the PUC Approval
Order.  If such efforts are not successful within twenty-four (24) months from
the PUC Submittal Date, HELCO or SELLER may, by written notice delivered within
thirty (30) days of such date, declare this Agreement null and void and the
parties shall thereafter be free of all obligations hereunder and shall pursue
no further remedies against one another, except as provided in Article XI and
Section 2.2H hereof.  In seeking reinstatement of the PUC Approval Order, HELCO
may, but shall not be required to, initiate or join in a Motion for
Reconsideration or an appeal from the resulting PUC Order, unless HELCO is a
required or necessary party to such Motion for Reconsideration.

          (2) If the PUC Approval Order is vacated, reversed or held invalid,
void or unlawful in whole or in material part, or the PUC Approval Order is
materially modified such that the resulting PUC Order is no longer a PUC
Approval Order, and is not a PUC Order partially or conditionally approving this
Agreement that would be subject to Section 2.2D or Section 2.2E hereof if it
were an initial PUC Order (in which event the parties shall proceed in
accordance with Section 2.2D or Section 2.2E, as the case may be), within
twenty-four (24) months after the PUC Submittal Date as a result of an appellate
order, the parties shall seek reinstatement of the PUC Approval Order.  If such
efforts are not successful within twenty-four (24) months from the PUC Submittal
Date, HELCO or SELLER may, by written notice delivered within thirty (30) days
of the date of such appellate order, declare this Agreement null and void and
the parties shall thereafter be free of all obligations hereunder and shall
pursue no further remedies against one another, except as provided in Article XI
and Section 2.2H hereof.  Nothing herein shall be construed to require HELCO to
initiate or join in a Motion for Reconsideration or an appeal from a PUC Order
issued in response to the parties' efforts to seek reinstatement of the PUC
Approval Order, unless HELCO is a required or necessary party to the Motion for
Reconsideration or appeal.

                                       17
<PAGE>
 
          (3) If the PUC Approval Order is vacated, reversed or held invalid,
void or unlawful in whole or in material part, or is materially modified, as a
result of an appellate order (i.e., as a result of an order by a court of
competent jurisdiction after appeal, or by the PUC upon remand after appeal) at
a date later than twenty-four (24) months from the PUC Submittal Date, and
SELLER does not terminate this Agreement pursuant to Section 2.2C, the parties
shall jointly seek reinstatement of the PUC Approval Order.  If such efforts are
not successful within twenty-four (24) months thereafter, this Agreement shall
be amended to eliminate any material adverse impact on HELCO of the appellate
order, or of the PUC Order issued upon further PUC proceedings, including but
not limited to any adverse impact on HELCO's ability to recover the full power
purchase costs under this Agreement, and to preserve to the extent possible, the
economic and operational arrangements between the parties as set forth in this
Agreement.

          (4) Pending resolution of the parties' efforts to reinstate the PUC
Approval Order, and the issuance of a final PUC Order upon further proceedings,
HELCO's obligation to make payments to SELLER under this Agreement shall be
limited to the amount of the power purchase costs that HELCO is allowed to
recover.  If the final PUC Order issued upon further proceedings does not allow
for the recovery by HELCO of the full power purchase costs under this Agreement,
HELCO's obligation to make payments to SELLER thereafter under this Agreement
shall be limited to the amount of the power purchase costs that HELCO is allowed
to recover pursuant to such PUC Order.  If higher allowed power purchase costs
are subsequently authorized by the PUC, HELCO thereafter shall be obligated to
pay SELLER such additional amounts for which actual recovery has been approved
by the PUC.  If HELCO has paid or becomes obligated to pay SELLER any amounts
pursuant to this Agreement prior to the date the final PUC Order issued upon
further proceedings becomes a Non-appealable PUC Order that HELCO has not been
able and/or will not be able to recover through its base rates or Energy Cost
Adjustment Clause, and/or if HELCO has recovered such amounts but is or will be
required to refund to its customers amounts attributable to this Agreement,
SELLER shall repay such amounts to HELCO within thirty (30) days of receipt of
HELCO's written demand for repayment.

          (5) If the initial PUC Order is subject to Section 2.2D or
Section 2.2E, and the Agreement is not terminated pursuant to the provisions of
such sections, then the initial PUC Order, or a subsequent PUC Order or PUC
Approval Order if the initial PUC Order is amended as a result of a Motion for
Reconsideration filed by SELLER or by the parties, shall be deemed to be a PUC
Approval Order for purposes of Section 2.2F and 2.2G.

     H.  Obligations of Parties Upon Termination.
         --------------------------------------- 

          If pursuant to Section 2.2B, 2.2C, 2.2D, 2.2E, or 2.2G, a party
exercises its right to terminate, this Agreement shall be terminated and null
and void and the parties hereto shall be free of all obligations hereunder,
other than as provided under Article XI, except that if SELLER exercises its
right to terminate, then SELLER shall reimburse HELCO for its reasonable,
documented out-of-pocket costs in seeking PUC Approval as provided in
Article XXII.

                                       18
<PAGE>
 
2.3  Conditions Precedent.
     -------------------- 

     A.  HELCO Conditions Precedent.
         -------------------------- 

          Subject to and consistent with the provisions of Sections 2.2, 2.3B,
2.4 and 2.5, HELCO's obligation to purchase energy and/or capacity from SELLER
pursuant to this Agreement, and any and all obligations of HELCO which are
ancillary to that purchase, including, without limitation, HELCO's obligations
under Articles IV, V and VI and Sections 3.1, 3.2E, and 3.3A and B, are
contingent upon the following:

          (1) Following the Execution Date -  Within sixty (60) days after the
PUC Submittal Date, SELLER shall provide HELCO with either, at SELLER's option,
the available design materials listed in "Attachment O" or other evidence
reasonably demonstrating that the Facility, if constructed, operated and
maintained pursuant to the design materials and in accordance with Good
Engineering and Operating Practices, can be reasonably expected to have a useful
life at least equal to the Term.

          (2) On or Before Closing Date - On or before the Closing Date, SELLER
shall provide HELCO with the following:

              (i) Copies of the following executed Project Documents, if
applicable, in each case redacted to exclude any confidential or proprietary
information: (A) the Thermal Energy Sales Contract (if SELLER intends to be a
Qualifying Facility by selling useful thermal energy), which contract shall have
an initial term of at least two (2) years; (B) the Fuel Supply Agreement; and
(C) other contracts (if any) entered into by SELLER for the purchase of critical
materials and services necessary for the operation and maintenance of the
Facility;

              (ii) Copies of any and all then-required insurance policies (or
binders as appropriate) procured by SELLER in accordance with Article XIII
relating to the construction of the Facility, as the case may be;

              (iii) A certificate, executed by a duly authorized officer of
SELLER certifying that: (A) SELLER has the right to locate the Facility at the
Site for the Term and (B) SELLER has obtained all then-required permits,
consents, licenses, approvals and other governmental authorizations needed to
commence construction of the Facility.

          (3) On or Before Phase 1 In-Service Date - On or before the Phase 1
In-Service Date, SELLER shall provide HELCO with:

              (i) Copies of any and all then-required insurance policies (or
binders as appropriate) provided by SELLER required pursuant to Article XIII to
be in effect prior to operation of the Facility; and

              (ii) A certificate, executed by a duly authorized officer of
SELLER certifying that: (A) SELLER has obtained all then-required permits,
consents, licenses, approvals and other governmental authorizations needed to
operate the Facility throughout the

                                       19
<PAGE>
 
Term or, if one or more such permits, consents, licenses, approvals or
authorizations is not available at that time for the full Term, for such lesser
period as is available; and (B) construction of Phase 1 of the Facility is
substantially complete, that the Facility has been constructed substantially in
compliance with the terms of this Agreement and with the information submitted
pursuant to Section 2.3A(1) and (2), and that all operational testing has been
satisfactorily accomplished and the Facility is ready to begin producing power
on a commercial basis under the terms and conditions of this Agreement.

SELLER shall also provide any other materials required by Sections 2.3A(1) and
(2) if HELCO has, pursuant to 2.3B(1), extended the date for compliance with the
Phase 1 In-Service Date.

          (4) On or Before Phase 2 In-Service Date - On or before the Phase 2
In-Service Date, SELLER shall provide HELCO with either, at SELLER's option, a
certificate stating or other evidence reasonably demonstrating the items set
forth in Section 2.3A(3), as such items relate to Phase 2.

     B.  Failure of HELCO Conditions Precedent
         -------------------------------------

          (1) Right to Declare an Event of Default - If SELLER fails to comply
in full with any of the requirements of Section 2.3A and the requirements of
this Section 2.3B(1), HELCO may declare such failure an Event of Default under
Section 7.1A(3) and exercise its rights under Article VII.  In the event that
SELLER anticipates that it may fail to meet any of the requirements of
Section 2.3A, SELLER shall be given a reasonable additional period to meet such
requirements, if SELLER demonstrates that (i) SELLER is reasonably likely to
achieve the Phase 1 In-Service Date on or before fifteen (15) months after the
Phase 1 In-Service Date Deadline, as extended for Force Majeure, or as otherwise
provided herein, and (ii) SELLER is reasonably likely to achieve the Phase 2 In-
Service Date on or before fifteen (15) months after the Phase 2 In-Service
Deadline, as extended for Force Majeure, or as otherwise provided herein.  Upon
completing the undertakings set forth in the immediately preceding sentence and
not later than thirty (30) days prior to the applicable deadline for meeting any
requirement under Section 2.3A (without regard to any extension which may be
granted under this Section 2.3B(1)), SELLER shall certify to HELCO, in writing,
that HELCO has been provided with all material information necessary for HELCO
to make an informed decision with respect to such matters and that such
information is true and correct in all material respects and in no way
materially misleading.  Within thirty (30) days of HELCO's receipt of such
certification, HELCO shall give written notice to SELLER in which HELCO either
agrees to a new deadline specified in such notice (either by reference to a
fixed calendar date or to a defined event) for achieving compliance with the
requirement involved or declares an Event of Default in accordance with the
first sentence of this Section 2.3B(1).  If SELLER fails to comply substantially
with the requirements of Section 2.3A by such new deadline, HELCO may
immediately declare such failure an Event of Default in accordance with the
first sentence of this Section 2.3B(1).

          (2) SELLER's Declaration Requirements - Not later than ninety (90)
days after the PUC Submittal Date, SELLER shall submit to HELCO a written
statement declaring whether SELLER considers that it has complied with
Section 2.3A(1) and shall identify with

                                       20
<PAGE>
 
particularity the submissions on which it relies and shall certify that such
submissions are true and correct in all material respects and in no way
materially misleading.  On or before the Closing Date, SELLER shall submit to
HELCO a written statement declaring whether SELLER considers that it has
complied with Section 2.3A(2) and shall identify with particularity the
submissions on which it relies and shall certify that such submissions are true
and correct in all material respects and in no way materially misleading.  Not
later than fifteen (15) days following the Phase 2 In-Service Date, SELLER shall
submit to HELCO a written statement declaring whether SELLER considers that it
has complied with Section 2.3A(4) and shall identify with particularity the
submissions on which it relies and shall certify that such submissions are true
and correct in all material respects and are not materially misleading.

          (3) HELCO's Declaration Requirements - HELCO shall be deemed to have
waived its right to declare any failure by SELLER to comply in full with the
requirements of Sections 2.3A(1), 2.3A(3) or 2.3A(4) to be an Event of Default
if (i) with respect to any extension requested by SELLER under Section 2.3B(1),
HELCO fails to deliver to SELLER written notice in accordance with
Section 2.3B(1) or (ii) with respect to all other requirements under
Section 2.3B(1), HELCO fails to declare an Event of Default within 30 days of
receiving the written statement required under Section 2.3B(2) relating to
Sections 2.3A(1), (3) or (4).  Within thirty (30) days of receiving SELLER's
written statement pursuant to Section 2.3B(2), HELCO shall provide SELLER with
either a written declaration that SELLER has satisfied the requirements of
Section 2.3A(2), or a written statement setting forth the requirements HELCO
believes have not been met by SELLER.  HELCO's failure to provide SELLER with
such written declaration or statement within the foregoing thirty (30) day
period shall be deemed a waiver of its right to declare an Event of Default with
respect to the requirements set forth in Section 2.3A(2).  HELCO shall not be
deemed to have waived its right to declare an Event of Default if SELLER knew or
should have known that any of its submissions or declarations to HELCO under
Section 2.3 were materially incomplete, inaccurate or misleading.

2.4  Failure to Meet Milestone Dates
     -------------------------------

     A.  Right to Declare Event of Default
         ---------------------------------

          (1) Failure to Achieve Milestones - If SELLER fails to achieve any
Milestone Event within three (3) months after its Milestone Date as set forth in
"Attachment B," as extended for reasons of Force Majeure or as otherwise
provided in this Agreement, SELLER shall within thirty (30) days thereafter
submit for HELCO's review and approval, which approval shall not be unreasonably
withheld, a detailed plan which describes (i) the reasons why such Milestone
Event was not achieved, (ii) SELLER's proposed measures for achieving such
Milestone Event as soon as practicable thereafter, and (iii) SELLER's proposed
measures for meeting the Phase 1 In-Service Date and Phase 2 In-Service Date by
not more than six (6) months after the Phase 1 In-Service Date Deadline and
Phase 2 In-Service Date Deadline, respectively.  Until such Milestone Event is
met, SELLER shall provide HELCO with monthly progress reports as to the status
of SELLER's efforts to achieve such Milestone Event.

                                       21
<PAGE>
 
          If SELLER thereafter fails to achieve any Milestone Event within nine
(9) months after its Milestone Date as set forth in "Attachment B" as extended
for reasons of Force Majeure or as otherwise provided in this Agreement, and if
HELCO reasonably determines that such failure makes it unlikely that the
Facility will achieve the Phase 1 In-Service Date by fifteen (15) months after
the Phase 1 In-Service Date Deadline or the Phase 2 In-Service Date by fifteen
(15) months after the Phase 2 In-Service Date Deadline, HELCO may, at any time
after nine (9) months after such Milestone Date, declare such failure to achieve
a Milestone Date an Event of Default and exercise its rights provided for in
Article VII; provided that, if HELCO does not exercise such right to declare an
             -------- ----                                                     
Event of Default within fifteen (15) months after such Milestone Date, it shall
be deemed to have waived its rights to declare an Event of Default in connection
with such failure.

          (2) Dispute Over HELCO's Determination - If SELLER disputes HELCO's
determination that SELLER has failed to achieve any task within the required
time period or disputes the reasonableness of HELCO's determination that the
Facility is unlikely to achieve the Phase 1 In-Service Date or Phase 2 In-
Service Date, as the case may be, within the stated periods provided in
Section 2.4A(1), SELLER may call for expedited arbitration of the issue in
accordance with Section 2.4C, and any related declaration of an Event of Default
by HELCO shall be stayed until such arbitration is concluded.  If the arbitrator
finds that SELLER has not failed to achieve such task within such time period or
the arbitrator rejects HELCO's determination as unreasonable, then any HELCO
declaration of an Event of Default hereunder shall be null and void.

     B.  Late Charges
         ------------

          In the event the Facility has not achieved either In-Service Date
Deadline by three (3) months after such In-Service Date Deadline, as extended
for reasons of Force Majeure or as otherwise provided in this Agreement, SELLER
shall pay to HELCO Late Charges as follows:

          (1) if either or both In-Service Date Deadlines are missed, the total
amount of $10,000 per day, commencing on the day following such three (3) month
period, until the earlier of: (X) the date on which the Facility achieves the
Phase 1 In-Service Date or Phase 2 In-Service Date, as the case may be,
associated with such missed In-Service Date Deadline; (Y) the date nine (9)
months after the Phase 2 In-Service Deadline; or (Z) the date on which HELCO
terminates this Agreement under Section 7.2; and

          (2) if either or both of the In-Service Date Deadlines are missed, the
total amount of $20,000 per day commencing on the date which is nine (9) months
after the Phase 2 In-Service Deadline, until the earlier of (X)the date on
which the Facility achieves the Phase 1 In-Service Date or the Phase 2 In-
Service Date, as the case may be, associated with such missed In-Service Date
Deadline, or (Y) the date on which HELCO terminates this Agreement under
Section 7.2;

Notwithstanding anything to the contrary in this Section 2.4B, if HELCO does not
exercise its termination right under Section 7.2 by the end of the fifteenth
(15th) month after the missed In-

                                       22
<PAGE>
 
Service Date Deadline (or if both In-Service Date Deadlines are missed, the
fifteenth (15th) month after the first missed In-Service Date Deadline), the
aforesaid Late Charges shall thereupon terminate unless prior to the end of that
period HELCO provides written notice to SELLER that it will refrain from
exercising its termination right under Section 7.2 for a further stated period
of time (not to exceed six (6) months without SELLER's written consent) to be
fixed by HELCO in said notice, based on HELCO's reasonable estimate of the time
required to achieve the Phase 1 In-Service Date and/or Phase 2 In-Service Date,
as applicable, in which case the aforesaid Late Charges shall continue during
the stated period of time thus fixed by HELCO. Late Charges shall be made in
immediately available funds on Monday of each week for amounts due with respect
to the previous seven (7) days except in the event of termination of this
Agreement in accordance with Section 7.2, in which event Section 7.2D shall
apply; provided, however, that in the event SELLER does not make any or all of
       --------  -------                                                      
such payments to HELCO on or before the due date for the initial Capacity Charge
payment under Section 5.1B, HELCO shall have the right to offset any unpaid
portion of such Late Charge against such initial Capacity Charge payment and, if
necessary, against each succeeding Capacity Charge payment until such Late
Charge is paid in full.  Unless HELCO declares an Event of Default and
terminates this Agreement for SELLER's failure to meet the Phase 1 In-Service
Date and/or Phase 2 In-Service Date in accordance with Section 7.1A(1), then, so
long as HELCO accepts delay of the Phase 1 In-Service Date and/or Phase 2 In-
Service Date, the payment of Late Charges as provided herein shall be HELCO.s
sole and exclusive remedy and SELLER's sole liability for damages for SELLER's
delay in achieving the Phase 1 In-Service Date and/or Phase 2 In-Service Date.

     C.  Arbitration
         -----------

          (1)  Time of the Essence

          The parties agree that time is of the essence in resolving any dispute
regarding the declaration of an Event of Default by HELCO pursuant to
Section 2.4A.  Accordingly, arbitration pursuant to this Section 2.4C shall be
the exclusive mechanism for resolving any such dispute, and the timetable set
out in this Section 2.4C shall be adhered to strictly.

          (2)  Designation of Arbitrator

          If SELLER disputes the declaration of an Event of Default by HELCO
pursuant to Section 2.4A, SELLER shall give written notice to HELCO of such
dispute within seven (7) days after receipt of said declaration of an Event of
Default.  Upon such written notice by SELLER, a single Qualified Independent
Engineer shall be designated as a single arbitrator to consider and resolve such
dispute as provided for herein.  The selection of such single arbitrator shall
be made from the list established in Section 3.3D(2) and the provisions of
Article XIV shall not apply to the selection of such arbitrator or to the
conduct of such arbitration.  If HELCO and SELLER do not agree upon the
arbitrator to be employed within seven (7) days after SELLER's notice of
dispute, SELLER shall designate the arbitrator from the list provided for under
Section 3.3D(2) not later than the seventh (7th) day following receipt by HELCO
of SELLER's notice of dispute.

                                       23
<PAGE>
 
          (3) Timing of Arbitrator's Decision

          The arbitrator shall complete all proceedings and issue his decision
with regard to the declaration of an Event of Default under Section 2.4A within
thirty (30) days of the date on which he is designated unless the arbitrator
determines that additional time is required in order to give adequate
consideration to the matter.  In such case the arbitrator shall state in writing
his reasons for believing that additional time is needed and shall specify the
additional period required.  Such additional period shall not in any event
exceed thirty (30) days.

          (4)  Standard to be Applied

          After hearing the parties' positions, the arbitrator shall determine
whether HELCO has exercised reasonable judgment in determining that SELLER's
failure to achieve a Milestone Event by the Milestone Date has made it unlikely
that the Facility will achieve the Phase 1 In-Service Date or Phase 2 In-Service
Date, as the case may be, by the periods set forth in Section 2.4A(1).

          (5) Effect of Arbitrator's Decisions

          Unless the parties otherwise agree, the arbitrator's decision shall
become binding upon the parties at such time as the decision is confirmed by
order of a court of competent jurisdiction pursuant to Chapter 658, Hawaii
Revised Statutes.

          (6)  Cost of Arbitration

          The parties shall each pay fifty (50) percent of the cost of the
arbitration.

2.5  No Waiver
     ---------

     Except as otherwise provided herein, failure by HELCO to invoke its rights
under Sections 2.3 or 2.4A with respect to any particular Condition Precedent or
Milestone Event shall in no way diminish HELCO's rights upon the failure of
SELLER to achieve any subsequent Condition Precedent or Milestone Event prior to
its applicable Milestone Date.  Notwithstanding any other provision hereof,
HELCO's failure to declare an Event of Default during the time periods provided
for in this Agreement shall not constitute a waiver if such failure is the
direct or indirect result of SELLER's misstatement of a material fact or
SELLER's omission of a material fact which is necessary to make any
representation, warranty, certification, guarantee or statement made (or notice
delivered) by SELLER to HELCO in connection with this Agreement (whether in
writing or otherwise) not misleading.

2.6  Term
     ----

     Subject to issuance of the PUC Order referred to in Section 23.14 and the
provisions of Sections 2.2A and 2.3A, the Term of this Agreement shall commence
upon the Execution Date and, unless extended pursuant to Section 2.6A below or
for periods of Force Majeure occurring

                                       24
<PAGE>
 
after the Phase 2 In-Service Date, or as otherwise provided in this Agreement,
this Agreement shall terminate on the 30th anniversary of the Phase 2 In-Service
Date of the Facility.

     A.  Extension of Term
         -----------------

          HELCO shall have the first opportunity to negotiate with SELLER to
purchase the capacity and/or Net Electric Energy Output of the Facility for
periods beyond the Term.  At the request of HELCO, SELLER shall enter into such
good faith negotiations at any time after the beginning of the fifth (5th)
calendar year prior to the end of the Term, shall attempt in good faith to reach
agreement with HELCO, and shall not negotiate with any other entity unless no
agreement has been reached between HELCO and SELLER as of thirty-six (36) months
prior to the end of the Term.  Unless otherwise specifically stated in writing
by HELCO, any negotiations commenced within such five (5) year period shall be
considered terminated as of the end of the Term.

     B.  Post Term
         ---------

          Upon expiration of the Term and any extensions thereof, the parties
hereto shall no longer be bound by the terms and conditions of this Agreement,
except to the extent necessary to enforce the rights and obligations of the
parties arising under this Agreement before the end of the Term.  However,
should the original Term end with the parties hereto actively negotiating for
the purchase of the Facility pursuant to Article XIX or the capacity and/or Net
Electric Energy Output of the Facility, then such Term shall be automatically
extended on a month-to-month basis under the same terms and conditions as
contained in this Agreement for so long as said negotiations continue in good
faith.  The month-to-month Term extensions shall end sixty (60) days after
either party notifies the other in writing that said negotiations have
terminated.

2.7  SELLER Financing
     ----------------

     Notwithstanding any other provisions in this Agreement, if within eight (8)
months from the Execution Date, SELLER has been unable, despite its reasonable
best efforts, to obtain a firm commitment (subject to customary conditions
including, without limitation, receipt of all required permits and approvals) by
a prospective lender or underwriter for construction and term non-recourse
project financing for the Facility on commercially reasonable terms and
conditions, taking into account the Facility's size, fuel type, technology,
geographic location and intended use of tax-exempt financing, then SELLER, at
its option, may terminate this Agreement without any liability or further
obligation on the part of either party under this Agreement, except as provided
in Articles XI and XXII and Section 2.2H; provided however, that HELCO shall
                                          -------- -------                  
have the option, upon the request of SELLER, to participate in good faith
negotiations with potential financing parties for a period of not less than
thirty (30) days to modify any terms of this Agreement as needed to acquire
financing on satisfactory terms and conditions; provided further, that
                                                -------- -------      
(A) during such negotiations the Milestone Dates and the In-Service Date
Deadlines shall be extended on a day-to-day basis; and (B) any such termination
under the terms of this Section 2.7 must occur, if at all, within the later of
(i) nine (9) months after the Execution Date; (ii) forty-five (45) days after
the PUC Order Date; (iii) sixty (60) days after the PUC Order Date if the PUC
Order amends any material provision of this Agreement; or (iv) the earlier of
sixty (60) days after

                                       25
<PAGE>
 
the date of filing of any Motion for Reconsideration of, or appeal from, the PUC
Order, or ten (10) days after the date such Motion for Reconsideration or appeal
is resolved.  SELLER shall reimburse HELCO for any out-of-pocket costs incurred
in connection with HELCO's participation in good faith negotiations with
potential financing parties pursuant to this Section 2.7.

          ARTICLE III - SPECIFIC RIGHTS AND OBLIGATIONS OF THE PARTIES

3.1  Rights and Obligations of Both Parties
     --------------------------------------

     A.  Sale and Purchase of Power
         --------------------------

          SELLER shall produce, supply and sell to HELCO and HELCO shall take
from SELLER and pay for the Firm Capacity and Net Electrical Energy Output as
determined hereunder under the terms and conditions established in this
Agreement.

     B.  Protection of Facilities
         ------------------------

          Each party shall be responsible for protecting its own facilities from
possible damage by reason of electrical disturbances or faults caused by the
operation, faulty operation or non-operation of the other party's facilities,
and such other party shall not be liable for any such damage so caused.

     C.  Good Engineering and Operating Practices
         ----------------------------------------

          HELCO and SELLER and all their employees, agents, assigns and
contractors shall act in accordance with Good Engineering and Operating
Practices in carrying out all actions under this Agreement.

     D.  Interconnection Facilities
         --------------------------

          Simultaneously herewith, SELLER and HELCO have entered into the
Interconnection Agreement.

     E.  Security Documents
         ------------------

          Concurrent with the Closing Date, SELLER and HELCO shall comply with
the following requirements:

          (1) SELLER shall execute and deliver to HELCO the Security Agreement
and the Mortgage, which shall contain terms and conditions reasonably
satisfactory to the Financing Parties and HELCO, to secure the performance by
SELLER of its payment obligations under this Agreement; provided, that HELCO
                                                        --------  ----
shall concurrently execute and deliver to Financing Parties and SELLER a
subordination agreement (the "Subordination Agreement") which shall contain
terms and conditions generally required by lenders of long-term, non-recourse
project loans and

                                       26
<PAGE>
 
provided further, that such terms and conditions shall be reasonably
- -------- -------  ----                                              
satisfactory to Financing Parties and HELCO, which shall use best efforts to
complete such documentation within sixty (60) days of the commencement of
negotiations. The Subordination Agreement shall subordinate, in all respects,
the Security Agreement and the Mortgage to the mortgage and security interest
provided to the Financing Parties in an amount and to the extent that such
security interest and mortgage secure such credit extended by the Financing
Parties to SELLER as shall be required for the development, construction and
operation of the Facility.

         (2)  SELLER and HELCO shall each execute and deliver to the other or
shall cause to be executed and delivered to the other any required consents.

         (3)  SELLER shall request the original Financing Parties and any
additional or substitute Financing Parties to become parties to such
documentation as is reasonably necessary to give effect to this Section 3.1E.

         (4)  SELLER and HELCO shall each execute and deliver to the other
favorable legal opinions of counsel, in reasonably satisfactory form and
substance, to the effect that this Agreement has been duly authorized and
executed by that party and constitutes a legally enforceable obligation binding
against that party in accordance with its terms, subject to customary
exceptions.

         (5)  SELLER and HELCO shall each execute and deliver to the other such
other documents and instruments, and take such other actions as may be
reasonably necessary (A) for HELCO to establish and perfect its rights under the
Security Documents and to obtain and give full effect to the security interest,
mortgage and priority contemplated hereby and (B) for SELLER to carry out the
transactions contemplated by the Financing Documents, as reasonably requested by
the Financing Parties.

3.2  Rights and Obligations of SELLER
     --------------------------------

     A.  Design and Construction of Facility
         -----------------------------------

         (1)  General - SELLER shall furnish all financial resources, labor,
tools, materials, equipment, transportation, supervision, and other goods and
services necessary to completely design and build the Facility as more
particularly described in Section 2.1B. SELLER shall also be responsible for
acquiring any and all necessary land rights for the Facility as well as for fuel
handling and waste disposal infrastructures. The design and construction of the
Facility as well as the acquisition of other necessary infrastructures shall
take place using Good Engineering and Operating Practices.

         (2)  Milestone Dates - Due to the critical nature of HELCO's energy
needs, the attainment of all Milestone Events, on or prior to applicable
Milestone Dates established as of the date of this Agreement and specified in
"Attachment B" as extended due to Force Majeure or as otherwise provided, is
essential, and SELLER will make all reasonable efforts to meet the Milestone
Dates. Unless a change in such dates is agreed to in writing between the
parties, a

                                       27
<PAGE>
 
failure to achieve a Milestone Event within three (3) months after its Milestone
Date shall be treated in accordance with the provisions of Section 2.4 and
Article VII, if applicable to such condition.

         (3)  In-Service Date Deadlines - The Phase 1 In-Service Date shall
occur no later than fourteen (14) months after the Execution Date or eight (8)
months after the PUC Approval Date, whichever is later (the "Phase 1 In-Service
Date Deadline") and the Phase 2 In-Service Date shall occur no later than
eighteen (18) months after the Execution Date or twelve (12) months after the
PUC Approval Date, whichever is later (the "Phase 2 In-Service Date Deadline")
unless extended as a result of Force Majeure or as otherwise provided in this
Agreement. A failure to achieve the Phase 1 In-Service Date or Phase 2 In-
Service Date by the dates specified in Section 7.1A(1) shall be treated in
accordance with the provisions of Section 2.4 and Article VII, if applicable to
such failure.

         (4)  Permits and Licenses - SELLER shall assume full responsibility for
the acquisition of all permits and licenses required for the construction and
operation of the Facility; provided that, HELCO shall cooperate with and shall 
                           -------- ----                                
not oppose SELLER's efforts in connection therewith. Notwithstanding anything to
the contrary, if SELLER does not obtain all permits necessary for construction
of the Facility within eight (8) months of the PUC Approval Date, SELLER shall
have the right to terminate this Agreement within thirty (30) days thereafter,
effective upon written notice to HELCO, and SELLER shall thereafter have no
further liability or obligations to HELCO, except as provided in Articles XI and
XXII; provided, that such right to terminate must be exercised no later than
      --------  ----
twenty-four (24) months after the PUC Submittal Date.

         (5)  Review of Facilities - SELLER shall make readily available to
HELCO, during normal business hours, non-proprietary, detailed engineering and
as-built drawings relating to the design and construction of the Facility within
a reasonable time after such drawings are available. HELCO shall have an
opportunity, from time to time, as reasonably requested by HELCO, to (a) review
and comment on the design of the Facility, (b) to observe the construction of
the Facility and the equipment to be installed therein and (c) to inspect the
Facility and related equipment following the completion of construction and/or
installation of Phase 1 and Phase 2; provided that, such activities do not
materially interfere with SELLER's construction or operation of the Facility.
Unless otherwise agreed to by the parties, HELCO shall, as soon as practicable,
but in no event later than thirty (30) days following provision to it of (i) any
design materials or (ii) any opportunity for inspection by it of the
construction of the Facility, review and provide comments thereon, and SELLER
shall, as soon as practicable, but in no event later than thirty (30) days after
receipt of such comments, respond in writing, either noting agreement and action
to be taken or reasons for disagreement. If SELLER disagrees with HELCO, it
shall note alternatives it will take to accomplish the same intent, or provide
HELCO with a reasonable explanation as to why no action is required by Good
Engineering and Operating Practices. In no event shall any review, comment or
failure to comment by HELCO be deemed to be an endorsement, warranty or waiver
of any right by HELCO or create any obligation by SELLER; provided, however,
                                                          --------  -------   
that HELCO shall be deemed to have waived its right to review, comment and
inspect under this Section 3.2A(5) with respect to any specific design materials
or inspection opportunity provided to it if it fails to exercise such specific
rights

                                       28
<PAGE>
 
within the thirty (30) day period referred to in this Section 3.2A(5) and such
subsequent untimely exercise of such specific rights would delay construction of
the Facility or cause material prejudice to SELLER.  In no event, however, shall
any failure by HELCO to exercise its rights under this Section 3.2A(5)
constitute a waiver by HELCO of, or otherwise release SELLER from, any other
provision of this Agreement.  In areas of common concern, such as the type and
settings of SELLER's protective relaying equipment, SELLER shall submit such
concerns, designs and settings for HELCO's review and comment.

     (6) Facility Protection Equipment -

         (i)  SELLER shall, at its own cost, furnish, install, operate and
maintain internal breakers, relays, switches, synchronizing equipment and other
associated protective and control equipment necessary to maintain the standard
of reliability, quality and safety of electricity production suitable for
parallel operation with HELCO's electrical system as required by Good
Engineering and Operating Practices. The Facility shall be designed so that it
does not trip for an electrical fault or transient condition in HELCO's
electrical system that will be cleared by primary protection. HELCO shall have
the right, but not the obligation, to review and accept the design of all such
equipment and protective relay settings as soon as practicable, and in no event
later than forty-five (45) days prior to the Closing Date and shall present any
comments relating thereto to SELLER, as soon as practicable and in no event
later than sixty (60) days after receiving such design information. HELCO shall
have the right, but not the obligation, to review, inspect and comment on any
future action by SELLER to modify or replace such equipment, or change such
settings, as soon as practicable, and in no event later than least forty-five
(45) days prior to such future action; provided, however, HELCO shall present
                                       --------  -------
any comments relating thereto to SELLER as soon as practicable, and in no event
later than forty-five (45) days after receiving information relating to such
future action. HELCO shall have the right, but not the obligation, to review,
inspect and accept the installation, construction and setting of all such
equipment in order to ensure consistency with the design submitted by SELLER for
HELCO's review. If HELCO exercises such right, HELCO shall inform SELLER as soon
as practicable, and in no event later than forty-five (45) days after such
review or inspection, of any problems it believes exist and any recommendations
it has for correcting such problems. HELCO's inspection and acceptance of
SELLER's equipment and settings shall not be construed as endorsing the design
thereof, nor as any warranty of the safety, durability or reliability of said
equipment and settings, nor as a waiver of any of HELCO's rights or constitute
any obligation of SELLER; provided, however, that HELCO shall be deemed to have
                          --------  -------
waived its right to review, inspect and accept under this Section 3.2A(6)(i),
with respect to any specific design materials, settings, or inspection
opportunity provided to it, if it fails to exercise such specific rights within
the forty-five (45) day periods referred to in this Section 3.2A(6)(i). In no
event, however, shall any failure by HELCO to exercise its rights under this
Section 3.2A(6)(i) constitute a waiver by HELCO of, or otherwise release SELLER
from, any other provision of this Agreement. SELLER and HELCO shall cooperate
with each other in good faith in agreeing upon design standards for any
equipment or settings referred to in this Section 3.2A(6)(i).

         (ii)  Within a reasonable time after receipt of HELCO's comments
referred to in Section 3.2A(6)(i) or notification by HELCO of problems related
to SELLER's

                                       29
<PAGE>
 
obligations under Section 3.2A(6)(i) but no later than ninety (90) days after
such notification (unless such condition is causing a safety hazard or damage to
HELCO's electrical system or HELCO's customer's facilities, in which event the
correction must be promptly made by SELLER), SELLER shall either implement
HELCO's proposals or SELLER's alternatives to accomplish the same purpose, and
shall inform HELCO of such action, or provide HELCO with a reasonable
explanation as to why such actions are not required by Good Engineering and
Operating Practices. Notwithstanding the foregoing, SELLER shall utilize relay
settings prescribed by HELCO, which may be changed over time within the design
capability of the equipment as HELCO's electrical system's requirements change.
If SELLER demonstrates that the utilization of such relay settings would likely
result or shall have resulted in an event normally requiring Liquidated Damages
or an Event of Default, SELLER shall be excused from same.

         (7)  Progress Reports - On the first day of each month following
approval of this Agreement by the PUC under Section 23.14 and continuing until
the Phase 2 In-Service Date, SELLER shall provide HELCO with monthly progress
reports containing a reasonable level of detail on the status of each specific
Condition Precedent contained in Section 2.3A and the status of efforts to meet
each Milestone Date. If, during any month, SELLER has reasonable cause to
believe that it will be unable to achieve any Milestone Date, it shall so inform
HELCO in the next monthly progress report. At HELCO's request, SELLER shall
provide an opportunity for HELCO to meet with appropriate personnel of SELLER or
its contractors to discuss and assess any such monthly progress report.

  B.  Operation and Maintenance of Facility
      -------------------------------------

         (1)  Standards - SELLER shall operate the Facility in accordance with
Good Engineering and Operating Practices. Subject to those standards, SELLER
shall deliver to HELCO the available Net Electric Energy Output of the Facility
under HELCO Dispatch and shall use all reasonable efforts to operate the
Facility in a manner that maximizes the overall reliability of HELCO's
electrical system. The Facility shall not trip for an electrical fault or
transient condition in HELCO's electrical system of less than 18 cycles
duration, or a resulting trip shall be considered a Unit Trip which shall count
towards the number of allowable Unit Trips under Section 3.2D(5).

      While a generator is on Reserve Shutdown, SELLER may not perform any
maintenance, inspections or repairs that could delay start-up of that generator
or impair that generator's ability to reach maximum electrical output, if so
directed by HELCO's System Operator.  Section 3.2C specifies performance
criteria for the start-up of a generator(s) in Simple Cycle and combined cycle
mode from Reserve Shutdown status.  SELLER shall seek permission from HELCO's
System Operator before SELLER voluntarily removes a generator from Reserve
Shutdown status; if such change in generator status by SELLER is involuntary,
SELLER shall promptly advise HELCO's System Operator.  Failure by SELLER to
promptly advise HELCO's System Operator of such a change from Reserve Shutdown
status shall be considered an unreported derating per Section 8.1C.  HELCO may
request SELLER to certify that the activities of SELLER during Reserve Shutdown
conform to the definition of Reserve Shutdown.

                                       30
<PAGE>
 
     (2)  Functioning Protective Equipment - SELLER shall operate the Facility
with all applicable installed system protective equipment in service whenever
the generator is connected to or is operated in parallel with HELCO's electrical
system, except for normal testing purposes in accordance with Good Engineering
and Operating Practices. SELLER shall have qualified personnel test and
calibrate all protective equipment at regular intervals not to exceed one (1)
calendar year. A unit functional trip test (which shall include an overspeed
trip test on the steam turbine) shall be performed annually in accordance with
industry standards. Following a Major Equipment Overhaul, a functional trip test
shall be performed and shall simulate abnormal trip conditions separately at
each primary element that initiates a trip and shall demonstrate that the trip
system produces the appropriate equipment response. In no event shall any trip
test conducted pursuant to this Section 3.2B(2) constitute a Unit Trip. If at
any time HELCO has reason to doubt the integrity of the Facility's protective
equipment and reasonably suspects that such purported loss of integrity would
jeopardize the reliability of HELCO's supply of electrical energy to its
customers, SELLER shall be required to reasonably demonstrate to HELCO's
satisfaction the correct calibration and operation of the equipment in question.
HELCO shall not be liable for any damage to SELLER's equipment resulting from
the failure of Facility protective equipment.

     (3)  Personnel and System Safety - SELLER shall provide, at a location
approved by HELCO, a manual disconnect device which provides a visible break to
electrically separate the Facility from HELCO's electrical system. Such
disconnect device shall be lockable in the OPEN position and accessible to HELCO
personnel at all times. Notwithstanding any other provision of this Agreement,
if at any time HELCO determines that the continued operation of the Facility (i)
is substantially likely to endanger the safety of persons and/or property,
(ii) is substantially likely to endanger the integrity of HELCO's electrical
system or (iii) is substantially likely to have an adverse effect on the
equipment of HELCO's customers and can be reasonably demonstrated to have such
adverse effect, then in each case (i) through (iii), HELCO shall have the right
to disconnect the Facility from HELCO's electrical system, giving as much
advance notice to SELLER as is practicable under the given circumstances. If the
Facility is separated from HELCO's electrical system for any reason, under no
circumstances shall SELLER reclose into HELCO's electrical system without first
obtaining specific approval to do so from HELCO's System Operator which approval
shall be granted promptly upon the removal of the cause stated in sub-clauses
(i) through (iii) above. The Facility shall remain disconnected until such time
that the condition specified under (i), (ii) or (iii) above has been corrected,
and HELCO shall not be obligated to accept or pay for any energy which might
otherwise have been received from the Facility during such Period. If HELCO
disconnects the Facility from HELCO's electrical system, it shall immediately
notify SELLER by telephone or hotline and thereafter confirm in writing the
reasons for the disconnection. The claim of occurrence of any event as described
in this Section 3.2B(3) shall be subject to verification by SELLER. SELLER shall
be paid the Capacity Charge regardless of the causes of disconnection. If it is
determined that HELCO did not have a valid reason for disconnecting the
Facility, the duration of the period of separation will not be counted against
EAF or EFOR or for the purpose of calculating any other performance standard.

                                       31
<PAGE>
 
     (4)  Operating Records - SELLER shall maintain, at least daily, a log in
which it shall record all pertinent data that will indicate whether the Facility
is being operated in accordance with Good Engineering and Operating Practices.
These data shall include, but not be limited to, all maintenance and inspection
work performed at the Facility, circuit breaker trip operations, relay
operations including target indications, megavar and megawatt recording charts
(and/or equivalent computer records), all unusual conditions experienced or
observed and any reduced capability and the reasons therefor and duration
thereof. SELLER shall provide HELCO access to SELLER'S records which identify
the priority, as internally assigned by SELLER, of specific preventive or
corrective maintenance activities. These records shall include items for which
SELLER has deferred the inspection or corrective action to a future scheduled
plant outage. In addition, SELLER shall provide copies of all written
correspondence between SELLER and the Financing Parties or SELLER and the
insurance underwriters for the Facility equipment pertaining to maintenance
practices, procedures and scheduling (including deferral) of maintenance at the
Facility. In addition, SELLER shall, within ten (10) Business Days, provide
HELCO with subsequent written confirmation any time SELLER experiences a Unit
Trip or other unplanned outages or deratings. Such written confirmation shall
contain information in sufficient detail for HELCO to analyze the incident,
including the date and time of occurrence as well as the cause of the Unit Trip,
if such cause is known. "Attachment M" is an example of a written confirmation.
HELCO shall have the right to request reasonable additional information if
necessary to evaluate the incident. In addition, if so requested by HELCO,
SELLER shall by 9:00 a.m. Hawaii Standard Time of each day provide HELCO with
hourly, electric output data for the prior day. Correction of any errors in this
data shall be provided to HELCO by noon Hawaii Standard Time of the following
day. Any and all records, correspondence, memoranda and other documents or
electronically recorded data related to the fueling, operation and maintenance
of the Facility shall be maintained by SELLER for a period of not less than six
(6) years. HELCO shall have the right to review and copy any such items upon
request.

     (5)  Maintenance Records - Prior to February 1 of each year, SELLER shall
submit, or make available to HELCO for inspection at the Site, a summary in a
format similar to the example provided in "Attachment G" of all maintenance and
inspection work performed in the prior calendar year. The summary shall present
the requested data in a meaningful and informative manner consistent with the
cooperative exchange of information between the parties. If available and
practicable, such summary shall be provided in electronic format with sufficient
software so that HELCO can group activities for specific process areas of the
Facility and be able to view the maintenance history of a specific equipment
item. Such summary shall also include SELLER's proposals for correcting or
preventing recurrences of identified equipment problems and for performing such
other maintenance and inspection work as is required by Good Engineering and
Operating Practices. Within sixty (60) days of receiving such summary, and after
any reasonable inspection desired by HELCO of the Facility and consultation with
SELLER, HELCO may provide written recommendations for specific operation or
maintenance actions or for changes in the operation or maintenance program of
the Facility. HELCO's making or failing to make recommendations with respect to
operation and maintenance of the Facility shall not be construed as endorsing
the operation and maintenance thereof or as any warranty of the safety,
durability or reliability of the Facility nor as a waiver of any HELCO right.
Within a reasonable time after HELCO makes such recommendations, not to exceed
 

                                       32
<PAGE>
 
ninety (90) days, SELLER shall implement HELCO's recommendations or SELLER's
alternatives to accomplish the same purpose, and shall so inform HELCO, or
explain to HELCO in writing why such actions are not reasonably required to
ensure that the short-term and long-term operation of the Facility are not
materially adversely affected or impaired, or why such actions are not required
by Good Engineering and Operating Practices.

      (6)  Major Outages - If SELLER believes that a major outage is required to
prevent a Catastrophic Equipment Failure, SELLER shall notify HELCO as soon as
practicable and HELCO shall promptly act, upon SELLER's request, to approve such
outage, which approval shall not be unreasonably withheld, delayed or
conditioned. If an outage under this Section 3.2B(6) does not occur until after
the next weekend period, it shall be considered a maintenance outage and shall
not count against SELLER for purposes of determining EFOR.

  C.  Delivery of Power to HELCO; Dispatch Constraints
      ------------------------------------------------

      (1)  Delivery Voltage Standards - Electricity generated by SELLER shall be
delivered to HELCO at the Point of Interconnection in the form of 3-phase, 60
Hertz alternating current at a nominal operating voltage of 69 KV with a maximum
limit of 72.45 KV and a minimum limit of 65.55 KV or such change in standards as
the parties mutually agree. The actual operating voltage will be under the
control of HELCO's System Operator, subject to the above limits.

      (2)  Frequency Standards - The electrical frequency of electric energy
delivered to HELCO by SELLER shall not vary by more than one-tenth (0.1) Hertz
from 60.00 Hertz, except during unavoidable momentary fluctuations. Frequency
will normally be controlled by HELCO's EMS. HELCO shall have the right to
utilize the Facility to regulate frequency on HELCO's electrical system
consistent with this Section 3.2C.

      (3)  Reactive kVAR Standards - HELCO's System Operator shall specify the
reactive kVAR requirements (power factor) with respect to the real power
delivered by SELLER to HELCO. Reactive kVAR requirements will be from 0.98
leading to 0.85 lagging power factor delivered by SELLER to HELCO. SELLER will
dispatch kVARs within this range as specified by HELCO's System Operator. HELCO
will not be obligated to purchase reactive kVARhs from SELLER. SELLER will
deliver or curtail delivery of reactive kVARhs as directed by HELCO's System
Operator consistent with Section 3.2 and the Dispatch Constraints. Under
special conditions when SELLER is delivering kilowatts to HELCO, SELLER shall,
if HELCO so requests, consume reactive kVARs up to 0.98 leading power factor
being delivered by SELLER to HELCO.

      (4)  Generator H Constant - In recognition of HELCOOs electrical system's
stability concerns, the Facility generator shall have an H constant of 1.2 or
higher. A lower value of H constant may be accepted by HELCO if supported by a
system stability study performed by HELCO and paid for by SELLER. In any case,
SELLER must obtain HELCO's written approval, which approval shall not be
unreasonably withheld, of the H constant in the installed equipment.

                                       33
<PAGE>
 
     (5)  Entire Output Delivered - During the Term, SELLER shall deliver to
HELCO in accordance with HELCO Dispatch the entire Net Electric Energy Output
associated with the Firm Capacity.

     (6)  Interconnection - SELLER shall deliver the electricity contracted for
under this Agreement to HELCO's electrical system at the Point of
Interconnection.

     (7)  Operation of Synchronizing Breakers - SELLER shall have the ability to
trip and close its generator synchronizing breakers located at the Facility.
HELCO will have trip control only and breaker status indication and current
telemetry over certain breakers, as shown in "Attachment A." SELLER shall notify
HELCO of all operations of these breakers, in advance of such operation if
practicable.

      (8)  Schedule of Outages - Prior to July 1 of each year, SELLER shall
submit for review and comment by HELCO an initial schedule of expected energy
delivery periods for the sixty (60) month period beginning with January of the
following year (the "60-Month Schedule"). The 60-Month Schedule shall supersede
any previous 60-Month Schedule and state the periods of operation, the dates and
duration of all scheduled shutdowns, reductions of output, and scheduled
maintenance, and the reasons therefor, including the scope of work for the
maintenance requiring shutdown or reduction in output of the Facility. SELLER
shall (i) revise such 60-Month Schedule to accommodate reasonable requests made
by HELCO no later than December 1 of the year preceding the year in which a
scheduled revision is requested to take place; provided that, if the requested
                                               -------- ---- 
revision is one of timing, the revised date(s) shall be within the same calendar
year as scheduled, so long as such revised schedule is consistent with Good
Engineering and Operating Practices and does not, or is not reasonably likely
to, have a material adverse effect on the performance of the Facility; and (ii)
use its reasonable best efforts, consistent with Good Engineering and Operating
Practices, to accommodate any subsequent changes in such 60-Month Schedule
(either delaying or advancing such 60-Month Schedule) reasonably requested by
HELCO in the event that HELCO is experiencing or expecting to experience a 
short-term shortage of supply of energy, capacity or both or any other
operational or electrical problems with HELCO's electrical system, in which case
HELCO shall reimburse SELLER for any net incremental costs of changing the 60-
Month Schedule to accommodate HELCO; provided that SELLER provides written 
                                     -------- ----                
documentation of such net incremental cost and makes a reasonable effort to
include potential savings (for example, an improved heat rate) attributable to
the change in schedule.

        The normal annual maintenance requirements for the Facility are the
equivalent of two (2) weeks of full plant sixty (60) MW outage. Notwithstanding
the foregoing, SELLER shall not take units down for maintenance such that the
capability of the Facility falls below thirty (30) MW at any given time, except
with HELCO's prior approval, which shall not be unreasonably withheld.

     SELLER shall not schedule any maintenance not listed on the 60-Month
Schedule that will reduce or eliminate electric output of the Facility without
coordination with

                                       34
<PAGE>
 
and approval of HELCO, which approval shall not be unreasonably withheld,
delayed or conditioned, and shall use all reasonable efforts to provide HELCO
with as much advance notice as is practicable prior to removing the Facility
from service for such maintenance.  Such removal from service will be treated as
a forced outage if so required under NERC GADS.

     (9) Minimum Load Capability - Subject to the Dispatch Constraints, when on-
line, the Facility shall provide the following net minimum load capability: one
(1) CT, Simple Cycle mode - five (5) MW; one (1) CT, combined cycle mode - seven
(7) MW; two (2) CTs, Simple Cycle mode - ten (10) MW; two (2) CTs, combined
cycle mode - sixteen (16) MW.

     (10) Short Circuit Ratio - The short circuit ratio shall be between 0.4 and
1.0 inclusive.

     (11) Open Circuit Transient Field Time Constant - The open circuit
transient field time constant shall be thirteen (13) seconds or less.

     (12) Generator Step-Up Transformer Impedance - The generator step-up
transformer impedance shall be between seven percent (7%) and nine percent (9%),
inclusive, on transformer OA rating.

     (13) Response Ratio - The excitation system response ratio shall be 1.0 or
higher.

     (14) Ceiling Voltage - The excitation system ceiling voltage shall be one
hundred fifty percent (150%) of rated main generator field voltage.

     (15) Excitation Source Immunity - The excitation source shall be immune to
variations in system voltage.

     (16) Static Regulator - The excitation system shall have a static
regulator.

     (17) Field Forcing Ability - The excitation system shall have field forcing
ability.

     (18) Droop Characteristic - The unit speed-droop characteristic shall have
a nominal setting of five percent (5%) and variable settings between three
percent (3%) and six (6%).

     (19) Over/Under-Speed - The over-speed/under-speed operating capability
shall be +/- 1.5 Hz continuously and +/- 3 Hz for a minimum of six (6) seconds
per occurrence.

     (20) Control Systems - The power source for control systems will be
designed to be immune from system transients in accordance with Section 3.2A(6).

                                       35
<PAGE>
 
     (21) Regulation Capability - The Facility shall be capable of operating in
isochronous or droop mode.

     (22) Capacity Tests - SELLER shall conduct Initial Acceptance Tests for
Phase 1 and Phase 2 and any subsequent Capacity Tests (subject to inspection by
HELCO) in accordance with the testing procedures set forth in "Attachment L" to
determine when Capacity Charge payments should begin or be adjusted in
accordance with Section 5.1B.

     (23) Cycling of the Heat Recovery Steam Generators and the Steam Turbine -
Within the limitations (if any) set forth in the PSD Permit regarding limits on
starts or restarts, the generating units may be shut down and restarted as
requested by HELCO pursuant to HELCO Dispatch; provided that, under normal 
                                               -------- ---- 
(non-emergency) system conditions, neither heat recovery steam generator shall
be shut down and restarted more than an average of once per day during any
Calendar Month and provided, further, that the parties shall
                   --------  -------                        
cooperate and use good faith efforts in seeking to remove such limitations (if
any) set forth in the PSD Permits regarding starts or restarts. If a heat
recovery steam generator is taken off-line and put back on-line within five (5)
hours, such process shall not be deemed a "restart" for purposes of this Section
3.2C(23). If (to the extent permitted under the PSD Permit) HELCO shuts down and
restarts either heat recovery steam generator more than thirty (30) times during
any Calendar Month, HELCO shall pay to SELLER Five Hundred Dollars ($500) (1995
$) (as escalated by the factor of GDPIPD\CURRENT\GDPIPD\BASE\, as described in
"Attachment I") for each restart thereafter during such Calendar Month as
reimbursement for SELLER's start-up costs. Such amounts shall be included by
SELLER in the next Monthly Invoice.

     (24) Startup Periods - The maximum time to full load under normal (non-
emergency) system conditions shall be thirty (30) minutes for warm start-ups and
two (2) hours for cold start-ups. When requested by HELCO under emergency
conditions, SELLER shall use reasonable efforts to accelerate such start-up
periods to the extent the Facility is capable of doing so within manufacturer's
specifications and warranties.

     (25) Ramp Rates - The maximum ramp rate during normal (non-emergency)
system conditions shall be 4.4EMW per minute, per CT up to 22 MW for each CT.
When requested by HELCO under emergency conditions, SELLER shall use reasonable
efforts to maximize such ramp rates to the extent the Facility is capable of
doing so within manufacturer's specifications and warranties.

     (26) QLPU - If one CT is operating in Simple Cycle or combined cycle, the
QLPU for any three (3) second period shall be the lesser of (i) 4.4 MW or (ii)
22.0 MW less the current output of such CT. If both CTs are operating in Simple
Cycle or in combined cycle, the QLPU for any three (3) second period shall be
the lesser of (i) 8.8 MW or (ii) 44.0 MW less the current cumulative output of
such CTs.

     (27) Simple Cycle Operation - During the Phase 1 Period, the Facility
shall run with one (1) CT in Simple Cycle, as requested by HELCO Dispatch.
During the Phase 2 Period,

                                       36
<PAGE>
 
the Facility may be run with one (1) or two (2) CTs in Simple Cycle, as
requested by HELCO Dispatch, subject to the following provisions:

          (i) HELCO and SELLER shall cooperate with each other in good faith to
determine on a month-by-month basis, the extent to which the Facility may be
dispatched by HELCO in Simple Cycle during the remainder of the calendar year,
without jeopardizing the Facility's QF Status (the "Allowed Simple Cycle
Period").  In addition, on a monthly basis, at least one (1) week prior to the
end of the Calendar Month, SELLER shall provide HELCO with a calculation of the
Facility's operating and efficiency standards as set forth in the QF
Requirements based on the Facility's operation during the calendar year up to
that point in time; provided, that, HELCO use such calculations and related
                    --------  ----                                         
information provided to HELCO under this Section only for purposes of
determining the Allowable Simple Cycle Period and shall keep such calculations
and related information confidential and shall not disclose such calculations
and information to any third parties without the prior express written consent
of SELLER.

          (ii) HELCO shall notify SELLER if it intends to request that the
Facility run in Simple Cycle.  Upon receipt of such notice, SELLER shall
promptly provide HELCO with an update of the Allowed Simple Cycle Period (if
any, to the extent agreed by the parties) for the remainder of the calendar year
(in writing or to be confirmed in writing).  In the event that HELCO then
requests that the Facility run in Simple Cycle and the Facility loses its QF
status, HELCO shall indemnify, reimburse and make SELLER whole with respect to
(A) the documented, incremental, reasonable, out of pocket costs and expenses of
such loss of QF status, including the legal costs and other expenses of filings
before federal and state regulatory agencies, if any, up to Fifty Thousand
Dollars ($50,000) and (B) any reduction in the payments SELLER is entitled to
receive pursuant to the order of such agencies or other adverse regulatory
impact on SELLER's economic arrangements with HELCO as set forth in this
Agreement (up to the amounts SELLER would have received under Article V herein),
but only to the extent that SELLER demonstrates that such loss of QF status is
due to Simple Cycle operation requested by HELCO and that the actual number of
Simple Cycle hours the CTs ran exceeded the Allowed Simple Cycle Period for the
remainder of the calendar year; provided, however, the foregoing indemnification
                                --------  -------                               
with respect to clause (B) shall not apply if SELLER shall have received from
the PUC or other applicable federal or state agency a satisfactory order to the
effect that the Facility shall not be subject to rate regulation or any
reduction in the payments SELLER is entitled to receive following any resulting
loss of QF status.

          (iii)  In the event that the Facility loses its QF status as described
in clause (ii) above, HELCO shall cooperate with SELLER in seeking any necessary
regulatory approvals with the intention of preserving the economic arrangements
between the parties set forth herein.

          (iv) For any period during which HELCO requests the Facility to run in
Simple Cycle, HELCO shall indemnify, reimburse and make SELLER whole with
respect to any and all reasonable, documented, incremental, out-of-pocket costs
(such as the incremental costs of providing an alternative source of thermal
energy to the purchaser(s) under the Thermal Energy Sales Contract(s)) expenses,
lost economic benefits (which shall include the difference

                                       37
<PAGE>
 
between revenues under the Thermal Energy Sales Contract(s) and this Agreement
for such incremental energy) or liabilities to third parties under the Thermal
Energy Sales Contract(s) resulting from such Simple Cycle operations, up to a
limit of Five Thousand Dollars ($5,000) per diem for each day that the Facility
runs in simple cycle pursuant to a HELCO request.  Such reimbursement up to
$5,000 per diem shall be subject to an overall limitation on HELCO's annual
liability of Five Hundred Thousand Dollars ($500,000).

          (v)    All requests by SELLER for indemnification or reimbursement
under this Section shall be paid promptly by HELCO, subject to verification.

          (vi)   For purposes of this Section, Simple Cycle operations in
connection with normal startup of the Facility shall not be considered a request
by HELCO that the Facility run in Simple Cycle.

          (vii)  A failure by SELLER to operate the Facility in Simple Cycle at
HELCO's request, as provided herein, shall count against SELLER for purposes of
calculating EAF and EFOR, which shall be HELCO's exclusive remedy in the event
of such failure to operate.

          (viii) In conjunction with the application or motion for approval of
this Agreement, the parties shall petition the PUC for a declaratory order
determining that SELLER will not be deemed to be a "public utility" within the
meaning of Section 269-1, Hawaii Revised Statutes, in the event that HELCO
requests that the Facility run in Simple Cycle, and the Facility loses its QF
status due to Simple Cycle operation requested by HELCO.

  D.  Warranties and Guarantees of Performance
      ----------------------------------------

      (1)  Equivalent Availability Factor - SELLER warrants and guarantees that
the Facility will achieve an EAF of at least the following amounts:

           From the Phase 1 In-Service Date to the End of Phase 2 Start-Up -
85%;

           End of Phase 2 Start-Up to end of Transition Period and all Contract
Years thereafter (except years in which there is a Major Equipment Overhaul) -
90%.

           Years in which there is a Major Equipment Overhaul - 89%.

           If a Force Majeure event(s) and/or a Catastrophic Equipment
Failure(s) occur, the EAF calculation for purposes of computing Liquidated
Damages or Event of Default criteria shall have a reduction to both the
numerator and denominator equal to the number of equivalent full load hours of
the Force Majeure event(s) and/or Catastrophic Equipment Failure(s) which
occurred during the period represented by the calculation.

      (2)  Equivalent Forced Outage Rate - SELLER warrants and guarantees that
the Facility will not exceed an eight percent (8%) EFOR from the Phase 1 In-
Service Date until

                                       38
<PAGE>
 
the End of Phase 2 Start-Up and a four percent (4%) EFOR from the End of Phase 2
Start-Up to the end of the Transition Period, and in each Contract Year
thereafter. If a Force Majeure event(s) and/or a Catastrophic Equipment
Failure(s) occur, the EFOR calculation for purposes of calculating Liquidated
Damages or determining Event of Default criteria shall have a reduction to both
the numerator and denominator equal to the number of equivalent full load hours
of the Force Majeure event(s) and/or Catastrophic Equipment Failure(s) which
occurred during the period represented by the calculation.

     (3)  Firm Capacity - SELLER warrants and guarantees that after the first
twelve (12) months following the Phase 2 In-Service Date, the Facility will have
and maintain the capability to produce and deliver to the Metering Point, in
accordance with the terms of this Agreement, the Firm Capacity.

     (4)  Quality - SELLER warrants and guarantees that the Facility will
produce power that meets the quality standards in Section 3.2C(1), (2), and (3).

     (5)  Unit Trips - SELLER warrants and guarantees that the Unit Trips of the
Facility per annum will not exceed twelve (12) per annum from the Phase 1 In-
Service Date until the End of Phase 2 Start-Up and six (6) per annum from the
End of Phase 2 Start-Up to the end of the Transition Period, and during any
Contract Year thereafter.

     (6)  EXCLUSIVE WARRANTIES - THE FOREGOING WARRANTIES CONSTITUTE THE
EXCLUSIVE WARRANTIES UNDER THIS AGREEMENT AND OPERATE IN LIEU OF ALL OTHER
WARRANTIES, WHETHER ORAL OR WRITTEN. SELLER AND HELCO DISCLAIM ANY OTHER
WARRANTY, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION, WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

 E.  Metering
     --------

     (1)  Meters - HELCO shall purchase and own meters suitable for measuring
the integrated Net Electric Energy Output of the Facility in kW and kWh on a
time of use basis and of reactive power flow in kilovar and kilovarhours. HELCO
will calibrate these devices in accordance with the latest edition of the
American National Standards Institute Code for Electricity Metering. The kilovar
hour meters shall be ratcheted to prevent reversal in the event the power factor
is leading. HELCO shall install, maintain and annually test such meters and
shall be reimbursed by SELLER for all reasonably incurred costs (including
applicable sales taxes) for such installation, maintenance and testing work.
SELLER shall furnish, install and maintain in accordance with HELCO's
requirements and at no charge to HELCO, all conductors, service switches, fuses,
meter sockets and cases, meter and instrument transformers, switchboard meter
test switches, meter panels, steel structures and similar devices required for
service connection and meter installations. HELCO shall install two (2) complete
sets of metering equipment using the same instrument transformers for each
metering station. SELLER may, at
 

                                       39
<PAGE>
 
its own expense, monitor (by electronic means or otherwise) any meters described
in this Section 3.2E(1).

      (2)  Communications, Telemetering and Remote Control Equipment - HELCO
shall purchase, install and own such communications, telemetering and remote
control equipment at the Facility as may reasonably be required in order to
allow HELCO to dispatch the electrical energy from the Facility as required to
optimize economic and reliable operation of HELCO's electrical system. Such
equipment shall meet HELCO's reasonable specifications for transmission of
metered data to locations specified by HELCO. If HELCO installs and maintains
such communications, telemetering and remote control equipment at the Facility,
SELLER shall reimburse HELCO for its reasonable procurement and installation
costs related thereto up to One Hundred Thousand Dollars ($100,000) and
maintenance costs related thereto, which shall be an up front fixed payment of
Eighty-Two Thousand Dollars ($82,000) at the time such equipment is installed.
Subsequent to the initial Facility design, HELCO may purchase and install such
additional communications, telemetering, and remote control equipment and may
require SELLER to install at HELCO's expense, any reasonably necessary
additional transducers, test switches, AC and DC sources, telephone lines and
interconnecting wiring at any time during the Term.

      (3)  Meter Testing - HELCO shall provide at least twenty-four (24) hours
notice to SELLER prior to any test it may perform on the metering or
telemetering equipment. SELLER shall have the right to have a representative
present during each such test. Either party may request additional tests in
addition to the annual test provided for in Section 3.2E(1) and shall pay the
cost of such additional test. If any of the metering equipment is found to be
inaccurate at any time, HELCO shall promptly cause such equipment to be made
accurate, and the period of inaccuracy, as well as the estimate for correct
meter readings, shall be determined in accordance with Section 3.2E(4).

      (4)  Corrections - If any test of metering equipment conducted by HELCO
indicates that its meter readings are in error by one percent (1%) or more, the
meter readings from such equipment shall be corrected as follows: (i) determine
the error by testing the meter at approximately ten percent (10%) of the rated
current (test amperes) specified for the meter; (ii) determine the error by
testing the meter at approximately one hundred percent (100%) of the rated
current (test amperes) specified for the meter; (iii) the average meter error
shall then be computed as the sum of one-fifth (1/5) the error determined in (i)
and four-fifths (4/5) the error determined in (ii). The average meter error
shall be used to adjust the bills for the amount of electric energy supplied to
HELCO for the previous six (6) months from the Facility, unless HELCO's or
SELLER's records conclusively establish that such error existed for a greater or
lesser period, in which case the correction shall cover such actual period of
error, except as specified in Section 6.3.

 F.  Fuel and Other Materials
      ------------------------

     SELLER shall be responsible for acquiring, transporting and storing
adequate supplies of Fuel and other materials used in the operation of the
Facility during the Term. An

                                       40
<PAGE>
 
adequate supply of Fuel under normal conditions shall, at a minimum, include at
least a twenty-four (24) day reserve on the Site, which shall be determined by
SELLER in good faith based upon (i) the average level of HELCO Dispatch during
the previous six (6) months and (ii) the expected level of HELCO Dispatch during
the following month as indicated by HELCO.  In the event either SELLER or HELCO
has available excess Fuel which is not necessary for operations, and the other
party is experiencing a fuel shortage, the parties shall, to the extent
possible, cooperate on a temporary, emergency basis, by making available such
excess Fuel to the other upon such party's request, subject to full
reimbursement for all costs.

  G.  Waste Handling
      --------------

      SELLER shall be responsible for the handling and proper disposal of any
waste products produced by the Facility, including but not limited to waste
water and ash, or for any costs associated therewith.

  H.  Emissions
      ---------

      SELLER shall be responsible for the control and consequences of any and
all emissions produced as a result of operation of the Facility and for all
costs associated therewith.

  I.  Compliance with Laws
      --------------------

      SELLER shall at all times comply with all valid and applicable federal,
state and local laws, rules, regulations, orders, permit conditions and other
governmental actions (where non-compliance may materially adversely impact
SELLER's performance under this Agreement) and shall be responsible for all
costs associated therewith.

  J.  Adequate Spare Parts
      --------------------

      SELLER shall at all times keep on hand or have ready access to sufficient
spare parts to maintain the Facility in a manner which provides reasonable
assurance, consistent with Good Engineering and Operating Practices, that the
warranted performance of the Facility will be achieved.  SELLER agrees to budget
and maintain at least Five Hundred Thousand Dollars ($500,000) (1998$) worth (as
escalated by the factor of GDPIPD\CURRENT\GDPIPD\BASE\, as described in
"Attachment I") of such spare parts for the Facility.


  K.  Periodic Meetings
      -----------------

      The General Manager or an alternate satisfactory to HELCO shall attend
periodic meetings with appropriate HELCO representatives and be prepared to
discuss Facility operations and maintenance and interface with HELCO's
electrical system operations.  Such meetings may be regularly scheduled or
called specifically to address particular problem areas.

                                       41
<PAGE>
 
  L.  Maintenance of Qualifying Facility (QF) Status
      ----------------------------------------------

      SELLER shall use its reasonable best efforts to be in compliance with the
criteria for qualifying cogeneration facilities as set forth in HAR Sections 6-
74-6 and 6-74-7 and 18 CFR Sections 292.205 and 292.206 (the "QF Requirements")
following the Phase 2 In-Service Date, except to the extent HELCO requests that
the Facility operate in a manner that would jeopardize its QF status (e.g.,
extended Simple Cycle operation).  SELLER shall certify its compliance with the
QF Requirements to HELCO each year (if applicable).  Loss or forfeiture of QF
status shall not affect the prices set forth in Article V or the parties'
obligations hereunder; provided that, (i) upon the loss or forfeiture of QF
                       -------------                                       
status for reasons other than resulting from HELCO Dispatch, SELLER shall
promptly seek FERC certification (if applicable) as an EWG under the Energy
Policy Act of 1992; (ii) if, as a result of SELLER's loss or forfeiture of QF
status, SELLER is able to deliver additional capacity to HELCO above the Firm
Capacity, such additional capacity shall be offered to HELCO and HELCO shall
have the option to purchase such additional capacity at a discount of twenty-
five percent (25%) from the Capacity Rates set forth in Article V; and (iii) if,
as a result of SELLER's loss or forfeiture of QF status, SELLER is able to
realize cost savings resulting from a reduction or elimination of thermal energy
deliveries, SELLER shall provide HELCO with a monthly rebate of fifty percent
(50%) of such savings realized by SELLER.  Except with respect to HELCO's
indemnification obligations as provided for in Section 3.2C(27) and this Section
3.2L, any change in the QF status of the Facility after the Execution Date shall
not affect either party's obligations under this Agreement.

  M.  Notice of Certain Events
      ------------------------

      To the extent any of the following events occur and could reasonably be
likely to have a material adverse effect on SELLER's performance under this
Agreement, SELLER shall provide HELCO with notice of the occurrence of such
event and SELLER's proposed measures to ensure that such event will not lead to
an Event of Default or otherwise materially impair SELLER's ability to perform
its obligations under this Agreement:

      (1)  SELLER shall fail to comply with any provision with respect to any
obligations for borrowed money in excess of One Million Dollars ($1,000,000) if
the effect of such failure to comply is to cause, or to permit the holder or
holders of such obligations (or a trustee on their behalf), to cause such
obligations to become due prior to their stated maturity, except to the extent
that such failure to comply shall have been cured or waived prior to any
acceleration of such obligations thereunder and said cure or waiver shall not
have involved the receipt by any such holder or holders of any additional
consideration, financial or otherwise.

     (2)  Any final order, judgment or decree is entered in any proceeding,
which final order, judgment or decree provides for the payment of money in
excess of One Hundred Thousand Dollars ($100,000) by SELLER, and SELLER shall
not discharge the same or provide for its discharge in accordance with its
terms, or procure a stay of execution thereon within sixty (60) days from the
entry thereof, and within such period of sixty (60) days, or such longer period
during which execution on such judgment shall have been stayed, appeal therefrom
and cause the execution thereof to be stayed during such appeal.

                                       42
<PAGE>
 
     (3)  SELLER shall fail to make any payment for materials or labor used in
the engineering, design, construction, maintenance or operation of the Facility
within ninety (90) days after the due date thereof, except for payment
obligations contested in good faith by SELLER or adequately bonded to the
reasonable satisfaction of HELCO or contract retentions withheld during SELLER's
review of a contractor's performance.

     (4)  The Financing Parties shall declare an event of default under the
Financing Documents.

     (5)  SELLER shall have received any notice that it is not in compliance
with any of the applicable permits that enable SELLER to operate the Facility
and SELLER has not obtained a consent decree or equivalent agreement to allow
the continued lawful operation of the Facility.

  N.  Labor Disputes
      --------------

      If, after the Phase 2 In-Service Date, SELLER experiences a work stoppage,
work slowdown or walkout as a result of a labor dispute with its employees, or
between any entity with which SELLER has subcontracted operational
responsibility and the employees of such entity, SELLER shall provide an
adequate, qualified workforce to operate and maintain the Facility within
seventy-two (72) hours after such stoppage, slowdown or walkout begins.  If
SELLER fails to meet this obligation, it shall pay to HELCO the sum of Seven
Thousand Five Hundred Dollars ($7,500) for each day or partial day during which
such adequate, qualified workforce is not provided and there is a reduction in
output below the level called for by normal HELCO Dispatch, up to a maximum
period of fourteen (14) days.  SELLER shall provide prompt written notice to
HELCO as to the date and time at which it has met this obligation.  If, at any
time after the aforesaid seventy-two (72) hour period has expired, but during
the continuation of the SELLER work stoppage, slowdown or walkout, the Facility
is experiencing a reduction in output below the level called for by normal HELCO
Dispatch, (i) it shall be presumed that such reduction is the result of a lack
of an adequate, qualified workforce unless SELLER reasonably demonstrates that
such reduction is attributable to other causes, and (ii) the Seven Thousand Five
Hundred Dollar ($7,500) payment shall apply as set forth above and such payment
shall constitute HELCO's sole remedy for a continued labor dispute.

3.3  Rights and Obligations of HELCO
     -------------------------------

     A.  Dispatch of Facility Power
         --------------------------

         (1)  Routine Dispatch - HELCO shall have the right to dispatch capacity
and real and reactive power delivered from the Facility to its system as it
deems appropriate in its reasonable discretion, subject only to and consistent
with Good Engineering and Operating Practices, the Dispatch Constraints set
forth in Section 3.2C of this Agreement and SELLER's maintenance schedule
determined in accordance with Section 3.2C(8). HELCO Dispatch will either be by
SELLER's manual control under the direction of HELCO's System Operator or by

                                       43
<PAGE>
 
computerized control by HELCO's Energy Management System (to the extent HELCO
may utilize computerized control now or at a future date) in each case at
HELCO's reasonable discretion. Unless otherwise agreed to, HELCO may request the
maximum real power output at 0.85 lagging power factor from the Facility, but
shall not reduce the load on the Facility below those standards specified in
Section 3.2C(9) for each operating configuration. Refusal to comply with HELCO
Dispatch shall result in an unreported derating, which shall be measured as the
shortfall (if any) in the amount of electricity delivered by the Facility from
the amount of electricity requested by HELCO Dispatch, from the time such
dispatch request was received until such time as SELLER complies with such
dispatch request. Upon request by SELLER, HELCO shall demonstrate that such
dispatch instructions or signals were given to SELLER to accomplish the request
made by HELCO Dispatch. SELLER shall utilize the full capability of the Facility
to satisfy its obligation to deliver Firm Capacity in accordance with HELCO
Dispatch by taking necessary actions, including but not limited to, the
reduction or elimination of steam delivery to the thermal host.

          (2) Demonstration of Loading and Unloading Ramp Rates - HELCO shall
have the right at any time, other than during start-up periods, maintenance or
other outages, upon reasonable notice with "cause," to direct the Facility to
demonstrate its ability to meet the maximum ramp rate specified in
Section 3.2C(25).  For purposes of this Section 3.3A(2), "cause" shall mean the
failure of the Facility to meet the required loading or unloading ramp rates
specified in accordance with HELCO Dispatch by HELCO's System Operator.  A one
(1) hour notice will be given to SELLER prior to the initial ramp rate test,
which shall be performed by HELCO's System Operator testing the Facility by
increasing or decreasing load at the maximum ramp rate.  If the Facility passes
the initial ramp rate test, subsequent ramp tests may be conducted by HELCO from
that time to the end of the next weekend upon notice by telephone no less than
five (5) minutes prior to commencement of each such test.  If the Facility is
unable to achieve either the loading (increasing) ramp rate or the unloading
(decreasing) ramp rate, this event shall be considered a ramp derating in the
amount of the difference between the Facility's load at the conclusion of the
test and the load the Facility should have achieved in accordance with the
maximum ramp rate.  This ramp derating will be assumed to start at the end of
the test and will end at the earlier of (i) when the Facility demonstrates that
the maximum loading and/or unloading ramp rate has been restored or (ii) when
SELLER declares to HELCO that the Facility is ready to be tested again (if the
Facility subsequently passes such test); provided that, if SELLER takes an
                                         -------------                    
outage during such ramp derating period, no ramp derating penalty shall apply
against SELLER for such outage period.  The ramp derating period shall not count
for purposes of calculating EAF or EFOR until SELLER declares an outage pursuant
to this Section 3.3A(2), in which event, such outage shall count against EAF and
EFOR, as applicable, starting from the earlier of the time SELLER declares such
outage.  Notwithstanding anything herein to the contrary, SELLER's total
liability for any ramp derating hereunder shall not exceed Five Thousand Dollars
($5,000) during any calendar week or Two Hundred Fifty Thousand Dollars
($250,000) during any twelve (12) month period.  In the event SELLER's total
liability for any ramp derating hereunder exceeds One Hundred Fifty Thousand
Dollars ($150,000) during any calendar year, such excess shall be deposited into
the Maintenance Account and shall be disbursed in accordance with the provisions
of Section 8.3.

                                       44
<PAGE>
 
     (3)  Dispatch Notices - HELCO shall provide SELLER with: (i) the Annual
Dispatch Notice no later than sixty (60) days prior to the anticipated Phase 1
In-Service Date for the first Contract Year, and prior to September 1 for each
Contract Year thereafter; and (ii) the Weekly Unit Commitment Schedule no later
than Friday, 12:00 noon, Hawaii Standard Time of each week. HELCO's failure to
comply with the foregoing notice provisions shall not affect HELCO's right to
dispatch the Facility pursuant to this Section 3.3A.

  B.  HELCO Right to Buyout
      ---------------------

      (1)  General - At any time up until the Phase 1 In-Service Date, if HELCO
reasonably determines that it no longer needs the capacity addition provided by
the Facility, HELCO may choose to buyout this Agreement by giving SELLER written
notice of its decision. Promptly upon receipt of such notice, SELLER shall take
steps to cease all construction activity and proceed to take such steps as may
be necessary to mitigate the losses due to such election. SELLER shall use its
best efforts to salvage the value of any equipment or materials purchased or
contracts signed for the Facility and the Interconnection Facilities. All such
mitigation efforts shall be made in consultation with HELCO and shall cease
(unless continued by HELCO as described below) one hundred and eighty (180) days
after receipt of the buyout notice from HELCO (the "Salvage Period"). Upon the
earlier of completion of all such mitigation efforts or the end of the Salvage
Period, SELLER shall render an accounting to HELCO showing in detail: (i) the
"Project Costs Incurred" up to the Settlement Date (as defined below),
including estimated costs for the period from the date of such accounting to the
Settlement Date, which shall be the aggregate amount expended or incurred by
SELLER (or affiliates thereof) with regard to the acquisition, development and
construction of the Facility and the Interconnection Facilities and the
financing thereof, including without limitation (and without duplication) all
amounts paid or payable with regard to the construction contract, Site
preparation, interconnect and start-up costs, materials and equipment, fuel
inventory, insurance, taxes, project development fees and expenses, construction
management expenses and fees, fees or penalties, charges, costs or expenses
under all Project Documents, all SELLER debt for financing the Facility and the
Interconnection Facilities (including without limitation, principal, interest,
fees, premiums, defeasance costs and penalties relating thereto), equity funds,
if any, invested in the Project (including without limitation, fees, premiums
and penalties relating thereto), fees and expenses incurred in arranging
financing for the Facility and attorneys' fees and disbursements, but excluding
fees to Guarantor(s) for providing the Guarantee(s) except to the extent such
fees would normally be payable in an arms' length transaction, and (ii) the "Net
Salvage Proceeds" which shall be the aggregate amount of proceeds received from
the salvage efforts described above, less costs and expenses incurred in such
efforts. After the accounting is rendered, HELCO shall have sixty (60) days (the
"Audit Period") to audit such accounting only to verify that Project Costs
Incurred were, in fact, incurred in direct relation to the Facility and the
Interconnection Facilities and that Net Salvage Proceeds, in fact, reflect such
net proceeds. Upon the later of thirty (30) days after the end of the Audit
Period or satisfactory completion of the requirements of Section 3.3B(2) (the
"Settlement Date"), HELCO shall pay to SELLER the sum of (X) Project Costs
Incurred, where estimated amounts included in SELLER's accounting shall be
replaced with actual amounts incurred or expended as reported to and verified by
HELCO, plus (Y) the Buyout Payment (as defined below), minus (Z) Net Salvage
Proceeds. For purposes
 

                                       45
<PAGE>
 
of this Agreement, the "Buyout Payment" shall be determined according to the
following schedule, depending upon the date upon which the buyout notice is
received.
 
      On or before the PUC Approval Date             $ 5,000,000
 
      On or before the Closing Date                  $ 8,000,000
 
      On or before the Phase 1 In-Service Date       $10,000,000

      In the event mitigation efforts are not completed by the end of the
Salvage Period, HELCO may at its own expense continue such efforts and retain
the proceeds thereof. Once the payment to be made on the Settlement Date is made
in full, this Agreement shall be deemed canceled and the parties shall have no
further obligations hereunder.

      (2)  Ownership of Unsalvageable Items - Upon termination of the Audit
Period, SELLER, at HELCO's request, shall promptly take all actions as may be
necessary (a) to convey to HELCO free and clear of all liens and encumbrances
(other than those of HELCO and the Financing Parties) all of SELLER's right,
title and interest in the Facility and to the Interconnection Facilities and any
and all materials, equipment, design materials and supplies relating to the
Facility and to the Interconnection Facilities, including without limitation,
any such materials, equipment, design materials or supplies located at the Site
or in transit to the Site, whether or not completed or ready for use or
incorporated into the Facility and to the Interconnection Facilities, and any
such materials, equipment, design materials or supplies being processed,
fabricated, assembled or prepared off the Site for installation in the Facility
or the Interconnection Facilities or for use at or in connection with the
Facility or the Interconnection Facilities, and (b) to assign to HELCO, with
such consents and undertakings as may be necessary to make such assignments
fully effective, the Project Documents. SELLER shall use reasonable efforts to
assure that it has sufficient rights with respect to materials, equipment,
design materials and supplies purchased or contracted for by SELLER, and
sufficient rights under all leases and contracts relating to Facility and the
Interconnection Facilities, to enable SELLER to comply with its obligations
pursuant to this Section 3.3B(2). In the event of such assignment, HELCO shall
assume, as of the Settlement Date, all of SELLER's right, title, interest and
obligations in the foregoing materials, equipment, design materials, supplies
and Project Documents and SELLER shall be fully discharged from such
obligations.

  C.  HELCO Right to Defer
      --------------------

      (1)  Prior to the PUC Approval Date - At any time up until the PUC
Approval Date, HELCO may once choose to defer the Phase 1 In-Service Date and
the Phase 2 In-Service Date by up to eighteen (18) months beyond the then
expected Phase 1 In-Service Date Deadline and Phase 2 In-Service Date Deadline,
as applicable, by giving SELLER sixty (60) days written notice of its decision
to defer and the extent of the deferral period, which shall commence at the end
of such sixty (60) day period. Upon the written request (and at the expense) of
HELCO given not more often than once in any six (6) month period and before a
deferral notice under this Section 3.3C(1) has been given, SELLER shall within
forty-five (45) days provide an

                                       46
<PAGE>
 
estimate ("Pre-Deferral Estimate") of the anticipated costs (to the extent then
known by SELLER) to be paid by HELCO under this Section 3.3C(1) if a deferral
notice were given at or about the time of such request. Consistent with the
obligation set forth below to minimize such costs during the deferral period,
SELLER shall take such steps as it reasonably deems necessary to assure the
timely occurrence of the Phase 1 In-Service Date and the Phase 2 In-Service Date
(as either or both may be so deferred), including obtaining or renewing
applicable permits, contracts, rights or properties, and HELCO shall cooperate
with SELLER in such efforts. Upon the commencement of the deferral period,
SELLER shall take such steps as may be reasonably necessary to minimize out-of-
pocket costs of the parties interested in participating in the Facility
(including parties acting as suppliers of goods, services, financing or
otherwise) which result from such deferral, excluding from such obligation to
minimize, however, deferral fees, penalties or similar charges by such parties
which have been agreed upon (and notice of which has been given to HELCO or
included in any Pre-Deferral Estimate). HELCO shall bear all additional costs
("Deferral Costs") incurred by SELLER with respect to the Facility of each type
includable in Project Costs Incurred which result from a deferral. SELLER shall,
on a monthly basis, provide HELCO with an accounting of all Deferral Costs
incurred by SELLER and then payable. HELCO shall pay to SELLER all Deferral
Costs, together with a monthly deferral fee (the "Deferral Fee") equal to Fifty
Thousand Dollars ($50,000) within thirty (30) days of such accounting.

     (2)  Prior to the Closing Date - At any time after the PUC Approval Date
and prior to the Closing Date, HELCO may, by giving SELLER sixty (60) days
written notice of its decision to defer and the extent of the deferral period,
which shall commence at the end of such sixty (60) day period, once request that
the Phase 1 In-Service Date or Phase 2 In-Service Date, or both, be deferred
beyond the then expected Phase 1 In-Service Date or Phase 2 In-Service Date, as
applicable, by up to twelve (12) months (less the number of months of the
deferral period, if any, elected under Section 3.3C(1) above). Upon the written
request (and at the expense) of HELCO given not more often than once in any six
(6) month period and before a deferral notice under this Section 3.3C(2) has
been given, SELLER shall within forty-five (45) days provide a Pre-Deferral
Estimate with respect to the anticipated costs (to the extent then known by
SELLER) to be paid by HELCO under this Section 3.3C(2) if a deferral notice were
given at or about the time of such request. Upon receiving a deferral request
from HELCO in writing, SELLER and HELCO shall immediately commence consulting
between themselves and among all the parties interested in the Facility, whether
as suppliers of goods, services or financing or otherwise, with the intent of
obtaining the consent of all such parties to such deferral on terms and
conditions satisfactory to each of them, HELCO and SELLER. Such consultations
shall continue until the earlier of (i) the commencement of such deferral only
upon terms and conditions agreed upon by all the parties interested in the
Facility or (ii) sixty (60) days after the giving of the deferral request by
HELCO (the "Consultation Period"). During the Consultation Period, SELLER may
continue to proceed towards reaching the Phase 1 In-Service Date and Phase 2 In-
Service Date, as applicable, without taking into account the proposed deferral.
HELCO shall bear all (i) reasonable additional out-of-pocket costs of SELLER and
the other interested parties incurred during the Consultation Period as a result
of such consultations; (ii) all Deferral Costs incurred by SELLER which result
from the deferral, if implemented. SELLER shall, on a monthly basis, provide
HELCO with an accounting of such out-of-pocket costs and

                                       47
<PAGE>
 
Deferral Costs incurred by SELLER and then payable. HELCO shall pay to SELLER
all such costs together with the Deferral Fee (which shall be increased to
Seventy-Five Thousand Dollars ($75,000) per month following the PUC Approval
Date) within thirty (30) days of each such accounting.

    (3)  On or After the Closing Date and Prior to Phase I In-Service Date - At
any time on or after the Closing Date and prior to the Phase 1 In-Service Date,
HELCO may, by giving SELLER sixty (60) days written notice of its decision to
defer and the extent of the deferral period, which shall commence at the end of
such sixty (60) day period, once request that the Phase 1 In-Service Date or
Phase 2 In-Service Date, or both, be deferred beyond the then expected Phase 1
In-Service Date or Phase 2 In-Service Date, as applicable, by up to twelve (12)
months (less the number of months of the deferral period, if any, elected under
Sections 3.3C(1) or 3.3C(2) above). Upon the written request (and at the
expense) of HELCO given not more often than once in any six (6) month period and
before a deferral notice under this Section 3.3C(3) has been given, SELLER shall
within forty-five (45) days provide a Pre-Deferral Estimate with respect to the
anticipated costs (to the extent then known by SELLER) to be paid by HELCO under
this Section 3.3C(3) if a deferral notice were given at or about the time of
such request. Upon receiving a deferral request from HELCO in writing, SELLER
and HELCO shall immediately commence consulting between themselves and among all
the parties interested in the Facility, whether as suppliers of goods, services
or financing or otherwise, with the intent of obtaining the consent of all such
parties to such deferral on terms and conditions satisfactory to each of them,
HELCO and SELLER. Such consultations shall continue for the Consultation Period.
During the Consultation Period, SELLER may continue to proceed towards reaching
the Phase 1 In-Service Date and Phase 2 In-Service Date, as applicable, without
taking into account the proposed deferral. HELCO shall bear all (i) additional
out-of-pocket costs of SELLER and the other interested parties incurred during
the Consultation Period as a result of such consultations; (ii) all Deferral
Costs incurred by SELLER which result from the deferral, if implemented. SELLER
shall, on a monthly basis, provide HELCO with an accounting of such out-of-
pocket costs and Deferral Costs incurred by SELLER and then payable. HELCO shall
pay to SELLER all such costs together with the Deferral Fee (which shall be
increased to One Hundred Fifty Thousand Dollars ($150,000) per month on or after
the Closing Date) within thirty (30) days of each such accounting.

     (4)  Adjustments to Times - Any deferral under Section 3.3C(1) or (2) shall
result in each Milestone Date, In-Service Date Deadline or other deadline in
this Agreement and the Guarantee(s) (including time milestones reflecting limits
of liability in the Guarantee(s)) by which performance of SELLER is measured or
affected to be deferred by a period equal to the duration of the actual delay
(as mutually agreed upon by HELCO and SELLER) incurred by SELLER as a result of
such deferral, plus any additional period of time as is reasonably necessary to
equitably reflect SELLER's need to cease and restart efforts, as established by
documentary evidence, related to such Milestone Date, In-Service Date Deadline,
or other deadline, which additional period shall not be less than ninety (90)
days. Any obligation of SELLER under this Agreement shall be excused to the
extent and for the period that its inability to perform results from the actual
delay it incurs as a result of any deferral under Section 3.3C(1) or (2).

                                       48
<PAGE>
 
     (5)  Benefits to Others - All obligations of HELCO to make payments under
Sections 3.3C(1) or (2) or Section 3.3B shall accrue (without duplication) to
the benefit of SELLER and each other party to which such payment would in turn
be made by SELLER.

     (6) No Material Adverse Impact - Notwithstanding anything in this
Section 3.3C to the contrary, HELCO's right to defer the Phase 1 In-Service Date
or the Phase 2 In-Service Date shall be limited to that extent that SELLER
reasonably demonstrates that such deferral would have a material adverse effect
on SELLER's ability to develop and finance the Facility on such deferred basis,
including without limitation, SELLER's ability to obtain or maintain any permit,
to meet a Milestone Date or In-Service Date in the future (as re-set in
accordance with this Section for such deferral) or to utilize special purpose
revenue bonds (if any) which are designated, authorized, or allocated to SELLER
for use in connection with the financing of Facility.  In the event SELLER
reasonably demonstrates that HELCO's deferral request under this Section would
cause such material adverse effect, SELLER shall use reasonable good faith
efforts to mitigate or eliminate the cause of the material adverse effect, which
may include re-applying for or obtaining modifications to permits or financing
arrangements; provided that (i) HELCO shall reimburse SELLER for its costs in
              -------- ----                                                  
connection with such efforts, (ii) HELCO shall cooperate and assist SELLER with
such efforts to the extent requested by SELLER, and (iii) SELLER shall not be
required to re-apply for or seek modification of any permit or financing if
SELLER reasonably demonstrates that such process would subject the Facility to
material delays, interference or increased costs not borne by HELCO.

          (7) Impact on PSD Permit - In the event that, pursuant to the terms of
this Section 3.3C(7), SELLER shall not be required to re-apply for or obtain
modifications to the PSD Permit, HELCO's right to defer the Phase 1 In-Service
Date or the Phase 2 In-Service Date shall be given effect to the extent possible
under such PSD Permit then in effect.  Notwithstanding anything contained herein
to the contrary, HELCO shall not exercise its deferral rights in a manner or to
the extent that would jeopardize PUC approval of this Agreement or the rates to
be paid by HELCO for capacity or energy contained herein.

          (8) Changed Circumstances - In the event HELCO exercises its deferral
rights under this Agreement and there subsequently occurs or is reasonably
likely to occur, by the passage of time, a change in law or a change in
circumstance beyond SELLER's control (e.g. interest rate changes), which would
cause a material adverse impact on the development schedule or economics of the
Facility, then either the deferral period shall be shortened so as to prevent
such material adverse effect or HELCO shall reimburse SELLER for the costs and
expenses, including lost economic benefits directly related to such material
adverse effect, associated with exercising such deferral right; provided that,
                                                                ------------- 
in such event, SELLER shall use reasonable good faith efforts to mitigate or
eliminate the cause of the material adverse impact, which may include re-
applying for or obtaining modifications to permits or financing arrangements,
subject to (i) SELLER's

                                       49
<PAGE>
 
right to reimbursement from HELCO for its costs in connection with such efforts,
(ii) HELCO's obligation to cooperate and assist SELLER with such efforts to the
extent requested by SELLER, and (iii) SELLER's right to refuse to re-apply for
or seek modification of any permit or financing if it reasonably demonstrates
that such process would subject the Facility to material delays, interference or
increased costs not borne by HELCO.

  D.  HELCO Right to Require Independent Engineering Assessment
      ---------------------------------------------------------

     (1) Implementation of Independent Engineering Assessment - If (A) HELCO has
"reasonable cause" to believe that SELLER is failing to operate or maintain the
Facility in accordance with Good Engineering and Operating Practices and that
such failure is likely to result in a failure to meet the performance standards
set forth in Section 3.2C, (B) SELLER is in breach of this Agreement with
respect to the performance or operation of the Facility and has not cured such
breach within the time limits specified in Article VII; or (C) if otherwise
required by Article VII, HELCO may require that the practices in question be
assessed by a qualified professional engineering firm to be chosen from the
Qualified Independent Engineers List attached to this Agreement as "Attachment
H" and revised from time to time under Section 3.3D(2). For purposes of this
Section 3.3D(1), "reasonable cause" shall mean SELLER's failure to operate the
Facility in accordance with Section(s) 2.1D, 3.2A(6), 3.2B(1-3) and 3.2C(1-4, 9-
21, 24-26), which HELCO brings to SELLER's attention and which SELLER fails to
remedy in accordance with Good Engineering and Operating Practices within ninety
(90) days thereafter. The parties shall promptly undertake to agree on a firm to
be used from the Qualified Independent Engineers List; provided, however, that
                                                       --------  -------
if such agreement is not reached within seven (7) days after HELCO gives notice
to SELLER that it is invoking its rights under this Section 3.3D, the firm shall
be chosen from the Qualified Independent Engineers List by HELCO. The
engineering firm selected shall make its determination (an "Independent
Engineering Assessment") as to whether the practices in question conform to Good
Engineering and Operating Practices as promptly as possible under the
circumstances. If such determination is that the practices in question do not so
conform, the engineering firm shall recommend necessary actions by SELLER to
bring it within Good Engineering and Operating Practices. If the engineering
firm's recommendation requires action by SELLER to change its practices, SELLER
shall take such actions. Where action by SELLER has been recommended, the
engineering firm shall determine, after reasonable consultation with SELLER
within thirty (30) days (or such longer period as deemed appropriate by such
engineering firm) after its recommendation is first made, whether SELLER has
taken adequate action to carry out such recommendation. If the engineering firm
then certifies that SELLER has failed to take adequate action, HELCO shall
notify SELLER and the Financing Parties in writing of such certification and the
basis therefor. Such notice shall state in bold letters that failure to respond
adequately can lead to termination of this Agreement within thirty (30) days. If
within thirty (30) days of such actual written notice to SELLER and the
Financing Parties, neither has begun to implement such recommendation, such
failure shall be an Event of Default. If within such thirty (30) day period
SELLER or any Financing Party does begin to implement such recommendation, the
engineering firm shall monitor whether the implementation thereof is being
diligently pursued. If, after reasonable consultation with the parties involved
in such implementation, the

                                       50
<PAGE>
 
engineering firm determines that such implementation is not being diligently
pursued, it shall promptly so certify to HELCO. HELCO shall thereupon promptly
notify SELLER and the Financing Parties in writing of such certification and the
basis therefor (the "Second Notice"). Such Second Notice shall state in bold
letters that failure to respond adequately can lead to termination of this
Agreement after thirty (30) days. If at any time after the thirty (30) day
period commencing with receipt of the Second Notice by SELLER and the Financing
Parties, the engineering firm again certifies to HELCO that implementation of
its recommendation is not being diligently pursued, such certification shall
constitute an Event of Default by SELLER. SELLER shall bear all costs of the
engineering firm's services unless the firm's initial recommendation is that the
practices in question were in accordance with Good Engineering and Operating
Practices, in which case HELCO shall bear all costs of the engineering firm"s
services.

     (2) Qualified Independent Engineers List - The Qualified Independent
Engineers List attached hereto as "Attachment H" contains the names of
engineering firms which both parties agree are fully qualified to perform the
Independent Engineering Assessment under Section 3.3D(1). At any time, except
when an Independent Engineering Assessment is being made under Section 3.3D(1),
either party may remove a particular engineer from the Qualified Independent
Engineers List by giving written notice of such removal to the other party.
However, neither party may remove a name or names from the Qualified Independent
Engineers List without approval of the other party if such removal would leave
the Qualified Independent Engineers List without any names. During January of
each year, both parties shall review the current Qualified Independent Engineers
List and give notice to the other party of any proposed additions to the
Qualified Independent Engineers List and any intended deletions. Intended
deletions shall be effective upon receipt of notice by the other party, provided
                                                                        --------
that such deletions do not leave the Qualified Independent Engineers List
- ----
without any names. Proposed additions to the Qualified Independent Engineers
List shall automatically become effective thirty (30) days after notice is
received by the other party unless written objection is made by such other party
within said thirty (30) days. By mutual agreement between the parties, a new
name or names may be added to the Qualified Independent Engineers List at any
time.


               ARTICLE IV - SUSPENSION OR REDUCTION OF DELIVERIES

4.1  Initiation by HELCO
     -------------------


     In the event that HELCO determines and notifies SELLER that a condition
exists in the Facility which has a material adverse physical impact on HELCO's
electrical system or the equipment of HELCO's customers and which, in HELCO's
sole judgment, requires a change in electricity deliveries by SELLER, SELLER
shall immediately suspend or reduce electricity deliveries as requested by
HELCO's System Operator upon oral or written notice, as appropriate, to the
extent required to eliminate such adverse impact. If HELCO's System Operator
determines that an immediate danger to personnel or equipment exists, HELCO's
System Operator may remotely separate the Facility from HELCO's electrical
system by tripping the Facility's synchronizing breakers via the Energy
Management System without prior notice.

                                       51
<PAGE>
 
  A.  Facility Problems
      -----------------

  If the operation of the Facility is causing or substantially contributing to
an adverse condition described in Section 4.1 due to the failure to meet the
requirements of Section 2.1D, 3.2B(1), (2), or (3), or Good Engineering and
Operating Practices, SELLER shall, at its own cost, modify its electric
equipment or operations to the extent necessary to promptly resume full
deliveries of electricity at the quality of electric service required.  Upon
SELLER's reasonable request, HELCO will modify its electrical system to assist
SELLER in resuming full deliveries, provided that SELLER reimburses HELCO for
                                    -------- ----                            
all costs and expenses incurred by HELCO in making such modifications.


  HELCO and SELLER shall use all reasonable efforts to minimize the frequency
and duration of any such conditions and shall seek to promptly restore full
deliveries of electricity in accordance with the terms of this Agreement.

  B.  HELCO System Problem
      --------------------

  In the event that a system emergency, safety problem, forced outage or period
of unscheduled maintenance on HELCO's electrical system which cannot reasonably
be coordinated with SELLER's period of maintenance or shutdown is the cause of
an adverse condition described in this Section 4.1, HELCO shall use all
reasonable efforts to limit the duration of any such occurrence or take other
appropriate action so that full deliveries of electricity by SELLER can be
restored as soon as practicable.  If HELCO suspends or reduces deliveries from
the Facility pursuant to this Section 4.1B it shall, as soon as practicable,
provide a written statement to SELLER setting forth the reasons for such
suspension or reduction requests and the likely duration thereof.

4.2  No Obligation to Accept Energy
     ------------------------------

  A.  During periods in which SELLER has reduced or suspended deliveries of
electricity as requested by HELCO or if the Facility has been separated from
HELCO's electrical system pursuant to Section 4.1 in circumstances described in
Section 4.1A, HELCO shall have no obligation to accept any energy which might
otherwise have been received from the Facility during such period, and HELCO
shall have no obligation to pay for energy which otherwise would have been
available or received from the Facility during such period, and the Facility
shall be considered unavailable during such period for purposes of calculating
SELLER's EAF or other performance standards.

  B.  During periods in which SELLER has reduced or suspended deliveries of
electricity as requested by HELCO pursuant to Section 4.1, in circumstances
described in Section 4.1B, HELCO shall have no obligation to accept any energy
which otherwise would have been received from the Facility during such period.
However, HELCO shall pay for energy (to the extent accepted) in accordance with
Section 5.1, and the duration of the period of separation will not be counted
against SELLER's EAF or EFOR or for the purpose of calculating any other
performance standard.

                                       52
<PAGE>
 
  C.  SELLER shall be paid the Capacity Charge regardless of whether SELLER has
reduced or suspended deliveries of electricity pursuant to Section 4.1, in
circumstances described in either Section 4.1A or Section 4.1B.

4.3  Initiation by SELLER
     --------------------

  If SELLER suspends, or can reasonably anticipate the need to suspend or
substantially reduce, deliveries of electricity below the level called for by
HELCO Dispatch pursuant to Section 3.3A for any reason other than a request by
HELCO pursuant to Section 4.1B, it shall provide immediate oral notice and
subsequent written notice to HELCO as soon as practicable, containing a
reasonably detailed statement of the reasons for such suspension or reduction
and the likely duration thereof.  SELLER shall use its reasonable best efforts
to restore full deliveries of electricity as soon as practicable.

                         ARTICLE V - RATES FOR PURCHASE

5.1  Capacity and Energy Purchased by HELCO
     --------------------------------------

  Subject to the other provisions of this Agreement, HELCO shall accept and pay
for electrical energy generated by the Facility and delivered to HELCO and shall
make capacity payments to SELLER as set forth herein.  Electrical energy and
capacity (demand) shall be metered in accordance with Section 3.2E and such
metering shall constitute the official and legal measurements for any payments
hereunder.

  Prior to the Phase 1 In-Service Date and the Phase 2 In-Service Date, HELCO
will use its reasonable best efforts to accept energy from the Facility during
the testing of each of the generation units.  SELLER shall provide to HELCO a
written, detailed, and comprehensive start-up plan thirty (30) days in advance
of delivering any energy to HELCO and shall provide written notice to HELCO of
any changes to such start-up plan as soon as reasonably practicable, but no less
than three (3) days in advance of implementing those changes.  SELLER shall use
reasonable efforts to coordinate such start-up and testing so as to minimize any
additional costs to HELCO by departing from economic dispatch in the operation
of HELCO's electrical system. To the extent such costs are reasonably determined
to exceed those which would have resulted from the testing of HELCO's own
generating units of similar type and size, SELLER shall either modify its start-
up and testing plan to accommodate HELCO's reasonable requests or reimburse
HELCO for such additional costs.  Electric energy delivered to HELCO pursuant
hereto shall be considered non-firm, unscheduled energy, but must meet all of
the quality standards established in this Agreement.  HELCO shall only pay
Energy Charges for any such energy actually delivered from the Facility.

  A.  Energy Charge
      -------------

  The monthly Energy Charge shall be computed by the following formula:

                                       53
<PAGE>
 
  Energy Charge   =  (Fuel Component + Variable
                      O&M Component) x (.98)

            where:

              Fuel Component = Fuel Component\BASE\ x Facility\PRICE/Fuel\BASE\

              Variable O&M
                Component = Variable O&M Component\BASE\x
                               GDPIPD\CURRENT/GDPIPD\BASE\

  The terms in the above formula shall have the following meanings as stated:

          Fuel\BASE\:      $4.35324/mmBtu, for Fuel defined as "#2 Diesel" (and
                           a higher heating value of 5,860,000 BTU per
                           barrel).

          Facility\PRICE:  During the term of the Fuel Supply Agreement, the
                           Facility Price (stated in $/mmBtu) shall be equal to
                           HELCO's total cost of delivered No. 2 fuel oil at
                           Keahole, including all ocean and land transportation
                           charges, demand charges, storage charges, and taxes,
                           duties and other charges as shown in HELCO's Monthly
                           Fuel Oil Adjusted Factor Filing, or if such cost
                           categories are not reflected in such filing, in a
                           written statement prepared by HELCO and certified by
                           an officer of HELCO which indicates each of the
                           foregoing cost items for delivery of fuel in the
                           volume required by a facility similar in size to the
                           Facility.  If such filing is not made on a timely
                           basis, or is not accurate or does not represent
                           generally available market conditions to SELLER, or
                           upon the expiration or termination of the Fuel Supply
                           Agreement, the Facility Price shall be the actual
                           cost of Fuel delivered to the Facility, including all
                           ocean and land transportation charges, demand
                           charges, storage charges, and taxes, duties and other
                           charges; provided that, upon expiration of the Fuel
                                    -------- ----                             
                           Supply Agreement HELCO shall have the option of
                           supplying the Facility with Fuel pursuant to
                           reasonable and mutually acceptable definitive terms
                           and conditions.

          GDPIPD\CURRENT\: The meaning as described in Attachment I.

          GDPIPD\BASE\:    The meaning as described in Attachment I.

                                       54
<PAGE>
 
     Fuel Component\BASE\: The Fuel Component\BASE\ shall be calculated as
                           described in the following respective equations:

                           1. When two (2) combustion turbines (CT) are in
                              combined cycle operation under equal dispatch
                              levels and the Facility is being dispatched at a
                              level of at least twenty-four (24) MW:

                            Fuel Component\BASE\ (2 CT) in dollars =
                            /P/
                             (SIGMA) [(4.50943 x 10/-12/ x L\i\/2/ - 6.07269
                               /i=1/  
                               x 10/-7/ x L\i\ +
                                   5.51199 x 10/-2/) x KWH\i\]

                           Where L\i\ is the integrated fifteen (15) minute
                           load in kilowatts when SELLER has placed both
                           combustion turbines in combined cycle operation,

                           KWH\i\ is the amount of kilowatt-hours purchased by
                           HELCO during the associated fifteen (15) minute
                           period,

                           and P is the total number of fifteen (15) minute
                           periods during the Billing Period in which both
                           combustion turbines are in combined cycle operation.

                           2. When two (2) combustion turbines (CT) are in
                              combined cycle operation under equal dispatch
                              levels and the Facility is being dispatched at a
                              level of at least sixteen (16) MW but less than
                              twenty-four (24) MW:

                            Fuel Component\BASE\ (2 CT) in dollars =

                           /P/
                           (SIGMA) [(4.35571 x 10/-11/ x L\i\/2/ - 2.45200 x
                            /i=1/                           
                            10/-6/xL\i\ +
                           
                              7.71282 x 10/-2/) x KWH\i\]

                           Where L\i\ is the integrated fifteen (15) minute load
                           in kilowatts when SELLER has placed both combustion
                           turbines in combined cycle operation,

                           KWH\i\ is the amount of kilowatt-hours purchased by
                           HELCO during the associated fifteen (15) minute
                           period,

                                       55
<PAGE>
 
                           and P is the total number of fifteen (15) minute
                           periods during the Billing Period in which both
                           combustion turbines are in combined cycle operation.


                           3. When one (1) combustion turbine (CT) is in
                              combined cycle operation:

                           Fuel Component\BASE\ (1 CT) in dollars =
                           /P/
                           (SIGMA) [(4.97822 x 10/-11/ x L\i\/2/ - 2.67373 x
                            /i=1/
                           10/-6/   x L\i\+
                            
                           7.37449 x 10/-2/) x KWH\i\]

                           Where L\i\ is the integrated fifteen (15) minute
                           load in kilowatts when SELLER has placed such
                           combustion turbine in combined cycle operation,

                           KWH\i\ is the amount of kilowatt-hours purchased by
                           HELCO during the associated fifteen (15) minute
                           period,

                           and P is the total number of fifteen (15) minute
                           periods during the Billing Period in which such
                           combustion turbine is in combined cycle operation.

                           4. When one (1) combustion turbine (CT) is in Simple
                              Cycle operation prior to the Phase 2 In-Service
                              Date:

                           Fuel Component\BASE\ (1 CT) in dollars =
                           /P/
                           (SIGMA) [(7.49648 x 10/-11/ x L\i\/2/ - 3.32621 x
                            /i=1/
                           10/-6/  x L\i\ +

                              8.56126 x 10/-2/) x KWH\i\]

                           Where L\i\ is the integrated fifteen (15) minute
                           load in kilowatts when SELLER has placed such
                           combustion turbine in Simple Cycle operation,

                           KWH\i\ is the amount of kilowatt-hours purchased by
                           HELCO during the associated fifteen (15) minute
                           period,

                           and P is the total number of fifteen (15) minute
                           periods during the Billing Period in which such
                           combustion turbine is in Simple Cycle operation.

                                       56
<PAGE>
 
                           5. After the Phase 2 In-Service Date, when only one
                              (1) combustion turbine (CT) is in Simple Cycle
                              operation:

                           Fuel Component\BASE\ (CT) in dollars =
                           /P/
                           (SIGMA)  [(13.0662 x 10/-11/ x L\i\/2/ - 5.44047 x
                           /i=1/ 
                           10/-6/   x L\i\ +
                              0.107491) x KWH\i\]

                           Where L\i\ is the integrated fifteen (15) minute
                           load in kilowatts when SELLER has placed such
                           combustion turbine in Simple Cycle operation,

                           KWH\i\ is the amount of kilowatt-hours purchased by
                           HELCO during the associated fifteen (15) minute
                           period,

                           and P is the total number of fifteen (15) minute
                           periods during the Billing Period in which such
                           combustion turbine is in Simple Cycle operation.

                           6. After the Phase 2 In-Service Date, if the Facility
                           is operating both combustion turbines in Simple Cycle
                           operation, the Fuel Component\BASE\ equation in (5)
                           above shall be applied to the output of each
                           combustion turbine individually.  The two resultant
                           Fuel Component calculations shall be summed to arrive
                           at the total Fuel Component for the related Billing
                           Period.

                           7. If the Facility is operating in combined cycle
                           operation and HELCO's System Operator has requested
                           that the combustion turbines operate at unequal
                           dispatch levels, the Fuel Component equation in (3)
                           above shall be computed separately for each
                           combustion turbine and summed together to obtain the
                           total Fuel Component for the related Billing Period;
                           provided however, L\i\ for each calculation shall
                           ----------------                                 
                           represent the integrated fifteen (15) minute load in
                           kilowatts for the output of the related combustion
                           turbine plus its associated steam turbine output.

          Variable O&M Component\BASE\:

                           The Facility's Variable O&M Component\BASE\ shall
                           consist of:

                                       57
<PAGE>
 
                           (i) a "Variable Component" of $0.00092 per kWh (1995
                              $); and
 
                           (ii) an "Overhaul Component" of $103.43 per
                              combustion turbine operating hour (1995 $).

Variable and Overhaul Components each shall be escalated annually by the factor
of GDPIPD\CURRENT/GDPIPD\BASE\ as described in "Attachment I."

  In the computation of the Energy Charge, the Fuel Component\BASE\ (the
quantity multiplied by the kWh purchased by HELCO in each fifteen (15) minute
period in the Fuel Component equations above), and the Variable O&M
Component\BASE\ shall each be rounded to six (6) places after the decimal 
(e.g.,0.123456).

  A sample of the Energy Payment calculation is provided in "Attachment P."

  B.  Capacity Charge
      ---------------

     Prior to the Phase 2 In-Service Date, the monthly Capacity Charge shall be
computed by the following formula:

       Capacity Charge = Firm Capacity (kW) x Capacity Rate
                         + Fixed O&M Component

     On and after the Phase 2, In-Service Date, the monthly Capacity Charge
shall be computed by the following formula:

  Capacity Charge = [Firm Capacity-2,000] (kW) x Capacity Rate
                    + Fixed O&M Component

     The terms in the above formulas shall have the following meanings as
stated:

     "Capacity Rate" - Subject to other provisions in this Section 5.1B, the
monthly Capacity Rate shall be $15.43/kW/month.

     "Fixed O&M Component" - The Fixed O&M Component shall be $196,754.16 per
month (1995 $) and shall be escalated annually by the factor of
(GDPIPD\CURRENT/GDPIPD\BASE\), as described in "Attachment I."

     (1) Calculation of the Monthly Capacity Charge.

       The monthly Capacity Charge shall be based on the Firm Capacity of the
Facility as determined in accordance with Section 3.2C(22) (minus two (2) MW of
capacity during the Phase 2 Period for which there shall be no charge),
regardless of the actual level of

                                       58
<PAGE>
 
dispatch of the Facility; provided that, if, at HELCO's request, the Facility
                          -------------                                      
provides additional capacity above the Firm Capacity, the Capacity Charge during
such month shall be based on the higher level of capacity requested by HELCO and
delivered to HELCO at the Metering Point.

     (2)  Acceptance Tests.

     The Capacity Charge payments under this Section 5.1B, shall begin or be
adjusted when the Facility has completed the acceptance tests referred to in
Section 3.2C(22) and SELLER declares that the Facility has achieved the Phase 1
In-Service Date or Phase 2 In-Service Date, as the case may be.

     (3) Capacity Shortfall; Corrective Period.

     In the event the acceptance tests conducted in accordance with Section
3.2C(22) demonstrate that the Facility is unable to provide a Firm Capacity of
at least fifty-seven (57) MW at the time of the Phase 2 In-Service Date, the
following provisions shall apply:

          (a) If the Facility achieves a capacity level of between forty-two
(42) MW and fifty-seven (57) MW, the Phase 2 In-Service Date Deadline will be
deemed to be met, provided that SELLER shall, during the next twelve (12) months
                  -------- ----
or such shorter period during which the Facility achieves Committed Capacity, if
applicable (the "Corrective Period"), use its reasonable best efforts to
increase the Facility's capacity level to the Committed Capacity.

          (b) During the Corrective Period, the Capacity Rate applicable for
such period shall be reduced by one (1) percentage point for each one percent
(1%) that such capacity level is below ninety percent (90%) of the Committed
Capacity.

          (c) If, at the end of the Corrective Period, the Facility has not
achieved a Firm Capacity level of at least fifty-four thousand (54,000) kW, (i)
the Committed Capacity shall be reset at the Firm Capacity level achieved by the
Facility during its most recent Capacity Test conducted pursuant to
Section 3.2C(22) and (ii) until the Firm Capacity is revised by a subsequent
Capacity Test in accordance with Attachment L, the Capacity Rate shall be
reduced by the Corrective Amount to reflect the value of the diminished capacity
level; provided however, the Firm Capacity shall not be adjusted after the
       -------- -------                                                   
Corrective Period without HELCO's prior consent.  The Corrective Amount shall be
calculated as follows:

Corrective Amount (in $/kW/year) =  150 - 0.0025 X Firm Capacity (in kW)

So long as the Facility has achieved a capacity level of at least forty-eight
thousand (48,000) kW, the foregoing adjustments to the level of Committed
Capacity and the Capacity Charge shall be HELCO's sole and exclusive remedy for
the Facility's failure to achieve the guaranteed capacity level.  If the
Facility has not achieved a capacity level of at least forty-eight thousand
(48,000) kW after the Corrective Period, then HELCO shall be entitled to all
rights and remedies provided hereunder.

                                       59
<PAGE>
 
  C.  Hawaii General Excise Tax
      -------------------------

     HELCO shall not be liable for payment of the applicable Hawaii General
Excise Tax levied and assessed against SELLER as a result of this Agreement. The
rates and charges in this Article V shall not be adjusted by reason of any
subsequent increase or reduction of the applicable Hawaii General Excise Tax,
except to the extent such tax applies to other generation units owned by HELCO.

  D.  No Payment of Emission Fees
      ---------------------------

     HELCO shall not be liable for payment of the applicable air pollutant
emission fees imposed by the DoH or U.S. EPA on SELLER as a result of operating
or having the potential to operate the Facility.

  E.  No Payment of Other Taxes or Fees
      ---------------------------------

     HELCO shall not be liable for payment of nor reimbursement of any SELLER
payment of any new or modified tax or fee imposed by any governmental body,
except to the extent such tax applies to other generation units owned by HELCO.


                        ARTICLE VI - BILLING AND PAYMENT

6.1  Monthly Invoice
     ---------------

     As soon as practicable, but not later than the tenth (10th) Business Day of
each Calendar Month, HELCO shall provide SELLER with the appropriate data for
SELLER to compute the payment due for capacity provided and electricity
delivered to HELCO in the preceding Calendar Month as determined in accordance
with this Agreement.  SELLER shall compute the Capacity Charge for the same
Calendar Month and promptly thereafter submit an invoice ("Monthly Invoice") for
the Capacity Charge and Energy Charge to be paid to SELLER for the preceding
Calendar Month.  Each Monthly Invoice shall include SELLER's backup data for the
computation of the Capacity Charge and the Energy Charge.  Unless and until
HELCO designates a different address, the Monthly Invoice shall be delivered to:

               Hawaii Electric Light Company, Inc.
               1200 Kilauea Avenue
               Hilo, Hawaii  96720-4295
               Attention:  Manager of Production (or such other individual
                              as HELCO may designate in writing)

                                       60
<PAGE>
 
6.2  Payment
     -------

     As soon as practicable, but in no event later than five (5) Business Days
following HELCO's receipt of the Monthly Invoice from SELLER, HELCO shall pay,
in immediately available funds, such monthly Capacity Charge and Energy Charge
payments as computed in Article V, or provide to SELLER an itemized statement of
its objections to all or any portion of such Monthly Invoice and pay any
undisputed amount.  If any Capacity Charge or Energy Charge payments are made
more than five (5) Business Days after HELCO's receipt of the related Monthly
Invoice, HELCO shall also include interest on such payments, which shall be
computed at a rate equal to the Prime Rate plus two (2) percentage points per
annum.

6.3  Adjustments
     -----------

     In the event adjustments are required to correct inaccuracies in Monthly
Invoices, the party requesting adjustment shall use the method described in
Section 3.2E(4), if applicable, to determine the correct measurements, and shall
recompute the amounts due during the period of such inaccuracies.  Except as
noted below, the difference between the amount paid and that recomputed for each
Monthly Invoice affected shall be paid, or repaid, with interest from the date
that such Monthly Invoice was payable until the date that such recomputed amount
is paid at the average daily Prime Rate at the Bank of Hawaii for the period, or
objected to by the party responsible for such payment within thirty (30) days
following its receipt of such request.  All claims for adjustments shall be
waived for any deliveries of electricity made more than thirty-six (36) months
preceding the date of any such request.  Adjustments to correct Monthly Invoices
resulting from escalation indices not being published at the time such Monthly
Invoices were prepared shall be paid or refunded without interest.  The
escalation indices initially published by the appropriate governmental or
industry body for the period covered by the invoice shall be the indices
applied.

6.4  Other Payments
     --------------

     Any amounts due from either party under this Agreement other than monthly
Energy Charges and Capacity Charges shall be paid or objected to within thirty
(30) days following receipt from either party of an itemized invoice from the
other party setting forth, in reasonable detail, the basis for such invoice.

                             ARTICLE VII - DEFAULT

7.1  Events of Default
     -----------------

  A.  Default by SELLER
      -----------------

     The occurrence of any of the following events at any time during the Term
of this Agreement shall constitute an "Event of Default" by SELLER:

                                       61
<PAGE>
 
     (1) By (a) fifteen (15) months after the Phase 1 In-Service Date Deadline
or Phase 2 In-Service Date Deadline, respectively and in each case, as extended
for Force Majeure, the Facility has not achieved the Phase 1 In-Service Date or
Phase 2 In-Service Date, respectively (including satisfaction of all conditions
associated therewith in accordance with Section 2.3A(3) and (4)) or (b) thirty-
six (36) months after the PUC Approval Date or fifty-four (54) months after the
PUC Submittal Date, the Facility has not achieved the Phase 2 In-Service Date;
provided, that the Events of Default referred to in this Section 7.1A(1) once
- --------  ----
triggered shall not be subject to Section 7.2C.

     (2) HELCO declares an Event of Default in accordance with Section 2.4A(1).

     (3) HELCO declares an Event of Default pursuant to Section 2.3B(1).

     (4) SELLER shall fail to pay HELCO any amount as and when due under this
Agreement (less any amounts disputed in good faith pursuant to Article XIV) and
neither SELLER nor the Financing Parties remedy such non-payment within ten (10)
days after written demand therefor by HELCO served upon SELLER with a copy
served upon the Financing Parties.

     (5) SELLER shall fail to operate, maintain or repair the Facility in
accordance with the terms of this Agreement such that a condition exists in the
Facility which has an adverse physical impact on HELCO's electrical system or
the equipment of HELCO's customers or which HELCO reasonably determines presents
an immediate danger to personnel or equipment, and SELLER shall fail to initiate
and diligently pursue reasonable action to cure such failure within seven (7)
days after actual receipt by SELLER and the Financing Parties of demand therefor
by HELCO; provided, that in the event SELLER fails to initiate and diligently
pursue reasonable action to cure such failure within such seven (7) day period,
HELCO may, after providing written notice to SELLER and Financing Parties, enter
upon the Site, and undertake such reasonable action on behalf of SELLER,
consistent within Good Engineering and Operating Practices, until either such
adverse effect or danger is eliminated or HELCO is reasonably satisfied that
SELLER has initiated and is diligently pursuing such reasonable action; and
provided, further, that, such right, if exercised, shall be HELCOOs exclusive
remedy for SELLER's failure to act within the period required herein. SELLER
shall bear or reimburse HELCO for, as the case may be, for all reasonable,
documented, out-of-pocket costs incurred by HELCO in connection with such
reasonable actions taken by HELCO on behalf of SELLER as provided herein, and
shall cooperate in good faith with HELCO in providing access to the Facility and
the Site, in the event HELCO elects to undertake such action as provided herein.

     (6) SELLER shall abandon the Facility prior to the Phase 2 In-Service Date
or shall fail to maintain continuous service to the extent required by this
Agreement when it has the technical capability to do so for a period of seven
(7) or more consecutive days, the last twenty-four (24) hours of which shall be
after notice by HELCO to SELLER that it is not in compliance with this
provision, unless such abandonment or failure is caused by Force Majeure or an
Event of Default by HELCO. For purposes of this Section 7.1A(6), (i) abandonment
of the Facility during the construction phase shall mean the failure by SELLER,
after the PUC Approval Date,

                                       62
<PAGE>
 
to proceed with or prosecute in a diligent manner the planning, design,
engineering, permitting, completion (including, without limitation, purchasing,
accounting, training and administration) and start up of the Facility for a
consecutive period of thirty (30) days, the last ten (10) days of which shall be
after notice from HELCO to SELLER that it is not in compliance with this
provision; and (ii) technical capability to maintain continuous service shall
mean that the Facility could be operated in a safe manner at that time in
accordance with Good Engineering and Operating Practices.

     (7) SELLER shall be found by the professional engineering firm retained
from the Qualified Independent Engineers List to have failed to initiate and
diligently pursue adequate action to comply with such firm's recommendations
after proper notification as required by Section 3.3D(1).

     (8) SELLER shall fail to meet the performance requirements specified in
Section 3.2D(1) or Section 3.2D(2) by more than five (5) percentage points on
average in any two (2) full consecutive Contract Years or by more than ten (10)
percentage points for any one (1) full Contract Year after the Phase 2 In-
Service Date or shall fail to have the capability of supplying upon request of
HELCO Dispatch the Firm Capacity specified in Section 3.2D(3) by ten percent
(10%) or more for any two (2) full consecutive Contract Years unless such
failure is due to a Force Majeure event, a Catastrophic Equipment Failure, or a
major outage pre-approved by HELCO pursuant to Section 3.2B(6) as required to
prevent a Catastrophic Equipment Failure.

     (9)  SELLER shall fail to meet the performance requirements specified in
Section 3.2D(5) by more than three (3) Unit Trips in each of any two (2)
consecutive Contract Years, or the Facility experiences twelve (12) or more Unit
Trips in any one (1) full Contract Year after the Phase 2 In-Service Date.

     (10) SELLER shall (a) be dissolved, be adjudicated as bankrupt, or become
subject to an order for relief under any federal bankruptcy law; (b) fail to
pay, or admit in writing its inability to pay, its debts generally as they
become due; (c) make a general assignment of substantially all its assets for
the benefit of creditors other than to the Financing Parties; (d) apply for,
seek, consent to, or acquiesce in the appointment of a receiver, custodian,
trustee, examiner, liquidator or similar official for itself or any substantial
part of its property; (e) institute any proceedings seeking an order for relief
or to adjudicate it as bankrupt or insolvent, or seeking dissolution, winding
up, liquidation, reorganization, arrangement, adjustment or composition of it or
its debts under any law relating to bankruptcy, insolvency, reorganization or
relief of debtors; or (f) take any action to authorize or effect any of the
foregoing actions.

     (11) Without the application, approval or consent of SELLER, a receiver,
trustee, examiner, liquidator or similar official shall be appointed for SELLER,
or any part of its property, or a proceeding described in Section 7.1A(10)(e)
shall be instituted against SELLER and such appointment shall continue
undischarged or such proceeding shall continue undismissed or unstayed for a
period of sixty (60) consecutive days or SELLER shall fail to file in a timely
manner, an answer or other pleading denying the material allegations filed
against it in any such proceeding.

                                       63
<PAGE>
 
     (12) Without the prior written consent of HELCO, SELLER shall transfer,
convey, lose or relinquish its right to own the Facility or to occupy the Site
to any person, except an entity to whom SELLER may assign this Agreement under
Article XVII or Article XIX.

     (13) SELLER shall fail to make all reasonable efforts to restore the
Facility to full or substantially full operating condition to the extent it is
determined, after consultation with HELCO and the Financing Parties following
settlement of any casualty loss, to be reasonable to do so and such failure
continues for thirty (30) days after written demand therefor by HELCO.

     (14) HELCO shall declare an event of default under the Security Documents,
which event of default shall not have been cured within the time permitted for
such cure therein.

     (15) SELLER shall fail to maintain in full force and effect throughout the
Term either the Guarantee(s) or a letter of credit or bond in substitution
therefor in accordance with the provisions of Article XXI.

     (16) The Guarantor(s) or the issuer of the letter of credit or bond
provided in substitution for the Guarantee(s) pursuant to Article XXI shall fail
to pay to HELCO any amount as to which it has a proper claim, as and when due
under such Guarantee(s), letter of credit or bond, respectively, and neither the
Guarantor(s), such issuer nor the Financing Parties remedy such non-payment
within forty-five (45) days after written demand therefor by HELCO served upon
the Guarantor(s) or such issuer, as appropriate, with a copy served upon the
Financing Parties.

     (17) SELLER shall fail to provide to HELCO in accordance with Article XXI
an acceptable letter of credit or bond in substitution for the Guarantee(s)
within thirty (30) days after the occurrence, with respect to the Guarantor(s),
of any of the events specified in paragraphs (10) or (11) of this Section 7.1A
as constituting an Event of Default upon the occurrence thereof with respect to
Guarantor(s) instead of SELLER.

     (18) SELLER shall fail to comply with an arbitrator's decision under
Article XIV within thirty (30) days after such decision becomes binding on the
parties in accordance with Section 14.2E or, if such decision cannot be complied
with within thirty (30) days, SELLER shall fail to have commenced efforts
designed to comply and diligently continued such efforts until compliance is
attained.

     (19) SELLER shall fail to perform a material obligation of this Agreement
not otherwise specifically referred to in this Section 7.1A, which failure has a
material adverse effect on SELLER's delivery of capacity and energy to HELCO in
accordance with the terms of this Agreement and which failure shall continue for
forty-five (45) days after written demand by HELCO for performance thereof.

                                       64
<PAGE>
 
  B.  Default by HELCO
      ----------------

     The occurrence of any of the following at any time during the Term of this
Agreement shall constitute an "Event of Default" by HELCO:

     (1) HELCO shall fail to pay SELLER any amount as and when due under this
Agreement (less any amounts disputed in good faith pursuant to Section 6.2 or
Article XIV) and shall fail to remedy such non-payment within ten (10) days
after demand therefor from SELLER.

     (2) HELCO shall fail to construct, operate, maintain or repair the
Interconnection Facilities for which HELCO is responsible for under the
Interconnection Agreement, in accordance with the terms of this Agreement, such
that the safety of persons or property, the Facility, SELLER's equipment, or
SELLER's entitlement to payments hereunder for capacity or energy is adversely
affected, and shall fail to cure such failure within fourteen (14) days after
demand therefor from SELLER.

     (3) HELCO shall abandon the Interconnection Facilities or shall discontinue
purchases of capacity and energy required under this Agreement, unless such
discontinuance is caused by reasons of Force Majeure or an Event of Default by
SELLER.

     (4) HELCO shall (a) be dissolved, be adjudicated as bankrupt, or become
subject to an order for relief under any federal bankruptcy law; (b) fail to
pay, or admit in writing its inability to pay, its debts generally as they
become due; (c) make a general assignment of substantially all its assets for
the benefit of creditors, other than to the Trustee under its First Mortgage
Indenture dated December 1, 1938, as amended; (d) apply for, seek, consent to,
or acquiesce in the appointment of a receiver, custodian, trustee, examiner,
liquidator or similar official for itself or any substantial part of its
property; (e) institute any proceedings seeking an order for relief or to
adjudicate it as bankrupt or insolvent, or seeking dissolution, winding up,
liquidation, reorganization, arrangement, adjustment or composition of it or its
debts under any law relating to bankruptcy, insolvency, reorganization, or
relief of debtors or (f) take any action to authorize or effect any of the
foregoing actions.

     (5) Without the application, approval or consent of HELCO, a receiver,
trustee, examiner, liquidator or similar official shall be appointed for HELCO
or any part of its respective property, or a proceeding described in
Section 7.1B(4)(e) shall be instituted against HELCO and such appointment shall
continue undischarged or such proceeding shall continue undismissed or unstayed
for a period of sixty (60) consecutive days or HELCO shall fail to file timely
an answer or other pleading denying the material allegations filed against it in
any such proceeding.

     (6) HELCO shall fail to comply with an arbitrator's decision under
Article XIV within thirty (30) days after such decision becomes binding on the
parties in accordance with Section 14.2E or, if such decision cannot be complied
with within thirty (30) days, HELCO shall fail to have commenced efforts
designed to comply and diligently continued such efforts until compliance is
attained.

                                       65
<PAGE>
 
     (7) HELCO shall fail to perform a material obligation of this Agreement not
otherwise specifically referred to in this Section 7.1B, which failure shall
have a material adverse effect on its ability to accept and pay for, or SELLER's
ability to deliver, capacity and energy in accordance with the terms of this
Agreement and which failure shall continue for forty-five (45) days after
written demand by SELLER for performance thereof.

  C.  Right to Cure Default
      ---------------------

     (1) Cure Period - An Event of Default shall not be declared or deemed to
exist if the defaulting party cures such Event of Default within forty-five (45)
days of receipt of notice from the non-defaulting party or, if a cure may not be
effected within such forty-five (45) day period, the defaulting party commences
its reasonable best efforts to cure such Event of Default during such period and
diligently pursues such efforts to completion. This provision shall not apply to
an Event of Default under Sections 7.1A(1),(8),(9), (10), (11) or (18) or
Sections 7.1B (4), (5) or (6).

     (2) Effect of Cure on Event of Default - If an Event of Default occurs (or
if conditions exist which would permit HELCO or SELLER to declare an Event of
Default) and if such Event of Default (or the conditions which would permit
HELCO or SELLER to declare an Event of Default) is cured prior to any invocation
of remedies therefor, remedies (other than the payment of damages associated
with such Event of Default) for such Event of Default shall not thereafter be
invoked.

7.2  Rights and Obligations of the Parties Upon Default
     --------------------------------------------------

  A.  Notice of Default
      -----------------

     Upon the occurrence of an Event of Default specified in Section 7.1, the
non-defaulting party shall deliver to the defaulting party (with a copy to the
Financing Parties and/or the collateral agent designated therefor) a written
notice which (i) declares that an Event of Default has occurred under
Section 7.1 of this Agreement; and (ii) identifies the specific provision or
provisions of such Section under which such Event of Default shall have
occurred.

  B.  Right to Terminate
      ------------------

     If an Event of Default under Section 7.1 shall have occurred and not been
cured within the cure periods provided in Section 7.1C, or, as to Events of
Default under Sections 7.1A(8) or (9) pursuant to the remedial provisions
described therein, or such other cure periods provided under the Financing
Documents to which HELCO is a party, as applicable, the non-defaulting party
shall have the right to terminate this Agreement by delivering a written notice
of termination which shall be effective thirty (30) days from the date such
notice is delivered; provided, that if such notice of termination is not given
                     --------  ----                                           
within thirty (30) days of the date such right to terminate is triggered, such
termination shall not be effective.

                                       66
<PAGE>
 
  C.  Right to Demand Independent Engineering Assessment and Modification
      -------------------------------------------------------------------

     (1) If an Event of Default described in Section 7.1A(8) or (9) occurs,
HELCO shall, prior to exercising its rights under Section 7.2A or Section 7.2B
on the basis thereof, give written notice to SELLER that it will obtain an
Independent Engineering Assessment concerning the failure to meet the specified
warranted levels. Within thirty (30) days after receipt by SELLER of such
notice, a president, vice president, or other authorized delegate of HELCO and
SELLER, both having full authority to settle the matter, shall personally meet
in Hawaii and attempt in good faith to make the determination described in
Section 7.2C(2). If these officials reach agreement on a determination, the
provisions of 7.2C(3) and (4) shall apply thereto. If no meeting takes place
within thirty (30) days of SELLER's receipt of the aforesaid written notice, or
if agreement between these officials is not reached within forty-five (45) days
of SELLER's receipt of such notice, HELCO may at any time thereafter require
that an Independent Engineering Assessment be conducted in accordance with
Section 3.3D except that in every instance all costs of such Independent
Engineering Assessment shall be borne by SELLER.

     (2) The representatives of the parties or the Qualified Independent
Engineer based on the Independent Engineering Assessment, as applicable, shall
determine whether there are commercially reasonable changes in the Facility, or
in the manner in which SELLER operates the Facility, which (i) could be
implemented within two hundred and seventy (270) days (or such other time period
which HELCO and SELLER mutually agree upon) after the Qualified Independent
Engineer's or the representatives' decision, and (ii) could reasonably be
expected to result in future operation of the Facility in each Contract Year at
the following levels:

     (a) An EAF not less than ninety percent (90%) computed in accordance with
Section 3.2D(1);

     (b) An EFOR not to exceed four percent (4%) computed in accordance with
Section 3.2D(2);

     (c) The Facility shall have the capability, within Good Engineering and
Operating Practices and within the design limitations of the Facility equipment,
of producing not less than ninety percent (90%) of the Firm Capacity; or

     (d) No more than six (6) Unit Trips in any Contract Year.

     (3) If the representatives of the parties or the Qualified Independent
Engineer based on the Independent Engineering Assessment, as applicable,
determine that there are no commercially reasonable changes meeting the
requirements of paragraph (2) above, HELCO may thereafter declare an Event of
Default on the basis of the failure described in Section 7.1A(8) or (9) which
preceded HELCO's request for an Independent Engineering Assessment.

     (4) If the representatives of the parties or the Qualified Independent
Engineer based on the Independent Engineering Assessment, as applicable,
determine that there are

                                       67
<PAGE>
 
commercially reasonable changes meeting the requirements of paragraph (2) above,
HELCO may not declare an Event of Default on the basis of the failure described
in Section 7.1A(8) or (9) which preceded HELCO's request for an Independent
Engineering Assessment unless SELLER either (i) fails to diligently carry out
such recommended changes as determined in accordance with the procedures and
requirements set forth in Section 3.3D or (ii) implements such changes but the
Facility nevertheless does not meet the standards of Section 7.2C(2) in the
first full Contract Year after such changes are implemented; provided that, if
                                                             -------- ----
such right to declare an Event of Default is not exercised within three (3)
months after such first full Contract Year, HELCO shall be deemed to have waived
such right.

     (5) The remedies provided in this Section 7.2C shall be HELCO's sole and
exclusive remedy pending the determinations set forth herein and, if applicable,
implementation of changes to the Facility as prescribed herein.

  D.  Other Rights Upon Default
      -------------------------

     Upon the occurrence of an Event of Default by either party, the non-
defaulting party, subject to the rights described in Sections 7.1C, 7.2B, 7.2C
and Article XIV of this Agreement, may exercise, at its election, any rights and
claim and obtain any remedies it may have at law or in equity, including, but
not limited to, compensation for monetary damages, injunctive relief and
specific performance.


                 ARTICLE VIII - LIQUIDATED DAMAGES FOR FAILURE
                    TO ATTAIN WARRANTED PERFORMANCE; BONUSES


     Recognizing that HELCO must provide the ultimate service to its customers
and that the capacity and energy produced by the Facility is needed to meet the
requirements of HELCO's customers, and in order to avoid the difficulties of
proof in connection with the damages HELCO would incur in the event of a failure
of the Facility to meet the performance standards herein, the parties agree that
the following Liquidated Damages for failure by SELLER to attain warranted
performance (1) constitute a reasonable and good faith pre-estimate of the
anticipated or actual loss or damage which would be incurred by HELCO as a
result of such failure, (2) are not intended as a penalty, (3) may be invoked by
HELCO to ensure that the Facility meets the performance standards established
under this Agreement and (4) constitute HELCO's sole and exclusive remedy,
except as otherwise specifically provided in Article VII.

8.1  Liquidated Damages
     ------------------

  A.  Equivalent Availability Factor
      ------------------------------

For each one-tenth (1/10) of a percentage point that the Equivalent Availability
Factor falls below the guaranteed level specified in Section 3.2D(1) on average
for the current Contract Year and previous Contract Year (minimum twenty-four
(24) month continuous period is to be used) down to ten (10) percentage points
below such guaranteed level, SELLER shall pay to HELCO

                                       68
<PAGE>
 
Liquidated Damages in the amount set forth in the following table (on a
progressive basis) upon proper demand at the end of the current Contract Year in
accordance with Section 8.2.

Amount Below Guaranteed Level

   0% - 4.9%         $ 7,500 (1998 $) per 0.1%
 5.0% - 9.9%         $10,000 (1998 $) per next 0.1% and thereafter until 10.0%

For each one-tenth (1/10) of a percentage point that the Equivalent Availability
Factor of the Facility falls ten (10) percentage points or more below the
guaranteed level specified in Section 3.2D(1) on average for the current
Contract Year and previous Contract Year (minimum twenty-four (24) month
continuous period is to be used) down to fifteen (15) percentage points below
such guaranteed level, SELLER shall deposit in the Maintenance Account Twelve
Thousand Dollars ($12,000) (1998 $) in accordance with Section 8.3.

  B.  Equivalent Forced Outage Rate
      -----------------------------

     For each one-tenth (1/10th) of a percentage point that the EFOR exceeds the
guaranteed level in Section 3.2D(2) on average for the current Contract Year and
the previous Contract Year (minimum twenty-four (24) month continuous period is
to be used) up to ten percent (10%) above such guaranteed level, SELLER shall
pay HELCO Liquidated Damages in the amount set forth in the following table (on
a progressive basis) upon proper demand at the end of the current Contract Year,
in accordance with Section 8.2.

  Amount Above Guaranteed Level

   0% - 4.9%      $3,000 (1998 $) per 0.1%
 5.0% - 9.9%      $4,000 (1998 $) per next 0.1% and thereafter until 10.0%

For each one-tenth (1/10) of a percentage point that EFOR exceeds by ten (10)
percentage points or more the guaranteed level specified in Section 3.2D(1) on
average for the current Contract Year and previous Contract Year (minimum
twenty-four (24) month continuous period is to be used) up to fifteen (15)
percentage points above such guaranteed level, SELLER shall deposit in the
Maintenance Account Five Thousand Dollars ($5,000) (1998 $) in accordance with
Section 8.3.

  C.  Ramp Derating Penalty
      ----------------------

     The parties acknowledge and agree that it is essential that the Facility
has the capability to ramp both upwards and downwards at the ramp rates
specified in Section 3.2C(25). In the event the Facility cannot achieve these
ramp rates in accordance with Section 3.3A(2), SELLER shall pay Liquidated
Damages for the ramp derating in the month following the derating in accordance
with the following formula as illustrated in "Attachment K":

       $0.01981/kWh X Ramp Derating (kWh)

                                       69
<PAGE>
 
  This Liquidated Damage computation shall apply to the total period in which
the derating persists; provided that, SELLER's liability under this Section 8.1C
shall be subject to the limits set forth in Section 3.3A(2).

  D.  Excessive Unit Trips
      --------------------

     For each Unit Trip in excess of the limit set forth in Section 3.2D(5) on
average for the current Contract Year and the previous Contract Year (minimum
twenty-four (24) month continuous period is to be used), SELLER shall pay HELCO
Liquidated Damages in the amount set forth in the following table (on a
progressive basis) upon proper demand at the end of the current Contract Year,
in accordance with Section 8.2:

      Excessive Unit Trips
      --------------------

      1 - 3 unit trips        $5,000 per trip
      4 - 7 unit trips        $7,500 per next trip
      8 or more unit trips    $10,000 per next trip

8.2  Payment of Liquidated Damages
     -----------------------------

  SELLER shall pay the aggregate amount of Liquidated Damages for each Contract
Year within thirty (30) days after such Contract Year; provided that, at
                                                       -------------    
SELLER's option, SELLER may pay such amount in one-twelfth (1/12) increments per
Calendar Month during the following Contract Year, along with a carrying charge
on the balance of such amount computed at the Prime Rate plus three percent (3%)
per annum.  In the event SELLER fails to pay HELCO undisputed amounts of
Liquidated Damages due under this Section 8.2 within thirty (30) days of receipt
of HELCO's written demand, HELCO shall be entitled to seek payment under the
Guarantee(s), or any replacement security provided in accordance with
Article XXI, and, to the extent SELLER's obligations to pay undisputed
Liquidated Damages are not fulfilled thereafter, HELCO may offset such
undisputed amounts due against payments it is otherwise obligated to make under
this Agreement.

8.3  Maintenance Account.
     --------------------

     SELLER shall establish an escrow account (the "Maintenance Account") to be
held by a Financing Party or other entity approved by the Financing Parties.
SELLER shall deposit monies in the Maintenance Account in accordance with
Sections 3.3A(2), 8.1 and this Section 8.3.  The aggregate amount, if any,
required pursuant to Sections 3.3A(2) and 8.1 for each Contract Year, shall
deposited by SELLER into the Maintenance Account within thirty (30) days after
such Contract Year.  Notwithstanding anything to the contrary in Section 8.1 or
in this Section 8.3, the amount held in the Maintenance Account shall not exceed
Four Million Dollars ($4,000,000) (1998 $) at any time and SELLER shall not be
required to deposit any monies to the Maintenance Account to the extent such
deposit shall cause the amount held therein to exceed Four Million Dollars
($4,000,000) (1998 $).

                                       70
<PAGE>
 
     Amounts held in the Maintenance Account shall be dedicated solely to fund
maintenance, modification or repairs to the Facility on an expedited basis which
are reasonably necessary to bring EAF or EFOR within guaranteed levels, to cure
any problems giving rise to a ramp derating pursuant to Section 3.3A(2) or to
otherwise enhance the Facility's ability to meet the performance standards in
Section 3.2D of this Agreement; provided, however, SELLER shall be entitled to
                                --------  -------                             
withdraw all amounts held therein upon the earlier of (i) once the EAF and EFOR
levels are brought within such guaranteed levels for a period of two (2)
consecutive years and any problems giving rise to a ramp derating are cured, or
(ii) termination of this Agreement.  Amounts held in the Maintenance Account
shall be invested pursuant to SELLER's instructions.

     SELLER shall be entitled to draw against the Maintenance Account upon
presentation of an officer's certificate, signed by the president, vice-
president, or other authorized delegate of SELLER, stating:

     (a) the amount required to be disbursed;

     (b) the person to which the disbursement is to be paid; and

     (c) either (i) that the disbursement is to fund maintenance, modification
or repairs to the Facility reasonably necessary to bring EAF or EFOR, as the
case may be, within guaranteed levels, to cure problems giving rise to a ramp
derating or to otherwise enhance the Facility's ability to meet in the
performance standards in Section 3.2D of this Agreement and that no portion of
the amount then being requested to be disbursed has been set forth in any
previous certificate requesting disbursement; (ii) that the EAF or EFOR level,
as the case may be, has been within guaranteed levels for a period of two (2)
consecutive years and that any problems giving rise to a ramp derating have been
cured; or (iii) that this Agreement has been terminated.

Upon receipt of such certificate, the Financing Party or other entity holding
the Maintenance Account shall disburse the amount set forth in (a) above to
SELLER.

8.4  Adjustments
     -----------

     All of the dollar values noted in Sections 8.1A, 8.1B and 8.3 will be
adjusted each Contract Year in accordance with "Attachment I."


           ARTICLE IX - HELCO'S INSPECTION OF FACILITY OPERATION AND
              USE OF FACILITY SITE; OPTION FOR SITE REPRESENTATIVE

9.1  Inspection of Facility Operation
     --------------------------------

     SELLER shall permit HELCO, its employees and agents (including but not
limited to affiliates and contractors and their employees) to enter upon and
inspect the Facility and SELLER's construction, operation and maintenance
thereof from time to time, upon reasonable prior notice, provided that such
                                                         -------- ----
inspections shall not interfere with SELLER's operation of the Facility and do
not occur more than four (4) times per year; provided further that to the extent
                                             -------- ------- ----

                                       71
<PAGE>
 
there exists a major operating problem with the Facility, HELCO shall be
permitted to enter upon and inspect the Facility without regard to the four (4)
times per year limitation. HELCO shall also be entitled to conduct non-intrusive
site visits to the Facility personnel at the Site; provided that such visits
                                                   -------------            
shall not occur more than once a month.

     If HELCO observes a condition during such inspections which it has
reasonable cause to believe may have an adverse impact on SELLER's ability to
fulfill its obligations under this Agreement, HELCO may make a written request
for and SELLER shall provide a written report on such condition within thirty
(30) days. HELCO's inspection of SELLER's equipment or operation shall not be
construed as endorsing the design thereof nor as any warranty of the safety or
reliability of said equipment or operation nor as a waiver of any right by
HELCO.

9.2  Entry for Work On Site
     ----------------------

     SELLER shall permit HELCO, its employees and agents (including but not
limited to affiliates and contractors and their employees) to enter upon the
Site, with such prior notice as is reasonable under the circumstances, to take
such action as may be necessary in the reasonable opinion of HELCO to: (A)
maintain, inspect, read and test meters and other HELCO equipment pursuant to
Section 3.2E, (B) to interconnect, interrupt, monitor or measure electrical
generation produced at the Facility in accordance with the terms of this
Agreement, and (C) to exercise any other rights HELCO may have under this
Agreement.

9.3  Provision of Site Space
     -----------------------

     SELLER shall provide without charge suitable space on the Site for all
HELCO equipment to be placed on the Site under this Agreement. Suitable space as
used herein means space appropriate for the intended use with adequate electric
power, air conditioning, telecommunication wiring, security, and other necessary
building services. In addition, SELLER shall provide a means for reasonable
access by HELCO to the Site, also without charge to HELCO. If HELCO exercises
its rights to have a Site Rep under Section 9.5, SELLER will provide suitable
office space at the Site for such Site Rep.

9.4  No Ownership Interest
     ---------------------

     Neither SELLER nor any Financing Party shall acquire any ownership interest
or security interest in or lien or mortgage on any equipment installed, owned,
and maintained at the Site by HELCO pursuant to this Agreement, and HELCO shall
have a reasonable time after termination of this Agreement in which to remove
such equipment.

9.5  HELCO Site Representative Option
     --------------------------------

     If HELCO reasonably believes, based on its review of the Facility's
operating records and the Facility's actual failure to perform in accordance
with the terms of this Agreement over a six (6) month period, that the Facility
is not being operated in accordance with this Agreement, HELCO may, following
ten (10) days' written notice to SELLER thereof, have a Site

                                       72
<PAGE>
 
Representative ("Site Rep") observe Facility operations continuously for a
period of up to thirty (30) days.  During this period, the Site Rep shall have
access at all reasonable times to any and all operational areas of the Facility.
SELLER shall comply with any reasonable request of the Site Rep for information
concerning the operation (including fueling) and maintenance of the Facility.
The Site Rep shall not adversely impact SELLER's operations and shall comply
with SELLER's safety and related standards and conditions.  HELCO shall be
liable for any negligent actions or willful misconduct of the Site Rep that
results in any injury or damage to any person (including the Site Rep), real
property or personal property at or immediately adjacent to the Site, or
adversely impacts SELLER's ability to operate the Facility.


                            ARTICLE X - AUDIT RIGHTS

10.1  Rights of HELCO
      ---------------

     HELCO shall have the right throughout the Term and for a period of three
(3) years following the end of the Term, as extended, upon reasonable prior
notice, to audit the books and records of SELLER to the limited extent necessary
to verify the basis for any claim by SELLER for payments from HELCO. HELCO shall
not have the right to audit other financial records of SELLER. SELLER shall make
such records available at its offices in Hawaii during normal business hours.
HELCO shall pay SELLER's reasonable costs for such audits, including allocated
overhead.

10.2  Rights of SELLER
      ----------------

     SELLER shall have the right throughout the Term and for a period of three
(3) years following the end of the Term, as extended, upon reasonable prior
notice, to audit the books and records of HELCO to the limited extent necessary
to verify the basis for charges invoiced by HELCO to SELLER under this
Agreement. SELLER shall not have the right to audit other financial records of
HELCO. HELCO shall make such information available during normal business hours
at its offices in Hawaii. SELLER shall pay HELCO's reasonable costs for such
audits, including allocated overhead.


                          ARTICLE XI - INDEMNIFICATION


11.1  Indemnification of HELCO
      ------------------------

     A.   SELLER shall indemnify, defend, and hold harmless HELCO, its
successors, permitted assigns, affiliates, controlling persons, directors,
officers, employees, servants and agents, including but not limited to
contractors and their employees (collectively referred to as an "Indemnified
HELCO Party"), from and against any and all third party claims, demands,
obligations, liabilities (including, without limitation, liabilities arising out
of the doctrine of strict liability), losses, damages, penalties, fines,
actions, suits, judgments, costs, expenses and disbursements (including without
limitation, reasonable attorneys' fees and expenses) and

                                       73
<PAGE>
 
proceedings of any nature whatsoever for personal injury or death or damage to
property, whether or not well founded, meritorious or unmeritorious, demanded,
asserted or claimed against, imposed on, or incurred by an Indemnified HELCO
Party in any way relating to or arising out of the performance by SELLER or its
agents or subcontractors of this Agreement, except to the extent that any of the
foregoing is attributable to the negligence or intentional action of an
Indemnified HELCO Party or a failure of HELCO to comply with Section 3.1B.

     B.   Any fines or other penalties incurred by an Indemnified SELLER Party
(as defined in Section 11.2A) for noncompliance by SELLER or an Indemnified
SELLER Party with laws, rules, regulations, orders or other governmental actions
referred to in Section 3.2I shall not be reimbursed by HELCO but shall be the
sole responsibility of SELLER.  SELLER shall indemnify, defend and hold harmless
each Indemnified HELCO Party from and against any and all liabilities, damages,
losses, penalties, claims, demands, suits, costs, expenses, disbursements
(including attorney's fees) and proceedings of any nature whatsoever suffered or
incurred because of the failure of SELLER to comply with any of the laws, rules,
regulations, orders or other governmental actions referred to in Section 3.2I.

     C.   If SELLER shall obtain knowledge of any claim indemnified against
under Section 11.1A or otherwise under this Agreement, SELLER shall give prompt
notice thereof to HELCO, and if HELCO shall obtain any such knowledge, HELCO
shall give prompt notice thereof to SELLER.

     D.   In case any action, suit or proceeding shall be brought against an
Indemnified HELCO Party, HELCO shall notify SELLER of the commencement thereof
and, provided that it has acknowledged in writing to HELCO its obligation to an
Indemnified HELCO Party under this Article XI, SELLER shall be entitled, at its
own expense, acting through counsel acceptable to HELCO, to participate in and,
to the extent that SELLER desires, to assume and control the defense thereof;
provided, however, that SELLER shall not be entitled to assume and control the
- --------  -------                                                             
defense of any such action, suit or proceeding if and to the extent that, in the
opinion of HELCO, such action, suit or proceeding involves the potential
imposition of criminal liability on an Indemnified HELCO Party or a conflict of
interest between an Indemnified HELCO Party and SELLER.  HELCO shall be
entitled, at its own expense, acting through counsel acceptable to SELLER to
participate in any action, suit or proceeding, the defense of which has been
assumed by SELLER.  HELCO shall supply SELLER with such information and
documents requested by SELLER as are necessary or advisable for SELLER to
possess in connection with its participation in any action, suit or proceeding
to the extent permitted by this Section 11.1D.  An Indemnified HELCO Party shall
not enter into any settlement or other compromise with respect to any claim
without the prior written consent of SELLER, which consent shall not be
unreasonably withheld or delayed.

     E.   Upon payment of any claim by SELLER pursuant to Section 11.1D or other
similar indemnity provisions contained herein to or on behalf of HELCO, SELLER,
without any further action, shall be subrogated to any and all claims that an
Indemnified HELCO Party may have relating thereto, and HELCO shall cooperate
with SELLER and give such further assurances as are necessary or advisable to
enable SELLER vigorously to pursue such claims.

                                       74
<PAGE>
 
     11.2 Indemnification of SELLER
          -------------------------

     A.   HELCO shall indemnify, defend, and hold harmless SELLER, its
successors, permitted assigns, affiliates, controlling persons, directors,
officers, employees, servants and agents, including but not limited to
contractors and their employees (collectively referred to as an "Indemnified
SELLER Party"), from and against any and all third party claims, demands,
obligations, liabilities (including, without limitation, liabilities arising out
of the doctrine of strict liability), losses, damages, penalties, fines,
actions, suits, judgments, costs, expenses and disbursements (including
reasonable attorney's fees and expenses) and proceedings of any nature
whatsoever for personal injury or death or damage to property, whether or not
well founded, meritorious or unmeritorious, demanded, asserted or claimed
against, imposed upon, or incurred by an Indemnified SELLER Party in any way
relating to or arising out of the performance by HELCO of its obligations under
this Agreement, except to the extent that any of the foregoing is attributable
to the negligence or intentional action of an Indemnified SELLER Party or a
failure of SELLER to comply with Section 3.1B.

     B.   If HELCO shall obtain knowledge of any claim indemnified against under
Section 11.2A or otherwise under this Agreement, HELCO shall give prompt notice
thereof to SELLER, and if SELLER shall obtain any such knowledge, SELLER shall
give prompt notice thereof to HELCO.

     C.   In case any action, suit or proceeding shall be brought against an
Indemnified SELLER Party, SELLER shall notify HELCO of the commencement thereof
and, provided that it has acknowledged in writing to SELLER its obligation to an
Indemnified SELLER Party under this Article XI, HELCO shall be entitled, at its
own expense, acting through counsel acceptable to SELLER, to participate in and,
to the extent that HELCO desires, to assume and control the defense thereof;
provided, however, that HELCO shall not be entitled to assume and control the
- --------  -------                                                            
defense of any such action, suit or proceeding if and to the extent that, in the
opinion of SELLER, such action, suit or proceeding involves the potential
imposition of criminal liability on an Indemnified SELLER Party or a conflict of
interest between an Indemnified SELLER Party and HELCO.  SELLER shall be
entitled, at its own expense, acting through counsel acceptable to HELCO, to
participate in any action, suit or proceeding the defense of which has been
assumed by HELCO.  An Indemnified SELLER Party shall supply HELCO with such
information and documents requested by HELCO as are necessary or advisable for
HELCO to possess in connection with its participation in any action, suit or
proceeding, to the extent permitted by this Section 11.2C.  An Indemnified
SELLER Party shall not enter into any settlement or other compromise with
respect to any claim without the prior written consent of HELCO, which consent
shall not be unreasonably withheld or delayed.

     D.   Upon payment of any claim by HELCO pursuant to Section 11.2C or other
similar indemnity provisions contained herein to or on behalf of SELLER, HELCO,
without any further action, shall be subrogated to any and all claims that an
Indemnified SELLER Party may have relating thereto, and SELLER shall cooperate
with HELCO and give such further assurances as are necessary or advisable to
enable HELCO vigorously to pursue such claims.

                                       75
<PAGE>
 
                      ARTICLE XII - CONSEQUENTIAL DAMAGES


  Neither SELLER nor HELCO shall be liable to the other party for any indirect,
consequential, incidental, punitive or exemplary damages.


                            ARTICLE XIII - INSURANCE

13.1  Required Coverage
      -----------------

     SELLER shall, at its own expense, acquire and maintain, or cause to be
maintained, commencing with the start of construction, as applicable, and
continuing throughout the Term, as applicable, the minimum insurance coverage
set forth in "Attachment J," which SELLER and/or the Financing Parties
reasonably determine, after consultation with HELCO, to be necessary during
construction and operation of the Facility, as long as such coverage is
available to SELLER on commercially reasonable terms.

13.2  Additional Insureds
      -------------------

  The insurance policies specified in Sections (b), (c), (d), (e) and (g) (if
applicable) of "Attachment J" shall include HELCO as an additional insured, as
its interest may appear, with respect to any and all third party bodily injury
and/or property damage claims arising from SELLER's performance of this
Agreement and, to the extent permitted by such insurers after reasonable efforts
of SELLER to obtain such notice, shall require at least thirty (30) days written
notice to HELCO prior to cancellation of, or material modification to such
policy and ten (10) days written notice to HELCO of cancellation due to failure
by SELLER to pay such premium. HELCO acknowledges that Financing Parties shall
be entitled to receive and distribute any and all loss proceeds as stipulated by
any Financing Documents related to any policy described in this Article XIII and
Attachment J.

13.3  Evidence of Policies Provided to HELCO
      --------------------------------------

     Evidence of insurance for the coverage specified in this Article XIII shall
be provided to HELCO within thirty (30) days after SELLER has obtained a copy of
the related policies or by the date specified in Section 2.3A, whichever is
later. During the Term, SELLER, upon HELCO's reasonable request, shall make
available to HELCO for its inspection at SELLER's designated location, certified
copies of the insurance policies described in this Article XIII.

13.4  Deductibles
      -----------

     HELCO acknowledges that any policy required herein may contain reasonable
deductibles or self-insured retentions, the amounts of which are solely within
the discretion of SELLER and/or the Financing Parties.

                                       76
<PAGE>
 
                        ARTICLE XIV - DISPUTE RESOLUTION


14.1  Good Faith Negotiations
      -----------------------

     Before any dispute under this Agreement is subjected to the provisions of
Section 14.2 or any litigation, the presidents, vice presidents, or authorized
delegates from both SELLER and HELCO, each having full authority to settle the
dispute, shall personally meet in Hawaii and attempt in good faith to resolve
the dispute.

14.2  Dispute Resolution Procedures
      -----------------------------

     If the parties are unable to resolve any dispute under this Agreement under
the procedures of Section 14.1, such dispute shall be resolved in Hawaii by
binding arbitration in accordance with the requirements of this Section 14.2;
provided that, this agreement to arbitrate shall be specifically enforceable and
- -------------                                                                   
this Article XIV shall not preclude either party from pursuing its equitable
remedies, including without limitation, seeking injunctive relief.

  A.  Initiation of Arbitration
      -------------------------

     Subject to Section 14.1, either party shall give to the other written
notice in sufficient detail of the existence and nature of any dispute proposed
to be arbitrated under this Section 14.2 and the remedy sought as well as a
detailed statement of its contentions of law and fact. Such notice shall be made
within a reasonable time after the dispute in question arose, and in no event
shall such notice be made after the date when institution of legal or equitable
proceedings based on such dispute would be barred by the applicable statute of
limitations but for this Article XIV. Such notice will be signed by the
president of the party issuing the notice and be delivered to the president of
the other party. The other party shall file an answering statement within twenty
(20) days of receipt of the notice. After the answering statement is filed, the
parties shall diligently negotiate in good faith for a period of sixty (60)
days.

  B.  Appointment of Arbitrator
      -------------------------

     If the dispute is not resolved through the negotiations required by
Section 14.2A, the parties shall attempt to agree on a person with special
knowledge and expertise with respect to the design, construction and operation
of electric generating facilities to serve as an arbitrator panel of one.  If
the parties cannot agree on an arbitrator within twenty (20) days after the
negotiation period required by Section 14.2A, each party shall within five (5)
days, appoint one person to serve as an arbitrator and the two arbitrators thus
appointed shall select a third arbitrator to serve as chairman of the panel of
arbitrators; and such three arbitrators shall determine all matters by majority
vote; provided, however, if the two arbitrators appointed by the parties are
      --------  -------                                                     
unable to agree upon the appointment of the third arbitrator within twenty (20)
days after their appointment, both shall give written notice of such failure to
agree to the parties and, if the parties fail to agree upon the selection of
such third arbitrator within twenty (20) days

                                       77
<PAGE>
 
thereafter, then either of the parties upon written notice to the other may
require such appointment from and pursuant to the rules for commercial
arbitration of the American Arbitration Association.  In selecting arbitrators
under this Section 14.2B, the parties shall give preference to qualified
Hawaiian domiciliaries.

     Each arbitrator appointed pursuant to this Section 14.2B shall swear to
conduct such arbitration in accordance with the terms of this Section 14.2, the
laws of the State of Hawaii, and the Code of Ethics of the American Arbitration
Association.  Each arbitrator who would be disqualified for any reason that
would disqualify a judge under the Code of Judicial Conduct shall immediately
resign or be withdrawn as an arbitrator.  The arbitration panel may choose legal
counsel to advise it on the remedies it may grant, procedures and such other
legal issues as the panel deems appropriate.  Copies of the notice, the
statement of contentions of law and fact, the answering statement and this
Agreement shall promptly be furnished by the initiating party to the
arbitrator(s) selected.

  C.  Arbitration Procedures
      ----------------------

     (1) The parties shall have one hundred and twenty (120) days from the date
of the formation of the arbitration panel to perform discovery and present
evidence and argument to the arbitrators. During this period, the arbitrators
shall be available to receive and consider all such evidence as is relevant,
within reasonable limits due to the restricted time period, and to hear as much
argument as is feasible, giving a fair allocation of time to each party to the
arbitration. This period may be extended for sufficient cause by the arbitration
panel or by agreement of the parties. The arbitration panel shall have the
general powers of a court and may proceed in accordance with established rules
of evidence and procedure, liberally construed to promote justice and
expeditious resolution of the dispute. The arbitration panel shall have complete
discretion over the mode and order of discovery, presentment of evidence, and
the conduct of the hearing. The arbitrators shall not consider any evidence or
argument not presented during such period. To the extent not in conflict with
the procedures set forth in Section 14.2, such arbitration shall be held in
accordance with Hawaii Revised Statutes, Chapter 658, and the prevailing rules
of the American Arbitration Association for commercial arbitration.

     (2) The arbitrators shall use all reasonable means to expedite discovery
and to sanction non-compliance with reasonable discovery requests or any
discovery order. SELLER and HELCO, as the case may be, shall require and warrant
that each of their officers, directors, agents, employees, representatives,
contractors, partners, general partners, limited partners, and all entities that
are the direct or indirect parents or subsidiaries of or an entity affiliated or
related by ownership, in whole or part, with or to SELLER or HELCO, as the case
may be, its partners, general partners, or limited partners, submit to the
jurisdiction of any arbitration panel appointed pursuant to Article XIV and
shall respond to all reasonable discovery requests without challenging or
objecting to the jurisdiction of such arbitration panel, the location of the
arbitration, or other grounds related in any way to separateness of entities, a
lack of privity with HELCO, or their lack of status as a party to this Agreement
or such arbitration. All documents

                                       78
<PAGE>
 
and deponents made available in response to reasonable discovery requests
shall be made available in Hilo, Hawaii.

     (3) At the conclusion of such one hundred and twenty (120) day period, as
extended pursuant to Section 14.2C(1), the arbitrators shall have thirty (30)
days to reach a determination and to give a written decision to the parties,
stating their findings of fact, conclusions of law and final order.

     (4) Pending resolution of disputes pursuant to this Article XIV, which
disputes relate to or impact SELLER's construction schedule for the Facility,
all applicable deadlines and cure periods under this Agreement shall be extended
on a day-for-day basis.

  D.  Arbitrator Limitations
      ----------------------

     The arbitrators shall have authority to interpret and apply the terms and
conditions of this Agreement and to order any remedy allowed by this Agreement,
but may not change any term or condition of this Agreement, deprive either party
of a remedy expressly provided hereunder, or provide any right or remedy that
has been excluded hereunder.

  E.  Decision Binding on the Parties
      -------------------------------

     The decision of the arbitrators shall be binding on the parties at such
time as the decision is confirmed by order of a court of competent jurisdiction
pursuant to Chapter 658, Hawaii Revised Statutes.

  F.  Cost of Arbitration
      -------------------

     The arbitrators in rendering their decision shall also state which party
prevailed over the other party, or that neither party prevailed over the other.
The costs of arbitration (including the attorney fees and costs of the parties
and legal counsel appointed pursuant to Section 14.2B) will be borne by the
party which is not the prevailing party.  In the event neither party prevails,
the parties shall each pay fifty percent (50%) of the cost of the arbitration,
arbitrator/chair of the panel, and any legal counsel appointed pursuant to
Section 14.2B.  Also, in the event neither party prevails, the parties each
shall bear their own costs, including attorney fees, and those of the arbitrator
they appointed to the panel of three arbitrators.


                           ARTICLE XV - FORCE MAJEURE


15.1  Definition
      ----------

     Force Majeure shall mean any storm, hail, flood, lightning, earthquake,
tsunami, volcanic eruption, or other natural disaster, fire and/or explosion,
civil disturbance, labor disputes or strikes, act of a public enemy, sabotage,
war, national emergency or riot, action, inaction, or restraint by any court or
public authority (including denial or failure to grant required permits,

                                       79
<PAGE>
 
licenses, or other authorizations despite timely efforts to obtain same),
inability to obtain required fuel or water for the Facility on reasonable terms
despite reasonable efforts to do so, and changes in applicable United States,
Hawaii, or local environmental, permitting, zoning, land use, or labor laws,
regulations, or ordinances from those in effect on the Execution Date,
Catastrophic Equipment Failure, mechanical or equipment breakdown caused by any
of the foregoing Force Majeure events, or any other cause beyond the reasonable
control of the party relying on such cause to excuse its performance hereunder
to the extent to which such party cannot remedy the problem by exercise of due
diligence, including, but not limited to, the expenditure of all reasonable sums
of money.  For purposes of this Section 15.1, Force Majeure shall include delays
in the issuance of SELLER's permits, including without limitation, the PSD
Permit, beyond the issuance date set forth on Attachment Q, except to the extent
such delay beyond the expected issuance date is the result of SELLER's fault or
negligence.

     Notwithstanding the foregoing, however, Force Majeure does not include any
labor dispute or strike involving operating personnel in excess of seventy-two
(72) hours after the Phase 2 In-Service Date (except that if such labor dispute
or strike continues for more than fourteen (14) days thereafter, such labor
dispute or strike shall constitute a Force Majeure event).

15.2  Notice of Force Majeure
      -----------------------

     A party which desires to claim an event of Force Majeure has occurred which
excuses its obligations under this Agreement shall promptly, upon learning of
such event and ascertaining that it will affect its performance hereunder, give
written notice to the other party, stating the nature of the event, its
anticipated duration and any action being taken to avoid or minimize its effect.
The burden of proof shall be on the party claiming Force Majeure pursuant to
this Article XV.

15.3  Excuse of Obligation; Extension of Milestone Dates and In-Service Date
      ----------------------------------------------------------------------
Deadlines
- ---------

     Any obligation of either party under this Agreement shall be excused only
to the extent and for the period that such party's inability to perform is
caused by one (1) or more Force Majeure events. The party so excused shall make
all reasonable efforts, including all reasonable expenditures of necessary
funds, to cure, mitigate or remedy such Force Majeure event. Any payments due as
compensation for the obligation so excused shall also be excused for so long as
the obligation is not performed due to Force Majeure.

     During the occurrence of one (1) or more Force Majeure events, each
Milestone Date, In-Service Date Deadline and related dates or other applicable
deadline in this Agreement shall be extended on a day-for-day basis until the
end of such Force Majeure event; provided, however, in no event shall Force
                                 --------  -------
Majeure extend any Milestone Date or In-Service Date Deadline for more than nine
(9) months in the case of a single Force Majeure event, or twelve (12) months in
the case of more than one (1) Force Majeure event.

                                       80
<PAGE>
 
15.4  Right to Terminate Due to Force Majeure or Catastrophic Equipment Failure
      -------------------------------------------------------------------------

     Notwithstanding any other provision of this Agreement, if a party is
prevented from substantially performing its obligations under this Agreement by
natural disaster, other Force Majeure or Catastrophic Equipment Failure for a
period of twenty-four (24) consecutive months, the other party may terminate the
Agreement without further liability of either party to the other hereunder. Such
termination shall be effective upon ninety (90) days written notice to the other
party and the Financing Parties prior to the resumption of substantial
performance; provided, however, that if substantial performance is resumed
             --------  -------                                            
during such ninety (90) day period, such termination shall not be effective.

15.5  Obligations Remaining After Event of Force Majeure
      --------------------------------------------------

     No monetary obligations of either party which arose before the occurrence
of an event of Force Majeure causing the suspension of performance shall be
excused as a result of such occurrence. The obligation to pay in a timely manner
any payments owed pursuant to Article V, and any other money for obligations and
liabilities which matured prior to the occurrence of an event of Force Majeure
is absolute and shall not be subject to the Force Majeure provisions. In the
event of a SELLER Force Majeure which reduces or limits the Facility's
capability to deliver capacity and/or energy, HELCO shall be obligated to pay
for capacity and/or energy only to the extent such capacity and/or energy is
made available by SELLER. In the event of a HELCO Force Majeure which reduces or
limits HELCO's capability to purchase energy, HELCO shall pay for such reduced
energy as it may accept, but shall remain obligated to pay for capacity made
available by SELLER in accordance with this Agreement.

15.6  Extension of Term
      -----------------

     If a Force Majeure event occurs after the Phase 2 In-Service Date, the Term
shall be extended on a day-for-day basis for the duration of such Force Majeure
event.

                ARTICLE XVI - ELECTRIC SERVICE SUPPLIED BY HELCO


     This Agreement does not provide for any electric services by HELCO to
SELLER. If SELLER requires any electric services from HELCO, HELCO shall provide
such service on a non-discriminatory basis in accordance with HELCO's
Schedule "J" tariff, a copy of which is attached as Attachment S, or successors
thereof.

                           ARTICLE XVII - ASSIGNMENT

17.1  Assignment by SELLER
      --------------------

  This Agreement shall not be assignable by SELLER without the prior written
consent of HELCO (which consent shall not be unreasonably withheld); provided
                                                                     --------
that SELLER may,
- ----             

                                       81
<PAGE>
 
without the consent of HELCO, assign this Agreement (A) as required by the
Financing Parties or otherwise in connection with Financing Documents or (B) to
an affiliate, a wholly-owned subsidiary or a successor of SELLER.

17.2  Assignment by HELCO
      -------------------

     This Agreement shall not be assignable by HELCO without the prior written
consent of SELLER (which consent shall not be unreasonably withheld); provided
                                                                      --------
that HELCO shall have the right, without the consent of SELLER, to assign its
- ----                                                                         
interest in this Agreement to the Trustee under its First Mortgage Bond
Indenture dated December 1, 1938 as it may be amended from time to time
including the amendment of June 20, 1963, and to any affiliated company owned in
whole or in part by Hawaiian Electric Industries, Inc., provided further that
                                                        ---------------------
such assignment does not impair the ability of SELLER to continue to receive the
payments it is entitled to under this Agreement and, further provided that HELCO
                                                     ------- -------- ----      
will remain directly responsible for any obligations under this Agreement that
only HELCO, as the public utility serving the Island of Hawaii, can carry out.

17.3  Binding on Assigns
      ------------------

     This Agreement and all of its covenants, terms and provisions shall be
binding upon and shall inure to the benefit of and be enforceable by the parties
hereto and their respective successors and assigns.


            ARTICLE XVIII - CHANGE IN COMMITTED CAPACITY OF FACILITY


     After the Phase 2 In-Service Date, SELLER shall not increase the Committed
Capacity of the Facility to more than sixty thousand kilowatts (60,000EkW) (net)
without the prior written approval of HELCO; provided, however, that in no event
                                             --------  -------                  
shall HELCO be obligated to approve a change in Committed Capacity.  Unless
waived by HELCO, any change in Committed Capacity will require that the Facility
undergo the Capacity Test procedure referred to in Section 3.2C(22).


                    ARTICLE XIX - SALE OF FACILITY BY SELLER


19.1  HELCO's Right of First Refusal
      ------------------------------

     Should SELLER ever desire to dispose of its right, title, or interest in
the Facility, in whole or in part, other than the sale and leaseback of the
Facility or other assignment or disposition of part or all of its ownership
interests in the Facility to provide financing for the Facility, it shall first
offer to sell such interest to HELCO. SELLER shall not solicit any offers for
the sale of the Facility with any other entity without first negotiating with
HELCO in good faith for at least ninety (90) days concerning a purchase by HELCO
unless, during that period, HELCO gives written notice that such negotiations
are terminated. Notwithstanding the above, in the event SELLER ceases
negotiations with HELCO and, within one (1) year offers to sell the

                                       82
<PAGE>
 
Facility to a third party for less than the final amount HELCO had offered to
purchase the Facility, HELCO shall have the right to purchase the Facility for
such lower amount on similar terms and conditions; provided that HELCO shall
                                                   -------- ----            
have thirty (30) days in which to accept such terms and conditions.  This
Section 19.1 shall not apply to unsolicited offers received by SELLER or the
sale or transfer of interests in SELLER (except the sale or transfer of 100% of
the interest in SELLER) or a sale or transfer initiated by Financing Parties.

19.2  No Exercise of Right by HELCO
      -----------------------------

     In the event that HELCO does not exercise its right to purchase such
interest in the Facility under Section 19.1, SELLER shall have the right to
transfer or sell such interest to any person or entity which proposes to acquire
the Facility with the intent to continue the operation of the Facility in
accordance with the provisions of this Agreement pursuant to an assignment of
this Agreement, subject to the written approval of HELCO, which approval shall
not be unreasonably withheld. HELCO will grant assignment of this Agreement to
the purchaser upon being reasonably satisfied that the assignee (i) has the
qualifications or has contracted with an entity having the qualifications to
operate the Facility in a manner consistent with the terms and conditions of
this Agreement and (ii) has provided HELCO with adequate assurances of its
creditworthiness and ability to perform its financial obligations hereunder in a
manner consistent with the terms and conditions of this Agreement.


                          ARTICLE XX - ESCROW ACCOUNT


     To the extent permitted by the Financing Parties, SELLER shall grant to
HELCO a security interest in any escrow or reserve accounts established in
connection with financing for the Facility, securing all of SELLER's payment
obligations hereunder. Such security granted by SELLER shall be subordinate to
the rights of the Financing Parties in such accounts to the extent provided for
under Section 3.1E, and shall permit recourse against such accounts by HELCO
only if the Financing Parties having superior rights in such accounts have fully
exercised such rights, received full satisfaction of the obligations secured by
such rights, or provided HELCO with a written waiver or release of such rights.
SELLER shall execute such documents as HELCO shall reasonably request to grant,
establish, perfect and maintain such security interest. HELCO shall execute such
documents as SELLER or Financing Parties shall reasonably request to subordinate
HELCO's interests to that of the Financing Parties.


                            ARTICLE XXI - GUARANTEE


21.1  Guarantee(s)
      ------------

     Guarantor(s) shall be financially responsible for all of SELLER's payment
obligations under this Agreement up to the Guaranteed Amount, including but not
limited to, any penalties, Liquidated Damages, payments due from SELLER to HELCO
under the Interconnection Agreement, and reimbursement of certain HELCO
administrative costs under Article XXII.

                                       83
<PAGE>
 
SELLER shall, at its option, either (i) cause the Guarantor(s) to maintain the
Guarantee(s) pursuant to Section 21.2 in full force and effect throughout the
Term, or (ii) substitute therefor either:

  A.  an unconditional irrevocable direct pay or standby letter of credit in an
amount determined pursuant to Section 21.2 issued by a bank in Hawaii acceptable
to HELCO, in form and substance acceptable to HELCO; or

  B.  a payment bond or performance bond in an amount determined pursuant to
Section 21.2 issued by a company acceptable to HELCO for payment to HELCO in the
event of a breach of this Agreement by SELLER, in form and substance reasonably
acceptable to HELCO.

HELCO shall not be obligated to release the Guarantor(s) from the Guarantee(s)
unless the substitute proposed by SELLER under this Section 21.1 is fully
acceptable to HELCO.

     HELCO's release of the Guarantee(s) shall be terminated and the
Guarantee(s) shall be reinstated at such time as any letter of credit or bond
provided hereunder terminates. In addition, if a letter of credit or bond
supplied hereunder is for less than the entire amount required under Section
21.2, then the Guarantee(s) shall be released only by an amount equal to the
amount of payments covered by such letter of credit or bond.

     Any letter of credit or bond proposed by SELLER as a substitute for the
Guarantee(s) shall provide for payments to HELCO up to the Guaranteed Amount.

21.2  Guaranteed Amount
      -----------------
 
     The Guaranteed Amount (or substitution therefor) shall be according to the
following schedule:
 
         From the PUC Approval Date               $  200,000
         through the Closing Date

         From the Closing Date                    $1,000,000
         through the Phase 2 In-Service Date
 
         From the Phase 2 In-Service Date         $3,000,000
         through the end of the Term


                    ARTICLE XXII - REIMBURSEMENT OF CERTAIN
                           HELCO ADMINISTRATIVE COSTS


     SELLER shall reimburse HELCO for its documented, reasonable out-of-pocket
legal, consulting and administrative costs incurred by HELCO in the course of
securing PUC approval

                                       84
<PAGE>
 
of this Agreement up to fifty thousand dollars ($50,000).  For the purpose of
this Article XXII, HELCO's costs shall commence from the Execution Date and
these costs shall be paid at the Closing Date, to the extent then accrued, with
any additional costs to be paid on or before the Phase 2 In-Service Date.
Payment shall be by wire transfer to HELCO's designated account at the Bank of
Hawaii in Hilo, Hawaii, unless otherwise directed by HELCO.  In the event such
costs remain unpaid in whole or in part, HELCO shall have the right to offset
such unpaid amounts against the initial Capacity Charge payment under this
Agreement and any subsequent Capacity Charge payments until such costs have been
reimbursed in full.


                         ARTICLE XXIII - MISCELLANEOUS

23.1  Recovery of Payments
      --------------------

     No change may be made in the terms and conditions of this Agreement except
by agreement of the parties hereto.  The parties to this Agreement believe, and
have entered this Agreement relying on the belief that, under and pursuant to
PURPA and 18 C.F.R., Part 292, including, without limitation, 18 C.F.R.
292.304(b)(5) and (d)(2), after the PUC Order has become final and non-
appealable: (i) no adjustment in the payments to be paid to SELLER under the
provisions of this Agreement is either appropriate or lawful; and (ii) that,
also in light of the foregoing, it is neither appropriate nor lawful for the PUC
or any successor entity to deny HELCO the recovery of any or all amounts paid to
SELLER pursuant to the terms of this Agreement.  Both parties will extend their
reasonable best efforts to resist and appeal any PUC actions, decisions, or
orders denying or having the effect of denying or otherwise preventing HELCO
from recovering any or all amounts paid to SELLER pursuant to the terms of the
Agreement; provided that HELCO shall reimburse SELLER for any and all reasonable
           -------------                                                        
out-of-pocket expenses incurred in assisting HELCO in accordance with this
Section 23.1.

     Except as specifically provided in Section 2.2 hereof, the PUC's denial of
HELCO's recovery of any amounts paid to SELLER pursuant to the terms of this
Agreement shall have no effect on HELCO's obligations under this Agreement.

23.2  Notices
      -------

     Except as otherwise specified in this Agreement, any notice, demand or
request required or authorized by this Agreement to be given in writing to a
party shall be either personally delivered or mailed by registered or certified
mail (return receipt requested) postage prepaid to such party at the following
address:

  If to SELLER:      Encogen Hawaii, L.P.
                     c/o Enserch Development Corporation
                     1817 Wood Street, Suite #550 - West
                     Dallas, TX  75201
                     Attention:  Vice President - Administration
                     (214) 670-2712 (telephone)

                                       85
<PAGE>
 
                     (214) 670-2974 (fax)

  If to HELCO:       Hawaii Electric Light Company, Inc.
                     P. 0. Box 1027
                     Hilo, Hawaii 96720-1027
                     Attention:  Manager, Production

     The designation of such person and/or address may be changed at any time by
either party upon written notice given pursuant to the requirements of this
Section 23.2.  A notice served by mail shall be effective upon receipt.

23.3  Entire Agreement
      ----------------

     This Agreement, including all attachments, constitutes the entire
understanding between the parties, supersedes any and all previous
understandings between the parties, and binds and inures to the benefit of the
parties, their successors and assigns.  The parties have entered into this
Agreement in reliance upon the representations and mutual undertakings contained
herein and not in reliance upon any oral or written representation or
information provided to one party by any representative of the other party.

23.4  Further Assurances
      ------------------

     If either party determines in its reasonable discretion that any further
instruments, assurances or other things are necessary or desirable to carry out
the terms of this Agreement, the other party will execute and deliver all such
instruments and assurances and do all things reasonably necessary or desirable
to carry out the terms of this Agreement.

23.5  Severability
      ------------

     After the requirements of Section 23.14 have been satisfied, if any term or
provision of this Agreement or the application thereof to any person, entity or
circumstance shall to any extent be invalid or unenforceable, the remainder of
this Agreement, or the application of such term or provision to persons,
entities or circumstances other than those as to which it is invalid or
unenforceable, shall not be affected thereby, and each term and provision of
this Agreement shall be valid and enforceable to the fullest extent permitted by
law.

23.6  No Waiver
      ---------

     The failure of either party to enforce at any time any of the provisions of
this Agreement, or to require at any time performance by the other party of any
of the provisions hereof, shall in no way be construed to be a waiver of such
provisions, nor in any way to affect the validity of this Agreement or any part
hereof or the right of such party thereafter to enforce every such provision.

                                       86
<PAGE>
 
23.7  Modification or Amendment
      -------------------------

     No modification, amendment or waiver of all or any part of this Agreement
shall be valid unless it is reduced to writing and signed by both parties.

23.8  Governing Law and Interpretation
      --------------------------------

     Interpretation and performance of this Agreement shall be in accordance
with, and shall be controlled by, the laws of the State of Hawaii, other than
the laws thereof that would require reference to the laws of any other
jurisdiction.

23.9  Counterparts
      ------------

     This Agreement may be executed in several counterparts and all so executed
counterparts shall constitute one Agreement, binding on both parties thereto,
notwithstanding that both parties may not be signatories to the original or the
same counterpart.

23.10  Computation of Time
       -------------------

     In computing any period of time prescribed or allowed under this Agreement,
the day of the act, event or default from which the designated period of time
begins to run shall not be included.  If the last day of the period so computed
is a Saturday, a Sunday, or a legal holiday in Hawaii, then the period shall run
until the end of the next day which is not a Saturday, a Sunday, or a legal
holiday in Hawaii.  When the period of time prescribed or allowed is less than
seven (7) days, intermediate Saturdays, Sundays, and legal holidays shall be
excluded in the computation.

23.11  Thermal Energy Sales Contract
       -----------------------------

     In the event SELLER intends to qualify as a QF by selling thermal energy,
SELLER shall, subject to compliance with applicable confidentiality agreements,
provide HELCO with a copy of the Thermal Energy Sales Contract(s) (redacted to
delete any confidential or proprietary information), or a certificate to the
effect that such contract(s) will provide for, at a minimum, useful thermal
energy sales under normal operating conditions that are adequate to maintain the
Facility as a Qualifying Facility under PURPA and, in no event shall thermal
energy sales limit or restrict in any way the capability of the Facility or any
portion thereof to operate under HELCO Dispatch in full compliance with the
terms and conditions of this Agreement.  Thereafter, SELLER shall not modify the
Thermal Energy Sales Contract in a manner that would materially adversely impact
its ability to perform its obligations hereunder.

23.12  Review of Financing Documents; Project Financing
       ------------------------------------------------

     The parties acknowledge that SELLER intends to obtain construction and term
project financing for the Facility and that Financing Parties providing such
financing will require the financing to be secured by liens upon the Facility
and other assets of SELLER, including a

                                       87
<PAGE>
 
collateral assignment of this Agreement, the Interconnection Agreement and other
Project Documents and all rights and obligations of SELLER hereunder and
thereunder.  HELCO shall execute and deliver on or before the Closing Date a
consent to assignment of this Agreement and other related agreements ("Consent
to Assignment"), and any other documents necessary to create a valid collateral
assignment hereof to the Financing Parties, and shall cooperate with reasonable
requests of the Financing Parties in connection with the documentation of any
financing or refinancing with respect to the Facility, including execution and
delivery of other customary certificates, instruments and opinions.  The Consent
to Assignment shall include, among other things, provisions giving the Financing
Parties reasonably acceptable notice of and opportunity and right to cure any
breach or event of default under this Agreement or the Interconnection
Agreement, and shall contain terms and conditions (including notice and cure
rights) generally required by lenders of long-term, non-recourse project loans,
which terms and conditions shall be reasonably satisfactory to Financing Parties
and HELCO.

     To the extent permitted by the Financing Parties, SELLER shall provide
HELCO with summaries of the key terms of the Financing Documents, amendments or
modifications thereto, and any documents providing for a refinancing which would
materially impact HELCO.

23.13  Confidential and Proprietary Information
       ----------------------------------------

     If and to the extent any information or documents furnished by one party to
the other under this Agreement are confidential or proprietary to the furnishing
party, the receiving party shall treat the same as such and shall take
reasonable steps to protect against the unauthorized use of disclosure of the
same; provided, however, that such information and documents are conspicuously
      --------  -------                                                       
marked or otherwise clearly identified as confidential or proprietary when
furnished; and provided further that this sentence shall not apply to (i) any
               -------- -------                                              
information or documents which are in the public domain, known to the receiving
party prior to receipt from the other party, or acquired from a third party
without a requirement for protection or (ii) any use or disclosure required by
any law, rule, regulation, order or other requirement of any governmental
authority having jurisdiction.  All other information and documents furnished
under this Agreement shall be furnished on a non-confidential basis.

23.14  PUC Approval
       ------------

     The parties acknowledge and agree that this Agreement, and any amendments,
supplements or related instruments thereto, is subject to approval by the PUC
and the parties' respective obligations hereunder are conditioned upon receipt
of such approval, except as specifically provided otherwise herein.  Upon
execution of this Agreement, the parties shall use their best efforts to obtain,
on an expedited basis, an order from the PUC (the "PUC Order") that does not
contain terms and conditions deemed to be unacceptable to the parties, and in a
form deemed to be reasonable by the parties ordering that:

     (1) this Agreement is approved;

     (2) the Interconnection Agreement is approved;

                                       88
<PAGE>
 
    (3) the purchased power costs to be incurred by HELCO as a result of this
Agreement are reasonable;

    (4) the buyout and deferral clauses, Sections 3.3B and 3.3C of this
Agreement respectively, are reasonable;

    (5)  HELCO's purchased power arrangements under this Agreement, pursuant to
which HELCO will purchase energy and Firm Capacity from SELLER, are prudent
and in the public interest;

    (6) increases and decreases in the purchased energy costs to be incurred by
HELCO pursuant to this Agreement may be included in HELCO's Energy Cost
Adjustment Clause during the Term of the Agreement;

    (7) HELCO may include the power purchase costs incurred by HELCO pursuant to
this Agreement, including Capacity Charge payments and Energy Charge payments in
HELCO's revenue requirements for ratemaking purposes and for the purposes of
determining the reasonableness of HELCO's rates during the Term of this
Agreement; and

     (8) in accordance with the request made by the parties pursuant to Section
3.2C(27)(viii), SELLER will not be considered a "public utility" subject to
regulation by the PUC in the event the Facility loses its QF status due to
Simple Cycle operation requested by HELCO.


23.15  Change in Standard System or Organization
       -----------------------------------------

  A.  Consistent With Original Intent
      -------------------------------

     If, during the Term of this Agreement, any standard, system or organization
referenced in this Agreement should be modified or replaced in the normal course
of events, such modification or replacement shall from that point in time be
used in this Agreement in place of the original standard, system or
organization, but only to the extent such modification or replacement is
generally consistent with the original spirit and intent of this Agreement.

  B.  Eliminated or Inconsistent With Original Intent
      -----------------------------------------------

     If, during the Term of this Agreement, any standard, system or organization
referenced in this Agreement should be eliminated or cease to exist, or is
modified or replaced and such modification or replacement is inconsistent with
the original spirit and intent of this Agreement, then in such event the parties
will negotiate in good faith to amend this Agreement to a standard, system or
organization that would be consistent with the original spirit and intent of
this Agreement.

                                       89
<PAGE>
 
23.16  No Party Deemed Drafter
       -----------------------

     No party shall be deemed the drafter of this Agreement. If this Agreement
is ever construed by a court of law, such court shall not construe this
Agreement or any provision hereof against any party as the drafter.


23.17  Headings
       --------

     The Table of Contents and paragraph headings of the various sections have
been inserted in this Agreement as a matter of convenience for reference only
and shall not modify, define or limit any of the terms or provisions hereof and
shall not be used in the interpretation of any term or provision of this
Agreement.



                       (Signatures on the Following Page)

                                       90
<PAGE>
 
     IN WITNESS WHEREOF, HELCO and SELLER have caused this Agreement to be
executed by their respective duly authorized officers as of the date first above
written.

                       HELCO:  HAWAII ELECTRIC LIGHT COMPANY, INC.


                               By: /s/ T. Michael May
                                   ------------------------------
                               Its: Chairman of the Board
                                   ------------------------------

                               By: /s/ Warren H. W. Lee
                                   ------------------------------
                               Its: President
                                   ------------------------------


                       SELLER: ENCOGEN HAWAII, L.P.

                               By:  ENSERCH DEVELOPMENT CORPORATION
                                    HAWAII, INC.
                                    Managing General Partner

                               By:  /s/ Allan V. Smith
                                   ------------------------------
                                    Name: Allan V. Smith
                                    Title: Senior Vice President
                                   

                                       91
<PAGE>
 
                                 ATTACHMENT A
                          DIAGRAM OF INTERCONNECTION
       (See definitions of Metering Point and Point of Interconnection)
                     [Provided as Exhibit 1 to Schedule 1
                         of Interconnection Agreement]


                                      A-1
<PAGE>
 
Attachment A (drawing):
- -----------------------
ENCOGEN/HELCO Interconnection Agreement: one line diagram of interconnection
facilities and the new transmission line
<PAGE>
 
                                 ATTACHMENT B
                               MILESTONE EVENTS
                   (See Sections 2.4A(1), 2.4A(2), 3.2A(2))

<TABLE> 
<CAPTION> 



     EVENT                                                                MONTHS AFTER             
     -----                                                              PUC APPROVAL DATE          
                                                                        -----------------          
<S>                                                                     <C>                         


- -    Application for all Construction                                         3 months
     Permits Filed                                                                    
                                                                                      
- -    Construction start (pouring of foundation for the first CT)              6 months 
</TABLE> 

<TABLE> 
<CAPTION> 

     EVENT                                                               MONTHS AFTER    
     -----                                                              PUC ORDER DATE              
                                                                        --------------              
<S>                                                                     <C> 

- -    Receipt of final (appeals exhausted)                                     4 months 
     PSD/Covered Source Permit
</TABLE> 

                                      B-1
<PAGE>
 
                                 ATTACHMENT D
                        FACILITY FUNCTIONAL DESCRIPTION
                              (See Section 2.1B)


The Facility is located on the Site near Haina, Hawaii.  The Facility employs
two (2) combustion turbines, two (2) heat recovery steam generators, and a steam
turbine in combined cycle mode.  Output from each generator will be produced at
13.8kV and transformed to 69kV for sale to HELCO.  The Facility will utilize
four (4) mechanical forced draft cooling towers.  The Facility will utilize low
sulfur fuel to mitigate SO\\x\\emissions, and water injection and selective
catalytic reduction to mitigate NO\\x\\ emissions.

Fuel will be delivered by tank trucks to aboveground storage tank(s) with an
approximate capacity of seventy-seven thousand (77,000) barrels.  The annual
consumption is expected to be approximately seven hundred thousand (700,000)
barrels.

The Facility will be designed to meet the requirements for starting times, ramp
rates, and quick load pickup specified in Section 3.2C.

It is expected that thermal energy in the form of steam and/or heated water will
be produced and sold to other customer(s) pursuant to one (1) or more Thermal
Energy Purchase Agreement(s).


                                      D-1
<PAGE>
 
                                  ATTACHMENT F
                         FACILITY LOCATION AND LAYOUT
                              (See Section 2.1C)


                                      F-1
<PAGE>
 
Attachment F (drawing):
- -----------------------
Facility location and layout dated July 10, 1997.
<PAGE>
 
                                 ATTACHMENT G
                SUMMARY OF MAINTENANCE AND INSPECTION PERFORMED
                            IN PRIOR CALENDAR YEAR
                             (See Section 3.2B(5))

<TABLE>
<CAPTION>
 
 
<S>                             <C>
DATE WORK ORDER SUBMITTED:      06/28/96
WO#:                            11451
EQUIPMENT #:                    1CCF-TNK-1
EQUIPMENT DESCRIPTION:          AMMONIA STORAGE TANK 1
PROBLEM DESCRIPTION:            PURCHASE EMERGENCY ADAPTER FITTINGS FOR UNLOADING GASPRO TANKS TO STORAGE TANK
 
WORK PERFORMED:                 PURCHASED THE NEW ADAPTERS AND VERIFIED THEIR OPERATION.
 
COMPLETION DATE:                06/28/96
WORK ORDER COMPLETED BY:        AA
 
          ----------------END OF CURRENT WORK ORDER----------------
  
DATE WORK ORDER SUBMITTED:      05/19/96
WO#:                            11136
EQUIPMENT #:                    1WSA-BV-12
EQUIPMENT DESCRIPTION:          MAKE-UP PI ISOLATION
PROBLEM DESCRIPTION:            'D' MAKE-UP PUMP PI ISOLATION FITTING LEAKING ON SPOOL SIDE
 
WORK PERFORMED:                 REMOVED AND REPLACED FITTINGS AND FLANGES WITH STAINLESS STEEL.  THIS WORK WAS DONE DURING PUMP
                                OVERHAUL ON WO 1374.  JH
 
COMPLETION DATE:                06/28/96
WORK ORDER COMPLETED BY:        BB
</TABLE>

          ----------------END OF CURRENT WORK ORDER----------------

                                      G-1
<PAGE>
 
                                  ATTACHMENT H
                      QUALIFIED INDEPENDENT ENGINEERS LIST
                               (See Section 3.3D)
 
 
Black & Veatch                              R. W. Beck
8400 Ward Parkway                           2101 Fourth Avenue
P. O. Box 8405                              Suite 600
Kansas City, Missouri  64114                Seattle, WA  98121-2375
Phone: (913) 339-2530                       Phone: (206) 441-7500 
FAX:   (913) 339-2934                       Fax:   (206) 441-4962 
 
Burns & McDonnell
4800 East 63rd Street
Kansas City, Missouri 64130
Phone: (816) 822-3091
FAX:   816-333-3690
 
Parsons Brinckerhoff Energy Services, Inc.
303 Second Street, Suite 850
San Francisco, CA  94107-1368
Phone: (415) 281-8700
FAX:   (415) 281-8707
 
Raytheon
3000 W. MacArthur Boulevard
Santa Ana, CA  92701
Phone: (714) 662-4000
FAX:   (714) 662-4048
 
Sargent & Lundy
55 East Monroe Street
Chicago, Illinois  60603-5780
Phone: (312) 269-2246
FAX:   (312) 269-3146
 
Stone & Webster Engineering Corporation
7677 East Berry Avenue
Englewood, Colorado  80111-2137
Phone: (303) 741-7103
FAX:   (303) 741-7670

                                      H-1
<PAGE>
 
                                 ATTACHMENT I
                             ADJUSTMENT OF CHARGES
                    (See Sections 3.2C(23), 3.2J, 5.1, 8.4)

Charges subject to adjustment based on GDPIPD will be adjusted by the following
formula:

 
New Charge = Base Charge x GDPIPD\\CURRENT\\
                           -----------------
                            GDPIPD\\BASE\\
 
     where
 
<TABLE> 
<CAPTION> 

<S>                                  <C> 
          New Charge          =      adjusted charge
                              
          Base Charge         =      charge (in dollars) calculated per this Agreement
                              
          GDPIPD\\CURRENT\\   =      GDPIPD, as adjusted, in effect at the time the energy is delivered
                              
          GDPIPD\\BASE\\      =      The "Final" GDPIPD for the Third Quarter of the year prior to the Reference Year.
</TABLE>

An adjustment shall be made on each January 1 equal to one hundred percent
(100%) of the percentage change between the "Final" Third Quarter Reference Year
GDPIPD ("GDPIPD\\BASE\\") and the previous year's Third Quarter "Final" GDPIPD
value.

When adjusting the charges subject to adjustment based on GDPIPD, the adjustment
shall first apply to the energy delivered by SELLER to HELCO in the month of the
adjustment date (January 1) and then invoiced for payment in the following
month.

For purposes of this Attachment, the term "Reference Year" refers to the base
year specifically referred to within the Agreement as the starting point for
escalation.

                                      I-1
<PAGE>
 
                                 ATTACHMENT J
                              REQUIRED INSURANCE
                              (See Article XIII)


     (a) Worker's Compensation and Employers' Liability.  This coverage shall
         ----------------------------------------------                      
include worker's compensation, temporary disability and other similar insurance
required by applicable Hawaii state or U.S. federal laws.  If exposure exists,
coverage required by the Longshore and Harbor Worker's Compensation Act (33
U.S.C. (S) 688) shall be included.  Additionally, coverage under this subsection
shall include a Voluntary Compensation and Employers' Liability endorsement for
employees not subject to the Workers' Compensation laws.  Employers' Liability
coverage limits shall be no less than:

          Bodily Injury by Accident -   $1,000,000 each Accident
          Bodily Injury by Disease  -   $1,000,000 each Employee
          Bodily Injury by Disease  -   $1,000,000 policy limit

     (b) General Liability Insurance.  This coverage shall include either
         ---------------------------                                     
Comprehensive General Liability, Commercial General Liability Insurance or the
reasonable equivalent thereof, covering all operations by or on behalf of
SELLER.  Such coverage shall provide insurance for bodily injury and property
damage liability for the limits of liability indicated below and shall include
coverage for:

          (1) Premises, operations, and mobile equipment,

          (2) Products and completed operations,

          (3) Owners and contractors protective liability,

          (4)  Contractual liability,

          (5) Broad form property damage (including completed operations),

          (6) Explosion, collapse and underground hazard, and

          (7)  Personal injury liability.

          Limits of liability for such coverage, which may be provided with
umbrella and/or excess insurance coverage, shall be:

<TABLE>
<CAPTION>

<S>                                               <C>  
Bodily Injury & Property Damage                   $20,000,000 per occurrence and
                                                  $20,000,000 aggregate annually
</TABLE>

     (c) Automobile Liability Insurance.  This insurance shall include coverage
         ------------------------------                                        
for owned, leased and non-owned automobiles.  The limits of liability shall be a
combined single limit for

                                      J-1
<PAGE>
 
bodily injury and property damage of Two Million Dollars ($2,000,000) for each
occurrence and in the aggregate annually.  If general liability insurance is
provided by a commercial general liability policy, then such general liability
policy shall include coverage for automobile contractual liability as required
under this item (c).

     (d) Builders All Risk Insurance.  This insurance shall include coverage for
         ---------------------------                                            
earthquake and flood perils including transit (excluding ocean transit),
testing, incidental storage, structures, buildings, improvements and temporary
structures used in construction, or part of the permanent Facility from the
start of construction through the earlier of the End of Phase 2 Start-Up or the
effective date of the policy coverage set forth in paragraph (e).  The amount of
coverage shall be purchased on a full replacement cost basis, and the sublimits
for earthquake and flood perils shall be 40% of replacement cost at such time up
to Twenty Million Dollars ($20,000,000), if such insurance amounts are available
on commercially reasonable terms.  The coverage shall be written on a standard
"ISO" "All Risks" completed value form or equivalent and may allow for
reasonable other sublimits including, but not limited to, One Million Dollars
($1,000,000) for transit and Five Million Dollars ($5,000,000) for incidental
offsite storage.  Coverage shall be extended to include testing.

     (e) All Risk Property/Comprehensive Boiler and Machinery Insurance (Upon
         --------------------------------------------------------------------
Completion of Construction).  This insurance shall provide All Risk Property
- --------------------------                                                  
Coverage (including the perils of earthquake and flood) and Comprehensive Boiler
and Machinery Coverage against damage to the Facility.  The amount of coverage
shall be purchased on a full replacement cost basis and the sublimits for
earthquake and flood perils shall be no less than Twenty Million Dollars
($20,000,000), if such insurance amounts are available on commercially
reasonable terms.  Such coverage may allow for other reasonable sublimits.  Such
policies shall be endorsed to require that the coverage afforded shall not be
canceled (except for nonpayment of premiums) or reduced without at least thirty
(30) days prior written notice to SELLER and HELCO, provided, however, that such
                                                    --------  -------           
endorsement shall provide (i) that the insurer may not cancel the coverage for
non-payment of premium without giving SELLER and HELCO five (5) days notice that
SELLER has failed to make timely payment thereof, and (ii) that, subject to the
consent of the Financing Parties, SELLER or HELCO shall thereupon have the right
to pay such premium directly to the insurer.

     (f) Business Interruption Insurance (Upon Completion of Construction).
         -----------------------------------------------------------------  
This insurance shall provide coverage for all of SELLER's costs to the extent
that they would not be eliminated or reduced by the failure of the Facility to
operate for a period of at least twelve (12) months following a covered physical
damage loss deductible period or reasonable dollar deductible.

     (g) Project Liability Errors and Omissions.  SELLER shall be adequately
         --------------------------------------                             
protected against project liability errors and omissions on account of negligent
actions or inactions of architects, engineers, contractors and subcontractors
involved in the construction of the Facility.  This protection may be provided
through any one or more of the following mechanisms:  (i) construction
contract(s) with the above parties who have sufficient financial
creditworthiness


                                      J-2
<PAGE>
 
to cover project liability errors and omissions; (ii) other agreement(s) with
the above parties; or (iii) reserve account(s) which may be used to correct
material deficiencies associated with the Facility as a result of negligent
actions or inactions of the above parties.

     (h) Ocean Transit.  SELLER shall take reasonable action to ensure that the
         -------------                                                         
risk of loss or damage to any material items of equipment which are subject to
ocean transit is adequately protected against by the terms of delivery from
contractors or suppliers of such equipment or SELLER's own insurance coverage.

                                      J-3
<PAGE>
 
                                 ATTACHMENT K
                     CALCULATION OF RAMP DERATING PENALTY
                              (See Section 8.1C)
<TABLE> 
<CAPTION> 


Example:
<S>                                                   <C>   
     Capacity Charge Rate                             $0.01981/kWh

     Unit capacity                                    25 MW

     Unit capacity during ramp derating period        21.5 MW

     Ramp derating                                    3.5 MW

     Duration of ramp derating period                 48 hours
</TABLE> 
 
 
Penalty    =     $0.01981/kWh x 3,500 x 48
 
           =     $0.01981 x 3,500 x 48
 
           =     $3,328.08

                                      K-1
<PAGE>
 
                                 ATTACHMENT L
                          CAPACITY TESTING PROCEDURES
                            (See Section 3.2C(22))


I.   Initial Acceptance Tests
     ------------------------

     A.   When Phase 1 and Phase 2 of the Facility are ready for their
respective Initial Acceptance Test, SELLER shall notify HELCO at least seven (7)
days prior to such test and shall coordinate with HELCO.  SELLER shall perform
and HELCO shall monitor such test no earlier than seven (7) days of HELCO's
receipt of such notice.

     B.   The Initial Acceptance Test shall be performed for each of Phase 1 and
Phase 2 as follows:

          (1) The test shall last for forty-eight (48) hours and shall be
scheduled on the start-up plan provided by SELLER to HELCO in accordance with
Section 5.1.

          (2) During the test period, the Facility shall operate in accordance
with the Dispatch instructions of HELCO's System Operator, subject in all cases
to Good Engineering and Operating Practices and the safety and design limits of
the Facility as specified by the applicable equipment manufacturers.

          (3) If SELLER and HELCO are satisfied with the Initial Acceptance
Test, Firm Capacity shall be designated by SELLER up to the minimum average
capacity level that the Facility is able to sustain over a fifteen (15) minute
interval in which the Facility is being dispatched at maximum capacity; provided
                                                                        --------
that SELLER may not without HELCO's consent, set the Firm Capacity at a level in
- ----                                                                            
excess of  the Committed Capacity.

          (4) If either SELLER or HELCO reasonably believes that an abnormal
condition occurred which may have adversely impacted the Initial Acceptance
Test, such party may request a re-test at such party's expense.

          (5) If, following two re-tests, the parties cannot agree that such
Initial Acceptance Test produced accurate and reliable results, the parties
shall hire a Qualified Independent Engineer, from the list set forth in
Attachment H, to observe a third test and declare the Firm Capacity.  The cost
of such Qualified Independent Engineer shall be shared equally by the parties.

          (6) The parties shall not hire a Qualified Independent Engineer if
following two or more re-tests both parties agree that such Initial Acceptance
Test produced inaccurate or unreliable results; provided that the provisions
                                                -------------               
regarding the hiring of a Qualified Independent Engineer shall apply if the
parties fail to agree to the results of any subsequent test.

                                      L-1
<PAGE>
 
          (7) If SELLER is unable to complete the Initial Acceptance Test or a
subsequent test for any reason, it shall be permitted to re-conduct such test.

     C.   If SELLER's acceptance test under its construction contract includes
the requirements set forth for the Initial Acceptance Tests provided hereby, and
HELCO has an adequate opportunity to monitor such test, the Facility shall, upon
passing such acceptance test, be deemed to have passed the Initial Acceptance
Test provided herein, without the need to conduct a separate test.

II.  Subsequent Capacity Tests.
     ------------------------- 

     The procedures set forth for Initial Acceptance Tests shall apply to any
subsequent Capacity Test, except that (1) such test shall last twenty-four (24)
hours; (2) such test shall be observed by appropriate qualified HELCO personnel;
and (3) during such test, HELCO shall also, if appropriate, test the ramp rates
of the Facility, all in accordance with Section 3.2 of this Agreement and Good
Engineering and Operating Practices.


                                      L-2
<PAGE>
 
                                 ATTACHMENT M
                             UNIT INCIDENT REPORT
                             (See Section 3.2B(4))

Unit:  _________________  Date:  __________  No. _________________

<TABLE>
<CAPTION>
                 Plant           CT 1           CT 2            ST
                 -------------------------------------------------------
<S>              <C>             <C>            <C>             <C> 
                                                                          [ ] Unit Trip
Start                                                                     [ ] Test
- -----------------------------------------------------------------------
                                                                          [ ] Forced Outage
End                                                                       [ ] Fail To Start
- ----------------------------------------------------------------------- 
                                                                          [ ] Risk Condition
Duration                                                                  [ ] Force Majeure
- -----------------------------------------------------------------------
                                                                          [ ] Other
Derating                                                                  [ ] Derating
- -----------------------------------------------------------------------
</TABLE>

     The on-duty Control Room Operator is responsible for the completion of this
     report each time a unit experiences an unplanned Shutdown, Start Failure or
     Derating.  Attach Trip Log and Sequence of Events Log to this report for
     unit trips or when appropriate.  Before resetting alarms and relays, verify
     that all alarms and protective relay actions are listed on the printout.
     If not listed, record them and attach to report.

<TABLE>
<S>                                 <C>              <C>             <C> 
Unit Status Prior to Incident:       [ ] Start-Up    Load:           _________
                                     [ ] On-Line     Voltage:        _________
 
Load:                               [ ] Constant     Type of Fuel:   [ ] Diesel
                                    [ ] Increasing                   [ ] Other
                                    [ ] Decreasing                   [ ]
 
Cause of Incident:                  [ ] HRSG Trip___________________________
                                    [ ] Turbine Trip   ____________________________
                                    [ ] Generator Trip  ___________________________
</TABLE> 

<TABLE> 
<CAPTION> 

Derating:
<S>         <C>                           <C>               <C> 
  CT1 _____ Derated MW output  __________ Hours  __________ MW hours(MW*Hrs)
  CT2 _____ Derated MW output  __________ Hours  __________ MW hours(MW*Hrs)
  ST ______ Derated MW output  __________ Hours  __________ MW hours(MW*Hrs)
</TABLE> 

Brief Explanation of Incident:

______________________________________________________________________________

______________________________________________________________________________


                                      M-1
<PAGE>
 
______________________________________________________________________________

______________________________________________________________________________

______________________________________________________________________________

Control Room Operator:    __________________  Date/Time:    _________________

Lead Technician On Duty:  __________________  Area Leader:  _________________


                                      M-2
<PAGE>
 
UNIT INCIDENT REPORT (PAGE 2)


Corrective Action Taken:

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________



_____________________________________________   ____________________________
  (Plant Manager)

                                      M-3
<PAGE>
 
                                 ATTACHMENT N
                            [INTENTIONALLY OMITTED]


                                      N-1
<PAGE>
 
                                 ATTACHMENT O
                               DESIGN MATERIALS

  . Site Plan

  . General Arrangement Layout

  . Plant Description

  . Preliminary Equipment List                                         
                                                                       
  . Preliminary Design and Specifications for Following Major Equipment 
    Components
       .   Combustion Turbine/Generators               
       .   Heat Recovery Steam Generators              
       .   Steam Turbine/Generator                     
       .   Main Step-Up Transformers                   
       .   Cooling Tower                               
       .   Black Start Generator                       
       .   Boiler Feedwater Pumps                      
       .   Water Treatment System                       

                                      O-1
<PAGE>
 
                                  ATTACHMENT P
                       SAMPLE ENERGY PAYMENT CALCULATION


After Phase 2 In-Service Date

Assumptions:

1. During May 1997, the Facility generated electricity during six 15-minute
   periods (total 1.5 hours).
2. The final 3rd quarter 1995 GDPIPD (GDPIPD\\BASE\\) is 107.8 (see United
   States Department of Commerce News report BEA 96-05, Gross Domestic Product:
   Third Quarter 1995 (Final), Table 4).
3. The final 3rd quarter 1996 GDPIPD (GDPIPD\\CURRENT\\) is 109.9 (see United
   States Department of Commerce News report BEA 96-40, Gross Domestic Product:
   Third Quarter 1996 (Final), Table 4).
4. The Facility\\PRICE\\ (HELCO's total cost of delivered No. 2 fuel oil at
   Keahole) is 599.84 cents/mmBtu (see HELCO's Energy Cost Adjustment (ECA)
   Filing effective May 1, 1997, copy attached as P-3 and P-4).
5. Calculations regarding operation of the Facility are for illustrative
   purposes only; simple cycle operation of 2 CTs is not expected in normal
   operations.

A.  Calculation of Fuel Component\\BASE\\ and Fuel Component

<TABLE>
<CAPTION>                                                                 Fuel Component\\BASE\\     
                                                                               rate ($/kWh)          
 15-min.       Facility Dispatch        Integrated                         (Applicable Equation)     
  period           CT1 or CT2            Load (L)            kWh           (rounded to 6 decimal       Fuel Component\\BASE\\($) 
  ending     (Applicable Equation)         (kW)           Purchased               places)            (rounded to 6 decimal places)
- ----------   ----------------------   ---------------   -------------   ---------------------------  -----------------------------
<S>          <C>                      <C>               <C>             <C>                          <C>
0015         1 CT CC                       11,000            2,750                0.050358                     138.484500
             CT1                                                                (Equation 3)                               
             (Equation 3)                                                                                                
                                                                                                                         
0345         1 CT SC                        5,000            1,250                0.083555                     104.443750
             CT1                                                                (Equation 5)                               
             (Equation 5)                                                                                                
                                                                                                                         
0500         2 CT SC                       13,000            3,250                                             251.995500
             CT1                            7,000            1,750                0.075810                     132.667500
             CT2                            6,000            1,500                0.079552                     119.328000
             (Equation 6)                                                       (Equations 5)                             
                                                                                                                         
1600         2 CT CC                       56,000           14,000                                             531.490250
             CT1 + ST                      29,000            7,250                0.038074                     276.036500
             CT2 + ST                      27,000            6,750                0.037845                     255.453750
             (Unequal dispatch                                                  (Equations 3)                             
             requested; Equation 7)                                                                                     
                                                                                                                         
1830         2 CT CC                       60,000           15,000                0.034918                     523.770000
             (Equation 1)                                                       (Equation 1)                               
                                                                                                                         
2315         2 CT CC                       23,000            5,750                0.043774                     251.700500 
             (Dispatch between                                                  (Equation 2)   
             16 and 24 MW;
             Equation 2)
</TABLE>

                                      P-1
<PAGE>
 
  Total kWh purchased from facility = 42,000 kWh
  Total Fuel Component\\BASE\\ = $1,801.884500
  Fuel Component =  Fuel Component\\BASE\\ x Facility\\PRICE\\ / Fuel\\BASE\\
                 =  $1,801.884500 x 5.9984 / 4.35324
                 =  $2,482.85

  B.  Calculation of Variable O&M Component\\BASE\\ and Variable O&M Component

      (i)  Calculation of Variable Component
           Variable Component = $0.00092/kWh x 42,000 kWh = $38.640000 (1995 $)

      (ii) Calculation of Overhaul Component
           Total CT1 operating hours (from Part A) = 1.5 hours
           Total CT2 operating hours (from Part A) = 1.0 hour
           CT1 Overhaul Component = $103.43/hour x 1.5 hours = $155.145000 
           (1995 $)
           CT2 Overhaul Component = $103.43/hour x 1.0 hour = $103.430000 
           (1995 $)
           Total Overhaul Component = $258.575000 (1995 $)

           Variable O&M Component\\BASE\\ = Variable Component + Overhaul 
                                            Component = $297.215000 (1995 $)
           Variable O&M Component  = Variable O&M Component\\BASE\\ x 
                                     GDPIPD\\CURRENT\\ / GDPIPD\\BASE\\
                                   = $297.215000 x 109.9 / 107.8 = $303.00

  C.  Calculation of Energy Charge

      Energy Charge  =  (Fuel Component + Variable O&M Component) x (.98)
                     =  (2,482.85 + 303.00) x (.98)
                     =  $2,730.13

                                      P-2
<PAGE>
 
97055.xls                                                           ATTACHMENT 2
ECA


                      HAWAII ELECTRIC LIGHT COMPANY, INC.
                      ENERGY COST ADJUSTMENT (ECA) FILING
<TABLE>
<CAPTION>
 Line                                                            Line   PURCHASED ENERGY COMPONENT
 ----                                                            ----   --------------------------
<S>       <C>                                                    <C>    <C>                                        <C>
   1      Effective Date           May 1, 1997                          PURCHASED ENERGY PRICE, cents/kwh
          Supercedes Factors of April 21, 1997                     27   HCPC (Contract)-Off Peak                   5.150
                                                                   28                  -On Peak                    6.210
                                                                   29   Not Used                                   0.000
                                                                   30   PGV - Off Peak                             5.470
                                                                   31       - On Peak                              6.610
          HELCO GENERATION COMPONENT                               32   PGV - Off Peak          Addl Contract      3.829
          --------------------------                               33       - On Peak           Addl Contract      4.829
          FUEL PRICES, cents/mmbtu                                 34   Wailuku Hydro - Off Peak                   5.970
   2      Hilo Industrial                           309.94         35                 - On Peak                    7.240  
   3      Puna Industrial                           322.20         36   Other (greater than 100KW)  - Off Peak     5.987  
   4      Keahole Diesel                            599.84         37                               - On Peak      7.247  
   5      Waimea Diesel                             591.19         38   Other (less than 100 KW)                   5.950  
   6      Hilo Diesel                               575.80
   7      Puna Diesel                               576.84              PURCHASED ENERGY KWH MIX, %
   8      Wind                                        0.00         39   HCPC (Contract)-Off Peak                   11.96
   9      Hydro                                       0.00         40                  -On Peak                    16.77
                                                                   41   Not Used                                    0.00
          BTU MIX, %                                               42   PGV - Off Peak                             21.84
  10      Hilo Industrial                            44.36         43       - On Peak                              30.59
  11      Puna Industrial                            17.61         44   PGV - Off Peak          Addl Contract       0.00
  12      Keahole Diesel                              6.13         45       - On Peak           Addl Contract       6.44
  13      Waimea Diesel                               0.31         46   Wailuku Hydro - Off Peak                    3.56
  14      Hilo Diesel                                 1.68         47                 - On Peak                     4.98
  15      Puna Diesel                                26.09         48   Other (greater than 100KW)  - Off Peak      1.25
  16      Wind                                        0.73         49                               - On Peak       2.58
  17      Hydro                                       3.09         50   Other (less than 100 KW)                    0.03
                                              ------------                                                   -----------
                                                    100.00                                                        100.00
                                              ------------                                                   -----------
  18      COMPOSITE COST OF GENERATION,                            51   COMPOSITE COST OF PURCHASED
           cents/mmbtu                              393.00               ENERGY, cents/kwh                         6.022
  19      % input to System kwh Mix                  58.03         52   % Input to System kwh Mix                  41.97
  20      Efficiency Factor, mmbtu/kwh            0.014909         53   WEIGHTED COMP. PURCH. ENERGY
  21      WEIGHTED COMPOSITE GEN COST,                                  COST cents/kwh (lines (51x52))           2.52743
           cents/kwh (lines (16x17x18))            3.40012
                                                                   54   BASE PURCHASED ENERGY
  22      BASE GEN. COST, cents/mmbtu               376.37               COMPOSITE COST, cents/kwh                 5.940
  23      Base % Input to Sys kwh Mix                61.55         55   Base % Input to Sys kwh Mix                38.45
  24      Efficiency Factor, mmbtu/kwh            0.014909         56   WEIGHTED BASE PURCH ENERGY
  25      WEIGHTED BASE GEN COST,                                        COST, cents/kwh (lines (54x55))         2.28393
           cents/kwh (lines (20x21x22))            3.45376
                                                                   57   COST LESS BASE (line (53-56))            0.24350
  26      COST LESS BASE (line (19-23))           (0.05364)        58   Loss Factor                                1.091
  27      Multiplier to Include                                    59   Multiplier to Include
           Revenue Tax Requirement                  1.0975               Revenue Tax Requirement                  1.0975
  28      GENERATION FACTOR, cents/kwh            (0.05887)        60   PURCHASED ENERGY FCTR, cents/kwh         0.29156
           (line (24x25))                                                (lines (57x58x59))
</TABLE>

<TABLE>
<CAPTION>
                   LINE            SYSTEM COMPOSITE
                   ----            ----------------
                   <S>             <C>                                                 <C>
                    61             FUEL AND PURCHASED ENERGY                           0.23269
                                    FACTOR, cents/kwh                      
                                    (lines (26+60))                    
                    62             HCPC Amendment #3, cents/kwh                        0.000
                    63             Not Used                                            0.000
                    64             ECA Reconciliation Adjustment                       0.185
                    65             ECA FACTOR, cents/kwh                               0.418 
                                    (line (61+62+63+64))                
</TABLE> 

                                      P-3
<PAGE>
 
9705FF.xls                                                          ATTACHMENT 3
Prices with PGV Addl                                                SHEET 1 OF 8

 
 
HELCO Fuel Oil Inventory Prices For                            May-97

<TABLE>
<CAPTION>

INDUSTRIAL FUEL COSTS:                                             HILO         PUNA
                                                                  -------      -------
<S>                                                               <C>          <C>          
Average Industrial Fuel Cost - $/BBL                              19.5261      19.5261
Land Transportation Cost - $/BBL                                       --       0.7722
                                                                 --------     --------
 
Industrial Costs For Filing - $/BBL                               19.5261      20.2983
Conversion Factors - mmbtu/BBL                                       6.30         6.30
                                                                 --------     --------
 
Industrial Costs for Filing - cents/mmbtu                          309.94       322.20
                                                                 ========     ========
</TABLE> 

<TABLE> 
<CAPTION> 
 
DIESEL FUEL COSTS:                                                KEAHOLE       WAIMEA        HILO       PUNA CT-3
                                                                  -------      -------      -------      ---------
<S>                                                               <C>          <C>          <C>            <C> 
Average Diesel Fuel Cost - $/BBL                                  33.0388      33.0388      33.0388        33.0388
Land Transportation Cost - $/BBL                                   2.1121       1.6047       0.7031         0.7638
                                                                 --------     --------     --------       --------
 
Diesel Costs For Filing - $/BBL                                   33.1509      34.6435      33.7419        33.8026
Conversion Factors - mmbtu/BBL                                       5.86         5.86         5.86           5.86
                                                                 --------     --------     --------       --------
 
Diesel Costs For Filing - cents/mmbtu                              599.84       591.19       575.80         576.84
                                                                 ========     ========     ========       ========
</TABLE>


<TABLE>
<CAPTION>

PURCHASED POWER:
HCPC (Contract Energy) rate for                        2nd Qtr:                            HCPC Floor:
                                                      ----------                          -----------  
<S>                                                   <C>          <C>                    <C>
                                                      - off peak   5.150  cents/kwh        4.510  cents/kwh
                                                      - on peak    6.210  cents/kwh        5.410  cents/kwh
<CAPTION> 
 
                                                       2nd Qtr:                             PGV Floor:     
                                                      ----------                          --------------   
PGV                                                   - off peak   5.470  cents/kwh        5.430  cents/kwh
                                                      - on peak    6.610  cents/kwh        6.560  cents/kwh
<CAPTION>                                                                                                  
                                                                                                           
PGV Additional Contract eff.   5/1/97                 - off peak   3.829  cents/kwh        3.325  cents/kwh
                                                      - on peak    4.829  cents/kwh        4.325  cents/kwh
<CAPTION>                                                                                                  
                                                                                                           
                                                       2nd Qtr:                           Wailuku Floor:   
                                                      ----------                          --------------   
WAILUKU HYDRO                                         - off peak   5.970  cents/kwh        5.970  cents/kwh
                                                      - on peak    7.240  cents/kwh        7.240  cents/kwh 
<CAPTION> 
 
Other:  (less than 100 KW)                                         5.950  cents/kwh
</TABLE>


                                      P-4
<PAGE>
 
                                 ATTACHMENT Q
                               SELLER'S PERMITS

<TABLE> 
<CAPTION> 

 
Permit                      Agency             Expected Issuance Date
- ------                      ------             ----------------------
<S>                         <C>                <C> 
PSD/Covered Source          DoH/EPA            February 1, 1998
 
NPDES, Water Discharge      DoH                February 1, 1998
 
Well Permit                 DLNR/DWR           June 30, 1997
 
Special Use Permit          County of Hawaii   June 30, 1997
</TABLE>


                                      Q-1
<PAGE>
 
                                  ATTACHMENT R
                             INTENTIONALLY OMITTED


                                      R-1
<PAGE>
 
                                  ATTACHMENT S
                          HELCO's SCHEDULE "J" TARIFF



                                      S-1
<PAGE>
 
Superseding Revised Sheet No. 52B        REVISED SHEET NO. 52B
Effective January 1, 1995                Effective February 21, 1995

                                  SCHEDULE "J"

                             General Service Demand

Availability:

     Applicable to general light and/or power loads which exceed 5000
kilowatthours per month or 25 kilowatts three times within a twelve-month
period, and supplied through a single meter.

     Service will be delivered at secondary voltages as specified by the
Company, except where the nature or location of the customer's load makes
delivery at secondary voltage impractical, the Company may, at its option,
deliver the service at a nominal primary voltage as specified by the Company.
Service supplied at primary voltage shall be subject to the special terms and
conditions set forth below.

Rate:

     CUSTOMER CHARGE:

          Single phase service - per month ........................$31.00
          Three phase service  - per month ........................$53.00

     DEMAND CHARGE: (To be added to Customer Charge)

          All Kw of billing demand - per Kw ........................$5.60
 
     ENERGY CHARGE: (To be added to Customer and Demand Charges)

     First 200 Kwhr/month/Kw of billing demand - per Kwhr .........13.7791
     Next  200 Kwhr/month/Kw of billing demand - per Kwhr .........11.5621
     Over  400 Kwhr/month/Kw of billing demand - per Kwhr .........10.5611

Energy Cost Adjustment Clause:

     The energy cost adjustment provided in the Energy Cost Adjustment Clause
shall be added to the Customer, Demand, and Energy Charges.

Integrated Resource Planning Cost Recovery Surcharge:

     The Integrated Resource Planning Cost Recovery Surcharge shall be added to
the Customer, Demand, and Energy Charges, and energy cost adjustment.

Minimum Charge:

     The monthly minimum charge shall be the sum of the Customer and


                      HAWAII ELECTRIC LIGHT COMPANY, INC.
Docket No. 7764
Decision and Order Nos. 13762 and 13773


                                      S-1
<PAGE>
 
Superseding Revised Sheet No. 52C        REVISED SHEET NO. 52C
Effective October 9, 1992                Effective February 21, 1995


Schedule "J (Continued)

the Demand Charges.  The Demand Charge shall be computed with the above demand
charge applied to the kilowatts of billing demand, but not less than $140.00 per
month.  The kilowatts of billing demand for the minimum charge calculation each
month shall be the highest of the maximum demand for such month, the greatest
maximum demand for the preceding eleven months, or 25 kw.

Determination of Demand:

     The maximum demand for each month shall be the maximum average load in
kilowatts during any fifteen-minute period as indicated by a demand meter.  The
kilowatts of billing demand for each month shall be the highest of the maximum
demand for such month, but not less than 75% of the greatest maximum demand for
the preceding eleven months, nor less than 25 kilowatts.

Power Factor:

     For customers with maximum measured demands in excess of 200 kilowatts per
month for any one time within a twelve-month period, the following power factor
adjustment will apply to the above energy and demand charges.

     The above energy and demand charges are based upon an average monthly power
factor of 85%.  For each 1% the average power factor is above or below 85%, the
energy and demand charges as computed under the above rates will be decreased or
increased, respectively, by 0.10%.

     The average monthly power factor will be determined from the readings of a
Kwhr meter and kvarh meter, and will be computed to the nearest whole percent
and not exceeding 100% for the purpose of computing the adjustment.  The kvarh
meter shall be ratcheted to prevent reversal in the event the power factor is
leading at any time.

Primary Supply Voltage Service:

     Where, at the option of the Company, service is delivered and metered at
the primary supply line voltage of 2400 volts or more, the energy and demand
charges as computed under the above rates will be decreased by 5.0%.  When
customers' transformers are adjacent to the delivery point, the Company may
permit the customer to be



                      HAWAII ELECTRIC LIGHT COMPANY, INC.
Docket No. 7764
Decision and Order Nos. 13762 and 13773


                                      S-2
<PAGE>
 
                                         SHEET NO. 52D
                                         Effective February 21, 1995



Schedule "J" (Continued)


metered at a single point on the secondary side of his transformers where such
point is approved by the Company.  When the energy is metered on the secondary
side of the customers' transformers, the above energy and demand charges will be
decreased by 4%.


Rules and Regulations:

     Service supplied under this rate shall be subject to the Rules and
Regulations of the Company.



                      HAWAII ELECTRIC LIGHT COMPANY, INC.
Docket No. 7764
Decision and Order Nos. 13762 and 13773


                                      S-3
<PAGE>
 
                                  ATTACHMENT T
                               FORM OF GUARANTEE




                                      T-1
<PAGE>
 
                              GUARANTEE AGREEMENT

                                    between

                              ENSERCH CORPORATION

                                      and

                     HAWAII ELECTRIC LIGHT. COMPANY, INC.



     THIS GUARANTEE AGREEMENT ("Guarantee) is made this _________ day of
_____________________, 1997 by and between HAWAII ELECTRIC LIGHT COMPANY, INC.
("HELCO"), a Hawaii corporation with principal offices in Hilo, Hawaii, and
ENSERCH CORPORATION ("Guarantor"), a Texas corporation, with principal offices
in Dallas, Texas.


                                  WITNESSETH
                                  ----------

     WHEREAS, HELCO is a regulated public utility engaged in the business of
generation, transmission and distribution of electric power to customers on the
island of Hawaii, Hawaii; and

     WHEREAS, Encogen Hawaii, L.P., a Delaware limited partnership, with
principal offices in Dallas, Texas doing business in Hawaii ("SELLER"), is an
affiliate of Guarantor; and

     WHEREAS, concurrently herewith, SELLER and HELCO have entered into a Power
Purchase Agreement, dated as of ____________________, 1997 (the "Agreement"),
whereby SELLER will construct, operate and maintain a 60 MW (net) cogeneration
facility ("the Facility") at Haina, Hawaii and HELCO will purchase the electric
output from the Facility over a period of thirty (30) years; and

     WHEREAS, HELCO is willing to enter into the Agreement only if the Guarantor
enters into this Agreement with HELCO; and

     WHEREAS, to induce HELCO to enter into the Agreement, Guarantor is willing
to enter in this Guarantee with HELCO.

     NOW, THEREFORE, in consideration of these premises and other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, Guarantor hereby represents, warrants, covenants and agrees with
HELCO as follows:


<PAGE>
 
     1. Definitions. All capitalized terms used herein and not defined herein,
        -----------
and which are defined in, or by reference in, the Agreement, as the Agreement
may be amended from time to time in accordance with its terms, shall have the
meanings specified in the Agreement

     2. Guarantee.
        ---------
        a.  Subject to the limitations contained in Section 3, Guarantor hereby
     guarantees to HELCO the due and punctual payment, as and when due, of fifty
     percent (50%)(the "Proportionate Share") of all sums payable by SELLER to
     HELCO as the result of the non-performance of obligations under the
     Agreement or other events or circumstances during the term of the
     Agreement. This Guarantee is one of two identical Guarantees being provided
     by Guarantor and J.A. Jones, Inc. in accordance with Section 2.1 of the
     Agreement, each of which constitutes a several, not joint, obligation of
     Guarantor and J.A. Jones, respectively, with respect to any sums payable by
     SELLER to HELCO under the Agreement. In no event shall HELCO have recourse
     against Guarantor in excess of the lesser of its Proportionate Share of
     SELLER's payment obligations or the limits set forth in Section 3 below.
     
        b.  This Guarantee is a primary and original obligation of Guarantor and
     is an absolute, unconditional, continuing and irrevocable guarantee and is
     in no way conditioned or contingent upon any attempt to collect payment
     from or proceed against SELLER except as stated otherwise herein. This
     Guarantee shall remain in full force and effect until the earlier to occur
     of the following events: (i) all of SELLER's obligations under the
     Agreement including, without limitation, any obligations for breach
     thereof, have been fulfilled; (ii) this Guarantee has been substituted for
     in accordance with Section 21.1 of the Agreement; or (iii) the termination
     of the Agreement; provided that obligations arising prior to such
     termination date shall survive such termination. Any notice required to be
     given by HELCO to SELLER under the Agreement shall also be given by HELCO
     to Guarantor at:

               Enserch Corporation
               1817 Wood Street, Suite #550-West
               Dallas, Texas  75201
               (214) 670-2712 (telephone)
               (214) 670-2974 (facsimile)
 
     (or such other address as Guarantor may designate in writing to HELCO).
     Guarantor shall have the same opportunity to cure defaults by SELLER under
     the Agreement as SELLER shall have; provided, however, that no time period
     provided in the Agreement for cure shall be extended or start anew by
     virtue of this sentence.

     In the event that the Agreement shall be terminated as a result of the
rejection or disaffirmance thereof by any trustee, receiver or liquidating
agency of SELLER or any of its properties, in any assignment for the benefit of
creditors or any bankruptcy, insolvency, reorganization, arrangement,
composition, readjustment, liquidation, dissolution or similar

 
                                       2
<PAGE>
 
proceeding, Guarantor's obligations hereunder shall continue to the same extent
as if such Agreement had not been so rejected or disaffirmed. Guarantor shall,
and does hereby waive all rights and benefits which might relieve, in whole or
in part, Guarantor from the performance of its duties and obligations hereunder
by reason of any such proceeding, and Guarantor agrees that it shall be liable
for all sums and obligations guaranteed by this Guarantee without regard to any
modification, limitation or discharge of the liability of SELLER that may result
from any such proceeding.

     3. Guarantee Limits. Guarantor's obligations under Section 2(a) hereof in
        ----------------
the aggregate shall be limited to the amounts shown below with respect to sums
as payable by SELLER to HELCO pursuant to the Agreement as the result of events
or circumstances during the period shown opposite such amounts:

<TABLE> 
<CAPTION> 

     Period                                                Amount *
     ------                                                ------
<S>                                                        <C>      
     Until PUC Approval                                    $ -0-
     From PUC Approval through Closing Date                $100,000
     From Closing Date through the Phase 2                 $500,000
     In-Service Date                                           
     From Phase 2 In-Service Date to end of Term           $1,500,000
</TABLE> 

*Guarantor's obligations in any given period shall be reduced by any amounts
paid by Guarantor with respect to such obligations in all preceding periods.

As used above "PUC Approval" shall mean the date that the PUC order referred to
in Section 23.14 of the Agreement becomes final and non-appealable.

     4. Generally. Guarantor shall not be liable under Section 2 of this
        ---------
Guarantee to any extent greater than if it had been the contracting party (in
place of SELLER) under the Agreement, and all the representations and warranties
made by Guarantor in Section 5 hereof in respect of this Guarantee were true in
respect of the Agreement as well as the Guarantee and notwithstanding any
bankruptcy or insolvency of SELLER. In addition, Guarantor shall have no
obligation under Section 2(a) of this Guarantee for any claim for payment,
performance or otherwise attributable to events or circumstances during the
period prior to the Phase 2 In-Service Date, not asserted by HELCO in writing
within one hundred eighty (180) days after the Phase 2 In-Service date.

     5. Representations and Warranties.  Guarantor represents and warrants as
        ------------------------------
follows:

        a. Guarantor has full power, authority and legal right to execute and
deliver and perform its obligations under this Guarantee. This Guarantee has
been duly executed and delivered by Guarantor and constitutes a legal, valid and
binding obligation of Guarantor, enforceable in accordance with its terms,
except to the extent that such enforcement may be

 
                                       3

<PAGE>
 
limited by any bankruptcy, reorganization, insolvency, moratorium or similar
laws affecting generally the enforcement of creditors' rights from time to time
in effect and general principles of equity.

          b. No consent, authorization or approval of, or filing with, any
federal, state, municipal or other governmental department, commission, board,
bureau, agency or instrumentality, domestic or foreign, is or has been required
in respect of Guarantor in connection with the execution, delivery or
performance by Guarantor of this Guarantee, or the compliance by Guarantor with
any of the remedies and provisions thereof.

          c. The execution and delivery of, and performance by Guarantor of its
obligations under this Guarantee will not result in a violation of, or be in
conflict with, any provision of the articles of incorporation or bylaws of
Guarantor, or result in a violation of, or be in conflict with, or constitute a
default or any event which would, with notice or lapse of time, or both, become
a default under, any mortgage, indenture, contract, agreement or other
instrument to which Guarantor is a party or by which it or its property is
bound, or result in a violation of, or be in conflict with, or result in a
breach of, any term or provision of any judgment, order, decree or award of any
court, arbitrator or governmental of public instrumentality binding upon
Guarantor or its property, which individually or in the aggregate would
materially adversely affect Guarantor's ability to perform its obligations under
this Guarantee.

          d. Guarantor is not in default, and no conditions exists which, with
notice of lapse of time, or both, would constitute a default by Guarantor under
any mortgage, loan agreement, deed or trust, indenture or other agreement with
respect thereto, evidence of indebtedness or other instrument of a material
nature, to which it is party or by which it is bound, or in violation of, or in
default under, any rule, regulation, order, writ, judgment, injunction or decree
of any court, arbitrator or federal, state, municipal or other governmental
authority, commission, board, bureau, agency, or instrumentality, domestic or
foreign, which individually or in the aggregate would materially adversely
affect Guarantor's ability to perform its obligations under this Guarantee.

          e. There is no action, suit, proceeding, inquiry or investigation, at
law or in equity, or before or by any court, public board or body, pending
against Guarantor, or of which Guarantor has otherwise received official notice,
of which to the knowledge of Guarantor is threatened against Guarantor, wherein
an adverse decision, ruling or finding would have a material adverse effect on
the Guarantor's financial position or its ability to perform its obligations
under this Guarantee.

          f. All agreements, representations and warranties contained herein or
made in writing by or on behalf of Guarantor in connection with the transaction
contemplated hereby shall survive the execution and delivery of this Guarantee.


                                       4
<PAGE>
 
     6. Notice. Guarantor shall give written notice to HELCO and SELLER within
        ------
ten (10) days after (i) the occurrence of any event or circumstance that results
in any of the representations and warranties made by Guarantor in Section 5
ceasing to be accurate, or (ii) the occurrence, with respect to Guarantor, of
any of the events specified in paragraphs (10) or (11) of Section 7.1A of the
Agreement as constituting an Event of Default upon the occurrence thereof with
respect to SELLER. Such notice shall describe, with reasonable particularity,
the event or circumstance that has caused such result and shall specify the
effect thereof on all representations and warranties of Guarantor that are
affected thereby.

     7. Miscellaneous.
        -------------

        a. Severability. If any term or provision of this Guarantee or the
           ------------
application thereof to any person, entity or circumstance shall to any extent be
invalid or unenforceable, the remainder of this guarantee, or the application of
such term or provision to persons, entities or circumstances other than those as
to which it is invalid or unenforceable, shall not be affected thereby, and each
term and provision of this Guarantee shall be valid and enforceable to the
fullest extent permitted by law.

        b. No Waiver. Except as specifically provided otherwise herein, the
           --------- 
failure of either party to enforce at any time any of the provisions of this
Guarantee, or to require at any time performance by the other party of any of
the provisions thereof, shall in no way be construed to be a waiver of such
provision, nor in any way to affect the validity of this Guarantee or any part
thereof, or the right of such party thereafter to enforce every such provision.

        c. Modification. No modification or waiver of all or any part of this
           ------------ 
Guarantee shall be valid unless it is reduced to writing and signed by both
parties.
 
        d. Governing Law and Interpretation. Interpretation and performance of
           --------------------------------
this Guarantee shall be in accordance with, and shall be controlled by, the laws
of the State of Hawaii, other than the laws thereof that would require reference
to the laws of any other jurisdiction.
 
        e. Counterparts. This Guarantee may be executed in several
           ------------
counterparts and all such executed counterparts shall constitute one agreement,
binding on both parties thereto, notwithstanding that both parties may not be
signatories to the original or the same counterpart.
 
        f. Successors and Assigns. This Guarantee shall be binding upon
           ---------------------- 
Guarantor and its successors and assigns and all persons claiming under or
through Guarantor or any such successor or assigns, and shall inure to the
benefit of, and be enforceable by, HELCO.

 
                                       5
<PAGE>
 
          g. Consolidation. In the event that HELCO brings an action to enforce
             -------------
this Guarantee during the pendency of any proceeding (arbitration or otherwise)
between HELCO and SELLER, Guarantor shall have the option to join such
enforcement action with any such pending proceeding. Moreover, Guarantor shall
have the option to join any such proceeding first brought against Guarantor with
any subsequent proceeding brought against SELLER. In each of the cases described
above, such joinder option shall extend until such time as final judgment is
rendered in the relevant proceeding.



         IN WITNESS WHEREOF, HELCO and Guarantor have caused this Guarantee to
be executed by their respective duly authorized officers as of the date first
above written.



                               HELCO:  HAWAII ELECTRIC LIGHT COMPANY, INC.


                                       By ------------------------------------

                                          Its --------------------------------


                                       By ------------------------------------

                                          Its --------------------------------



                           Guarantor:  ENSERCH CORPORATION


                                       By
                                          ------------------------------------
                                          Its   Vice President and Treasurer   
                                                ------------------------------

                                       By 
                                          ------------------------------------
                                          Its     President                   
                                              --------------------------------


 
                                       6


<PAGE>
 
                                                            HECO Exhibit 10.7(a)
                                                            --------------------



                           INTERCONNECTION AGREEMENT


                                    between

                              ENCOGEN HAWAII, L.P.

                                      and

                      HAWAII ELECTRIC LIGHT COMPANY, INC.
<PAGE>
 
<TABLE>
<CAPTION>
                               TABLE OF CONTENTS
                               -----------------
 
<S>                                                                        <C>
RECITALS.................................................................   1
 
AGREEMENT................................................................   1

1.   DEFINITIONS.........................................................   1

2.   DESIGN, ENGINEERING AND CONSTRUCTION OF INTERCONNECTION FACILITIES..   2

3.   GOVERNMENTAL APPROVALS..............................................   3

4.   EASEMENTS AND RIGHTS-OF-WAY, ETC....................................   3

5.   OPERATION AND MAINTENANCE...........................................   4

6.   PAYMENT FOR THE INTERCONNECTION FACILITIES..........................   4

7.   TRANSFER OF OWNERSHIP/TITLE.........................................   5

8.   RELOCATION OF INTERCONNECTION FACILITIES............................   6

9.   NEW TRANSMISSION LINE...............................................   6

10.  DETERMINATION OF RECONDUCTORING COSTS...............................   7
     
11.  INDEMNIFICATION.....................................................   8
     
12.  PUC APPROVAL........................................................   8
     
13.  ASSIGNMENT..........................................................   8
     
14.  DISPUTE RESOLUTION..................................................   8
     
15.  COUNTERPARTS........................................................   8
     
16.  TERMINATION; SURVIVAL...............................................   8
</TABLE>
<PAGE>
 
                           TABLE OF CONTENTS (CONT'D)
<TABLE>
<CAPTION>
 
<S>                                                                         <C>
17.   GOVERNING LAW AND INTERPRETATION..................................    8
 
18.   MODIFICATION OR AMENDMENT.........................................    9

19.   NOTICES...........................................................    9

20.   NO PARTY DEEMED DRAFTER...........................................    9

21.   HEADINGS..........................................................    9

22.   NO WAIVER.........................................................    9

23.   SEVERABILITY......................................................    9

24.   ENTIRE AGREEMENT..................................................   10
</TABLE>
                                        

                                       2
<PAGE>
 
                           INTERCONNECTION AGREEMENT
                           -------------------------
                                        




          This INTERCONNECTION AGREEMENT (this "Agreement"), is made as of this
22nd day of October, 1997, between ENCOGEN HAWAII, L.P., a Delaware limited
partnership with its principal offices in Dallas, Texas ("SELLER"), and HAWAII
ELECTRIC LIGHT COMPANY, INC., a Hawaii corporation with its principal offices in
Hilo, Hawaii ("HELCO").



                                   RECITALS:
                                   ---------

          A.  SELLER and HELCO have entered into a certain Power Purchase
Agreement dated as of October 22, 1997 (the "Power Purchase Agreement" or
"PPA"), pursuant to which SELLER will sell to HELCO electric output from an
approximately 60-megawatt diesel oil-fired power production facility (the
"Facility") to be constructed in Haina, Hawaii.

          B.  In order to permit a flow of electricity between the Facility and
HELCO's existing electric system, certain interconnection facilities need to be
constructed, all as more particularly described on Schedule 1 attached to this
                                                   ----------                 
Agreement (collectively, the "Interconnection Facilities").

          C.  Pursuant to Decision and Order No. 15053 ("D&O No. 15053") issued
by the Hawaii Public Utilities Commission ("PUC"), HELCO is required to design,
procure and construct a new sixty-nine (69) kilovolt (kV) transmission line from
Keamuku to the New Switching Station, all as more particularly described on
Schedule 2 attached to this Agreement (the "New Transmission Line") and SELLER
- ----------                                                                    
is required to make certain payments to HELCO in connection with the New
Transmission Line.

          D.  SELLER and HELCO desire to set forth their respective
responsibilities for the design, engineering, construction, ownership, operation
and maintenance of the Interconnection Facilities, and certain costs and
obligations associated therewith, and their respective responsibilities
concerning the New Transmission Line pursuant to the terms and conditions of
this Agreement.

          NOW, THEREFORE, in consideration of the foregoing recitals, and for
other good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, each of SELLER and HELCO agrees as follows:


                               A G R E E M E N T
                               - - - - - - - - -

          1.  Definitions. Unless otherwise defined herein, all capitalized 
              -----------
terms used in this Agreement shall have the meanings assigned to such terms in
the Power Purchase Agreement.

                                       1
<PAGE>
 
          (a) "Baseline Interconnection Configuration" shall have the meaning
set forth in Section 6(b).

          (b) "Contractors" shall have the meaning set forth in Section 2(b).

          (c) "Independent Engineer" shall have the meaning set forth in Section
10(a).

          (d) "New Switching Station" shall mean the new switching station to be
designed and constructed by SELLER and transferred to HELCO as depicted in
Exhibit 1 to Schedule 1 attached to this Agreement.
             ----------                            

          (e) "Plans" shall have the meaning set forth in Section 2(c).

          (f) "Point of Interconnection" shall mean the point at the New
Switching Station side of the high side step up transformer isolating switch, as
depicted on the interconnection diagram attached as Exhibit 1 to Schedule 1 to
                                                                 ----------   
this Agreement.

          (g) "Reconductoring Costs" shall have the meaning set forth in
Section 10.

          (h) "Residual Payment Amount" shall have the meaning set forth in
Section 7(b).

          (i) "Scope of Work" shall have the meaning set forth in Section 10(b).

          (j) "Specifications" shall have the meaning set forth in Section
10(b).

          (k) "Standards" shall have the meaning set forth in Section 2(c).

          (l) "Transfer Date" shall have the meaning set forth in Section 7(a).
 

      2.  Design, Engineering and Construction of Interconnection Facilities.
          ------------------------------------------------------------------ 

          (a) SELLER shall be responsible for the design, engineering and
construction of the Interconnection Facilities.

          (b) SELLER may, at its option, engage third party consultants or
contractors (the "Contractors") to perform its obligations hereunder; provided
                                                                      --------
that SELLER's selection of any Contractor shall be subject to HELCO's prior
- ----                                                                       
approval, which approval shall not be unreasonably withheld.

          (c) The design and engineering plans (the "Plans") of SELLER regarding
the Interconnection Facilities shall comply with (i) all applicable laws; (ii)
HELCO's

                                       2
<PAGE>
 
design specifications and construction standards listed on Schedule 3 and (iii)
                                                           ----------          
Good Engineering and Operating Practices (collectively, the "Standards").
Unless otherwise agreed to by the parties, HELCO shall have twenty (20) days
following receipt of SELLER's Plans for its review, comment and verification
that the Plans comply with the Standards, which verification shall not be
unreasonably withheld.  HELCO shall be deemed to have waived its right to review
and comment under this Section 2(c) and to have given its verification with
respect to such Plans if it fails to exercise its rights within such twenty (20)
day period.  If HELCO reasonably determines that SELLER's Plans are not in
accordance with the Standards, then it may request in writing a response from
SELLER to its comments and SELLER shall respond in writing within twenty (20)
days of such request by providing (i) its justification for why its Plans
conform to the standards or (ii) changes in the Plans responsive to HELCO's
comments and in accordance with the Standards.

          (d) SELLER shall permit HELCO to inspect the construction of its
Interconnection Facilities at all reasonable times during normal business hours
and upon prior notice to its designated contact, which if oral shall be promptly
documented in writing.  SELLER shall also provide HELCO with monthly progress
reports on the status of the construction. At HELCO's reasonable request, SELLER
shall provide HELCO an opportunity to meet with appropriate personnel and any
contractors to discuss and assess any such progress report.

          (e) Construction of the Interconnection Facilities shall be completed
and the Interconnection Facilities shall be demonstrated to be commercially
operable by the Phase 1 In-Service Date Deadline, as extended for Force Majeure.
In the event that SELLER fails to complete the Interconnection Facilities by
such date, and the components not completed are necessary to SELLER's
eligibility to receive Capacity Charge payments under Article V of the Power
Purchase Agreement, HELCO shall have no obligation to make such Capacity Charge
payments until such work is completed and the conditions of Article V of the
Power Purchase Agreement are satisfied.

          (f) HELCO and SELLER shall cooperate in good faith to coordinate tie-
in of the Interconnection Facilities to HELCO's electrical system.

      3.  Governmental Approvals. SELLER shall obtain all required permits,
          ---------------------- 
licenses, approvals and other governmental authorizations (the "Governmental
Approvals") required to construct, own and operate the Interconnection
Facilities prior to the Transfer Date. HELCO shall obtain all other Governmental
Approvals required, if any, to maintain and operate the Interconnection
Facilities on and after the Transfer Date. On or before the Transfer Date,
SELLER shall provide HELCO with copies of all such permits and approvals
obtained by SELLER regarding the construction, ownership or operation of the
Interconnection Facilities.

      4.  Easements and Rights-of-Way, Etc. SELLER shall obtain all easements
          ---------------------------------
and rights-of-way on the Site and on any other affected property which are
required to construct, maintain and operate the Interconnection Facilities. At
HELCO's request, SELLER shall use reasonable efforts to obtain perpetual
easements; provided, that, HELCO shall pay or reimburse SELLER for any
           --------  ----             
incremental costs incurred by SELLER in connection therewith. Such

                                       3
<PAGE>
 
easements and rights of way shall not contain terms and conditions which are not
commercially reasonable and shall be provided in advance to HELCO for its
review.  Furthermore, to the extent the existing easement or right of way
relating to SELLER's two one-mile lines are not adequate to also accommodate the
corresponding segment of HELCO's New Transmission Line, SELLER shall use
reasonable efforts to obtain the additional necessary easement; provided that
                                                                -------------
HELCO shall pay or reimburse SELLER for any incremental costs incurred by SELLER
in connection therewith.

      5.  Operation and Maintenance. SELLER shall operate and maintain, at its
          ------------------------- 
cost, the Interconnection Facilities prior to the Transfer Date. On and after
the Transfer Date, HELCO shall own, operate and maintain the Interconnection
Facilities. So long as the Interconnection Facilities are dedicated exclusively
to SELLER, SELLER shall reimburse HELCO for all reasonable and routine operation
and maintenance expenses of such facilities, subject to review and approval by
SELLER, which approval shall not be unreasonably withheld. In the event HELCO
taps off the lines or New Switching Station included in the Interconnection
Facilities, for its benefit or the benefit of other parties (including, without
limitation, other nonutility generators), HELCO or such other party shall share
proportionately in the operation and maintenance expenses for that specific
portion of the Interconnection Facilities. HELCO shall operate and maintain, at
its cost, the remainder of the HELCO transmission system, including without
limitation, the New Transmission Line.

      6.  Payment for the Interconnection Facilities.
          ------------------------------------------ 

          (a) SELLER shall bear the cost of design, engineering and construction
of the Interconnection Facilities.  SELLER shall reimburse HELCO for the
reasonable out-of-pocket costs for any work which may be done on such
Interconnection Facilities by HELCO or its Contractors pursuant to this
Agreement or at SELLER's request.

          (b) HELCO shall, at SELLER'S option, reimburse SELLER or pay for any
and all reasonable incremental costs which SELLER incurs or would incur relating
to the Interconnection Facilities which are incurred to tie-in the New
Transmission Line or which are necessary to accommodate the New Transmission
Line, including without limitation the costs of any additional breakers,
additional easements or rights of way, or the incremental costs of additional
poles or the use of steel poles in lieu of wood poles, and any costs associated
therewith.  For purposes of this Agreement, such "incremental costs" shall
include, without limitation, all procurement and construction costs above and
beyond those that would normally be incurred in accordance with custom in the
power generation industry in connection with a four-line (element) breaker and
one half configuration, based on six breakers and two transformers (the
"Baseline Interconnection Configuration").  SELLER shall bear any additional
design costs associated with modification of the Baseline Interconnection
Configuration to accommodate the New Transmission Line.

                                       4
<PAGE>
 
      7.  Transfer of Ownership/Title.
          --------------------------- 

          (a) Following completion of the construction of the Interconnection
Facilities (but prior to the Phase 1 In-Service Date Deadline, as extended for
Force Majeure), SELLER shall transfer (such transfer date, the "Transfer Date")
to HELCO all of SELLER's right, title and interest in and to the Interconnection
Facilities to the extent that such facilities were constructed and owned by
SELLER.  In connection with the transfer of the Interconnection Facilities,
SELLER shall transfer and assign to HELCO all applicable manufacturer's or
Contractor's warranties which are assignable.  The Interconnection Facilities
shall be transferred by SELLER to HELCO "as is, where is" and SELLER shall not
provide any warranty whatsoever regarding the Interconnection Facilities, other
than the assignment of such manufacturer's or Contractor's warranties.

          (b) HELCO's title and ownership of the Interconnection Facilities
shall be free and clear of subcontractor liens and encumbrances, subject to the
following restrictions: (1) SELLER shall reserve and shall at all times have the
right to use the Interconnection Facilities (as the same may be replaced,
expanded, or modified) for so long as the Facility (as the same may be replaced,
expanded, or modified) continues operations at the Site; provided, that, SELLER
                                                         --------  ----        
shall have no right to use the Interconnection Facilities subsequent to the
termination of the PPA or to receive the Residual Payment Amount (as defined
herein) if such termination is the result of an event of default by SELLER
pursuant to Sections 7.1A(4), (7), (8), (9), (12), (13), (18) or (19) of the
PPA; and provided, further, that in the event the SELLER notifies HELCO that the
         --------  -------                                                      
Facility has ceased operations, HELCO shall, within thirty (30) days, pay SELLER
an amount (the "Residual Payment Amount") to be determined by the parties in
good faith based upon depreciated book value or salvage value of the
Interconnection Facilities, whichever is greater (or by appraisal if the parties
cannot agree within thirty (30) days) based upon the residual value of the
Interconnection Facilities at the time the Facility ceases to operate and such
right of access terminates; and (2) until such time as the Residual Payment
Amount is paid and except as specifically provided otherwise in Section 8, HELCO
shall not relocate the Interconnection Facilities or sell, lease or otherwise
encumber such facilities without SELLER'S prior written consent.   SELLER's
continuing right to use the Interconnection Facilities after the term of the PPA
as provided herein shall not, in and of itself, create any right of access to
HELCO's electrical system for purposes of wheeling to other purchasers of energy
and/or capacity and shall not preclude HELCO from charging for such wheeling
services to the extent permitted by law and applicable regulations.

          (c) In connection with the transfer of the Interconnection Facilities
to HELCO, SELLER shall, at its option, grant or transfer to HELCO such
easements, rights of way, or licenses as the case may be necessary to operate
and maintain the Interconnection Facilities on and after the Transfer Date.

          (d) In connection with SELLER's transfer of the Interconnection
Facilities, HELCO shall be responsible for and shall pay any and all expenses,
costs and taxes in connection with the transfer of the Interconnection
Facilities and shall indemnify and make SELLER whole for any such taxes,
expenses or costs.  On and after the Transfer Date, HELCO

                                       5
<PAGE>
 
shall be responsible for all property and other taxes associated with the
ownership and operation of the Interconnection Facilities.

          (e) During the term of the PPA, the Interconnection Facilities shall
be dedicated primarily to accommodate the delivery of electricity by SELLER to
HELCO under the PPA (or, if applicable, by HELCO to SELLER), and SELLER shall
not use the Interconnection Facilities in a manner that conflicts or interferes
with the performance of its obligations under the PPA.

      8.  Relocation of Interconnection Facilities. Should HELCO be required
          ----------------------------------------
after the Transfer Date, pursuant to (i) terms of an applicable easement
relating to such Interconnection Facilities or (ii) a request by the State of
Hawaii or a county thereof in the event such Interconnection Facilities fall
within Hawaii's or such county's right of way, to relocate any part of the
Interconnection Facilities, SELLER shall pay or reimburse HELCO for its
reasonable, out-of-pocket cost and expenses in connection with such relocation
and the reconnection of the Facility with HELCO's electrical system; provided,
                                                                     --------
that, HELCO shall use reasonable efforts to effect such relocation in a prompt
- ----  
and cost effective manner and shall, during any related disconnection of the
Facility, continue to make Capacity Charge payments under the Power Purchase
Agreement.

      9.  New Transmission Line.
          ---------------------

          (a) HELCO shall provide SELLER with monthly progress reports (or such
other reports as filed by HELCO with the PUC) documenting HELCO's progress in
constructing the New Transmission Line; provided, that, HELCO's obligations to
                                        --------  ----                        
purchase energy and capacity under the Power Purchase Agreement shall not be
affected in any way by HELCO's failure to complete or delays in completing the
New Transmission Line.  HELCO shall have full responsibility for and shall bear
any and all costs of such actions or equipment as may be necessary for HELCO to
accept the full electrical output of the Facility.  In the event that HELCO is
unable to accept the full electrical output of the Facility due to its failure
to take such actions, HELCO shall be obligated to pay SELLER the Capacity Charge
payments to which it would have been entitled under the PPA if HELCO had taken
such necessary actions.

          (b) In connection with the New Transmission Line, SELLER agrees to pay
HELCO an amount equal to the Reconductoring Costs (as determined pursuant to
Section 10) in three (3) installments as follows:

     Upon the issuance of final, non-appealable
     PUC Order approving the PPA:                  30%

     Upon HELCO's receipt of final
     Environmental Impact Statement
     regarding the New Transmission Line:          30%

     Upon energizing and placing of the New

                                       6
<PAGE>
 
     Transmission Line in service:                 40%

     Such amounts shall be due and payable by SELLER to HELCO within thirty (30)
days after SELLER's receipt of:  (i) a certificate signed by a duly authorized
officer of HELCO, certifying that such milestone event has occurred; and (ii)
such other supporting evidence and documentation as SELLER shall reasonably
request.  Except as provided in this Section 9(b), SELLER shall not be
responsible for any other costs related to the New Transmission Line.

          (c) Upon completion of the New Transmission Line, HELCO and SELLER
shall cooperate to coordinate the tie-in of the New Transmission Line with
Interconnection Facilities in a manner that minimizes the interruption of the
Facility operation; provided that during such interruption HELCO shall remain
                    -------------                                            
obligated to make Capacity Charge payments to SELLER as provided in the PPA.

          10.  Determination of Reconductoring Costs.
               --------------------------------------

          (a) The parties shall hire an independent engineer (the "Independent
Engineer") from the list of qualified independent engineers set forth on
Schedule 4 attached hereto to determine the cost of reconductoring HELCO's
- ----------                                                                
sixty-nine (69) kV transmission line from its Waimea Substation to its Honokaa
substation (such cost, the "Reconductoring Costs").

          (b) The scope of work to be performed by the Independent Engineer (the
"Scope of Work") and the reconductoring specifications (the "Specifications")
shall be mutually determined by the parties within forty-five (45) days
following the PUC Submittal Date and shall be attached as Schedule 5 to this
                                                          ----------        
Agreement.

          (c) The cost of the work to be performed by the Independent Engineer
as provided in Section 10(b) shall be borne by SELLER.

          (d) The Reconductoring Costs shall include only the cost of replacing
the existing conductors (as of the date of this Agreement) on the Honokaa-Waimea
69 kV transmission line, including, but not limited to, normal AFUDC (as
determined in accordance with custom in the power generation industry),
switching costs, traffic control costs and other costs normally incurred by
HELCO in such reconductoring projects, but shall exclude the costs of pole
replacement, unless such pole must be replaced by a larger pole to accommodate a
higher rated conductor.  Replacement of deteriorated poles shall not be included
in determining Reconductoring Costs unless the pole would have been replaced
under the foregoing sentence regardless of its condition.

          (e) The Independent Engineer's determination of the Reconductoring
Costs in accordance with the Scope of Work and the Specifications shall be
accepted by the parties for purposes of calculating the payment pursuant to
Section 9(b), unless either party can demonstrate the existence of a material
error or omission by the Independent Engineer in making such determination.  In
the event of a dispute regarding such determination which is not resolved within
thirty (30) days, the parties shall appoint a new Independent Engineer from the
list on

                                       7
<PAGE>
 
Schedule 4, who shall review the work performed by the first Independent
- ----------                                                              
Engineer and issue a determination which shall be binding on the parties.  The
cost of the new Independent Engineer shall be borne by both parties equally.

          11.  Indemnification.  In connection with the performance of this
               ---------------
Agreement, each party agrees to indemnify and hold harmless the other party from
and against any and all liabilities, claims, losses, damages, or expenses,
including reasonable counsel fees, whether arising before or after completion of
the work hereunder, which may be incurred or sustained by the indemnified party
by reason of the negligence, willful act or omission of the other party.

          12.  PUC Approval. The parties' respective obligations hereunder shall
               ------------
be contingent on HELCO's receipt of the PUC Order as defined in the PPA.

          13.  Assignment. The parties shall have the right to assign this
               ----------
Agreement to the same extent the PPA may be assigned pursuant to Article XVII
thereof.

          14.  Dispute Resolution. Except as provided in Section 10(e), any
               ------------------
dispute arising under this Agreement shall be resolved, if possible, by HELCO's
President and SELLER's project manager, or their respective designees, and any
remaining disputes shall be resolved pursuant to arbitration in accordance with
the procedures set forth in Article XIV of the PPA, or in the case of a dispute
under Section 2(c) hereof, under Section 2.4C of the PPA.

          15.  Counterparts. This Agreement may be executed in several
               ------------
counterparts and all so executed counterparts shall constitute one Agreement,
binding on both parties thereto, notwithstanding that both parties may not be
signatories to the original or the same counterpart.

          16.  Termination; Survival. This Agreement shall be effective upon
               ---------------------
execution and shall be co-terminous with the Power Purchase Agreement, except
for Sections 7(b) and 11 which shall survive termination.

          17.  Governing Law and Interpretation. Interpretation and performance
               --------------------------------
of this Agreement shall be in accordance with, and shall be controlled by, the
laws of the State of Hawaii, other than the laws thereof that would require
reference to the laws of any other jurisdiction.

          18.  Modification or Amendment. No modification, amendment or waiver
               ------------------------- 
of all or any part of this Agreement shall be valid unless it is reduced to
writing and signed by both parties.

          19.  Notices. Except as otherwise specified in this Agreement, any
               -------
notice, demand or request required or authorized by this Agreement to be given
in writing to a party shall be either personally delivered or mailed by
registered or certified mail (return receipt requested) postage prepaid to such
party at the following address:

     If to SELLER:            Encogen Hawaii, L.P.

                                       8
<PAGE>
 
                      c/o Enserch Development Corporation       
                      1817 Wood Street, Suite #550 - West       
                      Dallas, TX 75201                          
                      Attention: Vice President - Administration
                      (214) 670-2712 (telephone)                
                      (214) 670-2974 (fax)                      

     If to HELCO:     Hawaii Electric Light Company, Inc.
                      P.O. Box 1027
                      Hilo, Hawaii 96720-1027
                      Attention: Manager, Production (or such other person who
                      may be designated in writing by HELCO)

     The designation of such person and/or address may be changed at any time by
either party upon written notice given pursuant to the requirements of this
Section 19.  A notice served by mail shall be effective upon receipt.

          20.  No Party Deemed Drafter.  No party shall be deemed the drafter of
               -----------------------
this Agreement. If this Agreement is ever construed by a court of law, such
court shall not construe this Agreement or any provision hereof against any
party as the drafter.

          21.  Headings.  The paragraph headings of the various sections have
               --------
been inserted in this Agreement as a matter of convenience for reference only
and shall not modify, define or limit any of the terms or provisions hereof and
shall not be used in the interpretation of any term or provision of this
Agreement.

          22.  No Waiver.  The failure of either party to enforce at any time
               ---------
any of the provisions of this Agreement, or to require at any time performance
by the other party of any of the provisions hereof, shall in no way be construed
to be a waiver of such provisions, nor in any way to affect the validity of this
Agreement or any part hereof or the right of such party thereafter to enforce
every such provision.

          23.  Severability.  If any term or provision of this Agreement or the
               ------------
application thereof to any person, entity or circumstance shall to any extent be
invalid or unenforceable, the remainder of this Agreement, or the application of
such term or provision to persons, entities or circumstances other than those as
to which it is invalid or unenforceable, shall not be affected thereby, and each
term and provision of this Agreement shall be valid and enforceable to the
fullest extent permitted by law.

          24.  Entire Agreement.  Except to the extent covered under the PPA,
               ----------------
this Agreement shall constitute the entire agreement between the parties with
respect to interconnection of the Facility with HELCO's electrical system, and
shall supersede all prior contracts, proposals, negotiations, and discussions,
whether written or oral. This Agreement shall govern in the event of a conflict
as to interconnection matters between this Agreement and the PPA.

                                       9
<PAGE>
 
          IN WITNESS WHEREOF, HELCO and SELLER have caused this Agreement to be
executed by their respective duly authorized officers as of the date first above
written.

                     HELCO: HAWAII ELECTRIC LIGHT COMPANY, INC.


                            By:  /s/ T. Michael May
                                 -----------------------------------
                            Its: Chairman of the Board


                            By:  /s/ Warren H. W. Lee
                                 ------------------------------------
                            Its: President


                     SELLER: ENCOGEN HAWAII, L.P.

                            By:  ENSERCH DEVELOPMENT 
                                 CORPORATION HAWAII, INC.
                                 Managing General Partner


                                 By: /s/ Allan V. Smith
                                     ------------------------------

                                     Name:  Allan V. Smith
                                     Title: Senior Vice President

                                       10
<PAGE>
 
                               LIST OF SCHEDULES
                               -----------------
                                        
Schedule 1  Interconnection Facilities
- ----------                            

Schedule 2  New Transmission Line
- ----------                       
                                        
Schedule 3  List of HELCO Design Specifications and Construction Standards
- ----------                                                                

Schedule 4  List of Independent Engineers
- ----------                               

Schedule 5  Scope of Work; Specifications
- ----------                               
<PAGE>
 
                                   SCHEDULE 1
                                   ----------
                                        
                           Interconnection Facilities
                           --------------------------
                                        
The Interconnection Facilities set forth in this Schedule 1 shall be installed
to form a connection between the Facility and HELCO's electrical system.  For
the purposes of this Interconnection Agreement, HELCO's electrical system begins
at the edge of the Honokaa - Puukapu 69-kV transmission line right-of-way (the
"HELCO ROW") and adjacent to the Honokaa substation where the two, new 69-kV
transmission lines from the New Switching Station shall connect (by means of a
flying tap) to the existing Honokaa - Puukapu 69-kV transmission line - forming
a Hamakua - Honokaa 69-kV transmission line and a Hamakua - Puukapu 69-kV
transmission line.  The two, new 69-kV transmission lines will be terminated
onto an anchor pole (if applicable) installed by HELCO at EDC's cost within the
HELCO ROW.

The Interconnection Facilities shall be comprised of all power system equipment
installed by SELLER and other related equipment as necessary for the
interconnection in conformance with the Specifications and Standards listed on
Schedule 3, between the high-side switches of the Facility's 13.8/69-kV step-up
transformers and HELCO's electrical system, including the following elements, as
depicted in Exhibit 1:

1.   The 69-kV New Switching Station, including site preparation, fencing,
     gates, trenching for cable placement, structures, and buswork configured
     initially to operate with six (6) breakers arranged in a breaker-and-a-half
     scheme./1/

2.   One (1) 69-kV transmission line from the New Switching Station to the HELCO
     ROW system, approximately one (1) mile in length, referred to as the
     Hamakua - Honokaa 69-kV transmission line./2/

3.   One (1) 69-kV transmission line from the New Switching Station to the HELCO
     ROW system, approximately one (1) mile in length, referred to as the
     Hamakua - Puukapu 69-kV transmission line.

4.   Six (6) 69-kV circuit breakers, and associated switches, relays,
     protection, and controls for the New Switching Station connection of:

     4.a. the Facility's two (2) 13.8/69-kV generator step-up transformers, each
          rated adequately to handle the entire output of the Facility;

     4.b. the Hamakua - Honokaa 69-kV transmission line; and

- ------------------------
/1/ The New Switching Station site preparation, fencing, and gates will be
    designed to accommodate a maximum of nine (9) 69-kV circuit breakers
    arranged in a breaker-and-a-half scheme.

/2/ The new Hamakua-Honokaa 69-kV transmission line and the new Hamakua-Puukapu
    69-kV transmission line may be supported on two, separate, wood pole lines,
    or on a single, steel, double-circuit tower line.

                                  Schedule 1
<PAGE>
 
     4.c. the Hamakua - Puukapu 69-kV transmission line.


5.   In the event HELCO reasonably requests a change in the configuration from
     that depicted on Schedule 1, SELLER shall in good faith consider measures
     to accommodate HELCO's request; provided, that, HELCO shall reimburse and
                                     --------  ----                           
     make SELLER whole with respect to all direct or indirect costs or loss of
     revenues resulting from accommodating HELCO's request.
<PAGE>
 
Exhibit 1 to Schedule 1 (drawing):
- ----------------------------------
ENCOGEN/HELCO Interconnection Agreement: one line diagram of interconnection
facilities and the new transmission line
<PAGE>
 
                                  SCHEDULE 2
                                  ----------
                                        

                             New Transmission Line
                             ---------------------
                                        
The New Transmission Line facilities shall be installed by HELCO in conformance
with the Specifications and Standards listed on Schedule 3, and shall include
the following elements as depicted on Exhibit 1:

1.   One (1) 69-kV transmission line from the New Switching Station to HELCO's
     existing Keamuku substation, approximately twenty-nine (29) miles in
     length, referred to as the Hamakua - Keamuku 69-kV transmission line.

2.   Four (4) 69-kV circuit breakers two (2) at the New Switching Station and
     two (2) at the Keamuku Substation, and associated switches, relays,
     protection, and controls for the breaker-and-a-half New Switching Station
     connection of the Hamakua - Keamuku 69-kV transmission line.

3.   Modifications to HELCO's Keamuku substation associated with the breaker-
     and-a-half connection of the Hamakua - Keamuku 69-kV transmission line.

4.   Reconductoring and/or rebuilding the 69-kV transmission line segments from:

     4.a. Keamuku substation to Puuhuluhulu substation;

     4.b. Puuhuluhulu substation to Puuwaawaa substation;

     4.c. Puuwaawaa substation to Huehue; and

     4.d. Huehue substation to Keahole substation.

5.   Addition of twelve (12) megavars of 69-kV shunt capacitors in West Hawaii.




                                  Schedule 2
<PAGE>
 
                                  SCHEDULE 3
                                  ----------
                                        
            HELCO Design Specifications and Construction Standards
            ------------------------------------------------------
                                        
          Hawaii Electric Light Co. Inc.'s Overhead Transmission Line Design and
Construction Specifications (a copy of which is on file at the offices of HELCO
and Enserch), as transmitted by HELCO to Enserch on or about October 10, 1995.

                                   Schedule 3
<PAGE>
 
                                   SCHEDULE 4
                                   ----------
                                        
                         List of Independent Engineers
                         -----------------------------

1.   Mr. Mark Shaw
     C. H. Guernsey & Company
     5555 N. Grand Blvd.
     Oklahoma City, OK  73112
     405-947-5515
     405-947-5542 (fax)

2.   Mr. M. L. Norton
     Miner & Miner Consulting Engineers, Inc.
     910 27th Avenue
     Greeley, CO  80631
     970-352-3706
     970-352-3716 (fax)

3.   Sylva Engineer Corp.
     1303-B Sherwood Forest
     Houston, TX  77043
     713-973-7329
     713-973-7359 (fax)

4.   R. W. Beck
     2101 Fourth Avenue
     Suite 600
     Seattle, WA  98121-2375
     206-441-7500
     206-441-4962 (fax)

                                  Schedule 4
<PAGE>
 
                                  SCHEDULE 5
                                  ----------

              Scope of Work for Independent Engineering Services
              --------------------------------------------------
     To Estimate the Cost of Reconductoring the Honokaa-Waimea 69-kV Line
     --------------------------------------------------------------------

1.  SCOPE.  The Independent Engineer shall provide a cost estimate for the
reconductoring of the existing 69-kV line between Hawaii Electric Light
Company's (HELCO) Honokaa and Waimea Substations.  The cost estimate shall
include the labor and equipment cost of all removal of conductor, insulators and
miscellaneous hardware net of material salvage value shown in HELCO's accounting
property records.  The cost estimate shall include labor, equipment and material
cost of new poles, conductors, insulators, guys, anchors and other miscellaneous
hardware required to make the facilities complete and operational.  The cost
estimate shall include the cost of required pole relocations and the transfer of
existing distribution facilities to new and relocated poles.  The reconductoring
cost estimate shall not include any cost of ordinary replacement of deteriorated
facilities.  The Independent Engineer shall be a currently licensed Professional
Engineer in the State of Hawaii.

The Independent Engineer shall utilize as the primary basis for the cost
estimate at least four similar projects commenced or completed within the last
24 months.  At least two such projects shall have been in the State of Hawaii,
and if possible, publicly bid.  The remaining two projects shall have been
publicly bid.  The Independent Engineer shall provide to both parties a copy of
all documents and data relied upon in producing the cost estimate.

2.  REFERENCES.  The independent engineer shall utilize the Standards referenced
in Section 2(c) of this agreement.

3.  MATERIALS.  The facilities shall be designed using HELCO's material
standards.  HELCO will provide a list of acceptable materials in use prior to
commencement of work  The new conductor shall be 556.5 kcmil AAC (Dahlia).  The
shield wire shall be 195.7 kcmil (Amherst).

4.  INFORMATION TO BE PROVIDED TO THE INDEPENDENT ENGINEER.  HELCO shall provide
"as built" drawings of the existing facilities including distribution
underbuild.

5.  INFORMATION TO BE PROVIDED BY THE INDEPENDENT ENGINEER.  The Independent
Engineer shall provide a labor and material cost estimate for the project along
with a discussion of the development of the cost estimates including adjustments
made.  The cost estimate shall be broken down by construction units with all
distribution shown as separate construction units.  Prior to commencing work on
the cost estimate the Independent Engineer shall also provide plan and pole
framing elevation drawings for approval of both Enserch and HELCO.  A bill of
materials retired and a bill of materials installed shall also be provided for
approval prior to commencing work on the cost estimate.



                                  Schedule 5

<PAGE>
 
                                                               HECO Exhibit 10.8
                                                               -----------------





                      LOW SULFUR FUEL OIL SUPPLY CONTRACT


                                 by and between


                           CHEVRON PRODUCTS COMPANY,
                        A DIVISION OF CHEVRON U.S.A. INC


                                      and


                        HAWAIIAN ELECTRIC COMPANY, INC.


                                * * * * * * * *
<PAGE>
 
                               TABLE OF CONTENTS
<TABLE>
<CAPTION>
 
                                           ARTICLE                                          PAGE
<S>                                                                                          <C> 
ARTICLE 1:   Definitions                                                                      1
ARTICLE 2:   Term of Contract                                                                 3
ARTICLE 3:   Purchase Volumes and Delivery Rates                                              3
          Section 3.1:  Purchase Volumes                                                      3
          Section 3.2:  Delivery Rates                                                        4
ARTICLE 4:   Quality                                                                          5
ARTICLE 5:   Price                                                                            6
          Section 5.1:  Price Per Physical Barrel                                             6
          Section 5.2:  Flexibility in Supply Source                                          8
          Section 5.3:  Fees, Taxes, Assessments, Levies, etc.                                8
          Section 5.4:  Rounding of Index Averages                                            9
          Section 5.5:  Successor Publications                                                9
ARTICLE 6:  Indemnity                                                                         9
ARTICLE 7:  Pipeline Delivery                                                                 9
          Section 7.1:  LSFO Delivery                                                         9
          Section 7.2:  Determination of Quality                                              9
          Section 7.3:  Measurement of Quantity                                              10
          Section 7.4:  Disputes of Quality                                                  10
          Section 7.5:  Independent Inspection                                               11
ARTICLE 8:  Marine Delivery                                                                  11
          Section 8.1   Notification of Marine Delivery                                      11
          Section 8.2:  Notification of Chevron Use of HECO's BPTF                           12
          Section 8.3:  Delivery of Marine Cargo                                             12
          Section 8.4:  Title and Risk of Loss for a Marine Delivery                         12
          Section 8.5:  Determination of Quantity and Quality                                12
          Section 8.6:  Disputes of Quality                                                  13
ARTICLE 9:  Line Displacement Stock and Blend Stock                                          13
          Section 9.1:  Line Displacement Stock                                              13
          Section 9.2:  Blend Stock                                                          13
ARTICLE 10:  Invoicing and Payment                                                           13
          Section 10.1:  Invoices                                                            13
          Section 10.2:  Ratable Invoicing                                                   14
          Section 10.3:  Payments                                                            14
          Section 10.4:  Method of Payment                                                   14
ARTICLE 11:  Contingencies                                                                   15
          Section 11.1:  Definition of Contingency                                           15
          Section 11.2:  Obligations to Sell                                                 15
          Section 11.3:  Obligations to Purchase                                             15
          Section 11.4:  Price Effectiveness                                                 16
          Section 11.5:  Combustion Specifications                                           16
          Section 11.6:  Effective Date                                                      16
          Section 11.7:  [---]                                                               16
ARTICLE 12:  Effect of Suspension or Reduction                                               17
          Section 12.1:  Notice of Suspension or Reduction                                   17
          Section 12.2:  Option to Terminate                                                 17
          Section 12.3:  Prompt Notices                                                      17
          Section 12.4:  United States Currency                                              17
          Section 12.5:  Substitute Suppliers                                                17
ARTICLE 13:  Waiver and Non-Assignability                                                    17
          Section 13.1:  Waiver                                                              17 
</TABLE>

                                       ii
<PAGE>
 
<TABLE>
<S>                                                                                                    <C>
          Section 13.2:  Non-Assignability                                                              17 
          Section 13.3:  Definitions                                                                    18
ARTICLE 14:  Default                                                                                    18
ARTICLE 15:  Conflicts of Interest                                                                      18
ARTICLE 16:  Applicable Law                                                                             18
ARTICLE 17:  Public Utility Commission Approval                                                         19
          Section 17.1:  Filing Requirements; HECO's Energy Cost Adjustment Clause                      19
          Section 17.2:  Use as a Public Utility                                                        19
ARTICLE 18:  Miscellaneous                                                                              19
          Section 18.1:  Headings                                                                       19
          Section 18.2:  Entire Agreement                                                               19
          Section 18.3:  Contract is Not an Asset                                                       19
          Section 18.4:  Notices                                                                        19
          Section 18.5:  Unenforceable Terms                                                            20
          Section 18.6:  Successors and Assigns                                                         20
          Section 18.7:  Termination of Prior Agreement                                                 20
ADDENDUM No. 1:  Illustrative Schedule of Prices                                                        22
ADDENDUM No. 2:  Quality Adjustments                                                                    33
ADDENDUM No. 3:  Recovery of Worldscale Fixed Differential For Oil Pollution Liability Insurance        35
ADDENDUM No. 4:  Inter Facility Points of Title/Risk of Loss                                            37 
</TABLE>

                                      iii
<PAGE>
 
                      LOW SULFUR FUEL OIL SUPPLY CONTRACT
                      -----------------------------------

THIS CONTRACT dated as of Nov. 14, 1997, by and between CHEVRON PRODUCTS 
                          -------------
COMPANY, A DIVISION OF CHEVRON U.S.A. INC. , a Pennsylvania corporation,
("Chevron") and HAWAIIAN ELECTRIC COMPANY, INC., a Hawaii corporation, ("HECO"),
with the purpose for the sale and purchase of LSFO and other petroleum products.

WHEREAS, Chevron is a supplier of petroleum fuels with terminal and Refinery
facilities in Hawaii.

WHEREAS, HECO is a utility engaged in the generation and sale of electricity,
with terminal facilities, in Hawaii.

NOW THEREFORE, the parties agree as follows:


                            ARTICLE 1:  Definitions

Except where otherwise indicated, the following definitions shall apply
throughout this Contract:

         1.  "API" or "API Gravity" means the American Petroleum Institute's
             standard measurement of gravity for petroleum products, including
             fuel.

         2.  "ASTM" means the American Society for Testing and Materials whose
             standards are utilized in this Contract with respect to fuel
             specifications, quantitative measurements, sampling and testing.

         3.  "barrel" means 42 American bulk gallons at 60 degrees Fahrenheit.

         4.  "BPH" means barrels per hour, a unit of measure of the rate of the
             physical transfer or movement of fuel.

         5.  "BPTF" means HECO's Barbers Point Tank Farm, a fuel receiving,
             storage and distribution facility located in Barbers Point area of
             Oahu, in Campbell Estate Industrial Park, Kapolei, Hawaii.

         6.  "BTU" and "BTU content" means British Thermal Unit and refers to
             the standard assessment of fuel's gross heating value or gross heat
             content.

         7.  "Black Oil Pipeline" means Chevron's 8 inch pipeline running from
             Barbers Point to Honolulu which is used for transporting LSFO to
             the HECO fuel receiving and storage facilities at Waiau and Iwilei
             in addition to the transportation of Chevron's other black
             petroleum products.

         8.  "Certificate of Quality" or "Quality Certificate" means the formal
             document recording the Chevron laboratory determinations of the
             quality and BTU content of a particular sample which represents a
             specific Delivery, said laboratory determinations having been
             performed in accordance with the standard test methods described in
             Article 4.

         9.  "Contingency" means as per the provisions of Section 11.1

         10. "Contract" means this Low Sulfur Fuel Oil Supply Contract, between
             Chevron and HECO, the term of which commences January 1, 1998.

         11. "Day" or "Days" means a calendar day of 24 hours.

                                       1
<PAGE>
 
         12. "Deliver," "Delivery," "Deliveries" or "Delivered" refers to the
             transfer of title or physical movement of LSFO sold by Chevron and
             purchased by HECO.

         13. "Delivery Status Against Ratable" means the calculated figure equal
             to cumulative Deliveries of LSFO as of a specific Day in a Month
             where said Deliveries for the Month which includes the specified
             Day less the cumulative Nominations on a Contract-to-date basis as
             of that same specific Day in a Month.

         14. "Effective Date" means, for the purposes of this Contract, January
             1, 1998.

         15. "Extension" means successive 12-Month periods in the term of this
             Contract in addition to and after the initial term of this Contract
             which is through December 31, 2004, each Extension beginning
             January 1.

         16. "Facilities And Operating Contract" means that certain separate
             agreement by and between Chevron and HECO of even date with this
             LSFO Supply Contract by and between the same parties.

         17. "G.S.V." means gross standard volume in U.S. barrels at 60 degrees
             Fahrenheit.

         18. "Independent Inspector" means a qualified third-party petroleum
             inspection contractor acceptable to both parties providing
             petroleum sampling, measurement and other services before, during
             and after a Delivery.

         19. "Invoiced Deliveries" means Deliveries which have been invoiced in
             accordance with Article 10.

         20. "Invoice Date" means the billing or invoice issue date as shown on
             the invoice which is after completion of the Delivery in question.

         21. "Kahe Pipeline" means HECO's 10 inch pipeline running from Barbers
             Point to the Kahe Power Plant which is used for transporting LSFO
             to the fuel receiving and storage facilities at HECO's Kahe Power
             Plant.

         22. "Line Displacement Stock " means, collectively for this purpose,
             Chevron Diesel Fuel No. 2, Chevron Industrial Fuel Oil No. 6 or
             Chevron Industrial Fuel Oil No. 5 reasonably required for Chevron
             to complete the Deliveries of LSFO into HECO's tankage at Kahe,
             Waiau and Iwilei.

         23. "LSFO" means Low Sulfur Fuel Oil of the quality specified in
             Article 4.

         24. "LSWR" means Low Sulfur Waxy Resid, mixed/cracked quality, a common
             grade of low sulfur fuel oil typically sold in Singapore, Indonesia
             and elsewhere in the Far East.

         25. "Marine Delivery" or "Marine Deliveries" means a Delivery of LSFO
             and/or the components thereof, including blend stock, all or part
             of which are Delivered by Chevron from a marine vessel to HECO's
             receiving and storage tanks.

         26. "MM" means million when used in conjunction with a unit of measure
             such as BTU, i.e. MM BTU means million BTU.

         27. "Month" means a calendar month.
 
         28. "Nominated" or "Nomination" means the amount of LSFO specified by
             HECO to be sold and Delivered by Chevron and purchased and received
             by HECO for a specified Month.

                                       2
<PAGE>
 
         29. "Pipeline Delivery" or "Pipeline Deliveries" means a Delivery of
             LSFO from Chevron's Hawaii Refinery to HECO's petroleum receiving
             and storage tanks at BPTF via Chevron's Refinery pipelines, or to
             HECO's fuel storage at Kahe, Waiau, or Iwilei via HECO's Kahe
             pipeline or Chevron's Black Oil Pipeline, respectively.

         30. "Refinery" means Chevron's oil refining and related facilities
             located in the Barbers Point area of Oahu, in Campbell Estate
             Industrial Park, Kapolei Hawaii

         31. "Year" means a calendar Year.


                         ARTICLE 2:  Term of Contract

The term of this Contract shall be from January 1, 1998 through December 31,
2004, and shall continue thereafter for Extensions beginning each successive
January 1, unless HECO or Chevron gives written notice of termination at least
120 Days before the beginning of an Extension.

                ARTICLE 3:  Purchase Volumes and Delivery Rates

Section 3.1:  Purchase Volumes

During each Year that this Contract is in effect, Chevron shall sell and Deliver
to HECO and HECO shall purchase and receive from Chevron, LSFO at a reasonably
uniform rate during each Month.  This Monthly volume shall equate to an average
daily rate in physical barrels per Day which is no less than the [---] nor more
than [---] as set out below:

             Annual Average Daily Rate in Physical Barrels Per Day
<TABLE>
<CAPTION> 
                            [---]     [---]     [---]     [---]   
             Year           Minimum   Maximum   Minimum   Maximum 
             ----           -------   -------   -------   ------- 
             <S>            <C>       <C>       <C>       <C>     
             1998-1999      [---]     [---]     [---]     [---]   
             2000-2004      [---]     [---]     [---]     [---]    
</TABLE>
The minimum and maximum annual volume of LSFO to be Delivered and sold by
Chevron and to be Nominated, purchased and received by HECO during each of the
Years are as follows:

                     Annual Volume In Thousands Of Barrels
<TABLE>
<CAPTION>
 
                          Year    Minimum     Maximum  
                          ----    -------     -------  
                          <S>    <C>          <C>      
                          1998   [---]        [---]    
                          1999   [---]        [---]    
                          2000   [---]        [---]    
                          2001   [---]        [---]    
                          2002   [---]        [---]    
                          2003   [---]        [---]    
                          2004   [---]        [---]     
</TABLE>

          Pursuant to Section 5.1, the [---] Maximum Annual Average Daily Rate
          in physical barrels per Day, when multiplied by the number of Days in
          each Month, designates the maximum purchase volume during that Month
          which shall occur at [---]
 

                                       3
<PAGE>
 
The minimum and maximum annual volumes to be sold by Chevron and purchased by
HECO during each Year of any extension shall be determined by multiplying the
Days of that Year by the average daily minimum and maximum rates indicated for
Year 2004, unless mutually agreed otherwise. Subject to availability, Chevron
will sell and Deliver and HECO shall purchase and receive such additional
volumes as are mutually agreed.


Section 3.2:  Delivery Rates

     (a)  HECO shall advise Chevron of its Nominated rate of Delivery for
          each Month [---] prior to the beginning of that Month. HECO shall
          provide Chevron written notice of the amount of LSFO to be sold and
          Delivered.

          No later than 10 Days prior to the beginning of each Month, Chevron
          will provide HECO a proposed schedule of Pipeline Deliveries and
          Marine Deliveries ("Delivery Schedule") to be made for the following
          three  Months.  The proposed Delivery Schedule shall specify the type
          of Delivery, Pipeline Delivery or  Marine Delivery, approximate
          quantity and the approximate date.   The Deliveries are to be made at
          reasonably regular intervals.  HECO shall notify Chevron of its
          acceptance or rejection of the proposed Delivery Schedule within three
          (3) business days of receipt. Should HECO fail to provide notice to
          Chevron of its acceptance, conditional acceptance or rejection of the
          Delivery Schedule prior to the end of said three (3)-business-day
          period, HECO shall be deemed to have accepted the Delivery Schedule.
          If HECO rejects the proposed Delivery Schedule because the date or
          volume of an individual Delivery is unacceptable, HECO shall advise
          Chevron as soon as possible thereafter of a satisfactory alternate
          Delivery date or alternate Delivery quantity.

          Chevron shall notify HECO of any change in the accepted Delivery
          Schedule due to any of the following causes with respect to each
          individual Delivery as soon as practicable after it shall become known
          to Chevron:

            1. A change in the volume of an individual Pipeline Delivery, if
               such change is in excess of 10,000 barrels of the previously
               advised Delivery volume or a change in the volume of an
               individual Marine Delivery, if such change is in excess of 25,000
               barrels of the previously advised Delivery volume; or

            2. A change in the date of an individual Delivery, if such change is
               greater than 2 Days from the previously advised date.

     (b)  HECO shall not be required to take Delivery of more than [---] of
          a Month's Nominated volume in any [---] Day consecutive period; and
          Chevron shall not be required to make Delivery of more than [---] of a
          Month's Nominated volume in any [---] Day consecutive period. Chevron
          will make reasonable good faith efforts to plan its Pipeline
          Deliveries and Marine Deliveries such that it shall have a Delivery
          Status Against Ratable of approximately zero at Month-end for the
          third Month of the accepted Delivery Schedule.  Scheduled Marine
          Deliveries can be made plus or minus [---] Days from the date shown on
          the accepted Delivery Schedule.

     (c)  Chevron and HECO shall make best efforts to coordinate their
          separate marine and pipeline shipments into and out of HECO's BPTF to
          minimize operational difficulties and costs, including but not limited
          to tankage availability and vessel demurrage.

     (d)  Unless waived by HECO and subject to tank availability, the
          physical volume of Chevron's Marine Deliveries of LSFO shall be
          limited to [---] barrels, during any [---] Day period and any Month,
          except during Months when Chevron's LSFO production facilities at
          Barbers Point

                                       4
<PAGE>
 
          are not operating or when HECO's Nominated rate of Delivery for the
          Month of the Marine Delivery is in excess of the [---] Maximum
          quantity specified in Section 3.1.

     (e)  If due to reasons other than a Contingency as defined in Article 11,
          Chevron's anticipated Pipeline Deliveries and Marine Deliveries of
          LSFO shall reasonably indicate that the cumulative quantity of its
          Deliveries to HECO during a period of this Contract will result in a
          Delivery Status Against Ratable in excess of [---] barrels for a
          period in excess of [---] consecutive Days, Chevron shall be deemed to
          be in a "Supply Deficit Position" and shall give prompt notice of same
          to HECO.

          In the event that Chevron gives notice that it is in a Supply Deficit
          Position, Chevron and HECO shall thereafter immediately confer in good
          faith on the steps to be taken to minimize the impact of any Supply
          Deficit Position on HECO.  Within three (3) business days of its
          tendering notice of Supply Deficit Position to HECO, Chevron shall
          propose a detailed plan ("Supply Plan") whereby it may make Deliveries
          of LSFO to HECO to address the Supply Deficit Position.

          In the event Chevron has other term contract buyers for LSFO in
          Hawaii, Chevron shall ratably allocate its sale of LSFO to all such
          buyers on the basis of actual sales to each such buyer over the prior
          Year.

     (f)  If due to reasons other than a Contingency as defined in Article 11,
          HECO's anticipated demand for LSFO should reasonably indicate that its
          Monthly Delivery requirements from Chevron during a period of this
          Contract are less than the minimum Monthly or annual volume of LSFO to
          be purchased and received by HECO as set forth in Section 3.1, HECO
          shall be deemed to be in a "Purchase Deficit Position" and shall give
          prompt written notice to Chevron.

          In the event that HECO gives notice that it is in a Purchase Deficit
          Position, Chevron and HECO shall thereafter immediately confer in good
          faith on the steps to be taken to minimize the impact of any Purchase
          Deficit Position on Chevron. [---]

          In such circumstances, purchases of LSFO shall be ratably allocated
          among all sellers including Chevron on the basis of actual sales from
          each seller over the prior Year.


                              ARTICLE 4:  Quality

The LSFO Delivered thereunder shall comply with the following specification
limits:
<TABLE>
<CAPTION>
 
    LSFO               ASTM Test                  Specification    
Specification           Method        Units          Limits        
- -------------           ------        -----          ------        
<S>                    <C>            <C>            <C>           
API Gravity            D4052          Deg            12 min        
                                                     24 max        
                                                                   
Sulfur                 D4292          Wt %          0.50 max       
                                                                   
Flash Point            D93            Deg F          150 min       
                                                                   
Pour Point             D97            Deg F          125 max        
</TABLE>

                                       5
<PAGE>
 
<TABLE>

<S>                   <C>         <C>           <C>
Viscosity             D445          SSU at       l00 min 
                                   210 Deg F     450 max             

Ash                   D482           Wt %       0.05 max
 
BTU content           D240        MM BTU/Bbl    6.000 min
 
Nitrogen              D4629          Wt %       0.50 max
 
Water & Sediment      D1796          Wt %       0.50 max
</TABLE>

CHEVRON MAKES NO WARRANTY, EXPRESSED OR IMPLIED IN FACT OR BY LAW, AS TO THE
MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE CONCERNING THE LSFO OTHER
THAN IT SHALL COMPLY WITH THE QUALITY HEREIN SPECIFIED, AND THAT IT SHALL BE
SUITABLE FOR USE AS A BOILER FUEL.


                               ARTICLE 5:  Price

Section 5.1:  Price Per Physical Barrel

For the Monthly cumulative volume which is at or below the [---] maximum limit
of Section 3.1 multiplied by the number of Days in the Month, the price of LSFO
Delivered to meet the Nominated commitment of a Month shall be determined as
follows:

[---]

For the Monthly cumulative volume which exceeds the Tier 1 maximum limit of
Section 3.1 multiplied by the number of Days in the Month, the price of LSFO
Delivered to meet the Nominated commitment of a Month shall be determined as
follows:

[---]

where:

          P1 = Billing price per physical barrel of LSFO Delivered to meet that
          portion of the Nominated commitment of a Month that is equal to or
          below the [---] maximum regardless of the actual Month Delivered, in
          U. S. dollars.

          P2 = Billing price per physical barrel of LSFO Delivered to meet that
          portion of the Nominated commitment of a Month that exceeds the [---]
          maximum, regardless of the actual Month Delivered , in U.S. dollars.

          LSWR INDEX = A market index for low sulfur fuel oil, defined as the
          average of [---], defined as follows:

          [---], a variable market price component which is a discount or
          premium to the [---] which shall be calculated by a simple averaging
          of the daily high and low or bid and ask of the "Premia to the
          Pertamina Formula" price for Singapore or Singapore/Indonesia cracked,
          mixed/cracked or equivalent LSWR as assessed and published in [---] in
          the date range specified below for [---].

                                       6
<PAGE>
 
      [---]

      (a) [---] for LSWR Mixed/Cracked sold in Singapore, during the period
          beginning the 21st of the second Month immediately preceding the
          Nominated Month of Delivery and ending the 20th Day of the Month
          immediately preceding the Nominated Month of Delivery.

      (b) [---] --- Similarly, the average of the high and low prices per barrel
          published by [---] for every date of publication within the date range
          of [---] above.

      (c) [---] ---- Similarly, the average of the bid and asked prices per
          barrel published by [---] for every date of publication within the
          date range of [---] above.

      (d) [---] ---- Similarly, the average of the prices per barrel published
          by [---] for every date of publication within the date range of [---]
          above.

      FREIGHT = a market index for freight, defined for each calendar
      quarter as the multiplication product of (a) and (b) below, plus the fixed
      rate differential described in (c) below:

      (a) The simple average of the Average Freight Rate Assessment ("AFRA")
          Worldscale Points for the average of Large Range 1 vessels, as
          published Monthly by London Tanker Brokers Panel Limited for the three
          Monthly publications in the calendar quarter immediately preceding the
          calendar quarter of the Nominated Month of Delivery.  Monthly
          publications show rates of vessel voyages which occurred during the
          last half of the second Month immediately preceding that publication
          and the first half of the Month immediately preceding that
          publication, and

      (b) The Worldscale 100 rate for voyages between Singapore and Barbers
          Point, Hawaii, applicable to the Year of the quarter defined in (a)
          above; expressed in New Worldscale rates, as published by Worldscale
          Associates (London Limited) in its New Worldwide Nominal Freight Scale
          (Worldscale); plus,

      (c) There shall be added to the multiplication product of (a) and (b)
          above, a fixed rate differential for segregated ballast tank
          configured oil tankers, "SBT Tankers," if and as provided by
          Worldscale, with respect to the Additional Insurance Premiums for
          Basic ($500 Million) and Excess ($200 Million) coverage of Oil
          Pollution Liability Insurance on vessels carrying persistent oils to
          and from the U.S.A., consistent with a typical vessel as derived in
          Addendum No. 3 attached to this Contract.

     The FREIGHT rate will be expressed in U.S. dollars per barrel, using a
     conversion factor of 6.75 barrels per metric ton.

     LA BUNKER = A market index for industrial fuel oil, defined as the
     simple average of the  high and low prices for  Los Angeles Bunker C fuel
     as reported by the Platt's Oilgram Bunkerwire ("Platt's Bunkerwire") for
     all dates of publication during the period beginning the 21st of the second
     Month immediately preceding the Nominated Month of Delivery and ending the
     20th Day of the Month immediately preceding the Nominated Month of
     Delivery. The LA Bunker market index will be expressed in U.S. dollars per
     barrel, using a conversion factor of 6.368 barrels per metric ton.

                                       7
<PAGE>
 
     [---] volumes sold and purchased in each Year of the indicated period as
     follows:
          1998-1999:            [---] per barrel
          2000-2004/Extension:  [---] per barrel

     [---] volumes sold and purchased in each Year of the indicated period as
     follows:
          1998-1999:            [---] per barrel
          2000-2004/Extension:  [---] per barrel

     The per barrel premium applicable for 2004 shall also apply to sales and
     purchases of LSFO during each Year of any Extension, unless otherwise
     mutually agreed.

     BTU = The actual BTU content of each LSFO Delivery, pursuant to Section
     7.2, expressed in MM BTU's per barrel and rounded to three decimal places.

     T = the [---], the Hawaii General Excise Tax, the Hawaii Environmental
     Response Tax, [---] and any other tax properly imposed on the sale of LSFO
     pursuant to Section 5.3 herein.

The price for LSFO Delivered shall be based on the price for the Month Delivered
to meet the Nominated commitment of a Month regardless of the actual Month
during which physical Delivery occurs.

Addendum No. 1 hereto contains an illustrative schedule of prices calculated
pursuant to this Section 5.1, including a copy of the Monthly London Tanker
Brokers Panel Limited publication.

Section 5.2:  Flexibility in Supply Source

To provide the flexibility needed by Chevron to meet its obligations to HECO,
the source and type of crude oil and other raw material, the place of
manufacture, and the manufacturer of LSFO for Delivery to HECO hereunder shall
be determined solely by Chevron.  The price of all LSFO Delivered by Chevron to
HECO hereunder shall be determined in accordance with the terms of this Contract
regardless of where, how and by whom such LSFO is manufactured and regardless of
the type or source of crude oil or other raw materials used in its manufacture.

Section 5.3:  Fees, Taxes, Assessments, Levies, etc.

In addition to all other amounts payable by HECO under this Contract, HECO shall
reimburse Chevron for all taxes, assessments, levies and imposts of whatsoever
kind or nature imposed on Chevron by any governmental or quasi-governmental
body, as adjusted, modified or revised from time to time, including without
limitation the Hawaii General Excise Tax, the [---], the Hawaii Environmental
Response Tax and [---]s with respect to the [---] sale of LSFO and its
components under this Contract or the receipt by Chevron of payments hereunder.
Notwithstanding the foregoing and any illustrative schedule of prices herein,
HECO shall not be required to reimburse Chevron under this Section 5.3 for any
tax measured by or based on the net income of Chevron or for real property taxes
or to duplicate any item of expense of Chevron which is recovered by Chevron
under the billing price under Section 5.1 or for any item expressly mentioned by
[---] or Platt's Bunkerwire, or confirmed by [---] or Platt's Bunkerwire in
writing upon inquiry by either Chevron or HECO, as being included in a price
used to compute the billing price under Section 5.1.

[---]

                                       8
<PAGE>
 
[---]
As of the effective date of this Contract, the governmental fees, etc. which are
currently in effect are the [---], the Hawaii General Excise Tax (4.166%) the
[---] and the Hawaii Environmental Response Tax ($0.05 per barrel). The Hawaii
General Excise Tax and the Hawaii Environmental Response Tax will be added to
the invoiced price. The Hawaii Environmental Response Tax is not subject to
Hawaii General Excise Tax.

Section 5.4:  Rounding of Index Averages

All prices, index averages, adjustments thereto and other sums payable hereunder
shall be stated in the nearest thousandth of a dollar.

Section 5.5:  Successor Publications

[---] and Platt's Bunkerwire shall include any successor publication(s) and, in
the event of either the discontinuance of any of these publications, the
publications referenced in the derivation of the market index for freight or of
assessments of Singapore/Indonesia mixed/cracked or equivalent quality LSWR, 
[---] or Los Angeles Bunker C Fuel Oil, respectively, the parties shall agree
upon an alternate price reporting services and publications or market price
assessments and any modification of the per barrel premiums for LSWR, price
formula components A1 and A2, as applicable, as may be reasonable under the
circumstances.

                             ARTICLE 6:  Indemnity

Each party agrees to defend, indemnify and hold harmless the other party in
accordance with the provisions of Article 17 of the Facilities And Operating
Contract the terms and conditions of which are hereby incorporated herein and
made a part of this Contract by reference hereto.

The provisions of this Article 6 shall survive the termination of the Contract.


                         ARTICLE 7:  Pipeline Delivery

Section 7.1:  LSFO Delivery

Pipeline Delivery of LSFO from Chevron's Hawaii Refinery shall be made by one of
the following methods:

     (a)  Chevron may Deliver LSFO by pipeline from the Refinery into HECO's
          BPTF.  Title and risk of loss of LSFO so Delivered shall pass to HECO
          where Refinery pipelines interconnect with HECO's BPTF pipelines at
          the point where the pipelines intersect the boundary line between the
          Refinery property and HECO's BPTF property at either point A,
          depending on whether Chevron  Delivers LSFO through the "Front Door
          Line" or "Back Door Line" as shown in Addendum No. 4.

     (b)  Pursuant to the Facilities and Operating Agreement between Chevron and
          HECO, Chevron may Deliver LSFO by pipeline from the Refinery into
          HECO's receiving and storage tanks at Kahe, Waiau and Iwilei. With
          respect to such Deliveries to HECO's receiving and storage tanks at
          Kahe, title and risk of loss of LSFO Delivered from the Refinery shall
          pass to HECO where the

                                       9
<PAGE>
 
          Refinery pipelines interconnect with HECO's Kahe Pipeline at either
          point B shown in Addendum No. 4. With respect to such Deliveries to
          HECO's receiving and storage tanks at Waiau and Iwilei, title and risk
          of loss of LSFO Delivered from the Refinery shall pass to HECO where
          the Refinery pipelines interconnect with Chevron's Black Oil Pipeline
          at either point C as shown in Addendum No. 4.

The use of facilities for Delivery of LSFO pursuant to Section 7.1.(b) of this
Contract, including but not limited to HECO's obligation  to pay a per barrel
pipeline pumping fee for the LSFO Delivered under Section 7.1 (b), the
measurement of the pumped quantities and the terms of sale and Delivery by
Chevron and purchase and receipt by HECO of Line Displacement Stock related to
the Delivery of LSFO, other than the specific provisions set forth in Article 9
herein, shall be governed by the Facilities And Operating Contract.

Section 7.2:  Determination of Quality

The quality and BTU content of the LSFO Delivered by Pipeline Delivery to HECO
shall be determined on the basis of a volumetric weighted average composite of
samples drawn from Chevron's issuing tank(s) at the Refinery in such a manner as
to be representative of each individual Pipeline Delivery ("Tank Final Sample").

The Tank Final Sample shall be divided into a minimum of three (3) parts as
follows:

          (1) One part shall be provided to Chevron's Refinery laboratory for
              analysis to determine BTU content per barrel and quality
              determination.

          (2) One part shall be provided to HECO's laboratory for analysis to
              determine BTU content per barrel and for the purpose of verifying
              Chevron's determinations.

          (3) At least one part shall be sealed and retained by the Independent
              Inspector for a period of not less than three (3) Months.

Chevron agrees to provide HECO and the Independent Inspector with a copy of
Chevron's Certificate of Quality representing the Tank Final Sample and will
make best efforts to provide such quality documentation no later than [---] of
the Pipeline Delivery.  If the completed Certificate of Quality is not available
the Day of the completion of the Pipeline Delivery, Chevron will advise HECO and
the Independent Inspector, by the Day of the completion of the Pipeline
Delivery, the final determination of API gravity, flash point, sulfur content
and sediment and water representing the Tank Final Sample.

The official BTU content determination shall be based upon an average of
Chevron's and HECO's laboratory analyses, provided that such analyses fall
within the ASTM reproducibility standard (currently 0.4 MJ/kg which the parties
shall deem to be equivalent to a fixed standard of 60,000 BTU per barrel) for
Test D-240.  Chevron and HECO will make best efforts to evaluate the BTU content
of the Tank Final Sample and exchange results within    [---] Days.  In the
event  the difference between HECO's and Chevron's laboratory determination of
BTU content falls outside said reproducibility standard, the sealed part of the
Tank Final Sample in the possession of the Independent Inspector shall be
provided to an independent testing laboratory for an official determination,
which shall be final.  In cases of disagreement or excessive delays in HECO's
determination of BTU content, Chevron shall have the right to invoice the sale
using a provisional BTU content of 6.2 MM BTU per barrel, with any required
adjustments made after final determination is made.  Chevron and HECO shall
share equally the cost of independent tests and determinations.

Section 7.3:  Measurement of Quantity

Quantities of LSFO and Line Displacement Stock Delivered by Pipeline Delivery
hereunder shall be determined at the time of the Pipeline Delivery by gauging
Chevron's tanks before and after pumping under the supervision of the
Independent Inspector.  Quantities sold and Delivered by Chevron and purchased
and received by HECO hereunder shall be calculated in accordance with the
current measurement standards adopted by industry, ASTM,

                                       10
<PAGE>
 
API and other recognized standard-setting bodies as are applicable in the
opinion of the Independent Inspector and shall be expressed in G.S.V., U.S.
barrels @ 60 degrees F.

Both HECO and Chevron agree that if measurement of Chevron's tanks is, in the
opinion of the Independent Inspector, considered to have been rendered
inaccurate for any reason including, but not limited to operational constraints,
physical loss of LSFO or Line Displacement Stock or inadvertent transfer of LSFO
or Line Displacement Stock within Chevron's facilities, then the quantity of
LSFO or Line Displacement Stock may be determined by gauging HECO's tanks before
and after pumping under the supervision of the Independent Inspector.

Section 7.4:  Disputes of Quality

If Chevron or HECO has reason to believe that the quality of LSFO or Line
Displacement Stock stated for a particular Pipeline Delivery or Marine Delivery
per Article 7 or Article 8 is incorrect, that party shall within sixty (60) Days
after the issuance date of the complete Certificate of Quality, present the
other party with documents supporting such dispute and the parties will confer,
in good faith, on the causes for the discrepancy and shall proceed to correct
such causes and adjust the quality, if justified, for the Pipeline Delivery or
Marine Delivery in question.  In the event of an unresolvable difference between
Chevron and HECO, the sealed part of the relevant sample in the possession of
the Independent Inspector shall be provided to an independent testing laboratory
for an official determination, which shall be final. Chevron and HECO shall
share equally the cost for such independent laboratory determination.

If the quality of the LSFO received by HECO from Chevron fails to conform to
specifications in Article 4 of this Contract, both Chevron and HECO shall
minimize, if possible, the impact of any quality problem on HECO by
specification waiver if the use of the LSFO will not cause harm to HECO, or by
Chevron delivering higher quality LSFO in a timely manner to produce a
specification quality blend in HECO's receiving and storage tank(s) containing
the non-specification LSFO.  If all such, and similar, efforts fail to resolve
the quality problem, then HECO may return non-specification LSFO to Chevron, in
which case Chevron shall replace the non-specification LSFO in a timely manner.
All costs and expenses, including HECO's handling costs incurred in returning
and replacing non-specification LSFO, shall be paid by Chevron.

Section 7.5:  Independent Inspection

Chevron and HECO will make best efforts to ensure that  all measurements taken
and determinations made with respect to the provisions of this Contract shall be
under the supervision of an Independent Inspector, and the costs thereof, shall
be shared equally by Chevron and HECO.  If, due to a need for timeliness,
Chevron personnel rather than the Independent Inspector take measurements, such
measuring shall be performed in accordance with accepted industry standards
approved by an Independent Inspector.


                          ARTICLE 8:  Marine Delivery

Section 8.1:  Notification of Marine Delivery

Chevron shall provide HECO with updates on the anticipated arrival date of its
vessel and expected date for commencing the Marine Delivery and otherwise comply
with the notice provisions of Section 3.2(a) herein..

Section 8.2:  Notification of Chevron Use of HECO's BPTF

Chevron shall provide HECO at least [---] Days advanced notice of its planned
use of a specified volume of more than [---] barrels, and no more than [---]
barrels, of HECO's petroleum storage capacity at BPTF for Chevron's use in
making a  Marine Delivery to HECO. [---]

                                       11
<PAGE>
 
[---]
Section 8.3:  Delivery of Marine Cargo

Chevron may Deliver LSFO or LSFO blend stock from Chevron's vessel into BPTF.
The volume of Chevron's Marine Delivery  shall conform to the provisions of
Section 3.2(a) herein unless it has received prior written approval from HECO.

Section 8.4:  Title and Risk of Loss for a Marine Delivery

Title to the LSFO and the risk of loss of the LSFO and components Delivered from
Chevron's vessel or from the Refinery in conjunction with a Marine Delivery
shall pass from Chevron to HECO at the BPTF as soon as the [---]

Section 8.5:  Determination of Quantity and Quality

The quantity and quality of LSFO Delivered by marine vessel shall be determined
in the manner specified in Sections 7.2, 7.3 and 7.4 of this Contract, except as
follows:

      (a) Chevron agrees to advise the Independent Inspector, prior to
          commencing a Marine Delivery of LSFO or any component thereof from
          Chevron's vessel, the API gravity and flash point in degrees F. shown
          the port of loading Quality Certificate representing the quality of
          said LSFO or component thereof.

      (b) In order to reduce the likelihood of Chevron's Marine Delivery
          resulting in quality problems occurring in HECO's receiving tank(s),
          Chevron agrees to test a volumetric weighted average composite of
          samples representative of the LSFO or component thereof to be shipped
          to HECO's receiving tanks ("Precautionary Sample"). The Precautionary
          Sample shall be drawn after the arrival of the vessel in Hawaiian
          waters, but prior to the commencement of the Marine Delivery, and
          shall be tested by Chevron's Refinery laboratory.  Chevron agrees that
          should a pre-discharge computer blend simulation representing the
          quality of a volumetric weighted average mixture of the Precautionary
          Sample, components of the Marine Delivery in questions previously
          shipped to HECO's receiving tanks and other LSFO components available
          to be shipped from Chevron's Refinery reasonably indicate the Marine
          Delivery in question will not conform to the quality specified in
          Article 4, Chevron will instruct the vessel operator not to commence
          Delivery of its cargo to HECO's receiving tanks without HECO's express
          permission.

      (c) The quality and BTU content of the LSFO Delivered shall be determined
          on the basis of a volumetric weighted average composite of samples
          drawn from HECO's receiving tank(s) in such manner as to be
          representative of the entire Marine Delivery (also "Tank Final
          Sample"). The Tank Final Sample shall be divided and otherwise handled
          in accordance with the provisions of Section 7.2.

      (d) Quantity of the LSFO Delivered via a Marine Delivery shall be
          determined at the time of each Marine Delivery by gauging HECO's
          tank(s) before and after pumping.  Quantities sold and Delivered
          pursuant to this Section 8.5 shall be calculated in accordance with
          the current measurement standards adopted by industry, ASTM, API and
          other recognized standard-setting bodies as are applicable in the
          opinion of the Independent Inspector and shall be expressed in G.S.V.,
          U.S. barrels @ 60 degrees F.

                                       12
<PAGE>
 
Section 8.6:  Disputes of Quality

If Chevron or HECO has reason to believe that the quality of LSFO stated for an
individual Marine Delivery is not in conformance with the qualities described in
Article 4 , Chevron and HECO shall attempt to resolve the quality problem
pursuant to the provisions of  Section 7.4.


              ARTICLE 9:  Line Displacement Stock and Blend Stock

Section 9.l:  Line Displacement Stock

HECO shall purchase and Chevron shall supply whatever volume of Line
Displacement Stock is reasonably required for Chevron to complete the Deliveries
of LSFO that is received into HECO's tankage at Kahe, Waiau and Iwilei.  The
price of No. 2 diesel fuel or No. 6 fuel oil used as Line Displacement Stock
shall be the then-current pricing for the fuel comprising the Line Displacement
Stock in that certain separate agreement between Chevron and HECO and its
affiliated companies of even date herewith, known as the Inter-Island Industrial
Fuel Oil and Diesel Fuel Contract ("Inter-Island Supply Contract"), if such a
supply contract is in effect; otherwise its price shall be the then-current
Honolulu posted price for such fuel, less normally available discounts, if any,
at the time of purchase.  The price of No. 5 fuel oil used as Line Displacement
Stock shall be the [---] in the Inter-Island Supply Contract, if such a supply
contract is in effect; otherwise its price shall be the then-current Honolulu
posted price for No. 5 fuel oil, less normally available discounts, if any, at
the time of purchase.  HECO's minimum purchase obligation and Chevron's maximum
purchase obligation set forth in Article 3 shall be reduced by each physical
barrel of Line Displacement Stock sold.

Section 9.2:  Blend Stock

In the event HECO desires to adjust the quality of its LSWR in its BPTF
receiving and storage tanks to meet the specifications of Article 4, Chevron
shall supply the necessary blend stock pursuant to Addendum  No. 2 given
reasonable notice.


                       ARTICLE 10:  Invoicing and Payment

Section 10.1:  Invoices

Invoices, which will show the price per physical barrel of LSFO, blend stock and
Line Displacement Stock sold will be prepared and dated following Delivery shall
be rendered from time to time each Month.  Original invoices shall include full
documentation, as approved by both parties including Certificate of Quality,
report of the Independent Inspector, and price calculation; such documentation
may, however, be provided by Chevron to HECO separately.  The invoices shall
also show as a separate item the estimated amounts of any reimbursements to
which Chevron is entitled pursuant to Section 5.3.

If an invoice incorporating an item other than a BTU content adjustment in
error, or has been sent to HECO, then HECO shall have the option to hold said
invoice without penalty until such error or dispute is resolved and HECO shall
have received a corrected invoice, debit or credit.  HECO shall make payment for
such corrected invoice or debit in accordance with this Section 10.3.  If a
disputed item has not been resolved in 30 Days from the Invoice Date, HECO shall
pay the undisputed amount.

If Chevron's or HECO's final laboratory result for BTU content is unavailable or
if Chevron's laboratory result is disputed by HECO, Chevron may issue a
provisional invoice pursuant to Section 7.2.  HECO shall in such case make
payment for such provisional invoice in accordance with the provisions of
Section 10.3.

                                       13
<PAGE>
 
Section 10.2: [---]

[---]

Section 10.3:  Payments

Payments of such invoices shall be made in U.S. dollars.  Subject to Section
10.1, Section 10.2, Section 7.4 and Section 8.6 herein, the timing of payments
for sales and Deliveries received shall be based upon the invoice issue date
which shall be the Invoice Date or postmarked mailing date of the invoice,
whichever is later, as follows:

      (a) Payment for a received invoice dated from the 1st through the 10th of
          a Month is due on the 20th of the same Month.

      (b) Payment for a received invoice dated from the 11th through the 20th of
          a Month is due by the last Day of the same Month.

      (c) Payment for a received invoice dated from the 21st through the last
          Day of the Month is due on the 10th Day of the following Month.

Due dates are the dates payments are to reach Chevron.  If the due date falls on
a Saturday, the payment shall be received on the preceding business Day.  If
such date falls on a Sunday or a holiday, payment shall be received  the
following business Day.

Section 10.4:  Method of Payment

Payments shall be by bank wire transfer of immediately available funds to:

          Chevron Products Company, a division of Chevron U.S.A. Inc.
                            Account Number 59-51755
                  First National Bank of Chicago, Chicago, IL
                             ABA Ref. No. 071000013

For identification purposes, all wires must clearly indicate that payment is
being made by order of HECO and provide the invoice reference number.  In
addition, written documentation evidencing specific invoices being paid shall be
immediately forwarded to:

                       Utility Fuel Receivables/Room 3338
           Chevron Products Company, a division of Chevron U.S.A. Inc
                                 P.O. Box 7006
                     San Francisco, California  94120-7006
                               Fax (415) 894-1195


                           ARTICLE 11:  Contingencies

Section 11.1:  Definition of Contingency

As used in this Article 11, the term "Contingency" means:

     (a)  any event reasonably beyond the control of the party affected;

                                       14
<PAGE>
 
     (b)  compliance, voluntary or involuntary, with a direction or request of
          any government or person purporting to act with governmental
          authority; excluding, however, any such direction or request
          restricting or otherwise regulating combustion of the LSFO to be
          purchased by HECO hereunder, the effect of which restrictions or
          regulation upon the parties' performance shall be governed by Section
          11.5 of this Contract;

     (c)  total or partial expropriation, nationalization, confiscation,
          requisitioning or abrogation or breach of government contract or
          concession;

     (d)  closing of, or restriction on the use of, a port or pipeline;

     (e)  maritime peril (including but not limited to, negligence in navigation
          or management of vessel, collision, stranding, destruction, or loss of
          vessel), storm, earthquake, flood;

     (f)  accident, fire, explosion;

     (g)  hostilities or war (declared or undeclared), embargo, blockage, riot,
          civil unrest, sabotage, revolution, insurrection;

     (h)  strike or other labor difficulty (whomever's employees are involved),
          even though the strike or other labor difficulty could be settled by
          acceding to the demands of a labor group; or

     (i)  loss or shortage of supply, production, manufacturing, distribution,
          refining, transportation, Delivery facilities, receiving facilities,
          equipment, labor, material, power generation or power distribution
          caused by circumstances which the affected party is not able to
          overcome by the exercise of reasonable diligence or which the affected
          party is able to overcome only at substantial additional expense in
          relation to the expected revenue, benefits or rights related directly
          to this Contract.

Section 11.2:  Obligations to Sell

Chevron shall not be obligated to sell or Deliver LSFO to the extent that
performance of this Contract is prevented, restricted or delayed by a
Contingency which significantly affects Chevron's ability to supply, manufacture
or transport LSFO to HECO under this Contract from Chevron's U.S. West Coast (to
the extent Chevron's U.S. West Coast refineries are producing LSFO at the time
of the Contingency) and Refinery.  In such circumstances, Deliveries of LSFO to
HECO may be reduced on a basis as equitable to HECO as to Chevron's and its
Affiliates' other customers of crude and petroleum products, and Chevron shall
not be obligated to acquire additional crude or LSFO but to the extent that it
does acquire additional crude or LSFO, HECO shall be entitled to an equitable
share of the LSFO acquired or derived from the crude acquired, at a price to be
agreed from time-to-time.

Section 11.3:  Obligations to Purchase

HECO shall not be obligated to purchase, receive or use LSFO to the extent that
performance of this Contract in the customary manner is prevented, restricted or
delayed by a Contingency.  In such circumstances, purchases from Chevron may be
reduced on any basis as equitable to Chevron as to HECO's other suppliers of
LSFO.

Section 11.4:  Price Effectiveness

If at any time any price determined under this Contract cannot be given effect
because to do so would violate a direction or request of any government or
person purporting to act with governmental authority, HECO and Chevron shall
attempt to agree on an alternate course of action, but failing agreement within
ten (10) Days the party adversely affected may suspend performance with respect
to the quantity of LSFO affected by the direction or request.

                                       15
<PAGE>
 
Section 11.5:  Combustion Specifications

To the extent that any governmental regulation requires combustion of LSFO
meeting more stringent specifications or permits combustion of LSFO meeting less
stringent specifications than those in Article 4, HECO and  Chevron shall
negotiate in good faith to agree on an alternative course of action that will
reasonably allow  HECO to comply with such regulation while fulfilling its
minimum annual purchase volume commitment  under Article 3, at a price and on
other terms and conditions that are fair to both parties.  Chevron shall have no
obligation to Deliver LSFO meeting new specifications if it is not available for
purchase from third parties and Chevron cannot manufacture such LSFO in existing
facilities without substantial new capital investment. If HECO and Chevron do
not agree on such an alternate course of action, then [---]

To the extent HECO is unable to utilize fuel to be supplied by Chevron under
this Contract, but [---], then purchases from Chevron may be reduced on any
basis as equitable to Chevron as to HECO's other suppliers of similar fuel  oil.

Any adjustments in price pursuant to this Section 11.5 shall be governed by
Section 11.6, except that the adjustments shall apply to all LSFO Delivered
which meets the [---].

Section 11.6:  Effective Date

In the event of retroactive adjustments hereunder, the charge or credit to HECO
shall be computed and billed to HECO as soon as practical after the adjustment
is known.  In the event of retroactive changes which cause adjustments hereunder
after termination of this Contract, payment shall be made within fifteen (15)
Days after receipt of written demand therefor by the other party.

Section 11.7: [---]

[---]

                 ARTICLE 12:  Effect of Suspension or Reduction

Section 12.1:  Notice of Suspension or Reduction

In the event of any suspension or reduction of sales and Deliveries under
Article 11, Chevron shall not be obligated to sell and HECO shall not be
obligated to buy, after the period of suspension or reduction, the undelivered
quantity of LSFO which normally would have been sold and Delivered hereunder
during the period of suspension or reduction.

                                       16
<PAGE>
 
Section 12.2:  Option to Terminate

If sales and Deliveries are suspended under Article 11 for more than 180 Days,
Chevron or HECO shall have the option while such suspension continues to
terminate its obligations to the other party under this Contract on thirty (30)
Days written notice to the other party.

Section 12.3:  Prompt Notices

Any party which relies upon Article 11 shall give the other party prompt notice
thereof specifying the anticipated amount and duration of any suspension or
reduction of Deliveries.  It shall also give prompt notice when it no longer
expects to rely on Article 11 and Deliveries shall be reinstated subject to all
conditions of this Contract, unless this Contract has been terminated previously
under Section 12.2.

Section 12.4:  United States Currency

Nothing in Article 11 shall relieve HECO of the obligation to pay in full in
United States currency for the LSFO sold and Delivered hereunder and for other
amounts due by HECO to Chevron under this Contract.

Section 12.5:  Substitute Suppliers

While Deliveries are suspended or reduced by Chevron pursuant to Article 11, it
shall not be a breach of this Contract for HECO to buy from a supplier other
than Chevron the quantities of LSFO which Chevron does not Deliver.  During this
period of time there will be no minimum volume requirements.  After any
suspension or reduction has ended, minimum and maximum volume requirements of
Article 3 for the annual period in which the suspension or reduction occurred
will be reduced in proportion to the ratio of the number of Days within the
annual period during which no suspension or reduction was in effect, to the
number of Days within the annual period.


                   ARTICLE 13:  Waiver and Non-Assignability

Section 13.1:  Waiver

Waiver by one party of the other's breach of any provision of this Contract
shall not be deemed a waiver of any subsequent or continuing breach of such
provisions or of the breach of any other provision or provisions hereof.

Section 13.2:  Non-Assignability

This Contract shall not be assignable by either party without the written
consent of the other, which shall not be unreasonably withheld, except that
either party may assign this Contract to any Affiliate, provided that any such
assignment shall not release that party from any of its obligations hereunder,
and except that HECO may assign this Contract to the Trustee under its First
Mortgage Bond Indentures.  Chevron does not, by agreement to such an assignment,
waive any right it may have to terminate this Contract for any breach hereof
occurring at any time before or after any such assignment or release HECO of any
obligations arising under this Contract after any such assignment.  Following
any such assignment, no further assignment may be made without the consent of
Chevron.

Section 13.3:  Definitions

In this Article 13 and Sections 11.2 and 11.7, "Affiliate" shall mean any
corporation controlling, controlled by or under common control, with either
Chevron or HECO.  "Control" of a corporation shall mean ownership, directly or
indirectly, or at least 50% of the voting shares of such corporation.

                                       17
<PAGE>
 
                              ARTICLE 14:  Default

If HECO or Chevron considers the other party to be in default of any obligation
under this Contract, such party shall give the other party notice thereof.  Such
other party shall then have thirty (30) Days in which to remedy such default.
If the default is not remedied, the other party may, without prejudice to any
other right or remedy of such party in respect of such breach, terminate its
obligations under this Contract, except for HECO's obligation to pay in full in
United States currency for the LSFO sold and Delivered hereunder and for other
amounts due by HECO to Chevron under this Contract, by forty-five (45) Days
written notice to the party in breach.  Any termination shall be without
prejudice to accrued rights.  All rights and remedies hereunder are independent
of each other and election of one remedy shall not exclude another.

In no event shall either party be liable for any indirect, consequential,
special or incidental damages of any kind whether based in contract, tort
(including without limitation negligence or strict liability), warranty or
otherwise.


                       ARTICLE 15:  Conflicts of Interest

Conflicts of interest related to this Contract are strictly prohibited. Except
as otherwise expressly provided herein, neither party nor any director, employee
or agent of a party shall give to or receive from any director, employee or
agent of the other party any gift, entertainment or other favor of significant
value, or any commission, fee or rebate.  Likewise, neither party nor any
director, employee or agent of a party shall enter into any business arrangement
with any director, employee or agent of the other party (or any affiliate),
unless such person is acting for and on behalf of the other party,  without
prior written notification thereof to the other party.

In the event of any violation of this Article 15, including any violation
occurring prior to the date of this Contract which resulted directly or
indirectly in one party's consent to enter into this Contract with the other
party, such party may, at its  sole option, terminate this Contract at any time
and, except for obligations to pay in full in United States currency for the
outstanding payment obligations hereunder, shall be relieved of any further
obligation under this Contract.

Both parties agree to immediately notify the other of any known violation of
this Article.


                          ARTICLE 16:  Applicable Law

This Contract shall be construed in accordance with, and all disputes arising
hereunder shall be determined in accordance with, the local law of the State of
Hawaii, U.S.A.


                ARTICLE 17:  Public Utility Commission Approval

Section 17.1:  Filing Requirements; HECO's Energy Cost Adjustment Clause

This Contract is required to be filed with the Hawaii Public Utilities
Commission ("PUC") for approval.  If in the proceedings initiated as a result of
the filing of this Contract, the PUC disapproves or fails to authorize the full
recovery of the fuel costs incurred under this Contract through HECO's "Energy
Cost Adjustment Clause", HECO may terminate this Contract by giving sixty (60)
Days written notice to Chevron.

Section 17.2:  Use as a Public Utility.

No use of the pipelines, facilities or equipment owned by Chevron and used in
connection with this Contract shall be construed as having been dedicated by
Chevron to a public use and it is hereby acknowledged by the parties that
Chevron retains the exclusive right to determine who other than the parties to
this Contract shall use said pipelines, facilities, and equipment.

                                       18
<PAGE>
 
                           ARTICLE 18:  Miscellaneous

Section 18.1:  Headings

Headings of the Articles and Sections are for convenient reference only and are
not to be considered part of this Contract.

Section 18.2:  Entire Agreement

This document contains the entire agreement between the parties covering the
subject matter and cancels, as of the effective date hereof, all prior
agreements of any kind between the parties covering such subject matter and any
amendments thereto.  There are no other agreements which constitute any part of
the consideration for, or any condition to, either party's compliance with its
obligations under this Contract.

Section 18.3:  Contract is Not an Asset

This Contract shall not be deemed to be an asset in, and, at the option of a
party, shall terminate in the event of any voluntary or involuntary
receivership, bankruptcy or insolvency proceedings affecting the other party.

Section 18.4:  Notices

Except as otherwise expressly provided herein, all notices shall be given in
writing, by letter, facsimile or electronic mail  to the following addresses, or
such other address as the parties may designate by notice, and shall be deemed
given upon receipt.

               Seller:
               Manager, Petroleum Coke, Heavy Fuels & Sulfur
               Chevron Products Company,
               A Division of Chevron U.S.A. Inc
               P.O. Box 7006
               San Francisco, CA  94120-7006
               Facsimile:  (415) 894-1195

 

                                       19
<PAGE>
 
               Buyer:
               Manager,
               Power Supply Services Department
               Hawaiian Electric Company, Inc.
               Box 2750
               Honolulu, HI  96840-0001
               Facsimile:  (808) 543-4366

Section 18.5:  Unenforceable Terms

If any term or provision, or any part of any term or provision, of this Contract
is held by any court or other competent authority to be illegal or
unenforceable, the remaining terms, provisions, rights and obligations shall not
be affected.

Section 18.6:  Successors and Assigns

This Contract shall inure to the benefit of and be binding upon the parties
hereto, their successors and permitted assigns.

Section 18.7:  Termination of Prior Agreement

Effective as of the Effective Date of the Term hereunder, this Contract hereby
supersedes that certain Low Sulfur Fuel Oil Supply Contract between the parties
dated November 20, 1995, and all amendments thereto.

                                       20
<PAGE>
 
          IN WITNESS WHEREOF, the parties hereto have executed this Low Sulfur
Fuel Oil Supply Contract as of the Day and Year first herein above written.



CHEVRON PRODUCTS COMPANY,                     HAWAIIAN ELECTRIC
 A DIVISION OF CHEVRON U.S.A. INC.             COMPANY, INC.


By  /s/ Phillip H. Fisher                     By   /s/ Edward Y. Hirata
   ----------------------                          -----------------------
        Phillip H. Fisher                              Edward Y. Hirata
                                                   -----------------------
                                                   (Printed or Typed Name)

 
Its Manager, Petroleum Coke            Its  Vice President, Regulatory Affairs
  Heavy Fuels & Sulfur                      ----------------------------------
  

 


                                              By   /s/ Marvin A. Hawthorne
                                                  ------------------------
                                                       Marvin A. Hawthorne
                                                  ------------------------
                                                   (Printed or Typed Name)

                                              Its  Assistant Treasurer
                                                   -------------------

                                       21
<PAGE>
 
                                 ADDENDUM NO. 1

                        ILLUSTRATIVE SCHEDULE OF PRICES
                        -------------------------------
          (Illustrative Product Price Calculation for September 1997)

For the Monthly cumulative volume which is at or below the [---] maximum limit
of Section 3.1 multiplied by the number of Days in the Month, the price of LSFO
Delivered to meet the Nominated commitment of a Month shall be determined as
follows:

[---]

Where P1 is equal to the billing price per physical barrel of LSFO Delivered to
meet that portion of the Nominated commitment of a Month that is equal to  or
below the [---] maximum regardless of the actual Month Delivered, in U. S.
dollars.

I. LSWR INDEX = A market index for low sulfur fuel oil, defined as the [--],
                defined as follows:

 [---]

[---]

[---]  (Price in USD per barrel)

 Date     Low     High  Average
 ----     ---     ----  -------

 [---]    [---]   [---]  [---]

                                       22
<PAGE>
 
[---]  (Price in USD per barrel)

 Date     Low     High      Average
 ----     ---     ----      -------

 [---]    [---]   [---]      [---]
               [---]    

 Average of the two assessments,

 [---]

 [---] =                    [---]


 [---] The value of the [---]  shall be [---] under this Contract [---].

 [---]

                                       23
<PAGE>
 
[---]

(a) [---] ---- The  average of [---] for all [---], during the period [---].
 
 Date        Low         High     Average
 ----        ---         ----     -------

 [---]      [---]        [---]     [---]
                   
            AVERAGE PRICE   [---]
 
(b) [---] --- Similarly, the average of [---]  for [---].
 
 Date        Low         High     Average
 ----        ---         ----     -------

 [---]      [---]        [---]     [---] 

                                       24
<PAGE>
 
[---]
               AVERAGE PRICE  [---]

(c) [---] ---- Similarly, the average of the [---].

 Date      Low      High     Average
 ----      ---      ----     -------

[---]     [---]     [---]     [---]
 
                  AVERAGE PRICE     [---]

(d) [---] ---- Similarly, the average of the [---] for [---].

 Date     Average
 ----     -------

 [---]     [---]

                                       25
<PAGE>
 
 [---]
 AVERAGE PRICE [---]

 Average of the [---],

 [---]

 [---]  =           [---]


 [---]

 [---]  =           [---]


II. [---] = [---]:

(a) [---]

                                       26
<PAGE>
 
AFRA Worldscale Large Range 1 average     New Worldscale Large Range 1
         Publication Date                            Points

             April 1997                              131.10            
             May 1997                                141.30            
             June 1997                               139.90            
                                                     ------            
 Average                                             137.43            

(b) The Worldscale 100 rate for voyages between Singapore and Barbers Point,
    Hawaii, applicable to the Year of the quarter defined in (a) above;
    expressed in New Worldscale rates, as published by Worldscale Associates
    (London Limited) in its New Worldwide Nominal Freight Scale (Worldscale);
    plus,

          New Worldscale 100 Rate between Singapore and Barbers Point effective
          January 1, 1997

          = $10.11 PER METRIC TON

(c) There shall be added to the multiplication product of (a) and (b) above, a
    fixed rate differential for SBT Tankers, if and as provided by Worldscale,
    with respect to the Additional Insurance Premiums for Basic ($500 Million)
    and Excess ($200 Million) coverage of Oil Pollution Liability Insurance on
    vessels carrying persistent oils to and from the U.S.A., consistent with a
    typical vessel as derived in Addendum No. 3 attached to this Contract.

          New Worldscale fixed rate differential for Additional Insurance
          Premiums for Oil Pollution Liability Insurance for SBT Tankers
          effective February 20, 1997

          = $0.023 PER BARREL

The FREIGHT rate will be expressed in U.S. dollars per barrel, using a
conversion factor of 6.75 barrels ("bbls") per metric ton ("MT").

FREIGHT   =    {[(137.43 * $10.11/MT) / 100] / 6.75 bbls/MT} + ($0.023/bbl)

          =    $ 2.081/BBL


iii. LA BUNKER = A market index for industrial fuel oil, defined as the simple
     average of the high and low prices for Los Angeles Bunker C fuel as
     reported by the Platt's Oilgram Bunkerwire ("Platt's Bunkerwire") for all
     dates of publication during the period beginning the 21st of the second
     Month immediately preceding the Nominated Month of Delivery and ending the
     20th Day of the Month immediately preceding the Nominated Month of
     Delivery.
<TABLE>
<CAPTION>
 
Date            Low      High            Average
- ----            ---      ----            -------          
<S>           <C>       <C>       <C>
07/21/97      $100.00   $104.00   $102.00 per Metric Ton
07/22/97      $ 95.00   $101.00   $98.00 per Metric Ton
07/23/97      $ 97.00   $100.00   $98.50 per Metric Ton
07/24/97      $ 97.00   $103.50   $100.25 per Metric Ton
07/25/97      $100.00   $104.00   $102.00 per Metric Ton
07/28/97      $100.00   $105.00   $102.50 per Metric Ton
07/29/97      $100.00   $105.00   $102.50 per Metric Ton
07/30/97      $101.00   $105.00   $103.00 per Metric Ton
07/31/97      $104.00   $108.00   $106.00 per Metric Ton
</TABLE>

                                       27
<PAGE>
 
<TABLE>
<S>           <C>       <C>       <C>
08/01/97      $103.00   $107.00   $105.00 per Metric Ton
08/04/97      $103.00   $107.00   $105.00 per Metric Ton
08/05/97      $103.00   $107.00   $105.00 per Metric Ton
08/06/97      $101.00   $104.00   $102.50 per Metric Ton
08/07/97      $101.00   $104.00   $102.50 per Metric Ton
08/08/97      $102.00   $105.00   $103.50 per Metric Ton
08/11/97      $ 97.00   $102.00   $99.50 per Metric Ton
08/12/97      $ 98.00   $102.00   $100.00 per Metric Ton
08/13/97      $ 93.00   $100.00   $96.50 per Metric Ton
08/14/97      $ 95.00   $100.00   $97.50 per Metric Ton
08/15/97      $ 97.00   $101.00   $99.00 per Metric Ton
08/18/97      $ 96.00   $ 99.00   $97.50 per Metric Ton
08/19/97      $ 93.00   $101.00   $97.00 per Metric Ton
08/20/97      $ 93.00   $ 98.00   $95.50 per Metric Ton
</TABLE>

          AVERAGE             $100.902 PER METRIC TON
 
The LA Bunker market index will be expressed in U.S. dollars per barrel, using a
conversion factor of 6.368 barrels per metric ton.

= ($100.902/MT)/(6.368 bbls/MT)

LA BUNKER =    $15.845/BBL

iv. [---] =  [---]


v.  BTU = The actual BTU content of each LSFO Delivery, pursuant to Section 7.2,
    expressed in MM BTU's per barrel and rounded to three decimal places.


T = [---], the Hawaii General Excise Tax, the Hawaii Environmental Response Tax,
    [---] and any other tax properly imposed on the sale of LSFO pursuant to
    Section 5.3 herein.

          [---]

          [---]

          HGET = 4.166% of pre-HGET price

          Hawaii Environmental Response Tax applied after HGET and Hawaii Use
          Tax = $0.05 per barrel

                                       28
<PAGE>
 
A. PRODUCT PRICE COMPUTATION FOR [---] DELIVERY WITH STANDARD BTU CONTENT OF 6.2
   MM BTU PER BARREL

[---] = [---]

      = [---]

      = [---]

      = [---]

where T = sum of
<TABLE> 
      <S>                                                                         <C> 
      [---]  =                                                                        [---]
      HGET = 4.166% of LSWR Index + [---] =                                           [---]
      [---]  =                                                                        [---]
      Hawaii Environmental Response Tax =                                             $0.0500/bbl
                                                                                      -----------
                                                                                      [---]
</TABLE> 

[---] = [---]

      = [---]  PER BARREL



B. PRODUCT PRICE COMPUTATION FOR [---] DELIVERY WITH BTU CONTENT OTHER THAN
   STANDARD 6.2 MM BTU PER BARREL

[---] = [---]

IF BTU IS 6.275 MM BTU PER BARREL, THEN COMPUTATION IS AS FOLLOWS:

      = [---]

      = [---]

      = [---]

      = [---]

where T = sum of

      [---] =                                                   [---]
      HGET = 4.166% of LSWR Index + [---] =                     [---]
      [---]) =                                                  [---]
      Hawaii Environmental Response Tax =                       $0.0500/bbl
                                                                -----------
                                                                [---]

                                       29
<PAGE>
 
[---] = [---]

      = [---]  PER BARREL

For the Monthly cumulative volume which exceeds the [---] maximum limit of
Section 3.1 multiplied by the number of Days in the Month, the price of LSFO
Delivered to meet the Nominated commitment of a Month shall be determined as
follows:

[---]

Where P2 equals the billing price per physical barrel of LSFO Delivered to meet
that portion of the Nominated commitment of a Month that exceeds the [---]
maximum, regardless of the actual Month Delivered , in U.S. dollars.

iv.   [---]

        [---]

C. PRODUCT PRICE COMPUTATION FOR [---] DELIVERY WITH STANDARD BTU CONTENT OF 6.2
   MM BTU PER BARREL

[---] = [---]

      = [---]

      = [---]

      = [---]

where T = sum of

      [---]  =                                                  [---]
      HGET = 4.166% of LSWR Index + [---]  =                    [---]
      [---] =                                                   [---]
      Hawaii Environmental Response Tax =                       $0.0500/bbl
                                                                -----------
                                                                [---]

[---] = [---]

      = [---]  PER BARREL



D. PRODUCT PRICE COMPUTATION FOR [---]  DELIVERY WITH BTU CONTENT OTHER THAN
   STANDARD 6.2 MM BTU PER BARREL

[---] = [---]

                                       30
<PAGE>
 
IF BTU IS 6.275 MM BTU PER BARREL, THEN COMPUTATION IS AS FOLLOWS:

    = [---]

    = [---]

    = [---]

where T = sum of

    [---]  =                                                  [---]
    HGET = 4.166% of LSWR Index +[---]  =                     [---]
    [---]  =                                                  [---]
    Hawaii Environmental Response Tax =                       $0.0500/bbl
                                                              -----------
                                                              [---]

[---] = [---]

      = [---]  PER BARREL



Note on items as they appear on invoices
- ----------------------------------------
Actual invoices for sales and Deliveries of LSFO may include additional charges
for pipeline throughput and pipeline displacement stock incurred under the
Facilities and Operating Contract by and between the same parties and for which
certain taxes, such as the HGET and [---], are consolidated with the
corresponding tax charged on the sale of LSFO.

Actual invoices for sales and Deliveries of LSFO may also contain comments which
reference the measured BTU content of the invoiced Delivery, calculated LSFO
price per unit before BTU content adjustment and per unit amount of pipeline
throughput charge, if any.

                                       31
<PAGE>
 
[ LONDON TANKER BROKERS' PANEL LIMITED letterhead ]



                                                                   1st June 1997



Hawaiian Electric Company Inc
P.O. Box 2750
Honolulu HI  96840-0001
Hawaii



Attn:  Mr. J.C. Aicken Dir. Fuel Resource

Dear Sirs

                                      AFRA

The results of the monthly average freight rate assessments made
over the period 16th April 1997/15th May 1997 are as follows:

MEDIUM RANGE       ( 25,000/ 44,999    (LONG)  TONS)     WORLDSCALE   175.8
LARGE RANGE 1      ( 45,000/ 79,999    (LONG)  TONS)     WORLDSCALE   139.9
LARGE RANGE 2      ( 80,000/159,999    (LONG)  TONS)     WORLDSCALE   100.8
VLCC               (160,000/319,999    (LONG)  TONS)     WORLDSCALE    57.9
ULCC               (320,000/549,999    (LONG)  TONS)     WORLDSCALE    49.4

We would remind you that, in accordance with the agreement
between us, these assessments are provided to you on the
condition they will not be reproduced, supplied or disclosed to
any other person.

Your faithfully
LONDON TANKER BROKERS' PANEL LIMITED


/s/ R.W. Porter


R.W. Porter
Managing Director

                                       32
<PAGE>
 
                                 ADDENDUM NO. 2
                              QUALITY ADJUSTMENTS

Section 1:  Adjustments to Quality of HECO's Oil

In the event HECO desires to adjust the quality of its LSWR in its BPTF tanks to
meet the specifications of Article 4 and provided that the LSWR meets the
qualities of Section 2(a), Chevron shall supply the necessary blend stock,
quality analysis and other services necessary to complete the adjustment.   HECO
will provide LSWR of the quality generally available in the Singapore market.

Section 2:  Quality and Quantity Determination

      (a) HECO shall give Chevron 70 Days advance notice of the quantity and
          quality of any LSWR for which it desires an adjustment. The LSWR shall
          meet the following viscosity-sulfur relationship:
<TABLE> 
<CAPTION> 
                                  LSWR Viscosity - cst at 122F
                          ----------------------------------------------
                                       Maximum For Pipeline Delivery
            LSWR Sulfur             ------------------------------------
               Wt %       Minimum   To Waiau/Iwilei              To Kahe
            -----------   -------   ---------------              -------
            <S>           <C>       <C>                          <C> 
               [---]       [---]         [---]                    [---]
</TABLE> 
      (b) The specific quality and quantity of the LSWR in HECO's tankage
          before adjustment shall be determined in accordance with Sections 7.2,
          7.3 and 7.4, except that the samples shall be taken and gauging shall
          be done on HECO tanks at BPTF prior to Chevron's adjustment of
          quality.

      (c) The specific quality and quantity of the LSWR in HECO's tankage
          after adjustment shall be determined in accordance with Sections 7.2,
          7.3 and 7.4, except that the samples shall be taken and gauging shall
          be done on HECO tanks at BPTF after Chevron has completed the
          adjustment of quality.

Section 3:  Compensation

      (a) HECO shall purchase from Chevron whatever blend stock that is required
          for Chevron to complete the adjustment. The price of the oil used for
          adjustment shall be the [---]; otherwise, [---].

      (b) HECO shall [---] and each[---], provided however that [---].

                                       33
<PAGE>
 
Section 4:  Invoices

Invoices for the above will be submitted by Chevron and paid by HECO in
accordance with Article l0 of this Contract.

Section 5:  Illustrative Schedule of Prices and Fees

           (a)   Price of Blend Stock, [---].

               Basis:  1)  [---] = [---]

                       2)  [---] = [---]

                       3)  TF = Taxes currently in effect is the Hawaii General 
                                Excise Tax of 4.166% of pre-tax
                                price, [---], Hawaii Environmental Response
                                Tax of $0.05 per barrel, applied after the
                                HGET and [---].
 
               PRICE OF BLEND STOCK     = [---]
 
                                        = [---]
 
                                        = [---]
 
      where T = sum of
 
      HGET = 4.166% of [---] = 0.04166*[---]             =  [---] 
      [---]                                              =  [---]
      Hawaii Environmental Response Tax                  =  $0.0500/bbl
                                                            -----------
                 [---]                                      [---]
 
           (b)   [---]
 
                 Basis:   1)   HECO provides 250,000 barrels of LSWR

                          2)   Chevron provides 25,000 barrels of Blend Stock

                          3)   [---]

                          4)   Tax currently in effect is the Hawaii General
                               Excise Tax of 4.166% of pre-tax price.

                 [---]         = [---]

                               = [---]

                                       34
<PAGE>
 
                               = [---]
          where T = sum of
          HGET = 4.166% of Pre-HGET[---] = 0.04166*[---]           =   [---]
 
                           [---]

                                       35
<PAGE>
 
                                 ADDENDUM NO. 3
RECOVERY OF WORLDSCALE FIXED DIFFERENTIAL FOR OIL POLLUTION LIABILITY INSURANCE

The price formula for LSFO in Section 5.1 of the Contract includes the component
"FREIGHT" that refers to a Worldscale 100 rate published in the current edition
of Worldscale which incorporates a Fixed Rate Differential to reflect the cost
of additional premiums for Oil Spill Liability Insurance on vessels carrying
Persistent Oils applicable to voyages having a destination in the U.S.A..
Chevron acknowledges that any vessel used to transport LSFO that is sold and
purchased under the Contract, including its components and the crude oil from
which the LSFO is derived, shall be required to possess oil spill liability
insurance coverage in the amount of $700 million.

The price formula component "FREIGHT" refers to an AFRA rate applicable to a
vessel size classification of LR-1, or Large Range 1.  This vessel
classification references tanker vessels ranging in size from 45,000 Long Tons
Deadweight to 79,999 Long tons Deadweight.  In order to derive an approximation
of the relationship between Deadweight and Gross Registered Tons for a nominal
vessel consistent with the mathematical average of this vessel size
classification, the average of two vessels that have transported LSFO or its
components to Hawaii in the recent past that are approximately equal to the
midpoint of the LR-1 range were referenced.  These vessels are described as
follows:
 
        Name            Deadweight Tons (DWT)   Gross Registered Tons (GRT)
        ----            ---------------------   ---------------------------

   M/T London Spirit            62,097                    36,865
   M/T London Victory           62,156                    36,865
                                ------                    ------
 
        Average                 62,127                    36,865

The Worldscale 100 rate that is to be included in the computation of FREIGHT is
to be derived in the same manner as the following illustrative example
calculations:

1.     The Worldscale 100 rate in effect from February 20, 1997, shall include a
       Fixed Rate Differential for SBT Tankers which shall be the sum of a. and
       b. and shall be computed as follows:

       a. Fixed Rate Differential with respect to the additional
          insurance premiums For Basic $500 million coverage of Oil Pollution
          Liability Insurance on vessels carrying Persistent Oils to and from
          the U.S.A.

          Fixed Rate Differential =       $0.16/GRT X 36,865 GRT
                                          ----------------------
                                                  62,127

                                  =       $0.095 per Metric Ton

          For illustrative purposes, this rate may be expressed in
          U.S. dollars per barrel as follows:

                                  =       $0.095/Metric Ton
                                          -----------------
                                        6.75 barrels/Metric Ton

                                  =       $0.014/barrel

       b. Fixed Rate Differential with respect to the additional insurance
          premiums for Excess $200 million coverage of Oil Pollution Liability
          Insurance on vessels carrying Persistent Oils to and from the U.S.A.

                                       36
<PAGE>
 
      Fixed Rate Differential   =   .875 X $0.1205/GRT X 36,865 GRT
                                    -------------------------------
                                                62,127

                                =   $0.063 per Metric Ton

      For illustrative purposes, this rate may be expressed in U.S. dollars per
      barrel as follows:

                                =    $0.063/Metric Ton
                                     -----------------
                                   6.75 barrels/Metric Ton

                                =    $0.009/barrel

The sum of which shall equal $0.158 per Metric Ton, or $0.023 expressed in U.S.
dollars per barrel.

2.     The AFRA Worldscale Points and their related Worldscale 100 rate
applicable for each calendar quarter are based upon an average of the three
Monthly AFRA publications in the calendar quarter immediately preceding the
calendar quarter of the Nominated Month of Delivery. Therefore the relevant
Fixed Rate Differentials computed above should be applied (to a Year of 365
Days) as follows:

       A.  With respect to volumes of LSFO Nominated during the three (3) Months
of the quarter following a change in the published rate (typically February of
each Year), the relevant Fixed Rate Differential to be included in the
computation of the price component "FREIGHT" shall be the sum of:
 
           50/90 multiplied by the Fixed Rate Differential computed prior to the
           rate change:

           and 40/90 multiplied by the Fixed Rate Differential computed using
           the revised rate:
 
       B.  With respect to volumes of LSFO Nominated for subsequent Months, and
           continuing for so long as the Fixed Rate Differentials as set forth
           in Worldscale Circular shall be applicable, the relevant Fixed Rate
           Differential to be included in the computation of the price component
           "FREIGHT" shall be as derived in part 1 above.

                                       37
<PAGE>
 
ADDENDUM NO. 4  LSFO CONTRACT
Page 1 of 3
TRANSITION FROM REFINERY TO HECO BPTF LSFO TITLE TRANSFER POINT A (diagram)
<PAGE>
 
ADDENDUM NO. 4  LSFO CONTRACT
Page 2 of 3
TRANSITION FROM REFINERY TO KAHE PIPELINE LSFO TITLE TRANSFER POINT B (diagram)
<PAGE>
 
ADDENDUM NO. 4  LSFO CONTRACT
Page 3 of 3
TRANSITION FROM REFINERY TO BLACK OIL PIPELINE LSFO TITLE TRANSFER POINTS
(diagram)

<PAGE>
 
                                                               HECO Exhibit 10.9
                                                               -----------------



        INTER-ISLAND INDUSTRIAL FUEL OIL AND DIESEL FUEL SUPPLY CONTRACT

                                 By and Between


                           CHEVRON PRODUCTS COMPANY,
                        A DIVISION OF CHEVRON U.S.A. INC

                                      and

                        HAWAIIAN ELECTRIC COMPANY, INC.;

                          MAUI ELECTRIC COMPANY, LTD.;

                        HAWAII ELECTRIC LIGHT CO., INC.;

                          HAWAIIAN TUG & BARGE CORP.;

                          and YOUNG BROTHERS, LIMITED.



                         * * * * * * * * * * * * * * *
<PAGE>
 
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
ARTICLE                                                            PAGE
- -------                                                            ----
<S>                   <C>                                          <C>
 
ARTICLE I:   Definitions                                             1
ARTICLE 2:   Term                                                    4
ARTICLE 3:   Quantity                                                4
      Section 3.1:    Minimum and Maximum Annual Quantities          4
      Section 3.2:    Forecast                                       5
      Section 3.3:    Ratability                                     6
      Section 3.4:    Effect of Purchase Power Agreements (PPA)      6
ARTICLE 4:   Quality                                                 7
      Section 4.1:    CIFO Specifications                            7
      Section 4.2:    Diesel Specifications                          7
      Section 4.3:    Jet Fuel Grade                                 7
      Section 4.4:    No Warranty of Merchantability or Fitness      8
ARTICLE 5:   Price, BTU Determination                                8
      Section 5.1:    Diesel, CIFO and Jet Prices                    8
      Section 5.2:    Determination of Source of Raw Materials       8
      Section 5.3:    Reimbursement of All Taxes, Assessments and
                      Levies                                        10
      Section 5.4     Determination of BTU Content For Diesel       11
      Section 5.5:    Determination of BTU Content For CIFO         11
      Section 5.6:    Dispute                                       11
      Section 5.7:    Rounding of Prices                            11
      Section 5.8:    Successor Publications                        12
ARTICLE 6:   Deliveries                                             12
      Section 6.1:    Delivery of Diesel and CIFO to MECO 
                      and HELCO                                     12
      Section 6.2:    Delivery of Diesel to HT&B and YB             13
      Section 6.3:    Delivery of Diesel to HECO                    13
      Section 6.4:    Delivery of Jet to MECO and HELCO             13
      Section 6.5:    Chevron's Delivery of Diesel to Molokai,             
                      Kahului, Maui, Hilo, Hawaii and Kawaihae,
                      Hawaii                                        13
      Section 6.6:    Title and Risk of Loss                        13
      Section 6.7:    Notice of Delivery                            14
ARTICLE 7:   Determination Of Quality                               14
      Section 7.1:    Sampling Procedures                           14
      Section 7.2:    Quality Disputes                              15
      Section 7.3:    Impact of Less Than Quality Product           15
ARTICLE 8:   Measurement Of Quantity                                16
      Section 8.1:    Determination of Quantity                     16
      Section 8.2     Determination of Quantities at HDT            16
      Section 8.3     Quantity Dispute                              16
ARTICLE 9:   Invoicing and Payment                                  17
      Section 9.1:    Invoices                                      17
      Section 9.2:    Payment Terms                                 17
      Section 9.3:    Method of Payment                             17
ARTICLE 10:  Chevron's Facilities On Oahu                           18
ARTICLE 11:  Chevron's Facilities On Maui And Hawaii                19
      Section 11.1:   Use of Chevron Storage and Handling 
                      Facilities                                    19
      Section 11.2:   Barge Schedule Notification                   19
      Section 11.3    Loaded Samples                                20
      Section 11.4    Coast Guard Dock Watch Requirements           20
      Section 11.5:   Care, Custody and Control of Received Oil     20
</TABLE>

                                      ii
<PAGE>
 
<TABLE>
<S>                   <C>                                          <C>
      Section 11.6:   Determination of Quality of Received Oil 
                      at Unloading                                  21
      Section 11.7    Determination of Quantity of Received Oil 
                      and Oil at Time of Custody Transfer           21
      Section 11.8    Commingle Product                             22
      Section 11.9    Transfer Notification From Kahului and Hilo   22
      Section 11.10   Custody of Returned Fuel Oil                  22
      Section 11.11   Custody of Returned Diesel                    22
      Section 11.12   Return Oil Quantities                         23
      Section 11.13   Transfer of Returned Oil                      23
      Section 11.14   Terminaling and Handling Fees                 23
ARTICLE 12:  Contingencies                                          24
      Section 12.1:   Definition of Contingency                     24
      Section 12.2:   Obligation to Supply Product                  25
      Section 12.3:   Obligation to Purchase Product                25
      Section 12.4:   Price Determination Prevention                25
      Section 12.5:   Governmental Regulation Requirements          25
      Section 12.6:   Chevron's Obligations Under Contract          25
ARTICLE 13:  Effect Of Suspension Or Reduction                      26
      Section 13.1:   Event of Suspension                           26
      Section 13.2:   Suspension For More Than 180 Days             26
      Section 13.3:   Notification of Suspension                    26
      Section 13.4:   Obligation to Pay In Full                     26
      Section 13.5    Suspension Not A Breach Of Contract           26
ARTICLE 14   Waiver And Nonassignability                            26
      Section 14.1:   Waiver By One Party                           26
      Section 14.2:   Assignability of Contract                     27
ARTICLE 15   Conflict Of Interest                                   27
ARTICLE 16:  Default                                                27
ARTICLE 17:  Applicable Law                                         28
ARTICLE 18:  Indemnity                                              28
      Section 18.1:   Buyer Held Harmless for General Indemnity 
                      when title and risk of loss is with Chevron   28
      Section 18.2:   Buyer Held Harmless for Releases to the 
                      Environment when title and risk of loss is 
                      with Chevron                                  28
      Section 18.3    Chevron Held Harmless for General Indemnity 
                      when title and risk of loss is with Buyer     28
      Section 18.4:   Chevron Held Harmless for Releases to the 
                      Environment when title and risk of loss is 
                      with Buyer                                    29
ARTICLE 19:  Public Utilities Commission                            29
      Section 19.1:   Filing Requirements; Buyers Energy Cost 
                      Adjustment Clause                             29
      Section 19.2:   Decision and Order Impairing Chevron          29
      Section 19.3    Use as a Public Utility                       29
ARTICLE 20:  Insurance                                              30
      Section 20.1:   Requirements                                  30
      Section 20.2:   Change of Insurance Notification              30
      Section 20.3:   Certificate of Insurance From Subsequent 
                      Buyers and Carriers                           30
      Section 20.4:   Obtaining Insurance Documents                 31
      Section 20.5:   Terminaling and Handling Fees Insurance 
                      Exclusion                                     31
ARTICLE 21:  Safety And Terminal Protection                         31
      Section 21.1:   Operating and Safety Regulations              31
      Section 21.2:   Right To Refuse Acceptance                    31
ARTICLE 22:  Pollution Mitigation                                   31
      Section 22.1:   Responsibility To Mitigate                    31
      Section 22.2:   Cooperation With Chevron's Measures           32
</TABLE>

                                      iii
<PAGE>
 
<TABLE>
<S>                   <C>                                          <C>
ARTICLE 23:  Miscellaneous                                          32
      Section 23.1:   Heading of Articles and Sections              32
      Section 23.2:   Content of Document                           32
      Section 23.3:   Notification                                  32
      Section 23.4    Court Rulings                                 33
      Section 23.5:   Benefit of And Binding                        33
      Section 23.6:   Effective Date and Supersedence               33
ADDENDUM No. 1   Illustrative Schedule of Prices                    36
ADDENDUM No. 2   Quality Control Samples Summary and Schematic of 
                 Sample Locations                                   46
ADDENDUM No. 3   [---]                                              49
</TABLE>

                                      iv
<PAGE>
 
        INTER-ISLAND INDUSTRIAL FUEL OIL AND DIESEL FUEL SUPPLY CONTRACT
        ----------------------------------------------------------------

          THIS CONTRACT, dated as of Nov. 14, 1997, by and between CHEVRON
PRODUCTS COMPANY, A DIVISION OF CHEVRON U.S.A. INC a Pennsylvania corporation
("Chevron"), and HAWAIIAN ELECTRIC COMPANY, INC.; MAUI ELECTRIC COMPANY, LTD.;
HAWAII ELECTRIC LIGHT CO., INC.; HAWAIIAN TUG & BARGE CORP.; and YOUNG BROTHERS,
LIMITED, each a Hawaii corporation (collectively referred to as "Buyers" and
individually referred to as "Buyer" herein unless otherwise indicated).

          WHEREAS, Chevron is a supplier of petroleum fuels with terminal and
Refinery facilities in Hawaii.

          WHEREAS, Buyers are engaged in various business activities:  HECO,
HELCO, and MECO are utilities engaged in the generation, purchase and sale of
electricity in Hawaii; HT&B is a tug and barge company; YB is a barge company
engaged in general marine transportation.

          NOW, therefore, the parties agree as follows:


                                   ARTICLE I
                                  DEFINITIONS
                                  -----------
Except where otherwise indicated, the following definitions shall apply
throughout this Contract:

       1.   "API" or "API Gravity" means the American Petroleum Institutes
            standard measurement of gravity for petroleum products.

       2.   "ASTM" means the American Society for Testing and Materials whose
            standards are utilized in this Contract with respect to fuel
            specifications, quantitative measurements, sampling and testing.

       3.   "Affiliate", except where otherwise expressly provided, means a
            corporation controlling, controlled by or under common control with
            Chevron or Buyer, as the case may be.

       4.   [---]

       5.   "barrel" means 42 American bulk gallons at 60 degrees Fahrenheit

       6.   "Black Oil Pipeline" means Chevron's 8 inch black oil distribution
            pipeline between Chevron's Refinery and HMT with interconnections to
            HECO's Waiau electric generating station and HECO's Iwilei petroleum
            storage facility.

       7.   "BPH" means barrels per hour, a unit of measure of the rate of the
            physical transfer or movement of petroleum products.

       8.   "BTU" and "BTU content" means British Thermal Unit and refers to the
            standard assessment of a fuel's gross heating value or gross heat
            content.

       9.   "Buyer's Barbers Point Storage Facilities" means Buyer's bulk
            petroleum receiving, storage and distribution facilities located in
            the Barbers Point area of Oahu, located in Campbell Estate
            Industrial Park, Kapolei, Hawaii.

                                       1
<PAGE>
 
      10.    [---] means [---]

      11.    [---] means [---]

      12.    "Carrier" means Buyer's Nominated Barge or designated trucking
             company.

      13.    "Certificate of Quality" means the means the formal document
             recording the Chevron laboratory determinations of the quality and
             BTU content of a particular sample which represents a specific
             Delivery, said laboratory determinations having been performed in
             accordance with the standard test methods described in Article 4.

      14.    "Certificate of Quantity" means the document issued by the
             Independent Inspector verifying the measurements and quantities of
             oil delivered to Buyer as determined under Article VIII.

      15.    [---] means [---]

      16.    "Chevron's Terminal" means Chevron's bulk petroleum receiving,
             storage and distribution facility used to Deliver Oil to a
             respective Buyer's Nominated Barge.

      17.    "CIFO" means Chevron Industrial Fuel Oil No. 6 as per Section 4.1.

      18.    "Contingency" means an act or event specified in Section 12.1

      19.    "Contract" means this Inter-Island Industrial Fuel Oil and Diesel
             Fuel Supply Contract, between Chevron and HECO, MECO,HELCO, HTB &
             YB, the term of which commences January 1, 1998.

      20.    "Day" or "Days" means a calendar day of 24 hours

      21.    "Deliver, Delivery, Deliveries, or Delivered" refers to the Oil or
             Jet sold by Chevron and purchased by Buyer.

      22.    "Diesel" means Chevron Diesel Fuel No. 2 per Section 4.2.

      23.    "diesel" means either Chevron Diesel Fuel No. 2 or a third party
             diesel fuel similar to Chevron Diesel Fuel No. 2.

      24.    "Effective Date" means, for the purposes of this Contract, 
             January 1, 1998

      25.    "Extension" means successive 12-Month periods in the term of this
             Contract in addition to and after the initial term of this Contract
             which is through December 31, 2004, each Extension beginning
             January 1.

      26.    "Fuel Oil" means either Chevron Industrial Fuel Oil No. 6 or third
             party industrial fuel oil similar to Chevron Industrial Fuel Oil
             No. 6.

      27.    "G.S.V." means gross standard volume in U.S. barrels or in U.S.
             gallons at 60 degrees Fahrenheit.

      28.    "gallon" means a United States gallon of 231 cubic inches at 60
             degrees Fahrenheit

                                       2
<PAGE>
 
      29.    "HDT" means Chevron's Honolulu Distribution Terminal at Honolulu
             Harbor Pier 35.
 
      30.    "HMT" means Chevron's Honolulu Marine Terminal at Honolulu Harbor
             Piers 30 and 31.

      31.    "HT&B" means Hawaiian Tug & Barge Corp., which operates a tug and
             barge fleet.

      32.    "HECO" means Hawaiian Electric Company, Inc., which has electrical
             generating facilities on the island of Oahu.

      33.    "HELCO" means Hawaii Electric Light Co., Inc., which has electrical
             generating facilities on the island of Hawaii.

      34.    "Independent Inspector" means a qualified third-party petroleum
             inspection contractor acceptable to both Chevron and Buyer 
             providing petroleum sampling, measurement and oversight over 
             Delivery operations.

      35.    [---]

      36.    "Jet" means Chevron Jet Fuel per Section 4.3.

      37.    "jet" means either Chevron Jet Fuel or a third party jet fuel
             similar to Chevron Jet Fuel.

      38.    "Kaunakakai Terminal" means a third party Marine Terminal at
             Kaunakakai Harbor, Molokai.
  
      39.    "Loaded", when used in conjunction with Oil or Jet, refers to
             Buyer's Delivered Oil or Jet mixed with any cargo retains within
             Buyer's Nominated Barge.

      40.    "loaded", when used in conjunction with Oil or Jet, refers to
             Buyer's Delivered Oil or Jet or a third party's delivered oil or 
             jet mixed with any cargo retains within Buyer's Nominated Barge.

      41.    "MECO" means Maui Electric Company, Ltd., which has electrical
             generating facilities on the islands of Maui, Lanai and Molokai. 
             For the purposes of this Contract "MECO" refers to the operations 
             on the island of Maui only.

      42.    "MECO-Molokai" means the Molokai Division of Maui Electric Company,
             Ltd., which has electrical generation facilities on the island of
             Molokai.

      43.    "Month" means a calendar month.

      44.    "Nominated Barge" means a petroleum tank barge or vessel designated
             by Buyer to receive Oil Delivered by Chevron when the defined term
             is used in conjunction with Buyer, as in "Buyer's Nominated Barge";
             and means a petroleum tank barge or vessel designated by Chevron to
             Deliver Diesel when the defined term is used in conjunction with
             Chevron, as in "Chevron's Nominated Barge."

      45.    "Nominated Terminal" means a bulk petroleum receiving, storage and
             distribution facility designated by a respective Buyer to receive
             Diesel Delivered by Chevron at Kahului, Maui, Hilo, Hawaii or
             Kawaihae, Hawaii, when used in conjunction with "Buyer's" as in
             "Buyer's Nominated Terminal."

                                       3
<PAGE>
 
       46.   "Nominated Vessel" means a petroleum tank vessel designated by
             Buyer to deliver or receive Buyer's Petroleum Products when he
             defined term is used in conjunction with Buyer, as in "Buyer's
             Nominated Vessel."

       47.   "Oahu P/L" means Chevron's 8 inch white oil distribution pipeline
             between Chevron's Refinery and HMT with an interconnection to 
             HECO's Waiau electric generating station.

       48.   "Oil" means either Chevron Industrial Fuel Oil No. 6 or Chevron
             Diesel Fuel No. 2.

       49.   "oil" means Chevron Industrial Fuel Oil No. 6, Chevron Diesel Fuel
             No. 2, a third party industrial fuel oil similar to Chevron
             Industrial Fuel Oil No. 6, or a third party diesel fuel similar to
             Chevron Diesel Fuel Oil No. 2.

       50.   "Received", when used in conjunction with Oil or Jet, refers to 
             Buyer's Oil or Jet to be received by Chevron into its terminals on
             Maui and Hawaii. "Received", when used in conjunction with oil,
             means a third party industrial fuel oil similar to Chevron
             Industrial Fuel Oil No. 6 or a third party diesel fuel similar to
             Chevron Diesel Fuel Oil No. 2 received by Chevron into its
             terminals on Maui and Hawaii from Buyer's Nominated Barge.

       51.   "Returned", when used in conjunction with Oil, oil or Jet, refers 
             to the Oil, oil or Jet returned by Chevron from its terminals on
             Maui and Hawaii to Buyer for Buyer's use in Buyer's electrical
             generating facilities.

       52.   "Refinery" means Chevron's oil refining and related facilities
             located in the Barbers Point area of Oahu, in Campbell Estate
             Industrial Park, Kapolei Hawaii.

       53.   "YB" means Young Brothers, Limited, which operates a general marine
             transportation business.

       54.   "Year" means a calendar year.


                                   ARTICLE II
                                      TERM
                                      ----

The term of this Contract shall be from January 1, 1998 through December 31,
2004, and shall continue thereafter for Extensions beginning each successive
January 1, unless Buyer or Chevron gives written notice of termination at least
120 Days before the beginning of an Extension.


                                  ARTICLE III
                                    QUANTITY
                                    --------

Section 3.1:  Minimum And Maximum Annual Quantities

During each Year this Contract is in effect, Chevron shall sell and Deliver to
Buyer, and Buyer shall purchase and receive from Chevron no less than the
minimum nor more than the maximum annual quantity, except as otherwise expressly
provided herein, of CIFO, Diesel and Jet as set out below for each Buyer and
described in Article IV, from the HMT, the HDT, the Oahu P/L, Chevron-Nominated
Barge at Kahului, Maui, Chevron-Nominated Barge at Hilo, Hawaii, Chevron-
Nominated Barge at Kawaihae, Hawaii or a Chevron-Nominated Barge at the
Kaunakakai Terminal, as described in Article VI.  The purchase of CIFO and
Diesel shall be at a reasonably uniform rate.  Chevron shall sell and Deliver to
Buyer and Buyer shall purchase and receive from Chevron CIFO and Diesel [---]

                                       4
<PAGE>
 
<TABLE>
<CAPTION>
             All quantities shall be stated 
               in annual physical barrels.

I.   DIESEL
<S>  <C>            <C>       <C>
          1998      MINIMUM   MAXIMUM
          ----      -------   -------
     HECO           [---]     [---]
     HELCO          [---]     [---]
     MECO           [---]     [---]
     MECO-Molokai   [---]     [---]
     HT&B and YB    [---]     [---]
     TOTAL          [---]     [---]
     
       1999-2004
       ---------
     HECO           [---]     [---]
     HELCO          [---]     [---]
     MECO           [---]     [---]
     MECO-Molokai   [---]     [---]
     HT&B and YB    [---]     [---]
     TOTAL          [---]     [---]
     
     
II.  CIFO
        1998-       MINIMUM   MAXIMUM
        -----       -------   -------
     HELCO          [---]     [---]
     MECO           [---]     [---]
     TOTAL          [---]     [---]
     
     1999-2004
     ---------  
     HELCO          [---]     [---]
     MECO           [---]     [---]
     TOTAL          [---]     [---]
     
III. JET
     1998-2004      MINIMUM   MAXIMUM
     -----------    -------   -------
     HELCO                0   [---]
     MECO                 0   [---]
     TOTAL                0   [---]
</TABLE>

Upon prior written notice to Chevron, the respective Buyers may modify their
individual minimum and maximum annual physical quantities of Fuel Oil and Diesel
provided that the total annual minimum and maximum annual physical quantities of
CIFO, Diesel and Jet which shall be sold and Delivered by Chevron and purchased
and received by Buyers collectively, shall fall within the limits specified in
this Section 3.1

The minimum and maximum annual volumes of CIFO, Diesel and Jet to be sold and
Delivered by Chevron and purchased and received by Buyer shown above for Year
2004 shall also apply to any Extensions, unless mutually agreed otherwise .
Subject to availability, Chevron will sell and Deliver and Buyer shall purchase
and receive such additional volumes as are mutually agreed.

Section 3.2:  Forecast

Prior to the [---] Day of each Month, Buyer shall give Chevron a forecast of
each respective Buyer's Monthly lifting of Diesel, CIFO and Jet for each of the
coming three Months.  In addition and also prior to the [---]  Day of each
Month, Buyer shall provide Chevron a schedule of Buyer's Nominated Barge
loadings for the following Month. Such schedule shall show the expected place,
date and time of the commencement of the vessel's loading.

                                       5
<PAGE>
 
Each Buyer should update seller of any changes as they might occur. Buyer
recognizes the importance to Chevron of reasonably accurate lifting forecasts
because of Chevron's need to plan production and shipments.

Section 3.3:  Ratability

Buyers' purchases and Chevron's Deliveries of CIFO and Diesel will occur in a
reasonably ratable fashion throughout the Year.

At the end of each Year, Buyers' CIFO and Diesel purchase performance will each
be reviewed by Chevron for ratability.
 
     i.   If upon review Buyers' volumes in any calendar quarter were [---] of 
          the total minimum annual liftings for either CIFO or Diesel, [---]

     ii.  If upon review Buyers' volumes in any calendar quarter were [---] of 
          the total maximum annual liftings for either CIFO or Diesel, [---]

     iii. Chevron understands Buyers' Jet purchases will occur in a 
          non-ratable fashion and no ratability premiums will be applied to 
          Jet purchases

Section 3.4:  Effect of Purchase Power Agreements (PPA)

If due to the commencement of commercial operation of a generating plant or
generating plants supplying power to HELCO or MECO, or an increase in firm
capacity output under contracts existing as of the Effective Date, in aggregate
under one or more Purchase Power Agreements ("PPA") firm capacity in excess of
twenty (20) megawatts (gross basis), HELCO's or MECO's anticipated demands for
CIFO or Diesel results in Buyers' aggregate anticipated demand from Chevron on
an annual basis during any Year during the term of this Contract for CIFO or
Diesel to decline below the Buyers' aggregate minimum annual quantities set
forth in Section 3.1 (the difference between Buyers' aggregate anticipated
demand from Chevron and Buyers' aggregate minimum annual quantities being the
"Fuel Requirement Reduction"), then Buyers shall give written notice to Chevron
of Buyers' request that Chevron accept the Fuel Requirement Reduction.  Chevron
shall have fifteen (15) Days within which to accept Buyers' Fuel Requirement
Reduction or reject Buyers' Fuel Requirement Reduction and request a
renegotiation of HELCO's or MECO's, whichever is the affected Buyer, minimum
annual quantities of CIFO or Diesel in Section 3.1 and/or the price of HELCO's
or MECO's, whichever is the affected Buyer, CIFO or Diesel in Section 5.1 of
this Contract.

If Chevron either accepts Buyers' Fuel Requirement Reduction or fails to give
any notice of acceptance or rejection within said fifteen (15) Day period, then
Buyers' Fuel Requirement Reduction shall be deemed to have been accepted by
Chevron and shall become effective upon the expiration of said fifteen (15) Day
period.  Should Chevron reject Buyers' request for the Fuel Requirement
Reduction then, within sixty (60) Days following the date of any such rejection
notice, if the parties are unable to renegotiate HELCO's or MECO's, whichever is
the affected Buyer, minimum annual quantities and/or the price for HELCO's or
MECO's, whichever is the affected Buyer, CIFO or Diesel, in a manner mutually
satisfactory to both Chevron and the affected Buyer, then Chevron, upon thirty
(30) Days written notice, may elect to terminate its obligation to sell CIFO or
Diesel to the affected Buyer  under this Contract.  Until Buyers' request for a
Fuel Reduction Requirement (i) is accepted or deemed accepted by Chevron, (ii) a
mutually satisfactory provision for the affected Buyer's minimum annual
quantities and/or the affected Buyer's price for CIFO or Diesel, is
renegotiated, or (iii) the obligation to sell CIFO or Diesel to HELCO or MECO,
whichever is the affected Buyer, under this Contract is terminated in accordance
with this Section 3.4, the terms and conditions of this Contract shall be and
remain in full force and effect.

                                       6
<PAGE>
 
Notwithstanding any item to the contrary herein, any reduction in Buyers'
aggregated demand suppliers as a result of PPA's, shall be ratably allocated
among all Buyers' suppliers and/or sellers on basis of actual sales from each
supplier and/or seller over the immediately preceeding Year . Any reduction in
Chevron's minimum annual quantities as a result of PPA's shall also identically
reduce [---]

                                   ARTICLE IV
                                    QUALITY
                                    -------

Section 4.1:  CIFO Specifications

The CIFO to be supplied hereunder shall be Chevron's regular commercial grade of
Chevron Industrial Fuel Oil No. 6, having the following specifications:

<TABLE>
<CAPTION>
                                                             ASTM
Item                             Specifications          Test Method
- ----------------------------   ------------------   ---------------------
<S>                            <C>                  <C>
Gravity @ 60 degrees F, API    6.5 min.             D1298 or D4052-86
Flash, degrees F               150 min.             D93
Viscosity, SSF @ 122 degrees F 179 min., 226 max.   D445/D2161
Pour Point, degrees F          55 max.              D97
Sulfur, % Wt.                  2.00 max.            D1552, D2622 or D4294
Sediment & Water, % Vol.       0.5 max.             D1796
BTU content *, MM BTU/BBL      6.0                  D240
Vanadium **, PPM wt.           100                  D5863
Nitrogen ***, PPM wt.          6500                 D5762 or D4629
</TABLE>

* Typical Value is 6.3 MM BTU/bbl, value is typical; it is not guaranteed.
** Typical Value is shown, value is not a specification limit.
*** Typical Value is shown, value is not a specification limit.

Section 4.2:  Diesel Specifications

The Diesel to be supplied hereunder shall be similar to Chevron's regular
commercial grade of Chevron Diesel Fuel No. 2 and have the following
specifications:

<TABLE>
<CAPTION>
                                                 Specification             Test
Item                              Units             Limits                Method
- ---------------------------   -------------   -------------------   ------------------
<S>                           <C>             <C>                   <C>
Gravity @ 60 degrees F        degrees API,    30.0 min., .88 max.   D1298 or D4052-86                   
                              Specific                                                                  
Viscosity @ 100 DF            SSU             32.3 - 40.0           D445, D2161                         
BTU content *                 MM BTU/BBL      5.84                  Calculated or D240                  
Heat Value, Net               MM BTU/BBL      Report                Calculated or D240                  
Flash Point, PM               degrees F       150 min.              D93                                 
Pour Point *                  degrees F       35                    D97                                 
Ash                           PPM, wt.        100 max.              D482                                
Cetane Index                                  40 min.               D4737                               
Carbon Residue,
  10% Residuum                %, wt.          0.35 max.             D524
Sediment & Water              %, vol.         0.05 max.             D1796
Sulfur                        %, wt.          0.40 max.             D1552, D2622 or
                                                                    D4294
Distillation                                  
  90% Recovered               degrees F       540 - 650             D86
Sodium+Potassium              PPM, wt.        0.5 max.              D3605
Solium+Potassium+Lithium      PPM, wt.        Report                D3605
Vanadium **                   PPM, wt.        0.8                   D3605
</TABLE>

                                       7
<PAGE>
 
<TABLE>
<S>                           <C>             <C>                   <C>
Nitrogen ***                  PPM, wt.        120                   D4629 or D5762
</TABLE>

* Chevron does not provide specifications on these items.  Values are typical;
  they are not guaranteed.
** Typical value is shown, value is not a specification limit.
*** Typical value is shown, value is not a specification limit.

Section 4.3:  Jet Fuel Grade

The Jet to be supplied hereunder shall be similar to Chevron's regular
commercial grade of Chevron Jet Fuel; provided, however, Buyer agrees that the
Jet shall be used exclusively as stationary combustion turbine start-up fuel.
Any other use, including without limitation its use for aviation purposes, shall
constitute foreseeable misuse.

Section 4.4:  No Warranty of Merchantability or Fitness

CHEVRON MAKES NO WARRANTY, EXPRESSED OR IMPLIED IN FACT OR BY LAW, AS TO
MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE concerning the Oil and Jet
other than it shall comply with the quality herein specified, that the Diesel
shall be suitable for use as a fuel, the CIFO shall be suitable for use as a
boiler fuel, and the Jet shall be suitable for use as stationary combustion
turbine start-up fuel.


                                   ARTICLE V
                           PRICE, BTU DETERMINATION
                           ------------------------
                                        
Section 5.1:  Diesel, CIFO and Jet Prices

I.  NO. 2 DIESEL FUEL

          a.       For HECO, HT&B, YB; and MECO or HELCO FOB point of Delivery
                   as per Section 6.3, Section 6.2 and Section 6.1, 
                   respectively:
                   [---]
          b.       For MECO-Molokai/Delivered Kaunakakai:
                   [---]

          c.       For MECO-Maui/Delivered Kahului:
                   [---]
 
          d.       For HELCO-Hawaii/Delivered Hilo:
                   [---]

          e.       For HELCO-Hawaii/Delivered Kawaihae:
                   [---]
          where:
          PD1  =  Price per physical gallon for the Month of Delivery for No. 2
          Diesel Fuel purchased by HECO, HT&B, YB, MECO or HELCO in U.S. Dollars
          ("$") per ("/") gallon.
          PD2  =  Price per physical gallon for the Month of Delivery for No. 2
          Diesel purchased by MECO-Molokai, in $/gallon.
          PD3  =  Price per physical gallon for the Month of Delivery for No. 2
          Diesel purchased by MECO-Maui, Delivered to Kahului Maui, in $/gallon.
 

                                       8
<PAGE>
 
          PD4  =  Price per physical gallon for the Month of Delivery for No. 2 
          Diesel purchased by HELCO-Hawaii, Delivered to Hilo Hawaii, in 
          $/gallon.
          PD5  =  Price per physical gallon for the Month of Delivery for No. 2
          Diesel purchased by HELCO-Hawaii, Delivered to Kawaihae Hawaii, in
          $/gallon.
          DI  =  Index for No. 2 Diesel Fuel, which shall be the simple average
          of the high and low price assessments on all dates of publication for
          West Coast Pipeline, Los Angeles California Low Sulfur No. 2 Diesel as
          reported by Platt's Oilgram Price Report ("Platt's Oilgram") during 
          the period beginning  the 21st Day of the second preceding Month to 
          the 20th Day of the Month preceding Delivery, expressed in $/gallon.
          [---]

                [---]

                [---]

                [---]
          LP1, LP2, LP3, and LP4 are [---] for Deliveries in bulk to the
          respective Buyer at Kaunakakai, Molokai, Kahului, Maui, Hilo, Hawaii 
          or Kawaihae, Hawaii, during the period indicated and expressed in $ 
          per gallon, as follows:

<TABLE>
<CAPTION>
                                1988-1989   2000-2001   2002-2004
          <S>                   <C>         <C>         <C>
                 [---]          [---]       [---]       [---]
                 [---]          [---]       [---]       [---]
                 [---]          [---]       [---]       [---]
                 [---]          [---]       [---]       [---]
</TABLE>
 
          TD1/TD2/TD3/TD4/TD5 = Taxes applicable to the sale of Diesel pursuant 
          to Section 5.3 herein.
 
   II.  CIFO

               [---]
 
          where:
          PF = Price per physical barrel for the Month of Delivery for CIFO, 
          in $/barrel .
          FI = the Index for CIFO which shall be the simple average of the low
          and high price assessments for Los Angeles Bunker C Fuel Oil  as
          reported by Platt's Oilgram Bunkerwire ("Platt's Bunkerwire") for all
          dates of publication from the 21st Day of the second preceding Month 
          to 20th Day of the Month preceding Delivery expressed in $/barrel,
          converting to barrels from metric tons using a conversion factor of
          6.368 barrels/metric ton.
          [---]

          [---]

                                       9
<PAGE>
 
          [---]

          [---]
          TF = Taxes applicable to the sale of CIFO pursuant to Section 5.3
          herein.


 III.  JET.
               [---]

          where:
          PJ = price per physical barrel for the Month of Delivery for Jet, in 
               $/gallon.
          JI = Index for jet fuel which shall be the simple average of the
               Friday high and low price assessments of West Coast Spot 
               Pipeline price for jet fuel in Los Angeles as reported by 
               Platt's Oilgram from the 21st of the second preceding Month to
               the 20th Day of the Month preceding Delivery expressed in $ per
               gallon.

               If Platt's Oilgram is not published or does not publish a high 
               and low price for a particular Friday during the relevant
               period, the high and low prices for the closest preceding Day
               for which Platt's Oilgram publishes a price report will be used.

          TJ = Taxes applicable to the sale of Jet pursuant to Section 5.3
               herein.

Addendum No. 1 hereto contains an illustrative schedule of prices calculated
pursuant to this Section 5.1

Section 5.2:  Determination of Source of Raw Materials

To provide the flexibility needed by Chevron to meet its obligations to Buyer,
the source and type of crude oil and other raw material, the place of
manufacture, and the manufacturer of Oil and Jet for Delivery to Buyer hereunder
shall be determined solely by Chevron. The price of all Oil and Jet Delivered by
Chevron to Buyer hereunder shall be determined in accordance with the terms of
this Contract regardless of where, how and by whom such Oil and Jet is
manufactured and regardless of the type or source of crude oil or other raw
materials used in its manufacture.

Section 5.3:  Reimbursement of All Taxes, Assessments and Levies

In addition to all other amounts payable by Buyer under this Contract, Buyer
shall reimburse Chevron for all taxes, assessments, levies and imposts of
whatsoever kind or nature imposed on Chevron by any governmental or quasi-
governmental body as adjusted, modified or revised from time to time, including
without limitation the Hawaii General Excise Tax, [---] the Hawaii Environmental
Response Tax and Hawaii Liquid Fuel Tax, applicable to the sale of Diesel, with
respect to the execution or performance of this Contract or the receipt by
Chevron of payments hereunder. Notwithstanding the foregoing and any
illustrative schedule of prices herein, Buyer shall not be required to reimburse
Chevron for any tax measured by or based on the net income of Chevron.  To avoid
duplication of recovery, Buyer shall not be required to reimburse Chevron under
this Section 5.3 for any item expressly mentioned by Platt's Oilgram Price
Report or Platt's Bunkerwire, or confirmed by Platt's Oilgram Price Report or
Platt's Bunkerwire in writing upon inquiry by either Buyer or Chevron, as being
included in a price used to compute PD1, PD2, PD3, PD4, PD5, PD6, PF or PJ under
Section 5.1.

As of the Effective date of this Contract, the taxes and government fees which
are currently in effect include the Hawaii General Excise Tax (4.166%), [---],
the Hawaii Environmental Response Tax

                                       10
<PAGE>
 
($0.05 per barrel or $0.0012 per gallon) and the Hawaii Liquid Fuel Tax,
applicable to the sale of Diesel only, ($0.01 per gallon).  The Hawaii
Environmental Response Tax and Hawaii Liquid Fuel Tax are not subject to the
Hawaii General Excise Tax [---]

Section 5.4:  Determination of BTU Content For Diesel

Chevron will draw representative samples of all Diesel Delivered to each
respective Buyer as per Sections 6.1, 6.3. ii and 6.5 to determine the BTU
content per Section 7.1.  If the weighted average BTU content per gallon of the
representative samples of Diesel purchased by each respective Buyer during any
calendar quarter [---] the price charged for the Diesel sold and Delivered to
that respective Buyer during each Month of the calendar quarter in question
shall be adjusted by multiplying the Diesel price determined in Article V, by
the ratio of the actual heat content to a standard of [---]. If the weighted
average BTU content per gallon of the representative samples of Diesel purchased
by each respective Buyer during any calendar quarter [---], the price charged
for the Diesel sold and Delivered to that respective Buyer during each Month of
the calendar quarter in question shall be adjusted by multiplying the Diesel
price determined in Article V, by the ratio of the actual heat content [---].
Chevron shall credit Buyer's account for overpayments and Buyer shall pay
Chevron for underpayments resulting from the BTU adjustments as soon as
reasonably possible after the close of the Month following the end of a calendar
quarter.  Such adjustments to either Buyer or Chevron will be handled as
separate credits or invoices and each individual invoice drawn during the
calendar quarter will not be corrected and reissued.

Section 5.5:  Determination of BTU Content for CIFO

Chevron will draw representative samples of each CIFO Delivery to each
respective Buyer as per Section 6.1, to determine the CIFO BTU content per
Section 7.1.  If the weighted average BTU content of the CIFO sold and Delivered
to Buyer during any calendar quarter falls within the range  [---] physical
barrel, no price adjustment will be made.  If the CIFO BTU content per physical
barrel [---] per physical barrel, the price charged  for the  CIFO sold and
Delivered to that respective Buyer during each Month of the calendar quarter in
question shall be adjusted by multiplying the CIFO price as determined by
Section 5.1.ii.  by a ratio of actual average heat content to [---].  Chevron
shall credit Buyer's account for overpayments and Buyer shall pay Chevron for
underpayments resulting from the BTU adjustments as soon as reasonably possible
after the close of Month following the end of a calendar quarter.  Such
adjustments to either Buyer or Chevron  will be handled as separate credits or
invoices and each individual invoice drawn during the Month will not be
corrected and reissued.

Section 5.6:  Dispute

The official BTU content determination shall be based upon Chevron's laboratory
results provided that the arithmetic difference between Chevron's and Buyer's
laboratory results is equal to or less than the then existing ASTM
reproducibility standard (currently 0.4 MJ/kg, which shall be set equal to
60,000 BTU per barrel for CIFO and 1,200 BTU per gallon for Diesel for this
purpose) for test D-240.  If the difference between Chevron's and Buyer's
laboratory results should fall outside the ASTM reproducibility standard for
ASTM test D-240, at Chevron's or Buyer's option, the sealed sample in the
possession of the Independent Inspector shall be provided to an independent
laboratory for an official determination, which shall be binding upon the
parties.  Chevron and Buyer shall share equally the costs of independent tests
and determinations.

Section 5.7:  Rounding of Prices

All prices, adjustments thereto and other sums payable hereunder shall be stated
in the nearest thousandth of a dollar when related to the sale and purchase of
CIFO hereunder and all prices, adjustments thereto and other sums payable
hereunder shall be stated in the nearest ten thousandth of a dollar when related
to the sale and purchase of Diesel or Jet hereunder.

                                       11
<PAGE>
 
Section 5.8:  Successor Publications

Platt's Oilgram and Platt's Bunkerwire shall include any successor
publication(s) and, in the event of either the discontinuance of these
publications or the assessments of West Coast Pipeline, Los Angeles California
Low Sulfur No. 2 Diesel, West Coast Spot Pipeline, Los Angeles Jet or Los
Angeles Bunker C Fuel Oil, respectively, the parties shall agree upon an
alternate price reporting services and publications or market price assessments
and any modification of the per gallon or per barrel [---] for Diesel, Jet or
CIFO, as applicable, as may be reasonable under the circumstances.


                                   ARTICLE VI
                                   DELIVERIES
                                   ----------

Section 6.1:  Delivery of Diesel and CIFO to MECO and HELCO
 
     i.     Chevron agrees to Deliver and MECO and HELCO agree to receive their 
            Oil into Buyer's Nominated Barge, Free On Board ("F.O.B.") at HMT.
            The Delivery rate on Diesel shall be [---] minimum. The Delivery
            rate on CIFO at HMT shall be [---] minimum. Chevron agrees to make
            its best, reasonable efforts to load Diesel and CIFO concurrently,
            provided however that Buyer's Nominated Barge is capable of
            receiving same and to operate its current CIFO Delivery systems to
            Deliver CIFO into said Nominated Barge at a temperature [---] at
            HMT. Buyer acknowledges that the CIFO Delivery temperature is
            determined by Chevron's and HECO's scheduling of other fuels in
            Chevron's pipeline, and hence cannot be guaranteed.

     ii.    [---]Chevron agrees to make its best, reasonable efforts to load 
            Diesel and CIFO concurrently, provided however that Buyer's
            Nominated Barge is capable of receiving same and in operating its
            current CIFO Delivery systems to Deliver CIFO into said Nominated
            Barge at a temperature about [---]. Buyer acknowledges that the CIFO
            Delivery temperature is determined by Chevron's and HECO's
            scheduling of other fuels in Chevron's pipeline, and hence cannot be
            guaranteed.

     iii.   Chevron and Buyer's agent or an Independent Inspector shall inspect
            the receiving barge cargo tanks to ensure that they contain only
            minimal remains of the previous cargo, before Chevron will Deliver
            Oil to be terminaled per Article XI. The Independent Inspector and
            shall draw composite samples of any diesel and fuel oil remains
            ("Buyer's Remains Samples") if such remains ("Remains") are
            accessible to standard sampling equipment. The Remain Samples shall
            be sealed and retained by the Independent Inspector for a period of
            not less than three (3) Months. The quality and quantity of the
            Remains exceeding common commercial practice shall be removed by
            Buyer to protect the quality of the Delivered Oil. Buyer or Buyer's
            agent may remove the Remains by any legal method at their disposal,
            including pumping the Remains into Chevron's slop tank at the HMT,
            if convenient to Chevron. Chevron shall have the right to charge
            Buyer for accepting Remains if the quantity to be removed from any
            barge or the number of barges requiring Remains to be removed
            becomes excessive. Chevron shall have the right to flush the
            receiving barge cargo tanks with a small quantity of Chevron's Oil
            before loading the Delivered Oil.

     iv.    To provide an early warning of any quality problems with the Diesel 
            or CIFO, Chevron agrees to perform a preliminary analysis
            ("Preliminary Analysis") including API gravity, and flash point on a
            composite sample(s) from the relevant HMT or Refinery issuing
            tank(s) and pipeline fill, if any, so as to be approximately
            representative of the quality of the Diesel and CIFO intended to be
            sold and Delivered to Buyer. The Independent Inspector shall ensure
            that copies of the Preliminary Analysis and other relevant quality
            documentation are placed on Buyer's Nominated Barge prior to its
            departure to be made available to representatives of the terminal
            facility receiving the cargo onboard Buyer's Nominated Barge.

                                       12
<PAGE>
 
Section 6.2:  Delivery of Diesel to HT&B and YB

Chevron agrees to Deliver and HT&B and YB agree to receive their Diesel into
their nominated vessel F.O.B. the HMT, Pier 31 or 32.  The Delivery rate shall
be 175 BPH minimum.

[---]

Section 6.3:  Delivery of Diesel to HECO

Chevron agrees to Deliver and HECO agrees to receive its Diesel under either of
the options below.

     i.   Chevron will Deliver Diesel from the HDT into HECO's nominated tank 
          truck at a Delivery rate of [---] minimum.

     ii.  Chevron will Deliver Diesel from the Oahu P/L into HECO's storage at 
          HECO's Waiau Power Plant, at a Delivery rate of [---] minimum.

Section 6.4:  Delivery of Jet to MECO and HELCO

Chevron agrees to deliver and MECO and HELCO agree to receive Jet at MECO's or
HELCO's respective power plant truck unloading rack.

Section 6.5:  Chevron's Delivery of Diesel to Molokai, Kahului, Maui, Hilo,
Hawaii and Kawaihae, Hawaii

     i.   Chevron agrees to Deliver Diesel in Chevron Nominated Barges and 
          MECO-Molokai agrees to receive its Oil into its nominated marine 
          terminal at Kaunakakai Harbor, Molokai.  The Delivery rate shall be 
          [---] minimum.  Buyer will provide discharge facilities through an 
          independent third party; Chevron has no responsibility to procure 
          discharge facilities on the island of Molokai.

     ii.  On a space available basis and when the date is mutually agreed to, 
          Chevron may Deliver in Chevron's Nominated Barge and MECO and HELCO
          may receive into their nominated marine terminal at Kahului, Maui and
          Hilo and Kawaihae, Hawaii, respectively. The Delivery rate shall be 
          [---] minimum. The respective Buyer is responsible for providing 
          discharge facilities; Chevron has no responsibility to procure
          discharge facilities on the islands of Maui and Hawaii for the sole
          purpose of receiving Deliveries of Diesel in bulk from Chevron's
          Nominated Barge on behalf of Buyer.

Section 6.6:  Title and Risk of Loss
 
     i.   For the Delivered Oil under Sections 6.1 and 6.2, care, custody, 
          control, title and risk of loss shall pass to Buyer as the Oil passes
          the flange connecting Chevron's pipeline to the cargo hose of the
          Buyer's Nominated Barge or vessel.

     ii.  For the Delivered Diesel under Section 6.3.i., care, custody, 
          control, title and risk of loss shall pass to Buyer as the Oil passes
          the flange connecting the cargo hose at Chevrons' truck loading rack
          to the Buyer's nominated tank truck.

     iii. For the Delivered Diesel under Section 6.3.ii., care, custody, 
          control, title and risk of loss shall pass to Buyer as the Oil passes
          the flange connecting Buyer's pipeline at the Chevron Oahu P/L to the
          Waiau Power Plant.

     iv.  For the Delivered Diesel under Section 6.5.i and Section 6.5.ii, 
          care, custody, control, title and risk of loss shall pass to Buyer as
          the Oil passes the flange connecting the cargo hose of the

                                       13
<PAGE>
 
          Chevron's Nominated Barge or vessel to the Buyer's designated pipeline

     v.   For the delivered Jet under section 6.4, care, custody, control, 
          title and risk of loss shall pass to Buyer as the jet passes the
          flange connecting the cargo hose of the Chevron's tank truck and
          Buyer's truck unloading rack at HELCO's and MECO's respective power
          plant.

Section 6.7:  Notice of Delivery

The respective Buyer, or its agent, shall provide Chevron with advance notice of
Oil to be Delivered and received under Sections 6.1, 6.3ii, 6.4 and 6.5 in
accordance with Section 3.2 or [---],  and the respective Buyer shall provide
telephone notification for Diesel to be Delivered under Section 6.2 or 6.3.i.
Chevron shall make all reasonable effort to comply with this notice and advise
Buyer promptly if the Delivery time cannot be met.


                                  ARTICLE VII
                            DETERMINATION OF QUALITY
                            ------------------------

Section 7.1:  Sampling Procedures

The quality of the Oil purchased by HECO, having its origination at HDT, the
quality of Diesel purchased by HT&B and YB and the quality of Jet purchased by
HELCO and MECO shall be determined on the basis of  a volumetric weighted
average composite of samples drawn from the issuing tank(s) by Chevron in such a
manner as to be representative of each Delivery.  Such samples of Oil or Jet
shall be referred to as "Chevron's terminal samples" and shall be divided into a
minimum of two (2) parts one of which shall be sealed and dated and retained by
Chevron, or an Independent Inspector at the option of Chevron, for a period of
not less than three (3) Months.

The quality of Oil purchased by HECO and Delivered by Chevron from Chevron's
Oahu P/L into HECO's storage at HECO's Waiau Power Plant shall be determined on
the basis of a volumetric weighted average composite of samples drawn from
Chevron's issuing tank(s) in such a manner as to be representative of the
Delivery ("Chevron's piped sample").  In addition, a volumetric weighted average
composite of samples from HECO's receiving tank(s) at HECO's Waiau Power Plant
in such a manner as to be representative of the affected tank's contents
("Buyer's piped sample").  The Buyer's piped sample is to be divided into a
minimum of two (2) parts one of which shall be retained by the Independent
Inspector for a period of not less than three (3) Months.

The quality of the Oil purchased by MECO-Molokai, and MECO or HELCO if Delivery
is made pursuant to Section 6.5, shall be determined on the basis of a
volumetric weighted average composite of samples drawn by Chevron from tanks of
Chevron's Nominated Barge in such a manner as to be representative of the
Delivered Oil ("Chevron's barge sample," can also be considered "Chevron's
loaded sample" if the receiving tank is in Chevron's facilities on Maui or
Hawaii").  In addition, the Independent Inspector shall draw a volumetric
weighted average composite of samples from the receiving tank(s) at the
Kaunakakai Terminal, or Buyer's Nominated Terminal in Kahului, Maui, Hilo,
Hawaii and Kawaihae, Hawaii after the completion of each Delivery, in such a
manner as to be representative of the Diesel inventory ("Buyer's terminal
sample," can also be considered "Chevron's Received Sample" if the receiving
tank is in Chevron's facilities on Maui or Hawaii).  The Buyer's terminal sample
is to be divided into a minimum of two (2) parts one of which shall be retained
by the Independent Inspector for a period of not less than three (3) Months.

Unless otherwise specifically agreed by the parties, the quality and heat
content of the Oil Delivered by Chevron into Buyer's Nominated Barge at
Chevron's HMT [---] shall be determined on the basis of a volumetric weighted
average composite of samples ("Chevron's loaded sample") drawn by the
Independent Inspector from the cargo tanks of Buyer's Nominated Barge at the
completion of loading in such a manner as to be representative of the total
volume of the Delivery.  See Addendum No. 2 attached hereto for an overview of
Chevron sampling.

                                       14
<PAGE>
 
The Chevron's loaded sample, Chevron's piped sample, Chevron's barge sample and
any other sample not otherwise specifically provided shall be divided into three
(3) parts and dated, such parts to be distributed as follows:

     1.   One part shall be provided to Chevron's laboratory for analysis and 
          quality determination.

     2.   One part shall be provided to Buyer's laboratory for the purpose of 
          verifying Chevron's determinations.

     3.   One part shall be sealed and retained by the Independent Inspector 
          for a period of not less than three (3) Months.

The determination of the Oil or Jet's quality and BTU content shall be reported
through the preparation of a Certificate of Quality by Chevron's laboratory.
Chevron agrees to provide Buyer and the Independent Inspector copies of the
complete Certificate of Quality of the Oil or Jet; and will make best reasonable
efforts to provide the Certificate of Quality no later than two (2) working days
after the completion of the Delivery.  Buyer shall have the right to perform
laboratory analyses in order to verify the results of Chevron's quality and BTU
content determinations.

Section 7.2:  Quality Disputes

Within sixty (60) Days after the end of each Month, Buyer shall give Chevron
notice of any disagreement with Chevron's quality or BTU content determination
for Delivered Oil and Delivered Jet during such Month. Buyer shall present
Chevron with documents supporting such disagreement and the parties will confer,
in good faith, on the causes for the discrepancy and shall proceed to correct
such causes and adjust the quality, if justified, for the Delivery in question.
In the event that such disagreement is not resolved within thirty (30) Days of
the date of Buyer's notice, the Independent Inspector shall prepare, in whole or
in part from the samples in its possession, a representative sample of the
disputed Delivery ("Referee Sample") which shall be submitted to a mutually
agreed upon independent laboratory for a final determination, whose
determination shall be final and binding on both parties. The Referee Sample
shall include a volumetric weighted proportion of samples as are applicable to
the Oil or Jet in question, including Buyer's remain samples, or in lieu thereof
samples of the oil from the previous cargo, should the retains of the previous
cargo be reasonably suspected as a cause of the quality problem..

Section 7.3:  Impact of Less Than Quality Product

If Buyer and Chevron agree or the Independent Inspector or independent
laboratory determines that the quality of Delivered Oil and Delivered Jet did
not equal the qualities described in Article IV (regardless of whether or not
the Preliminary Analysis indicated a quality problem or whether such Oil and Jet
passed tests of conditional acceptance), the Buyer and Chevron shall attempt to
minimize the impact.  This may include specification waiver especially if use of
Oil and Jet will not harm Buyer or Chevron, or delivering higher quality Oil and
Jet in a timely manner to produce a specification quality blend in Chevron's
terminal or at Buyer's nominated vessel or terminal, wherever the Oil or Jet or
oil or jet in question then resides.  If all such, or similar efforts fail to
resolve the quality problem, then Chevron at Chevron's expense, shall exchange
the non-specification Oil and Jet and other oil downgraded by commingling with
Chevron's Oil and Jet, with Oil and Jet meeting the qualities of Article IV. All
costs and expenses, including testing, transportation, re-refining and handling
costs incurred in returning and replacing off-specification Oil and Jet shall be
paid by the responsible party as determined by the Independent Inspector,
independent laboratory and any other available relevant evidence.  However, in
no event shall Chevron be liable for any indirect, consequential, special or
incidental damages of any kind whether based in contract, tort (including
without limitation negligence or strict liability), warranty or otherwise
allegedly caused by or based upon the qualities of the Oil and Jet.

                                       15
<PAGE>
 
                                  ARTICLE VIII
                            MEASUREMENT OF QUANTITY
                            -----------------------
Section 8.1:  Determination of Quantity

     i.   Quantities of the Oil sold and Delivered by Chevron and purchased and 
          received by Buyers under this Contract at the HMT shall be determined
          at the time of each Delivery by gauging the HMT tanks before and after
          pumping under the supervision of the Independent Inspector.

     ii.  Quantities of Oil sold by Chevron and purchased and received by 
          Buyers under this Contract where Delivery of the Oil at the HMT pumped
          from the Refinery in direct continuation through Chevron's Oahu P/L or
          Chevron's Black Oil Pipeline, sold and purchased under this Contract
          and Delivered to Buyer at the Waiau Power Plant [---], shall be
          determined at the time of each Delivery by gauging Chevron's tanks at
          its Barbers Point Refinery before and after pumping under the
          supervision of the Independent Inspector.

     iii. Diesel sold by Chevron and purchased and received by Buyers under 
          this Contract at the Kaunakakai Terminal, or at Buyer's Nominated
          Terminal at Kahului, Maui, Hilo Hawaii or Kawaihae, Hawaii shall be
          determined at the time of each Delivery by gauging Buyer's tank(s) at
          the Kaunakakai terminal or Buyer's Nominated Terminal before and after
          pumping under the supervision of the Independent Inspector.

     iv.  Quantities Delivered hereunder shall be calculated in accordance with 
          current measurement standards adopted by industry, ASTM, API and other
          standard-setting bodies as applicable in the opinion of the
          Independent Inspector and shall be expressed in G.S.V., U.S. barrels
          or U.S. gallons @ 60 degrees F.

     v.   All such measurements shall be taken by a mutually agreed upon 
          Independent Inspector who shall (1) prepare and sign a certificate
          stating the quantity of Oil determined according to the provisions of
          this Section 8.1 to have been Delivered to Buyer ("Certificate of
          Quantity"); (2) furnish Chevron and Buyer each with a copy of such
          Certificate of Quantity; and (3) advise by facsimile or electronic
          mail the quantity Delivered to Buyer. The data in the Independent
          Inspector's report and Certificate of Quantity prepared as provided
          herein shall, absent fraud or error and omissions, be binding and
          conclusive upon both parties, and shall be used for verification of
          the invoice and Bill of Lading . Chevron and Buyer shall share equally
          the cost of independent inspections. Chevron reserves the right to
          install meters on the Oahu P/L and to determine quantity as in Section
          8.2.

Section 8.2:  Determination of Quantities at HDT

Diesel sold and purchased under this Contract at the HDT and Jet sold and
purchased by HELCO and MECO shall be determined at the time of each Delivery by
reading calibrated meters, corrected in each instance to volume at 60 degrees F 
in accordance with current measurement standards adopted by industry, ASTM, API
and other standard-setting bodies as applicable in the opinion of the
Independent Inspector. The meters used at the HDT and Chevron's terminals on
Hawaii and Maui shall be Chevron's meters. Both Buyer and Chevron shall have the
right to review each other's routine certification documents.

Section 8.3:  Quantity Dispute

If Buyer or Chevron has reason to believe that the quantity of Oil and Jet
stated for a particular Delivery per Sections 8.1 or 8.2 is incorrect, the party
shall within sixty (60) Days of the Delivery date, present the other party with
documentation supporting such determination and the parties will confer, in good
faith, on the causes for the discrepancy and shall proceed to correct such
causes and adjust the quantity, if justified, for the Deliveries in question.

                                       16
<PAGE>
 
                                   ARTICLE IX
                             INVOICING AND PAYMENT
                             ---------------------
Section 9.1:  Invoices

Invoices for the sale of CIFO, Diesel, and Jet, which will show the price per
physical barrel sold will be prepared and dated following Delivery, and for the
services provided by Chevron as outlined in Article XI, shall be rendered
promptly to Buyer.  Original invoices shall include documentation acceptable to
both parties, including Certificate of Quality, Certificate of Quantity or
report of the Independent Inspector and price calculation; such documentation
may, however, be provided to Buyer or its agent separately.

Section 9.2:  Payment Terms

Payments shall be made in U.S. dollars.  Subject to Section 8.3 herein, the
timing of payments of  invoices shall be as follows:

     i.   Invoices to HECO, MECO, MECO-Molokai and HELCO:

          a.   Payment for Deliveries and services from the first through the 
               tenth Day of a Month for which invoices have been received is 
               due on the twentieth Day of the Month.

          b.   Payment for Deliveries and services from the eleventh through the
               twentieth Day of a Month for which invoices have been received is
               due on the last Day of the Month.

          c.   Payment for Deliveries and services from the twenty-first 
               through the last Day of a Month for which invoices have been 
               received is due on the tenth Day of the following Month.

          Due dates are dates payments are to reach Chevron.  If the due date
          falls on a Saturday, the payment shall be due on the preceding 
          business day.  If such date falls on a Sunday or a holiday, payment 
          shall be due the following business day.

     ii.  Payment for Deliveries to HT&B and YB for which invoices have been
          received shall be paid within thirty (30) Days of the Delivery date.

     iii. If an invoice incorporating an item at variance with the documentation
          or is disputed has been sent to Buyer, then Buyer shall hold said
          invoice without penalty until such error, variance with documentation
          or dispute is resolved and Buyer shall have received a corrected
          invoice or debit or credit issued subsequently to the original
          invoice. Buyer shall make payment for such subsequent invoices or
          debits in accordance with Section 9.2.i or Section 9.2.ii, whichever
          is applicable. If a disputed item has not been resolved in 30 Days
          from date of invoice, Buyer shall pay the undisputed amount.

Section 9.3:  Method of Payment

Method of payment shall be as follows:

     i.   Payments of HECO, MECO, MECO-Molokai, and HELCO shall be by bank wire
               transfer of immediately available funds to:
               First National Bank of Chicago, Chicago, Illinois 60607
               Attention:  GFTS
          for credit to the following accounts, depending on which Buyer is
          making a payment:
          a.   HECO           Chevron Products Company,
                              a division of Chevron U.S.A. Inc
                              Section #632
                              Account No. 1184762

                                       17
<PAGE>
 
          b.   HELCO          Chevron Products Company,
                              a division of Chevron U.S.A. Inc
                              Section #632
                              Account No. 1237632

          c.   MECO           Chevron Products Company,
                              a division of Chevron U.S.A. Inc
                              Section #632
                              Account No. 1237636

          d.   MECO-Molokai   Chevron Products Company,
                              a division of Chevron U.S.A. Inc
                              Section #632
                              Account No. 6049549

     For identification purposes, all wires must clearly indicate that payment
     is being made by order of Buyer and indicate the invoice reference number.
     In addition, written documentation evidencing specific invoices being paid
     shall be immediately forwarded to:

                              Chevron Products Company,
                              a division of Chevron U.S.A. Inc
                              P.O. Box R
                              Concord, California 94524

     ii.  Payment by HT&B and YB shall be mailed to:
                              Chevron Products Company,
                              a division of Chevron U.S.A. Inc
                              c/o First Interstate Bank
                              Dept. 7351
                              Los Angeles, CA 90088

     Payment shall include written documentation evidencing specific invoices 
     being paid.


                                   ARTICLE X
                          CHEVRON'S FACILITIES ON OAHU
                          ----------------------------

     i.   Chevron agrees to provide the use of its Oahu P/L for the Diesel  
          Delivered to HECO's Waiau Power Plant per Section 6.3.ii.

     ii.  Chevron agrees to make available on a  [---] the use of [---], such 
          use shall include an [---], if and whenever said  [---] Contract and 
          Addendum No. 3 attached hereto and incorporated herein by reference.

                                       18
<PAGE>
 
                                   ARTICLE XI
                    CHEVRON'S FACILITIES ON MAUI AND HAWAII
                    ---------------------------------------
                                        
As used in this Article XI, "Buyer" will refer only to MECO or HELCO.

Section 11.1:  Use of Chevron Storage and Handling Facilities

     i.   Chevron agrees to provide MECO the use of its storage and handling 
          facilities for Diesel Received at Kahului, Maui, and to provide HELCO
          the use of its storage and handling facilities for Diesel and CIFO
          Received at Hilo, Hawaii; for the Delivered Oil under Article VI and
          the third party oil purchased as a result of the force majeure
          conditions of Article XIII, on the terms and conditions described in
          this Article XI. To provide operating flexibility to a valued, long-
          term customer, Chevron shall grant HELCO the non-exclusive right to
          terminal oil purchased from third parties at Chevron's facility at
          Hilo, Hawaii up to a maximum quantity per Year of [---] and [---],
          which meet the specifications set out herein. Buyer agrees to schedule
          its deliveries such that they contain a minimum of [---] barrels of
          oil such that they arrive at regular intervals. For the same reasons,
          Chevron shall grant MECO the non-exclusive right to terminal No. 2
          diesel fuel purchased from third parties at Chevron's facility on Maui
          up to a maximum quantity of [---] barrels per Year, which meets the
          specifications set out herein. Buyer agrees to schedule its deliveries
          such that they contain a minimum of [---] barrels of diesel fuel and
          that they arrive at regular intervals.

     ii.  Whenever Buyer purchases third party oil which is to be terminaled in 
          Chevron's facilities, Buyer shall obtain a sample representative of
          the oil in the barge cargo tanks, after the third party supplier has
          completed the loading of such oil into Buyer's Nominated Barge. Buyer
          shall provide a part of a volumetric weighted average composite sample
          representative of the oil in the barge cargo tanks upon completion of
          loading to the Independent Inspector who shall retain it for a period
          of not less than three (3) Months. This sample ("Buyer's loaded
          sample") shall be available for analysis by Chevron, Buyer or an
          independent laboratory should Chevron's subsequent sampling and
          analysis indicate a quality problem. This sample shall indicate the
          quality of this mixture of purchased oil and the previous cargo
          remains. To provide an early warning of any quality problems with the
          Received oil, Buyer agrees to instruct the Independent Inspector to
          provide Chevron a preliminary analysis of Buyer's loaded sample
          consisting of API gravity, appearance and, in the case of diesel fuel,
          flash point, at the time such third party oil is loaded for transport.
          Buyer also agrees to instruct the Independent Inspector to deliver one
          copy of such preliminary analysis promptly to Chevron's representative
          at the Honolulu Marine Terminal and to deliver a copy of the
          Preliminary Analysis and other relevant quality documentation in
          Buyer's or the Independent Inspector's possession to Buyer's Nominated
          Barge for delivery to Chevron's representative upon arrival at the
          appropriate outer island terminal. Buyer further agrees that the cost
          of any additives which may be required to eliminate compatibility
          problems between third party oil and Chevron's Oil at the outer island
          terminal shall be solely for Buyer's account.

Section 11.2:  Barge Schedule Notification

Buyer shall provide Chevron with estimated arrival times of the barge
transporting the oil for which Buyer desires to use Chevron's facilities on Maui
or Hawaii. Buyer or Buyer's agent shall provide radio, phone or facsimile
notification to Chevron's representative at each unloading location at least
seven Days prior to a third-party supplied oil delivery and at least 24 hours
prior to a Chevron supplied oil delivery. Buyer or Buyer's agent shall also
provide the Captain of the Port with radio or phone notification at least 24
hours prior to any delivery. Should the estimated time of arrival change by two
or more hours following the 24 hour arrival report, Buyer or Buyer's agent shall
promptly report the change to Chevron's representative and the Captain of the
Port at the place of planned arrival.

                                       19
<PAGE>
 
Section 11.3:  Loaded Samples

     i.   Chevron shall analyze Chevron's Loaded sample of Section 6.1.iv and
          review Buyer's supplied results from any Buyer's loaded sample of
          Section 11.1.ii for conditional acceptance for receiving the oil, and
          if warranted, analyze Chevron's Loaded sample of Section 6.1.iv and if
          a quality problem with the loaded oil is reasonably indicated, obtain
          and analyze a sufficient portion of Buyer's loaded sample of Section
          11.1.ii for all the qualities described in Article IV, while Buyer's
          Nominated Barge is enroute to Maui or Hawaii, to reduce the risk of
          contaminating Chevron's terminal inventories. See Addendum No. 2
          hereto for an overview of all Chevron sampling. If Buyer's supplied
          results from any Buyer's loaded sample fails conditional acceptance or
          Chevron's analysis of Buyer's loaded sample is not consistent with the
          qualities described in Article IV, Chevron shall promptly notify Buyer
          of any quality problems with the loaded oil. Both Buyer and Chevron
          shall attempt to minimize the impact of any quality problem by
          specification waiver especially if use of the loaded oil will not harm
          either Buyer or Chevron, or by Buyer or Chevron Delivering higher
          quality oil in a timely manner to produce a specification quality
          blend at Chevron's terminal. If all such, and similar, efforts fail to
          resolve the quality problem, then Buyer's loaded oil shall not be
          unloaded into Chevron's terminal tanks. Buyer may return non-
          specification Loaded Oil to Chevron's Barbers Point Refinery, in which
          case Chevron shall replace the non-specification Loaded Oil by
          Delivering an equal volume of Oil into Buyer's Nominated Barge at the
          HMT, in a timely manner.

     ii.  All costs and expenses, including transportation, re-refining and
          handling costs incurred in returning and replacing non-specification
          loaded oil and Loaded Oil shall be paid by the party responsible for
          the contamination. Responsibility shall be determined by analyzing the
          Buyer's barge retain sample or Chevron's Loaded Sample of Section 7.1
          and the Buyer's loaded sample of Section 11.1.ii. If Buyer and Chevron
          cannot agree whether the Chevron's Loaded Oil or the loaded oil meet
          the qualities specified in Article IV, then the applicable samples in
          the possession of Chevron, Buyer and the Independent Inspector which
          relate to the oil in question shall be submitted to a mutually agreed
          upon independent laboratory, whose determination shall be final and
          binding on both parties. Chevron shall have the responsibility for
          Buyer's transportation and handling costs for its own re-refining cost
          if it is determined that the qualities described in Article IV are not
          met by the Delivered Oil. Otherwise, Buyer shall be responsible for
          Chevron's handling and re-refining cost and its own transportation and
          handling costs. The responsible party shall reimburse the other party
          for such costs and expenses within sixty (60) Days of the delivery
          date of the non-specification loaded oil. However, in no event shall
          such party be responsible for any indirect, consequential, special or
          incidental damages of any kind whether based in contract, tort
          (including without limitation negligence or strict liability),
          warranty or otherwise allegedly caused by or based upon the quality of
          the non-specification loaded oil. Chevron and Buyer shall share
          equally the cost of any independent inspections.

Section 11.4:  Coast Guard Dock Watch Requirements

Buyer shall be responsible for meeting all Coast Guard dock watch requirements
at Hilo, Hawaii and Kahului, Maui.  Charges levied by any governmental agency
for the use of their facilities at Hilo, Hawaii or Kahului, Maui, including but
not limited to the State of Hawaii's wharf and pipeline fees, shall be for
Buyer's account.

Section 11.5:  Custody of Received Oil

Chevron will accept custody and exercise control of Received oil having
conditionally acceptable quality per Section 11.6 at the flange connecting
Chevron's independently owned pipeline at each location [---]. Title and risk of
loss shall remain with Buyer. Not withstanding Article 18, Chevron shall not be
responsible for any type of loss of the oil while it is in Chevron's custody
except when loss or damage is caused by Chevron's gross negligence or willful
misconduct in receiving, handling, storing, or delivering such oil. Received oil
will be commingled with Chevron's Oil in Chevron's tankage at Chevron's Kahului,
Maui or Hilo, Hawaii terminals.

                                       20
<PAGE>
 
Section 11.6:  Determination of Quality of Received Oil at Unloading

     i.   Quality of Received oil at the unloading location shall be determined 
          by testing a volumetric weighted average composite of representative
          samples taken from Carrier's barge tanks by the Independent Inspector.
          See Addendum No. 2 hereto for an overview of all Chevron sampling.
          Samples will be divided into three parts and dated. One part shall be
          tested promptly per Section 11.6.ii. One part shall be labeled
          "Chevron's Received Sample," one part shall be sealed and labeled
          "Chevron's Received Retain" which shall be retained by the Independent
          Inspector for a period of not less than three (3) Months.

     ii.  To facilitate Buyer's barge turnaround, Chevron shall promptly 
          perform a preliminary analysis on one part of the sample taken in
          Section 11.6.i for its API gravity, appearance and in the case of
          Diesel also for its flash point. Received Oil will be considered
          conditionally acceptable if its API gravity is within 0.3 degrees of
          its gravity delivered to Buyer under Article VI. Received oil will be
          considered acceptable if its API gravity is within 0.3 degrees of the
          Supplier's loaded sample gravity as determined in Section 11.1.ii, and
          for diesel cargoes, if its Flash point is above its 150 degrees F 
          specification of Section 4.2.

     iii. Notwithstanding the above conditional acceptance, Chevron may use 
          Chevron's Received Sample to determine all the qualities described in
          Article IV for Received oil. Within thirty (30) Days after each oil
          cargo unloading, Chevron shall give Buyer notice of any claim of
          contamination of Chevron's Oil from commingling with Received oil. In
          the event that such claim is not resolved within thirty (30) Days of
          the original claim, the Independent Inspector shall prepare, in whole
          or in part from the samples in its possession, a representative sample
          of the disputed delivery ("Referee Sample") which shall be submitted
          to a mutually agreed upon independent laboratory for a final
          determination, whose determination shall be final and binding on both
          parties. The Referee Sample shall include a volumetric weighted
          proportion of samples as are applicable to the oil in question,
          including Chevron's Received Retain Buyer's remain samples, or in lieu
          thereof samples of the oil from the previous cargo, should the retains
          of the previous cargo be reasonably suspected as a cause of the
          quality

     iv.  If Buyer and Chevron agree or the Independent Inspector determines
          that the quality of the Received oil did not meet the qualities
          described in Article IV, and the Received oil has contaminated
          Chevron's terminal inventories, both Buyer and Chevron shall attempt
          to minimize the impact of any quality problem on Buyer by waiver of
          Buyer's requirement to meet specifications especially if Chevron's use
          of the oil will not significantly harm Chevron, or by Buyer or Chevron
          delivering higher quality oil in a timely manner to produce a
          specification quality blend at Chevron's terminal. If all such, and
          similar, efforts fail to resolve the quality problem, then Buyer will
          reimburse Chevron the transportation, handling and re-refining costs
          of exchanging Buyer's and Chevron's oil, with oil meeting the
          qualities described in Article IV. to the extent the contamination of
          Chevron's terminal inventories was not caused or contributed to by
          Chevron. Such reimbursement shall occur within sixty (60) Days of
          Chevron's original claim. However, in no event shall Buyer be liable
          for any indirect, consequential, special or incidental damages of any
          kind whether based in contract, tort (including without limitation
          negligence or strict liability), warranty or otherwise allegedly
          caused by or based upon the quality of the Received oil.

Section 11.7: Determination of Quantity of Received Oil and Oil at Time of
Custody Transfer

The quantity of Received oil and Received Oil over which Chevron takes custody
shall be determined at the time of each barge cargo unloading by gauging
Chevron's terminal tank before and after pumping. Free water shall be drawn off
prior to each level measurement. Volumes delivered hereunder shall be calculated
in accordance with current measurement standards adopted by industry, ASTM, API
and other standard-setting bodies as applicable in the opinion of the
Independent Inspector and shall be expressed in G.S.V., U.S. barrels @ 60
degrees F. Measurements shall be taken by Chevron and witnessed by Buyer or
Buyer's agent. However, at Buyer's option, such measurement shall be taken by a
mutually agreed upon independent inspector. Buyer and Chevron shall share
equally the cost of independent inspections.

                                       21
<PAGE>
 
Section 11.8:  Commingle Product

In the event that Buyer and Chevron have agreed to commingle their oil in a
barge or vessel compartment to reduce freight costs, and there are discrepancies
between either the quantities of oil loaded per Section 6.1 and unloaded per
Section 11.7 or the qualities of oil loaded per Section 7.1 and unloaded per
Section 11.6, then Buyer and Chevron shall share the benefits or losses of the
discrepancy proportionally to the loaded volumes.

Section 11.9:  Transfer Notification From Kahului and Hilo

Buyer will provide Chevron's terminal representative, during normal working
hours, at least 24-hour notice of any transfers required from Chevron's
facilities in Kahului or Hilo.

Section 11.10:  Custody of Returned Fuel Oil

Buyer shall regain custody and control of Returned Fuel Oil at the flange
connecting Chevron's Hilo terminal pipeline to Buyer's pipeline.

     i.   The quantity of Fuel Oil over which Chevron returns custody shall be 
          determined at the time of each transfer by gauging Chevron's terminal
          tank(s) before and after pumping. Volumes Returned hereunder shall be
          calculated in accordance with current measurement standards adopted by
          industry, ASTM, API and other standard-setting bodies as applicable in
          the opinion of the Independent Inspector and shall be expressed in
          G.S.V., U.S. barrels @ 60 degrees F. Measurements shall be taken by
          Chevron and witnessed by Buyer or Buyer's agent. However, at Buyer
          option, such measurements shall be taken by the Independent Inspector.
          Buyer and Chevron shall share equally the cost of independent
          inspections.

     ii.  Chevron shall maintain a record of Buyer's net Fuel Oil inventory
          stored in its Hilo terminal based on receipts as determined in Section
          11.7 and returns as determined in Section 11.10.i. Chevron will
          provide book inventory records once each week, convenient to Chevron's
          normal weekly inventory period..

Section 11.11:  Custody of Returned Diesel

Buyer shall regain, custody and control of Returned diesel at the end of the
fill pipe connecting Chevron's terminal pipelines to Carrier's tank trucks.
Transfers will be made in minimum 5,000 gallons per delivery load.

     i.   The quantity of diesel over which Chevron returns custody shall be 
          determined at the time of each transfer by reading Chevron's
          calibrated meters corrected in each instance in accordance with
          current measurement standards adopted by industry, ASTM, API and other
          standard-setting bodies as applicable in the opinion of the
          Independent Inspector and shall be expressed in G.S.V., U.S. barrels
          or U.S. gallons @ 60 degrees F. If Buyer or Chevron have reason to
          believe that the quantity of Returned diesel stated for a particular
          transfer is incorrect, that party shall within fifteen Days of the
          transfer date, present the other party with documentation supporting
          such determination and the parties will confer, in good faith, on the
          causes for the discrepancy and shall proceed to correct such causes
          and adjust the quantity, if justified, for the transfers in question.

     ii.  Chevron shall maintain records of Buyer's net diesel inventories 
          stored at each of its Kahului, Maui and Hilo, Hawaii terminals, based
          on receipts as determined in Section 11.7 and returns as determined in
          Section 11.11.i. Chevron will provide book inventory records once each
          week, convenient to Chevron's normal weekly inventory period.

     iii. Chevron will periodically reconcile meter measurements with tank
          gaugings. Buyer may review Chevron's reconciliation calculations.
          However, there will be no retroactive adjustments to the volumes
          delivered or received as a result of this procedure.

                                       22
<PAGE>
 
Section 11.12:  Return Oil Quantities

Chevron shall be under no obligation to provide Buyer quantities of Returned oil
greater than Buyer's current net oil inventory. However, Chevron will attempt to
meet Buyer's unanticipated needs, after considering the needs of its other
customers and its own available inventory.

Section 11.13:  Transfer of Returned Oil

     i.   Returned oil transferred by Chevron shall meet the qualities 
          described in Article IV. Chevron, or at Buyer's option the Independent
          Inspector, shall draw a volumetric weighted average composite sample
          representative of the oil in Chevron's tanks on Maui and Hawaii after
          each receipt of Buyer's or Chevron's oil in order to verify the
          quality of the Returned oil in Chevron's terminal ("Chevron's Returned
          sample"). This sample will be divided into three parts and dated. .
          See Addendum No. 2 hereto for an overview of Chevron sampling. One
          part of this sample shall be promptly tested by Chevron for its API
          gravity, appearance and in the case of diesel also for its flash
          point. Buyer and Chevron agree that successful passage of the prompt
          test on this sample is sufficient evidence for Chevron to return oil
          to Buyer, without limiting Buyer's rights within Section 11.13.ii. One
          part of the Chevron's Returned sample shall be retained by Chevron and
          one part shall be sealed and shall be provided to the Independent
          Inspector to be retained for a period of not less than three (3)
          Months.

     ii.  Notwithstanding the above conditional acceptance, if a quality 
          problem with the Returned oil is reasonably indicated, Buyer may
          obtain and analyze a sufficient portion of Chevron's Returned Sample
          in the possession of the Independent Inspector to determine all the
          qualities described in Article IV for the Returned oil. Within thirty
          (30) Days after each oil delivery, Buyer shall give Chevron notice of
          any claim of contamination and of resulting losses. In the event that
          such claim is not resolved within thirty (30) Days of the original
          claim, the Independent Inspector shall prepare, in whole or in part
          from the samples in its possession, a representative sample of the
          disputed delivery ("Referee Sample") which shall be submitted to a
          mutually agreed upon independent laboratory for a final determination,
          whose determination shall be final and binding on both parties. The
          Referee Sample shall include a volumetric weighted proportion of
          samples as are applicable to the oil in question..

     iii. If Buyer and Chevron agree or the Independent Inspector determines
          that the quality of the Returned oil did not meet the qualities
          described in Article IV and that and indicates that Chevron's terminal
          inventories, including Buyer's oil stored there and Buyer's power
          plant inventories are contaminated, both Buyer and Chevron shall
          attempt to minimize the impact of any quality problem on Chevron by
          waiver of Chevron's requirement to meet specifications, especially if
          Buyer's use of the oil will not significantly harm Buyer, or by
          Chevron Delivering higher quality oil to produce a specification
          quality blend at Chevron's terminal inventory and Buyer's plants. If
          all such, and similar, efforts fail to resolve the quality problem,
          then Chevron will, at Chevron's expense, exchange Buyer's Returned oil
          to the extent the contamination of Buyer's other similar oil was
          caused or contributed to by Chevron, and, if appropriate, any of
          Buyer's other similar oil which has been downgraded by commingling
          with the Returned oil, with oil meeting the qualities described in
          Article IV. Chevron shall make its best, reasonable effort to replace
          Buyer's oil in a timely manner. However, in no event shall Chevron be
          liable for any indirect, consequential, special or incidental damages
          of any kind whether based in contract, tort (including without
          limitation negligence or strict liability), warranty or otherwise
          allegedly caused by or based upon the quality of the Returned oil.

Section 11.14:  Terminaling and Handling Fees

Effective upon the commencement of this Contract, Chevron will invoice Buyer and
Buyer will pay Chevron per Article IX, terminaling and handling fees based on
the quantities of oil determined in Section 11.7 at the rates listed below.

                                       23
<PAGE>
 
     i.   At Kahului, Maui, the terminaling and handling fee shall be [---] 
          per gallon of diesel [---] per physical barrel of diesel).

     ii.  At Hilo, Hawaii, the terminaling and handling fee shall be [---] per 
          gallon of oil [---] per physical barrel of oil).

     iii. The terminaling and handling fees specified in Section 11.14i and 
          Section 11.14.ii shall be subject to [---], 50% of the annual
          escalation factor shall be the arithmetic average of the hourly
          earnings in dollars per hour for the petroleum and coal products
          industry as shown in the "Employment and Earning" publication of the
          U.S. Department of Labor, Bureau of Labor Statistics, for the three
          Months of the second calendar quarter immediately preceding the
          calendar quarter of the Month in which services are rendered, divided
          by the arithmetic average of the hourly earnings in dollars per hour
          for the petroleum and coal products industry as shown in the
          "Employment and Earning" publication of the U.S. Department of Labor,
          Bureau of Labor statistics, for the Months January through March, 1997
          (20.353);the remaining 50% of the annual escalation factor shall be
          the arithmetic average of the Producer Price Index (PPI) for
          Industrial Commodities as published by the U.S. Department of Labor,
          Bureau of Labor Statistics, for the three Months of the second
          calendar quarter immediately preceding the calendar quarter of the
          Month in which services are rendered, divided by the arithmetic
          average of the Producer Price Index (PPI) for Industrial Commodities
          as published by the U.S. Department of Labor, Bureau of Labor
          Statistics, for the Months January through March, 1997 (128.50).

For the purpose of invoicing, the terminaling and handling services shall be
considered received by Buyer when Chevron first takes custody of Buyer's oil per
Section 11.5.


                                  ARTICLE XII
                                 CONTINGENCIES
                                 -------------

Section 12.1:  Definition of Contingency

As used in this Article XII, the term "Contingency" means: 

     (a)  any event reasonably beyond the control of the party affected;

     (b)  compliance, voluntary or involuntary, with a direction or request of 
          any government or person purporting to act with governmental
          authority; excluding, however, any such direction or request
          restricting or otherwise regulating combustion of the oil to be
          purchased by Buyer hereunder, the effect of which restrictions or
          regulation upon the parties' performance shall be governed by Section
          12.5 of this Contract;

     (c)  total or partial expropriation, nationalization, confiscation, 
          requisitioning or abrogation or breach of a government contract or
          concession;

     (d)  closing of, or restriction on the use of, a port or pipeline;

     (e)  maritime peril (including but not limited to, negligence in 
          navigation or management of vessel, collision, stranding, destruction,
          or loss of vessel), storm, earthquake, flood;

     (f)  accident, fire, explosion;

     (g)  hostilities or war (declared or undeclared), embargo, blockage, riot, 
          civil unrest, sabotage, revolution, insurrection;

     (h)  strike or other labor difficulty (whomever's employees are involved), 
          even though the strike or other labor difficulty could be settled by
          acceding to the demands of a labor group; or,

                                       24
<PAGE>
 
     (i)  loss or shortage of supply, production, manufacturing, distribution, 
          refining, transportation, Delivery facilities, receiving facilities,
          equipment, labor, material, power generation or power distribution
          caused by circumstances which the affected party is not able to
          overcome by the exercise of reasonable diligence or which the affected
          party is able to overcome only at substantial additional expense in
          relation to the expected revenue, benefits or rights related directly
          to this Contract.

Section 12.2:  Obligation to Supply Product

Chevron shall not be obligated to sell or deliver Oil or Jet to the extent that
performance of this Contract is prevented, restricted or delayed by a
Contingency which significantly affects Chevron's ability to supply, manufacture
or transport Diesel  or Jet to Buyer under this Contract from [---].  In such
circumstances, Deliveries of Oil or Jet to Buyer may be reduced on a basis as
equitable to Buyer as to Chevron's and its affiliates' other customers of crude
and petroleum products, and Chevron shall not be obligated to acquire additional
crude, oil or jet but to the extent that it does acquire additional crude, oil
or jet, Buyer shall be entitled to an equitable share of the oil or jet acquired
or derived from the crude acquired, at a price to be agreed from time to time.

Section 12.3:  Obligation to Purchase Product

Buyer shall not be obligated to purchase, receive or use Oil or Jet to the
extent that performance of this Contract in the customary manner is prevented,
restricted or delayed by a Contingency.  In such circumstances, purchases from
Chevron may be reduced on any basis as equitable to Chevron as to Buyer's other
suppliers of oil or jet.

Section 12.4:  Price Determination Prevention

If at any time any price determined under this Contract cannot be given effect
because to do so would violate a direction or request of any government or
person purporting to act with governmental authority, Buyer and Chevron shall
attempt to agree on an alternate course of action but failing agreement within
ten (10) Days the party adversely affected may suspend performance with respect
to the quantity of Oil or Jet affected by the direction or request.

Section 12.5:  Governmental Regulation Requirements

To the extent that any governmental regulation requires combustion of oil or jet
meeting specifications other than those in Article IV, Buyer and Chevron shall
negotiate in good faith to agree on an alternative course of action that will
reasonably allow Buyer to comply with such regulation while fulfilling its
minimum annual purchase volume commitment  under Article III, at a price and on
other terms and conditions that are fair to both parties. Chevron shall have no
obligation to Deliver oil or jet meeting new specifications if it is not
available for purchase from third parties and Chevron cannot manufacture such
oil or jet in existing facilities without substantial new capital investment.

If Buyer and Chevron do not agree on such an alternative course of action, then
Buyer may comply with such regulation in any reasonable manner it chooses,
including the option to purchase from other sources for its plants located
within the area in which such regulation specifically applies, fuels which will
enable Buyer to comply with such regulation. In such case, Buyer's minimum
purchase requirement under Article III shall be reduced accordingly.

Section 12.6:  Chevron's Obligations Under Contract

     [---]

                                       25
<PAGE>
 
     [---]
     [---]


                                  ARTICLE XIII
                       EFFECT OF SUSPENSION OR REDUCTION
                       ---------------------------------

Section 13.1:  Event of Suspension

In the event of any suspension of sales and Deliveries under Article XII,
Chevron shall not be obligated to sell and Buyer shall not be obligated to buy,
after the period of suspension or reduction, the undelivered quantity of Oil or
Jet which normally would have been sold and Delivered hereunder during the
period of suspension or reduction.

Section 13.2:  Suspension For More Than 180 Days

If sales and Deliveries are suspended under Article XII for more than one
hundred eighty (180) Days, Chevron or Buyer shall then have the option while
such suspension continues to terminate its obligations to the other party under
this Contract on thirty (30) Days' written notice to the other party.

Section 13.3:  Notification of Suspension

Any party which relies upon Article XII shall give the other party prompt notice
thereof specifying the anticipated amount and duration of any suspension or
reduction of Deliveries. It shall also give prompt notice when it no longer
expects to rely on Article XII and Deliveries shall be reinstated subject to all
conditions of this Contract, unless this Contract has been terminated previously
under Section 13.2.

Section 13.4:  Obligation to Pay In Full

Nothing in Article XII shall relieve Buyer of the obligations to pay in full in
United States currency for the Oil or Jet sold and Delivered hereunder and for
other amounts due to Buyer to Chevron under this Contract, nor relieve Chevron
of the obligation to return to Buyer the net positive inventory of Buyer's oil
stored in Chevron's Hilo, Hawaii and Kahului, Maui terminals.

Section 13.5:  Suspension Not A Breach Of Contract

While Deliveries are suspended or reduced by Chevron pursuant to Article XII, it
shall not be a breach of this Contract for Buyer to buy from a supplier other
than Chevron the quantities of Oil or Jet which Chevron does not Deliver. During
this period of time, there will be no minimum volume requirements. After any
suspension or reduction has ended, minimum and maximum volume requirements for
the semiannual period in which the suspension or reduction occurred will be
reduced in proportion to the ratio of the number of Days within the semiannual
period during which no suspension or reduction was in effect, to the number of
Days within the semiannual period.


                                  ARTICLE XIV
                          WAIVER AND NONASSIGNABILITY
                          ---------------------------

Section 14.1:  Waiver By One Party

Waiver by one party of the other's breach of any provision of this Contract
shall not be deemed a waiver of any subsequent or continuing breach of such
provisions or of the breach of any other provision or provisions hereof.

                                       26
<PAGE>
 
Section 14.2:  Assignability of Contract

This Contract shall not be assignable by either party without the written
consent of the other, which shall not be unreasonably withheld, except that
Chevron may assign this Contract to any affiliate, provided that any such
assignment shall not release Chevron from any of its obligations hereunder, and
except that HECO, MECO, MECO-Molokai, and HELCO may assign their interests in
the Contract to the Trustee under their respective First Mortgage Bond
Indentures. Chevron does not, by agreement to such an assignment, waive any
right it may have to terminate this Contract for any breach hereof occurring at
any time before or after any such assignment or release Buyer of any obligations
arising under this Contract after any such assignment.  Following any such
assignment, no further assignment may be made without the consent of Chevron.


                                   ARTICLE XV
                              CONFLICT OF INTEREST
                              --------------------

Conflicts of interest related to this Contract are strictly prohibited. Except
as otherwise expressly provided herein, neither party nor any director, employee
or agent of a party shall give to or receive from any director, employee or
agent of the other party any gift, entertainment or other favor of significant
value, or any commission, fee or rebate. Likewise, neither party nor any
director, employee or agent of a party shall enter into any business arrangement
with any director, employee or agent of the other party (or any affiliate),
unless such person is acting for and on behalf of the other party, without prior
written notification thereof to the other party. In the event of any violation
of this paragraph, including any violation occurring prior to the date of this
Contract which resulted directly or indirectly in one party's consent to enter
into this Contract with the other party, such party may, at its sole option,
terminate this Contract at any time and, except for Buyer's obligation to pay in
full in United States currency for the Oil sold and Delivered hereunder and for
other amounts due by Buyer to Chevron under this Contract, and for Chevron's
obligation to return to Buyer the net positive inventory of Buyer's oil stored
in Chevron's Hilo, Hawaii and Kahului, Maui terminals, shall be relieved of any
further obligation under this Contract.

Both parties agree to immediately notify the other of any known violation of
this Article.


                                  ARTICLE XVI
                                    DEFAULT
                                    -------

If Buyer or Chevron considers the other party to be in default of any obligation
under this Contract, such party shall give the other party notice thereof.  Such
other party shall then have 30 Days in which to remedy such default.  If the
default is not remedied, the other party may, without prejudice to any other
right or remedy of such party in respect of such breach, terminate its
obligations under this Contract, except for Buyer's obligation to pay in full in
United States currency for the Oil or Jet sold and Delivered hereunder and for
other amounts due by Buyer to Chevron under this Contract, and for Chevron's
obligation to return to Buyer the net positive inventory of Buyer's oil stored
in Chevron's Hilo, Hawaii and Kahului, Maui terminals, by forty five (45) Days'
written notice to the party in breach. Any termination shall be without
prejudice to accrued rights. All rights and remedies hereunder are independent
of each other and election of one remedy shall not exclude another.

Except as provided under Sections 18.2 and 18.4, in no event shall either party
be liable for any indirect, consequential, special or incidental damages of any
kind whether based in contract, tort (including without limitation negligence or
strict liability), warranty or otherwise.

Chevron's termination of its obligations to a Buyer in this Contract due to
default by that Buyer shall not terminate Chevron's obligations to the remaining
Buyers not in default of this Contract.

                                       27
<PAGE>
 
                                  ARTICLE XVII
                                 APPLICABLE LAW
                                 --------------

This Contract shall be construed in accordance with, and all disputes arising
hereunder shall be determined in accordance with, the local law of the State of
Hawaii, U.S.A.


                                 ARTICLE XVIII
                                   INDEMNITY
                                   ---------

Section 18.1:  Buyer Held Harmless for General Indemnity where title and risk of
loss is with Chevron

Chevron shall indemnify, defend and hold harmless Buyer, its directors,
officers, employees and agents (including but not limited to affiliates and
contractors and their employees) from and against all liabilities, damages,
losses, penalties, claims, demands, suits, costs, expenses (including reasonable
attorneys' fees), and proceedings of any nature whatsoever for personal injury
(including death), or property damage, including but not limited to Buyer's
facilities (collectively "Injury or Damage"), that results from non-
specification or contaminated Delivered Oil or Jet, or that arises out of or is
in any manner connected with the Delivery or Receipt of Oil or Jet related to
this Contract at Chevron's facilities when in the custody of Chevron or the
transportation of Oil or Jet related to this Contract when in the custody of
Chevron, except to the extent that such Injury or Damage may be attributable to
the negligence or willful action of Buyer.  This Section 18.1 shall not include
any indirect, consequential, special or incidental damages of any kind whether
based in contract, tort (including without limitation negligence or strict
liability), warranty or otherwise.

Section 18.2:  Buyer Held Harmless for Releases to the Environment when title
and risk of loss is with Chevron

Without limiting the generality of Section 18.1, Chevron shall indemnify, defend
and hold harmless Buyer, its directors, officers, employees and agents
(including but not limited to affiliates and contractors and their employees)
from and against all liabilities, damages, losses, penalties, claims, demands,
suits, costs, expenses, and proceedings of any nature whatsoever directly or
indirectly arising out of or attributable to the release, threatened release,
discharge, disposal or presence of Oil, Jet or hazardous material related to
this Contract when in the custody of Chevron, or of Diesel sold pursuant to the
provisions of Section 6.5 herein when in the custody of any Chevron-chartered
barge, except to the extent that such release, threatened release, discharge,
disposal or presence of Oil, Jet or hazardous material may be attributable to
the negligence or willful action of Buyer, including without limitation: (1) all
foreseeable and unforeseeable consequential damages; (2) the reasonable costs of
any required or necessary repair, cleanup or detoxification of an area of oil,
jet or hazardous material and the preparation and implementation of any closure,
remedial or other required plans; (3) the reasonable costs of the investigation
of any environmental claims by Buyer; (4) the reasonable costs of Buyer's
enforcement of this Contract; and (5) all reasonable costs and expenses incurred
by Buyer in connection with clauses (1), (2), (3), and (4), including without
limitation reasonable attorneys' fees and court costs.

Section 18.3:  Chevron Held Harmless For General Indemnity when title and risk
of loss is with Buyer

Buyer shall indemnify, defend and hold harmless Chevron, its directors,
officers, employees and agents (including but not limited to affiliates and
contractors and their employees) from and against all liabilities, damages,
losses, penalties, claims, demands, suits, costs, expenses (including reasonable
attorneys' fees), and proceedings of any nature whatsoever for personal injury
(including death), or property damage, including but not limited to Chevron's
facilities (collectively "Injury or Damage"), that results from non-
specification or contaminated Received oil or jet, or that arises out of or is
in any manner connected with the Delivery or receipt of oil or jet at Chevron's
facilities when in the custody of Buyer, any carrier or subsequent buyer of oil
or jet related to this Contract or the transportation of oil or jet when in the
custody of Buyer, any carrier or subsequent buyer of oil or jet related to this
Contract, except to the extent that such Injury or Damage may be attributable to
the negligence or willful action of Chevron.  This Section 18.3 shall not
include any indirect, consequential, special or incidental

                                       28
<PAGE>
 
damages of any kind whether based in contract, tort (including without
limitation negligence or strict liability), warranty or otherwise.

Section 18.4:  Chevron Held Harmless for Releases to the Environment when title
and risk of loss is with Buyer

Without limiting the generality of Section 18.3, Buyer shall indemnify, defend
and hold harmless Chevron, its directors, officers, employees and agents
(including but not limited to affiliates and contractors and their employees)
from and against all liabilities, damages, losses, penalties, claims, demands,
suits, costs, expenses, and proceedings of any nature whatsoever directly or
indirectly arising out of or attributable to the release, threatened release,
discharge, disposal or presence of oil, jet or hazardous material related to
this Contract when in the custody of Buyer, any carrier (except any Chevron-
chartered barge carrying Diesel sold pursuant to the provisions of Section 6.5
herein) or subsequent buyer of oil or jet related to this Contract, except to
the extent that such release, threatened release, discharge, disposal or
presence of oil, jet or hazardous material may be attributable to the negligence
or willful action of Chevron, including without limitation:  (1) all foreseeable
and unforeseeable consequential damages; (2) the reasonable costs of any
required or necessary repair, cleanup or detoxification of an area of oil, jet
or hazardous material and the preparation and implementation of any closure,
remedial or other required plans; (3) the reasonable costs of the investigation
of any environmental claims by Chevron; (4) the reasonable costs of Chevron's
enforcement of this Contract; and (5) all reasonable costs and expenses incurred
by Chevron in connection with clauses (1), (2), (3), and (4), including without
limitation reasonable attorneys' fees and court costs.


                                  ARTICLE XIX
                          PUBLIC UTILITIES COMMISSION
                          ---------------------------

Section 19.1:  Filing Requirements; Buyers Energy Cost Adjustment Clause

This Contract is required to be filed with the Hawaii Public Utilities
Commission ("PUC") for approval.  If in the proceedings initiated as a result of
the filing of this Contract the PUC disapproves or fails to authorize the full
recovery of the fuel costs incurred under this Contract through Buyer's Energy
Cost Adjustment Clause, Buyer may terminate this Contract at any time within
ninety (90) Days of disapproval by giving sixty (60) Days' written notice to
Chevron.

Section 19.2:  Decision and Order Impairing Chevron

In the event that a Decision and Order or other action by a governmental
regulatory body impairs Chevron's ability to enforce any terminal and safety
protection or operation provisions under this Contract, Buyer and Chevron shall
attempt to agree on an alternate course of action, but failing agreement within
10 Days, the Chevron may suspend performance with respect to the quantity of oil
or jet affected by said Decision and Order after giving Buyer ninety (90) Days'
written notice.

Section 19.3:  Use as a Public Utility

No use of the pipelines, facilities or equipment owned by Chevron and used in
connection with this Contract shall be construed as having been dedicated by
Chevron to a public use and it is hereby acknowledged by the parties that
Chevron retains the exclusive right to determine who, other than the parties to
this Contract, shall use said pipelines, facilities, and equipment.

                                       29
<PAGE>
 
                                   ARTICLE XX
                                   INSURANCE
                                   ---------

Section 20.1:  Requirements

Without in any way limiting Buyer's liability pursuant to this Contract, Buyer
shall maintain and require any carrier or subsequent buyer of oil or jet related
to this Contract to maintain the following insurance and all insurance that may
be required under the applicable laws, ordinances, and regulations of any
governmental authority:

     i.   Workers' Compensation and Employers' Liability Insurance as 
          prescribed by applicable law, including insurance covering liability
          under the Longshoremen's and Harbor Workers' Act, the Jones Act and
          the Outer Continental Shelf Land Act, if applicable.

     ii.  Commercial General Liability Insurance including Bodily Injury and 
          Property Damage Insurance with a limit not less than $1,000,000
          combined single limit per occurrence.

     iii. Automobile Bodily Injury and Property Damage Liability Insurance on 
          all owned, non-owned and hired vehicles used in receiving oil or jet
          from Chevron's facilities with a limit not less than $1,000,000
          combined single limit per occurrence for bodily injury and property
          damage.

     iv.  Hull and Machinery Insurance including collision liability and 
          tower's liability on vessels engaged in towage with a limit at least
          equal to the actual value of each vessel and barge.

     v.   Marine Insurance under one of the two following options:

          Option One:  Protection and Indemnity Insurance including coverage 
                       for injuries to or death of masters, mates and crew and
                       excess collision liabilities. The limits of such
                       insurance shall not be less than $25 million per
                       occurrence. Vessel pollution liability insurance
                       including coverage for pollution liabilities imposed by
                       federal and state laws now or hereafter in effect in an
                       amount not less than $500 million; or,

          Option Two:  Protection and Indemnity Insurance on a full entry basis 
                       with an International Group P&I Club. Such insurance
                       shall include, but not be limited to, coverage for
                       injuries to or death of masters, mates and crew; excess
                       collision liabilities and pollution liabilities imposed
                       by federal and state laws now or hereafter in effect).
                       Such insurance shall be unlimited as per International
                       Group, P&I Club rules except for pollution liabilities
                       which shall be limited to $500 million or the maximum
                       pollution limit offered by the P&I Clubs of the
                       International Group.

Section 20.2:  Change of Insurance Notification

The above insurance shall include a requirement that the insurer provide Chevron
with 30 Days' written notice prior to the effective date of any cancellation or
material change of the insurance.  The insurance specified in Sections 20.1 (i)
and 20.1 (iv) shall contain a waiver of subrogation against Chevron and an
assignment of statutory lien, if applicable.  The insurance specified in
Sections 20.1 (ii), 20.1 (iii), and 20.1 (v) Option One Protection and Indemnity
Insurance shall name Chevron as additional insured.

Section 20.3:  Certificate of Insurance From Subsequent Buyers and Carriers

Before performance of this Contract, Buyer shall provide Chevron with
certificates or other documentary evidence satisfactory to Chevron of the
insurance coverages and endorsements.

                                       30
<PAGE>
 
Section 20.4:  Obtaining Insurance Documents

Without in any way limiting Chevron's liability, Chevron shall obtain from any
Chevron carrier or subsequent buyer from Chevron of oil or jet related to this
Contract the insurance coverages and endorsements set forth in this Article
excepting that both Chevron and Buyer be named as additional insureds.

Section 20.5:  Terminaling and Handling Fees Insurance Exclusion

The terminaling and handling fees listed in Section 11.14 do not include any
insurance covering loss of Buyer's oil or jet while it is in the custody of
Chevron. It is expressly understood and agreed that insurance, if any is desired
by Buyer, shall be carried by Buyer at its own expense.


                                  ARTICLE XXI
                       SAFETY AND TERMINATION PROTECTION
                       ---------------------------------

Section 21.1:  Operating and Safety Regulations

Any buyer or carrier of oil or jet related to this Contract or their agents
shall comply with all of the operating and safety regulations of Chevron, as
amended from time-to-time, when alongside, upon, or when approaching the
premises of Chevron for the purpose of loading oil or jet related to this
Contract or when departing Chevron's premises after loading oil or jet related
to this Contract.  In particular, all smoking shall be limited to such locations
and occasions as are specifically authorized in writing by Chevron.  If Chevron
determines that an unsafe condition exists, Chevron may, at its absolute
discretion, cease the loading or unloading operations and order any buyer or
carrier of oil or jet related to this Contract or their agents to leave its
place of mooring.  Any loss or damage incurred by Chevron, any buyer or carrier
of oil or jet related to this Contract or their agents due to any violation by
any buyer or carrier of oil or jet related to this Contract or their agents of
Chevron's operating and safety regulations shall be for Buyer's or Carrier's
account.  Copies of Chevron's operating and safety regulations are available
upon request.

Section 21.2:  Right To Refuse Acceptance

In addition to its rights under Section 21.1, Chevron shall have the[---] of any
barge or vessel nominated by Buyer to load or discharge if in Chevron's
Terminal's [---] for [---].  Chevron's Terminal's acceptance or rejection of
Buyer's Nominated Barge or vessel shall be communicated to Buyer within [---]
hours after the Terminal's receipt of nomination, and in the event Buyer's barge
nomination is rejected, Chevron shall provide Buyer satisfactory documentation
of the basis for the rejection of such nomination.  Chevron's Terminal's
acceptance or rejection of any barge or vessel shall not constitute a continuing
acceptance or rejection of such barge or vessel for subsequent loading or
discharge.  Chevron shall not be liable for any loss, damage or delay caused by
its rejection of a vessel nomination hereunder, nor any loss, damage or delay
caused by its rejection of a vessel for failure to comply pursuant to Section
21.1.  In no event shall the acceptance of a vessel by Chevron be construed in
any manner as a representation as to the vessel's operational, environmental or
safety status.  Neither Buyer nor any other party shall be entitled to rely on
any such acceptance of a vessel by Chevron hereunder.


                                  ARTICLE XXII
                              POLLUTION MITIGATION
                              --------------------

Section 22.1:  Responsibility to Mitigate

In the event an escape or discharge of oil or jet occurs from any barge or
vessel carrying oil or jet related to this Contract and causes or threatens to
cause pollution damage, Buyer or carrier will promptly take whatever measures
are necessary to prevent or mitigate such damage.  Buyer hereby authorizes
Chevron, or its agent, at

                                       31
<PAGE>
 
Chevron's option, upon notice to Buyer or master on the tug, to undertake such
measures as are reasonably necessary to prevent or mitigate the pollution
damage.  Chevron or its agent shall keep Buyer advised of the nature and results
of any such measures taken and, if time permits, intended to be taken.  Any of
the aforementioned measures shall be at Buyer's sole expense (except to the
extent that such escape or discharge was caused by the negligence or willful
action of Chevron or its agent), provided that if Buyer considers said measures
should be discontinued, Buyer shall so notify Chevron or its agent and
thereafter Chevron or its agent shall have no right to continue said measures at
Buyer's authority or expense except as provided in Section 18.4.  This provision
shall be applicable only between Buyer and Chevron and shall not affect, as
between Buyer and Chevron, any liability of Buyer to any third parties,
including but not limited to governments.

Section 22.2:  Cooperation With Chevron's Measures

In addition to its duties under Section 22.1, Buyer agrees to cooperate with all
efforts and to pay all reasonable costs associated with preventive booming or
other preventive measures that Chevron reasonably determines is advisable on an
isolated or routine basis.


                                 ARTICLE XXIII
                                 MISCELLANEOUS
                                 -------------

Section 23.1:  Heading of Articles and Sections

Headings of the Articles and Sections are for convenient reference only and are
not to be considered part of this Contract.

Section 23.2:  Content of Document

This document contains the entire agreement between the parties covering the
subject matter and cancels, as of the Effective date hereof, all prior
agreements of any kind between the parties covering such subject matter and any
amendments thereto.  There are no other agreements which constitute any part of
the consideration for, or any condition to, either party's compliance with its
obligations under this Contract.

Section 23.3:  Notification

Except as otherwise expressly provided herein, all notices shall be given in
writing, by letter, facsimile, electronic mail  to the following addresses, or
such other address as the parties may designate by notice, and shall be deemed
given upon receipt.

          Chevron:     Manager, Petroleum Coke, Heavy Fuels & Sulfur
                       Chevron Products Company,
                       A Division of Chevron U.S.A. Inc
                       P.O. Box 7006
                       San Francisco, CA  94120-7006
                       FAX:  (415) 894-1195

          Buyer:       Manager, Power Supply Services Department
                       Hawaiian Electric Company, Inc.
                       P.O. Box 2750
                       Honolulu, HI  96840-0001
                       FAX:  (808) 543-4366

The Manager, Power Supply Services Department, for Hawaiian Electric Company,
Inc., shall be responsible for forwarding notices to the other parties to this
Contract.

                                       32
<PAGE>
 
Section 23.4:  Court Rulings

If any term or provision, or any part of any term or provision, of this Contract
is held by any court or other competent authority to be illegal or
unenforceable, the remaining terms, provisions, rights and obligations shall not
be affected.

Section 23.5:  Benefit of And Binding

This Contract shall inure to the benefit of and be binding upon the parties
hereto, their successors and permitted assigns.

Section 23.6:  Effective Date and Supersedence

Effective as of the Effective Date of the Term hereunder, this Contract hereby
supersedes that certain Inter-Island Industrial Fuel Oil and Diesel Fuel
Contract between the parties dated, November 20, 1995 and all amendments
thereto.

                                       33
<PAGE>
 
          IN WITNESS WHEREOF, the parties have caused these presents to become
effective as of the day and year first herein above written.

ACCEPTED AND AGREED:
"Chevron"

CHEVRON PRODUCTS COMPANY,
A DIVISION OF CHEVRON U.S.A. INC

BY:  /s/ Phillip H. Fisher
     ---------------------
         Phillip H. Fisher

TITLE:  Manager, Petroleum Coke, Heavy Fuels & Sulfur

"Buyers"

HAWAIIAN ELECTRIC COMPANY, INC.        MAUI ELECTRIC COMPANY, LTD.

BY:   /s/ Edward Y. Hirata             BY:   /s/ Edward Y. Hirata
    ------------------------------         ------------------------------

          Edward Y. Hirata                       Edward Y. Hirata
- ----------------------------------     ----------------------------------
          (Printed or Typed Name)                (Printed or Typed Name)

TITLE: Vice President, Regulatory      TITLE: Vice President, Regulatory 
       Affairs                                Affairs
       ---------------------------            --------------------------- 


BY:   /s/ Marvin A. Hawthorne          BY:   /s/ Marvin A. Hawthorne
    ------------------------------         ------------------------------

          Marvin A. Hawthorne                    Marvin A. Hawthorne
- ----------------------------------     ----------------------------------
          (Printed or Typed Name)                (Printed or Typed Name)

TITLE:  Assistant Treasurer            TITLE:  Assistant Treasurer
       ---------------------------            --------------------------- 

                                       34
<PAGE>
 
HAWAII ELECTRIC LIGHT COMPANY, INC.    HAWAIIAN TUG & BARGE CORP.

BY:   /s/ Edward Y. Hirata             BY:   /s/ Glenn K. Y. Hong
    ------------------------------         ------------------------------

          Edward Y. Hirata                       Glenn K. Y. Hong
- ----------------------------------     ----------------------------------
          (Printed or Typed Name)                (Printed or Typed Name)

TITLE:  Vice President, Regulatory     TITLE:  President
        Affairs                               --------------------------- 
       ---------------------------     

HAWAII ELECTRIC LIGHT COMPANY, INC.    HAWAIIAN TUG & BARGE CORP.

BY:   /s/ Marvin A. Hawthorne          BY:   /s/ Lisa M. K. Sakamoto
    ------------------------------         ------------------------------

          Marvin A. Hawthorne                    Lisa M. K. Sakamoto
- ----------------------------------     ----------------------------------
          (Printed or Typed Name)                (Printed or Typed Name)

TITLE:  Assistant Treasurer            TITLE:  Vice President
       ---------------------------            --------------------------- 


YOUNG BROTHERS, LIMITED

BY:   /s/ Glenn K. Y. Hong
    ------------------------------         

          Glenn K. Y. Hong
- ----------------------------------
          (Printed or Typed Name)

TITLE:  President
       ---------------------------


BY:   /s/ Lisa M. K. Sakamoto
    ------------------------------

          Lisa M. K. Sakamoto
- ----------------------------------
          (Printed or Typed Name)

TITLE:  Vice President
       ---------------------------

                                       35
<PAGE>
 
                                 ADDENDUM NO. 1

                        ILLUSTRATIVE SCHEDULE OF PRICES
                        -------------------------------

                Illustrative Product Price Calculation for [---]

I.  NO. 2 DIESEL FUEL

For HECO, HT&B, YB; and MECO or HELCO FOB point of Delivery as per Section 6.3,
Section 6.2 and Section 6.1, respectively:

     [---]
 
where PD1 is equal to the price per physical gallon for the Month of Delivery
for No. 2 Diesel Fuel purchased by HECO, HT&B, YB, MECO or HELCO in U.S. Dollars
("$") per ("/") gallon.

I.   DI = Index for No. 2 Diesel Fuel, which shall be the simple average of the 
     high and low price assessments on all dates of publication for West Coast
     Pipeline, Los Angeles California Low Sulfur No. 2 Diesel as reported by
     Platt's Oilgram Price Report ("Platt's Oilgram") during the period
     beginning the 21st Day of the second preceding Month to the 20th Day of the
     Month preceding Delivery, expressed in $/gallon.

<TABLE>
<CAPTION>
     Date     Low     High     Average
     ----     ---     ----     -------
     <S>      <C>     <C>      <C>    
     [---]

     AVERAGE [---] IN USD      [---] PER GALLON
</TABLE>

II.  [---]

                                       36
<PAGE>
 
               Assume [---] per barrel premium values apply:

          [---]

     [---]

[---]

III.  TD1/TD2/TD3/TD4/TD5 = Taxes applicable to the sale of Diesel pursuant to
      Section 5.3 herein.

      Hawaii General Excise Tax = 4.166% of pre-HGET price
      [---]

      Taxes after application of HGET [---]
           Hawaii Environmental Response Tax  =  $0.05 per barrel, $0.0012 per
             gallon
           Hawaii Liquid Fuel Tax  = $0.01 per gallon

IV.  LP1, LP2, LP3, and LP4 are [---] for Deliveries in bulk to the respective
     Buyer at Kaunakakai, Molokai, Kahului, Maui, Hilo, Hawaii and Kawaihae,
     Hawaii, respectively, during the period indicated and expressed in $ per
     gallon, as follows:

<TABLE>
<CAPTION>
              1988-1989   2000-2001   2002-2004
     <S>      <C>         <C>         <C>
     LP1      [---]       [---]       [---]
     LP2      [---]       [---]       [---]
     LP3      [---]       [---]       [---]
     LP4      [---]       [---]       [---]
</TABLE>

A.  PRODUCT PRICE COMPUTATION FOR [---] DELIVERY OF NO. 2 DIESEL FUEL PURCHASED
    BY HECO, HT&B, YB, MECO OR HELCO HAVING A STANDARD BTU CONTENT  OF [---] TO
    141,000 BTU  PER GALLON

[---] = [---]

      = [---]

where TD1 = sum of

<TABLE>
     <S>                                                         <C>
     HGET = 4.166% of Diesel Index + [---] = 0.04166*[---]=      [---]
     [---] of Diesel Index + [---] =                             [---]
     Hawaii Environmental Response Tax =                         $0.0012/gallon
     Hawaii Liquid Fuel Tax =                                    $0.0100/gallon
                                                                 --------------
                                                                 [---]
</TABLE>

[---] = [---]

      = [---] PER GALLON

                                       37
<PAGE>
 
B.  PRODUCT PRICE COMPUTATION FOR [---] DELIVERY OF NO. 2 DIESEL FUEL PURCHASED
    BY HECO, HT&B, YB, MECO OR HELCO HAVING OTHER THAN A STANDARD BTU CONTENT

    Assume the weighted average BTU content per gallon of the representative
    samples of Diesel purchased by a respective Buyer during a calendar quarter
    was [---].  The price charged for the Diesel sold and Delivered to that
    respective Buyer during each Month of the calendar quarter in question shall
    be adjusted by multiplying the Diesel price by the ratio of the actual heat
    content to a standard of [---].

[---] = [---]
      = [---]
      = [---]

where TD1 = sum of

<TABLE>
     <S>                                                          <C>
     HGET = 4.166% of adjusted (Diesel Index + [---] =            [---]
     [---] of adjusted (Diesel Index + [---] =                    [---]
     Hawaii Environmental Response Tax =                          $0.0012/gallon
     Hawaii Liquid Fuel Tax =                                     $0.0100/gallon
                                                                  --------------
                                                                  [---]
</TABLE>

[---] = [---]

      = [---] PER GALLON

C.  PRODUCT PRICE COMPUTATION FOR [---] DELIVERY OF NO. 2 DIESEL FUEL
    PURCHASED BY MECO AND HELCO TO BUYER'S NOMINATED MARINE TERMINAL AT
    KAUNAKAKAI, MOLOKAI, KAHULUI, MAUI, HILO, HAWAII OR KAWAIHAE HAWAII HAVING A
    STANDARD BTU CONTENT OF [---]

1.  For MECO-Molokai/Delivered Kaunakakai:

          [---]

Where PD2 is equal to the price per physical gallon for the Month of Delivery
for No. 2 Diesel purchased by MECO-Molokai, Delivered to Kaunakakai, in
$/gallon.

Assume [---] value applies, thus

[---]

[---]

     [---]

                                       38
<PAGE>
 
where TD2 = sum of

<TABLE>
     <S>                                                  <C>
     HGET = 4.166% of Diesel Index +[---] =               [---]
     [---]
     [---] =                                              [---]
     Hawaii Environmental Response Tax =                  $0.0012/gallon
     Hawaii Liquid Fuel Tax =                             $0.0100/gallon
                                                          --------------
                                                          [---]
</TABLE>

[---] = [---]

      = [---] PER GALLON

2.   For MECO/Delivered Kahului:

          [---]

Where PD3 is equal to the price per physical gallon for the Month of Delivery
for No. 2 Diesel purchased by MECO-Maui, Delivered to Kahului, Maui, in
$/gallon,

Assume [---]value applies, thus

[---] = [---]

[---] = [---]

      = [---]

where TD3 = sum of

<TABLE>
     <S>                                                          <C>
     HGET = 4.166% of Diesel Index [---] = 0.04166*[---] =        [---]
     [---] =                                                      [---]
     Hawaii Environmental Response Tax =                          $0.0012/gallon
     Hawaii Liquid Fuel Tax =                                     $0.0100/gallon
                                                                  --------------
                                                                  [---]
</TABLE>

[---] = [---]

      = [---] PER GALLON

3.  For HELCO/Delivered Hilo:

          [---]

Where PD4 is equal to the price per physical gallon for the Month of Delivery
for No. 2 Diesel purchased by HELCO-Hawaii, Delivered to Hilo Hawaii, in
$/gallon.

Assume [---] value applies, thus

                                       39
<PAGE>
 
[---] = [---]

[---] = [---]

      = [---]

where TD4 = sum of

<TABLE>
     <S>                                                  <C>
     HGET = 4.166% of Diesel Index [---] =                [---]
     [---] =                                              [---]
     Hawaii Environmental Response Tax =                  $0.0012/gallon
     Hawaii Liquid Fuel Tax =                             $0.0100/gallon
                                                          --------------
                                                          [---]
</TABLE>

[---] = [---]

      = [---] PER GALLON

4.   For HELCO/Delivered Kawaihae:

          [---]

Where PD5 is equal to the price per physical gallon for the Month of Delivery
for No. 2 Diesel purchased by HELCO-Hawaii, Delivered to Kawaihae Hawaii, in
$/gallon.

Assume [---] value applies, thus

[---] = [---]

[---] = [---]

      = [---]

where TD5 = sum of

<TABLE>
     <S>                                                  <C>
     HGET = 4.166% of Diesel Index [---] =                [---]
     [---] =                                              [---]
     Hawaii Environmental Response Tax =                  $0.0012/gallon
     Hawaii Liquid Fuel Tax =                             $0.0100/gallon
                                                          --------------
                                                          [---]
</TABLE>

[---] = [---]

      = [---] PER GALLON

                                       40
<PAGE>
 
D.  PRODUCT PRICE COMPUTATION FOR [---] DELIVERY OF NO. 2 DIESEL FUEL PURCHASED
    BY MECO AND HELCO TO BUYER'S NOMINATED MARINE TERMINAL AT KAUNAKAKAI, 
    MOLOKAI, KAHULUI, MAUI, HILO, HAWAII OR KAWAIHAE HAWAII HAVING A BTU 
    CONTENT OF OTHER THAN STANDARD

    Assume the weighted average BTU content per gallon of the representative
    samples of Diesel purchased by a respective Buyer during a calendar quarter
    [---].  The price charged for the Diesel sold and Delivered to that 
    respective Buyer during each Month of the calendar quarter in question 
    shall be adjusted by multiplying the Diesel price by the ratio of the 
    actual BTU content to a standard of [---].

For MECO-Molokai/Delivered Kaunakakai:

          [---]

Where PD2 is equal to the price per physical gallon for the Month of Delivery
for No. 2 Diesel purchased by MECO-Molokai, Delivered to Kaunakakai, in
$/gallon.

Assume [---] value applies, thus

[---] = [---]

[---] = [---]

      = [---]

      = [---]

where TD2 = sum of

<TABLE> 
     <S>                                                  <C>
     HGET = 4.166% of adjusted (Diesel Index [---] =      [---]
     [---] =                                              [---]
     Hawaii Environmental Response Tax =                  $0.0012/gallon
     Hawaii Liquid Fuel Tax =                             $0.0100/gallon
                                                          --------------
                                                          [---]
</TABLE>

[---] = [---]

      = [---] PER GALLON

Note on computation of other Diesel Delivered to Kahului, Hilo and Kawaihae:
- ----------------------------------------------------------------------------
Price per physical gallon for the Month of Delivery for No. 2 Diesel purchased
by MECO-Maui, Delivered to Kahului, HELCO-Hawaii, Delivered to Hilo, Hawaii and
by HELCO-Hawaii, Delivered to Kawaihae, Hawaii in $/gallon having a BTU content
other than standard would be determined in a manner logically consistent with
than computed above for MECO-Molokai.


CIFO

For MECO or HELCO FOB their respective Nominated Barge:

 

                                       41
<PAGE>
 
          [---]

Where PF is equal to the price per physical barrel for the Month of Delivery for
CIFO, in $/barrel.

I.  FI = the Index for CIFO which shall be the simple average of the low and
    high price assessments for Los Angeles Bunker C Fuel Oil as reported by
    Platt's Oilgram Bunkerwire ("Platt's Bunkerwire") for all dates of
    publication from the 21st Day of the second preceding Month to 20th Day of
    the Month preceding Delivery expressed in $/barrel

<TABLE>
<CAPTION>
    Date    Low     High    Average
    ----    ---     ----    ------- 
    <S>     <C>     <C>     <C>
    [---]   [---]   [---]   [---]
</TABLE>

AVERAGE [---] IN USD     [---] PER [---]

[---]

      = [---]
 
[---] = [---] PER BARREL


II. [---]

          Assume [---]per barrel premium values apply:

          [---]

                                       42
<PAGE>
 
Assume further that the barrel volume in the Delivery to be priced is [---],
thus

[---] = [---]


III.  TF = Taxes applicable to the sale of CIFO pursuant to Section 5.3 herein.

      Hawaii General Excise Tax = 4.166% of pre-HGET price
      [---]

      Taxes after application of HGET [---]:
      Hawaii Environmental Response Tax = $0.05 per barrel


E.   PRODUCT PRICE COMPUTATION FOR [---] DELIVERY OF CIFO PURCHASED BY MECO OR
     HELCO HAVING A STANDARD BTU CONTENT OF [---] BARREL

[---] = [---]

      = [---]

where TF = sum of

<TABLE>
     <S>                                                   <C>
     HGET = 4.166% of CIFO Index [---] =                   [---]
     [---] =                                               [---]
     Hawaii Environmental Response Tax =                   $0.050/barrel
                                                           -------------
                                                           [---]
</TABLE>

[---] = [---]

      = [---] PER BARREL

F.  PRODUCT PRICE COMPUTATION FOR [---] DELIVERY OF CIFO PURCHASED BY MECO OR
    HELCO HAVING OTHER THAN A STANDARD BTU CONTENT

    Assume the weighted average BTU content per barrel of the representative
    samples of CIFO purchased by a respective Buyer during a calendar quarter 
    [---].  The price charged for the CIFO sold and Delivered to that 
    respective Buyer during each Month of the calendar quarter in question 
    shall be adjusted by multiplying the CIFO price by the ratio of the actual 
    BTU content to a standard of [---].

[---] = [---]

      = [---]

      = [---]

where TF = sum of

                                       43
<PAGE>
 
<TABLE>
     <S>                                                        <C>
     HGET = 4.166% of adjusted (CIFO Index +[---] =             [---]
     [---] =                                                    [---]
     Hawaii Environmental Response Tax =                        $0.050/barrel
                                                                -------------
                                                                [---]
</TABLE>

[---] = [---]

      = [---] PER BARREL

Note on items as they appear on invoices
- ----------------------------------------
Actual invoices for sales and Deliveries of Diesel and CIFO may include
additional charges for Hawaii DOT/Harbors Div. wharfage fees applied when
Buyer's Nominated Barge is moored, all or in part, against or to State piers.

For billing purposes, certain taxes, such as the HGET [---], on the sale and
Delivery of Diesel may be consolidated with the corresponding tax charged on the
sale and Delivery of CIFO.

Actual invoices for sales and Deliveries of Diesel and CIFO may also contain
comments which reference the wharfage charge per unit, and volume of Diesel and
CIFO on which the wharfage fee is levied and the identifying number of the State
pier for which wharfage is being levied.


JET

For MECO or HELCO FOB MECO's or HELCO's respective power plant truck unloading
rack:.
their respective Nominated Barge:

                             PJ = JI + [---] + TJ

Where PJ is equal to the price per physical barrel for the Month of Delivery for
Jet, in $/gallon.

I.   JI = the Index for Jet which shall be the Friday simple average West Coast
     Spot Pipeline price for jet fuel in Los Angeles in the Month preceding
     Delivery, as reported by the Platt's Oilgram from the 21st of the second
     preceding Month to the 20th Day of the Month preceding Delivery.

<TABLE>
<CAPTION>
     Date            Low      High     Average
     ----          -------   -------   -------
     <S>            <C>       <C>       <C>
     08/22/97      $0.5850   $0.6025   $0.5938
     08/29/97      $0.5775   $0.5850   $0.5813
     09/05/97      $0.5750   $0.5875   $0.5813
     09/12/97      $0.5700   $0.5800   $0.5750
     09/19/97      $0.6025   $0.6150   $0.6088
</TABLE>

AVERAGE OF MEAN IN USD   $0.5880 PER GALLON

II.  TJ = Taxes applicable to the sale of Jet pursuant to Section 5.3 herein.

                                       44
<PAGE>
 
     Hawaii General Excise Tax = 4.166% of pre-HGET price
     [---]

     Taxes after application of HGET[---]:
     Hawaii Environmental Response Tax  =  $0.05 per barrel, $0.0012 per gallon


G.   PRODUCT PRICE COMPUTATION FOR DELIVERY OF JET PURCHASED BY MECO OR HELCO

PJ = $0.5880 + [---] + TJ

   = [---] + TJ

where TJ = sum of

<TABLE>
     <S>                                                          <C>
     HGET = 4.166% of Jet Index [---] = 0.04166* [---] =          [---]
     [---] =                                                      [---]
     Hawaii Environmental Response Tax =                          $0.0012/gallon
                                                                  --------------
                                                                  [---]
</TABLE>

[---] = [---]

      = [---] PER GALLON

                                       45
<PAGE>
 
                                 ADDENDUM NO. 2

                        QUALITY CONTROL SAMPLES SUMMARY
                        -------------------------------
<TABLE>
<CAPTION>
                                                                                          ----------------------------------
                                                 FREQUENCY                                APPLICATION   CONTRACT   SELECTION
                                              --------------                              ----------------------------------
                                        TAKING THE       SAMPLE          METHOD &         SAMPLE        SAMPLE     ACTION ON
TYPE                     LABEL          SAMPLE           ANALYSIS        LOCATION         TAKING        ANALYSIS   FAILURE
- ----                     -----          --------------   -------------   --------------   -----------   --------   ---------
<S>                      <C>            <C>              <C>             <C>              <C>           <C>        <C>
1. Refinery Production   ---            After Each       After Each      Composite        N/A           N/A        N/A
                                        Tank Receipt     Receipt         from Refinery
                                                                         Tank
2. HMT Inventory         ---            After Each       After Each      Composite        N/A           N/A        N/A
                                        Tank Receipt     Receipt         from HMT Tank
3. Delivered             A. Buyer's     During Each      Only If         Drip From        7.1           7.2        7.3
                         Sample         Barge            Necessary       Loading Line
                                        Loading or                       at HMT or
                         B. Chevron's   Monthly                          Composite
                         Sample                                          from [---]

                         C. Buyer's
                         Retain

4. Loaded                A. Chevron's   After Each       A. After        Composite        6.1iii        11.3i      11.3I &
                         Sample         Barge Loading    Each Loading    From Barge                                11.3ii
                                                         B. Only If      Tanks at HMT
                                                         Necessary
                         B. Buyer's
                         Retain

5. Loaded (Third-Party)  A. Buyer's     After Each       A. After        Composite        11.1ii        11.3I      11.3I &
                         Sample         Barge Loading    Each Loading    from Barge                                11.3ii
                                        of               B.( Only If     Tanks at
                                        Third-Party      Necessary       Third-Party
                         B. Chevron's   Oil                              Supplier's
                         Sample                                          Dock

                         C. Buyer's
                         Retain

6. Received              A. Prompt      Before Each      A. Before       Composite        A. 11.6i      11.6ii     11.6iv
                                        Barge            Each Loading    from Barge
                         B. Buyer's     Unloading        B.,C.,D.        Tanks at Hilo    B. 11.6Ii     11.6iii    11.6iv
                         Sample         Whether          (Only if        or Kahului
                                        Buyer's or       Necessary)      Harbor
                                        Chevron's
                         C. Chevron's
                         Sample

                         D. Buyer's
                         Retain

7. Returned              A. Prompt      After Each       A. Before       Composite        A. 11.3i      11.13I     11.13iii
                                        Barge            Each Loading    from
                         B. Buyer's                      B.,C.,D.        Chevron's        B. 11.3i      11.13ii    11.13iii
                         Sample         Unloading        (Only if        Tanks at Hilo
                                        Whether          Necessary       or Kahului
                                        Buyer's or                       Terminals
                         C. Chevron's   Chevron's
                         Sample
                         D. Buyer's
                         Retain
</TABLE>

                                       46
<PAGE>
 
                    ADDENDUM NO. 2 - QUALITY CONTROL SAMPLES

                        SCHEMATIC Part 1 of 2  (diagram)

                                       47
<PAGE>
 
                    ADDENDUM NO. 2 - QUALITY CONTROL SAMPLES

                        SCHEMATIC Part 2 of 2  (diagram)

                                       48
<PAGE>
 
                                 ADDENDUM NO. 3

                                     [---]

SECTION 1
- ---------

[---] (also referred to herein as the [---]). The provisions of [---] shall only
apply to the [---] as described herein and shall [---]. If and whenever said 
[---] for the use of [---] and for the [---] provided:

1.   Chevron shall have the right to review the quality of [---]; and

2.   Buyer shall permit Chevron, its employees and agents (including but not 
     limited to affiliates and contractors and their employees) to enter upon 
     and inspect Buyer's Barbers Point Storage Facilities immediately prior to,
     during and immediately after [---] upon reasonable advance notice to Buyer
     and provided that such entry and inspection shall not interfere with
     operation of Buyer's Barbers Point Storage Facilities.

3.   Buyer shall operate the [---] in a safe manner, in compliance with all
     applicable laws and regulations, and in accordance with good engineering 
     and operating practices ("GEOPS") and in accordance with generally accepted
     industry practices.

4.   Buyer's use of the [---] during any Year of this Contract, if and 
     whenever said [---] are completed, shall be [---]


SECTION 2
- ---------

[---] need to be constructed in the location where [---] physically intersect
and connect with the [---], which shall be taken to be at the[---].  Provided
further:

a.   [---] shall be responsible for the design, engineering and construction and
     shall bear the costs arising therefrom of the [---] shall have the right to
     approve in advance, [---] designs, engineering and construction standards,
     provided, however,  that such approval shall not be unreasonably withheld

b.   [---], may, at its option, engage third-party consultants or contractors to
     perform the design, engineering and construction of the [---], provided 
     that [---] selection of such consultants and contractors shall be subject 
     to [---] approval, provided, however, that such approval shall not be 
     unreasonably withheld.

                                       49
<PAGE>
 
c.   The design and engineering plans (the "Plans") for the [---] shall be 
     developed in accordance with all applicable laws and regulations and GEOPS.
     [---] shall have twenty (20) working days following its receipt of the
     Plans ("20-day Period") to review the Plans and submit written comments to
     [---]. Should [---] fail to provide written notice to [---] of its
     approval, conditional approval or disapproval of the Plans prior to the end
     of said 20-day Period, [---] shall be deemed to have approved the Plans.

d.   [---] shall permit [---] to inspect the construction of the [---] at all
     times during normal business hours and upon reasonable advance notice. [---
     ] shall perform all construction work in compliance with all applicable
     laws and regulations.

e.   Following the completion of the construction of the [---] shall transfer 
     to [---] all of [---] rights, title and interest in and to the [---] which
     shall then be a part of the [---]. On and after such date and time of
     transfer, [---] shall own, operate and maintain the tee branch connection
     and other components of the [---]. Subject to the prior approval of [---],
     which shall not be unreasonably withheld, [---] shall schedule and perform
     such routine maintenance on the [---] as shall be required to by applicable
     laws, regulations, general industry practices and GEOPS. [---] shall
     reimburse [---] for its reasonable documented out of pocket costs and
     expenses incurred solely as a result of such routine maintenance.


SECTION 3
- ---------

Whenever [---] operates the [---], it shall do so at all times in a safe,
effective and efficient manner, in compliance with all applicable laws and
regulations, in a reasonable and prudent manner and in conformance with
generally accepted industry practices and GEOPS.

[---] operating standards and instructions shall be available for [---]
inspection at [---].


SECTION 4
- ---------

Consent of [---] shall not be required for routine maintenance of the [---],
provided, however, [---] shall be required to advise [---] regarding the
potential impact on shipments of [---] caused by any maintenance procedures or
improvements which are not routine or minor in nature and which are not urgent
and necessary to maintain the [---] in good order. Such maintenance shall be
performed by [---] as may be required from time to time.

[---] shall maintain accurate and complete records of maintenance performed and
shall provide same and any other relevant supporting information as [---] may
reasonably require.


SECTION 5
- ---------

If subsequent to [---], additions or modifications to any part of the [---] are
reasonably required in the mutual opinion of [---] and [---] solely in order to
accommodate [---] use, such modifications shall be designed, engineered and
constructed in accordance with the provisions of Section 2 herein.  All rights,
title and interest in the addition or modification shall rest with [---] who
shall own, operate and maintain such addition or modification in accordance with
the provisions herein including but not limited to Sections 2, 3 and 4. [---]
shall reimburse [---] for its reasonable costs and expenses incurred pursuant to
the installation and maintenance of  the addition or modification upon
presentation of invoices or other suitable documentation in accordance with
Section 2 and Section 11 herein.

                                       50
<PAGE>
 
SECTION 6
- ---------

[---] will mutually coordinate the shipment of [---] through the [---].
Shipment scheduling shall be flexible to ensure that [---] shipments are not
unreasonably interrupted.  To assist in the coordination of shipments:

1.   [---] shall provide [---] a forecast of intended shipments of [---] 
     through the [---] ten Days prior to the beginning of any Month for the [---
     ]. The forecast for the [---] shall define on a [---] basis the nature and
     volume of shipments. The forecast for the [---] shall specify the total
     volume of shipments for [---].

2.   With respect to each individual shipment of [---] though the [---] shall 
     provide [---] a proposed 3-Day shipment period or window upon no less than
     ten (10) Days' notice prior to the first Day of the proposed shipment
     period ("10-Day Notice"). The 10-Day Notice shall also specify the amount
     of [---] to be shipped, subject to a variation of plus or minus twenty (20)
     percent with respect to the actual volume shipped. [---] may reject the
     proposed shipment period upon providing [---] notice, no later than one (1)
     business day from the receipt of [---] 10-Day Notice, of an alternate 3-Day
     shipment period where the date of the first Day of such alternate 3-Day
     period is within one (1) Day of the date of the first Day of [---] first
     proposed 3-Day shipment period. Subsequent to the agreement by the parties
     on the shipment period contained in the 10-Day Notice, [---] shall make
     reasonable best efforts to adjust the shipment period to accommodate the
     priority berthing of [---] at the [---]. Should [---] reasonably estimate
     that the duration of shipment operations will be less than 3 Days, the
     agreed 3-Day shipment period is to be narrowed by [---] to two (2) Days
     upon no less than five (5) Days' notice prior to the first Day of the 2-Day
     shipment period. Similarly, should [---] reasonably estimate that the
     duration of shipment operations will be less than 2 Days, the 2-Day
     shipment period is to be narrowed by [---] to one (1) Day upon no less than
     two (2) Days' notice prior to the date and time of commencement of shipment
     operations. Notices may be given by electronic mail, facsimile, radio or
     telephone.

3.   Notwithstanding the estimated duration of shipment operations, the 
     estimated date and time of the commencement of shipment operations shall be
     narrowed to 12 hours by mutual consent of [---] and [---] no later than two
     (2) Days prior to the estimated shipment commencement time and date

4.   When [---] is ready to load or discharge, the master of said vessel shall
     provide [---] notice of readiness ("NOR"), and laytime shall commence six
     (6) hours after receipt of the NOR, or upon [---] arrival in berth (all
     fast), whichever first occurs. [---] shall be allowed laytime for loading
     or discharging [---] on the basis of the shipment volume in barrels divided
     by a pumping rate standard of [---] barrels per hour. Demurrage shall be
     payable to [---] against [---] invoice, supported by such data as may be
     reasonably requested, at a rate equal to [---] actual demurrage rate per
     hour for each hour used and prorated for each portion of an hour used in
     excess of allowable laytime and for all delays caused by [---] subsequent
     to six (6) hours after NOR is effective and prior to the time [---] is
     advised that a berth is available for the vessel except if such delay is
     caused by any event or acts beyond the reasonable control of [---],
     including but not limited to acts of God, fire, governmental acts or labor
     disturbances.

5.   [---] shall vacate the berth at [---] when cargo operations are completed. 
     [---] shall be responsible for any actual loss or damage incurred by [---]
     as a direct result of the failure of [---] to promptly vacate the berth
     except if such delay is caused by any event or acts beyond the reasonable
     control of [---], including but not limited to acts of God, fire,
     governmental acts or labor disturbances. In no event shall either party be
     responsible for loss of prospective profits, or consequential damages
     allegedly caused by or based upon failure of [---] to promptly vacate the
     berth.

                                       51
<PAGE>
 
SECTION 7
- ---------

The quantity of each shipment of  [---] shall be determined by an Independent
Inspector in accordance with Article VIII.  The Independent Inspector or [---]
shall provide [---] with summary documentation of [---] shipments describing the
volumes and dates of such shipments through the [---].


SECTION 8
- ---------

Title to [---] transported through the [---] for [---] account shall at all
times remain with [---].


SECTION 9
- ---------

If for operational reasons it is necessary for [---] to deliver line
displacement stock to [---], such line displacement stock shall be the least
expensive grade or type available which is suitable for the purpose and the line
displacement stock shall be of such quality specification that neither causes
operational problems to [---] nor results in the contamination of [---] such
that [---] fail to comply with the  specification limits with which they would
have otherwise been in compliance. If time permits, [---] shall have the right
to approve in advance the suitability of such pipeline displacement stock,
provided that such approval shall not be unreasonably withheld. [---] shall
purchase such stock from [---] in accordance with the prices set forth in
Article 5.  The quantity of line displacement stock delivered to [---] shall be
determined by the Independent Inspector in accordance with Article VIII.

To the extent that small portions of [---] shipped through the [---] are
delivered to [---] in the course of acting as an interface between [---]
petroleum products in that portion of the [---] not used to ship [---] shall
credit [---] for such transferred petroleum products at the prices set forth in
Article V. The quantity of such transferred petroleum products shall be
determined by the Independent Inspector in accordance with Article VIII.


SECTION 10
- ----------

In consideration for its use of the [---] and for performing line displacement
operations for [---] both before and after   [---] use of the [---] shall pay to
[---] a throughput charge ("Throughput") on each shipment of [---] transferred
through the [---].

The Throughput shall be calculated by multiplying the number of physical barrels
of [---] shipped through the [---] as determined by the Independent Inspector
and the transport charge per physical barrel ("Rate").  The number of physical
barrels of [---] shipped shall be determined pursuant to Article 8.

The base Rate shall be [---] per barrel. [---].  Escalation factor A ("FA"),
escalation factor B ("FB") and escalation factor C ("FC") are defined as
follows:

     (i)    A labor adjustment factor An which is defined as the arithmetic 
            average of the hourly earnings in dollars per hour for the petroleum
            and coal products industry as shown in the "Employment and Earnings"
            publication of the U.S. Department of Labor, Bureau of Labor
            Statistics, for the three Months of the second calendar quarter
            immediately preceding the calendar quarter of the Month in which
            services are rendered, divided by (19.76).

                                       52
<PAGE>
 
     (ii)   An industrial commodities adjustment factor Bn which is defined as 
            the arithmetic average of the Producer Price Index for Industrial
            Commodities as published by the U.S. Department of Labor, Bureau of
            Labor Statistics, for the three Months of the second calendar
            quarter immediately preceding the calendar quarter of the Month in
            which services are rendered, divided by (128.0).

     (iii)  A fuels and power adjustment factor Cn which is defined as the
            arithmetic average of the Producer Price Index for Fuels and Power
            (Code 5), as published by the U.S. Department of Labor, Bureau of
            Labor Statistics, for the three Months of the second calendar
            quarter immediately preceding the calendar quarter of the Month in
            which services are rendered, divided by (88.9).

[---] shall employ and also be responsible for costs of any support vessels,
pilots, mooring masters, or line handlers supplied by [---] or otherwise
required by [---], all of which shall become borrowed servants of [---].  Dues
and other charges on [---] (whether or not such dues or charges are based on the
quantity of [---] loaded or discharged or on the freight and without regard from
whom such dues or charges are withheld) shall be paid by [---].  Any taxes on
freight shall be borne by [---] shall be responsible for any State fee imposed
for its use of the [---] in the nature of wharfage or pipeline toll.


SECTION 11
- ----------

[---] shall issue invoices for Throughput or for reimbursement for additions or
modifications in the Month following the Month in which the services or costs
and expenses are incurred. [---] will pay on these invoices in accordance with
Article IX.


SECTION 12
- ----------

[---] shall each indemnify, defend and hold harmless the other party pursuant to
Article XVIII herein.


SECTION 13
- ----------

In the event an escape or discharge of [---] occurs from [---], the
responsibilities of the respective parties shall be as per Article XXII herein.


SECTION 14
- ----------

[---] shall comply with all applicable provisions of Article XX and XXI of this
Contract, including but not limited to compliance with regulations, compliance
with [---] vessel acceptance standards, compliance with [---] Operations Manual,
pollution mitigation, required insurance, liability for dues and other charges
on said vessel.


SECTION 15
- ----------

Nothing herein shall be construed as a dedication of the [---] to public use
pursuant to Section 19.3 of this Contract.

                                       53
<PAGE>
 
SECTION 16
- ----------

Neither [---] nor [---] shall commit or suffer to be committed any act or
default whereby the rights and interests of either party in and under right of
entry or easements shall be jeopardized.

                                       54

<PAGE>
 
                                                              HECO Exhibit 10.10
                                                              ------------------
                                                                                



                       FACILITIES AND OPERATING CONTRACT


                                 by and between


                           CHEVRON PRODUCTS COMPANY,
                        A DIVISION OF CHEVRON U.S.A. INC

                                      and


                        HAWAIIAN ELECTRIC COMPANY, INC.



                             * * * * * * * * * * *
<PAGE>
 
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
ARTICLE                                                                                 Page 
                                                                                                   
<S>                                                                                       <C>      
ARTICLE 1:  Definitions..............................................................     1        
ARTICLE 2:  Term of Contract.........................................................     5        
ARTICLE 3:  Transportation of LSFO to Kahe, Waiau, and Iwilei........................     5        
  Section 3.1:    Pipelines..........................................................     5        
  Section 3.2A:   Transport of LSFO..................................................     5        
  Section 3.2.B:  Operation and Maintenance of Pipelines.............................     5        
  Section 3.2.C:  Maximum Viscosity..................................................     6        
  Section 3.3:    Compensation.......................................................     6        
     Section 3.3.A:  Facility Charge.................................................     6        
     Section 3.3.B:  Throughput Charges..............................................     6        
     Section 3.3.C:  Maintenance Charge..............................................     7        
     Section 3.3.D:  Invoices and Payment............................................     9        
     Section 3.3.E:  Pipeline Site Remediation.......................................    10        
     Section 3.3.F:  Discontinued Operation of Honolulu Generating Plant.............    10        
  Section 3.4:  Modification, Relocation, and Replacement of Facilities..............    11        
  Section 3.5:  LSFO Movement Coordination and Reporting.............................    12        
     Section 3.5.A:  Coordination....................................................    12        
     Section 3.5.B:  Reporting.......................................................    12        
  Section 3.6:  Title and Risk of Loss...............................................    13        
  Section 3.7:  Chevron's Operating and Maintenance Offset...........................    13        
  Section 3.8:  Review of Operating and Maintenance Procedures.......................    14        
ARTICLE 3A:     Budgeting............................................................    14        
ARTICLE 4:   HECO'S Use of Chevron's Tanker Mooring Facilities                                     
             and Submarine Lines.....................................................    15        
  Section 4.1:  Use of Chevron's Facilities..........................................    15        
  Section 4.2:  Compensation.........................................................    17        
     Section 4.2.A:  Compensation for LSFO Received..................................    17        
     Section 4.2.B:  Compensation for Line Displacement Stock........................    17        
     Section 4.2.C:  Credit for Cargo Used as Line Displacement Stock................    17        
     Section 4.2.D:  Clean Island Council............................................    18        
  Section 4.3:  LSFO Movement Coordination and Reporting.............................    18          
     Section 4.3.A:  Notification of Estimated Vessel Arrival........................    18        
     Section 4.3.B:  Notice of Readiness.............................................    18         
</TABLE>
<PAGE>
 
<TABLE>
     <S>                                                                                <C>
     Section 4.3.C:  Berth Time......................................................   19       
     Section 4.3.D:  Demurrage.......................................................   19       
     Section 4.3.E:  Vessel Berth....................................................   20       
     Section 4.3.F:  Other Marine Provisions.........................................   21       
     Section 4.3.G:  Reporting.......................................................   21       
  Section 4.4:  Title and Risk of Loss...............................................   21       
  Section 4.5:  Oil Pollution Insurance..............................................   22       
  Section 4.6:  Site Remediation.....................................................   22       
ARTICLE 5:  Operation and Maintenance of HECO's BPTF.................................   23       
  Section 5.1:  Tank Field Facilities and Service....................................   23       
     Section 5.1.A:  Tank Field Facilities...........................................   23       
     Section 5.1.B:  Services........................................................   23       
     Section 5.1.C:  Tank Field Facility Additions and Modifications.................   24       
     Section 5.1.D:  Additional Services.............................................   25       
  Section 5.2:  Compensation.........................................................   25       
     Section 5.2.A:  Base Compensation...............................................   25       
     Section 5.2.B:  Determination of Fees for Additional Operation and                          
                     Maintenance.....................................................   27       
     Section 5.2.C:  Invoices and Payment............................................   27       
     Section 5.2.D:  Chevron's Operating and Maintenance Offset......................   27       
  Section 5.3:  Reports..............................................................   28       
  Section 5.4:  Title and Risk of Loss...............................................   28       
  Section 5.5:  Insurance............................................................   28       
  Section 5.6:  Barbers Point Site Remediation.......................................   29       
ARTICLE 6:  Waiau - Barbers Point Steam Exchange.....................................   30       
  Section 6.1:  Facilities...........................................................   30       
  Section 6.2:  Services.............................................................   30       
  Section 6.3:  Measurement of Chevron's Steam Consumption...........................   31       
     Section 6.3.A:  Steam Flow Meter Operable.......................................   31       
     Section 6.3.B:  Steam Flow Meter Inoperable.....................................   31       
  Section 6.4:  Compensation.........................................................   31       
ARTICLE 7:  Measurement of Quantity and Quality......................................   32       
  Section 7.1:  Measurement of Quantity..............................................   32       
  Section 7.2:  Determination of Quality.............................................   32       
  Section 7.3:  Disputes of Quality and Quantity.....................................   33       
ARTICLE 8:  Line Displacement Stock and Line Warm Up Stock...........................   33       
ARTICLE 9:  Invoicing and Payment....................................................   33       
  Section 9.1:  Invoices.............................................................   33       
  Section 9.2:  Payments.............................................................   34       
  Section 9.3:  Method of Payment....................................................   34       
ARTICLE 10:  Audits..................................................................   35        
</TABLE> 
<PAGE>
 
<TABLE> 

  <S>                                                                                  <C> 
  Section 10.1:  Audits Requiring Non-Confidential Information.......................  35        
  Section 10.2:  Audits Requiring Confidential Information...........................  35        
  Section 10.3:  Independent Audits Using Non-Confidential Information...............  35        
  Section 10.4:  Adjustments From Audit Findings.....................................  35        
ARTICLE 11:  Contingencies...........................................................  35        
  Section 11.1:  Definition of Contingency...........................................  35        
  Section 11.2:  Relief of Obligations...............................................  36        
  Section 11.3:  Pricing Affected by Government Direction............................  36        
  Section 11.4:  Event of Sale or Cessation of Chevron's Operations..................  37        
  Section 11.5:  Event of Sale or Cessation of HECO's Operations.....................  37        
ARTICLE 12:  Effect of Suspension or Reduction.......................................  37        
  Section 12.1:  Notice of Suspension or Reduction...................................  37        
  Section 12.2:  Chevron's and HECO's Rights during Suspension or Reduction            38        
  Section 12.3:  Termination Rights..................................................  38        
  Section 12.4:  Payment for Services and Facility Usage Provided....................  38        
ARTICLE 13:  Waiver and Non-Assignability............................................  38        
  Section 13.1:  Waiver..............................................................  38        
  Section 13.2:  Non-Assignability...................................................  38        
  Section 13.3:  Definitions.........................................................  39        
ARTICLE 14:  Default.................................................................  39        
  Section 14.1:  Default.............................................................  39        
  Section 14.2:  Termination Rights..................................................  39        
ARTICLE 15:  Conflict of Interest....................................................  39        
ARTICLE 16:  Applicable Law..........................................................  40        
ARTICLE 17:  Indemnity...............................................................  40        
  Section 17.1  HECO indemnifies Chevron.............................................  40        
  Section 17.2  Chevron indemnifies HECO.............................................  40        
  Section 17.3  Provision survival...................................................  42        
ARTICLE 18:  Public Utility Commission...............................................  42        
  Section 18.1:  Approval............................................................  42         
</TABLE>
<PAGE>
 
<TABLE>
<S>                                                                                            <C>
     Section 18.2:  Use as a Public Utility..........................................          42
ARTICLE 19:  Miscellaneous...........................................................          42
  Section 19.1:  Headings............................................................          42
  Section 19.2:  Entire Agreement....................................................          42
  Section 19.3:  Contract is Not an Asset............................................          43
  Section 19.4:  Notices.............................................................          43
  Section 19.5:  Severability........................................................          43
  Section 19.6:  Successors and Assigns..............................................          43
  Section 19.7:  Consequential Damages...............................................          43
  Section 19.8:  Termination of Prior Agreement......................................          44

Signature page                                                                                 44

ADDENDUM 1:  Adjustment Factors for Adjustable Charges and Fees                                45
 
ADDENDUM 2:  Quality                                                                           46
 
ADDENDUM 3:  Chevron's Mooring and Submarine Lines                                             47
 
ADDENDUM 4:  Chevron Products Co Marine Terminal Manual for Barber's                           48
             Point Offshore Tanker terminal
 
ADDENDUM 5:  List of Facilities in HECO's BPTF System and Chevron's                            49
             Tank Field Support System
 
ADDENDUM 6:  List of Facilities in HECO's Waiau Steam System                                   51
 
APPENDIX 1:  Chevron's and HECO's Fuel Oil Distribution Systems                                52
 
APPENDIX 2:  Summary of Vessel Requirements at Barbers Point                                   53
 
APPENDIX 3:  Refinery Operating Standards and Instructions                                     56
</TABLE>
<PAGE>
 
                       FACILITIES AND OPERATING CONTRACT
                       ---------------------------------


  THIS CONTRACT is dated as of November 14, 1997, by and between CHEVRON
PRODUCTS COMPANY, A DIVISION OF CHEVRON U.S.A. INC., a Pennsylvania corporation,
("Chevron") and HAWAIIAN ELECTRIC COMPANY, INC., a Hawaii corporation, ("HECO").

  WHEREAS, each party owns and operates certain distribution and storage
facilities, including pipelines and terminals, suitable for use in the delivery
of LSFO.

  WHEREAS, the parties desire to enter into this contract for the use of such
facilities.

  NOW THEREFORE, the parties agree as follows:


                             ARTICLE 1: Definitions

Except where otherwise indicated, the following definitions shall apply
throughout this contract:

<TABLE>
     <S> <C>      
     1   "Barge Harbor Lines" means a fuel oil distribution pipeline system which may be
         constructed at some future date by Chevron, which would connect the Refinery with
         piping manifolds located at the pier face of the Barbers Point Barge Harbor.
     2   "Black Oil Pipeline" means Chevron's pipeline that connects the Refinery to HMT, HECO'S
         power plant at Waiau and HECO'S Iwilei Tank Farm for use at its Honolulu power plant.
     3   "BPTF" means HECO'S Barbers Point Tank Farm which is adjacent to the Refinery.
     4   "Contract" means this Facilities and Operating Contract, between Chevron and HECO, the
         term of which commences January 1, 1998.
     5   "Day" means a calendar day
     6   "Effective Date" means, for the purposes of this agreement, January 1, 1998
     7   "Facility Charge" means a monthly facility charge on each  section of the Pipeline used
         by HECO, as set forth in Section 3.3A
     8   "Facility Charge Account" means the total accumulated charges owed to Chevron by HECO
         for Facility Charges as set forth in Section 3.3A.
     9   "HMT" means Chevron's Honolulu Marine Terminal
    10   "Independent Inspector" means a mutually agreed upon qualified 3rd party petroleum
</TABLE>

                                       1
<PAGE>
 
         inspector
<TABLE>
<CAPTION>
                                                
    <S>  <C> 
    11   "Line Displacement Stock" means any petroleum product needed by Chevron, for line
         displacement purposes, to facilitate the deliveries of LSFO to HECO'S power plants.
    12   "LSFO" means Low Sulfur Fuel Oil meeting specifications per Addendum 2.  (This includes
         both Chevron and third party LSFO purchased by HECO for use in its power plants at
         Waiau, Honolulu, and Kahe).
    13   "LSFO Supply Contract" means that certain separate agreement between Chevron and HECO
         of even date herewith, known as the Low Sulfur Fuel Oil Supply Contract
    14   "Maintenance Charge" means a monthly maintenance charge on each section of the pipeline
         used by HECO,as set forth in Section 3.3C.
    15   "Major Maintenance Year" - a Year during which Chevron schedules to perform major
         repair work on the Pipelines or HECO's BPTF such as major pipeline replacement work
         and/or performs major testing work
    16   "Marine Facilities" means Chevron's Barbers Point tanker mooring facilities and one of
         Chevron's submarine lines, as set forth in Section 4.1.
    17   "Non-Adjusting Capital Charge" means a monthly capital charge for the Kahe, Waiau, and
         Iwilei components of Pipelines and the modifications thereof as set forth in Section
         3.3.A
    18   [---] means the [---] in addition to the following:
         a)  [---]
         b)  [---]
         c)   [---]
         d)  [---]
                 1.  [---]     *** PAGE BREAK HERE ***
                 2.  [---]
         e)  [---]
         f)  [---]
         g)  [---]
         h)  [---]
</TABLE>

                                       2
<PAGE>
 
<TABLE>

    <S>  <C> 
    19   "Non-Major Maintenance Year" - a Year that is not a Major Maintenance Year.
    20   "Physical Barrel" means 42 American bulk gallons at 60 degrees F.
    21   "Pipelines" means Chevron's and HECO's pipelines as described
         in Section 3.1.
    22   "Reasonable Costs" means, as to any expenditure under this Contract for services,
         materials or other items, an amount of money Chevron would be willing to pay, for its
         own account, for a similar service, material, or item under similar conditions and
         circumstances in Hawaii.
    23   "Refinery" means Chevron's Refinery at Barbers Point, HI.
    24   "Regulated Environmental Material" means any material for which HECO assumes risk of
         loss pursuant to Section 3.6, 4.4, and 5.4 released in connection with the provision of
         services and use of facilities in this Contract during the term of this Contract and
         discovered during the performance of any Site Remediation that, because of its
         quantity, concentration or physical or chemical characteristics, is regulated under
         Federal and/or state laws and regulations due to its actual or potential threat to
         human health and safety or to the environment if released into the workplace or the
         environment
    25   "Site Remediation" means the cleanup or removal of released Regulated Environmental
         Material from the environment, such actions as may be necessary in the event of the
         threat of release of Regulated Environmental Material into the environment, such
         actions as may be necessary to monitor, assess, and evaluate the release or threat of
         release of Regulated Environmental Material, the disposal of removed material, or the
         taking of such other actions as may be necessary to prevent, minimize, or mitigate
         damage to the public health or welfare or to the environment.
</TABLE>

                                       3
<PAGE>
 
<TABLE>

    <S>  <C> 
    26   "Site Remediation Costs" means the Reasonable Costs directly related to Site
         Remediation which Chevron incurs. These may include:
         3RD Party Oil Spill response and clean up providers
         Containment equipment and materials (purchased and leased)
         Clean Island Council / Marine Spill Response Corp consulting, services and support
         Navy (shipyard, public works) restricted access area clean up
         Coast Guard support
         Advertisements (claim related)
         Insurance services
         Damage claim payments
         Land leases
         Environmental consultants
         Security services
         Landscaping services
         Travel / per diem / food and refreshments
         Employee Overtime
         Freight costs
         Government penalties
         Fuel costs
         Sampling and Testing Services
         Transportation services (air and water)
         Safety support (such as ambulance standby)
         Public Relations Consulting (provided that the Public Relations Consulting costs are
         agreed upon by both parties)
    27   "Tank Field Support Systems" means the systems owned by Chevron as set forth in Section
         5.1.A.
    28   "Throughput Charge" means a monthly throughput charge for the
         transport of LSFO, Warm Up Stock, or Line Displacement Stock , as set forth in Section
         3.3B.
    29   "Transport Charge" means a monthly charge for transporting LSFO, Displacement Stock,
         and Warm Up Stock as set forth in Section 3.3.B.
    30   "User Percentage" means the ratio calculated pursuant to Section 3.3C(v).
    31   "Warm Up Stock" means any petroleum product used by Chevron to preheat any pipeline
         before an LSFO delivery to HECO's power plants and also used to flush the LSFO from the
         pipelines into Chevron storage tanks at the Refinery and HMT both before and after
         deliveries of LSFO to HECO's power plants.
    32   "Year" means a calendar year.
</TABLE>
 

                                       4
<PAGE>
 
                          ARTICLE 2: Term of Contract

The term of this Contract shall be from January 1, 1998 (the "Effective Date"),
through [---] and shall continue thereafter for additional 12-month periods
(each such 12-month period being an "Extension") beginning each successive
January 1, unless HECO or Chevron gives written notice of termination at least
120 days before the beginning of an Extension.


          ARTICLE 3: Transportation of LSFO to Kahe, Waiau, and Iwilei

Section 3.1: Pipelines

Chevron owns a fuel oil distribution pipeline system ("Black Oil Pipeline")
which connects the Refinery to HMT and to HECO's tank fields  at Waiau and
Iwilei.  HECO owns fuel oil pipeline systems which connect its BPTF and Kahe
plant to Chevron's fuel oil distribution pipeline system described above.
Together these fuel oil pipeline systems shall be referred to as "Pipelines" and
are shown schematically in Appendix 1.


Section 3.2A:  Transport of LSFO

Chevron and HECO agree that the LSFO  delivered by pipeline from Barbers Point
(either the Refinery or BPTF) into HECO's storage tanks at Kahe, Waiau and
Iwilei may be transported using the Pipelines.


Section 3.2.B: Operation and Maintenance of Pipelines

Chevron shall operate Pipelines in compliance with all applicable laws and
regulations and in accordance with Chevron's operating standards and
instructions, copies of which are available for HECO's inspection at the
Refinery. In carrying out its duties, Chevron shall exercise a similar degree of
skill and care that Chevron utilizes in the operation of its pipelines.
Applicable Chevron operating standards and instructions include, but are not
limited to, those  listed in Appendix 3.

Chevron shall, at a minimum, maintain Pipelines in compliance with all
applicable laws and regulations and in accordance with Chevron's Non-
discretionary Maintenance. In carrying out its duties, Chevron shall exercise a
similar degree of skill and care that Chevron utilizes in performing the Non-
discretionary Maintenance on its pipelines.

                                       5
<PAGE>
 
Section 3.2.C: Maximum Viscosity

The maximum LSFO viscosity for delivery to HECO's Waiau and Iwilei tank farms
shall be 200 SUS at 210 degrees Fahrenheit.


Section 3.3: Compensation

As compensation for the utilization, operation and maintenance of the Pipelines
to deliver HECO's or Chevron's LSFO to HECO's storage tanks at Kahe, Waiau and
Iwilei, HECO shall pay to Chevron monthly delivery fees which are comprised of a
Facility Charge, a Throughput Charge and a Maintenance Charge described herein.


Section 3.3.A: Facility Charge

A monthly Facility Charge for each of the Pipelines consists of the components
as shown in the following table:

<TABLE>
<CAPTION>
                                  Adjustable Overhead                  Non-Adjusting Capital
                                  and Operating Labor                  Charge
                                  Charges
                                  --------------------                 -----------------------
<S>                              <C>                                   <C>
                 Kahe                            [---]                                   [---]
                 Waiau                           [---]                                   [---]
                 Iwilei                          [---]                                   [---]
                 Total                           [---]                                   [---]
</TABLE>

The Overhead and Operating Labor Charges shall be adjusted quarterly beginning
January 1, 1998, in accordance with a factor ("An") based on the hourly earnings
for the petroleum and coal products industry, described in Addendum 1 attached.

The Non-Adjusting Capital Charge may be increased from time to time by separate
agreement to compensate for modifications to these lines subsequent to the
Effective Date of this Contract, as referenced in Section 3.4.


Section 3.3.B: Throughput Charges

An LSFO Throughput Charge is calculated by multiplying the number of Physical
Barrels of LSFO transported to each of the generating plant tank fields by the
respective Transport Charge per Physical Barrel of LSFO transported to that tank
field.  The base Transport Charges per Physical Barrel of LSFO are:

                                       6
<PAGE>
 
     [---]
     [---] and
     [---]

These per barrel base transport charges shall be adjusted quarterly beginning
January 1, 1998, in accordance with a factor ("Cn") based on a Producer Price
Index for Fuels and Power, described in Addendum 1, which is attached.  The
number of Physical Barrels of LSFO transported shall be determined pursuant to
Section 7.1.

A Warm Up Stock Throughput Charge is calculated by multiplying the number of
Physical Barrels of Warm Up Stock used in the movement of LSFO to HECO's three
generating plants by the respective Transport Charge per Physical Barrel of Warm
up Stock used in the movement of LSFO to that generating plant.

A Line Displacement Stock Throughput Charge is calculated by multiplying the
number of Physical Barrels of Line Displacement Stock used in the movement of
LSFO to the three generating plants by the respective Transport Charge per
Physical Barrel of Line Displacement Stock used in the movement of LSFO to that
generating plant; provided, however, notwithstanding anything else in this
Section 3.3.B, there shall be no Throughput Charge for the Line Displacement
Stock for movements from Chevron's HMT to the Refinery.

The volume of Line Displacement Stock and Warm Up Stock used shall be the
minimum amount necessary, in accordance with typical Chevron operating
standards, to satisfactorily accomplish the task.  The base Transport Charges
per Physical Barrel of Warm Up Stock or Line Displacement Stock are:

     [---]
     [---]
     [---]
     [---] and
     [---]

These per barrel base Transport Charges shall be adjusted quarterly beginning
January 1, 1998, in accordance with a factor ("Cn") based on a Producer Price
Index for Fuels and Power, described in Addendum 1 attached.  The number of
Physical Barrels used in LSFO movements shall be determined pursuant to Section
7.1.


Section 3.3.C: Maintenance Charge

The maintenance performed on all Pipelines shall be in compliance with then-
current United States Department of Transportation regulations and periodic
internal inspections utilizing then-current pipeline technology.

A Maintenance Charge reflecting costs as incurred will be the sum of (i), (ii),
(iii) prorated according to (v) below and 100% of (iv):

                                       7
<PAGE>
 
     (i)  [---] Reasonable Costs for maintenance materials, except as provided
          for in (iv) below.  Material costs include all taxes paid on material
          purchased.
     (ii) [---] Reasonable Costs for labor which includes direct supervision and
          technical support, whether contract labor charges or Chevron's labor
          rate at equivalent Contractor's labor rate, which includes all
          overheads, benefits and burdens except as provided for in (iv) below.
          The term "Contractor" shall mean a mechanical contractor properly
          licensed in the State of Hawaii, which Contractor shall be experienced
          in the type of work to be done and shall be chosen at the sole
          discretion of Chevron.

     (iii)[---] Reasonable Costs for direct costs, including but not limited
          to such items as equipment usage charges (whether Contractor's or
          Chevron's at equivalent Contractor rates), permits and consulting fees
          except as provided for in (iv) below.

     (iv) Base monthly fees of [---] consisting of:
          [---] on the section of Chevron's Pipelines between BPTF and HECO's
          Waiau tank field,
          [---] on the section of Chevron's Pipelines between HECO's Waiau and
          Iwilei tank fields
          [---] on the section of Chevron's and HECO's Pipelines between BPTF
          and HECO's Kahe tank field; which reflect Chevron's total costs for
          maintenance of  pumping and heating stations.

     The fees shall be adjusted quarterly beginning January 1,1998, using the
     composite factor (0.7 An + 0.3 Bn), where "An" and "Bn" are described in
     Addendum 1 attached.

     (v)  HECO's share of the Maintenance Charges on each of the three sections
          of the Pipelines, pursuant to this Section 3.3.C will be calculated in
          accordance with the User Percentage.

The User Percentage is determined by dividing (a) a numerator consisting of the
total Physical Barrels of LSFO and Line Displacement Stock delivered to HECO,
and the total Physical Barrels of Line Displacement Stock and Warm Up Stock
(excluding that which is delivered to HECO) associated with LSFO movements
through that particular Pipeline section during the immediately preceding twelve
months by (b) a denominator consisting of the total Physical Barrels of all
petroleum products delivered through that particular Pipeline section into both
HECO's storage tanks and to and from Chevron's terminal facilities at Honolulu,
which includes all Line Displacement Stock and Warm Up Stock associated with
LSFO movements and with movements of other petroleum products during the
immediately preceding 12 months; provided, however, that after such time, if
ever, that Chevron commissions its new black oil Barge Harbor Lines and
discontinues its use of the Black Oil Pipeline, the reference time period will
be

                                       8
<PAGE>
 
          reduced from the immediately preceding 12 months to the immediately
          preceding 1 month for both the numerator and denominator for the User
          Percentage.

          In determining the amount of Line Displacement Stock that is
          associated with LSFO movements, HECO will only be charged for what is
          pumped into the line from the delivering tanks located at the Refinery
          and for what is pumped from the receiving tanks located at HMT during
          the pump back operation in excess of the volume that is required to
          displace the oil in the Black Oil Pipeline from HMT to the Refinery.

Chevron shall maintain adequate records to allow an audit of such records to
verify to HECO that Chevron's Maintenance Charges are Reasonable Costs.  Chevron
shall provide HECO with monthly summaries within 10 days following the end of
each month during the term hereof describing the maintenance performed during
the month.

All proposed work in this Section 3.3.C that has not been budgeted per Article
3A contained herein must be approved by HECO, whose approval shall not be
unreasonably withheld.  HECO will give Chevron either its approval or a reason
why HECO is denying its approval within 10 business days upon receiving written
notification from Chevron requesting approval from HECO for the proposed work to
commence.  HECO's approval will be granted to Chevron by default if HECO does
not give Chevron its decision within 10 business days after receiving written
notification from Chevron for the matter in question.

HECO may request, and Chevron may not unreasonably withhold approval for HECO to
perform itself all maintenance and construction work on the Kahe pipeline in
lieu of paying Chevron a maintenance charge per section 3.3.C, (i), (ii), and
(iii) for similar work which value would be in excess of $10,000 per Year.
Chevron shall give HECO at least 30 calendar days notice, when practicable, of
unbudgeted maintenance or construction projects of $10,000 or more, so that HECO
may exercise its option.  HECO must inform Chevron within 10 business days of
such notice if it wishes to exercise its option or it will lose its ability to
exercise the option.  The quality of maintenance and construction work performed
by HECO shall be in compliance with U.S. Department of Transportation (DOT)
standards.  Chevron reserves the right to provide an on-site representative to
be charged per Section 3.3.C (ii) to monitor the work and maintain applicable
records.  A separate agreement between Chevron and HECO will specify who will be
doing the work, their level of experience, and how they will be supervised.


Section 3.3.D:  Invoices and Payment

Chevron will issue invoices for each month's Facility Charge on the fifteenth
Day of the current month.  Chevron will issue invoices for the Throughput and
Maintenance Charges in the month following the month in which the services and
expenses are incurred.  HECO will pay these invoices in accordance with Article
9.

                                       9
<PAGE>
 
Section 3.3.E: Pipeline  Site Remediation

a)   Responsibility
 
     Chevron shall expeditiously perform Site Remediation occurring from a leak,
     rupture or other incident to the Pipelines. To the extent such incidents
     derive from delivering LSFO or Line Displacement Stock on behalf of HECO
     (for which HECO has risk of loss pursuant to Section 3.6), or from
     movements of Line Displacement Stock or Warm Up Stock (for which HECO has
     risk of loss pursuant to Section 3.6) associated with LSFO movements on
     behalf of HECO, any Site Remediation Costs incurred by Chevron for such
     Site Remediation shall be entirely for the account of HECO and invoices for
     such services will be rendered by Chevron in accordance with Article 9 of
     this Contract; provided that HECO shall have no obligation to pay for any
     portion of Site Remediation Costs caused by the [---] negligence or [---]
     misconduct of Chevron, its employees and its contractors.
     
b)   Chevron Giving HECO Open Access to Records

     Given the nature of Site Remediation activity that typically requires
     prompt action, Chevron shall use reasonable efforts to provide HECO with
     open access to all records in a reasonably timely manner which contain
     information about: (1) any written communication received by Chevron from
     any agency regarding any discharge, spill or release of product, (2) notice
     of any demand, claim or suit regarding same, for which HECO may be
     responsible, and (3) all invoice data and operating/field information
     pertinent to Site Remediation activities which should reasonably be
     documented in monitoring Site Remediation activities.
 
c)   See Definitions for a definition of Site Remediation as described above.
 
d)   Chevron shall give reasonable efforts to give HECO access to all Site
     Remediation related meetings and activities and all individuals involved
     therewith.
 
e)   If, at any time, HECO determines that Chevron or its agents should
     discontinue Site Remediation activities, HECO shall so notify Chevron or
     its agent and thereafter Chevron or its agent shall have no right to
     continue said activities at HECO's expense; however such notification shall
     not affect any liability of HECO to Chevron or any third parties,
     including, but not limited to government agencies.
 
f)   The provisions of this Section 3.3.E shall survive the termination of this
     Contract to the extent they apply to events which occurred during the term
     of this Contract.


Section 3.3.F:  Discontinued Operation of Honolulu Generating Plant

After HECO has discontinued operation at its Honolulu generating plant, and
provided HECO, at its expense, has installed storage tanks and pumps as
necessary to handle Line Displacement Stock and Warm Up Stock used in connection
with movements of LSFO to Waiau, HECO shall

                                       10
<PAGE>
 
not be charged Facility, Throughput, or Maintenance Charges associated with the
section of the Pipelines between HECO's Waiau and Iwilei tank fields.


Section 3.4: Modification, Relocation, and Replacement of Facilities

If subsequent to January 1, 1998, modifications to any part of Chevron's Black
Oil Pipeline or any relocation or replacement is proposed by Chevron to HECO,
and it has not been budgeted per Article 3A contained herein, HECO's approval is
required, which approval shall not be unreasonably withheld. HECO will give
Chevron either its approval or a reason why HECO is denying its approval within
10 business days upon receiving written notification from Chevron requesting
approval from HECO for the proposed work to commence.  HECO's approval will be
granted to Chevron by default if HECO does not give Chevron its decision within
10 business days after receiving written notification from Chevron for the
matter in question.

Unless otherwise paid for by HECO, an additional Non-Adjusting Capital Charge
component of the Facility Charge shall be established and assessed for the
following scope of work to assure a [---] return after tax on the additional
capital employed by Chevron using a [---] year economic life, except to the
extent that such modification, relocation or replacement is reimbursed by
another party, including but not limited to a governmental agency. HECO's share
of any such additional Non-Adjusting Capital Charge component will be calculated
according to the User Percentage.

The work that would be pertinent to this Section 3.4 would include:

(i)       Replacement of any continuous section of Chevron's Black Oil Pipeline
          1000 feet or more in length.

(ii)      Relocation of any continuous section of Chevron's Black Oil Pipeline
          500 feet or more in length.

(iii)     Complete replacement of any single piece of equipment, costing
          more than $20,000 per occurrence.

(iv)      Any partial replacement of equipment costing more than  $10,000 per
          occurrence.

Coincident with the additional Non-Adjusting Capital Charge component for new
portions of line, the adjustable and non-adjusting components of the Facility
Charge shall be adjusted to reflect only the proportion of the Black Oil
Pipeline and equipment that is still utilized after the replacement or
relocation.  Throughput Charges shall also be adjusted to reflect any change in
the amount of power used for pumping and steam used for the reheat station at
Waiau.

Any charges for a modification, relocation or replacement will not begin until
the complete commissioning of such changes.

                                       11
<PAGE>
 
Section 3.5: LSFO Movement Coordination and Reporting

Section 3.5.A: Coordination

Chevron and HECO will mutually coordinate the transport of LSFO from HECO's BPTF
and the delivery of Chevron's LSFO (purchased under the LSFO Supply Contract, of
even date herewith, between Chevron and HECO) to HECO's storage tanks at Kahe,
Waiau and Iwilei.  Transport scheduling shall be flexible to assure that HECO's
generating plants' tankage is kept reasonably full and the LSFO which HECO is
purchasing from Chevron is delivered from Chevron's Refinery at a reasonably
uniform rate in accordance with the LSFO Supply Contract.  To assist in the
coordination of transport:

     i)   HECO shall provide Chevron consumption forecasts ten days prior to the
          beginning of any month for the four subsequent months. The forecast
          for the first subsequent month shall define on a weekly basis the LSFO
          demands by each of HECO's power plants. The forecast for the second,
          third and fourth subsequent months shall define the LSFO requirements
          on a monthly basis for each such plant, and
 
     ii)  Each week, Chevron shall provide HECO a schedule of daily transports
          of LSFO for each of the fourteen subsequent days.
 
     iii) If there is any subsequent change in the schedule of more than 48
          hours or any change in volume of more than 10,000 barrels, Chevron
          will immediately inform HECO. For all LSFO deliveries, Chevron's
          designated operator shall call HECO's designated operator to confirm
          HECO tank readiness and confirm acceptable volumes prior to the line
          warm up operation which precedes the LSFO delivery. Chevron's
          designated operator shall also call the HECO's designated operator
          between 3 and 4 hours before the actual fuel delivery to HECO to re-
          confirm HECO tank readiness.


Section 3.5.B: Reporting

Chevron shall provide HECO with transport summaries as transports occur,
describing the following:

     (i)  Volumes, dates and sources of stock movements to HECO's storage tanks
          at Kahe, Waiau and Iwilei through the Pipelines, and
     (ii) Analysis of samples of HECO's stocks transported through the
          Pipelines, per Addendum 2.

                                       12
<PAGE>
 
Section 3.6: Title and Risk of Loss

Title to and risk of loss for the LSFO, which is transported from the Refinery
to the BPTF, shall transfer to HECO as the LSFO passes into HECO's pipeline at
HECO's BPTF at points A in Appendix 1.  For LSFO which is sent directly to the
Kahe tank field from Chevron's Refinery without first being sent to HECO's BPTF,
title and risk of loss shall transfer to HECO when the LSFO first enters HECO's
Kahe pipeline at points B in Appendix 1.  The title and risk for loss of the
LSFO that is sent directly to HECO's tank fields at Waiau and Iwilei without
first being sent to HECO's BPTF shall transfer to HECO when the LSFO first
enters into Chevron's Black Oil Pipeline at point C in Appendix 1.  HECO shall
bear the risk of loss of LSFO transported in the Pipelines pursuant to this
Section 3.6 except where such loss is attributable to Chevron's [---]
negligence or [---] misconduct.

Title to Line Displacement Stock and Warm Up Stock shall remain with Chevron
except for the Line Displacement Stock that is used to complete deliveries of
LSFO to HECO.  HECO shall assume title of this Line Displacement Stock as it
enters HECO's piping at its generating plants at points D in Appendix 1.  Risk
of loss for Line Displacement Stock and Warm Up Stock shall transfer to HECO
when the Line Displacement Stock and Warm Up Stock leave the Refinery piping and
enter into the Black Oil Pipeline at point C in Appendix 1.  Risk of loss for
the Line Displacement Stock and Warm Up Stock shall also transfer to HECO when
the Line Displacement Stock and Warm Up Stock leave Chevron's piping at HMT and
enters the Black Oil Pipeline when it is pumped back from HMT to the Refinery at
point E in Appendix 1.  HECO shall bear the risk of loss of Line Displacement
Stock and Warm Up Stock transported in the Pipelines as described in this
Section 3.6 except where such loss is attributable to Chevron's [---] negligence
or [---] misconduct.

Risk of loss for the Line Displacement Stock and Warm Up Stock shall transfer
back to Chevron when the Line Displacement Stock and Warm Up Stock leave the
Black Oil Pipeline and enter into Chevron's piping at HMT at point E in Appendix
1. Risk of loss for the Line Displacement Stock and Warm Up Stock shall also
transfer back to Chevron during the pump back operation from HMT to the Refinery
when the Line Displacement Stock and Warm Up Stock leave the Black Oil Pipeline
and enter into Chevron's piping at the Refinery at point C in Appendix 1.


Section 3.7: Chevron's Operating and Maintenance Offset

Notwithstanding Article 17, if a cold plug occurs for any reason other than
HECO's sole negligence, on the Black Oil Pipeline, Chevron shall credit HECO's
Facility Charge Account for an amount which is the lesser of (1) [---] of the
expenses incurred for removing the cold plug and (2) [---] per incident;
provided, however, Chevron's payment under this Section 3.7 shall not be limited
where such expenses are attributable to Chevron's [---] negligence or [---]
misconduct.

Notwithstanding Article 17, if an oil spill occurs, for which oil HECO has risk
of loss pursuant to Section 3.6, on the Black Oil Pipeline whose cause was the
direct result of Chevron's

                                       13
<PAGE>
 
negligence, Chevron shall credit HECO's Facility Charge Account for an amount
which is the lesser of (1) [---] of the Site Remediation Costs and (2 [---] per
incident; provided, however, Chevron's liability under this Section 3.7 shall
not be limited where such expenses are attributable to Chevron's [---]
negligence or [---] misconduct.

Chevron shall credit HECO's Facility Charge Account per this Section 3.7 in the
month following the month the expenses are incurred.


Section 3.8  Review of Operating and Maintenance Procedures

Chevron shall allow HECO reasonable access, at the Refinery, to Chevron's
current published operating and maintenance procedures and invoice data
pertinent to this Contract.  The information shall include 3rd party invoices
and proposed inspection and testing measures being implemented after the
Effective Date of this Contract, that refer to the operation of the Kahe line,
Black Oil Pipeline, and BPTF, for HECO's sole purpose to judge if Chevron's
procedures and/or costs for rendering such services are acceptable to HECO.
HECO's access to these procedures specifically excludes access to the operation
and maintenance history, inspection records, etc. of the Black Oil Pipeline
prior to the Effective Date of this Contract.

HECO may enlist the aid of a Chevron approved third party (at HECO's expense) to
review such procedures.

If HECO determines that any such Chevron current operating or maintenance
procedure does not meet HECO's minimum standards, or if HECO provides Chevron
with different procedures which HECO believes to be better than Chevron's,
Chevron and HECO shall meet within 30 Days after HECO submits written notice of
its desire to meet with Chevron and review such procedures.  As part of this
review, as soon as possible but in no case later than 60 Days after meeting with
HECO, Chevron shall inform HECO of the approximate costs of meeting these
revised and/or new procedures.  If after this joint review, both parties
mutually agree to comply with any revised and/or new procedures, then HECO shall
be responsible for any incremental Reasonable Costs incurred by Chevron to meet
these revised and/or new procedures.


                             ARTICLE 3A: Budgeting

Upon May 15 of each year, Chevron shall submit to HECO for review and comment an
itemized, monthly capital, operating, and maintenance budget for the next Year
and an estimate of expenses for the following Year for the Pipelines, HECO's
BPTF, and for any other pertinent area for which HECO must expend funds in the
execution of this Contract.

For a Major Maintenance Year, Chevron may budget up to a limit of [---] annually
for Non-discretionary Maintenance items without HECO's approval.  HECO's

                                       14
<PAGE>
 
approval is required for all Non-discretionary Maintenance work in excess of
[---] and for all other capital and maintenance work; provided, however, Chevron
may budget up to a limit of [---] per year for discretionary maintenance without
HECO's approval. There shall be no less than two Non-Major Maintenance Years
between Major Maintenance Years.

For a Non-Major Maintenance Year, Chevron may budget up to a limit of [---]
annually for Non-discretionary Maintenance items without HECO's approval. HECO's
approval is required for all Non-discretionary Maintenance work in excess of
[---] and for all other capital and maintenance work; provided, however, Chevron
may budget up to a limit of [---] per year for discretionary maintenance without
HECO's approval.  The [---] threshold limit for Non-discretionary Maintenance
for Non-Major Maintenance Years will be adjusted annually beginning January 1,
1998, using the composite factor (0.5 An + 0.5 Bn), where "An" and "Bn" are
described in Addendum 1 attached.

HECO will give Chevron either its approval or a reason why HECO is denying its
approval within 120 Days upon receiving, in writing, Chevron's proposed budget;
provided, however, HECO's approval shall not be unreasonably withheld.

HECO's budget approval will be granted to Chevron by default if HECO does not
give Chevron its decision within 120 Days after receiving Chevron's proposed
budget.

Upon the signing of this Contract, the parties shall meet as soon as practicable
to review and approve the budget  for the Year of the Effective Date of this
Contract, and forecast of expenses for the following Year in accordance with the
intent of this Article.


ARTICLE 4:  HECO's Use of Chevron's Tanker Mooring Facilities and Submarine Line

Section 4.1:  Use of Chevron's Facilities

Chevron agrees to make available to HECO Chevron's Barbers Point tanker mooring
facilities and one of Chevron's submarine lines ("Marine Facilities") as
described in Addendum 3 hereto, on a non-exclusive basis for HECO to receive
HECO's third party LSFO into HECO's BPTF provided:

(A)  Chevron shall have the right to review each vessel nominated by HECO or by
a representative designated in writing by HECO ("HECO's vessel") prior to the
use of the Marine Facilities. HECO may submit the names of vessels it will
consider nominating to obtain early acceptance of such vessels from Chevron up
to three months in advance of the actual nomination. At the time each specific
vessel is submitted for early acceptance or nominated for actual use Chevron
shall have the right to refuse acceptance of such vessel nomination if Chevron
determines that such vessel is unacceptable; however, once given, Chevron's
acceptance of a vessel shall remain in effect for six months or until the vessel

                                       15
<PAGE>
 
   next discharges at the terminal, whichever occurs first; unless there is a
   significant change in the vessel's operational, environmental or safety
   status, in which case Chevron may cancel its acceptance.  In making such
   determination, Chevron shall use the same standards in accepting vessels for
   HECO's use as Chevron uses in accepting vessels for its own use.  Chevron's
   acceptance of a vessel shall not imply a continuing or future acceptance of
   the vessel, except as described herein.

   In the event a vessel submitted by HECO for early acceptance or for a
   specific nomination is rejected by Chevron, Chevron shall provide
   satisfactory documentation for the basis of rejection. Chevron's acceptance,
   cancellation or rejection of HECO's vessel nomination shall be communicated
   to the nominator of such vessel after Chevron's receipt of the nomination and
   all the information necessary for Chevron to determine the vessel's
   suitability, as follows:

     (i)  Early acceptance or rejection of a vessel shall be given within seven
          Days.

     (ii) Acceptance or rejection of a specific nomination shall be given within
          one business day.

   All such communications may be made by electronic mail or facsimile.  The
   typical information necessary to determine a vessel's suitability is
   documented in the Chevron Products Company Marine Terminal Manual for
   Barber's Point Offshore Tanker Terminal, which may be revised from time to
   time, and which is more particularly described Addendum 4.  Chevron shall not
   be liable for any loss, damage or delay caused by its rejection of a vessel
   nomination as provided herein.  In no event shall the acceptance or rejection
   of a vessel by Chevron be construed in any manner as a representation by
   Chevron of the vessel's operational, environmental or safety status.

(B) The minimum cargo size shall be [---] Physical Barrels, except that HECO
    shall be permitted to deliver one [---] Physical Barrel cargo each calendar
    quarter.

(C) HECO shall be responsible for any damage to the Marine Facilities, which
    arises from the use of the Marine Facilities under this Section 4.1, in
    accordance with Article 17 hereof.

(D) HECO's vessel shall arrange to have, while at or near the Marine Facilities,
    the services of one of Chevron's mooring masters who shall be the servant of
    HECO's vessel.  When HECO's vessel employs mooring launches and tugs for
    berthing and unberthing the vessel, they shall also be servants of HECO's
    vessel.  The master of HECO's vessel shall remain in control of his vessel
    at all times.

(E) HECO's vessel shall arrive with an empty compartment of at least 15,000
    Physical Barrels capacity for the purpose of receiving a suitable
    displacement stock from Chevron's Refinery or, at Chevron's option expressed
    at the time of accepting the vessel nomination the vessel shall provide
    Bunker C quality flush oil, for the purpose of displacing LSFO from the
    submarine line after discharging its LSFO cargo.

                                       16
<PAGE>
 
Section 4.2: Compensation

Section 4.2.A: Compensation for LSFO Received

As compensation for the utilization of the Marine Facilities to receive LSFO for
HECO, HECO shall pay to Chevron the sum of the following:

     (i)  A fee for the use of the Marine Facilities of [---] per Physical
          Barrel of LSFO received for HECO.  Thirty percent of the fee is deemed
          to be the capital component and shall not be adjusted, and seventy
          percent shall be adjusted quarterly beginning January 1, l998, in
          accordance with the composite factor (0.60 An + 0.20 Bn + 0.20 Cn),
          with "An", "Bn" and "Cn" defined in Addendum 1 hereto.  The quantity
          of LSFO received for HECO shall be determined in the manner specified
          in Article 7.

     (ii) The actual Reasonable Costs Chevron is obligated to pay others for
          items such as, but not limited to, the use of tugs, launches,
          Chevron's mooring masters, or government fees.


Section 4.2.B: Compensation for Line Displacement Stock

To the extent it is necessary to deliver Line Displacement Stock to HECO, HECO
shall purchase such stock according to Article 8.  The quantity of Line
Displacement Stock delivered to HECO shall be determined according to Article 7.


Section 4.2.C:   Credit for Cargo Used as Line Displacement Stock

To the extent that small portions of HECO's LSFO cargo must be transferred into
Chevron's Refinery tankage to protect the quality of the remaining LSFO cargo
from being downgraded by commingling with low flash point Line Displacement
Stock within the submarine line, Chevron shall credit HECO for such LSFO at
Chevron's then current price of LSFO sold to HECO. To the extent that HECO's
flush oil is transferred into Chevron's Refinery tankage or remains within the
submarine line as Line Displacement Stock, Chevron shall credit HECO for such
flush oil according to Article 8.  The quantity of such LSFO or flush oils shall
be determined according to Article 7.

                                       17
<PAGE>
 
Section 4.2.D: Clean Island Council

HECO shall pay a pro-rated share of Chevron's fees to the Clean Island Council
associated with the use of Chevron's Marine Facilities, which is calculated by
first multiplying such fee by the total Physical Barrels of HECO's or HECO's
third-party LSFO transported through the Marine Facilities during the
immediately preceding twelve months and then dividing by the total Physical
Barrels of hydrocarbons transported through Chevron's Marine Facilities during
such twelve months.


Section 4.3: LSFO Movement Coordination and Reporting

Section 4.3.A: Notification of Estimated Vessel Arrival

     (i)   HECO shall propose for Chevron's approval a four day arrival window
           for HECO's vessel at least 30 days in advance of estimated vessel
           arrival. After Chevron's approval, changes in the arrival window may
           only be made with mutual consent of the parties.

     (ii)  HECO shall update Chevron weekly regarding the anticipated vessel
           arrival date.

     (iii) After HECO has proposed an arrival window and until HECO's vessel
           departs, Chevron shall provide HECO weekly updates on Chevron's
           marine terminal schedule.

     (iv)  HECO shall give Chevron 7, 5, 4, 3, 2, and 1 day notice by electronic
           mail, facsimile, or telephone of the vessel's estimated time of
           arrival ("ETA") at the Marine Facilities. HECO will further notify
           Chevron of any ETA changes exceeding twelve hours and after the one-
           day notice, whenever a vessel's ETA changes by more than six hours.


Section 4.3.B: Notice of Readiness

     (i)   When HECO's vessel arrives at the customary anchorage or other place
           of waiting at the Marine Facilities and is in all respects ready to
           proceed to berth and commence discharging LSFO, the Master or his
           agent shall tender to Chevron or its agent at the Marine Facilities,
           a Notice of Readiness ("NOR") of the vessel to discharge LSFO, by
           letter, electronic mail, facsimile, radio, or telephone.

     (ii)  If HECO tenders the vessel's NOR during its four day arrival window,
the NOR shall be effective upon receipt.  If HECO's vessel tenders NOR before
the first day of the arrival window the NOR shall be effective 00:01 hours local
time on the first day of the arrival window. However, Chevron shall give
consideration on a reasonable efforts basis to allowing such vessel to berth and
discharge prior to the

                                       18
<PAGE>
 
           first day of the vessel's arrival window, provided that in Chevron's
           sole judgment operating circumstances at the receiving facility so
           permit. If HECO tenders the vessel's NOR after the end of the arrival
           window, the NOR shall be effective when the vessel is all fast in
           berth.

     (iii) HECO's vessel shall be provided a berth in its turn based upon the
           effective date and time of its NOR, provided that if HECO's vessel
           tenders NOR after the end of its arrival window, it shall be provided
           a berth as soon as is convenient for the Marine Facilities.  Chevron
           shall exercise all reasonable efforts to accept the vessel for
           unloading at the earliest possible time.

     (iv)  If HECO's vessel arrives within the previously agreed four day
           arrival window, Chevron shall have the right to delay berthing HECO's
           vessel, if necessary, for Chevron's operational, or other reasons,
           provided that Chevron maintains a reasonable pumping schedule to
           HECO's Kahe, Waiau and Iwilei storage tanks. If Chevron delays HECO's
           vessel under the circumstances defined in this Section 4.3.B (iv),
           then Chevron shall pay demurrage to HECO, against HECO's invoice, for
           delays to HECO's vessels so incurred, pursuant to Section 4.3.D.


Section 4.3.C: Berth Time

HECO shall be allowed berth time (defined as first line fast to all lines free)
within which to complete discharging of each full or part cargo of LSFO.  This
berth time is the sum of six hours for berthing and unberthing and the number of
hours to unload its LSFO at an unloading rate of 5,000 barrels per hour.  If
HECO's vessel exceeds berth time for any reason or if HECO's vessel fails to
vacate berth after completing discharging, and failure to vacate is attributable
to vessel's condition or breakdown and/or to owner, operator, master, officers
or crew of the vessel, vessel's agent or HECO, such excess berth time shall be
subject to demurrage claims of Section 4.3.D.


Section 4.3.D: Demurrage

     (i)   Chevron will pay demurrage to HECO against HECO's invoice, supported
           by such data as may reasonably be requested, for all delays caused by
           Chevron subsequent to six hours after NOR is effective and prior to
           the time HECO's vessel is advised by Chevron that a berth is
           available for the vessel, provided that Chevron shall not be liable
           for any delay caused by any contingency (as defined in Article 11)
           including fire, explosion, strike, lockout, stoppage or restraint of
           labor or by breakdown of machinery or equipment on or about the
           Refinery or Marine Facilities or, strike, lockout, stoppage or
           restraint of labor of master, officers or crew of HECO's vessel, or
           of tugboat or pilots, or for any other cause which is beyond
           Chevron's reasonable control, including weather delays.

                                       19
<PAGE>
 
     (ii)  HECO shall pay Chevron, against Chevron's invoice supported by such
           data as may reasonably be requested, for Reasonable Costs for
           demurrage, caused by HECO which Chevron may incur, including such as
           may be incurred due to resulting delay in the berthing of other
           vessels awaiting their turn at berth.

     (iii) For vessels not documented in the U.S., demurrage shall be paid for
           all delay time, on an hourly basis or pro rata thereof, at a rate in
           accordance with the U.S. dollar equivalent as stated in the Worldwide
           Tanker Nominal Freight Scale ("Worldscale"), or such generally
           accepted scale as may replace Worldscale, for the size vessel in
           question adjusted to the level of the Average Freight Rate assessment
           ("AFRA") or such generally accepted scale as may replace AFRA, in
           force on the day of commencement of loading for vessels of similar
           size, or the actual charter party demurrage rate at which HECO or
           Chevron has chartered the vessel, whichever is less.

     (iv)  For vessels documented in the U.S., demurrage shall be paid for all
           delay time, on an hourly basis or pro rata thereof, at a rate in
           accordance with the U.S. dollar equivalent as stated in the American
           Tanker Rate Schedule Revised ("AR"), or such generally accepted scale
           as may replace AR, for the size vessel in question adjusted to the
           level of the U.S. Freight Rate Average ("USFRA") or such generally
           accepted scale as may replace USFRA, in force on the day of
           commencement of loading for vessels of similar size, or the actual
           charter party demurrage rate at which HECO or Chevron has chartered
           the vessel, whichever is less.


Section 4.3.E: Vessel Berth

Chevron shall provide a berth as described in Addendum 3, and meeting the
requirements of Appendix 2, so that HECO's vessels meeting the requirements of
Appendix 2 may proceed to, lie at and depart from such berth, and Chevron shall
not be deemed to warrant the safety of public channels, fairways, approaches
thereto, anchorages, or other publicly maintained areas either inside or outside
the port area where Chevron's berth is located.  If HECO's vessel fails to abide
by the conditions of use, Chevron shall be entitled to order the vessel to
vacate the berth, provided that the vessel shall be entitled to tender a new NOR
as set forth in Section 4.3.A upon correction of the failure.  Chevron shall not
be liable for any loss, damage, injury or delay resulting from conditions at any
ports, berths, docks, anchorages or other places not directly caused by
Chevron's fault or neglect, or which could have been avoided by the exercise of
reasonable care on the part of HECO's vessel's master.

                                       20
<PAGE>
 
Section 4.3.F: Other Marine Provisions

     (i)   Hoses for discharging shall be furnished by Chevron in accordance
           with Chevron's normal practice and shall be connected to and
           disconnected from vessel's receiving flanges by HECO's vessel's crew.

     (ii)  Vessels arranged for by HECO will fully comply (or will hold
           necessary waivers if not in compliance) with all applicable U.S.
           Coast Guard regulations. Any Reasonable Costs, including delays
           resulting from vessel's non-compliance with U.S. Coast Guard
           regulations, shall be at the expense of HECO.

     (iii) HECO's vessels when berthed at the Marine Facilities will maintain
           their engines in readiness and will be discharged in such a manner
           that they, at any stage of discharging operations, are able, if
           necessary for any reason, to immediately shut down cargo operations,
           and promptly disconnect hoses and mooring lines and vacate the berth.

     (iv)  HECO's vessels will comply with all applicable Federal, state,
           regional and local government laws, regulations and ordinances,
           including but not limited, to air and water pollution.


Section 4.3.G: Reporting

Chevron will provide HECO with monthly summaries within ten days following the
end of each month with the following information:

     (i)  Vessel turnaround data, including pumping rates, for each cargo
          unloaded from HECO's vessels through Chevron's Marine Facilities.

     (ii) Analysis of samples of each cargo transferred through the submarine
          lines, per Addendum 2.


Section 4.4: Title and Risk of Loss

Title to third party LSFO purchased by HECO and transported for HECO in
Chevron's Marine Facilities under this Article 4 shall at all times be with
HECO.  HECO shall bear the risk of loss of the LSFO transported for HECO in
Chevron's Marine Facilities under this Article 4 except to the extent that such
loss was due to the [---] negligence or [---] misconduct of Chevron or its
agents.

                                       21
<PAGE>
 
Section 4.5: Oil Pollution Insurance

HECO warrants that HECO's vessel's owner will have in place the standard oil
pollution coverage available from their Protection & Indemnity Insurance Club
(U.S. $500 million available as of February 20, 1995), together with all
additional oil pollution coverage which is available as of the date of the use
of the Marine Facilities through their P&I Club or through underwriters
providing first class security (U.S. $200 million available as of February 20,
1995).  HECO further warrants that such coverage will remain in effect during
HECO's use of HECO's vessel.  Such insurance shall include, but not be limited
to, coverage for injuries to or death of masters, mates and crew; excess
collision liabilities and pollution liabilities imposed by federal and state
laws (if applicable).


Section 4.6 Site Remediation

a)  Responsibility
 
    In the event an escape or discharge of oil occurs from HECO's vessels and
    causes or threatens to cause pollution damage, HECO or HECO's vessel's
    master will promptly take whatever measures are necessary to prevent or
    mitigate such damage. HECO hereby authorizes Chevron, or its agent, at
    Chevron's option, upon notice to HECO or HECO's vessel's master, to
    undertake such measures as are reasonably necessary to prevent or mitigate
    the pollution damage. Chevron shall expeditiously perform all Site
    Remediation relating to any release, discharge, spill or threat thereof,
    occurring from any leak, rupture or other incident to the Mooring Facilities
    and Submarine lines. To the extent any Site Remediation is undertaken as a
    result of receipts of HECO's third party LSFO or HECO's third party LSFO
    blend components or from movements of Line Displacement Stock or Warm Up
    Stock associated with such LSFO of LSFO blend component receipts, any Site
    Remediation Costs incurred by Chevron for such Site Remediation shall be
    entirely for the account of HECO and invoices for such services will be
    rendered by Chevron in accordance with Article 9 of this Contract; provided,
    however, that HECO shall have no obligation to pay for any portion of Site
    Remediation Costs caused by the [---] negligence or [---] misconduct of
    Chevron, its employees, and its contractors.
    
b)  Chevron Giving HECO Open Access to Records

    Given the nature of site remediation activity that typically requires prompt
    action, Chevron shall use reasonable efforts to provide HECO with open
    access to all records in a reasonably timely manner which contain
    information about: (1) any written communication received by Chevron from
    any agency regarding any discharge, spill or release of product, (2) notice
    of any demand, claim or suit regarding same, for which HECO may be
    responsible, and (3) all invoice data and operating/field information
    pertinent to Site Remediation activities which should reasonably be
    documented in monitoring Site Remediation activities.

                                       22
<PAGE>
 
c)  See Definitions for a definition of Site Remediation as described above.

d)  Chevron shall use reasonable efforts to give HECO access to all Site
    Remediation related   meetings and activities and all individuals involved
    therewith.
 
e)  If, at any time, HECO determines that Chevron or its agents should
    discontinue Site Remediation activities, HECO shall so notify Chevron or its
    agent and thereafter Chevron or its agent shall have no right to continue
    said activities at HECO's expense; however such notification shall not
    affect any liability of HECO to Chevron or any third parties, including, but
    not limited to government agencies.

f)  The provisions of this Section 4.6 shall survive the termination of this
    contract to the extent they apply to events which occurred during the term
    of this contract.


              ARTICLE 5: Operation and Maintenance of HECO's BPTF

Section 5.1: Tank Field Facilities and Service

Section 5.1.A: Tank Field Facilities

HECO has a tank field facility (BPTF) located adjacent to Chevron's Barbers
Point Refinery, which is for the receipt and storage of fuel.  Chevron has Tank
Field Support Systems which interconnect with its Refinery systems to provide
services to HECO's BPTF. HECO and Chevron agree that Chevron shall operate and
maintain HECO's BPTF as if it were an extension of Chevron's Refinery tank
field.  In that regard, HECO and Chevron agree that HECO's BPTF and Chevron's
Tank Field Support System shall include only the facilities outlined in Addendum
5 and the additions made per Section 5.1C.  Together these tank field and tank
field support facilities shall be referred to as "Tank Field Facilities."  HECO
shall provide electrical power to its BPTF.  Chevron shall provide low pressure
steam and firewater to HECO's BPTF.


Section 5.1.B: Services

Chevron shall operate HECO's BPTF in compliance with all applicable laws and
regulations, in accordance with Chevron's operating standards and instructions.
In carrying out its duties, Chevron shall exercise a similar degree of skill and
care  that Chevron utilizes in the operation of its tanks, pipelines, and other
equipment.

Chevron shall, at a minimum, maintain Pipelines in compliance with all
applicable laws and regulations and in accordance with Chevron's Non-
discretionary Maintenance.  In carrying out its duties, Chevron shall exercise a
similar degree of skill and care that Chevron utilizes in performing the Non-
discretionary Maintenance on its tank fields and related equipment.

                                       23
<PAGE>
 
Chevron's duties include:

     (i)    Overall supervision of the BPTF,

     (ii)   Handling receipt of fuel into the BPTF,

     (iii)  Gauging and sampling tanks,

     (iv)   Handling movement of LSFO from tankage to pipeline booster pumps for
            transfer to HECO's storage tanks at Kahe, Waiau and Iwilei and
            occasionally to the Kalaeloa Combined Cycle Power Plant storage
            tanks at Barbers Point.

     (v)    Handling movement of fuel within the BPTF, including tank-to-tank
            transfers and tank mixing.

     (vi)   Accounting and reporting,

     (vii)  Maintenance of all BPTF equipment,

     (viii) Housekeeping,

     (ix)   Security,

     (x)    Laboratory services.

Chevron's operating standards and instructions are available for HECO's
inspection at Chevron's Refinery.  Applicable operating standards and
instructions include, but are not limited to, those listed in Appendix 3.


Section 5.1.C: Tank Field Facility Additions and Modifications

Any time during the term of this Contract that HECO and Chevron agree that
additions or modifications to HECO's BPTF or to Chevron's Tank Field Support
Systems, as listed in Addendum 5, are desired or required for the purpose of
operating and maintaining HECO's BPTF in accordance with this Article 5, or if
said additions or modifications are required by government regulations, HECO and
Chevron further agree that:

     (i)    Additional facilities or modifications to Chevron's Tank Field
            Support System(s) shall be designed and constructed by Chevron.

     (ii)   Additional facilities or modifications to HECO's BPTF shall be
            designed and constructed using standards that are acceptable to both
            HECO and Chevron. In that regard, Chevron shall have the right and
            opportunity to review and approve the design and construction
            specifications for the BPTF on all facility replacements or
            modifications; provided, however, Chevron's approval shall not be
            unreasonably withheld. Chevron agrees to conduct such review in an
            expeditious manner. Chevron shall have the right to inspect HECO's
            BPTF during the construction of additions or modifications in order
            to assure conformance with the

                                       24
<PAGE>
 
            specifications reviewed and accepted by Chevron. It is expressly
            understood and agreed by the parties hereto that Chevron's
            acceptance of the design and construction specifications of HECO's
            BPTF or additions shall in no way imply any responsibility therefor
            by Chevron and it is expressly agreed by HECO that Chevron shall, as
            a result of its review and acceptance of said specifications, assume
            no liability whatsoever for the accuracy, correctness or proper
            modification or replacement thereof.

     (iii)  Chevron shall maintain and operate HECO's additional or modified
            Tank Field Facilities in accordance with Section 5.1.B.

     (iv)   HECO shall pay Chevron a fee that is in addition to the fee
            described in Section 5.2.A, as determined in accordance with Section
            5.2.B.

The costs of additions or modifications to Chevron's Tank Field Support Systems
shall be allocated between Chevron and HECO on a pro-rata basis, determined by
the benefits received by each party.  The cost of additions and modifications to
the BPTF shall be determined in accordance with Section 5.2.A. (iii). Any
allocation of costs to HECO exceeding one hundred thousand dollars ($100,000)
requires HECO's consent HECO's approval will be granted to Chevron by default if
HECO does not give Chevron its decision within 10 business days after receiving
written notification from Chevron for the matter in question.  The notification
from Chevron shall include the information necessary to make a reasonable
determination on the matter in question.


Section 5.1.D  Additional Services

If at any time HECO desires Chevron to provide services in addition to those
described in Section 5.1.B, said additional services must be acceptable to
Chevron. HECO shall pay Chevron an additional fee for the additional services,
as determined in accordance with Section 5.2.B.


Section 5.2: Compensation

Section 5.2.A: Base Compensation

As compensation for the operation and maintenance of HECO's BPTF in accordance
with the terms and conditions hereof, HECO shall pay to Chevron the following
fees:

     (i)    A Base Fee of [---] per month; [---] of which is to cover normal
            operation, maintenance and services which shall be subject to
            adjustment quarterly beginning January 1, 1998, in accordance with
            factor "An" defined in Addendum 1 attached; and [---] of which is a
            monthly management fee which shall not be subject to adjustment
            during the term of this Contract.

                                       25
<PAGE>
 
(ii)   Monthly steam costs for heating fuel in tankage and piping and through
       heat exchangers for pumping. A portion of the low pressure steam shall be
       exchanged with the steam used by HECO for Chevron pursuant to Section
       6.4.A. The remaining portion, if any, shall be charged at [---] per 1000
       pounds, and shall be adjusted each month in accordance with the ratio of
       the then-current LSFO price within the Chevron-HECO LSFO Supply Contract,
       divided by $15.50.

(iii)  The cost of any complete replacement of HECO's equipment, or any partial
       replacement of HECO's equipment, in which the cost exceeds Ten Thousand
       Dollars ($10,000) per incident; and any costs incurred by Chevron for
       additions or modifications to HECO's BPTF or Chevron's Tankfield Support
       System, as described in Section 5.1.C. These costs shall be determined as
       follows:

   a)  [---] Reasonable Costs for maintenance materials.  Material costs include
       all taxes paid on material purchased.

   b)  [---] Reasonable Costs for labor which includes direct supervision and
       technical support, whether contract labor charges or Chevron's labor rate
       at equivalent Contractor's labor rate, including overheads and benefits.
       The term "Contractor" shall mean a mechanical contractor properly
       licensed in the State of Hawaii, which Contractor shall be experienced in
       the type of work to be done and shall be chosen at the sole discretion of
       Chevron.

   c)  [---] Reasonable Costs for direct costs, including but not limited to,
       such items as equipment usage charges (whether Contractor's or Chevron's
       at equivalent Contractor rates), permits and consulting fees.

   d)  All proposed work in this Section 5.2.A(iii) that has not been budgeted
       per Article 3A contained herein must be approved by HECO, whose approval
       shall not be unreasonably withheld. HECO will give Chevron either its
       approval or a reason why HECO is denying its approval within 10 business
       days upon receiving written notification from Chevron requesting approval
       from HECO for the proposed work to commence. HECO's approval will be
       granted to Chevron by default if HECO does not give Chevron its decision
       within 10 business days after receiving written notification from Chevron
       for the matter in question.

   e)  HECO may request, and Chevron may not unreasonably withhold approval for
       HECO to perform itself all maintenance and construction work on the BPTF
       in lieu of paying Chevron a maintenance charge per this section 5.2A
       (iii) for similar work which value would be in excess of $10,000 per
       year. Chevron shall give sufficient notice to HECO of maintenance or
       construction work to be performed so that HECO may exercise its option.
       Chevron shall give HECO at least 30 Days notice when practicable of
       unbudgeted maintenance or construction projects of $10,000 or more so
       that HECO may exercise its option. HECO must inform Chevron within 10
       business days of such notice if it wishes to exercise its option or it
       will lose its ability to exercise the option. Chevron reserves the right
       to

                                       26
<PAGE>
 
        provide an on-site representative to be charged per Section 3.3.C (ii)
        to monitor the work and maintain applicable records.


Section 5.2.B:  Determination of Fees for Additional Operation and Maintenance

The amount of the additional fee paid by HECO to Chevron for the operation and
maintenance of such additional facilities or modifications described in Section
5.1.C and such additional services described in Section 5.1.D shall be
negotiated by HECO and Chevron.  If the parties fail to agree upon a new fee
within 90 days from date of notice, such new fee shall be determined by
arbitration to be conducted in accordance with the rules of the American
Arbitration Association then obtaining.  The dispute shall be heard by three
arbitrators, and the cost of the arbitrators shall be shared equally between
HECO and Chevron.  Each party shall pay its own legal costs.  The arbitration
shall be held in Honolulu, Hawaii, however the selection of arbitrators may not
be limited to Hawaii.

The sole purpose of the arbitration shall be to determine an additional fee for
the expense to Chevron in the performance of its services under Sections 5.1.C
and 5.1.D hereto.


Section 5.2.C:  Invoices and Payment

Chevron will issue invoices for each month's Base Fee on the fifteenth day of
the current month.  Chevron will issue invoices for the monthly steam costs and
the costs for the replacements, additions and modifications under Section 5.2.A.
(iii) in the month following the month in which these costs are incurred.  HECO
will pay these invoices in accordance with Article 9.


Section 5.2D: Chevron's Operating and Maintenance Offset

Not withstanding Article 17, if an oil spill occurs, for which oil HECO has risk
of loss pursuant to Sections 4.4 or 5.4, at HECO's BPTF because one of its tanks
was overfilled due to Chevron's negligence, Chevron shall credit HECO's Facility
Charge Account for an amount which equals the lesser of (1) [---] of the Site
Remediation Costs and (2) [---] per incident; provided, however, Chevron's
payment under this Section 5.2.D shall not be limited where such expenses are
attributable to Chevron's [---] negligence or [---] misconduct.

Chevron shall credit HECO's Facility Charge Account per this Section 5.2.D in
the month following the month the expenses are incurred.

                                       27
<PAGE>
 
Section 5.3: Reports

Chevron shall provide HECO with monthly summaries within 10 days following the
end of each month during the term hereof describing the following:

     (1)  Analysis of samples of each stock transferred in or out of HECO's BPTF
          in accordance with Addendum 2 attached,

     (2)  Summary of maintenance performed during the month.

     (3)  Chevron shall report to HECO "stock summaries" or tank gauging records
          for each tank, showing volumes, times, dates, sources, and
          destinations of stock movements at intervals not to exceed 2 working
          days,

     (4)  Chevron will report to HECO as soon as practicable but in no case more
          than 24 hours from the time of occurrence, the volumes drained,
          spilled or lost from HECO's BPTF.


Section 5.4: Title and Risk of Loss

Title and risk of loss of LSFO blend stock imported by Chevron and stored in
HECO's BPTF shall remain with Chevron until blended to LSFO which is in
conformance with addendum 2, where upon verification by Chevron lab test (and as
specified in the LSFO Fuel Supply Contract of even date herewith and subject to
HECO's timely verification, or at HECO's option, HECO's verbal notice to Chevron
allowing release for shipment prior to verification), title and risk of loss
shall pass to HECO.  Title and risk of loss to the LSFO Blend Stock imported by
HECO and stored in HECO's BPTF shall at all times remain with HECO.  HECO shall
bear the risk of loss or damage to HECO's petroleum products unless such loss or
damage is due to the [---] negligence or [---] misconduct of Chevron, its
employees, or its contractors.


Section 5.5: Insurance

HECO shall maintain at its own expense during the term hereof insurance, in
respect of business, and all activities on or about or in connection with HECO's
Tank Field Facilities, of the types and in the minimum amounts described
generally as follows:

     (A)  Commercial Liability Insurance including Bodily Injury and Property
          Damage Insurance (also including explosion hazard) affording premises,
          products, completed operations, contractual and contingent liability
          (with respect to subcontractors) coverage of not less one million
          dollars ($1,000,000) combined single limit per occurrence for bodily
          injury and property damage.

                                       28
<PAGE>
 
     (B)  A first excess policy over the above Commercial Liability Insurance
          policy with limits of not less than five million dollars ($5,000,000)
          combined single limit.

     (C)  Fire insurance of not less than the value of HECO's tanks plus HECO's
          inventory of fuel therein from time to time to insure property owned
          by HECO which is in the care, custody and control of Chevron. Such
          insurance shall contain a clause waiving subrogation to any rights of
          HECO against Chevron in the event of loss.

The insurance provided above shall include Chevron and its affiliated companies
named as additional insured, it being the intention of the parties that the
insurance so affected shall protect both HECO and Chevron and be the primary
insurance for any and all losses in respect of business and all activities on or
about or in connection with, during the term of this Contract and any extensions
thereof unless such losses or activities are a result of the [---] negligence of
Chevron as provided herein with respect to the activity that is the subject of
the respective insurance claim.  HECO shall furnish certificates satisfactory to
Chevron as evidence of such insurance.  The insurance shall contain provisions
that no cancellation or material changes in any policy shall become effective
except upon thirty days' written notice to Chevron.


Section 5.6: Barbers Point Site Remediation

a)   Responsibilities
 
     If requested by HECO, Chevron shall perform all Site Remediation relating
     to any release, discharge, spill or threat thereof, occurring from any
     leak, rupture or other incident to HECO's BPTF.  All Site Remediation Costs
     incurred by Chevron for any such Site Remediation shall be entirely for the
     account of HECO and invoices for such Site Remediation will be rendered by
     Chevron in accordance with Article 9 of this Contract; provided however,
     HECO shall have no obligation to pay for any portion of  Site Remediation
     Costs caused by the [---] negligence or [---] misconduct of Chevron, its
     employees, and contractors.

b)   Chevron Giving HECO Open Access to Records

     Given the nature of Site Remediation activity that typically requires
     prompt action, Chevron shall use reasonable efforts to provide HECO with
     open access to all records in a reasonably timely manner which contain
     information about: (1) any written communication

                                       29
<PAGE>
 
  received by Chevron from any agency regarding any discharge, spill or release
  of product, (2) notice of any demand, claim or suit regarding same, for which
  HECO may be responsible, and (3) all invoice data and operating/field
  information pertinent to Site Remediation activities which should reasonably
  be documented in monitoring Site Remediation activities.
 
  c) See Definitions for a definition of Site Remediation as described
  above.
 
  d) Chevron shall use reasonable efforts to give HECO access to all Site
  Remediation related meetings and activities and all individuals involved
  therewith.
 
  e) If, at any time, HECO determines that Chevron or its agents should
  discontinue Site Remediation activities, HECO shall so notify Chevron or its
  agent and thereafter Chevron or its agent shall have no right to continue said
  activities at HECO's expense; however such notification shall not affect any
  liability of HECO to Chevron or any third parties, including, but not limited
  to government agencies.
 
  f) The provisions of this Section 5.6 shall survive the termination of this
  contract to the extent they apply to events which occurred during the term of
  this contract.


                ARTICLE 6: Waiau - Barbers Point Steam Exchange

Section 6.1: Facilities

Chevron has facilities at Waiau ("Waiau Reheat Station") to reheat Chevron's and
HECO's fuel oil being transported, respectively, to Chevron's marine terminal at
Honolulu and to HECO's tank field at Iwilei.  HECO has facilities at Waiau
("Waiau Steam System") to provide 6,000 pounds per hour of 60 Pounds Per Square
Inch Absolute ("PSIA") saturated steam to the plot limit of the Waiau Reheat
Station.  HECO and Chevron agree that the Waiau Steam System includes only the
facilities listed in Addendum 6 attached.


Section 6.2: Services

HECO and Chevron agree that HECO shall operate and maintain the Waiau Steam
System and provide steam to Chevron at the steam and condensate flanges at the
plot limit of the Waiau Reheat Station.  HECO shall operate and maintain the
Waiau Steam System in accordance with generally accepted industry practice and
shall provide for the accurate measurement of steam delivered to Chevron.  HECO
will have the capability of delivering to Chevron at the Waiau Reheat Station
6,000 pounds per hour of 60 Pounds Per Square Inch Absolute ("PSIA") saturated
steam at any time upon two hours prior request to HECO.  If at any time HECO is
unable or anticipates it may be unable to deliver the requested steam, it shall
promptly notify Chevron.  HECO shall also provide Chevron at least 72 hours
prior notice of planned outages.  In addition, HECO shall notify Chevron of any
unplanned outages or failure within two hours of such

                                       30
<PAGE>
 
occurrence.  HECO shall not be held liable for any damages to the Waiau Reheat
Station due to any outage, scheduled or unscheduled, where the steam supplied to
the reheat station is terminated.


Section 6.3: Measurement of Chevron's Steam Consumption

Section 6.3.A: Steam Flow Meter Operable

Chevron's steam consumption shall be measured as determined by the Waiau Steam
System steam flow meter.  HECO shall take and record meter readings at the
beginning and the end of each month.  HECO shall transmit monthly readings to
Chevron's Barbers Point Refinery Financial Accounting Department within five
working days of the month's end.  HECO will keep the steam flow charts at Waiau
for 12 months and if requested will send copies to Chevron.  Chevron has the
right to witness HECO's calibration of the Waiau Steam System steam meter and to
receive supporting documentation.


Section 6.3.B: Steam Flow Meter Inoperable

In the event steam is delivered to Chevron at a time when the Waiau Steam System
steam flow meter is malfunctioning, or in the event HECO, in its sole
discretion, chooses not to maintain and operate its Steam Flow Meter, Chevron's
steam usage during that period shall be determined by multiplying the sum of the
total Physical Barrels of LSFO transported to Iwilei during the period of meter
malfunction and the sum of the total Physical Barrels of Warm Up Stock and Line
Displacement Stock that is heated at the Waiau Reheat Station and the total
Physical Barrels of Chevron Industrial Fuel Oil No. 6 ("CIFO") transported to
Chevron's marine terminal at Honolulu during the period of meter malfunction by
7.2 pounds of steam used per Physical Barrel of petroleum product delivered.
Quantities of such LSFO and CIFO shall be submitted to HECO within five working
days from the billing month's end.


Section 6.4: Compensation

Chevron shall compensate HECO for the operation and maintenance of the Waiau
Steam System in the following manner:

     (A)  Low pressure steam shall be exchanged with steam used by Chevron for
          HECO pursuant to Section 5.2.A.(ii).  If HECO provides more steam
          herein than Chevron provides under Section 5.2.A.(ii), HECO may charge
          such excess at the rates set forth in Section 5.2.A (ii).

     (B)  Any costs incurred by HECO for additions or modifications to the Waiau
          Steam System that may be required by Chevron.

                                       31
<PAGE>
 
     (C)  The cost of any complete or partial replacement of the Waiau Steam
          System equipment costing more than $1,000.  Said replacements to be
          approved by Chevron.

     (D)  HECO will issue invoices for the monthly steam costs and the costs for
          the replacements, additions and modifications under Section 6.4 in the
          month following the month in which these costs are incurred. Chevron
          will pay these invoices via Chevron company check which will be issued
          in accordance with Section 9.2.


                 ARTICLE 7: Measurement of Quantity and Quality

Section 7.1: Measurement of Quantity

Quantities of LSFO, Warm Up Stock, and Line Displacement Stock delivered under
this Contract shall be determined at the time of transport by gauging the
following shore tanks before and after such delivery:

     (A)  Quantities delivered from Chevron tanks shall be determined by gauging
          such tanks.

     (B)  Quantities delivered from HECO's tanks or marine vessels shall be
          determined by gauging HECO's tanks.

     (C)  Quantities delivered from HECO's marine vessels into Chevron's tanks
          shall be determined by gauging Chevron's tanks.

For transfers from shore tanks, measurements shall be taken by Chevron or
Chevron's agent and witnessed by HECO or HECO's agent.  However, at HECO's
option, measurements may be taken by a mutually agreed upon Independent
Inspector at both delivery and receiving facilities.  If a mutually agreed upon
Independent Inspector is used, Chevron and HECO shall share equally the cost of
such independent inspections.  For transfers from HECO's vessels, measurements
shall be taken under the supervision of an Independent Inspector, whose costs
shall be for HECO.  Volumes delivered hereunder shall be converted to 60 degrees
F, using the latest revision of ASTM Table 6.


Section 7.2: Determination of Quality

The quality of fuel transported to HECO shall be determined on the basis of
samples drawn in such a manner as to be representative of each individual
transport.  For transfers from shore tanks, samples shall be drawn by Chevron
from the shore tanks prior to transport.  For transfers from HECO's vessels,
samples shall be drawn by or under the supervision of an Independent Inspector,
whose costs shall be for HECO.  Samples shall be divided into two parts.  One
part

                                       32
<PAGE>
 
shall be used by Chevron to determine qualities according to Addendum 2
attached. The other part shall be sealed and retained separately by HECO.


Section 7.3:  Disputes of Quality and Quantity

If Chevron or HECO has reason to believe that the quality or quantity of product
stated for a particular transport per Sections 7.1 or 7.2 is incorrect, that
party shall within sixty days of the transport date, present the other party
with documentation supporting such determination and the parties will confer, in
good faith, on the causes for the discrepancy and shall proceed to correct such
causes and adjust the quality and quantity, if justified, for the transports in
question.


           ARTICLE 8: Line Displacement Stock and Line Warm Up Stock

HECO shall purchase from Chevron the Line Displacement Stock and Line Warm Up
Stock that is required for Chevron to initiate and complete the deliveries of
LSFO and received into HECO's tankage at Kahe, Waiau and Iwilei.  The price of
No. 2 diesel fuel or No. 6 fuel oil used as Line Displacement Stock shall be the
then-current pricing for the fuel comprising the Line Displacement Stock in
Chevron's LSFO Fuel Supply Contract with HECO and HECO's affiliates on a FOB
Refinery basis, if such a supply contract is in effect; otherwise its price
shall be the then-current Honolulu posted price for such fuel, less normally
available discounts, if any, at the time of purchase.  The price of No. 5 fuel
oil used as Line Displacement Stock shall be the sum of 40% of the then-current
No. 2 diesel fuel pricing and 60% of the then-current No. 6 fuel oil pricing in
Chevron's LSFO Fuel Supply Contract with HECO and HECO's affiliates, if such a
supply contract is in effect; otherwise its price shall be the then-current
Honolulu posted price for No. 5 fuel oil, less normally available discounts, if
any, at the time of purchase.

The line displacement and warm up operations shall be performed with Line
Displacement Stock and Warm Up Stock of a sufficiently good quality and in such
a manner that the Line Displacement and Warm Up operations do not result in
noncompliance with the specifications listed in Addendum 2 for the delivered
product that would otherwise be in compliance.


                        ARTICLE 9: Invoicing and Payment

Section 9.1: Invoices

Invoices for the services performed pursuant to Articles 3, 4, 5, and 6 and for
Line Displacement Stock sold will be prepared and dated following delivery and
shall be rendered from time to time each calendar month.  The invoices shall be
supported by such documentation to allow easy verification of the charges
therein.

                                       33
<PAGE>
 
Section 9.2: Payments

Payment of any invoices issued pursuant to this contract shall be made in U.S.
dollars.  Timing of payments of sales and deliveries received shall be based
upon the invoice issue date, which shall be the invoice date or postmarked
mailing date of the invoice, whichever is later, as follows:

     (A)  Payment for a received invoice dated from the 1st through the 10th of
          a month is due on the 20th of the same month.

     (B)  Payment for a received invoice dated from the 11th through the 20th of
          a month is due by the last day of the same month.

     (C)  Payment for a received invoice dated from the 21st through the last
          day of the month is due on the 10th day of the following month.

Due dates are the dates payments are to reach the other party.  If the due date
falls on a Saturday, the payment shall be received on the preceding business
day.  If such date falls on a Sunday or a holiday, payment shall be received the
following business day.


Section  9.3: Method of Payment

Payments shall be by bank wire transfer of immediately available funds to:
                    Chevron Products Company,
                        a division of Chevron U.S.A. Inc
                            Account Number 59-51755
                  First National Bank of Chicago, Chicago, IL
                             ABA Ref. No. 071000013

     For identification purposes, all wires must clearly indicate that payment
     is being made by order of HECO and provide the invoice reference number.
     In addition, written documentation evidencing specific invoices being paid
     shall be immediately forwarded to:

                            Utility Fuel Receivables
                           Chevron Products Company,
                        a division of Chevron U.S.A. Inc
                            P.O. Box 7006, Room 2228
                     San Francisco, California  94120-7006
                              Fax:  (415) 894-1195

                                       34
<PAGE>
 
                               ARTICLE 10: Audits

Section 10.1:   Audits Requiring Non-Confidential Information

On request of HECO, Chevron shall furnish to HECO such full and complete
documentation as HECO reasonably shall require in order to satisfy itself that
data used by Chevron to establish all amounts charged hereunder are accurate.


Section 10.2:   Audits Requiring Confidential Information

Notwithstanding the foregoing, in order to preserve the confidentiality of
certain information not generally available, Chevron may elect to furnish some
or all of such documentation to an independent auditor chosen by Chevron and
HECO.  In such an event, Chevron and HECO shall meet promptly to provide
mutually satisfactory instructions to such auditor as to the facts to be
verified in order to establish the accuracy of data used by Chevron to establish
such charges.  Chevron and HECO shall share equally the cost of such independent
verification of the accuracy of data used by Chevron.


Section 10.3:   Independent Audits Using Non-Confidential Information

In addition to the foregoing, HECO shall have the right to utilize such auditor
at HECO's sole cost and expense to further certify the accuracy of any generally
available information, and the accuracy of any and all amounts charged hereunder
providing such auditor shall continue to be under the duty to Chevron to
preserve the confidentiality of information furnished to it by Chevron.


Section 10.4:   Adjustments From Audit Findings

Any findings of inaccuracies from the audits under Sections 10.1 and 10.3,
including but not limited to billings, shall be resolved between the parties by
negotiation, and failing resolution by arbitration, and appropriate adjustments
to the charges shall be made.  Any findings of inaccuracies from the audits
under Section 10.2 shall be accepted by the parties and appropriate adjustments
to the charges shall be made.


                           ARTICLE 11: Contingencies

Section 11.1: Definition of Contingency

As used in this Article 11, the term "contingency" means:

     (A)  any event reasonably beyond the control of the party affected;

                                       35
<PAGE>
 
     (B)  compliance, voluntary or involuntary, with a direction or request of
          any government or person reasonably evidencing to act with
          governmental authority; including that limiting HECO's recovery of all
          fuel costs incurred under this Contract;

     (C)  total or partial expropriation, nationalization, confiscation,
          requisitioning or abrogation or breach of a government contract or
          concession;

     (D) closing, or restriction on the use of, a port or pipeline;

     (E)  maritime peril (including but not limited to, negligence in navigation
          or management of vessel, collision, stranding, destruction, or loss of
          vessel), storm, earthquake, flood;

     (F)  accident, fire, explosion;

     (G)  hostilities or war (declared or undeclared), embargo, blockage, riot,
          civil unrest, sabotage, revolution, insurrection;

     (H)  strike or other labor difficulty (whomsoever's employees are
          involved), even though the strike or other labor difficulty could be
          settled by acceding to the demands of a labor group;

     (I)  loss or shortage of production, manufacturing, power generation or
          distribution, transportation, delivery or receiving facilities,
          equipment, labor or material caused by circumstances not due to the
          affected party's lack of diligence.


Section 11.2: Relief of Obligations

Any obligation of either party under this Contract shall be excused only to the
extent and for the period that such party's inability to perform is caused by a
contingency event. The party so excused shall make all reasonable efforts,
including all reasonable expenditures of necessary funds to cure, mitigate, or
remedy a contingency event.  Any payment due as compensation for the obligation
so excused shall also be excused to the extent and for so long as the obligation
is not performed due to a contingency event.


Section 11.3: Pricing Affected By Government Direction

If at any time any price determined under this Contract cannot be given effect
because to do so would violate a direction or request of any government or
person acting with government authority, HECO and Chevron shall attempt to agree
on an alternate course of action but failing agreement within 10 days the party
adversely affected may suspend performance with respect to the services or use
of facilities affected by the direction or request.

                                       36
<PAGE>
 
Section 11.4  Event of Sale or Cessation of Chevron's Operations

Chevron shall have the right to terminate this Contract in the event :

        1.   The ownership and operation of its refining and delivery facilities
             in Hawaii are transferred to an entity other than an affiliate; or

        2.   Chevron ceases Crude Unit Distillation operations at its Refinery
             or products delivery systems in Hawaii.

Chevron shall give Buyer 6 months written notice of its change in obligation due
to the contingencies in this Section 11.4.


Section 11.5  Event of Sale or Cessation of  HECO's Operations

HECO's obligations under this Contract shall be contingent and HECO shall have
the right to terminate this Contract in the event :

        1.   The ownership and operation of its power generation or its power
             delivery facilities in Hawaii are transferred to an entity other
             than an affiliate; or

        2.   HECO ceases operations at its electrical power plants at Waiau and
             Honolulu.

HECO shall give Buyer 6 months written notice of its change in obligation due to
the contingencies in this Section 11.5 .


                 ARTICLE 12: Effect of Suspension or Reduction

Section 12.1: Notice of Suspension or Reduction

Any party which relies upon Sections 11.1 through 11.3 shall give the other
party prompt notice thereof specifying the anticipated amount and duration of
any suspension or reduction of services provided or received, or the use of
facilities.  It shall also give prompt notice when it no longer expects to rely
on Sections 11.1 through 11.3, and services provided or received and use of
facilities shall be reinstated subject to all conditions of this Contract,
unless this Contract has been terminated previously in accordance with this
Contract.

                                       37
<PAGE>
 
Section 12.2: Chevron's and HECO's Rights During Suspension or Reduction

While services or the use of facilities are suspended or reduced by one party
pursuant to Sections 11.1 through 11.3, it shall not be a breach of this
Contract for the other party to use the services or facilities of a third party.
After any suspension or reduction has ended, there shall be no obligation on
either party to make up for the services or facility usage not provided or used
during the suspension or reduction.


Section 12.3: Termination Rights

If services and the use of facilities are suspended under Article 11 for more
than 180 days, HECO or Chevron shall then have the option while such suspension
continues to terminate its obligations to the other party under this Contract on
30 Days notice to the other party.


Section 12.4: Payment for Services and Facility Usage Provided

Nothing in Sections 11.1 through 11.3 nor Section 12.3 shall relieve HECO or
Chevron of the obligation to pay in full in United States currency for the
services and the use of facilities actually provided hereunder and for other
amounts due by one party to the other under this Contract.


                    ARTICLE 13: Waiver and Non-Assignability

Section 13.1: Waiver

Waiver by one party of the other's breach of any provision of this Contract
shall not be deemed a waiver of any subsequent or continuing breach of such
provisions or of the breach of any other provision or provisions hereof.


Section 13.2: Non-Assignability

This Contract shall not be assignable by either party without the written
consent of the other, which shall not be unreasonably withheld, except that
either party may assign this Contract to any affiliate, provided that any such
assignment shall not release that party from any of its obligations hereunder,
and except that HECO may assign this Contract to the Trustee under its First
Mortgage Bond Indentures. Neither party, by agreement to such an assignment,
waives any right it may have to terminate this Contract for any breach hereof
occurring at any time before or after any such assignment or release the other
party of any obligations arising under this Contract after any such assignment.
Following any such assignment, no further assignment may be made without the
consent of Chevron.

                                       38
<PAGE>
 
Section 13.3: Definitions

In Articles 13, l5 and 17, "affiliate" shall mean any corporation controlling,
controlled by or under common control, with either Chevron or HECO.  "Control"
of a corporation shall mean ownership, directly or indirectly, of at least 50%
of the voting shares of such corporation.


                              ARTICLE 14: Default

Section 14.1: Default

If HECO or Chevron considers the other party to be in default in any obligation
under this Contract, such party shall give the other party notice thereof.  Such
other party shall then have 30 Days in which to remedy such default.  If the
default is not cured, the other party may, without prejudice to any other right
or remedy of such party in respect of such breach, terminate its obligations
under this Contract by 45 Days notice to the party in breach.  Any termination
shall be without prejudice to accrued rights.  All rights and remedies hereunder
are independent of each other and election of one remedy shall not exclude
another.  In no event shall either party be liable for prospective profits or
special, indirect or consequential damages.


Section 14.2: Termination Rights

If one party fails to perform any obligation under Articles 3, 4, 5 and 6 of
this Contract, and such failure is not cured within 30 Days after written notice
thereof is given by the other party, the other party may give notice to the
first party terminating the parties' rights and obligations under those Articles
immediately.


                        ARTICLE 15: Conflict of Interest

Conflicts of interest related to this Contract are strictly prohibited.  Except
as otherwise expressly provided herein, neither party nor any director, employee
or agent of a party shall give to or receive from any director, employee or
agent of the other party any gift, entertainment or other favor of significant
value, or any commission, fee or rebate.  Likewise, neither party nor any
director, employee or agent of a party shall enter into any business arrangement
with any director, employee or agent of the other party or any affiliate, unless
such person is acting for and on behalf of the other party, without prior
written notification thereof to the other party.

In the event of any violation of this Article 15, including any violation
occurring prior to the date of this Contract which resulted directly or
indirectly in one party's consent to enter into this Contract with the other
party, such other party may at its sole option terminate this Contract at any
time and, except for obligations to pay in full in United States currency for
the outstanding payment obligations hereunder, shall be relieved of any further
obligation under this Contract.

                                       39
<PAGE>
 
Both parties agree to immediately notify the other of any known violation of
this Article.


                           ARTICLE 16: Applicable Law

This Contract shall be construed in accordance with, and all disputes arising
hereunder shall be determined in accordance with, the local law of the State of
Hawaii, U.S.A.


                             ARTICLE 17: Indemnity

Section 17.1   HECO indemnifies Chevron

[---]

        (i)    [---] 
        (ii)   [---]
        (iii)  [---]
        (iv)   [---] 

[---]


Section 17.2  Chevron imdenifies HECO

[---] Chevron agrees to release, defend indemnify and hold harmless, HECO and
its officers, directors, agents, employees and invitees from and against

                                       40
<PAGE>
 
all claims, losses, damages, expenses, costs and liability (including attorneys
fees and costs of litigation), including without limitation for injuries to or
deaths of persons or damage to property (including LSFO, its components, Line
Displacement Stock, Warm Up Stock, risk of loss which is in HECO), but excluding
consequential damages or punitive damages (other than punitive damages actually
paid by HECO to a third party), arising or resulting from or related in any
manner whatsoever to:

(i)   the operation and maintenance of the Pipelines, BPTF and Marine Facilities
      by Chevron hereunder, to the extent such claims, losses, damages,
      expenses, costs and liability, including without limitation for injuries
      to or deaths of persons or damage to property (including LSFO, its
      components, Line Displacement Stock, Warm Up Stock, risk of loss which is
      in HECO), are caused by the negligence or willful misconduct of,
      respectively, Chevron, or its officers, directors, agents, employees and
      invitees,

(ii)  any loss, release, discharge, spill, or threat thereof, of any petroleum
      product for which Chevron has risk of loss, occurring from any leak, or
      other incident except to the extent such claims, losses, damages,
      expenses, costs and liability, including without limitation for injuries
      to or deaths of persons or damage to property (including LSFO, its
      components, Line Displacement Stock, Warm Up Stock, risk of loss which is
      in HECO), are caused by the gross negligence or willful misconduct of,
      respectively, HECO, or its officers, directors, agents, employees and
      invitees,

(iii) any LSFO, its components, Line Displacement Stock, Warm Up Stock, the risk
      of loss of which is with Chevron), which does not meet specifications or
      is contaminated, except to the extent such off spec or contaminated
      products, claims, losses, damages, expenses, costs and liability,
      including without limitation for injuries to or deaths of persons or
      damage to property (including LSFO, its components, Line Displacement
      Stock, Warm Up Stock, risk of loss which is in HECO), are caused by the
      gross negligence or willful misconduct of, respectively, HECO, or its
      officers, directors, agents, employees and invitees, or

(iv)  any LSFO, its components, Line Displacement Stock, Warm Up Stock, the risk
      of loss of which is with HECO, which does not meet specifications or is
      contaminated, to the extent such off spec or contaminated products,
      claims, losses, damages, expenses, costs and liability, including without
      limitation for injuries to or deaths of persons or damage to property
      (including LSFO, its components, Line Displacement Stock, Warm Up Stock,
      risk of loss which is in HECO), are caused by the negligence or willful
      misconduct of, respectively, Chevron, or its officers, directors, agents,
      employees and invitees.

HECO agrees to promptly notify Chevron of any claim, loss, cost, damages,
expense or liability and to provide Chevron reasonable information and
assistance related to any claim or action of the defense thereof.

                                       41
<PAGE>
 
Section 17.3   Provision Survival

The provisions of this Article 17 shall survive the termination of this Contract
to the extent that they apply to events which occurred during the term of this
contract.


                     ARTICLE 18: Public Utility Commission

Section 18.1  Approval

This Contract is required to be filed with the Hawaii Public Utilities
Commission ("PUC") for approval.  If in the proceedings initiated as a result of
the filing of this Contract the PUC disapproves or fails to authorize the full
recovery of the fuel costs incurred under this Contract through HECO's "Energy
Cost Adjustment Clause", HECO may terminate this Contract by 30-days' written
notice to Chevron.


Section 18.2   Use as a Public Utility.

No use of the pipelines, facilities or equipment owned by Chevron and used in
connection with this Agreement shall be construed as having been dedicated by
Chevron to a public use and it is hereby acknowledged by the parties that
Chevron retains the exclusive right to determine who other than the parties to
this agreement shall use said pipelines, facilities, and equipment.


                           ARTICLE 19: Miscellaneous

Section 19.1: Headings

Headings of the Articles and Sections are for convenient reference only and are
not to be considered part of this Contract.


Section 19.2: Entire Agreement

This document contains the entire agreement between the parties covering the
subject matter and cancels, as of the effective date hereof, all prior
agreements of any kind between the parties covering such subject matter and any
amendments thereto.  There are no other agreements which constitute any part of
the consideration for, or any condition to, either party's compliance with its
obligations under this Contract.

                                       42
<PAGE>
 
Section 19.3: Contract is Not an Asset

This Contract shall not be deemed to be an asset in, and, at the option of a
party, shall terminate in the event of any voluntary or involuntary
receivership, bankruptcy or insolvency proceedings affecting the other party.


Section 19.4: Notices

Except as otherwise expressly provided herein, all notices shall be given in
writing, by letter, facsimile, or electronic mail, to the following addresses,
or such other address as the parties may designate by notice, and shall be
deemed given upon receipt.

               Chevron:  Manager, Petroleum Coke, Heavy Fuels & Sulfur
                         Chevron Products Company,
                         a division of Chevron U.S.A. Inc
                         P.O. Box 7006
                         San Francisco, CA  94120-7006
                         Facsimile:  (415) 894-1195

               HECO:     Manager, Power Supply Services Department
                         Hawaiian Electric Company, Inc.
                         Box 2750
                         Honolulu, HI  96840-0001
                         Facsimile:  (808) 543-7788


Section 19.5:  Severability

If any term or provision, or any part of any term or provision, of this Contract
is held by any court or other competent authority to be illegal or
unenforceable, the remaining terms, provisions, rights and obligations shall not
be affected.


Section 19.6:  Successors and Assigns

This Contract shall inure to the benefit of and be binding upon the parties
hereto, their successors and permitted assigns.


Section 19.7:  Consequential Damages

In no event shall either party be liable for any indirect, consequential,
special or incidental damages of any kind whether based in contract, tort
(including without limitation negligence or strict liability), warranty or
otherwise.

                                       43
<PAGE>
 
Section 19.8:  Termination of Prior Agreement

As of the Effective Date, this Contract hereby supersedes that certain
Facilities and Operating Contract between the parties dated November 20, 1995,
and all amendments thereto.

     IN WITNESS WHEREOF, the parties hereto have executed this Facilities and
Operating Contract dated as of the date first herein above written.


CHEVRON PRODUCTS COMPANY,                           HAWAIIAN ELECTRIC
A DIVISION OF CHEVRON U.S.A. INC                    COMPANY, INC.



By:    /s/ Phillip H. Fisher                    By: /s/ Edward Y. Hirata
     -----------------------                       ----------------------

     Phillip H. Fisher                                  Edward Y. Hirata
                                                     ----------------------
                                                    (Printed or Typed Name )

 Its Manager, Petroleum Coke,                 Its:   Vice President,
     Heavy Fuels & Sulfur                           --------------------
                                                      Regulatory Affairs



                                              By:  /s/ Marvin A. Hawthorne
                                                   -----------------------

                                                    Marvin A. Hawthorne 
                                                    -------------------
                                                   (Printed or Typed Name )

                                              Its:   Assistant Treasurer
                                                    ---------------------

                                       44
<PAGE>
 
                                   ADDENDUM 1

               Adjustment Factors for Adjustable Charges and Fees


The various adjustable charges and fees of Articles 3, 4, 5, and 6 of this
Contract shall be adjusted as described therein based on the following factors.


     Section l:  Labor Adjustment, "An"
     ----------------------------------

The labor adjustment factor, An, shall be defined as:

The arithmetic average of the hourly earnings in dollars per hour for the
petroleum and coal products industry as shown in the "Employment and Earning"
publication of the U.S. Department of Labor, Bureau of Labor Statistics, for the
three months of the second calendar quarter immediately preceding the calendar
quarter of the month in which services are rendered, divided by the arithmetic
average of the hourly earnings in dollars per hour for the petroleum and coal
products industry as shown in the "Employment and Earning" publication of the
U.S. Department of Labor, Bureau of Labor statistics, for the months  October
through December 1996 (19.76).


     Section 2:  Industrial Commodities Adjustment, "Bn"
     ---------------------------------------------------

The industrial commodities adjustment factor, Bn, shall be defined as:

The arithmetic average of the Producer Price Index (PPI) for Industrial
Commodities as published by the U.S. Department of Labor, Bureau of Labor
Statistics, for the three months of the second calendar quarter immediately
preceding the calendar quarter of the month in which services are rendered,
divided by the arithmetic average of the Producer Price Index (PPI) for
Industrial Commodities as published by the U.S. Department of Labor, Bureau of
Labor Statistics, for the months  October through December 1996 (128.0)


     Section 3:  Fuels and Power Adjustment, "Cn"
     --------------------------------------------

The fuels and power adjustment factor, Cn, shall be defined as:

The arithmetic average of the Producer Price Index (PPI) for Fuels and Power
(Code 5), as published by the U.S. Department of Labor Bureau of Labor
Statistics, for the three months of the second calendar quarter immediately
preceding the calendar quarter of the month in which services are rendered,
divided by the arithmetic average of the Producer Price Index (PPI) for Fuels
and Power (Code 5), as published by the U.S. Department of Labor, Bureau of
Labor Statistics, for the months  October through December 1996 (88.9).

                                       45
<PAGE>
 
                                   ADDENDUM 2

                                    Quality


The LSFO transported hereunder shall be analyzed for the following qualities.
HECO's LSFO specifications are shown for reference.

<TABLE>
<CAPTION>  
                                                  HECO Reference
                        ASTM Test                 Specification
LSFO specification       method        Units          Limits
- ------------------      ---------      -----      --------------
<S>                     <C>         <C>           <C>
 
API Gravity               D4052        Deg            12 min
                                                      24 max
 
Sulfur                    D4292        Wt %          0.50 max
 
Flash Point (1)            D93        Deg F          150 min
 
Pour Point                 D97        Deg F          125 max
 
Viscosity                 D445        SSU at         l00 min
                                    210 Deg F        450 max
 
Ash                       D482         Wt %          0.05 max
 
Gross Heating             D240      MM BTU/Bbl      6.000 min
  Value
 
Nitrogen                  D4629        Wt %          0.50 max
 
Water & Sediment          D1796        Wt %          0.50 max
</TABLE>
Note: (1) Flash point shall be at least 50 degrees F above the pour point or
150 degrees F, whichever is greater.

                                       46
<PAGE>
 
                                   ADDENDUM 3

                     Chevron's Mooring and Submarine Lines


1.   Geographical Description of Mooring Area

     Chevron U.S.A. Inc., Hawaiian Refinery has been granted the use of the
     following anchorage for its Barbers Point Offshore Tanker Terminal:

          The waters of the Pacific Ocean within an area beginning at a point in
          latitude 21 degree 16' 58" N and longitude 158 degree 04' 39" W,
          thence on a bearing of 090 degree true, 850 yards, thence on a bearing
          of 180 degree true, 450 yards, thence on a bearing of 270 degree true,
          850 yards, thence on a bearing of 000 degree true, 450 yards to the
          point of beginning.

     The center of the above described area is on an "approximate" bearing of
     119 degree true, 2.3 miles from the Barbers Point light. Four corners of
     the area are marked by buoys. The two southerly corners of the area are
     marked by lighted buoys which are painted yellow and are in 84 feet of
     water. The northerly corners of the area are marked by a white spar buoys
     and are in 66 feet of water. The northwesterly corner of the area is
     unmarked. The area is designated as area "C" on the chart attached hereto
     this Addendum 3.

     Within the mooring area, there are seven mooring buoys.  Vessels moor by
     using the ship's bow anchors and by running lines to the mooring buoys.

                                       47
<PAGE>
 
                                 ADDENDUM 4



The terms and conditions of that certain "Chevron Products Company Hawaii
Refinery Marine Terminal Manual for Barbers Point Offshore Tanker Terminal,
Oahu,  Hawaii (revised June 1997)"  and as hereinafter revised from time to
time, are hereby incorporated herein by reference and made a part hereof.

                                       48
<PAGE>
 
                                   ADDENDUM 5

                    List of Facilities in HECO's BPTF System
                    and Chevron's Tank Field Support System


Section 1:  HECO's Facilities

  1)   Three LSFO storage tanks.

  2)   Two LSFO feeder pumps (main and spare) with electric drivers.

  3)   Jet mixing facilities for all LSFO tanks using feeder pumps as motive
       force.

  4)   Internal tank heaters -- pancake coil tank heaters using low pressure
       steam.

  5)   Tank Gauging System -- compatible with and connected to Chevron's
       Refinery tank gauging system.

  6)   Storm Water Drainage System -- gravity drainage system to drain storm
       water to Chevron's Refinery tank field impounding basin.

  7)   Single dike for area and gravity drainage system to drain a major oil
       spill to Chevron's Refinery tank field impounding basin.

  8)   Lighting System

  9)   Fire Fighting System -- consisting of a looped waterline extending from
       Chevron's Refinery tank field fire water system.

  10)  Electrical Substation and Electrical Distribution System

  11)  Steam Systems -- nominal 40 psig system to supply tank heating coils,
       steam tracing system and exchangers.

  12)  Condensate System -- collection and pumping system to recover and
       return 100 percent of condensate to Chevron's Refinery condensate system.

  13)  Related Piping Systems --

       a) LSFO -- steam traced and insulated lines needed to receive LSFO into
          tank field, transfer LSFO from tank to tank, and transfer LSFO to
          Chevron's Pipeline booster pumps.

       b) Steam and Condensate -- insulated steam and condensate pipelines.

                                       49
<PAGE>
 
14)    Related Pipeline Systems -- that section of pipeline which is connected
       to BHP, Inc. or other facilities and falls within the legal boundaries of
       HECO's BPTF.



Section 2:  Chevron's Tank Field Support System

  1)   Low Pressure Steam System -- insulated supply line with valves and meter
       routed from Chevron's Refinery low pressure steam system to HECO's tank
       field plot limit.

  2)   Condensate System -- insulated condensate line with valves routed from
       HECO's tank field plot limit to Chevron's Refinery condensate system.

  3)   Fire Water System -- two supply lines with valves routed from Chevron's
       Refinery tank field fire water system to HECO's tank field plot limit for
       HECO's looped fire water system.

  4)   Storm Water Drainage System -- system is routed via gravity to Chevron's
       Refinery tank field impounding basin.

  5)   Tank Gauging System -- signals from HECO's tank gauging system are routed
       to and connected into Chevron's Refinery tank field control house tank
       gauging system.

  6)   LSFO Receiving Line -- steam traced and insulated line with valves routed
       from Chevron's marine unloading line to HECO's tank field plot limit.

  7)   LSFO Delivery Line -- steam traced and insulated line with valves routed
       from HECO's plot limit to Chevron's pipeline booster pumps' suction
       manifold.

                                       50
<PAGE>
 
                                   ADDENDUM 6

                List of Facilities in HECO's Waiau Steam System


  1)      Steam Piping -- insulated piping from HECO's Waiau Unit No. 7 and No.
          8 reboiler steam system to the plot limit of Chevron's Waiau Reheat
          Station

  2)      Condensate Inspection Tank

  3)      Two Condensate Drip Pumps

  4)      Steam Flow Meter

  5)      Miscellaneous -- pipeline valves, instrumentation and fittings

                                       51
<PAGE>
 
                                   APPENDIX 1

               Chevron's and HECO's Fuel Oil Distribution Systems

                                       52
<PAGE>
 
CHEVRON'S AND HECO'S FUEL OIL DISTRIBUTION SYSTEMS (map)

                                     52ii
<PAGE>
 
TRANSITION FROM REFINERY TO HECO BPTF LSFO TITLE TRANSFER POINT A (diagram)

                                     52iii
<PAGE>
 
TRANSITION FROM REFINERY TO KAHE PIPELINE LSFO TITLE TRANSFER POINT B (diagram)

                                     52iv
<PAGE>
 
TRANSITION FROM REFINERY TO BLACK OIL PIPELINE - LSFO TITLE TRANSFER POINTS AND
LINE DISPLACEMENT/WARM-UP OIL RISK OF LOSS (diagram)

                                      52v
<PAGE>
 
TRANSITION FROM BLACK OIL PIPELINE TO WAIAU POWER PLANT DISPLACEMENT TITLE
TRANSFER POINT D (WAIAU POWER PLANT) (diagram)

                                     52vi
<PAGE>
 
TRANSITION FROM BLACK OIL PIPELINE TO HECO IWILEI TANK FIELD TITLE TRANSFER
POINT D (AT IWILEI TANK FIELD) (diagram)

                                     52vii
<PAGE>
 
TRANSITION FROM BLACK OIL PIPELINE TO HMT - LINE DISPLACEMENT AND WARM UP OIL
RISK OF LOSS TRANSFER POINT E (diagram)

                                    52viii
<PAGE>
 
                                   APPENDIX 2

                Summary of Vessel Requirements at Barbers Point


A. Maximum Deadweight Tons - 150,000

B. Maximum Length Overall - 1,000 feet

C. Maximum Draft - 50 feet (a maximum draft of 52 feet may be allowed from about
   April through about October)

D. Maximum Distance Stern to Center Manifold - 500 feet.



                              GENERAL REQUIREMENTS

E. No cast iron is permitted in vessel's riser valves, pipes and fittings
   outboard of the last fixed rigid support to the deck.

F. Vessel's port side manifold piping, valves and ancillary equipment necessary
   to retrieve, secure and release the submarine cargo transfer hose(s), shall
   be in accordance with the latest edition of the Oil Companies International
   Marine Forum, OCIMF, Standards for Oil Tanker Manifolds and Associated
   Equipment, which shall be an integral part of this agreement.

G. All ground tackle must be in good working condition.  Vessels up to 50,000
   DWT shall have at least l0 shots of chain on each anchor.  Vessels over
   50,000 DWT shall have at least 12 shots of chain on each anchor.
 
H. Vessels should be equipped with a searchlight on each bridge wing to assist
   in illuminating buoys during mooring and unmooring at night.

I. Handling of the submarine cargo transfer hose(s) shall be performed by the
   vessel's crew under the supervision of a ship's officer as designated by the
   vessel's master, as directed by the Chevron's Mooring Master in attendance.

J. All vessels shall comply with regulations and procedures set forth in the
   Marine Terminal Manual for Barbers Point Offshore Tanker Terminal in Oahu,
   Hawaii in its latest revision, in addition to U.S. Coast Guard and other
   government regulations.  Vessels shall comply with all additions and
   revisions to the regulations and procedures in the Marine Terminal Manual
   upon sixty days' written notice or whatever shorter notice is required to
   comply with a mandate by government authority.

                                      53
<PAGE>

K. All vessels are subject to inspection by Chevron upon arrival to determine
   their suitability for the berth.  Vessels not meeting the standard
   requirements in the Marine Terminal Manual for Barbers Point Offshore Tanker
   Terminal in Oahu Hawaii, may be refused for berthing.

L. Vessels may be required to unberth and/or otherwise incur delay during
   adverse weather conditions.  All costs, expenses, etc., or unberthing and
   reberthing shall be to the vessel's or HECO's account as the case may be.

M.  All vessels must have the capability of maintaining at least 30% of vessels
DWT at all times while in the berth.


N.  Only uncontaminated SBT Ballast may be discharged to sea after a visual
inspection of its surface has verifes\ d its integrity.

O. Vessels shall be equipped with seven (7) mooring wires, l000 feet in length
   and mounted on winches.  For vessels up to 70,000 DWT, the wire breaking
   strength shall be at least 65 metric tons; for vessels over 70,000 DWT, the
   breaking strength shall be least 75 metric tons.  If vessel's wires are used
   in combination with synthetic tails (pendants), these shall be in good
   condition and have a breaking strength at least equal to l.25 times that of
   the wire they serve.  In addition, vessels shall be equipped with at least
   seven (7) synthetic mooring ropes, 720 feet in length, in good condition and
   with a nominal breaking strength of 75 metric tons.  Synthetic mooring ropes
   should be made of polyester fiber or equivalent  Polypropylene and nylon
   ropes are not acceptable.


P. Winches and fittings must be so placed that mooring wires and synthetic lines
   can be run as follows:


<TABLE>
<CAPTION>
                                  Port             Center                   Stbd
<S>                              <C>               <C>                     <C> 
Main deck fwd                    l each                                    l each
Main deck aft                    l each                                    l each
Poop deck                        l each            l each                  l each
</TABLE>


  Each synthetic rope shall be secured to a separate bitt using both horns of
  the bitt.


  Winch arrangements shall be such that port and starboard mooring wires/ropes
  may be handled simultaneously.

                                      54
<PAGE>
 
Q. Portside hose boom and related equipment shall have a minimum safe working
   load capacity of ten long tons   The vessel's hose boom and cargo manifold
   must be able to connect to one 12" over-the-rail hose.  Hose boom topping
   life and runner must be of wire line and not synthetic line.

                                      55
<PAGE>
 
                                 APPENDIX 3

                 Refinery Operating Standards and Instructions
                              - - - - - - - - - -

A.  Operating Standards
    -------------------

    H-4210 - Operation of the Main Pumphouse - Included by reference in H-4210
    are:

         AR-9000 - General Operating Instructions

         AR-9060 - Sampling Oil

         AR-9209 - Breaking Lines

         AR-9220 - Operation of Tanks

         AR-9230 - Gauging Tanks

         AR-9240 - Cleaning Tanks

         AR-9410 - General Pumping Instructions

         AR-9422 - Operation of Centrifugal Pumps and Drivers

         AR-9920 - Safe Practices for Entering and Working in Enclosed Equipment

         AR-9510 - Care and Operation of Refinery Sewers and Draining Systems

         AR-9249 - Precautions in Repairing Tanks

         AR-9900 - Release of Operating Equipment for Mechanical Work

         AR-942l - Care and Operation of Reciprocating Pumps

         H-4050  - Operation of Electrical Distribution System

         AR-9070 - Static Electrical and Lightning Protection

         AR-9710 - Operation of Metering and Control Equipment

         H-9510  - Operation of Drainage and Effluent Treating Systems

B.  Refinery Instructions
    ---------------------

    Ref. Inst. No. 3 - Refinery Security

    Refinery Inst. No. 80 - Good Housekeeping

C.  Emergency Plans and Procedures - Emergency Fire Organization
    --------- ----- --- ----------   --------- ---- ------------

D.  Engineering (Maintenance) Instructions
    ----------- ------------- ------------

    All instructions directly applicable to tank field and pipeline maintenance
    work.

                                      56

<PAGE>
 
                                                              HECO Exhibit 10.11
                                                              ------------------





                      LOW SULFUR FUEL OIL SUPPLY CONTRACT



                                 by and between



                      BHP PETROLEUM AMERICAS REFINING INC.


                                      and


                        HAWAIIAN ELECTRIC COMPANY, INC.


                                * * * * * * * *
<PAGE>
 
                               TABLE OF CONTENTS
<TABLE>
<CAPTION>

                                 ARTICLE                                PAGE
<S>               <C>                                                   <C>

ARTICLE I:         Definitions                                             1
ARTICLE II:        Agreement                                               5
ARTICLE III:       Term                                                    5
ARTICLE IV:        Product & Quality                                       5
ARTICLE V:         Quantity                                                6
     Section 5.1:  Quantity                                                6
     Section 5.2:  Reallocation of Deliveries                              8
ARTICLE VI:        Price                                                   8
     Section 6.1:  Determination of Product Price                          8
     Section 6.2:  Taxes, Assessments, Levies and Imposts                 12
ARTICLE VII:       Delivery                                               13
     Section 7.1:  Notification and Product Delivery                      13
     Section 7.2:  Delivery Ratability                                    14
     Section 7.3:  Purchase Deficit                                       15
     Section 7.4:  Failure to Supply                                      16
     Section 7.5:  Pipeline Delivery                                      16
     Section 7.6:  Marine Delivery                                        20
     Section 7.7:  Title and Risk of Loss                                 23
     Section 7.8:  Dispute                                                24
ARTICLE VIII:      Payment                                                25
     Section 8.1:  Invoices                                               25
     Section 8.2:  Method of Payment                                      26
     Section 8.3:  Payments                                               27
     Section 8.4:  Interest                                               27
ARTICLE IX:        Notices                                                28
ARTICLE X:         [---]                                                  28
ARTICLE XI:        Force Majeure                                          30
     Section 11.1: Force Majeure                                          30
     Section 11.2: Obligations Suspended                                  30
     Section 11.3: Notice of Force Majeure                                30
     Section 11.4: No Make-Up Requirement                                 31
ARTICLE XII:       Price and Allocation Controls                          31
     Section 12.1: Regulatory Price Suspension                            31
     Section 12.2: Government Regulations                                 32
ARTICLE XIII:      Assignment                                             32
ARTICLE XIV:       Applicable Law                                         33
ARTICLE XV:        Public Utilities Commission                            33
ARTICLE XVI:       Entire Agreement, Waiver and Illegality                33
ARTICLE XVII:      Indemnity                                              34
ARTICLE XVIII:     Default                                                35

</TABLE> 
                                      ii
<PAGE>
 
<TABLE> 
<CAPTION> 

<S>                <C>                                                   <C> 
ARTICLE XIX:       Counterparts                                           36
EXHIBIT A:         Product Specifications                                 A-1
EXHIBIT B:         Illustrative Schedule of Prices                        B-1
EXHIBIT C:         Example Determination of Freight Components Pursuant
                   to Article VI                                          C-1

</TABLE> 
                                      iii
<PAGE>
 
                      LOW SULFUR FUEL OIL SUPPLY CONTRACT
                      -----------------------------------

     This Contract is made and entered into this 14th day of November, 1997, by
and between BHP PETROLEUM AMERICAS REFINING INC., a corporation duly
incorporated under the laws of the State of Hawaii, having its principal place
of business at 733 Bishop Street, Honolulu, Hawaii 96813, (hereinafter called
"SELLER"), and HAWAIIAN ELECTRIC COMPANY, INC., a corporation duly incorporated
and authorized to do business under the laws of the State of Hawaii, having its
principal place of business at 900 Richards Street, Honolulu, Hawaii,
(hereinafter called "BUYER").

     NOW, THEREFORE, the parties agree as follows:
     
                                   ARTICLE I

                                  DEFINITIONS
                                  -----------

     Except where otherwise indicated, the following definitions shall apply
throughout this Contract:

1.  "Additional Term" means any Contract term in addition to and after the
    Original Term, each of which is a 12-Month period beginning January 1.

2.  "API" means American Petroleum Institute, a long-established petroleum
    industry organization.

3.  "ASTM" means the American Society for Testing and Materials, a long-
    established source of standard testing and evaluation methods for petroleum.

4.  "barrel" means 42 United States Gallons at 60 degrees Fahrenheit.

                                       1
<PAGE>
 
5.  "BPTF" means BUYER's Barbers Point Tank Farm petroleum storage and
    distribution facilities located in the Barbers Point area of Oahu, in
    Campbell Estate Industrial Park, Kapolei, Hawaii.

6.  "BTU Content" means British Thermal Unit content and refers to the standard
    assessment of gross heat of combustion, gross heating value or gross heat
    content of Product determined in accordance with the test method specified
    in Exhibit A.

7.  "Certificate of Quality" means the formal document recording SELLER's
    laboratory determination of quality and BTU Content of a particular sample
    which represents a specific Delivery of Product, said laboratory
    determinations having been performed in accordance with the test methods
    specified in Exhibit A.

8.  "Contract" means this Low Sulfur Fuel Oil Supply Contract, between BHP
    Petroleum Americas Refining Inc. and Hawaiian Electric Co., Inc., the term
    of which commences January 1, 1998.

9.  "Day" or "Days" means a calendar day of 24 hours.

10. "Deliver," "Delivery," "Deliveries," or "Delivered" refers to the physical
    movement of Product or transfer of title attendant upon the sale of Product
    by SELLER and its receipt and purchase by BUYER which commences at the
    initiation of pumping from SELLER's refinery tank(s), nominated issuing
    tank(s) or vessel to BUYER's BPTF and ends with the subsequent cessation of
    continuous pumping of the Product.

11. "DF" means degrees Fahrenheit.

12. "Force Majeure" means an act or event as per the provisions of Section 11.1.

13. "G.S.V." means gross standard volume in U.S. barrels at 60 degrees
    Fahrenheit.

                                       2
<PAGE>
 
14. "Independent Inspector" means a qualified third-party petroleum inspection
    contractor acceptable to both BUYER and SELLER providing petroleum sampling,
    measurement, quantity determination and other such services before, during
    and after a Delivery of Product.

15. "LSFO" means low sulfur fuel oil of a quality generally consistent with that
    of Product as specified in Exhibit A.

16. "LSWR" means Low Sulfur Waxy Resid, mixed/cracked quality, a common grade of
    low sulfur fuel oil typically sold in Singapore, Indonesia and elsewhere in
    the Far East.

17. "Marine Delivery" or "Marine Deliveries" means a Delivery of Product and/or
    the constituents and components thereof, including blend stock, all or part
    of which are Delivered by SELLER from a marine vessel into BUYER's receiving
    pipelines, facility and storage tanks at BPTF.

18. "Month" means a calendar month.

19. "Month-To-Date Ratable" means a rate of sales, Deliveries, invoicing,
    receipts or purchases of Product equivalent to BUYER's cumulative
    Nominations as of a specified Day in a Month where said sales, Deliveries,
    invoices, receipts or purchases for the Month which includes the specified
    Day are calculated by (1) determining the Monthly rate of ratability by
    dividing the Month's aggregate Nomination amount by the number of Days in
    that specified Month and (2) multiplying by the number of Days in that Month
    up to and including the specified Day.

20. "Nominate," "Nomination," and "Nominated" means the amount of Product
    specified by BUYER to be sold and Delivered by SELLER and purchased and
    received by BUYER for a specified Month.

                                       3
<PAGE>
 
21. "Nominated Month of Delivery" means the Month specified by BUYER for which a
    specified amount of Product is to be sold and Delivered by SELLER and
    purchased and received by BUYER.

22. "Original Term" means the first term of this Contract which commences
    January 1, 1998 and concludes December 31, 2004.

23. "Pipeline Blend" means the mixture of SELLER's Pipeline Fill and Product,
    having the quality as represented by the Tank Final Sample, which is to be
    considered Product sold and Delivered by SELLER and purchased and received
    by BUYER with respect to the provisions of this Contract including, but not
    limited to, price and quality.

24. "Pipeline Fill" means the petroleum residing in the pipelines through which
    SELLER makes Delivery of Product to BUYER which may be of a different
    quality than Product.

25. "Pipeline Delivery" or "Pipeline Deliveries" means a Delivery of Product
    from SELLER's Refinery to BUYER's petroleum receiving and storage tanks at
    BPTF via pipeline from SELLER's Refinery interconnecting BUYER's BPTF
    pipeline.

26. "Product" means Low Sulfur Fuel Oil suitable for use as a boiler fuel of the
    quality specifications per Exhibit A.

27. "Refinery" means SELLER's oil refining and related facilities located in the
    Barbers Point area of Oahu, in Campbell Estate Industrial Park, Kapolei,
    Hawaii.

28. "Reverse Line Displacement" means an operation where BUYER pumps BUYER's
    LSFO into the pipeline which SELLER uses to Deliver Product to BUYER in
    order to displace SELLER's Pipeline Fill and thereby prevent an unwanted
    mixture of SELLER's Pipeline Fill and the Product to be Delivered to BUYER.

                                       4
<PAGE>
 
29. "USD" means currency denominated in U.S. dollars.

30. "Year" means a calendar year.

                                   ARTICLE II

                                   AGREEMENT
                                   ---------

     SELLER shall sell and Deliver or cause to be Delivered, and BUYER shall
buy, receive and pay for Product in the quantity described herein.

                                  ARTICLE III

                                     TERM
                                     ----

     The Original Term of this Contract shall be from January 1, 1998 through
December 31, 2004 and shall continue in succession thereafter for Additional
Terms, each for a period of 12-Months, beginning January 1, 2005, unless BUYER
or SELLER gives written notice of termination at least one hundred twenty (120)
Days prior to the expiration of the then current term, including the Original
Term and any Additional Term.

                                  ARTICLE IV


                               PRODUCT & QUALITY
                               -----------------

     SELLER shall sell and Deliver and BUYER shall purchase and receive Product
that shall comply with the specifications as shown in Exhibit A attached hereto
and incorporated herein by reference.

                                       5
<PAGE>
 
                                   ARTICLE V

                                   QUANTITY
                                   --------

SECTION 5.1:  QUANTITY

     During each Year that this Contract is in effect, SELLER shall sell and
Deliver to BUYER, and BUYER shall purchase and receive from SELLER, Product at a
reasonably uniform rate during each Month as set out below:

<TABLE>
<CAPTION>
                          Annual Average Daily Rate in Physical Barrels Per Day
                          -----------------------------------------------------
   
 
      PERIOD                         MINIMUM                MAXIMUM
      ------                         -------                -------
    <S>                              <C>                    <C> 

    1998 -1999                       [---]                  [---]
 
 
                                     MINIMUM                MAXIMUM
                                     -------                -------

 
    2000-2004                        [---]                  [---]
 
 
</TABLE>

The minimum annual volume of Product to be sold and Delivered by SELLER and
Nominated, purchased and received by BUYER under this Contract during each of
Years 1998 and 1999 is [---] barrels; the minimum annual volume of Product to be
sold and Delivered by SELLER and Nominated, purchased and received by BUYER
under this Contract during each of Years 2001, 2002 and 2003 is [---] barrels;
and the minimum annual volume of Product to be sold and Delivered by SELLER and
Nominated, purchased and received by BUYER under this Contract during each of
Years 2000 and 2004 is [---] barrels. The maximum annual volume of Product to be

                                       6
<PAGE>
 
sold and Delivered by SELLER and Nominated, purchased and received by BUYER
under this Contract during each of Years 1998 and 1999 is [---] barrels; the
maximum annual volume of Product to be sold and Delivered by SELLER and
Nominated, purchased and received by BUYER under this Contract during each of
Years 2001, 2002 and 2003 is [---] barrels; and the maximum annual volume of
Product to be sold and Delivered by SELLER and Nominated, purchased and received
by BUYER under this Contract during each of Years 2000 and  2004 is   [---]
barrels.

     The minimum and maximum annual volumes of Product to be sold and Delivered
by SELLER and to be Nominated, purchased and received by BUYER during each Year
of any Additional Term shall be determined by multiplying the Days of that Year
by the annual average daily rate indicated for Year 2004, unless otherwise
mutually agreed.

     Subject to availability, SELLER shall sell and Deliver and BUYER shall
purchase and receive such additional volumes in excess of the maximum annual
volumes as are mutually agreed.

     Except as otherwise expressly provided herein, during each of the
Years 1998 and 1999, the minimum and maximum  volumes sold, Delivered, purchased
and received during each Month shall be determined by multiplying the Days of
that Month by [---] barrels per Day  and [---] barrels per Day, respectively;
and during each of the Years 2000, 2001, 2002, 2003 and 2004, the minimum and
maximum volumes sold, Delivered, purchased and received during

                                       7
<PAGE>
 
each Month shall be determined by multiplying the Days of that Month by [---]
barrels per Day and [---] barrels per Day, respectively.

SECTION 5.2:  REALLOCATION OF DELIVERIES

     If during any fifteen (15) Day period, fewer than 30,000 barrels of LSFO
are delivered by SELLER to Kalaeloa Partners, L.P. ("Kalaeloa") due to an
unanticipated equipment outage at the oil-fired combined cycle facility owned by
Kalaeloa at Campbell Industrial Park, SELLER and BUYER shall agree to reallocate
to BUYER said un-delivered LSFO, the quality of which shall be in conformance
with the specifications of Article IV, to the extent required by BUYER and not
required by Kalaeloa. The price for such reallocated Product shall be the same
as the price of sales of LSFO to Kalaeloa for the Month in question if the
reallocated Product had been previously washed and treated; otherwise the
reallocated Product shall be priced on the basis of sales of Product to BUYER as
determined in Section 6.1 During any period when Product is being reallocated by
SELLER to BUYER, the volume of such reallocated Product shall not be included in
the determination of the volume of Product purchased and received by BUYER with
respect to the minimum and maximum annual and Monthly volumes specified in
Section 5.1.

                                  ARTICLE VI

                                     PRICE
                                    ------

SECTION 6.1:   DETERMINATION OF PRODUCT PRICE

     The price in USD per barrel of Product Delivered to meet the Nominated
commitment of a Month shall be determined Monthly according to the following
price formula:

                                       8
<PAGE>
 
              [---] = [---]

              Where:

              P   =  Product price in USD per barrel for the Nominated Month of
                     Delivery.

              S1  =  Base price expressed in USD per barrel which shall consist
                     of the simple average of the daily high and low or bid and
                     asked market prices for Singapore or Singapore/Indonesia
                     cracked, mixed/cracked or equivalent quality LSWR, as
                     assessed on all dates of publication of [---] during the
                     period beginning the 21st of the second Month immediately
                     preceding the Nominated Month of Delivery and ending the
                     20th of the Month immediately preceding the Nominated Month
                     of Delivery.

              [---]  =  [---]

              S2  = The simple average of the high and low prices for Los
                     Angeles Bunker C fuel as reported by the Platt's Oilgram
                     Bunkerwire ("Platt's Bunkerwire") for all dates of
                     publication during the period beginning the 21st Day of the
                     second Month immediately preceding the Nominated Month of
                     Delivery and ending the 20th Day of the Month immediately
                     preceding the Nominated Month of Delivery, expressed in USD
                     per barrel using a conversion factor of 6.368 barrels per
                     metric ton.

              F1  =  A factor for quality differential of Product Delivered such
                     as sulfur content, where F1 = 0.10 * (S2 - (S1+R1)).

              F2 =   The BTU Content of each Product Delivery pursuant to
                     Article VII and Exhibit A, expressed in million BTUs per
                     barrel with three significant figures to the right of the
                     decimal point.

              F3 =   A factor for tanker freight defined as follows:

                             F3 = F5 + FRD1 + FRD2

                                       9
<PAGE>
 
              Where F3 is a market index for freight, defined for each calendar
              quarter as the sum of:

              F5  =  The simple average of the Average Freight Rate Assessment
                     ("AFRA") Worldscale Points for the average of Large Range 1
                     vessels, as published Monthly by London Tanker Brokers
                     Panel Limited for the three Monthly publications in the
                     calendar quarter immediately preceding the calendar quarter
                     of the Nominated Month of Delivery, multiplied by the
                     Worldscale 100 rate for voyages between Singapore and
                     Barbers Point, Hawaii, applicable to the Year of the
                     quarter of the referenced AFRA data, expressed in New
                     Worldscale rates, as published by Worldscale Associates
                     (London Limited) in its New Worldscale Nominal Freight
                     Scale (Worldscale). Monthly AFRA publications show rates of
                     vessel voyages which occurred during the period beginning
                     the 16th Day of the second Month immediately preceding that
                     publication and ending the 15th Day of the Month
                     immediately preceding the publication. Exhibit B includes
                     an illustrative computation; plus,

              FRD1 = A fixed rate differential for segregated ballast tank
                     configured tankers ("SBT Tankers"), if and as provided by
                     Worldscale, with respect to the Additional Insurance
                     Premium for Basic ($500 Million) coverage of Oil Pollution
                     Liability Insurance on vessels carrying persistent oils to
                     and from the U.S.A., consistent with a typical vessel
                     derived in Exhibit C attached to this Contract; plus,

              FRD2 = A fixed rate differential for SBT Tankers, if and as
                     provided by Worldscale, with respect to the Additional
                     Insurance Premium for Excess ($200 Million) coverage of Oil
                     Pollution Liability Insurance on vessels carrying
                     persistent oils to and from the U.S.A., consistent with a
                     typical vessel derived in Exhibit C attached to this
                     Contract.

              This market index for freight will be expressed in USD per barrel,
              using a conversion factor of 6.75 barrels per metric ton.

         [---] =  [---]
 
              1998-1999
              ---------

                  [---]  [---] per barrel

                                       10
<PAGE>
 
              2000-2004
              ---------
   
                  [---]  [---] per barrel
 
         T  = The Hawaii General Excise Tax, the Hawaii Environmental Response
              Tax and any other tax properly imposed on the sale of Product
              pursuant to Section 6.2 herein.

The per barrel premium, Product price formula component F4, applicable to
Product sold and Delivered by SELLER to meet the Nominated commitment of a Month
in 2004 shall also apply to Product sold and Delivered by SELLER and purchased
and received by BUYER during each Year of any Additional Term, unless otherwise
mutually agreed.

     The price for Product Delivered shall be based on the price for the Month
of Delivery originally Nominated by the BUYER, regardless of the Month in which
the quantity of Product Nominated is actually Delivered.

     All prices, price components, price component elements, including their
averages and factors, adjustments thereto and other sums payable hereunder in
this Contract shall be stated in the nearest thousandth of a dollar unless
specifically stated otherwise.

     Exhibit B, attached hereto and included herein by reference, contains an
illustrative schedule of prices calculated pursuant to this Section 6.1.

     [---] and Platt's Bunkerwire shall include any successor publication(s)
and, in the event of discontinuance of any of these publications or the price
assessments of Singapore or Singapore/Indonesia cracked, mixed/cracked or
equivalent quality LSWR, or the [---] or the assessment of Los Angeles Bunker C
fuel, or the publications referred to in the definition of price formula
components for freight F3, F5, FRD1, FRD2 or Exhibit C, the parties shall
mutually agree upon the use of alternate reporting services or publications or
similar price

                                       11
<PAGE>
 
assessments and any resulting modification of the per barrel premium, i.e.
Product price formula component F4, as may be reasonable under the
circumstances.

SECTION 6.2:  TAXES, ASSESSMENTS, LEVIES AND IMPOSTS

     In addition to all other amounts payable by BUYER under this Contract,
BUYER shall reimburse SELLER for all taxes, assessments, levies, and imposts of
whatsoever kind or nature imposed on SELLER by any governmental or quasi-
governmental body, as adjusted, modified or revised from time to time, including
without limitation the Hawaii General Excise Tax and the Hawaii Environmental
Response Tax, with respect to the execution or performance of this Contract or
the receipt by SELLER of payments hereunder. Notwithstanding the foregoing and
any illustrative price calculation, such as contained in Exhibit B, BUYER shall
not be required to reimburse SELLER for any tax measured by or based on the net
income of SELLER or for real property taxes or to duplicate any item of expense
of SELLER which is recovered by SELLER under the Product prices provided for in
Article VI. BUYER shall not be required to reimburse SELLER under this Article
VI for any item expressly mentioned by [---] and [---], or confirmed by [---] or
[---] in writing upon inquiry by either BUYER or SELLER, as being included in a
price assessment incorporated in Article VI. There shall be no modification in
the calculation of any unit of measure conversion, sulfur adjustment, BTU
Content adjustment, or similar computation of other quality components solely
due to the presence or absence of any tax, assessment, levy, impost or other
such similar item of expense contained in any such component. At the execution
of this Contract, the taxes, assessments, levies or imposts which are currently
in effect include the Hawaii General Excise Tax (4.166%) and the Hawaii
Environmental Response

                                       12
<PAGE>
 
Tax ($0.05 per barrel).  The Hawaii Environmental Response Tax is not subject to
Hawaii General Excise Tax.

                                  ARTICLE VII

                                   DELIVERY
                                   --------

SECTION 7.1:  NOTIFICATION AND PRODUCT DELIVERY

     Subject to the minimum and maximum amounts specified in Section 5.1, BUYER
will provide SELLER written notice of the Nominated rate of Delivery for each
Month [---] Days prior to the first Day of said Month.

     No later than ten (10) Days prior to the beginning of each Month, SELLER
shall provide BUYER a proposed schedule of Pipeline Deliveries and Marine
Deliveries ("Delivery Schedule") to be made by SELLER for the following two
Months. The proposed Delivery Schedule shall specify the type of Delivery,
Pipeline Delivery or Marine Delivery, approximate quantity, the approximate date
and a characterization of the approximate viscosity, either low, 100 - 200 SSU
at 210 DF, medium, 201 - 350 SSU at 210 DF, or high, 350 - 450 SSU at 210 DF,
for each individual Delivery. BUYER shall notify SELLER of its acceptance or
rejection of the proposed Delivery Schedule within three (3) business days of
its receipt, such notice to include the cause or reasons for BUYER's rejection.
BUYER may reject the proposed Delivery Schedule because the proposed date or
volume of an individual Delivery is inconsistent with the limits on Product
Delivery ratability specified in this Article VII. If BUYER rejects the proposed
Delivery Schedule because the necessary space in BUYER's storage tanks at
BUYER's BPTF is unavailable or as a result of some other similar operational
consideration, BUYER shall make 

                                       13
<PAGE>
 
reasonable efforts to rearrange other schedules to provide SELLER a satisfactory
alternate Delivery date or alternate Delivery volume. In this and all such
similar efforts, SELLER and BUYER shall make reasonable efforts to coordinate
their individual Pipeline Deliveries and Marine Deliveries into and out of
BUYER's BPTF to minimize operational difficulties and costs.

     SELLER shall notify BUYER of a change in the proposed Delivery Schedule due
to any of the following causes with respect to any Delivery when it shall become
known to SELLER:

     a)     A change in the previously advised volume of a Pipeline Delivery, if
such change is in excess of 10,000 barrels or a change in the previously advised
volume of a Marine Delivery, if such change is in excess of 20,000 barrels.

     b)     A change in the date of a Delivery, if such change is more than 2
Days earlier or later than the previously advised date; or

     c)     A change in the previously advised viscosity characterization of a
Delivery.

SECTION 7.2:  DELIVERY RATABILITY

     BUYER shall not be required to take Delivery, and SELLER shall not be
required to make Delivery of more than [---] percent of a Monthly Nomination in
any [---] consecutive Day period. The minimum and maximum amounts specified in
Section 5.1 to be Delivered in any given Month may be further modified upon
mutual agreement of the parties.

     Unless waived by BUYER, SELLER's Deliveries of Product, inclusive of any
and all components, shall be limited to [---] barrels for any individual
Pipeline Delivery, and limited to [---] barrels for any individual Marine
Delivery. BUYER shall be under no obligation to receive a Pipeline Delivery from
SELLER if SELLER's Delivery status on a Month-To-Date Ratable basis would be in
excess of plus [---] barrels upon completion of the Pipeline

                                       14
<PAGE>
 
Delivery in question.  Similarly, BUYER shall be under no obligation to receive
a Marine Delivery from SELLER if SELLER's Delivery status on a Month-To-Date
Ratable basis would be in excess of [---] barrels upon completion of the Marine
Delivery in question.

SECTION 7.3:  PURCHASE DEFICIT

     If for reasons other than Force Majeure, BUYER's anticipated demand for
Product on an annual basis during any Year during the term of this Contract
should reasonably indicate that its Monthly Delivery requirements for the
balance of the Year will result in its annual purchases of Product from SELLER
declining below the BUYER's minimum annual quantity set forth in Section 5.1
(the difference between BUYER's anticipated demand and BUYER's minimum annual
quantity being a "Purchase Deficit Position"), then BUYER shall give prompt
written notice to SELLER.

     So long as the BUYER is in a Purchase Deficit Position, BUYER shall
purchase and receive from SELLER, [---] The Purchase Deficit Position shall
terminate when total cumulative purchases under this Contract exceed the minimum
annual quantities prorated on a Monthly basis. This Section 7.3 is without
prejudice to any other remedies SELLER may have under this Contract with respect
to BUYER's failure to comply with Section 5.1.

                                       15
<PAGE>
 
SECTION 7.4:  FAILURE TO SUPPLY

          Except in the event of Force Majeure or an agreement by the parties to
the contrary,  if SELLER's anticipated Pipeline Deliveries and Marine Deliveries
of Product shall  reasonably indicate that the cumulative quantity of its
Deliveries to BUYER shall result in a Delivery status on a Month-To-Date Ratable
basis  in excess of [---] barrels. SELLER shall be deemed  to be in a "Failure
to Supply Position" and shall give prompt written notice of same to BUYER.

          In the event that the SELLER is in a Failure to Supply Position, both
BUYER and SELLER shall attempt to minimize the impact of any Failure to Supply
Position such that it not impose an unreasonable risk to BUYER.  If [---]
SELLER's Delivery Status is [---] on a [---] BUYER may, [---] The BUYER will [--
- -] and the SELLER shall [---]  If the BUYER [---] under this Section 7.4, the [-
- --] for the Year in question, shall be [---] This Section 7.4 is without
prejudice to any other remedies BUYER may have under this Contract with respect
to SELLER's failure to comply with Section 5.1.

SECTION 7.5:  PIPELINE DELIVERY

     Pipeline Deliveries shall be made by SELLER from SELLER's Hawaii Refinery
through SELLER's pipelines to BUYER at BUYER's BPTF.  Title to Product and the
risk of loss of Product Delivered by Pipeline Delivery shall pass from SELLER to
BUYER as per Section 7.7.

                                       16
<PAGE>
 
     All samples, measurements and determinations drawn, taken and made,
respectively, under this Section 7.5 shall be under the supervision of the
Independent Inspector.  SELLER and BUYER shall share equally the cost of
independent inspections.

     The quality and BTU Content of the Product Delivered by Pipeline
Delivery shall be determined on the basis of a volumetric weighted average
composite of samples drawn by the Independent Inspector from SELLER's issuing
tank(s) in such a manner as to be representative of each individual Pipeline
Delivery ("Tank Final Sample").

     The Tank Final Sample shall be divided into a minimum of three (3) parts as
follows:

     1.  One part shall be provided to SELLER's laboratory for analysis to
         determine quality including BTU Content per barrel.

     2.  One part shall be provided to BUYER for the purpose of verifying
         SELLER's determinations.

     3.  At least one part shall be sealed and provided to the Independent
         Inspector to be retained for a period of at least three (3) Months.

     SELLER agrees to provide BUYER and the Independent Inspector with a copy of
SELLERis preliminary laboratory analyses of the Tank Final Sample ("Pre-shipment
Report") and shall provide this Pre-shipment Report prior to shipment of the
Product.

     SELLER agrees to provide BUYER and the Independent Inspector with the
Certificate of Quality representing the Tank Final Sample and will make a
reasonable good faith effort to provide this Certificate of Quality no later
than twenty four (24) hours after the completion of the Pipeline Delivery. If
the completed Certificate of Quality is not available within said 24-hour
period, SELLER will advise BUYER and the Independent Inspector, within said 24-
hour period,

                                       17
<PAGE>
 
the final determination of API gravity, flash point, sulfur content
and sediment & water representing the Tank Final Sample.

     BUYER shall have the right to perform laboratory analyses in order to
verify the results of SELLER's laboratory analyses; provided however, that such
verification analyses shall be performed in a timely manner. SELLER and BUYER
will make reasonable good faith efforts to evaluate BTU Content and exchange
results within three (3) working days of the completion of the Pipeline
Delivery.

     In order to eliminate or minimize the volume of SELLER's Pipeline Fill
received by BUYER in the course of a Pipeline Delivery operation, BUYER shall
have the option to perform a Reverse Line Displacement whereby SELLER's Pipeline
Fill is displaced to SELLER using BUYER's LSFO at the commencement of Pipeline
Delivery operations.

     If BUYER elects not to commence Pipeline Delivery operations by displacing
SELLER's Pipeline Fill with BUYER's LSFO, or if such displacement is
operationally unfeasible or impractical for any other cause, SELLER and BUYER
recognize that the Product received by BUYER in a Pipeline Delivery may be a
Pipeline Blend which includes some amount of SELLER's Pipeline Fill. In such
instance, the specification of SELLER's Pipeline Fill shall be determined by
SELLER on the basis of SELLER's samples representative of the contents of the
storage tank from which SELLER's Pipeline Fill was issued. SELLER agrees to
provide BUYER, BUYER's representative and the Independent Inspector with a copy
of its laboratory analysis of the quality of SELLER's Pipeline Fill prior to
commencing the Pipeline Delivery.

     To provide an early warning of any quality problems with the Product
Delivered via a Pipeline Blend, SELLER agrees to perform a pre-shipment computer
blend simulation

                                       18
<PAGE>
 
representing the quality of SELLER's LSFO from the issuing tank(s) as
indicated in the relevant Certificates of Quality or preliminary laboratory
analyses of the Tank Final Samples and the quality of SELLER's Pipeline Fill as
indicated in the relevant laboratory analyses.   The computer blend simulation
shall provide preliminary confirmation of the Pipeline Blend's conformance with
the limits for API gravity, viscosity and percent by weight sulfur content
specified in Article IV.  SELLER agrees to provide BUYER or BUYER's
representative and the Independent Inspector a copy of the computer blend
simulation results prior to shipment.  SELLER agrees that under no circumstances
shall it make a Pipeline Delivery of Product to BUYER should the computer blend
simulation or any other information available to SELLER indicate a quality
problem with the Product or Pipeline Blend, without BUYER's express written
permission.

     The quantity of Product in a Pipeline Delivery shall be determined at the
time of each Pipeline Delivery by gauging SELLER's issuing tank(s) immediately
before and after pumping under the supervision of the Independent Inspector.
Should BUYER elect to perform a Reverse Line Displacement, the total quantity of
Product Delivered to BUYER shall be reduced by reference to the rise in SELLER's
tank(s) receiving SELLER's Pipeline Fill, determined by gauging such tank(s)
immediately before and after pipeline displacement under the supervision of the
Independent Inspector. Both BUYER and SELLER agree that if measurement of
SELLER's tank(s) is, in the opinion of the Independent Inspector, considered to
have been rendered inaccurate for reasons including, but not limited to,
operational constraints or inadvertent transfer of Product or of SELLER's
Pipeline Fill within SELLER's facilities, then

                                       19
<PAGE>
 
the quantity of Product or SELLER's Pipeline Fill may be determined by gauging
BUYER's receiving tank(s) before and after pumping under the supervision of the
Independent Inspector.

     Quantities of Product sold and Delivered by SELLER and purchased and
received by BUYER hereunder shall be calculated in accordance with the current
measurement standards adopted by industry, ASTM, API and other recognized
standard-setting bodies as are applicable in the opinion of the Independent
Inspector and shall be expressed in G.S.V., U.S. barrels @  60 degrees F.

SECTION 7.6:  MARINE DELIVERY

     Marine Deliveries shall be made by SELLER from SELLER's vessel and may
include LSFO, blending stocks or other components of Product originating at
SELLERis Hawaii Refinery, through SELLERis pipelines to BUYER at BUYER's BPTF.
Title to Product and the risk of loss of Product Delivered by Marine Delivery
shall pass from SELLER to BUYER as per Section 7.7.

     SELLER agrees to provide BUYER or the Independent Inspector, prior to
commencing a Marine Delivery of Product or any component thereof from SELLER's
vessel, a copy of SELLER's port of loading quality document showing the quality
of the Product or component thereof.

     All samples, measurements and determinations referenced in this Section 7.6
shall be drawn, taken and made, respectively, under the supervision of the
Independent Inspector. SELLER and BUYER shall share equally the cost of
independent inspections.

     In order to reduce the likelihood of SELLER's Marine Delivery resulting in
quality problems arising in the receiving tank(s) at BUYER's BPTF, SELLER agrees
to test a

                                       20
<PAGE>
 
volumetric weighted average composite of samples of the relevant marine cargo of
Product, or component thereof ("Precautionary Sample").  The Precautionary
Sample shall be drawn under the supervision of the Independent Inspector from
SELLER's vessel's tanks in such a manner as to be representative of the
relevant cargo after the arrival of the vessel at Barbers Point, but prior to
commencement of the Marine Delivery.  SELLER agrees that should its laboratory
testing of the Precautionary Sample indicate a potential quality problem,
including but not limited to, a quality as determined which materially differs
from that specified on the port of loading quality document or does not conform
to the quality specification limits in Article IV, the vessel operator shall not
be instructed to commence Delivery of its cargo to BUYER's BPTF until such time
as the loaded Product or component thereof is determined to meet the port of
loading quality specifications or is otherwise in conformity with the
specification limits in Article IV.
     The quality and BTU Content of the Product Delivered by Marine Delivery
shall be determined on the basis of a volumetric weighted average composite of
samples drawn by the Independent Inspector from the receiving tank(s) at BUYER's
BPTF in such a manner as to be representative of the entire Marine Delivery
("Receiving Tank Final Sample").
     The Receiving Tank Final Sample shall be divided into a minimum of three
(3) parts as follows:

     1.  One part shall be provided to SELLER's laboratory for analysis to
         determine quality and BTU Content per barrel.
     2.  One part shall be provided to BUYER for the purpose of verifying
         SELLER's determinations.

                                       21
<PAGE>
 
     3.  At least one part shall be sealed and provided to the Independent
         Inspector to be retained for a period of not less than three (3)
         Months.

     SELLER agrees to provide BUYER and the Independent Inspector with the
Certificate of Quality representing the Receiving Tank Final Sample and will
make reasonable good faith efforts to provide this Certificate of Quality no
later than twenty four (24) hours after SELLER's laboratory determines the
Product Delivered by Marine Delivery is in conformance with the specification
limits in Article IV.  If the completed Certificate of Quality is not available
within said 24-hour period, SELLER will advise BUYER and the Independent
Inspector, within said 24-hour period, the final determination of API gravity,
flash point, sulfur content and sediment & water representing the Receiving Tank
Final Sample.
     BUYER shall have the right to perform laboratory analyses in order to
verify the results of SELLER's laboratory analyses; provided however, that such
verification analyses shall be performed in a timely manner. SELLER and BUYER
will make reasonable good faith efforts to evaluate BTU Content and exchange
results within three (3) working days of SELLER's laboratory determining the
Product Delivered by Marine Delivery is in conformance with the specification
limits in Article IV.
     Quantities of the Product Delivered via a Marine Delivery hereunder shall
be determined at the time of each Marine Delivery by gauging BUYER's tank(s)
immediately before and after pumping under the supervision of the Independent
Inspector. Should BUYER elect to perform a Reverse Line Displacement, the total
quantity of Product Delivered to BUYER shall be reduced by reference to the rise
in the SELLER's tank(s) receiving SELLER's Pipeline Fill, determined

                                       22
<PAGE>
 
by gauging such tank(s) immediately before and after pipeline displacement under
the supervision of the Independent Inspector.
     Quantities of Product sold and Delivered by SELLER and purchased and
received by BUYER hereunder shall be calculated in accordance with the current
measurement standards adopted by industry, ASTM, API and other recognized
standard-setting bodies as are applicable in the opinion of the Independent
Inspector and shall be expressed in G.S.V., U.S. barrels @ 60 degrees F.
     The maximum quantity of any Marine Delivery to be invoiced by SELLER to
BUYER in any ten (10) Day period, shall not exceed an amount equivalent to [---]

SECTION 7.7:  TITLE AND RISK OF LOSS

     Title to Product and the risk of loss of Product Delivered by Pipeline
Delivery shall pass from SELLER to BUYER at the connection between the flange of
SELLER's pipeline and BUYER's pipeline at BUYER's BPTF.
     Title to Product Delivered by Marine Delivery shall pass from SELLER to
BUYER in the tank(s) at the BPTF as soon as the quality of the Product so
Delivered is determined by SELLER to meet the specification limits in Article
IV, subject to BUYER's timely verification, or at BUYER's option, BUYER's verbal
notice to SELLER allowing release for shipment prior to verification.

                                       23
<PAGE>
 
     The [---] shall pass from [---] at the [---] provided, however, that in the
event [---] SELLER shall [---]

SECTION 7.8:  DISPUTE

     The official BTU Content determination shall be as reported in SELLER's
Certificate of Quality, provided that the arithmetic difference between SELLER's
and BUYER's laboratory results is equal to or less than the then existing ASTM
reproducibility standard (currently 0.4 MJ/kg, which the parties shall deem to
be equivalent to a fixed standard of 60,000 BTU per barrel) for test D-240. If
the difference between SELLER's and BUYER's determinations of BTU Content should
fall outside the ASTM reproducibility standard for ASTM test D-240, the sealed
sample in the possession of the Independent Inspector shall be provided to an
independent laboratory for an official determination, which shall be binding
upon the parties. SELLER and BUYER shall share equally the costs of independent
tests and determinations.
     If SELLER or BUYER has reason to believe that the quality or quantity of
Product stated for a specific Delivery per Section 7.5 or Section 7.6 is
incorrect, that party shall within thirty (30) Days after the later of the date
of the complete Certificate of Quality or the date of the final determination of
BTU Content, present the other party with documents supporting such
determination and the parties will confer, in good faith, on the causes for the
discrepancy and shall proceed to correct such causes and adjust the quality and
quantity, if justified, for the

                                       24
<PAGE>
 
Pipeline Delivery or Marine Delivery in question. In the event of an
unresolvable difference between SELLER and BUYER, the sealed part of the
representative sample in the possession of the Independent Inspector shall be
provided to an independent laboratory for an official determination, which shall
be final. SELLER and BUYER shall share equally the cost for such independent
laboratory determination.
     If the quality of the Product received by BUYER fails to conform to the
quality specification limits in Article IV of this Contract, both BUYER and
SELLER shall attempt to minimize the impact of any quality problem on BUYER by
specification waiver, if the use of the Product will not unreasonably cause harm
to BUYER, or by SELLER Delivering higher quality Product in a timely manner to
produce a specification quality blend in BUYER's storage tank(s) at BUYER's BPTF
or at BUYER's Oahu generating plants. If all such, and similar, efforts fail to
resolve the quality problem, then BUYER may return non-specification Product to
SELLER, in which case SELLER shall replace the non-specification Product to
BUYER in a timely manner. All costs and expenses, including BUYER's handling
costs incurred in returning and replacing non-specification Product, shall be
borne by SELLER.

                                 ARTICLE VIII

                                    PAYMENT
                                    -------

SECTION 8.1:  INVOICES

     Invoices shall be prepared by SELLER and dated after a Delivery has been
completed. [---]Invoices shall be accompanied by full documentation, reasonably
acceptable to the BUYER, such as, but not limited to, Certificate of

                                       25
<PAGE>
 
Quality, report of the Independent Inspector and price calculation. SELLER will
transmit an original of the invoice to BUYER on the [---] Day by mail to the
following address or as otherwise instructed.

BUYER:                 HAWAIIAN ELECTRIC COMPANY, INC.
                       ATTN:  DIRECTOR FUEL RESOURCES, MAIL STOP WP-2/IF
                       P. O. BOX 2750
                       HONOLULU, HAWAII  96840
                       FACSIMILE:  (808) 543-4207

     Invoices, invoice documentation, laboratory analyses and other documents
having to do with the quality, quantity and Delivery of Product or otherwise
with the Product sold and purchased hereunder may be sent by first class mail,
postage prepaid, by electronic transmission (facsimile or electronic mail) or by
personal delivery. The parties may substitute other addresses upon the giving of
proper notice from time to time. Correspondence and documents of a similar
nature may be sent to SELLER to the following address or as otherwise
instructed.

SELLER:                BHP PETROLEUM AMERICAS REFINING INC.
                       ATTN: MANAGER HAWAII SUPPLY AND LOGISTICS
                       P. O. BOX 3379
                       HONOLULU, HAWAII   96842
                       FACSIMILE:  (808) 547-3048


SECTION 8.2:  METHOD OF PAYMENT

     Payment shall be made without discount in USD [---] from the receipt of
invoice by wire transfer of immediately available funds to:

                              Citibank, New York
                                ABA # 021000089
                     BHP Petroleum Americas Refining Inc.
                               Account #40643342

Due dates are dates payments are to be received by SELLER.

                                       26
<PAGE>
 
SECTION 8.3:  PAYMENTS

     If SELLER's final laboratory result for BTU Content is unavailable or if
said laboratory result is disputed by BUYER pursuant to Section 7.8, SELLER may
issue a provisional invoice calculated on the basis of the heat-content standard
of 6.2 million BTU per barrel. BUYER shall make payment for such provisional
invoice in accordance with Section 8.2.
     If an invoice incorporating an item, other than a heat rate adjustment
which is disputed, has been sent to BUYER, then BUYER shall make payment in
accordance with Section 8.2 for such invoice items or that portion of the
invoiced Delivery which is not disputed by BUYER and in which case BUYER shall
make such adjustment to taxes and other value-dependent items as are reasonable
under the circumstances.
     The provisional invoice or invoice incorporating items in dispute shall be
adjusted in accordance with the terms of Article VI by subsequent invoicing or
by issuing a credit or debit with respect to the original invoice [---] of
receipt of the independent laboratory determination pursuant to Section 7.8 or
other resolution of the issue in dispute. BUYER shall make payment for such
subsequent invoices or debits in accordance with Section 8.2. BUYER shall have
the option to apply such credit against payments to be made subsequent to the
receipt of the credit, or if such payments are not expected to be made [---]
BUYER shall be able to receive said credit in immediately available funds within
three (3) business days of SELLER's receipt of BUYER's written instructions.

SECTION 8.4:  INTEREST

     At SELLER's option and election, interest will accrue on all amounts, other
than invoice items in dispute, not paid in accordance with the provisions of
Sections 8.2 and 8.3 at the then

                                       27
<PAGE>
 
existing [---]

                                  ARTICLE IX

                                    NOTICES
                                    -------

     Except as otherwise expressly provided herein, all notices shall be given
in writing, by letter, facsimile or electronic mail to the following addresses
or such other address as the parties may designate by notice, and shall be
deemed to have been duly given when sent or personally delivered to the other
party at the address noted below:

BUYER:                 HAWAIIAN ELECTRIC COMPANY, INC.
                       P. O. BOX 2750
                       HONOLULU, HAWAII  96840
                       ATTN:  VICE PRESIDENT, POWER SUPPLY
                       FACSIMILE:  (808) 543-7707

SELLER:                 BHP PETROLEUM AMERICAS REFINING INC.
                        P. O. BOX 3379
                        HONOLULU, HAWAII   96842
                        ATTN:  VICE PRESIDENT, INTERNATIONAL SUPPLY AND 
                               MARKETING
                        FACSIMILE:  (808) 547-3796



                                   ARTICLE X

                                     [---]

     It is understood and agreed that both parties entered into this
Contract [---] of this Contract or any subsequent amendments hereto, [---]

                                       28
<PAGE>
 
[---] is [---] by [---] or [---] by [---] hereunder. [---] Such [---] shall be
[---] after such a [---] the parties shall [---] negotiations and in the event
that the parties do not agree upon a new Product Price or other [---] within [--
- -] Days after [---] the [---] Such [---] within [---] has been agreed upon, or
[---]

                                       29
<PAGE>
 
                                  ARTICLE XI

                                 FORCE MAJEURE
                                 -------------

SECTION 11.1:  FORCE MAJEURE

     As used in this contract, an event or act of Force Majeure is defined as
follows: acts of God, wars, riots, strikes, labor disputes, lockouts, blockades,
insurrections, inability to secure materials or labor by reason of allocations
promulgated by governmental agencies, unavailability of shipping of crude oil
supplies, epidemics, landslides, lightning, earthquakes, fires, floods, tidal
waves, volcanic eruptions, explosions, failure of machinery or pipelines, or any
other causes not within the reasonable control of the affected party .

SECTION 11.2:  OBLIGATIONS SUSPENDED

     BUYER's obligation to purchase or receive Product, or SELLER's obligation
to sell or Deliver Product, shall be suspended to the extent performance is
prevented by an event or act of Force Majeure for any period in which such event
or act exists as to the party claiming Force Majeure; and so long as such party
is exercising its good faith efforts to overcome such Force Majeure event.
However, nothing in this Article excuses BUYER from its obligation to make
payments of money due SELLER for Product already Delivered to BUYER.

SECTION 11.3:  NOTICE OF FORCE MAJEURE

     The party claiming Force Majeure agrees to give the other party prompt
written notice of an act or event of Force Majeure. The party claiming Force
Majeure shall use due diligence to cure any act or event of Force Majeure, and
shall give the other party prompt notice after the act

                                       30
<PAGE>
 
or event of Force Majeure has terminated.  This Article XI shall not require any
party to settle or compromise any strike or labor dispute.

SECTION 11.4:  NO MAKE-UP REQUIREMENT

     After the act or event of Force Majeure has terminated, SELLER shall not be
obligated to sell and Deliver and BUYER shall not be obligated to purchase and
receive the undelivered quantity of Product that normally would have been sold
and Delivered during the period of Force Majeure.

                                  ARTICLE XII

                         PRICE AND ALLOCATION CONTROLS
                         -----------------------------

SECTION 12.1:  REGULATORY PRICE SUSPENSION

     If SELLER is precluded by statute, or by regulation, rule, governmental
interpretation or order implementing such statute from obtaining any increase in
Product Price, as determined pursuant to this Contract, the increase shall be
suspended until said law, regulation, rule, governmental interpretation or order
permits the increase in whole or in part. In such an event, BUYER and SELLER
shall confer in good faith and attempt to agree on an alternate course of
action; but failing agreement within ten (10) Days, the party adversely affected
may suspend performance with respect to the quantity of Product affected by the
statute, regulation, rule, governmental interpretation or order. In the event
the law, regulation, rule, governmental interpretation or order is terminated or
is later modified to permit the increase, in whole or in part, the Product Price
shall be increased for Deliveries of the Product made thereafter to the level
permitted under this Contract without further action by the parties.

                                       31
<PAGE>
 
SECTION 12.2:  GOVERNMENT REGULATIONS

     If the Delivery or supply of Product pursuant to this Contract conflicts
with or is limited or prohibited by any federal, state or local regulations,
statutes, rules or permits then to the extent of such conflict, limitation or
prohibition, SELLER shall have no obligation to Deliver or supply BUYER with the
Product under this Contract and BUYER shall have no obligation to purchase or
receive the Product under this Contract. BUYER, in BUYER's discretion, may elect
to complete and file any and all required Federal or state regulatory forms to
permit, facilitate, or enable the supply of Product to BUYER under this
Contract. SELLER shall fully cooperate with BUYER in the completion and filing
of the foregoing forms. If BUYER's purchase, receipt or use of Product pursuant
to this Contract conflicts with or is limited or prohibited by any Federal,
State, or local regulations, statutes, rules or permits then to the extent of
such conflict, limitation, or prohibition, BUYER shall have no obligation to
purchase and receive the Product under this Contract.

                                 ARTICLE XIII

                                  ASSIGNMENT
                                  ----------

     This Contract shall not be assigned by either party without prior written
consent of the other party, which shall not be unreasonably withheld; provided,
however, BUYER may assign this Contract to the Trustee under BUYER's First
Mortgage Indenture dated December 1, 1938.

                                       32
<PAGE>
 
                                  ARTICLE XIV

                                APPLICABLE LAW
                                --------------

     This Contract shall be deemed to be a Contract made under and shall be
governed by and construed in accordance with the laws of the State of Hawaii.
The parties hereby consent to the personal jurisdiction of the federal and state
courts in the State of Hawaii.

                                  ARTICLE XV

                          PUBLIC UTILITIES COMMISSION
                          ---------------------------

     This Contract is required to be filed with the Hawaii Public Utilities
Commission ("PUC") for approval. If in the proceedings initiated as a result of
the filing of this Contract, the PUC disapproves or fails to authorize the full
recovery of the fuel cost incurred under this Contract through the BUYER's
Energy Cost Adjustment Clause, BUYER may terminate this Contract at any time 
[---] by giving sixty (60) Days written notice to the SELLER.

                                  ARTICLE XVI

                    ENTIRE AGREEMENT, WAIVER AND ILLEGALITY
                    ---------------------------------------

     This Contract incorporates the entire agreement between the parties with
reference to the subject matter and cancels and supersedes as of the date of
execution hereof all prior oral or written understandings, or agreements,
between the parties with respect to the subject matter and may only be modified
by written instrument executed by duly authorized representatives of the
parties. There are no other agreements which constitute any part of the
consideration for, or any

                                       33
<PAGE>
 
condition to, either party's compliance with its obligations under this
Contract. Failure to insist upon strict performance of any provision shall not
constitute a waiver of the right to require such performance, nor shall a waiver
in one case constitute a waiver with respect to a subsequent or continuing
breach, whether of a similar nature or otherwise. If any term or provision of
this Contract is held by any Court to be illegal or unenforceable, the remaining
terms, provisions, rights and obligations shall not be affected. The headings or
captions are for convenience only and have no force or effect on legal meaning
in the construction or enforcement of the Contract. Time shall be of the essence
in this Contract.

                                 ARTICLE XVII

                                   INDEMNITY
                                   ---------

     SELLER shall indemnify, defend and hold harmless BUYER, its directors,
officers, employees and agents (including but not limited to affiliates and
contractors and their employees) from and against all liabilities, damages,
losses, penalties, claims, demands, suits, costs, expenses, (including
attorneys' fees) and proceedings of any nature whatsoever for bodily injury,
(including death) or property damage, including but not limited to BUYER's
facilities, that results from Product which does not meet specifications or
contaminated Product or that arises out of or is in any manner connected with
the storage or transportation of Product or components thereof, including
SELLER's Pipeline Fill, [---] except to the extent that such injury or damage
may be attributable to the gross negligence or willful action of BUYER.

     BUYER shall indemnify, defend and hold harmless SELLER, its directors,
officers, employees and agents (including but not limited to affiliates and
contractors and their employees)

                                       34
<PAGE>
 
from and against all liabilities, damages, losses, penalties, claims, demands,
suits, costs, expenses, (including attorneys' fees) and proceedings of any
nature whatsoever for bodily injury, (including death) or property damage,
including but not limited to SELLER's facilities, that results from Product
which does not meet specifications or contaminated Product or that arises out of
or is in any manner connected with the storage or transportation of Product or
components thereof, including SELLER's Pipeline Fill, [---] except to the extent
that such injury or damage may be attributable to the gross negligence or
willful action of SELLER.

     Notwithstanding the foregoing, neither party shall be responsible for
consequential damages.

     The provisions of this Article XVII shall survive the termination of the
Contract.

                                 ARTICLE XVIII

                                    DEFAULT
                                    -------

     Failure of either party to promptly perform any material obligation under
this Contract shall constitute an event of default. If BUYER or SELLER considers
the other party (the "Defaulting Party") to be in default of any material
obligation under this Contract, such party (the "Non-Defaulting Party") shall
give the Defaulting Party prompt notice thereof, describing the particulars of
such event of default. The Defaulting Party shall thereafter have thirty (30)
Days from the receipt of said notice in which to remedy such event of default.
If the default is not cured, the Non-Defaulting Party may, without prejudice to
any other rights or remedy of the Non-Defaulting Party, terminate its
obligations under this Contract by written notice to the Defaulting Party,
except for BUYER's obligation to pay in full in United States currency for
amounts due under this Contract and except for any obligation which may accrue
to BUYER or SELLER under Article XVII herein.

                                       35
<PAGE>
 
Any termination shall be without prejudice to accrued rights.  All rights and
remedies hereunder are independent of each other and election of one remedy
shall not exclude another.

                                  ARTICLE XIX

                                 COUNTERPARTS
                                 ------------

     This Contract may be executed in as many counterparts as desired by the
parties, any one of which shall have the force and effect of any original but
all of which together shall constitute the same instrument.

   _________________________________________________________________________

                                       36
<PAGE>
 
     IN WITNESS WHEREOF, the parties hereto, intending to be legally bound
thereby, have caused this Contract to be executed in duplicate originals by
their duly authorized officers.

BUYER

HAWAIIAN ELECTRIC COMPANY, INC.


By /s/ Edward Y. Hirata
   ------------------------------------------------- 

      Edward Y. Hirata
- ----------------------------------------------------
        (Printed or Typed Name)

Its   Vice President, Regulatory Affairs
   -------------------------------------------------


By /s/ Marvin A. Hawthorne
   -------------------------------------------------

      Marvin A. Hawthorne
- ----------------------------------------------------
        (Printed or Typed Name)

Its    Assistant Treasurer
   -------------------------------------------------

 
SELLER

BHP PETROLEUM AMERICAS REFINING INC.


By /s/ Faye W. Kurren
   -------------------------------------------------

     Faye W. Kurren
- ----------------------------------------------------
        (Printed or Typed Name)


Its Vice President, International Supply & Marketing
   -------------------------------------------------

                                       37
<PAGE>
 
                                   EXHIBIT A
                                   ---------

                            PRODUCT SPECIFICATIONS
                            ----------------------

<TABLE> 
<CAPTION> 

LSFO Specification -  Test Item    Measurement Unit     Limits     ASTM Method
- -------------------------------    ----------------     ------     -----------
<S>                                <C>                  <C>        <C> 
GRAVITY @ 60 DEGREES F.              Degrees API       12.0 Min.     D-4052
                                                       24.0 Max.

VISCOSITY                            SSU At 210 DF     100 Min.      D-445,
                                                       450 Max.      D-2161
 
HEAT VALUE, GROSS                    MM BTU/BBL        6.0 million   D-240,
                                                       Min.          D-4868
 
FLASH POINT                          Degrees F.        150 Min.      D-93
 
POUR POINT                           Degrees F.        125 Max.      D-97,
                                                                     D-5949

ASH                                  Percent, Weight   0.05 Max.     D-482
 
SEDIMENT & WATER                     Percent, Weight   0.50 Max.     D-1796
 
SULFUR                               Percent, Weight   0.50 Max.     D-4294
 
NITROGEN                             Percent, Weight   0.50 Max.     D-4629,
                                                                     D-5762
 
VANADIUM                             PPM, Weight       50 Max.       D-5863,
                                                                     AES
</TABLE>

                                       1
<PAGE>
 
                                   EXHIBIT B
                                   ---------

                        ILLUSTRATIVE SCHEDULE OF PRICES
                        -------------------------------

            Illustrative Product Price Calculation for October 1997
 
DETERMINATION OF PRODUCT PRICE UNDER ARTICLE VI.   The Product Price in U.S.
Dollars (USD) per barrel shall be determined Monthly based on the following
price formula:

                                     [---]

S1 =   Simple average of the daily high and low or bid and asked market prices
       for Singapore or Singapore/Indonesia cracked, mixed/cracked or equivalent
       quality LSWR, as assessed on all dates of publication of [---]

I. DETERMINATION OF [---]

       [---] (Price in USD per barrel)

<TABLE> 
<CAPTION> 


      Date         Low        High        Average
      ----         ---        ----        -------
      <S>          <C>        <C>         <C> 

     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]

</TABLE> 

AVERAGE                                 [---]    

                                       1
<PAGE>
 
ii. DETERMINATION OF [---]
 
       [---] (Price in USD per barrel)

<TABLE> 
<CAPTION> 


      Date         Low        High        Average
      ----         ---        ----        -------
      <S>          <C>        <C>         <C> 

     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]

</TABLE> 

AVERAGE                                 [---]    

Average of [---]
      [---] [---]
      [---] [---]

[---] = [---]


[---] = [---]

                                       2
<PAGE>
 
DETERMINATION OF [---]

       [---] (Price in USD per barrel)
 
<TABLE> 
<CAPTION> 


      Date         Low        High        Average
      ----         ---        ----        -------
      <S>          <C>        <C>         <C> 

     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]
     [---]        [---]      [---]         [---]

</TABLE> 

AVERAGE                                 [---]    

[---] =                        [---]
 
F1  =   A factor for quality differential of Product Delivered such as sulfur
        content, where F1 = [---]
 
S2  =   The simple average of the high and low prices for Los Angeles Bunker C
        fuel as reported by the Platt's Bunkerwire

i. DETERMINATION OF MEAN OF PLATT'S BUNKERWIRE LA BUNKER C FUEL OIL
 
        Platt's Bunkerwire LA Bunker C (Price in USD per metric ton)
 
<TABLE> 
<CAPTION> 

       Date         Low         High        Average
       ----         ---         ----        -------
       <S>          <C>         <C>         <C> 

     08/21/97     $95.0000     $99.0000     $97.000 /MT
     08/22/97    $101.0000    $107.0000    $104.000 /MT
</TABLE> 

                                       3
<PAGE>
 
<TABLE> 
 
       <S>          <C>         <C>         <C> 

     08/25/97    $101.0000    $107.0000    $104.000 /MT
     08/26/97    $107.0000    $109.0000    $108.000 /MT
     08/27/97    $108.0000    $112.0000    $110.000 /MT
     08/28/97    $107.0000    $112.0000    $109.500 /MT
     08/29/97    $109.5000    $114.5000    $112.000 /MT
     09/02/97    $110.0000    $113.0000    $111.500 /MT
     09/03/97    $111.0000    $113.0000    $112.000 /MT
     09/04/97    $112.0000    $115.0000    $113.500 /MT
     09/05/97    $113.0000    $116.0000    $114.500 /MT
     09/08/97    $111.0000    $113.0000    $112.000 /MT
     09/09/97    $110.0000    $114.5000    $112.250 /MT
     09/10/97    $110.0000    $115.0000    $112.500 /MT
     09/11/97    $108.0000    $112.0000    $110.000 /MT
     09/12/97    $108.0000    $110.0000    $109.000 /MT
     09/15/97    $109.0000    $111.0000    $110.000 /MT
     09/16/97    $111.0000    $112.0000    $111.500 /MT
     09/17/97    $111.0000    $114.0000    $112.500 /MT
     09/18/97    $108.0000    $114.0000    $111.000 /MT
     09/19/97    $109.0000    $113.0000    $111.000 /MT

</TABLE> 
AVERAGE IN USD PER METRIC TON:   $ 109.893

ii.  CONVERSION OF MEAN OF PLATT'S BUNKERWIRE LA BUNKER C FUEL OIL FROM USD PER
METRIC TON TO USD PER BARREL

Expressed in USD per Bbl:  = $109.893/MT / 6.368 Bbl/MT


S2  =  $17.257 PER BARREL
  
[---]  = [---]

=        [---]

=        [---]

F1       =     [---] PER BARREL
 
F3 =     A factor for tanker freight defined as:

F3 = F5 + FRD1 + FRD2

F5  =  The simple average of the Average Freight Rate Assessment ("AFRA")
       Worldscale Points for the average of Large Range 1 vessels, as published
       Monthly by London Tanker Brokers Panel Limited for the three Monthly
       publications in


                                       4
<PAGE>
 
       the calendar quarter immediately preceding the calendar quarter of the
       Nominated Month of Delivery, multiplied by the Worldscale 100 rate for
       voyages between Singapore and Barbers Point, Hawaii, applicable to the
       Year of the quarter of the referenced AFRA data, expressed in New
       Worldscale rates, as published by Worldscale Associates (London Limited)
       in its New Worldscale Nominal Freight Scale (Worldscale).


i.  AFRA WORLDSCALE LARGE RANGE 1 AVERAGE

 
       Date of Publication:          New Worldscale Large Range 1
                                       "Points" (percentage of
                                          Worldscale 100 Rate)
 
       July 1997                             141.5
       August 1997                           137.1
       September 1997                        129.6
 
       AVERAGE:                              136.067
 

ii.  WORLDSCALE 100 OR "FLAT" RATE FOR A VOYAGE FROM SINGAPORE TO BARBERS PT.
     HAWAII

New Worldscale 100 Rate between Singapore and BHP SBM Barbers Point effective
January 1, 1997 is
       Base voyage Singapore/Barbers Pt.          $10.11 per Metric Ton
       Variable Rate Differential for  Discharge
       At BHPPAR SBM                              $0.15 per Metric Ton
                                                  ---------------------
                                                  $10.26 PER METRIC TON

iii. COMPUTATION OF TANKER MARKET FREIGHT INDEX PER METRIC TON

F5   =  ($10.26/MT *(136.067/100))

     =  $13.96047 PER METRIC TON

iv.  CONVERSION OF TANKER MARKET FREIGHT INDEX FROM USD PER METRIC TON TO USD
     PER BARREL

     =  ($13.96047 MT/6.75 bbls/MT)

F5 =  $2.068 PER BARREL

FRD1 =  A fixed rate differential for SBT Tankers, if and as provided by
Worldscale, with respect to the Additional Insurance Premium for Basic ($500
Million) coverage of Oil Pollution Liability Insurance on vessels carrying
persistent oils to and from the U.S.A., consistent with a typical vessel derived
in Exhibit C attached to this Contract; plus,


                                       5
<PAGE>
 
FRD1 =  $.012 PER BARREL, DERIVED AS ILLUSTRATED IN EXHIBIT C ATTACHED
        HERETO.

FRD2 =  A fixed rate differential for SBT Tankers, if and as provided by
        Worldscale, with respect to the Additional Insurance Premium for Excess
        ($200 Million) coverage of Oil Pollution Liability Insurance on vessels
        carrying persistent oils to and from the U.S.A., consistent with a
        typical vessel derived in Exhibit C attached to this Contract.

FRD2 =  $.008 PER BARREL, DERIVED AS ILLUSTRATED IN EXHIBIT C ATTACHED
        HERETO.

F3  =   F5 + FRD1 + FRD2

    =   $2.068/Bbl + $.012/Bbl + $.008/Bbl

F3  =   $2.088 PER BARREL

F4   = $1.825 PER BARREL

T  =   The Hawaii General Excise Tax, the Hawaii Environmental Response Tax
       and any other tax properly imposed on the sale of Product, including:.

HGET = 4.166% of pre-HGET price

Hawaii Environmental Response Tax applied after HGET = $0.05 per barrel

A. PRODUCT PRICE COMPUTATION FOR DELIVERY WITH STANDARD BTU CONTENT OF 6.2 MM
   BTU PER BARREL

            [---]
= [---]
= [---]
= [---]

                                       6
<PAGE>
 
= [---] PER BARREL

B. PRODUCT PRICE COMPUTATION FOR DELIVERY WITH BTU CONTENT OTHER THAN STANDARD
   6.2 MM BTU PER BARREL

            [---]

IF F2, BTU CONTENT IS 6.275 MM BTU PER BARREL, THEN COMPUTATION IS AS FOLLOWS:

= [---]
= [---]
= [---]
= [---] PER BARREL



EXPLANATION OF TAXES:
- --------------------
Taxes in the LSFO price currently in effect include the Hawaii Environmental
Response Tax of $0.050 per barrel. Also, Hawaii State General Excise Tax of
4.166% will be paid on all components of the Product Price, except at the
execution of this Contract, the Hawaii Environmental Response Tax.

                                       7
<PAGE>
 
                                   EXHIBIT C
                                   ---------

                  EXAMPLE DETERMINATION OF FREIGHT COMPONENTS
                  -------------------------------------------

                            PURSUANT TO ARTICLE VI
                            ----------------------

     Article VI of this Contract provides for the determination of the price per
physical barrel of LSFO; which price determination includes the use of a tanker
freight component which references the Worldscale 100 rate for voyages between
Singapore and Barbers Point, Hawaii, expressed in New Worldscale rates, as
published by Worldscale Associates (London) Limited in its New Worldwide Nominal
Freight Scale ("Worldscale"). The current edition of Worldscale incorporates a
Fixed Rate Differential to reflect the cost of additional insurance premiums for
Oil Spill Liability Insurance on vessels carrying Persistent Oils applicable to
voyages having a destination in the U.S.A. SELLER acknowledges that any vessel
used to transport LSFO that is sold and purchased under this Contract, including
its components and the crude oil from which the LSFO is derived, shall be
required to possess oil spill liability insurance coverage in the amount of $700
million.

     The price formula component "F5" refers to an AFRA rate applicable to a
vessel size classification of LR-1, or Large Range 1. This vessel classification
references tanker vessels ranging in size from 45,000 Long Tons Deadweight to
79,999 Long Tons Deadweight. In order to derive an approximation of the
relationship between Deadweight and Gross Registered Tons for a nominal vessel
consistent with this vessel size classification, the average size
characteristics of two vessels that have transported LSFO or crude oil to Hawaii
are used as reference data. These vessels are described as follows:

 
     Name                 Deadweight Tons(DWT)   Gross Registered Tons(GRT)
     ----                 --------------------   --------------------------
 
    S/T ARCO Prudhoe Bay              71,342                 35,646
    S/T ARCO Sag River                71,342                 35,646
                                      ------                 ------
          Average                     71,342                 35,646

     The Worldscale rate data that is to be included in the computation of
tanker freight price formula components "FRD1" and "FRD2," consistent with the
computation of "F5," is to be derived in the same manner as the following
illustrative example calculations:

                                       1
<PAGE>
 
1.   Worldscale 100 rate in effect from February 20, 1997, onwards shall include
     Fixed Rate Differentials a. and b. below and shall be computed as follows:

       a.   Fixed Rate Differential with respect to the additional insurance
            premiums for Basic $500 million coverage of Oil Pollution Liability
            Insurance on vessels carrying Persistent Oils to and from the
            U.S.A., "FRD1" is derived:

            FRD1                =    $0.16/GT  *  35,646 GRT
                                     -----------------------
                                             71,342
                                =    $0.080 per Metric Ton

            For illustrative purposes, this rate may be expressed in U.S.
            dollars per barrel as follows:

                                =    $0.080/Metric Ton
                                     -----------------
                                     6.75 barrels/Metric Ton
                                =    $0.012/BARREL

       b.   Fixed Rate Differential with respect to the additional insurance
            premiums for Excess $200 million coverage of Oil Pollution Liability
            Insurance on vessels carrying Persistent Oils to and from the
            U.S.A., "FRD2" is derived:

            FRD2                =    .875 * $0.1205/GT  *  35,646 GRT
                                     --------------------------------
                                                   71,342
                                =    $0.053 per Metric Ton

            For illustrative purposes, this rate may be expressed in U.S.
            dollars per barrel as follows:

                                =    $0.053/Metric Ton
                                     -----------------
                                     6.75 barrels/Metric Ton
                                =    $0.008/BARREL

     For informational purposes, the total applicable Fixed Rate Differential is
     equal to $0.133 per Metric Ton, or $0.020 PER BARREL.

2.   The AFRA Worldscale Points and their related Worldscale 100 rate applicable
     for each calendar quarter are based upon an average of the three Monthly
     AFRA publications in

                                       2
<PAGE>
 
     the calendar quarter immediately preceding the calendar quarter of the
     Nominated Month of delivery. Therefore the relevant Fixed Rate
     Differentials computed above may properly be prorated for certain quarterly
     periods. Such proration may be computed as follows:

     A.   With respect to volumes of LSFO Nominated during the three (3) Months
          of the calendar quarter following a change in the published Worldscale
          rate (typically February of each Year), the relevant Fixed Rate
          Differentials to be included in the computation of the tanker freight
          price formula component shall be prorated for illustrative purposes as
          follows (for the first calendar quarter of a Year which is not a leap
          Year):

          50/90 multiplied by the Fixed Rate Differential computed prior to the
          rate change.

          and 40/90 multiplied by the Fixed Rate computed using the revised
          rate.



     B.   With respect to volumes of LSFO Nominated for subsequent Months, and
          continuing for so long as the Fixed Rate Differentials as set forth in
          Worldscale Circular shall be applicable, the relevant Fixed Rate
          Differentials to be included in the computation of the price
          components "FRD1" and "FRD2" shall be as derived as in part 1 above.


                                       3

<PAGE>
 
                                                              HECO Exhibit 10.12
                                                              ------------------



               INTER-ISLAND INDUSTRIAL FUEL OIL AND DIESEL FUEL 
                                SUPPLY CONTRACT


                                by and between


                     BHP PETROLEUM AMERICAS REFINING INC.


                                      and


                HAWAIIAN ELECTRIC COMPANY, INC.; MAUI ELECTRIC 
             COMPANY, LIMITED; AND HAWAII ELECTRIC LIGHT COMPANY, 
                                     INC.


                                * * * * * * * *
<PAGE>
 
                               TABLE OF CONTENTS
<TABLE>
<CAPTION>

                                   ARTICLE                                               PAGE 
<S>                                                                                      <C>  
ARTICLE I:          Definitions                                                            1  
     Section 1.1                                                                           1  
     Section 1.2:   Buyer                                                                  7  
ARTICLE II:         Term                                                                   8  
ARTICLE III:        Quantity                                                               8  
     Section 3.1:   Minimum And Maximum Annual Quantities                                  8  
     Section 3.2:   Effect of Purchase Power Agreements (PPA)                              10  
ARTICLE IV:         Quality                                                                11 
ARTICLE V:          Price, BTU Determination                                               12 
     Section 5.1:   Fuel Oil Price                                                         12 
     Section 5.2:   Diesel Price                                                           13 
     Section 5.3:   Taxes, Assessments, Levies and Imposts                                 16 
     Section 5.4:   Successor Publications                                                 17 
     Section 5.5:   Determination of BTU Content                                           17 
ARTICLE VI:         Payment                                                                19 
     Section 6.1:   Invoices                                                               19 
     Section 6.2:   Method of Payment                                                      20 
     Section 6.3:   Payments                                                               21 
     Section 6.4:   Interest                                                               22 
ARTICLE VII:        Deliveries, Title and Risk of Loss                                     23 
     Section 7.1:   Delivery, Title and Risk of Loss                                       23 
     Section 7.2:   Delivery of Diesel and Fuel Oil to MEC and HELCO                       23 
     Section 7.3:   Forecast and Notice of Delivery                                        26 
     Section 7.4:   Delivery Operations, Laytime and Demurrage                             27 
     Section 7.5:   Delivery Operations At SELLER's SPM                                    29 
     Section 7.6:   Pollution Mitigation                                                   31 
     Section 7.7:   Oil Spill Liability And Insurance                                      32 
ARTICLE VIII:       Measurement, Sampling  and Testing                                     33 
     Section 8.1:   Independent Inspection                                                 33 
     Section 8.2:   Determination of Quantity                                              33 
     Section 8.3:   Sampling And Determination of Quality                                  34 
     Section 8.4:   Dispute                                                                37 
ARTICLE IX:         [---]                                                                  38 
ARTICLE X:          Force Majeure                                                          40 
     Section 10.1:  Force Majeure                                                          40 
     Section 10.2:  Obligations Suspended                                                  40 
     Section 10.3:  Notice of Force Majeure                                                40 
     Section 10.4:  No Make-Up Requirement                                                 41 
ARTICLE XI:         Price and Allocation Controls                                          41 
     Section 11.1:  Regulatory Price Suspension                                            41  
</TABLE> 

                                       ii
<PAGE>
 
<TABLE> 
<S>                                                                                        <C> 
     Section 11.2:  Government Regulations                                                  42
ARTICLE XII:        Assignment                                                              42
ARTICLE XIII:       Applicable Law                                                          43
ARTICLE XIV:        Public Utilities Commission Approval                                    43
ARTICLE XV:         Entire Agreement, Waiver and Illegality                                 43
     Section 15.1:  Entire Agreement And Waiver                                             43
     Section 15.2:  Notices                                                                 44
ARTICLE XVI:        [---]                                                                   45
ARTICLE XVII:       Buyer's Use of Seller's Facilities on Maui and Hawaii                   45
ARTICLE XVIII:      Indemnity                                                               46
ARTICLE XIX:        Default                                                                 47
ARTICLE XX:         Counterparts                                                            48
Addendum No. 1:     [---]                                                                   1-1
     Section 1:     Introduction                                                            1-1
     Section 2:     [---]                                                                   1-2
     Section 3:     Safe Operation                                                          1-3
     Section 4:     Maintenance                                                             1-4
     Section 5:     Additions Or Modifications                                              1-4
     Section 6:     Forecast, Scheduling, Notice And Demurrage                              1-5
     Section 7:     Determination Of  Shipment Quantity                                     1-8
     Section 8:     Title And Risk Of Loss                                                  1-8
     Section 9:     Line Displacement                                                       1-8
     Section 10:    Throughput Fees And Other Expenses                                      1-9
     Section 11:    Invoices                                                                1-11     
     Section 12:    [---]                                                                   1-11
     Section 13:    Oil Spill Clean Up Expense                                              1-12
     Section 14:    Consequential Damages                                                   1-12
     Section 15:    Vessel Requirements                                                     1-12
     Section 16:    Not A Public Utility                                                    1-12
     Section 17:    Assignment                                                              1-13
     Section 18:    Parties' Rights                                                         1-13
 Addendum No. 2:    Seller's Facilities on Maui and Hawaii                                  2-1
     Section 1:     Availability, Forecast, Option, Throughput, Quality,
                    Delivery Size And Services                                              2-1
     Section 2:     BUYER's Advice of Shipment of Received Diesel                           2-2
     Section 3:     Barge Received Sample                                                   2-3
     Section 4:     Conditional Acceptance of Received Diesel                               2-3
     Section 5:     Quality Problem, Dispute And Remedy Regarding                              
                    Received Diesel                                                         2-4
     Section 6:     Coast Guard Dock Watch Requirements                                     2-7
     Section 7:     Custody of Received Diesel And Commingled Product                       2-7
     Section 8:     Determination of Quantity of Received Diesel                            2-8
     Section 9:     Transfer Notification                                                   2-8 
</TABLE> 

                                      iii
<PAGE>
 
<TABLE> 
<S>                                                                                         <C>   
     Section 10:    Custody of Returned Diesel                                               2-8
     Section 11:    Determination of Quantity of Returned Diesel                             2-8
     Section 12:    Determination of BUYER's Inventory                                       2-9
     Section 13:    Returned Diesel Quantity                                                 2-9
     Section 14:    Returned Diesel Sampling and Conditional Acceptance                      2-9
     Section 15:    Quality Problem, Dispute and Remedy Regarding                               
                    Returned Diesel                                                          2-10
     Section 16:    Terminaling and Handling Fees                                            2-12
     Section 17:    Required Insurance                                                       2-13
     Section 18:    Barge and Vehicle Standards                                              2-15
     Section 19:    Notices                                                                  2-15
Exhibit A:          No. 6 Industrial Fuel Oil Specifications                                 A-1
Exhibit B:          Diesel Specifications                                                    B-1
Exhibit C:          No. 6 Fuel Oil Example Price Calculation                                 C-1
Exhibit D:          Diesel Example Price Calculation                                         D-1 
</TABLE>

                                       iv
<PAGE>
 
                       INTER-ISLAND INDUSTRIAL FUEL OIL
                        AND DIESEL FUEL SUPPLY CONTRACT
                        -------------------------------

          This Contract is made and entered into this 14th day of November,
1997, by and between BHP PETROLEUM AMERICAS REFINING INC., a Hawaii corporation,
(hereinafter called "SELLER"), and HAWAIIAN ELECTRIC COMPANY, INC., and its
wholly-owned subsidiaries MAUI ELECTRIC COMPANY, LIMITED. and HAWAII ELECTRIC
LIGHT COMPANY, INC., Hawaii corporations, (hereinafter collectively called
"BUYER").

          NOW, THEREFORE, the parties agree as follows:

                                   ARTICLE I

                                  DEFINITIONS
                                  -----------
SECTION 1.1
- -----------
          Except where otherwise indicated, the following definitions shall
apply throughout this Contract:

1. "Additional Term" means any Contract term in addition to and after the
   Original Term, each of which is a 12-Month period, beginning January 1.

2. "API" means American Petroleum Institute, a long-established petroleum
   industry organization.

3. "ASTM" means the American Society for Testing and Materials, a long-
   established source of standard testing and evaluation methods for petroleum.

                                       1
<PAGE>
 
4. "BUYER's Barbers Point Storage Facilities" means BUYER's petroleum storage
    and distribution facilities, including but not limited to BPTF, located in
    the Barbers Point area of Oahu, in Campbell Estate Industrial Park, Kapolei,
    Hawaii.

5.  "barrel" means 42 United States Gallons at 60 degrees Fahrenheit.

6.  "BHP" means BHP Petroleum Americas Refining Inc.

7.  "BPTF" means BUYER's Barbers Point Tank Farm petroleum storage and
    distribution facilities located in the Barbers Point area of Oahu, in
    Campbell Estate Industrial Park, Kapolei, Hawaii.

8.  "BTU Content" means British Thermal Unit content and refers to the standard
    assessment of gross heat of combustion, gross heating value and gross heat
    content of Product determined in accordance with the test method specified
    in Exhibits A and B.

9.  "BUYER's Nominated Barge" means a petroleum tank barge or vessel designated
    by BUYER to receive Product Delivered by SELLER.

10. "BUYER's Nominated Marine Terminal" means a petroleum receiving, storage and
    distribution facility designated by BUYER to receive Product Delivered by
    SELLER.

11. [---] means a [---]

12. "[---] means [---] respectively.

                                       2
<PAGE>
 
13. [---] means [---]

14. "Certificate of Quality" means the formal document recording SELLER's
    laboratory determination of the quality and BTU Content of a particular
    sample which represents a specific Delivery of Product, said laboratory
    determinations having been performed in accordance with the test methods
    specified in Exhibits A and B.

15. "Certificate of Quantity" means the formal document recording the
    measurements and quantity determination of a specific Delivery of Product
    prepared under the supervision of the Independent Inspector; said
    Certificate may be a part of or incorporated into the report of the
    Independent Inspector.

16. "Contract" means this Inter-Island Industrial Fuel Oil and Diesel Fuel
    Supply Contract, between BHP Petroleum Americas Refining Inc. and Hawaiian
    Electric Co., Inc., Maui Electric Co., Ltd. and Hawaii Electric Light Co.,
    Inc., the term of which commences January 1. 1998.

17. "Day" or "Days" means a calendar day of 24 hours.

18. "Deliver," "Delivery," "Deliveries," or "Delivered" refers to the physical
    movement of Product or transfer of title attendant upon the sale of Product
    by SELLER and its receipt and purchase by BUYER which commences at the
    initiation of pumping from SELLER's Refinery tank(s), SELLER's Nominated
    Terminal issuing tank(s) or SELLER's Nominated Barge cargo tank(s) to
    BUYER's Nominated Barge or BUYER's Nominated Marine Terminal and ends with
    the subsequent cessation of continuous pumping of the Product.

                                       3
<PAGE>
 
19. "DF" means degrees Fahrenheit.

20. "Diesel" or "Diesel Fuel" means Diesel Fuel Oil No. 2 in accordance with
    Article IV and Exhibit B.

21. "diesel" means Diesel, SELLER's diesel, BUYER's diesel or third-party diesel
    similar in quality to Diesel.

22. "diesel Preliminary Analysis" means an preliminary qualitative analysis to
    be performed at the option of SELLER on a sample of Received diesel, such
    analysis consisting of tests for API gravity, appearance and flash point.

23. "Force Majeure" means an act or event as per the provisions of Section 10.1.

24. "Fuel Oil" means Industrial Fuel Oil No. 6 in accordance with Article IV and
    Exhibit A.

25. "gallon" means a United States gallon of 231 cubic inches at 60 degrees
    Fahrenheit.

26. "GEOPS" means good engineering and operating practices with reference to
    generally recognized standards promulgated by professional societies,
    industry, materials testing and research organizations.

27. "G.S.V." means gross standard volume in U.S. barrels at 60 degrees
    Fahrenheit.

28. "HECO" means Hawaiian Electric Company, Inc.

29. "HELCO" means Hawaii Electric Light Company, Inc.

30. "Independent Inspector" means a qualified third-party petroleum inspection
    contractor acceptable to both BUYER and SELLER providing petroleum sampling,
    measurement, quantity determination and other such services before, during
    and after a Delivery of Product.

31. "IP" means the Institute of Petroleum, a long-established international
    source of standard testing and evaluation methods for petroleum.

                                       4
<PAGE>
 
32. [---] means [---]

33. "MECO" means Maui Electric Company, Ltd.

34. "MM" means million when used in conjunction with a unit of measure such as
    BTU, i.e. MM BTU means million BTU.

35. "Month" means a calendar Month.

36. "Month of Delivery" means the calendar month during which the physical
    Delivery is completed which is indicated by the cessation of pumping of
    Product and the tanking of final gauge measurements of the issuing or
    receiving tank(s) pursuant to determining the amount of Product Delivered.

37. "NOR" means notice of readiness.

38. "Original Term" means the first term of this Contract which commences
    January 1, 1998 and concludes December 31, 2004.

39. "Product" means both Fuel Oil and Diesel meeting the specifications in
    Exhibit A and B, respectively.

40. "Product Preliminary Analysis" means an preliminary qualitative analysis to
    be performed by SELLER on a sample of Diesel or Fuel Oil from SELLER's
    issuing tanks and delivery piping or SELLER's Nominated Barge prior to
    commencing Delivery operations which is representative of the intended
    Product Delivery, such analysis consisting of tests for API gravity,
    appearance, flash point and sulfur content.

                                       5
<PAGE>
 
41. "Purchase Power Agreement" means an agreement by and between a BUYER and a
    third party for the purchase of firm capacity output from one or more
    generating plants.

42. "Received diesel" means BUYER's diesel to be received into the custody of
    SELLER at SELLER's Neighbor Island Terminals, such diesel may be Diesel or
    third-party diesel of a quality similar to Diesel.

43. "Refinery" means SELLER's oil refining and related facilities located in the
    Barbers Point area of Oahu, in Campbell Estate Industrial Park, Kapolei,
    Hawaii.

44. "Returned diesel" means diesel to returned to the custody of BUYER by SELLER
    at the truck loading rack of SELLER's Neighbor Island Terminals, such
    returned diesel may be Diesel or third-party diesel of a quality similar to
    Diesel having been previously delivered into the custody of SELLER by BUYER
    at SELLER's Neighbor Island Terminals.

45. [---] means a [---]

46. "SELLER's Hilo Terminal" means SELLER's marine petroleum storage and
    distribution terminal facilities located in Hilo, Hawaii.

47. "SELLER's Kahului Terminal" means SELLER's marine petroleum storage and
    distribution terminal facilities located in Kahului, Maui.

48. "SELLER's Loading Pier" means Piers 5, 6 or any such other pier developed
    for or utilized for the purpose of Delivering Product to BUYER, located at
    the Barbers Point Deep Draft Harbor, Oahu, Hawaii, and connected by pipeline
    to SELLER's Refinery.

                                       6
<PAGE>
 
49. "SELLER's Neighbor Island Terminals" means collectively SELLER's Hilo
    Terminal and SELLER's Kahului Terminal.

50. "SELLER's Nominated Barge" means a petroleum tank barge or vessel designated
    by SELLER to Deliver Diesel to BUYER into BUYER's Nominated Marine Terminal.

51. "SELLER's Nominated Terminal" means a petroleum storage and distribution
    terminal facility designated by SELLER from which to Deliver Diesel to BUYER
    into BUYER's Nominated Marine Terminal.

52. "SPM" means SELLER's Single Point Mooring facility, a petroleum tank vessel
    loading and off-loading single-buoy type mooring facility located off shore
    of SELLER's Refinery at Barbers Point, Oahu, Hawaii.

53. "Third-Party Pier" means a pier or wharf or other marine facility, operated
    under the supervision of a third party, nominated by SELLER to be used for
    the purpose of Delivering Product into BUYER's Nominated Barge.

54. "USCG" means U.S. Coast Guard.

55. "USD" means currency denominated in U.S. dollars.

56. "Year" means a calendar Year.

SECTION 1.2: BUYER
- ------------------

          As to any purchase of Product by MECO, the term "BUYER" shall exclude
HELCO, and as to any purchase of Product by HELCO, the term "BUYER" shall
exclude MECO.  Furthermore, for purposes of this Contract (excluding any
payments due from, and liabilities and indemnities attributable to, a BUYER) the
term "BUYER" shall be deemed to mean MECO or

                                       7
<PAGE>
 
HELCO, as applicable, and its authorized agent(s) for this purpose, unless
otherwise specified or clearly inappropriate in the context.

                                  ARTICLE II

                                     TERM
                                     ----

          The Original Term of this Contract shall be from January 1, 1998
through December 31, 2004 and the Contract shall continue thereafter for
Additional Terms, each a successive 12-Month period, beginning January 1, 2005,
unless BUYER or SELLER gives written notice of termination at least one hundred
twenty (120) Days prior to the expiration of the then current term, including
the Original Term and any Additional Term.

                                  ARTICLE III

                                   QUANTITY
                                   --------

SECTION 3.1: MINIMUM AND MAXIMUM ANNUAL QUANTITIES
- --------------------------------------------------

          During each Year that this Contract is in effect, SELLER shall sell
and Deliver to BUYER, and BUYER shall purchase and receive from SELLER, Product
(in barrels) at a reasonably uniform rate of no less than the minimum nor more
than the maximum annual physical quantities, except as otherwise provided
herein, as set out below for each BUYER:

                                       8
<PAGE>
 
                                       Annual Physical Barrels
                                       -----------------------

I.   FUEL OIL

            1998                           MINIMUM   MAXIMUM
            ----                           -------   -------
     HELCO                                 [---]     [---]
     MECO                                  [---]     [---]
       TOTAL                               [---]     [---]

            1999 - 2004                    MINIMUM   MAXIMUM
            -----------                    -------   -------
     HELCO                                 [---]     [---]
     MECO                                  [---]     [---]
       TOTAL                               [---]     [---]
 
II.  DIESEL

            1998                           MINIMUM   MAXIMUM
            ----                           -------   -------
     HELCO                                 [---]     [---]
     MECO                                  [---]     [---]
       TOTAL                               [---]     [---]
                                        

     DIESEL                             
 

            1999 - 2004                    MINIMUM   MAXIMUM
            -----------                    -------   -------
     HELCO                                 [---]     [---]
     MECO                                  [---]     [---]
       TOTAL                               [---]     [---]

          Upon prior written notice to SELLER, HELCO and MECO may modify their
individual minimum and maximum annual physical quantities of Fuel Oil and Diesel
provided that the total minimum annual physical quantities of Fuel Oil and
Diesel which shall be sold and Delivered by

                                       9
<PAGE>
 
SELLER and purchased and received by BUYER collectively, shall fall within the
limits specified in this Section 3.1.

          The volumes of Fuel Oil and Diesel to be sold and Delivered by SELLER
and to be purchased and received by each respective BUYER shown for 2004 shall
also apply to any Additional Term, unless otherwise mutually agreed.  Subject to
availability, SELLER shall sell and Deliver and BUYER shall purchase and receive
such additional volumes in excess of the maximum annual volumes as are mutually
agreed.

SECTION 3.2: EFFECT OF PURCHASE POWER AGREEMENTS (PPA)
- ------------------------------------------------------

          If due to the commencement of commercial operation during the term of
this Contract of a generating plant or generating plants supplying firm capacity
to HELCO or MECO, or an increase in firm capacity output under an existing
contract, in aggregate under one or more Purchase Power Agreements ("PPA") in
excess of 20 megawatts (gross basis), HELCO's or MECO's anticipated demands for
Fuel Oil or Diesel results in BUYER'S total aggregate anticipated demand on an
annual basis during any Year during the term of this Contract for Fuel Oil or
Diesel to decline below the BUYER'S total aggregate minimum annual quantities
set forth in Section 3.1 (the difference between BUYER'S total aggregate
anticipated demand and BUYER'S total aggregate minimum annual quantities being
the "Fuel Requirement Reduction"), then BUYER shall give written notice to
SELLER of BUYER'S request that SELLER accept the Fuel Requirement Reduction.
SELLER shall have fifteen (15) Days within which to accept BUYER'S Fuel
Requirement Reduction or reject BUYER'S Fuel Requirement Reduction and request a
renegotiation of the affected BUYER'S minimum annual quantities of Fuel Oil or
Diesel in Section 3.1 and/or the price of Fuel Oil or Diesel sold and Delivered
by SELLER and

                                       10
<PAGE>
 
purchased and received by the affected BUYER in Article V of this Contract.  If
SELLER either accepts BUYER'S Fuel Requirement Reduction or fails to give any
notice of acceptance or rejection within said 15-Day period, then BUYER'S Fuel
Requirement Reduction shall be deemed to have been accepted by SELLER and shall
become effective upon the expiration of said 15-Day period.  Should SELLER
reject BUYER'S request for the Fuel Requirement Reduction then, within 60 Days
following the date of any such rejection notice, if the parties are unable to
renegotiate the affected BUYER's minimum annual quantities and/or the price for
Fuel Oil or Diesel to be sold and Delivered by SELLER and purchased and received
by the affected BUYER, in a manner mutually satisfactory to both SELLER and
BUYER, then SELLER upon 30 Days written notice, may elect to terminate its
obligation to sell Fuel Oil or Diesel to the affected BUYER under this Contract.
Until (i) Buyers' request for a Fuel Reduction Requirement is accepted or deemed
accepted by Seller, (ii) a mutually satisfactory provision for the affected
BUYER's minimum annual quantities and/or price for Fuel Oil or Diesel sold and
Delivered by SELLER and purchased and received by the affected BUYER, is
renegotiated, or (iii) the obligation to sell Fuel Oil or Diesel to the affected
BUYER under this Contract is terminated in accordance with this Section 3.2, the
terms and conditions of this Contract shall be and remain in full force and
effect.

                                       11
<PAGE>
 
                                   ARTICLE IV

                                    QUALITY
                                    -------

          SELLER shall sell and Deliver and each respective BUYER shall purchase
and receive Fuel Oil and Diesel that shall conform to the specifications set
forth in Exhibits A and B, respectively, attached hereto and incorporated herein
by reference.

                                   ARTICLE V

                           PRICE, BTU DETERMINATION
                           ------------------------

SECTION 5.1: FUEL OIL PRICE
- ---------------------------

          The price in USD per barrel of Fuel Oil shall be determined for each
Month on the basis of the simple average of the high and low price assessments
for Los Angeles Bunker C fuel as reported by the Platt's Oilgram Bunkerwire
("Platt's Bunkerwire") on all dates of publication during the period beginning
the 21st Day of the second Month preceding the Month of Delivery and ending the
20th Day of the Month preceding the Month of Delivery, expressed in USD per
barrel, converting to barrels from metric tons by dividing by 6.368, [---] to
volumes sold and Delivered by SELLER and purchased and received by BUYER in each
Year of the indicated period as set forth below:

[---]

          [---] barrels:    [---] per barrel

          [---] barrels:    [---] per barrel

                                       12
<PAGE>
 
          [---] barrels:    [---] per barrel

[---]

          [---] barrels:    [---] per barrel

          [---] barrels:    [---] per barrel

          [---] barrels:    [---] per barrel

The per barrel premium applicable to Fuel Oil sold and Delivered by SELLER and
purchased and received by BUYER for 2004 shall also apply to Fuel Oil sold and
Delivered by SELLER and purchased and received by BUYER during each Year of any
Additional Term, unless otherwise mutually agreed.

          All prices, price formula, including their averages and factors,
adjustments thereto and other sums payable with respect to Fuel Oil hereunder
shall be stated in the nearest thousandth of a dollar unless specifically stated
otherwise.

          Exhibit C, attached hereto and included herein by reference, contains
an illustrative schedule of prices for Fuel Oil calculated pursuant to this
Section 5.1.

SECTION 5.2: DIESEL PRICE
- -------------------------

          The price in USD of Diesel shall be determined for each Month on the
basis of the simple average of the high and low price assessments for West Coast
Pipeline, Los Angeles California Low Sulfur No. 2 Diesel as reported by Platt's
Oilgram Price Report ("Platt's Oilgram") on all dates of publication during the
period beginning the 21st Day of the second Month preceding the Month of
Delivery and ending the 20th Day of the Month preceding the Month of Delivery,
expressed in USD per gallon, [---] applicable to volumes sold and Delivered by

                                       13
<PAGE>
 
SELLER and purchased and received by BUYER in each Year of the indicated period
as set forth below:

[---]
          [---] barrels:    [---] per gallon

          [---] barrels:    [---] per gallon

          [---] barrels:    [---] per gallon

                                       14
<PAGE>
 
[---]

          [---] barrels:    [---] per gallon

          [---] barrels:    [---] per gallon

          [---] barrels:    [---] per gallon

The per gallon premium applicable to Diesel sold and Delivered by SELLER and
purchased and received by BUYER for 2004 shall also apply to Diesel sold and
Delivered by SELLER and purchased and received by BUYER during each Year of any
Additional Term, unless otherwise mutually agreed.

          For Diesel sold and Delivered in bulk by SELLER via tank transfer from
SELLER's Nominated Terminal facility or via SELLER's Nominated Barge, and
purchased and received in bulk by BUYER at Kahului, Maui, or at Hilo or
Kawaihae, Hawaii, BUYER shall pay an [---] applicable only to such Diesel, in
each Year of the indicated period as noted below:
<TABLE>
          <S>                                                 <C>    <C> 
                                                              [---]  [---]
          [---] per [---] for the
          [---] purchased
          by MECO, Delivered in Kahului Maui, in $/gallon:    [---]  [---]
 
          [---] per [---] for the
          [---] purchased
          by HELCO, Delivered in Hilo Hawaii, in $/gallon.    [---]  [---]
 
          [---] per [---] for the
          [---] purchased
          by HELCO, Delivered in Kawaihae Hawaii,
          in $/gallon.                                        [---]  [---]
</TABLE>

                                       15
<PAGE>
 
The [---] applicable to Diesel sold and Delivered by SELLER and purchased and
received by BUYER for 2004 shall also apply to Diesel sold and Delivered by
SELLER and purchased and received by BUYER during each Year of any Additional
Term, unless otherwise mutually agreed.

          All prices, price formula, including their averages and factors,
adjustments thereto and other sums payable with respect to Diesel hereunder
shall be stated in the nearest ten-thousandth of a dollar unless specifically
stated otherwise.

          Exhibit D, attached hereto and included herein by reference, contains
an illustrative schedule of prices for Diesel calculated pursuant to this
Section 5.2.

SECTION 5.3: TAXES, ASSESSMENTS, LEVIES AND IMPOSTS
- ---------------------------------------------------

          In addition to all other amounts payable by BUYER under this Contract,
BUYER shall reimburse SELLER for all taxes, assessments, levies, and imposts of
whatsoever kind or nature imposed on SELLER by any governmental or quasi-
governmental body, as adjusted, modified or revised from time to time, including
without limitation the Hawaii General Excise Tax, the Hawaii Environmental
Response Tax, and pertaining to sales and purchases of Diesel, the Hawaii Liquid
Fuel Tax, with respect to the execution or performance of this Contract or the
receipt by SELLER of payments hereunder.  Notwithstanding the foregoing and any
illustrative price calculation, such as contained in Exhibits C and D, BUYER
shall not be required to reimburse SELLER for any tax measured by or based on
the net income of SELLER or for real property taxes or to duplicate any item of
expense of SELLER which is recovered by SELLER under the Fuel Oil and Diesel
prices provided for in Section 5.1 and Section 5.2, respectively. BUYER shall
not be required to reimburse SELLER under this Article V for any item expressly

                                       16
<PAGE>
 
mentioned by Platt's Bunkerwire or Platt's Oilgram or confirmed by Platt's
Bunkerwire or Platt's Oilgram in writing upon inquiry by either BUYER or SELLER,
as being included in a price assessment incorporated in Article V.  There shall
be no modification in the calculation of any unit of measure conversion, BTU
Content adjustment or similar computation of other quality components solely due
to the presence or absence of any tax, assessment, levy, impost or other such
similar item of expense contained in any such component. At the execution of
this Contract, the taxes, assessments, levies or imposts which are currently in
effect include the Hawaii General Excise Tax (4.166%), the Hawaii Environmental
Response Tax ($0.05 per barrel or $0.0012 per gallon) and pertaining to Diesel,
Hawaii Liquid Fuel Tax ($0.0100 per gallon).  Also at the execution of this
Contract, the Hawaii Environmental Response Tax and Hawaii Liquid Fuel Tax are
not subject to Hawaii General Excise Tax.

SECTION 5.4: SUCCESSOR PUBLICATIONS
- -----------------------------------

          Platt's Bunkerwire and Platt's Oilgram shall include any successor
publication(s) and, in the event of discontinuance of either of these
publications or the assessments of Los Angeles Bunker C Fuel Oil or West Coast
Pipeline, Los Angeles California Low Sulfur No. 2 Diesel, respectively, the
parties shall mutually agree upon the use of alternate reporting services or
publications or similar price assessments and any resulting modification of the
per barrel [---] for Fuel Oil or per gallon [---] for Diesel, as applicable, as
may be reasonable under the circumstances.

SECTION 5.5: DETERMINATION OF BTU CONTENT
- -----------------------------------------

          Should the weighted average BTU Content per barrel of the
representative samples of Fuel Oil sold and Delivered by SELLER and purchased
and received by each respective BUYER

                                       17
<PAGE>
 
during any calendar quarter, and drawn in accordance with the procedures set
forth in Article VIII, fall within the range of [---] no price adjustment will
be made.  If the weighted average BTU Content per barrel [---] the price charged
for the Fuel Oil sold and Delivered to that respective BUYER during the calendar
quarter in question shall be adjusted by multiplying the price determined in
Section 5.1, by the [---] Exhibit C contains an illustrative schedule of prices
for Fuel Oil adjusted with reference to BTU Content calculated pursuant to this
Section 5.5.

          Should the weighted average BTU Content per gallon of the
representative samples of Diesel sold and Delivered by SELLER and purchased and
received by each respective BUYER during any calendar quarter, and drawn in
accordance with the procedures set forth in Article VIII, fall [---] If the
weighted average BTU Content per gallon is [---] the price charged for the
Diesel sold and Delivered to that respective BUYER during the calendar quarter
in question shall be adjusted by multiplying the price determined in Section
5.2, by the [---] Exhibit D contains an illustrative schedule of prices for
Diesel adjusted with reference to BTU Content calculated pursuant to this
Section 5.5.

          The official BTU Content determination shall be based upon SELLER's
laboratory results provided that the arithmetic difference between SELLER's and
BUYER's laboratory results is equal to or less than the then existing ASTM
reproducibility standard (currently 0.4 MJ/kg, which shall be deemed by the
parties as equivalent to 60,000 BTU per barrel for an individual

                                       18
<PAGE>
 
Delivery of Fuel Oil sold and Delivered by SELLER and purchased and received by
a respective BUYER, and deemed by the parties as equivalent to 1,200 BTU per
gallon for any individual Delivery of Diesel sold and Delivered by SELLER and
purchased and received by a respective BUYER) for test D-240. If the difference
between SELLER's and BUYER's laboratory results should fall outside the ASTM
reproducibility standard for ASTM test D-240, the sealed sample in the
possession of the Independent Inspector will be provided to an independent
laboratory for an official determination, which shall be binding upon the
parties. SELLER and BUYER shall share equally the costs of independent tests and
determinations.

          SELLER shall credit BUYER's account for overpayments and BUYER shall
pay SELLER for underpayments resulting from price corrections for invoiced
Deliveries made as a result of BTU Content adjustments as soon as possible after
the close of each calendar quarter, but in no event later than sixty (60) Days
after the close of a calendar quarter.  Such adjustments to either BUYER or
SELLER will be handled as separate credits or invoices and invoices issued with
respect to individual Deliveries during said calendar quarter will not be
corrected and reissued.

                                  ARTICLE VI

                                    PAYMENT
                                    -------
SECTION 6.1: INVOICES
- ---------------------

          Invoices shall be prepared by SELLER and dated after a Delivery has
been completed.  A [---] SELLER will transmit an original of the invoice to the
BUYER [---] to the address set forth in Section 6.2.

                                       19
<PAGE>
 
Original invoices shall be accompanied by full documentation, reasonably
acceptable to the BUYER, such as, but not limited to, Certificate of Quality,
Certificate of Quantity or report of the Independent Inspector and price
calculation.

          Invoices which have been so prepared shall be sent to the respective
BUYER at the following addresses:

          MECO  -   MAUI ELECTRIC COMPANY, LTD.
                    P. O. BOX 398
                    KAHULUI, HAWAII  96732
                    ATTENTION:  R. CUGAL/PRODUCTION DEPARTMENT
                    FACSIMILE: 808-244-5260

          HELCO -   HAWAII ELECTRIC LIGHT CO., INC.
                    P. O. BOX 1027
                    HILO, HAWAII  96720
                    ATTENTION:  PRODUCTION DEPARTMENT
                    FACSIMILE: 808-969-0435

          Certificate of Quality, laboratory analyses, reports of the
Independent Inspector and other documents having to do with the quantity,
quality and Delivery of Diesel and Fuel Oil to BUYER, or otherwise with the
Diesel and Fuel Oil sold and purchased hereunder, shall be sent to the
respective BUYER and to BUYER's agent at the address in Section 15.2 of this
Contract.

SECTION 6.2: METHOD OF PAYMENT
- ------------------------------

          Payments shall be made in USD.  Timing of payments of invoices sent to
each respective BUYER shall be as follows:

          a.  Payment for Deliveries and services from the first through the
              tenth Day of a Month for which invoices have been received by the
              fourteenth of that same Month is due on the twentieth Day of said
              Month.

                                       20
<PAGE>
 
          b.  Payment for Deliveries and services from the eleventh through the
              twentieth Day of a Month for which invoices have been received by
              the twenty fourth of that same Month is due on the last Day of
              said Month.

          c.  Payment for Deliveries and services from the twenty-first through
              the last Day of a Month for which invoices have been received by
              the fourth of the following Month is due on the tenth Day of said
              following Month.

For payment timing purposes in this Section 6.2, invoices shall be deemed to
have been received on the date of an invoice's postmark. Due dates are dates
payments are to reach SELLER.  If the due date falls on a Friday, holiday or a
Saturday, the payment shall be due on the preceding business day.  If such date
falls on a Sunday or a holiday falling other than on a Friday, payment shall be
due the following business day.

          Payment shall be made by each BUYER by bank wire transfer of
immediately available funds to:

                              Citibank, New York
                                ABA # 021000089
                     BHP Petroleum Americas Refining Inc.
                               Account #40643342

SECTION 6.3: PAYMENTS
- ---------------------

          If a debit memo incorporating an adjustment to a previously issued
invoice has been sent to BUYER, subsequent to BUYER making payment of said
original invoice, then BUYER shall make payment in accordance with the
provisions of this Section 6.1.  If a credit memo

                                       21
<PAGE>
 
incorporating an adjustment to a previously issued invoice has been sent to
BUYER, subsequent to BUYER making payment of said original invoice, then BUYER
shall have the option to apply such credit against payments to be made
subsequent to the receipt of the credit, or if such payments are not expected to
be made within twenty (20) Days, BUYER shall be able to receive said credit in
immediately available funds within three (3) business days of SELLER's receipt
of BUYER's written instructions.

          If an invoice incorporating an item at variance with the
documentation, or is disputed, has been sent to BUYER, then BUYER shall hold
said invoice without penalty until such error, variance with documentation or
dispute is resolved and BUYER shall have received a corrected invoice or debit
or credit issued subsequently to the original invoice. BUYER shall make payment
for such subsequent invoices or debits in accordance with the provisions of this
Section 6.2.

SECTION 6.4: INTEREST
- ---------------------

          At SELLER's option and election, interest will accrue on all amounts,
other than invoice items or amounts in dispute, not paid in accordance with the
provisions of this Article VI at the [---]

                                       22
<PAGE>
 
                                  ARTICLE VII

                      DELIVERIES, TITLE AND RISK OF LOSS
                      ----------------------------------

SECTION 7.1: DELIVERY, TITLE AND RISK OF LOSS
- ---------------------------------------------

          SELLER agrees to Deliver and BUYER agrees to receive Product into
BUYER's Nominated Barge, at SELLER's Loading Pier, Third-Party Pier or at
SELLER's SPM pursuant to Section 7.4. For Product Delivered by SELLER into
BUYER's Nominated Barge, at SELLER's Loading Pier, SPM, Third-Party Pier or
other place of loading nominated by SELLER, title, custody and risk of loss of
Product so Delivered shall pass from SELLER to BUYER at the receiving flange of
BUYER's Nominated Barge, for loadings at the SPM, or the flange of the receiving
hoses of BUYER's Nominated Barge.

          On a when-available basis and when the date is mutually agreed to,
SELLER may sell and Deliver and BUYER may purchase and receive Diesel in bulk
into BUYER's Nominated Marine Terminal at Kahului, Maui and Hilo and Kawaihae,
Hawaii, respectively.  Title, custody and risk of loss of Diesel so Delivered
shall pass from SELLER to BUYER at the flange of the receiving pipeline of
BUYER's Nominated Marine Terminal.

SECTION 7.2: DELIVERY OF DIESEL AND FUEL OIL TO MECO AND HELCO
- --------------------------------------------------------------

          The Delivery rate and receiving capability of BUYER's Nominated Barge
for Fuel Oil shall be [---] barrels per hour minimum for a Delivered volume of
Fuel Oil in excess of [---] barrels. The Delivery rate and receiving capability
of BUYER's Nominated Barge for Diesel shall be [---] barrels per hour minimum
for a Delivered volume of Diesel in excess of [---] barrels.  SELLER agrees to
make a reasonable good faith effort to load Diesel and Fuel Oil concurrently;
provided, however, that BUYER's Nominated Barge is capable of receiving same.

                                       23
<PAGE>
 
Fuel Oil will be Delivered into BUYER's Nominated Barge at a temperature above
[---]. The gross volume of Fuel Oil per individual Delivery to the Nominated
Barge of a respective BUYER shall be limited to a minimum of [---] barrels and a
maximum of [---] barrels.   The gross volume of Diesel per individual Delivery
to the Nominated Barge of a respective BUYER shall be limited to a minimum of [-
- --] barrels and a maximum of [---] barrels.  BUYER may receive a quantity in
excess of said maximum Delivery volumes of Fuel Oil and Diesel as may be
mutually agreed.

          The Delivery rate of Diesel into BUYER's Nominated Marine Terminal at
Kahului, Maui and Hilo and Kawaihae, Hawaii, respectively, shall be [---]
barrels per hour minimum. The respective BUYER is responsible for providing
discharge facilities through an independent third party; and SELLER has no
responsibility to procure discharge facilities on the islands of Maui and Hawaii
for the sole purpose of making Deliveries of Diesel in bulk from SELLER's
Nominated Barge or in bulk via tank transfer from SELLER's Nominated Terminal on
behalf of the respective BUYER.

          When SELLER's Nominated Barge is used to Deliver Diesel to BUYER's
Nominated Marine Terminal:

          a. SELLER's Nominated Barge shall comply with all applicable federal,
             state and local laws, rules and regulations.

          b. SELLER shall be responsible for scheduling dock space in Kahului,
             Maui, and Kawaihae and Hilo, Hawaii, for SELLER's Nominated Barge.

          c. Dues and other charges on SELLER's Nominated Barge (whether or not
             such dues or charges are based on the quantity of Product loaded or
             on the freight and without

                                       24
<PAGE>
 
             regard from whom such dues or charges are withheld), taxes on
             freight and any State fee imposed for use of a pier, wharf or
             pipeline used during the discharge of SELLER's Nominated Barge
             shall be paid by SELLER.

          d. SELLER shall employ and also be responsible for costs of any
             support vessels, pilots, mooring masters, line handlers, or
             tankermen required all of which shall become borrowed servants of
             SELLER.

          e. BUYER shall be responsible for reasonable invoiced expenses
             associated with hose watch personnel and dockside operations
             employed to attend the Delivery of cargo to BUYER prorated on the
             basis of the ratio of the volume of cargo Delivered to BUYER to the
             total volume to cargo discharged from SELLER's Nominated Barge.

          f. Neither BUYER, nor any of its associated or affiliated companies,
             nor any of the employees, servants, representatives and agents of
             any of the foregoing, shall be responsible for any losses, damages,
             delays or liabilities resulting from any negligence, incompetence
             or incapacity of any tug boat, pilot, line handler, tankermen
             required or employed by SELLER or otherwise assisting SELLER at the
             express authorization of SELLER or SELLER's agent or the personnel
             of any tug(s) or other support vessels or arising from any
             unseaworthiness or any insufficiency of any tug or other support
             vessel employed by SELLER or otherwise assisting SELLER at the
             express authorization of SELLER or SELLER's agent and SELLER agrees
             to indemnify and hold BUYER harmless from and against any and all
             such losses, damages, delays or liabilities.

                                       25
<PAGE>
 
          SELLER shall Deliver, and BUYER shall receive, [---] respectively,
which shall be sold and Delivered by SELLER and purchased and received by BUYER
collectively each calendar quarter.

SECTION 7.3: FORECAST AND NOTICE OF DELIVERY
- --------------------------------------------

          Prior to the [---] Day of each Month, BUYER shall give SELLER a
forecast of the total volume of each respective BUYER's liftings of Diesel and
Fuel Oil for each of the subsequent three (3) Months.  In addition, and also
prior to the [---] Day of each Month, BUYER shall provide SELLER a voyage
schedule of BUYER's Nominated Barge for the following Month.  Such schedule
shall show the expected place, date and time of the commencement of each loading
operation.  BUYER recognizes the importance to SELLER of reasonably accurate
lifting forecasts because of SELLER's need to plan Refinery production and
shipments.  BUYER shall make a reasonable attempt to schedule barges to lift
Product ratably through the Month and Year.

          BUYER shall be responsible for scheduling dock space at SELLER's
Loading Pier for BUYER's Nominated Barge with the State of Hawaii Department of
Transportation - Harbors Division and provide SELLER [---] hour notice of the
proposed loading time. BUYER shall also provide [---] hours notice to SELLER
during SELLER's regular business hours Monday through Friday (excluding
holidays) of the final quantity to be loaded, subject to a plus or minus 10%
loading tolerance; provided, however, that in the event of a loading on [---]
BUYER shall provide SELLER notice of the final quantity to be loaded, subject to
a plus or minus 10% loading tolerance, by [---]

                                       26
<PAGE>
 
SECTION 7.4: DELIVERY OPERATIONS, LAYTIME AND DEMURRAGE
- -------------------------------------------------------

          BUYER's Nominated Barge shall comply with all applicable federal,
state and local laws, rules and regulations, and SELLER's vessel acceptance
standards, such as that portion of the "BHP Transport Petroleum Tanker
Inspection Checklist" as may be applicable to unmanned petroleum tank barges and
shall be fit in every way to receive and carry Product.  SELLER shall provide
BUYER its Operations Manual, relevant portion of the BHP Transport Petroleum
Tanker Inspection Checklist and any other applicable safety and operations
procedures and vessel acceptance standards, and any amendments thereto, during
the term of this Contract.  While at SELLER's Loading Pier, BUYER's Nominated
Barge shall operate in compliance with SELLER's Operations Manual as approved by
the USCG.  In addition, a minimum of two qualified tankermen shall be provided
by BUYER's barge during all loading operations at SELLER's Loading Pier or
Third-Party Pier.

          BUYER's Nominated Barge shall vacate SELLER's Loading Pier or Third-
Party Pier as soon as loading is completed, except if such delay is caused by
any event or acts beyond the reasonable control of BUYER, including but not
limited to acts of God, fire, governmental acts or labor disturbances.

          Dues and other charges on BUYER's Nominated Barge (whether or not such
dues or charges are based on the quantity of Product loaded or on the freight
and without regard from whom such dues or charges are withheld) shall be paid by
BUYER.  Any taxes on freight shall be borne by BUYER. BUYER shall be responsible
for any State fee imposed for use of SELLER's Loading Pier or Third-Party Pier
in the nature of wharfage or pipeline toll.  BUYER shall employ and also be
responsible for costs of any support vessels, pilots, mooring masters, or

                                       27
<PAGE>
 
line handlers supplied by SELLER or otherwise required at SELLER's Loading Pier,
SPM, or Third-Party Pier, all of which shall become borrowed servants of BUYER.

          Neither SELLER, nor any of its associated or affiliated companies, nor
any of the employees, servants, representatives and agents of any of the
foregoing, shall be responsible for any losses, damages, delays or liabilities
resulting from any negligence, incompetence or incapacity of any pilot, line
handler, mooring master required at SELLER's Loading Pier, SPM or Third-Party
Pier or employed by BUYER or otherwise assisting BUYER at the express
authorization of BUYER or BUYER's agent or the personnel of any tug(s) or other
support vessels or arising from any unseaworthiness or any insufficiency of any
tug or other support vessel employed by BUYER or otherwise assisting BUYER at
the express authorization of BUYER or BUYER's agent and BUYER agrees to
indemnify and hold SELLER harmless from and against any and all such losses,
damages, delays or liabilities.

          At SELLER's Loading Pier or Third-Party Pier, laytime shall commence
[---] NOR is tendered or three hours after BUYER's Nominated Barge is all secure
at pier, whichever [---].  Allowable laytime shall be [---] provided, however,
that in the event that a part cargo or part cargoes belonging to a third party
or third parties is/are loaded onto BUYER's Nominated Barge, allowable laytime
shall be prorated and BUYER's allowable laytime shall be calculated on the basis
of the ratio of the bill of lading volume of BUYER's cargo to the total bill of
lading volume of the entire cargo loaded onto BUYER's Nominated Barge or vessel.
Laytime shall cease when the hoses are disconnected; however, in the event part
cargoes are loaded for BUYER and a third party or parties,  BUYER's laytime
shall commence as provided above if BUYER's cargo is loaded first, or shall
commence upon commencement of loading of BUYER's cargo if BUYER's 

                                       28
<PAGE>
 
cargo is not the first to be loaded, and shall cease upon completion of loading
of BUYER's cargo. Laytime is allotted and calculated using the barge currently
named NOHO HELE (having approximately a 56,000 Bbl capacity). In the event that
BUYER's Nominated Barge is a vessel other than the NOHO HELE, laytime shall be
the capacity of the substitute tank vessel divided by [---] per hour; e.g., a 
[---] barge shall have an allowable laytime of [---].

          Demurrage shall be payable at a rate equal to BUYER's actual cost of
tug and tow per hour for each hour used and prorated for each portion of an hour
used in excess of allowable laytime.  In the event the condition of BUYER's
Nominated Barge renders it incapable of receiving cargo at the minimum Delivery
rate, such that the time spent loading BUYER's Nominated Barge (all cargoes) is
in excess of [---] SELLER shall have the right to suspend loading operations and
order BUYER's Nominated Barge to vacate SELLER's Loading Pier or Third-Party
Pier.  SELLER shall not be liable for demurrage to the extent that allowed
laytime is exceeded due to the condition of BUYER's Nominated Barge or tug, or
is due to events or acts beyond SELLER's reasonable control.

SECTION 7.5: DELIVERY OPERATIONS AT SELLER'S SPM
- ------------------------------------------------

          While it is the intention of the parties that SELLER make Deliveries
of Product on Oahu at SELLER's Loading Pier or Third-Party Pier, subject to
mutual agreement, Deliveries may be made at SELLER's SPM.  In addition to those
provisions of this Article VII not specific to SELLER's Loading Pier or Third-
Party Pier, the following additional provisions will also apply to these SPM
Deliveries.

                                       29
<PAGE>
 
          SELLER agrees to make a reasonable good faith effort to Deliver Fuel
Oil into the BUYER's Nominated Barge at a temperature above [---].  BUYER's
Nominated Barge shall operate in compliance with SELLER's Operations Manual as
approved by the USCG and shall also comply with SELLER's current requirements
for loading at its SPM as amended from time to time.  SELLER may refuse to berth
or load BUYER's Nominated Barge at SELLER's SPM for failure to comply with
SELLER's Operations Manual or requirements as aforesaid  and shall not be liable
for any resulting delays or expenses of BUYER.

          An accepted Delivery Day shall be determined in respect of each SPM
loading pursuant to the provisions of this section.  BUYER shall provide SELLER
a proposed 3-Day delivery window upon no less than seven (7) Days' notice from
the first proposed Delivery Day.  The notice shall also specify the amount of
the Product to be Delivered, subject to a variation of plus or minus ten (10)
percent at BUYER's option.  The Delivery window shall be narrowed to two (2)
Days upon no less than three (3) Days' notice from the first proposed Delivery
Day and shall be narrowed to one (1) Day upon no less than two (2) Days' notice
from the first proposed Delivery Day.  A final twenty four (24) hour accepted
Delivery Day will be set by mutual agreement upon receipt of the two (2) Day
notice.  SELLER may reject the final proposed Delivery Day upon providing BUYER
twenty four (24) hours notice, with an alternate Delivery Day being set within
one (1) Day of BUYER's proposed Delivery Day.  Notices may be given by
electronic mail, facsimile, radio or telephone.

          When BUYER's Nominated Barge is ready to load, the master of the
barge's tug shall provide SELLER NOR, and laytime shall commence [---] or upon
the barge's arrival in berth (all fast), whichever first occurs.  SELLER shall
be

                                       30
<PAGE>
 
allowed twenty four (24) hours laytime for loading the entire cargo requested in
the 7-Days' notice.

          BUYER's Nominated Barge shall vacate the SPM as soon as loading is
completed.  BUYER shall be responsible for any actual loss or damage incurred by
SELLER as a direct result of the failure of BUYER's Nominated Barge to promptly
vacate the SPM except if such delay is caused by any event or acts beyond the
reasonable control of BUYER, including but not limited to acts of God, fire,
governmental acts or labor disturbances.  In no event shall either party be
responsible for prospective profits, or consequential damages allegedly caused
by or based upon failure of BUYER's Nominated Barge to promptly vacate the SPM.

SECTION 7.6: POLLUTION MITIGATION
- ---------------------------------

          When an escape or discharge of oil or any polluting substance occurs
in connection with or is caused by BUYER's Nominated Barge or its tow, or occurs
from or is caused by loading operations, BUYER or its agents shall promptly take
whatever measures are necessary or reasonable to prevent or mitigate
environmental damage, without regard to whether or not said escape or discharge
was caused by the gross negligence or willful misconduct of BUYER's Nominated
Barge or SELLER or BUYER or others.  Failing such action by BUYER or its agents,
SELLER, on BUYER's behalf, may promptly take whatever measures are reasonably
necessary to prevent or mitigate pollution damage and notify BUYER as soon as
practicable thereafter of such actions.  Each party shall keep the other advised
of the nature and results of the measures taken, and if time permits, the nature
of the measures intended to be taken.

          The cost of all such measures taken shall be borne by BUYER except to
the extent such escape or discharge was caused or contributed to by SELLER, and
prompt reimbursement shall

                                       31
<PAGE>
 
be made as appropriate; provided, however, that should BUYER or its agents give
notice to SELLER to discontinue said measures (and to the extent government
authorities allow SELLER to discontinue said measures) the continuance of
SELLER's actions will no longer be deemed to have been taken pursuant to the
provisions of this clause.

          Each party shall provide notice to the other pursuant to Section 15.2
or as otherwise  provided in writing from time to time during the term of this
Contract.

          Notwithstanding any other provision in this Contract, the foregoing
provisions shall be applicable only between BUYER and SELLER and shall not
affect, as between BUYER and SELLER, any liability of BUYER to any third
parties, including the State of Hawaii and the U.S. Government, if BUYER shall
have such liability.

SECTION 7.7: OIL SPILL LIABILITY AND INSURANCE
- ----------------------------------------------

          Should [---] of the Hawaii Revised Statutes as a result of [---]

          BUYER warrants that any vessel used to load Product purchased from
SELLER shall have in place Primary and Excess Full Form Protection and Indemnity
insurance including cover for Oil Pollution Clean-Up Liability and Liability for
Oil Pollution Damage with a combined policy limit of $700,000,000, or the
maximum available, as reflected by the coverage carried by other vessels calling
at SELLER's SPM.

                                       32
<PAGE>
 
                                 ARTICLE VIII

                       MEASUREMENT, SAMPLING AND TESTING
                       ---------------------------------

SECTION 8.1: INDEPENDENT INSPECTION
- -----------------------------------

          All samples, measurements and determinations samples shall be drawn,
taken and made, respectively, with respect to every Delivery and any other
provision of this Contract shall be under the supervision of the Independent
Inspector, who shall attend every Product Delivery. Reasonable charges for
services rendered by the Independent Inspector shall be borne equally by BUYER
and SELLER.

SECTION 8.2: DETERMINATION OF QUANTITY
- --------------------------------------

          Quantity determination of Product Delivered to BUYER on Oahu will be
made by the Independent Inspector gauging SELLER's Product issuing tanks before
and after Delivery.

          Quantity determination of Diesel Delivered to BUYER at BUYER's
Nominated Marine Terminal at Kahului, Maui or Kawaihae or Hilo, Hawaii, shall be
determined at the time of each Delivery by gauging the receiving tanks at
BUYER's Nominated Marine Terminal before and after pumping.

          Quantities of Diesel and Fuel Oil sold and Delivered by SELLER and
purchased and received by BUYER hereunder shall be determined in accordance with
applicable API, ASTM and IP guidelines and shall be expressed in G.S.V., U.S.
barrels @ 60 degrees Fahrenheit and U.S. gallons @ 60 degrees Fahrenheit for
Diesel and shall be expressed in G.S.V., U.S. barrels @ 60 degrees Fahrenheit
for Fuel Oil.

          The Independent Inspector shall (1) prepare and sign a Certificate of
Quantity stating the quantity of Product determined according to the provisions
of this Section 8.2 to have been

                                       33
<PAGE>
 
Delivered to BUYER and loaded onboard BUYER's Nominated Barge or received by
BUYER's Nominated Marine Terminal; (2) furnish BUYER and SELLER each with a copy
of such Certificate; and (3) advise by facsimile or electronic mail the quantity
of Product Delivered to BUYER loaded onto BUYER's Nominated Barge or received by
BUYER's Nominated Marine Terminal to BUYER and SELLER.  The data in the
Independent Inspector's Certificate of Quantity prepared as provided herein
shall, absent fraud or errors and omissions, be binding and conclusive upon both
parties, and shall be used for verification of the invoice and Bill of Lading.

SECTION 8.3: SAMPLING AND DETERMINATION OF QUALITY
- --------------------------------------------------

          The Independent Inspector shall inspect the receiving barge cargo
tanks immediately prior to the commencement of the Delivery to ensure that they
contain no more than reasonable minimum retains of the previous cargo and shall
draw composite samples of any diesel and fuel oil retain ("Barge O.B.Q.
Samples") if such retain is accessible to standard sampling equipment. The Barge
O.B.Q. Samples shall be sealed and held by the Independent Inspector for a
period of not less than three (3) Months.

          Unless otherwise specifically agreed by the parties, the quality and
BTU Content of the Diesel and Fuel Oil sold and Delivered by SELLER and
purchased and received by BUYER into BUYER's Nominated Barge shall be determined
on the basis of a volumetric weighted average composite of samples drawn from
the cargo tanks at the completion of loading of the Diesel and of the Fuel Oil
into BUYER's barge ("Barge Composite After Loading Samples") by the Independent
Inspector in such a manner as to be representative of the total volume of the
Delivery of each respective Product.

                                       34
<PAGE>
 
          With respect to Diesel Delivered to BUYER's Nominated Marine Terminal,
the Independent Inspector shall draw composite sample(s) representative of the
diesel in the receiving tank(s) at BUYER's Nominated Marine Terminal immediately
prior to the commencement of the Delivery ("Terminal Before Receipt Samples").
The Terminal Before Receipt Samples shall be sealed and retained by the
Independent Inspector for a period of not less than three (3) Months.

          Unless otherwise specifically agreed by the parties, the quality and
BTU Content of the Diesel sold and Delivered by SELLER and purchased and
received by BUYER into BUYER's Nominated Marine Terminal shall be determined on
the basis of a volumetric weighted average composite of samples drawn from the
relevant cargo tank(s) of SELLER's Nominated Barge ("BHP's Barge Sample") or
from the issuing tank(s) of SELLER's Nominated Terminal  ("BHP's Terminal
Sample") by the Independent Inspector in such a manner as to be representative
of the total volume of the Delivery.

          Barge Composite After Loading Samples, BHP's Barge Sample or BHP's
Terminal Sample shall be divided into three parts and dated, and are to be
distributed as follows:

            1. One part shall be provided to SELLER's laboratory for analysis to
               determine quality and BTU Content.

            2. One part shall be provided to BUYER's laboratory for the purpose
               of verifying SELLER's determinations.

            3. One part shall be sealed and retained by the Independent
               Inspector for a period of not less than three (3) Months.

                                       35
<PAGE>
 
          To provide an early warning of any quality problems with Diesel or
Fuel Oil Delivered to BUYER, SELLER agrees to perform a Product Preliminary
Analysis on a  volumetric weighted average composite of samples from 1) SELLER's
issuing tank(s) and delivery piping so as to be approximately representative of
the intended Delivery in the case of a Delivery to BUYER's Nominated Barge; or
2) the cargo tanks of SELLER's Nominated Barge approximately representative of
the intended Delivery; or 3) the issuing tank(s) of SELLER's Nominated Terminal
approximately representative of the intended Delivery. SELLER agrees to provide
BUYER and the Independent Inspector with copies of said Product Preliminary
Analysis prior to commencing Delivery.  The Independent Inspector shall ensure
that copies of the Product Preliminary Analyses are placed on the barge or
otherwise made available to representatives of the terminal facility receiving
the Product.

          SELLER agrees to provide BUYER and the Independent Inspector with the
Certificate of Quality representing the sample(s) drawn by the Independent
Inspector and will make a reasonable good faith effort to provide the
Certificate of Quality no later than twenty four (24) hours after the Delivery
has been completed. If the completed Certificate of Quality can not be provided
to the Independent Inspector and BUYER within said 24-hour period, in lieu
thereof, SELLER agrees to provide to the Independent Inspector and BUYER, no
later than 24 hours after the Delivery has been completed, the final
determination of API gravity, flash point, sulfur content and sediment & water
which shall be reported in the completed Certificate of Quality. BUYER shall
have the right to perform laboratory analyses in order to verify the results of
SELLER's laboratory analyses; provided however, that such verification analyses
shall be performed in a timely manner.

                                       36
<PAGE>
 
SECTION 8.4: DISPUTE
- --------------------

          If SELLER or BUYER has reason to believe that the quality or quantity
of Product stated in a Certificate of Quality, Certificate of Quantity, Product
Preliminary Analysis, report of the Independent Inspector and any other document
relevant to the determination of the quantity or quality of the Diesel and Fuel
Oil Delivered to BUYER, regardless of whether or not such document was prepared
by the Independent Inspector, is incorrect, including a dispute as to the
Product Preliminary Analysis and test results of the Barge O.B.Q. Samples, Barge
Composite After Loading Samples, Terminal Before Receipt Samples, BHP's Barge
Samples or BHP's Terminal Samples in the possession of SELLER or BUYER, or any
other relevant samples, then that party shall within thirty (30) Days after the
later of the date of the complete Certificate of Quality or the date of the
final determination of BTU Content, present the other party with documents
supporting such determination.   The parties will thereafter confer, in good
faith, on the causes for the discrepancy and shall proceed to correct such
causes and adjust the quality and quantity, if justified, for the Delivery in
question.

          In the event of an unresolvable difference between SELLER and BUYER,
the Independent Inspector shall prepare in whole or in part from the samples in
its possession, a representative sample of the disputed Delivery ("Referee
Sample") which shall be provided to an independent laboratory for a final
determination, which shall be binding on the parties.  The Referee Sample shall
include a volumetric proportion of the Barge O.B.Q. Sample, or in lieu thereof,
the Barge Composite After Loading Sample from the previous cargo of BUYER's
Nominated Barge, should the retains of the previous cargo of BUYER's Nominated
Barge be

                                       37
<PAGE>
 
reasonably suspected as a cause of the quality problem. SELLER and BUYER shall
share equally the cost for such independent laboratory determination.

          In the event of any quality problems occurring, both SELLER and BUYER
shall attempt to minimize the impact of any such quality problems by quality
specification waiver, especially if use of the Delivered Diesel or Fuel Oil will
not harm BUYER, or by SELLER Delivering higher quality Diesel or Fuel Oil in a
timely manner to produce a specification quality blend at BUYER's Nominated
Barge or Product storage terminal. If efforts to resolve the quality problem
fail, BUYER may return off-specification Delivered Product to SELLER, in which
case SELLER shall replace the off-specification Product by Delivering an equal
volume of Product to BUYER in a timely manner.

          All costs and expenses, including testing, transportation, re-
refining, and handling costs incurred in returning and replacing off-
specification Product shall be paid by the responsible party, as determined by
the independent laboratory test results and any other applicable evidence.  In
no event shall either party be responsible for prospective profits, or
consequential damages allegedly caused by or based upon any quality problem with
the Product.

                                  ARTICLE IX

                                     [---]

          It is understood and agreed that both parties entered into this
Contract [---] of this Contract or any subsequent amendments hereto, [---]

                                       38
<PAGE>
 
is [---] by [---] or [---] by [---] hereunder. [---] Such [---] shall be [---]
after such a [---] the parties shall [---] within [---] Days after [---] the 
[---] Such [---] within [---] has been agreed upon, or [---]

                                       39
<PAGE>
 
                                   ARTICLE X

                                 FORCE MAJEURE
                                 -------------

SECTION 10.1: FORCE MAJEURE
- ---------------------------

As used in this Contract, an event or act of "Force Majeure" is defined as
follows: acts of God, wars, riots, strikes, labor disputes, lockouts, blockades,
insurrections, inability to secure materials or labor by reason of allocations
promulgated by governmental agencies, epidemics, landslides, lightning,
earthquakes, fires, floods, tidal waves, volcanic eruptions, explosions, or any
other causes not within the reasonable control of the affected party.

SECTION 10.2: OBLIGATIONS SUSPENDED
- -----------------------------------

          BUYER's obligation to purchase or receive Product, or SELLER's
obligation to sell or Deliver Product, shall be suspended to the extent
performance is prevented by an event or act of Force Majeure for any period in
which such event or act exists as to the party claiming Force Majeure; and so
long as such party is exercising its good faith efforts to overcome such Force
Majeure event. However, nothing in this Article X excuses BUYER from its
obligation to make payments of money due SELLER for Product already Delivered to
BUYER.

SECTION 10.3: NOTICE OF FORCE MAJEURE
- -------------------------------------

          The party claiming Force Majeure agrees to give the other party prompt
written notice of an act or event of Force Majeure.  The party claiming Force
Majeure shall use due diligence to cure any act or event of Force Majeure, and
shall give the other party prompt notice after the act or event of Force Majeure
has terminated.  This Article shall not require any party to settle or
compromise any strike or labor dispute.

                                       40
<PAGE>
 
SECTION 10.4: NO MAKE-UP REQUIREMENT
- ------------------------------------

          After the act or event of Force Majeure has terminated, SELLER shall
not be obligated to sell and Deliver and BUYER shall not be obligated to
purchase and receive the un-Delivered quantity of Product which normally would
have been sold and Delivered during the period of Force Majeure.

                                  ARTICLE XI
                         PRICE AND ALLOCATION CONTROLS
                         -----------------------------

SECTION 11.1: REGULATORY PRICE SUSPENSION
- -----------------------------------------

          If SELLER is precluded by statute, or by regulation, rule,
governmental interpretation or order implementing such statute from obtaining
any increase in price of Product, as determined pursuant to this Contract, the
increase shall be suspended until said law, regulation, rule, governmental
interpretation or order permits the increase in whole or in part. In such an
event, BUYER and SELLER shall confer in good faith and attempt to agree on an
alternate course of action; but failing agreement within ten (10) Days, the
party adversely affected may suspend performance with respect to the quantity of
Product affected by the statute, regulation, rule, governmental interpretation
or order.  In the event the law, regulation, rule, governmental interpretation
or order is terminated or is later modified to permit the increase, in whole or
in part, the Product Price shall be increased for Deliveries of the Product made
thereafter to the level permitted under this Contract without further action by
the parties.

                                       41
<PAGE>
 
SECTION 11.2: GOVERNMENT REGULATIONS
- ------------------------------------

          If the Delivery or supply of Product pursuant to this Contract
conflicts with or is limited or prohibited by any federal, state or local
regulations, statutes, rules or permits then to the extent of such conflict,
limitation or prohibition, SELLER shall have no obligation to Deliver or supply
BUYER with the Product under this Contract and BUYER shall have no obligation to
purchase or receive the Product under this Contract.  BUYER, in BUYER's
discretion, may elect to complete and file any and all required Federal or state
regulatory forms to permit, facilitate, or enable the supply of Product to BUYER
under this Contract.  SELLER shall fully cooperate with BUYER in the completion
and filing of the foregoing forms.  If BUYER's purchase, receipt or use of
Product pursuant to this Contract conflicts with or is limited or prohibited by
any Federal, State, or local regulations, statutes, rules or permits then to the
extent of such conflict, limitation, or prohibition, BUYER shall have no
obligation to purchase and receive the Product under this Contract.


                                  ARTICLE XII

                                  ASSIGNMENT
                                  ----------

          This Contract shall not be assigned by either party without prior
written consent of the other party, which shall not be unreasonably withheld;
provided, however, HECO, HELCO, and MECO may assign their interests in this
Contract to the Trustee under their respective First Mortgage Indentures.

                                       42
<PAGE>
 
                                  ARTICLE XIII

                                 APPLICABLE LAW
                                 --------------

          This Contract shall be deemed to be a Contract made under and shall be
governed by and construed in accordance with the laws of the State of Hawaii.
The parties hereby consent to the personal jurisdiction of the federal and state
courts in the State of Hawaii.

                                  ARTICLE XIV

                      PUBLIC UTILITIES COMMISSION APPROVAL
                      ------------------------------------

          This Contract is required to be filed with the Hawaii Public Utilities
Commission ("PUC") for approval.  If in proceedings initiated as a result of the
filing of this Contract, the PUC disapproves or fails to authorize the full
recovery of fuel costs incurred under this Contract through the a respective
BUYER's Energy Cost Adjustment Clause, the affected BUYER may terminate this
Contract at any time within ninety (90) Days of disapproval by giving sixty (60)
Days written notice to the SELLER.

                                   ARTICLE XV

                    ENTIRE AGREEMENT, WAIVER AND ILLEGALITY
                    ---------------------------------------

SECTION 15.1: ENTIRE AGREEMENT AND WAIVER
- -----------------------------------------

          This Contract incorporates the entire agreement between the parties
with reference to the subject matter and cancels and supersedes as of the date
of execution hereof all prior oral or written understandings, or agreements,
between the parties with respect to the subject matter and may only be modified
by written instrument executed by duly authorized representatives of the

                                      43
<PAGE>
 
parties.  There are no other agreements which constitute any part of the
consideration for, or any condition to, either party's compliance with its
obligations under this Contract.  Failure to insist upon strict performance of
any provision shall not constitute a waiver of the right to require such
performance, nor shall a waiver in one case constitute a waiver with respect to
a later breach, whether of a similar nature or otherwise.  If any term or
provision of this Contract is held by any Court to be illegal or unenforceable,
the remaining terms, provisions, rights and obligations shall not be affected.
The headings or captions are for  convenience  only  and  have  no  force  or
effect  on legal meaning in the construction or enforcement of the Contract.
Time shall be of the essence in this Contract.

SECTION 15.2: NOTICES
- ---------------------

          Except as otherwise expressly provided herein, all notices shall be
given in writing, by letter, electronic mail, or facsimile to the following
addresses, or such other addresses as the parties may designate by notice, and
shall be deemed given upon receipt.

          SELLER:   BHP PETROLEUM AMERICAS REFINING INC.
                    733 BISHOP STREET
                    HONOLULU, HAWAII  96813
                    ATTN: VICE PRESIDENT INTERNATIONAL SUPPLY AND MARKETING
                    FACSIMILE:  (808) 547-3796

          BUYER:    HAWAIIAN ELECTRIC COMPANY, INC.
                    P. O. BOX 2750
                    HONOLULU, HAWAII  96840
                    ATTN:  MANAGER, POWER SUPPLY SERVICES DEPARTMENT
                    FACSIMILE:  (808) 543-4366

The Manager, Power Supply Services Department, for Hawaiian Electric Company,
Inc. shall be responsible for forwarding notices to the other parties to this
Contract.

                                      44
<PAGE>
 
                                  ARTICLE XVI

                                     [---]

          During the period this Contract is in effect, [---] agrees to make
available to [---] on a [---]  Such use shall include an allowance for [---] its
fuel storage and distribution facilities and pipelines located at Barbers Point
in Campbell Estate Industrial Park. [---] shall be on the basis of the terms,
conditions and obligations set forth in this Contract and Addendum No. 1
attached hereto and incorporated herein by reference.

          [---] as set forth in this Article XVI and Addendum No. 1 during any
Year of this Contract shall be [---] per Article III of this Contract,
respectively, during the preceding Year for the Years of this Contract during
the period 1999-2004; for Contract Year 1998, the [---]

                                  ARTICLE XVII

             BUYER'S USE OF SELLER'S FACILITIES ON MAUI AND HAWAII
             -----------------------------------------------------

          SELLER agrees to provide the respective BUYER on a space-available
basis the non-exclusive right to use SELLER's Kahului Terminal and to provide
BUYER [---] to use SELLER's Hilo Terminal.  The respective BUYER's use of

                                      45
<PAGE>
 
SELLER's Neighbor Island Terminals shall be on the basis of the terms,
conditions and obligations set forth in Addendum No. 2 attached hereto and
incorporated herein by reference.

                                 ARTICLE XVIII

                                   INDEMNITY
                                   ---------

          SELLER shall indemnify, defend and hold harmless BUYER, its directors,
officers, employees and agents (including but not limited to affiliates and
contractors and their employees) from and against all liabilities, damages,
losses, penalties, claims, demands, suits, costs, expenses, (including
attorneys' fees) and proceedings of any nature whatsoever for bodily injury,
(including death) or property damage, including but not limited to BUYER's
facilities, that results from Diesel or Fuel Oil which does not meet
specifications or contaminated Diesel or Fuel Oil or that arises out of or is in
any manner connected with the storage or transportation of Diesel or Fuel Oil in
SELLER's custody, except to the extent that such injury or damage may be
attributable to the gross negligence or willful action of BUYER.

          BUYER shall indemnify, defend and hold harmless SELLER, its directors,
officers, employees and agents (including but not limited to affiliates and
contractors and their employees) from and against all liabilities, damages,
losses, penalties, claims, demands, suits, costs, expenses, (including
attorneys' fees) and proceedings of any nature whatsoever for bodily injury,
(including death) or property damage, including but not limited to SELLER's
facilities, that results from Diesel or Fuel Oil which does not meet
specifications or contaminated Diesel or Fuel Oil or that arises out of or is in
any manner connected with the storage or transportation of

                                      46
<PAGE>
 
Diesel or Fuel Oil in BUYER's custody, except to the extent that such injury or
damage may be attributable to the gross negligence or willful action of SELLER.
               Notwithstanding the foregoing, neither party shall be responsible
for consequential damages.
          The provisions of this Article XVIII shall survive the termination of
the Contract.

                                  ARTICLE XIX

                                    DEFAULT
                                    -------
          Failure of either party to promptly perform any material obligation
under this Contract shall constitute default.  If BUYER or SELLER considers the
other party (the "Defaulting Party") to be in default of any material obligation
under this Contract, such party (the "Non-Defaulting Party") shall give the
Defaulting Party prompt notice thereof, describing the particulars of such
default.  The Defaulting Party shall thereafter have thirty (30) Days from the
receipt of said notice in which to remedy such default.  If the default is not
cured, the Non-Defaulting Party may, without prejudice to any other rights or
remedy of such party in respect of such default, terminate its obligations under
this Contract by written notice to the Defaulting Party, except for BUYER's
obligation to pay in full in United States currency for amounts due under this
Contract and except for any obligation which may accrue to BUYER or SELLER under
Article XVIII herein.  Any termination shall be without prejudice to accrued
rights.  All rights and remedies hereunder are independent of each other and
election of one remedy shall not exclude another.

                                      47
<PAGE>
 
                                   ARTICLE XX

                                  COUNTERPARTS
                                  ------------

          This Contract may be executed in as many counterparts as desired by
the parties, any one of which shall have the force and effect of any original
but all of which together shall constitute the same instrument.

                                      48
<PAGE>
 
          IN WITNESS WHEREOF, the parties hereto, intending to be legally bound
thereby, have caused this Contract to be executed in duplicate originals by
their duly authorized officers.

HAWAIIAN ELECTRIC                               BHP PETROLEUM AMERICAS
COMPANY, INC.                                   REFINING INC.


By        /s/ Edward Y. Hirata                  By /s/ Faye W. Kurren
          --------------------                     ------------------
          Its                                      Its
                                                          SELLER


By        /s/ Marvin A. Hawthorne
          -----------------------
          Its
                    BUYER

HAWAII ELECTRIC LIGHT
COMPANY, INC.


By        /s/ Edward Y. Hirata
          --------------------
          Its


By        /s/ Marvin A. Hawthorne
          -----------------------
          Its

                     BUYER

MAUI ELECTRIC COMPANY, LTD.


By        /s/ Edward Y. Hirata
          --------------------
          Its


By        /s/ Marvin A. Hawthorne
          -----------------------
          Its

                      BUYER

                                      49
<PAGE>
 
                                 ADDENDUM NO. 1

                                     [---]

SECTION 1: INTRODUCTION
- -----------------------

          During the term of this Contract, [---] agrees to make available for
the use of [---] on a non-exclusive basis for [---] and for the [---] provided:

1. [---] shall have the right to review the quality of [---] being transported
   by [---] through [---] and

2. [---] shall permit [---] its employees and agents (including but not limited
   to affiliates and contractors and their employees) to enter upon and inspect
   [---] immediately prior to, during and immediately after shipment of [---]
   through [---] upon reasonable advance notice to [---] and provided that such
   entry and inspection shall not interfere with operation of [---]

3. During any period of use by [---] shall be operated in a safe manner, in
   compliance with all applicable laws and regulations, and in accordance with
   GEOPS and in accordance with generally accepted industry practices.

                                       1
<PAGE>
 
SECTION 2: [---]
- -----------     

          [---] need to be constructed in the location where [---] physically
intersect and connect with [---] which shall be taken to be at the [---]
Provided further:

a. At the request of [---] shall be responsible for the design, engineering and
   construction of the [---] shall bear all reasonable costs arising from said
   design, engineering and construction of the [---] shall have the right to
   approve in advance, [---] designs, engineering and construction standards,
   provided, however, that such approval shall not be unreasonably withheld.

b. [---] may, at its option, engage third-party consultants or contractors to
   perform the design, engineering and construction of the [---] provided that 
   [---] selection of such consultants and contractors shall be subject to [---]
   approval, provided, however, that such approval shall not be unreasonably
   withheld.

c. The design and engineering plans (the "Plans") for the [---] shall be
   developed in accordance with all applicable laws and regulations and GEOPS. 
   [---] shall have thirty (30) working days following its receipt of the Plans
   ("30-day Period") to review the Plans and submit written comments to [---].
   Should [---] fail to provide written notice to [---] of its approval,
   conditional approval or disapproval of the Plans prior to the end of said 30-
   day Period, [---] shall be deemed to have approved the Plans.

d. [---] shall permit [---] to inspect the construction of the [---] at all
   times during normal business hours and upon reasonable advance notice. [---]
   or

                                       2
<PAGE>
 
   [---] contractor shall perform all construction work in compliance with all
   applicable laws and regulations. [---] shall submit a construction time
   schedule for approval by [---] provided, however, that such approval shall
   not be unreasonably withheld.

e. Following the completion of the construction of the [---] shall transfer to 
   [---] all of [---] rights, title and interest in and to the [---] which shall
   then be a part of [---]. On and after such date and time of transfer, [---]
   shall own, operate and maintain the [---] and other components of the [---
   ]shall schedule and perform such routine maintenance on the [---] as shall be
   required by applicable laws, regulations, general industry practices and
   GEOPS, providing reasonable advance notice to [---] shall reimburse [---] for
   its reasonable documented out of pocket costs and expenses to the extent they
   result from such routine maintenance.

SECTION 3: SAFE OPERATION
- -------------------------

          During any period of use by [---] shall at all times be operated in a
safe, effective and efficient manner, in compliance with all applicable laws and
regulations, in a reasonable and prudent manner and in conformance with
generally accepted industry practices and GEOPS. [---] shall be required to
provide and pay all costs for necessary documentation, including operations
manuals, personnel and equipment (hoses, valves, containment booms, etc.) to
safely operate [---] except to the extent said costs result from [---] use, in
which case said costs are for the account of [---]. During any period of use by
[---] shall at all times be operated within the operating procedures, pressure
testing requirements, emergency stop procedures, etc. established

                                       3
<PAGE>
 
by the [---] in accordance with GEOPS.  These procedures and requirements may be
changed from time to time upon reasonable advance notice to [---].

          [---] operating standards and instructions shall be available for 
[---] inspection at [---].

SECTION 4: MAINTENANCE
- ----------------------

          Consent of [---] shall not be required for routine maintenance of the
[---] or [---] provided, however, [---] shall be required to advise [---] in
advance regarding the potential impact on shipments of [---] caused by any
annual USCG required hydrotesting or maintenance procedures or improvements
which are not routine or minor in nature and which are not urgent and necessary
to maintain the [---] or [---] in good order. Such maintenance shall be
performed by [---] as may be required from time to time.

          [---] shall maintain accurate and complete records of maintenance
performed and shall provide same and any other relevant supporting information
as [---] may reasonably require.

SECTION 5: ADDITIONS OR MODIFICATIONS
- -------------------------------------

          If subsequent to January 1, 1998, additions or modifications to any
part of [---] are reasonably required in the mutual opinion of [---] solely in
order to accommodate [---] use, such modifications shall be designed, engineered
and constructed in accordance with the provisions of Section 2 herein.  All
rights, title and interest in the addition or modification shall rest with [---]
who shall own, operate and maintain such addition or modification in accordance
with the provisions herein including but not limited to

                                       4
<PAGE>
 
Sections 2, 3 and 4. [---] shall reimburse [---] for its reasonable costs and
expenses incurred pursuant to the installation and maintenance of the addition
or modification upon presentation of invoices or other suitable documentation in
accordance with Section 2 and Section 11 herein.

SECTION 6: FORECAST, SCHEDULING, NOTICE AND DEMURRAGE
- -----------------------------------------------------

          [---] will mutually coordinate the shipment of [---] through [---]
Shipment scheduling shall be flexible to ensure that [---] shipments are not
unreasonably interrupted.  To assist in the coordination of shipments:

1.  [---] shall provide [---] a forecast of intended shipments, minimum of [---]
    barrels to a maximum of [---] barrels, of [---] through [---] ten (10) Days
    prior to the beginning of any month for the two (2) subsequent months. The
    forecast for the first subsequent month shall define on a weekly basis the
    nature and volume of shipments. The forecast for the second subsequent month
    shall specify the total volume of shipments for that month.

2.  With respect to each individual shipment of [---] though [---] shall provide
    [---] proposed one (1) Day shipment period or window for shipments volumes
    up to [---] barrels, a proposed two (2) Day shipment window for shipment
    volumes from [---] barrels to [---] barrels, and a proposed three (3) Day
    shipment period or window for shipment volumes from [---] barrels to [---]
    barrels upon no less than twelve (12) Days' notice prior to the first Day of
    the proposed shipment period ("12-Day Notice"). The 12-Day Notice shall also
    specify the

                                       5
<PAGE>
 
    amount of [---] to be shipped, subject to a variation of plus or minus
    twenty (20) percent with respect to the actual volume shipped. [---] may
    reject the proposed shipment period upon providing [---] notice, no later
    than two (2) business days from the receipt of [---] 12-Day Notice, of an
    alternate one (1) Day, two (2) Day or three (3) Day shipment period,
    respectively, where the first day of such alternate one (1) Day, two (2) Day
    or three (3) Day period is within three (3) Days of the date of [---] first
    proposed one (1) Day, two (2) Day or three (3) Day shipment period,
    respectively. Notices may be given by electronic mail, facsimile or
    telephone.

3.  Notwithstanding the estimated duration of shipment operations, the estimated
    date and time of the commencement of shipment operations shall be narrowed
    to 12 hours by mutual consent of [---] no later than two (2) Days prior to
    the estimated shipment commencement time and date. [---] shall be
    responsible to reserve the pier, on the agreed upon dates, through the
    customary channel in the State of Hawaii Department of Transportation -
    Harbor's Division. If [---] is unable to reserve the pier during the agreed
    upon dates, then [---] shall not be responsible for demurrage until [---]
    reserves the pier in the next agreed upon shipment window.

4.  When [---] is ready to load or discharge and is within the shipment window
    as per this Section 6, [---] shall provide [---]. Laytime shall commence 
    [---] whichever shall first occur. If [---] tenders NOR before the first day
    of the agreed shipment period the NOR shall be effective

                                       6
<PAGE>
 
    [---] Allowable laytime shall be equal to the total volume of the shipment
    in barrels, as determined by the Independent Inspector from gauging the
    receiving or issuing tank(s) in [---] divided by [---] barrels per hour.
    Laytime shall cease when the hoses are disconnected. Demurrage shall be
    payable at a rate equal to [---] actual invoiced demurrage cost for each
    hour used and prorated for each portion of an hour used in excess of
    allowable laytime. [---] shall not be liable for demurrage to the extent
    that allowed laytime is exceeded due to the condition of [---] or is due to
    any events or acts beyond the reasonable control of [---] including but not
    limited to acts of God, fire, weather, government acts, labor disturbances
    or other events as defined in Article X.

5.  [---] shall vacate the berth at [---] upon completion of cargo operations.
    If the condition of [---] renders it incapable of receiving or discharging
    cargo at a minimum rate of [---] barrels per hour such that the time spent
    loading or discharging[---] is in excess of the total of allowable laytime,
    [---] at its sole option, may require [---] to promptly vacate the berth at
    [---] to accommodate [---] operations. In circumstances where the re-
    berthing of [---] is required to complete cargo operations, [---] shall make
    reasonable efforts to [---] promptly upon completion of [---] operations and
    all time waiting for re-berthing shall be for [---] account. [---] shall be
    responsible for any actual loss or damage incurred by [---] as a direct
    result of the failure of [---]

                                       7
<PAGE>
 
    to promptly vacate the berth except if such delay is caused by any event or
    acts beyond the reasonable control of [---], including, but not limited, to
    acts of God, fire, governmental acts or labor disturbances. In no event
    shall either party be responsible for loss of prospective profits, or
    consequential damages allegedly caused by or based upon failure of [---] to
    promptly vacate the berth.

SECTION 7: DETERMINATION OF SHIPMENT QUANTITY
- ---------------------------------------------

          The quantity of each shipment of  [---] shall be determined by an
Independent Inspector in accordance with Article VIII.  The Independent
Inspector or [---] shall provide [---] with summary documentation of [---]
shipments describing the volumes and dates of such shipments through [---].

SECTION 8: TITLE AND RISK OF LOSS
- ---------------------------------

          Title to [---] transported through [---] for [---] account shall at
all times remain with [---] shall bear the risk of loss of [---] transported in
[---] except to the extent the loss was caused or contributed to by the gross
negligence or willful misconduct of [---].

SECTION 9: LINE DISPLACEMENTS
- -----------------------------

          If for operational reasons it is necessary for [---] to deliver line
displacement stock to [---], such line displacement stock shall be the least
expensive grade or type available which is suitable for the purpose and the line
displacement stock shall be of such quality specification that neither causes
operational problems to [---] nor results in the contamination of [---] such
that [---] fail to comply with the specification limits with which they would
have otherwise been in compliance. If time permits,

                                       8
<PAGE>
 
[---] shall have the right to approve in advance the suitability of such
pipeline displacement stock, provided that such approval shall not be
unreasonably withheld. [---] shall purchase such stock from [---] in accordance
with the prices set forth in Article V.  The quantity of line displacement stock
delivered to [---] shall be determined by the Independent Inspector in
accordance with Article VIII.

          To the extent that small portions of [---] shipped through [---] are
delivered to [---] in the course of acting as an interface between [---] in that
portion of [---] not used to ship [---] shall credit [---] for such transferred
[---] at the prices set forth in Article V. The quantity of such transferred 
[---] shall be determined by the Independent Inspector in accordance with
Article VIII.

SECTION 10: THROUGHPUT FEES AND OTHER EXPENSES
- -----------------------------------------------

          In consideration for its use of [---] and for performing line
displacement operations for    [---] both before and after [---] use of [---]
shall pay to [---] a throughput charge ("Throughput") on [---] transferred
through [---].

          The Throughput shall be calculated by multiplying the transport charge
per physical barrel ("Rate") by the number of physical barrels of [---] shipped
through [---] as determined by the Independent Inspector. The number of physical
barrels of [---] shipped shall be determined pursuant to Article VIII.

                                       9
<PAGE>
 
          The base Rate shall be [---] per barrel. [---] Escalation factor A
("FA"), escalation factor B ("FB") and escalation factor C ("FC") are defined as
follows:

   (i)         A labor adjustment factor A which is defined as the arithmetic
               average of the hourly earnings in dollars per hour for the
               petroleum and coal products industry as shown in the "Employment
               and Earnings" publication of the U.S. Department of Labor, Bureau
               of Labor Statistics, for the three months of the second calendar
               quarter immediately preceding the calendar quarter of the month
               in which services are rendered, divided by 20.353.

   (ii)        An industrial commodities adjustment factor B which is defined as
               the arithmetic average of the Producer Price Index for Industrial
               Commodities as  published by the U.S. Department of Labor, Bureau
               of Labor Statistics, for the three months of the second calendar
               quarter immediately preceding the calendar quarter of the month
               in which services are rendered, divided by 128.700.
         
   (iii)       A fuels and power adjustment factor C which is defined as the
               arithmetic average of the Producer Price Index for Fuels and
               Power (Code 5), as  published by the U.S. Department of Labor,
               Bureau of Labor Statistics, for the three months of the second
               calendar quarter immediately preceding the calendar quarter of
               the month in which services are rendered, divided by 90.767.

                                      10
<PAGE>
 
          [---] shall employ and also be responsible for costs of any support
vessels, pilots, mooring masters, [---] or line handlers supplied by [---] or
otherwise required by [---], all of which shall become borrowed servants of 
[---]. Dues and other charges on [---] (whether or not such dues or charges are
based on the quantity of [---] loaded or discharged or on the freight and
without regard from whom such dues or charges are withheld) shall be paid by 
[---]. Any taxes on freight shall be borne by [---] shall be responsible for any
State fee imposed for its use of [---] in the nature of wharfage or pipeline
toll.

SECTION 11: INVOICES
- --------------------

          [---] shall issue invoices for [---] in the month following the month
in which the services or costs and expenses are incurred. [---] will pay on
these invoices in accordance with Article VI.

SECTION 12: [---]
- ------------     
          [---]

                                      11
<PAGE>
 
SECTION 13: OIL SPILL CLEAN UP EXPENSE
- --------------------------------------

          [---] shall expeditiously clean up any spills occurring from a leak,
rupture or other incident to [---] when [---] are in use by [---] to transport
[---] or line displacement; and any costs incurred by [---] for such cleanup
shall be for the account of [---] and invoices for such services will be
rendered by [---] in accordance with Article VI of this Contract; provided that
[---] shall have no obligation to pay for such cleanup to the extent caused by
the gross negligence or willful misconduct of [---], its employees and
contractors.

SECTION 14: CONSEQUENTIAL DAMAGES
- ---------------------------------

In no event shall either party be responsible for loss of prospective profits,
or consequential damages arising or resulting from either party's performance or
failure to perform hereunder.

SECTION 15: VESSEL REQUIREMENTS
- -------------------------------

          [---] shall comply with all applicable provisions of Article VII of
this Contract, including but not limited to compliance with regulations,
compliance with [---] vessel acceptance standards, compliance with [---]
Operations Manual, pollution mitigation, required insurance, liability for dues
and other charges on said vessel. [---] shall be responsible for all reasonable
costs of physical inspection of vessel, as required by [---].

SECTION 16: NOT A PUBLIC UTILITY
- --------------------------------

          Nothing herein shall be construed as a dedication of [---] to public
use and, except as otherwise specifically provided herein, [---] shall retain
the exclusive right to determine who shall use [---].

                                      12
<PAGE>
 
SECTION 17: ASSIGNMENT
- ----------------------

          [---] shall not sell, assign, license, sublet or in any other manner
transfer or dispose of all or any of its right, title, or interest hereunder to
any other person, other than to a subsidiary, affiliate or parent corporation or
the trustee under [---].

SECTION 18: PARTIES' RIGHTS
- ---------------------------

          Neither [---] shall commit or suffer to be committed any act or
default whereby the rights and interests of either party in and under right of
entry or easements shall be jeopardized.

                                      13
<PAGE>
 
                                 ADDENDUM NO. 2

                     SELLER'S FACILITIES ON MAUI AND HAWAII
                     --------------------------------------

SECTION 1: AVAILABILITY, FORECAST, OPTION, THROUGHPUT, QUALITY, DELIVERY SIZE
- -----------------------------------------------------------------------------
AND SERVICES
- ------------

          To provide operating flexibility to a valued customer SELLER agrees to
provide the respective BUYER on [---] to use SELLER's Kahului Terminal and
SELLER's Hilo Terminal for the terminaling of BUYER's diesel received in bulk
ex-barge on the terms and conditions described in this Addendum No. 2.

          Unless expressly agreed to by SELLER and BUYER, [---] SELLER shall
give BUYER a forecast of available diesel storage capacity expected to be
available in each of SELLER's Neighbor Island Terminals for each of the [---] in
said [---]  Upon receipt of SELLER's advice, each respective BUYER shall have 
[---] to either commit to the use of such available space, or decline to
exercise said option.

          BUYER's [---] it to deliver diesel for receipt by SELLER at a
respective SELLER's Neighbor Island Terminal for return to BUYER at that same
respective SELLER's Neighbor Island Terminal at [---] barrels per [---] unless
expressly agreed otherwise by SELLER and BUYER.

          BUYER agrees that all diesel delivered to SELLER's Neighbor Island
Terminals shall meet the specifications as described in Article IV.

          BUYER agrees to schedule its shipments to a respective SELLER's
Neighbor Island Terminal such that they arrive at reasonably regular intervals
and such that each delivery

                                       1
<PAGE>
 
shipment contains a minimum of [---] barrels of diesel to SELLER's Kahului
Terminal or a minimum of [---] barrels of diesel to SELLER's Hilo Terminal,
provided the respective terminal is capable of receiving same.

          BUYER agrees to schedule its trucks lifting Returned diesel at the
respective SELLER's Neighbor Island Terminal such that each load is a minimum of
[---] gallons and amounts delivered are to be lifted no later than [---]

          BUYER agrees that diesel loading operations at the truck loading rack
at SELLER's Kahului Terminal shall [---] unless otherwise mutually agreed.
BUYER agrees that diesel loading operations at the truck loading rack at
SELLER's Hilo Terminal shall [---] Sunday through Saturday, unless otherwise
mutually agreed.

SECTION 2: BUYER'S ADVICE OF SHIPMENT OF RECEIVED DIESEL
- --------------------------------------------------------

          Whenever BUYER delivers a shipment of Received diesel for terminaling
at SELLER's Neighbor Island Terminals,  BUYER shall provide SELLER with
estimated arrival and delivery times of BUYER's Nominated Barge transporting the
Received diesel.  BUYER or BUYER's agent shall provide radio or phone
notification to SELLER's representative at each unloading location at least
twenty four (24) hours prior to the diesel delivery of Received diesel.  In
addition, BUYER or BUYER's agent shall also provide the Captain of the Port with
radio or phone notification at least twenty four (24) hours prior to any
delivery.  Should the estimated time of arrival or delivery change by two (2) or
more hours following the 24 hour arrival report, BUYER or BUYER's agent shall
promptly report the change to SELLER's representative and the Captain of the
Port at the place of planned arrival.


                                       2
<PAGE>
 
SECTION 3: BARGE RECEIVED SAMPLE
- --------------------------------

          The Independent Inspector shall draw a volumetric weighted average
composite of samples ("Barge Received Sample") from BUYER's Nominated Barge
tanks so as to be representative of the entire cargo of Received diesel at the
unloading location.   The samples will be divided into a minimum of two (2)
parts and dated.  One part shall be provided to SELLER to be tested or retained,
at its option.  One part shall be sealed and retained by the Independent
Inspector for a period of not less than three (3) Months.

          This sample as well as the Barge Composite After Loading Sample, Barge
O.B.Q. Sample and relevant samples of diesel cargo from previous barge shipments
shall be available for analysis by SELLER, BUYER or an independent laboratory
should SELLER's subsequent sampling and analysis indicate a quality problem.  To
provide an early warning of any quality problems with the Received diesel, BUYER
agrees to instruct the Independent Inspector to place onboard BUYER's Nominated
Barge transporting the Received diesel or transmit by facsimile to the
respective SELLER's Neighbor Island Terminal, the Product Preliminary Analysis,
tank final Certificate of Quality and other documents in the possession of the
Independent Inspector regarding the quality of the Received diesel which shall
thereby be available to the respective SELLER's Neighbor Island Terminal's
representative upon said barge's arrival.

SECTION 4: CONDITIONAL ACCEPTANCE OF RECEIVED DIESEL
- ----------------------------------------------------

          SELLER shall review the Product Preliminary Analysis, tank final
Certificate of Quality and other documents regarding to the quality of the
Received diesel supplied by BUYER as a basis for conditional quality acceptance.

                                       3
<PAGE>
 
          To facilitate turnaround of BUYER's Nominated Barge, SELLER shall have
the option to promptly perform a diesel Preliminary Analysis on its part of the
Barge Received Sample. .Received diesel will be considered conditionally
acceptable if its API gravity so analyzed is within 0.3 degrees of its gravity
as delivered to BUYER, appearance is bright and clear and if its Flash Point is
above its 150 degree F specification.

          Notwithstanding the above conditional acceptance, SELLER may use the
Barge Received Sample to determine all the qualities described in Article IV for
the Received diesel for deciding whether to accept or reject the receipt of the
Received diesel for which a quality problem is reasonably indicated.

SECTION 5: QUALITY PROBLEM, DISPUTE AND REMEDY REGARDING RECEIVED DIESEL
- ------------------------------------------------------------------------

          If as a result of SELLER's examination of the quality documentation,
or otherwise, a quality problem with the Received diesel is reasonably
indicated, SELLER may at its option and election obtain and analyze a portion of
the Barge Received Sample, Barge Composite After Loading Sample of the Received
diesel, Barge O.B.Q. Sample, if any, or other relevant sample in the possession
of BUYER or the Independent Inspector.  If the Product Preliminary Analysis,
BUYER's supplied laboratory test results representing the Barge Composite After
Loading Sample, diesel Preliminary Analysis or quality determination of other
relevant samples fails conditional acceptance or the results of SELLER's
analyses of relevant samples indicate diesel quality not consistent with the
qualities described in Article IV, SELLER shall promptly notify Buyer. Within
thirty (30) Days after each delivery of Received diesel, SELLER shall give BUYER
notice of any claim of contamination of any applicable samples in the possession
of SELLER and the Independent Inspector which relate to the diesel in question
including diesel in

                                       4
<PAGE>
 
the affected of SELLER's Neighbor Island Terminals which has been commingled
with the Received diesel.

          To avoid or reduce the risk of contaminating the diesel in SELLER's
Neighbor Island Terminal which will be commingled with Received diesel which is
reasonably indicated to have a quality problem, BUYER or SELLER may prevent
delivery or halt a shipment delivery in progress until such time as the quality
problem is resolved.  Should BUYER's Nominated Barge have completed delivery of
the Received diesel after discovery of an indicated quality problem, then both
BUYER and SELLER shall confer in good faith and attempt to minimize the impact
of any quality problems on BUYER and SELLER.

          If BUYER and SELLER agree or the Independent Inspector determines that
the quality of the Received diesel did not meet the qualities described in
Article IV, and the Received diesel has contaminated the affected SELLER's
Neighbor Island Terminal inventories, both BUYER and SELLER shall attempt to
minimize the impact of any quality problem on BUYER by waiver of BUYER's
requirement that Received diesel meet quality specifications especially if
SELLER's use of the diesel will not significantly harm SELLER, or by BUYER or
SELLER delivering higher quality diesel in a timely manner to produce a
specification quality blend at the affected SELLER's Neighbor Island Terminal.
If all such, and similar, efforts fail to resolve the quality problem, then
BUYER will reimburse SELLER for the transportation, handling and re-refining
costs of exchanging BUYER's and SELLER's diesel, with diesel meeting the
qualities described in Article IV to the extent the contamination of the
affected SELLER's Neighbor Island Terminal inventories was not caused or
contributed to by SELLER.  Such reimbursement shall occur within sixty (60) Days
of SELLER's original claim.

                                       5
<PAGE>
 
          All costs and expenses, including, but not limited to, demurrage
incurred by BUYER's or SELLER's Nominated Barge, transportation, and handling
costs incurred in waiting to unload, returning and replacing non-specification
Received diesel and any demurrage, transportation, re-refining and handling
costs incurred by SELLER in returning and replacing its contaminated diesel
shall be borne by the respective BUYER, provided that the respective BUYER
confirms the quality problem indicated by SELLER.

          If BUYER disputes SELLER's claim of quality problems with the Received
diesel, objects to SELLER's refusal to accept some or all of the Received diesel
in question into the affected of SELLER's Neighbor Island Terminals on the basis
of SELLER's examination of the relevant quality documentation or as a result of
SELLER's laboratory analyses of the Barge Tank Sample, Barge O.B.Q. Sample and
any other relevant samples, or in the event that any claim made by SELLER
related to the quality of Received diesel is not resolved within thirty (30)
Days of the original claim, the Barge Received Sample and any other relevant
samples in the possession of SELLER, BUYER or the Independent Inspector shall be
submitted to a mutually agreed upon independent laboratory for testing and
analysis, whose determination shall be final and binding on both parties.  In
the event BUYER is found to be correct, SELLER shall pay the cost of such
independent inspection.  In the event SELLER is found to be correct, BUYER shall
pay the cost of such independent inspection.

          SELLER shall have the responsibility for all costs and expenses,
including, but not limited to demurrage incurred by BUYER's or SELLER's
Nominated Barge, transportation, and handling costs incurred in waiting to
unload, returning and replacing non-specification Received diesel and any
demurrage, transportation, re-refining and handling costs incurred by SELLER in

                                       6
<PAGE>
 
returning and replacing its contaminated diesel if it is determined that the
qualities described in Article IV of this Contract are met by the Received
diesel in question.

          However, in no event shall either party be responsible for any
indirect, consequential, special or incidental damages of any kind whether based
in contract, tort (including without limitation negligence or strict liability),
warranty or otherwise allegedly caused by or based upon the quality of the non-
specification Received diesel.

SECTION 6: COAST GUARD DOCK WATCH REQUIREMENTS
- ----------------------------------------------

          The respective BUYER shall be responsible for meeting all USCG dock
watch requirements at Hilo, Hawaii and Kahului, Maui.  Charges levied by any
governmental agency for the respective use of SELLER's Neighbor Island Terminals
including but not limited to the State of Hawaii's wharf and pipeline fees,
shall be for the respective BUYER's account.

SECTION 7: CUSTODY OF RECEIVED DIESEL AND COMMINGLED PRODUCT
- ------------------------------------------------------------

          SELLER will take care, accept custody and control of Received diesel
having conditionally acceptable quality at the flange connecting SELLER's
independently owned facility pipeline at each location to the multiparty diesel
pipeline at Kahului Harbor, Maui and the multiparty diesel pipeline at Hilo
Harbor, Hawaii.  Title and risk of loss shall remain with the respective BUYER.
SELLER shall not be responsible for any type of loss of the Received diesel
while it is in SELLER's custody except when loss or damage is caused by SELLER's
failure to use reasonable care in receiving, handling, storing, or re-delivering
such diesel. Received diesel will be commingled with SELLER's diesel in SELLER's
tankage at SELLER's Neighbor Island Terminals.

                                       7
<PAGE>
 
SECTION 8: DETERMINATION OF QUANTITY OF RECEIVED DIESEL
- -------------------------------------------------------

          The quantity of Received diesel over which SELLER takes custody shall
be determined at the time of each barge cargo unloading by gauging the receiving
tank(s) at SELLER's Neighbor Island Terminal before and after pumping. Volumes
delivered hereunder shall be converted to 60F in accordance with the provisions
of Article VIII of this Contract.  Measurements shall be taken under the
supervision of the Independent Inspector.  BUYER and SELLER shall share equally
the cost of such independent inspections.

SECTION 9: TRANSFER NOTIFICATION
- --------------------------------

          BUYER will provide SELLER's Neighbor Island Terminal representative,
during normal working hours, at least twenty four (24) hours advance notice of
any transfers scheduled from SELLER's Neighbor Island Terminals.

SECTION 10: CUSTODY OF RETURNED DIESEL
- --------------------------------------

          BUYER shall regain care, custody and control of Returned diesel at the
end of the load-rack flange connecting SELLER's load-rack piping to BUYER's
nominated tank trucks.

SECTION 11: DETERMINATION OF QUANTITY OF RETURNED DIESEL
- --------------------------------------------------------

          The quantity of Returned diesel over which SELLER returns custody
shall be determined at the time of each transfer by reading SELLER's calibrated
meters corrected in each instance to volume at 60F in accordance with current
measurement standards adopted by industry, ASTM, API and other standard setting
bodies as applicable in the opinion of the Independent Inspector. If BUYER or
SELLER have reason to believe that the quantity of Returned diesel stated for a
particular transfer is incorrect, that party shall within thirty (30) Days of
the transfer date, present the other party with documentation supporting such
determination and the parties will confer, in

                                       8
<PAGE>
 
good faith, on the causes for the discrepancy and shall proceed to correct such
causes and adjust the quantity, if justified, for the transfers in question.

SECTION 12: DETERMINATION OF BUYER'S INVENTORY
- ----------------------------------------------

          SELLER shall maintain records of the respective BUYER's net diesel
inventories stored at SELLER's Neighbor Island Terminals, determined on the
basis of the accumulated quantities of Received diesel less accumulated
quantities of Returned diesel.  SELLER will provide book inventory records once
each week, convenient to SELLER's normal weekly inventory period.

          SELLER will periodically reconcile meter measurements with tank
gauging.  BUYER may review SELLER's reconciliation calculations.  However, there
will be no retroactive adjustments to the volumes of deliveries of BUYER's
Received diesel or Returned diesel as a result of this procedure.

SECTION 13: RETURNED DIESEL QUANTITY
- ------------------------------------

          SELLER shall be under no obligation to provide BUYER quantities of
Returned diesel greater than BUYER's current net diesel inventory.  However,
SELLER will attempt to meet BUYER's unanticipated needs, after considering the
needs of its other customers and its own available inventory.

SECTION 14: RETURNED DIESEL SAMPLING AND CONDITIONAL ACCEPTANCE
- ---------------------------------------------------------------

          Returned diesel transferred to BUYER by SELLER shall meet the
qualities for Diesel described in Article IV. An Independent Inspector or SELLER
Representative shall draw a volumetric weighted average composite sample
("Terminal Returned Sample") of the diesel in the applicable tanks in SELLER's
Neighbor Island Terminals after each receipt of Received diesel, or SELLER's
diesel, if it is to be commingled with BUYER's diesel, so as to be

                                       9
<PAGE>
 
representative of the entire volume of the commingled inventory of diesel.  The
Terminal Returned Sample is to be divided into a minimum of two (2) parts and
dated.  One part shall be provided to SELLER, a sufficient portion of which is
to be promptly tested by SELLER for its API gravity, appearance and Flash Point.
BUYER and SELLER agree that successful passage of the prompt test on this sample
is sufficient evidence for SELLER to transfer Returned diesel to BUYER, without
limiting BUYER's rights within Section 15 of this Addendum No. 2.  One part
shall be sealed and retained by the Independent Inspector for a period of not
less than three (3) Months.

SECTION 15: QUALITY PROBLEM, DISPUTE AND REMEDY REGARDING RETURNED DIESEL
- -------------------------------------------------------------------------

          Notwithstanding the above conditional acceptance of the Returned
diesel, if a quality problem with the Returned diesel is reasonably indicated,
BUYER may obtain and analyze a sufficient portion of the Terminal Returned
Sample in the possession of the Independent Inspector or SELLER to determine all
the qualities described in Article IV for the Returned diesel.

          If BUYER and SELLER agree or the Independent Inspector determines that
the quality of the Returned diesel did not meet the qualities described in
Article IV, and that the affected SELLER's Neighbor Island Terminal inventories,
including BUYER's diesel stored there and the diesel at BUYER's power plant
inventories are contaminated, both BUYER and SELLER shall attempt to minimize
the impact of any quality problem on SELLER by waiver of SELLER's requirement to
meet quality specifications, especially if BUYER's use of the diesel will not
significantly harm BUYER, or by SELLER returning higher quality diesel to
produce a specification quality blend at the affected SELLER's Neighbor Island
Terminal inventory and

                                      10
<PAGE>
 
BUYER's plant inventories.  If all such, and similar, efforts fail to resolve
the quality problem, then SELLER will, at SELLER's expense, exchange BUYER's
diesel and to the extent the contamination of BUYER's other similar diesel was
not caused or contributed to by BUYER, any of BUYER's other similar diesel which
has been downgraded by commingling with the Returned diesel, with diesel meeting
the qualities described in Article IV.

          All costs and expenses, including, but not limited to, demurrage
incurred by BUYER's or SELLER's Nominated Barge, transportation, and handling
costs incurred in waiting to unload, returning and replacing BUYER's
contaminated diesel and any demurrage, transportation, re-refining and handling
costs incurred by SELLER in returning and replacing said contaminated diesel
shall be borne by SELLER, provided that SELLER confirms the quality problem
indicated by BUYER.

          If SELLER disputes BUYER's claim of quality problems with the Returned
diesel and other similar diesel, objects to BUYER's refusal to transfer some or
all of the Returned diesel in question into BUYER's nominated trucks on the
basis of BUYER's examination of the relevant quality documentation or as a
result of BUYER's laboratory analyses of the Terminal Returned Sample, and any
other relevant samples, or in the event that any claim made by BUYER related to
the quality of Returned diesel is not resolved within thirty (30) Days of the
original claim, the Terminal Returned Sample, Barge Received Sample, Barge
Composite After Loading Sample, Barge O.B.Q. Sample and any other relevant
samples in the possession of SELLER, BUYER or the Independent Inspector shall be
submitted to a mutually agreed upon independent laboratory for testing and
analysis, whose determination shall be final and binding on both parties.  In
the event BUYER is found to be correct, SELLER shall pay the cost of such
independent inspection.

                                      11
<PAGE>
 
In the event SELLER is found to be correct, BUYER shall pay the cost of such
independent inspection.

          BUYER shall have the responsibility for all costs and expenses,
including, but not limited to demurrage incurred by BUYER's or SELLER's
Nominated Barge, transportation, and handling costs incurred in waiting,
loading, unloading, returning and replacing BUYER's contaminated diesel and any
demurrage, transportation, re-refining and handling costs incurred by BUYER in
returning and replacing its contaminated diesel if it is determined that the
qualities described in Article IV of this Contract are met by the Returned
diesel in question.

          However, in no event shall either party be liable for any indirect,
consequential, special or incidental damages of any kind whether based in
contract, tort (including without limitation negligence or strict liability),
warranty or otherwise allegedly caused by or based upon the quality of the
Returned diesel.

SECTION 16: TERMINALING AND HANDLING FEES
- -----------------------------------------

          SELLER will invoice BUYER and BUYER will pay SELLER in accordance with
the terms of Article VI of this Contract, terminaling and handling fees based on
the quantities of Received diesel determined in accordance with the provisions
of Section 8 of this Addendum No. 2 at the rates listed below.

    i.    At SELLER's Kahului Terminal, the terminaling and handling fee shall
          be [---] per physical barrel of Received diesel.

    ii.   At SELLER's Hilo Terminal, the terminaling and handling fee shall be 
          [---] per physical barrel of Received diesel.

                                      12
<PAGE>
 
    iii.  The terminaling and handling fees specified in the Section 16.i and
          Section 16.ii shall be subject to [---] beginning [---] , and for each
          [---] thereafter, including any in an Additional Term, on the basis of
          the arithmetic average of two components each weighted equally. One
          component is the arithmetic average of the Producer Price Index for
          Industrial Commodities ("PPI") as published by the U.S. Department of
          Labor, Bureau of Labor Statistics for the period July through
          September preceding every January 1 in which terminaling and handling
          services are rendered by SELLER hereunder, divided by 128.700. The
          second component is the arithmetic average of the hourly earnings in
          dollars per hour for the petroleum and coal products industry as
          reported in "Employment and Earnings" published by the U.S. Department
          of Labor, Bureau of Labor Statistics ("EE") for the period July
          through September preceding every January 1 in which terminaling and
          handling services are rendered by SELLER hereunder, divided by 20.353.

For the purpose of invoicing, the terminaling and handling services shall be
considered received by BUYER when SELLER first takes custody of BUYER's Received
diesel.

SECTION 17: REQUIRED INSURANCE
- ------------------------------

          Without in any way limiting BUYER's liability pursuant to this
Contract, BUYER shall maintain and require any carrier to maintain the following
insurance and all insurance that may be required under the applicable laws,
ordinances, and regulations of any governmental authority:

          i.   Workers' Compensation and Employers' Liability Insurance as
               prescribed by applicable law, including insurance covering
               liability under the

                                      13
<PAGE>
 
               Longshoremen's and Harbor Workers' Act, the Jones Act and the
               Outer Continental Shelf Land Act, if applicable.

          ii.  Commercial General Liability Insurance including Bodily Injury
               and Property Damage Insurance with a limit not less than
               $1,000,000 combined single limit per occurrence. Such insurance
               shall include the following coverages: Broad Form Contractual
               Liability and Personal Injury Liability.

          iii. Automobile Bodily Injury and Property Damage Liability Insurance
               on all owned, non-owned and hired vehicles used in receiving
               diesel from SELLER's Neighbor Island Terminals with a limit not
               less than $1,000,000 combined single limit per occurrence for
               bodily injury and property damage, and shall include an
               endorsement, form "CC 00 31 12 89, Changes in Business Auto and
               Truckers Policies - Mobile Equipment, Contractual Liability and
               Pollution (Hawaii)," or its equivalent, to provide pollution
               liability coverage.

          The above insurance shall include a requirement that the insurer
provide SELLER with thirty (30) Days' written notice prior to the effective date
of any cancellation or material change of the insurance.  The insurance
specified in Sections i. shall contain a waiver of subrogation against SELLER
and an assignment of statutory lien, if applicable.  The insurance specified in
Sections ii. and iii. shall name SELLER as an additional insured provided that
the insurance is primary in coverage with respect to all policies of insurance
that may be applicable, and contain a standard cross-liability endorsement or
severability of interest clause.

          Before SELLER shall be obliged to render the terminaling and handling
services described herein, BUYER shall provide SELLER with certificates or other
documentary evidence satisfactory to SELLER of the insurance coverages and
endorsements.

          Without in any way limiting SELLER's liability, SELLER shall obtain
from any carrier of diesel related to this Contract the insurance coverages and
endorsements set forth in this Article excepting that both SELLER and BUYER be
named as additional insured.

          The terminaling and handling fees listed in Section 14 do not include
any insurance covering loss of BUYER's diesel while it is in the custody of
SELLER. It is expressly understood 

                                      14
<PAGE>
 
and agreed that insurance, if any is desired by BUYER, shall be carried by BUYER
at its own expense.

          SELLER reserves the right to change insurance requirements
periodically upon reasonable notice to BUYER.

SECTION 18: BARGE AND VEHICLE STANDARDS
- ---------------------------------------

          BUYER's Nominated Barge used to deliver diesel to SELLER's Neighbor
Island Terminals shall be subject to the provisions of Section 7.3 herein

          Any truck lifting at SELLER's Neighbor Island Terminals shall be
inspected and approved by the SELLER using SELLER's guidelines which shall be
provided to BUYER.  In addition any Driver must be approved and certified by
SELLER periodically, to enter and receive Returned diesel at SELLER's Neighbor
Island Terminals.

SECTION 19: NOTICES
- -------------------

          Notices for the for forecast available storage, barge arrival or
delivery timing, diesel quality notifications, or transfer notifications shall
be made to the following addresses:

          MAUI:     BHPP Terminals
                    Terminal Supervisor
                    140-A Hobron Avenue
                    Kahului, Hawaii 96732
                    Telephone (808) 871-0817
                    Facsimile (808) 871-0728

                    Maui Electric Company, Ltd..
                    Production Department
                    P.O. Box 398
                    Kahului, Hawaii 96732
                    Telephone (808) 242-7796
                    Facsimile (808) 244-5260
 
                                      15
<PAGE>
 
           HAWAII:  BHPP Terminals
                    Terminal Supervisor
                    700 Kalanianaole Avenue
                    Hilo, Hawaii 96720             
                    Telephone (808) 961-3177       
                    Facsimile (808) 969-1085       
                                                   
                    Hawaii Electric Light Co., Inc.
                    Production Department          
                    P.O. Box 1027                  
                    Hilo, Hawaii 96720             
                    Telephone (808) 969-0423       
                    Facsimile (808) 969-0425        
 
                                      16
<PAGE>
 
                                   EXHIBIT A

                   NO. 6 INDUSTRIAL FUEL OIL  SPECIFICATIONS
                   -----------------------------------------
<TABLE>
<CAPTION>
 
Specification -  Test Item      Measurement Unit       Limits        ASTM Method
- --------------------------      ----------------   ---------------   -----------
<S>                             <C>                <C>               <C>           
GRAVITY @ 60 DEGREES F.         Degrees API           6.5 Min.        D-1298,
                                                                      D-4052-86
 
FLASH POINT                     Degrees F.            150 Min.        D-93

 
VISCOSITY                       SSF At 77 DF           - - -          D-445,
                                                                      D-2161
 
VISCOSITY                       SSF At 122 DF         179 Min.        D-445,
                                                      226 Max.        D-2161
 
POUR POINT                      Degrees F.            55 Max.         D-97,
                                                                      D-5949
 
SULFUR                          Percent, Weight       2.00 Max.       D-1552,
                                                                      D-2622,
                                                                      D-4294
 
VANADIUM                        PPM, Wt.              100 Max.        D-5863, AES
 
NITROGEN                        PPM, Wt               6500 Max.       D-5762,       
                                                                      D-4629
 
SEDIMENT & WATER                Percent, Volume       0.50 Max.       D-1796
 
HEAT VALUE, GROSS               MM BTU/BBL            6.2 Min.        D-240,
                                                                      D-4868
 
HEAT VALUE, NET                 MM BTU/BBL            Report          D-240,
                                                                      D-4868
 
LOADING TEMPERATURE             Degrees F.            110 Min.        n/a           
                                                      170 Max
</TABLE>
                                       1
<PAGE>
 
[---]


ii.  Expressed in USD per barrel, converting to barrels from metric tonnes by
     dividing by 6.368.

          = [---]
 
[---]

 

iii. [---] and received by BUYER in each Year of the indicated period.

     Assume [---] apply:

          [---] barrels:    [---] per barrel
          [---] barrels:    [---] per barrel
          [---] barrels:    [---] per barrel

     Assume further that the [---] thus

[---]

HC =  The actual gross heat content of each Fuel Oil Delivery pursuant to
      Section 5.5 expressed in MM BTU per barrel with three significant figures
      to the right of the decimal point.


T = Taxes applicable to sale of Fuel Oil
- ----------------------------------------

HGET = 4.166% of pre-HGET price
Hawaii Environmental Response Tax applied after HGET = $0.05 per barrel

                                       2
<PAGE>
 
I.  PRICE FOR FUEL OIL WITH A STANDARD GROSS HEAT CONTENT [---] PER BARREL)

= [---]

= [---]

= [---]


II. PRICE FOR FUEL OIL PRICE WITH AN ASSUMED GROSS HEAT CONTENT OTHER
    THAN STANDARD

(HC = Assumed gross heat content is [---] per barrel)

= [---]

= [---]

= [---]

= [---]




EXPLANATION OF TAXES:
- ---------------------

Taxes in the Fuel Oil price currently in effect include the Hawaii Environmental
Response Tax of $0.050 per barrel. Also, Hawaii State General Excise Tax of
4.166% will be paid on all components of the Fuel Oil price, except at the
execution of this Contract the Hawaii Environmental Response Tax.

                                       3
<PAGE>
 
                                   EXHIBIT B

                             DIESEL SPECIFICATIONS
                             ---------------------
<TABLE>
<CAPTION>
Specification -  Test Item          Measurement Unit       Limits   ASTM Method     
- --------------------------          ----------------       ------   -----------     
<S>                                    <C>                <C>          <C>
GRAVITY @ 60 DEGREES F.                Degrees API        30.0 Min.    D-1298,
                                                                       D-4052-86
 
SPECIFIC GRAVITY 60/60 DEGREES F.      n/a                .8762 Max.   D-1298,
                                                                       D-4052-86
 
VISCOSITY                              SSU @ 104 DF       32.3 Min.    D-445,
                                                          39.4 Max.    D-2161
                                       SSU @ 100 DF       32.6 Min.
                                                          40.1 Max.
 
FLASH POINT,  PM                       Degrees F.         150 Min.     D-93
 
POUR POINT                             Degrees F.         37.4 Max.    D-97
 
ASH                                    PPM, Wt.           100 Max.     D-482
 
CETANE INDEX                           n/a                40 Min.      D-4737
 
CARBON RESIDUE,
10% RESIDUUM                           %, Wt.             .35 Max.     D-524
 
SEDIMENT & WATER                       Percent, Vol.      0.05 Max.    D-1796
 
SULFUR                                 Percent, Wt.       0.40 Max.    D-1552, 2622
                                                                       D-4294
 
VANADIUM                               PPM, Wt.           0.8 Max      D-3605, AES
 
DISTILLATION,
90% RECOVERED                          Degrees F.         540 - 650    D-86
 
SODIUM+POTASSIUM                       PPM, Wt.           0.5 Max.     D-3605
 
SODIUM+POTASSIUM+LITHIUM               PPM, Wt.           0.6 Max.     D-3605,
                                                                       AES
</TABLE>
                                       1
<PAGE>
 
                                   EXHIBIT B
                             DIESEL SPECIFICATIONS
                             ---------------------
<TABLE>
<S>                      <C>          <C>        <C>       
NITROGEN                  PPM, Wt.    150 Max.   D-4629,   
                                                 D-5762

 
* HEAT VALUE, GROSS      MM BTU/BBL   5.86       D-240,
                                                 D-4868
 
HEAT VALUE, NET          MM BTU/BBL   Report     D-240,
                                                 D-4868
</TABLE>


* Typical Value

                                       2
<PAGE>
 
                                   EXHIBIT C
                                   ---------

                    NO. 6 FUEL OIL EXAMPLE PRICE CALCULATION
                    ----------------------------------------

                    Illustrative Price Calculation for [---]

The price in U.S. Dollars ("USD") per barrel of No. 6 Fuel Oil shall be
determined Monthly on the basis of the following price formula:

                                     [---]
 
 
i.   The simple average of the high and low price assessments for Los Angeles
     Bunker C Fuel Oil as reported by the Platt's Bunkerwire on all dates of
     publication during the period beginning the 21st Day of the second Month
     preceding the Month of Delivery and ending the 20th Day of the Month
     preceding the Month of Delivery.
 
BP = Platt's Bunkerwire Los Angeles Bunker C
- --------------------------------------------
<TABLE> 
<CAPTION> 
                           Price in USD per Metric Tonne                                       
                 Date             Low           High       Average                             
                 ----             ---           ----       -------                             
                 <S>             <C>           <C>         <C>                                 
                 [---]           [---]         [---]       [---]                               
                 [---]           [---]         [---]       [---]                               
                 [---]           [---]         [---]       [---]                               
                 [---]           [---]         [---]       [---]                               
                 [---]           [---]         [---]       [---]                               
                 [---]           [---]         [---]       [---]                               
                 [---]           [---]         [---]       [---]                               
                 [---]           [---]         [---]       [---]                               
                 [---]           [---]         [---]       [---]                               
                 [---]           [---]         [---]       [---]                               
                 [---]           [---]         [---]       [---]                               
                 [---]           [---]         [---]       [---]                               
                 [---]           [---]         [---]       [---]                               
                 [---]           [---]         [---]       [---]                               
                 [---]           [---]         [---]       [---]                               
                 [---]           [---]         [---]       [---]                               
                 [---]           [---]         [---]       [---]                               
                 [---]           [---]         [---]       [---]                               
                 [---]           [---]         [---]       [---]                               
                 [---]           [---]         [---]       [---]                               
                 [---]           [---]         [---]       [---]                                
</TABLE>
                                       1
<PAGE>
 
                                   EXHIBIT D
                                   ---------

                       DIESEL EXAMPLE PRICE CALCULATION
                       --------------------------------

                   Illustrative Price Calculation for [---]

The price in U.S. Dollars ("USD") per gallon of Diesel shall be determined
Monthly on the basis of the following price formula:


                                     [---]
 
i.  The simple average of the high and low price assessments for West Coast
    Pipeline, Los Angeles California Low Sulfur No. 2 Diesel as reported by
    Platt's Oilgram on all dates of publication during the period beginning the
    21st Day of the second Month preceding the Month of Delivery and ending the
    20th Day of the Month preceding the Month of Delivery, expressed in USD per
    gallon.
 
DP = Platt's Oilgram, West Coast Pipeline, Los Angeles California LS No. 2
     ---------------------------------------------------------------------
     Diesel Price
     ------------
<TABLE> 
<CAPTION> 
 
Date of Price           Price in USD per gallon         
                     Low          High       Average    
                     ---          ----       -------    
   <S>              <C>          <C>         <C>        
   [---]            [---]        [---]        [---]     
   [---]            [---]        [---]        [---]                                                   
   [---]            [---]        [---]        [---]                                                   
   [---]            [---]        [---]        [---]                                                   
   [---]            [---]        [---]        [---]                                                   
   [---]            [---]        [---]        [---]                                                   
   [---]            [---]        [---]        [---]                                                   
   [---]            [---]        [---]        [---]                                                   
   [---]            [---]        [---]        [---]                                                   
   [---]            [---]        [---]        [---]                                                   
   [---]            [---]        [---]        [---]                                                   
   [---]            [---]        [---]        [---]                                                   
   [---]            [---]        [---]        [---]                                                   
   [---]            [---]        [---]        [---]                                                   
   [---]            [---]        [---]        [---]                                                   
   [---]            [---]        [---]        [---]                                                   
   [---]            [---]        [---]        [---]                                                   
   [---]            [---]        [---]        [---]                                                   
   [---]            [---]        [---]        [---]                                                   
   [---]            [---]        [---]        [---]                                                   
   [---]            [---]        [---]        [---]      
</TABLE>
                                       1
<PAGE>
 
[---]
[---]

ii. [---]

    Assume [---] apply:

          [---] barrels:    [---] per gallon
          [---] barrels:    [---] per gallon
          [---] barrels:    [---] per gallon

    Assume further that the [---] thus

[---]

HC =  The actual gross heat content of each Diesel Delivery pursuant to Section
      5.5 expressed in BTUs per gallon.


T = Taxes applicable to sale of Diesel
- --------------------------------------

HGET = 4.166% of pre-HGET price

Taxes after application of Hawaii General Excise Tax (HGET):
       Hawaii Environmental Response Tax = $0.05 per barrel, $0.0012 per gallon
       Hawaii Liquid Fuel Tax  = $0.01 per gallon


I. PRICE FOR DIESEL DELIVERED INTO BUYER'S NOMINATED BARGE HAVING A STANDARD
   GROSS HEAT CONTENT [---]

= [---]

= [---]

= [---]

                                       2
<PAGE>
 
II.  PRICE FOR DIESEL DELIVERED INTO BUYER'S NOMINATED BARGE HAVING AN ASSUMED
     GROSS HEAT CONTENT OTHER THAN STANDARD

(HC = Assumed gross heat content is [---]

= [---]

= [---]

= [---]

= [---]


III. PRICE FOR DIESEL DELIVERED TO BUYER'S NOMINATED MARINE TERMINAL AT KAHULUI,
     MAUI, HILO, HAWAII OR KAWAIHAE HAWAII BARGE HAVING HAVING A STANDARD GROSS
     HEAT CONTENT [---]

For Diesel sold and Delivered in bulk by SELLER and purchased and received in
bulk by BUYER at Kahului, Maui, or at Hilo or Kawaihae, Hawaii, BUYER shall pay
an [---] applicable only to such Diesel, in each Year of the indicated period.

Assume [---] apply:

[---] per [---] for the [---] purchased
by MECO, received in Kahului Maui, in $/gallon:  [---]

[---] per [---] for the [---] purchased
by HELCO, received in Hilo Hawaii, in $/gallon.   [---]

[---] per [---] for the [---] purchased
by HELCO, received in Kawaihae Hawaii, in $/gallon. [---]

a. FOR DIESEL IN BULK RECEIVED BY MECO IN KAHULUI:

[---]
= [---]

                                       3
<PAGE>
 
= [---]

= [---]


b. FOR DIESEL IN BULK RECEIVED BY HELCO IN HILO:

[---]

= [---]

= [---]

= [---]

c. FOR DIESEL IN BULK RECEIVED BY HELCO IN KAWAIHAE:

[---]

= [---]

= [---]

= [---]






EXPLANATION OF TAXES:
- -------------------- 
Taxes in the Diesel price currently in effect include the Hawaii Environmental
Response Tax of $0.050 per barrel ($0.0012 per gallon) and the Hawaii Liquid
Fuel Tax of $0.01 per gallon. Also, the Hawaii State General Excise Tax of
4.166% will be paid on all components of the Diesel price, except at the
execution of this Contract the Hawaii Environmental Response Tax and the Hawaii
Liquid Fuel Tax

                                       4

<PAGE>
 
                                              HECO Exhibit 10.13(a)
                                              ---------------------



[ Hawaiian Electric Company, Inc. letterhead ]



                                              December 01, 1997



HAWAIIAN INTERISLAND TOWING, INC.
Attention:  Mr. Gordon Smith, President
Pier 21, Main Office
Honolulu, HI 96817

Dear Mr. Smith:

SUBJECT:  OPTION TO EXTEND TERM UNDER CONTRACT OF PRIVATE CARRIAGE BY AND
          BETWEEN HAWAIIAN INTERISLAND TOWING, INC. AND HAWAII ELECTRIC LIGHT
          COMPANY, INC.

This letter will confirm the understanding between HAWAIIAN INTERISLAND TOWING,
INC. ("HITI") and Hawaii Electric Light Company, Inc. ("HELCO") relating to the
extension of the Contract Of Private Carriage by and between HELCO and HITI,
dated November 10, 1993 ("Contract").

It has been mutually agreed to by HELCO and HITI that the Contract is hereby
extended in accordance with Section 1.2, "Option to Extend Term," as amended by
the "Sixth Amendment To Contract of Private Carriage By and Between HAWAIIAN
INTERISLAND TOWING, INC. and Hawaii Electric Light Company, Inc.," dated October
1, 1997, for a period of two (2) years commencing January 1, 1998.

If this letter correctly sets forth our understanding and agreement, would you
please indicate your acceptance and agreement in the space below and return a
signed copy for our records.


HAWAIIAN ELECTRIC COMPANY, INC., AS AGENT



By    /s/ Jeffrey C. Aicken
    -----------------------
   Jeffrey C. Aicken, Director, Fuel Resources



                                       1

<PAGE>
 
Accepted and agreed to this 1st day of December, 1997.



HAWAIIAN INTERISLAND TOWING, INC.



By    /s/ Gordon Smith
    ---------------------------------------------------
    name: Gordon Smith               title: President



cc:  T.C. Simmons
     S.A. Gonsalves
     D. Heinzen



     

                                       2

<PAGE>
 
                                              HECO Exhibit 10.14(a)
                                              ---------------------



[ Hawaiian Electric Company, Inc. letterhead ]



                                              December 01, 1997



HAWAIIAN INTERISLAND TOWING, INC.
Attention:  Mr. Gordon Smith, President
Pier 21, Main Office
Honolulu, HI 96817

Dear Mr. Smith:

SUBJECT:  OPTION TO EXTEND TERM UNDER CONTRACT OF PRIVATE CARRIAGE BY AND
          BETWEEN HAWAIIAN INTERISLAND TOWING, INC. AND MAUI ELECTRIC COMPANY,
          LTD.

This letter will confirm the understanding between HAWAIIAN INTERISLAND TOWING,
INC. ("HITI") and Maui Electric Company, Ltd. ("MECO") relating to the extension
of the Contract Of Private Carriage by and between HITI and MECO, dated November
13, 1993 ("Contract").

It has been mutually agreed to by HITI and MECO that the Contract is hereby
extended in accordance with Section 1.2, "Option to Extend Term," as amended by
the "Sixth Amendment To Contract of Private Carriage By and Between HAWAIIAN
INTERISLAND TOWING, INC. and Maui Electric Company, Ltd.," dated October 1,
1997, for a period of two (2) years commencing January 1, 1998.

If this letter correctly sets forth our understanding and agreement, would you
please indicate your acceptance and agreement in the space below and return a
signed copy for our records.


HAWAIIAN ELECTRIC COMPANY, INC., AS AGENT



By    /s/ Jeffrey C. Aicken
    ---------------------------------------------
      Jeffrey C. Aicken, Director, Fuel Resources



                                       1
<PAGE>
 
Accepted and agreed to this 1st day of December, 1997.



HAWAIIAN INTERISLAND TOWING, INC.



By    /s/ Gordon Smith
    -------------------------------------------------
     name: Gordon Smith               title: President



cc:  T.C. Simmons
     S.A. Gonsalves
     S. Kiyonaga



                                       2

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM HAWAIIAN
ELECTRIC INDUSTRIES, INC. AND SUBSIDIARIES' CONSOLIDATED BALANCE SHEET AS OF
DECEMBER 31, 1997 AND CONSOLIDATED STATEMENT OF INCOME FOR THE YEAR ENDED
DECEMBER 31, 1997 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000354707
<NAME> HAWAIIAN ELECTRIC INDUSTRIES, INC.
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               DEC-31-1997
<CASH>                                         254,356
<SECURITIES>                                 1,971,886
<RECEIVABLES>                                  166,018
<ALLOWANCES>                                     7,726
<INVENTORY>                                     45,412
<CURRENT-ASSETS>                                     0
<PP&E>                                       2,994,317
<DEPRECIATION>                                 974,759
<TOTAL-ASSETS>                               7,953,882
<CURRENT-LIABILITIES>                                0
<BONDS>                                        802,575
                           85,770
                                    148,293
<COMMON>                                       654,819
<OTHER-SE>                                     159,862
<TOTAL-LIABILITY-AND-EQUITY>                 7,953,882
<SALES>                                              0
<TOTAL-REVENUES>                             1,463,979
<CGS>                                                0
<TOTAL-COSTS>                                1,252,121
<OTHER-EXPENSES>                                 (201)
<LOSS-PROVISION>                                 5,669
<INTEREST-EXPENSE>                              64,607
<INCOME-PRETAX>                                141,783
<INCOME-TAX>                                    55,341
<INCOME-CONTINUING>                             86,442
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    86,442
<EPS-PRIMARY>                                     2.76<F1>
<EPS-DILUTED>                                     2.75
         
<FN> 
<F1> REPRESENTS EPS-BASIC
</FN>

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 5
<LEGEND>
THIS RESTATED SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
HAWAIIAN ELECTRIC INDUSTRIES, INC. AND SUBSIDIARIES' CONSOLIDATED BALANCE SHEET
AS OF DECEMBER 31, 1996 AND CONSOLIDATED STATEMENT OF INCOME FOR THE YEAR ENDED
DECEMBER 31, 1996 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED>
<CIK> 0000354707
<NAME> HAWAIIAN ELECTRIC INDUSTRIES, INC.
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-START>                             JAN-01-1996
<PERIOD-END>                               DEC-31-1996
<CASH>                                          97,417
<SECURITIES>                                 1,377,591
<RECEIVABLES>                                  155,730
<ALLOWANCES>                                     4,872
<INVENTORY>                                     48,745
<CURRENT-ASSETS>                                     0
<PP&E>                                       2,831,822
<DEPRECIATION>                                 890,055
<TOTAL-ASSETS>                               5,935,840
<CURRENT-LIABILITIES>                                0
<BONDS>                                        810,080
                           38,955
                                     48,293
<COMMON>                                       622,945
<OTHER-SE>                                     149,907
<TOTAL-LIABILITY-AND-EQUITY>                 5,935,840
<SALES>                                              0
<TOTAL-REVENUES>                             1,410,572
<CGS>                                                0
<TOTAL-COSTS>                                1,217,890
<OTHER-EXPENSES>                              (11,074)
<LOSS-PROVISION>                                 4,436
<INTEREST-EXPENSE>                              65,832
<INCOME-PRETAX>                                133,488
<INCOME-TAX>                                    54,830
<INCOME-CONTINUING>                             78,658
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    78,658
<EPS-PRIMARY>                                     2.60<F1>
<EPS-DILUTED>                                     2.59
        
<FN> 
<F1> REPRESENTS EPS-BASIC
</FN>

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 5
<LEGEND>
THIS RESTATED SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
HAWAIIAN ELECTRIC INDUSTRIES, INC. AND SUBSIDIARIES' CONSOLIDATED BALANCE SHEET
AS OF DECEMBER 31, 1995 AND CONSOLIDATED STATEMENT OF INCOME FOR THE YEAR ENDED
DECEMBER 31, 1995 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED>
<CIK> 0000354707
<NAME> HAWAIIAN ELECTRIC INDUSTRIES, INC.
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1995
<PERIOD-START>                             JAN-01-1995
<PERIOD-END>                               DEC-31-1995
<CASH>                                         130,833
<SECURITIES>                                 1,479,552
<RECEIVABLES>                                  145,521
<ALLOWANCES>                                     3,016
<INVENTORY>                                     35,258
<CURRENT-ASSETS>                                     0
<PP&E>                                       2,623,742
<DEPRECIATION>                                 815,547
<TOTAL-ASSETS>                               5,603,745
<CURRENT-LIABILITIES>                                0
<BONDS>                                        758,463
                           41,750
                                     48,293
<COMMON>                                       585,387
<OTHER-SE>                                     144,216
<TOTAL-LIABILITY-AND-EQUITY>                 5,603,745
<SALES>                                              0
<TOTAL-REVENUES>                             1,295,924
<CGS>                                                0
<TOTAL-COSTS>                                1,105,196
<OTHER-EXPENSES>                               (8,429)
<LOSS-PROVISION>                                 3,064
<INTEREST-EXPENSE>                              62,860
<INCOME-PRETAX>                                133,233
<INCOME-TAX>                                    55,740
<INCOME-CONTINUING>                             77,493
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    77,493
<EPS-PRIMARY>                                     2.66<F1>
<EPS-DILUTED>                                     2.65
        
<FN> 
<F1> REPRESENTS EPS-BASIC
</FN>

</TABLE>

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> UT
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM HAWAIIAN
ELECTRIC COMPANY, INC. AND SUBSIDIARIES' CONSOLIDATED BALANCE SHEET AS OF
DECEMBER 31, 1997 AND CONSOLIDATED STATEMENT OF INCOME AND CASH FLOWS FOR THE
YEAR ENDED DECEMBER 31, 1997 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO
SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000046207
<NAME> HAWAIIAN ELECTRIC COMPANY, INC.
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               DEC-31-1997
<BOOK-VALUE>                                  PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                    1,893,105
<OTHER-PROPERTY-AND-INVEST>                          0
<TOTAL-CURRENT-ASSETS>                         168,597
<TOTAL-DEFERRED-CHARGES>                        13,085
<OTHER-ASSETS>                                 137,527
<TOTAL-ASSETS>                               2,212,314
<COMMON>                                        85,387
<CAPITAL-SURPLUS-PAID-IN>                      296,266
<RETAINED-EARNINGS>                            387,582
<TOTAL-COMMON-STOCKHOLDERS-EQ>                 769,235
                           83,175
                                     48,293
<LONG-TERM-DEBT-NET>                           597,621
<SHORT-TERM-NOTES>                                 400
<LONG-TERM-NOTES-PAYABLE>                            0
<COMMERCIAL-PAPER-OBLIGATIONS>                  95,181
<LONG-TERM-DEBT-CURRENT-PORT>                   30,000
                        2,595
<CAPITAL-LEASE-OBLIGATIONS>                          0
<LEASES-CURRENT>                                     0
<OTHER-ITEMS-CAPITAL-AND-LIAB>                 585,814
<TOT-CAPITALIZATION-AND-LIAB>                2,212,314
<GROSS-OPERATING-REVENUE>                    1,098,755
<INCOME-TAX-EXPENSE>                            52,795
<OTHER-OPERATING-EXPENSES>                     934,920
<TOTAL-OPERATING-EXPENSES>                     987,715
<OPERATING-INCOME-LOSS>                        111,040
<OTHER-INCOME-NET>                              19,042
<INCOME-BEFORE-INTEREST-EXPEN>                 130,082
<TOTAL-INTEREST-EXPENSE>                        48,233
<NET-INCOME>                                    81,849
                      3,660
<EARNINGS-AVAILABLE-FOR-COMM>                   78,189
<COMMON-STOCK-DIVIDENDS>                        58,377
<TOTAL-INTEREST-ON-BONDS>                       42,317
<CASH-FLOW-OPERATIONS>                         138,907
<EPS-PRIMARY>                                        0<F1>
<EPS-DILUTED>                                        0
        
<FN> 
<F1> REPRESENTS EPS-BASIC
</FN>

</TABLE>

<PAGE>
 
                                                                HEI Exhibit 99.1
                                                                ----------------
                                        
                                        

                       HAWAIIAN ELECTRIC INDUSTRIES, INC.
                 DIVIDEND REINVESTMENT AND STOCK PURCHASE PLAN
                 ---------------------------------------------
                     (As amended through February 2, 1998)


Section 1.  Name and Number of Shares
- -------------------------------------

          The plan shall be known as the "Dividend Reinvestment and Stock
Purchase Plan" (the "Plan").  The Plan permits (i) holders of record of the
Common Stock of Hawaiian Electric Industries, Inc. (the "Company"), (ii) holders
of record of the preferred stock ("Preferred Stock") of any class or series of
Hawaiian Electric Company, Inc., Maui Electric Company, Limited and Hawaii
Electric Light Company, Inc., each of which is a direct or indirect subsidiary
of the Company, and (iii) any other individual of legal age or any entity, to
purchase common stock of the Company ("Common Stock").  The number of shares of
Common Stock which may be issued pursuant to the Plan shall be fixed from time
to time by the Board of Directors of the Company.


Section 2.  Administration and Costs
- ------------------------------------

          The administrator of the Plan (the "Administrator") shall administer
the Plan for participants, keep records, send statements of accounts to
participants, and perform other clerical and ministerial duties relating to the
Plan.  The Administrator may be one or more officers or employees of the Company
or of its subsidiaries and shall be appointed from time to time by the
President, the Financial Vice President or the Treasurer of the Company.  If the
Administrator is one or more employees of the Company, an independent trustee
(the "Trustee") shall be appointed by the President, the Financial Vice
President or the Treasurer of the Company, and shares under the Plan shall be
registered in the name of the Trustee.  The initial Administrator shall be the
Shareholder Services Division of the Company.

          Participants in the Plan will bear the cost of brokerage fees and
commissions, any service charges and applicable taxes related to shares
purchased or sold on the open market.  The Company may also charge each
participant fees up to amounts that are reasonably related to the actual
administrative costs of the Plan, the amounts, frequency and manner of payment
of which shall be determined from time to time by the President, Financial Vice
President and Treasurer of the Company, or any of them.
<PAGE>
 
Section 3.  Eligibility and Enrollment
- --------------------------------------

          The following persons shall be eligible to participate in the Plan
(the "participants") in accordance with the following enrollment procedures:

          (a) Each holder of record of Common Stock and/or Preferred Stock shall
be eligible to participate in the Plan.  In order to participate in the Plan,
owners of Common Stock and/or Preferred Stock whose shares are registered in
names other than their own (e.g., broker, bank nominee) must first either become
holders of record by having shares of Common Stock and/or Preferred Stock, as
the case may be, transferred into their own names or transfer shares of Common
Stock to the name of the Administrator (or the Trustee, if there is a Trustee)
for safekeeping under the Plan.  In addition, an eligible stockholder must
complete and sign the Company-approved authorization form ("Shareholder
Authorization Form") for Common Stock and/or Preferred Stock, as the case may
be, and return it to the Administrator in the manner prescribed on the
Shareholder Authorization Form or in the current prospectus for the Plan.  A
Shareholder Authorization Form must be received by the Administrator by the
dividend record date in order for the dividends for which the record is taken to
be reinvested under the Plan.  The execution of a Shareholder Authorization Form
will result in the participation in the Plan of all Common Stock and all classes
and series of Preferred Stock registered in the participant's name unless the
participant indicates on the Form the number and kind of shares on which the
participant wishes to receive cash dividends.  If a participant does not select
an option on the Shareholder Authorization Form, all dividends for all shares of
Common Stock and Preferred Stock held in the participant's name, and on all
shares held under the Plan for the participant, will be reinvested.  A
participant may change any of the designations set forth in a Shareholder
Authorization Form by completing, signing and returning to the Administrator a
new Shareholder Authorization Form in the manner described above, which new Form
shall supersede the prior Form, or may make such changes in such other manner as
may be permitted by the Administrator.

          (b) Any other individual of legal age or entity shall be eligible to
participate in the Plan.  In order to participate in the Plan, each such
individual or entity must complete and sign the Company's enrollment form (the
"Non-holder Enrollment Form") and return it to the Administrator along with a
check or money order made payable to HEI/DRIP for an initial stock purchase of
not less than $250 and not more than $120,000.  The execution of Non-holder
Enrollment Form will result in the reinvestment of all dividends held under the
Plan for the participant, unless the

                                       2
<PAGE>
 
participant submits a Shareholder Authorization Form and selects a different
investment option in that Form.

          (c) Each participant may, pursuant to the Shareholder Authorization
Form and/or such other forms as the Administrator may from time to time
prescribe, elect one of the following three investment options:  (1) under the
"full dividend reinvestment" option, a participant may reinvest cash dividends
on all shares of Common Stock and Preferred Stock registered in the name of a
participant and on all shares of Common Stock held under the Plan for the
participant to purchase additional shares of Common Stock; (2) under the
"partial dividend reinvestment" option, a participant may receive cash dividends
on a portion of the shares of Common Stock and/or Preferred Stock registered in
such participant's name and/or on a portion of the shares of Common Stock held
under the Plan for the participant, and reinvest the remainder of cash dividends
on such shares to purchase Common Stock; and (3) under the "optional cash
investment only/no dividend reinvestment" option, a participant may receive cash
dividends on all shares of Common Stock and/or Preferred Stock registered in the
participant's name and on shares of Common Stock held under the Plan for the
participant.  Under any of the investment options, a participant may purchase
additional shares of Common Stock under the Plan by making optional cash
payments to the Plan as provided under Section 5.  A participant may change such
participant's investment option by following the procedures under Section 3(a)
for changing the designations set forth in a Shareholder Authorization Form
and/or such other procedures as the Administrator may from time to time
prescribe.

          (d) Shareholder Authorization and Non-holder Enrollment Forms shall be
made available by the Administrator.

          (e) Each participant will remain a participant in the Plan until
participation is terminated pursuant to Section 12 hereof or until the Plan
itself is terminated.

          (f) The Company reserves the right to restrict participation in the
Plan if it believes that such participation may be contrary to the general
intent of the Plan or in violation of applicable law.


Section 4.  Cash Dividend Purchases
- -----------------------------------

          If a participant has elected full or partial dividend reinvestment on
the shares of Common Stock or Preferred Stock registered in such participant's
name or on the shares of Common Stock held under the Plan for such participant,
such

                                       3
<PAGE>
 
cash dividends will be credited to each participant's account under the Plan and
will be automatically reinvested to purchase Common Stock on behalf of the
participants during the applicable Investment Period as described in Section 7.
Until participation in the Plan is terminated pursuant to Section 12 hereof,
Common Stock and/or Preferred Stock participating in the Plan shall include (1)
all shares of each class or series of shares of Common Stock and/or Preferred
Stock, as the case may be, designated by registered holders of such shares in
Shareholder Authorization Forms which have been received by the Company by the
record date for the payment of a cash dividend, including all such shares
purchased after receipt of said form, and all shares received as a result of a
stock dividend or stock split, (2) all shares of Common Stock transferred to the
Administrator (or the Trustee) for safekeeping under the Plan, and (3) all
shares of Common Stock purchased under the Plan for the accounts of shareholders
and non- holder investors, including all shares purchased with reinvested
dividends and optional cash payments, unless said shares have been withdrawn
pursuant to Section 13 hereof and are held in the name of a person who has not
signed a Shareholder Authorization Form.

          In the case of participants whose dividends on Common Stock and/or
Preferred Stock are subject to United States income tax withholding, the amount
of tax to be withheld will be deducted from the amount of dividends on Common
Stock and/or Preferred Stock to determine the amount of dividends to reinvest.

          The Administrator will credit dividends for all shares of Common Stock
and/or Preferred Stock participating in the Plan (other than dividends paid on
shares as to which the participant has elected to receive cash dividends) to the
participants' accounts on the basis of full and fractional shares held in these
accounts and will automatically reinvest such dividends (less any administration
fees and any amounts required to be withheld by United States income tax law) in
additional shares of Common Stock.


Section 5.  Cash Purchases
- --------------------------

          All participants, whether or not they have authorized the reinvestment
of cash dividends on Common Stock or Preferred Stock, shall be eligible to make
optional cash payments for purchases of additional shares of Common Stock under
the Plan.  Optional cash payments shall be made by check or money order in U.S.
Dollars payable to HEI/DRIP (or may be made by electronic funds transfer from a
bank account designated by a participant, by payroll deduction, or by such other
means, in each case subject to approval by the Treasurer of the Company or the

                                       4
<PAGE>
 
Administrator) and any such payment may not be less than $25, nor may such
payments exceed $120,000 in any calendar year (including for purposes of this
limitation the initial payment made by a non-holder investor upon enrollment in
the Plan).  Optional cash payments must be received by the Administrator at
least five (5) days before an Investment Date (as defined below) in order to be
invested on or commencing on that Investment Date.  The Administrator will send
the participant a statement recording receipt and transmittal of the total
optional payments received for the Investment Period.  The Plan will not be
required to accept any checks payable to a party other than HEI/DRIP even if
endorsed for payment to the Plan.

Section 6.  Method of Purchase of Shares
- ----------------------------------------

          The Plan will satisfy its requirements for shares of Common Stock
through purchases from the Company of authorized but unissued shares, through
open market purchases of shares.  Open market purchases under the Plan, if any,
will be made through an independent agent that is a registered "broker-dealer"
or "bank," as such terms are defined in Section 3(a)(6) of the Securities
Exchange Act of 1934 ("Broker").  Neither the Administrator nor the Company, nor
any affiliate thereof, shall exercise any direct or indirect control or
influence over the times when or the prices at which the Broker may purchase the
Company's Common Stock for the Plan, the amounts of shares to be purchased
(other than the aggregate dollar amount acquired by the Plan), the manner in
which the shares are to be purchased, or the selection by the Broker of a broker
or dealer through which purchases may be executed.  The Company shall not change
the method of acquiring shares of Common Stock to satisfy the Plan's
requirements, including any change from purchases from the Company of authorized
but unissued shares of Common Stock to open market purchases, or vice versa,
more than once in any three-month period.  The method of acquiring shares will
be determined only at the direction of the Board of Directors or the Chief
Financial Officer of the Company.  Any change to the method of acquiring shares
must be based on a recorded determination by the Board of Directors or the Chief
Financial Officer of the Company that the Company's need to raise additional
capital has changed, or that there is another valid reason for such change.

          All dividend payments (unless invested in shares of Common Stock
issued by the Company on the dividend payment date) and optional cash payments
will be transmitted to a segregated escrow account or to the Broker: (1) if the
funds are received before noon, by the opening of business on the next business
day following the day of receipt of funds, or

                                       5
<PAGE>
 
(2) if the funds are received at or after noon, by the end of the next business
day following the day of receipt of funds.


Section 7.  Timing of Purchases
- -------------------------------

          Optional cash payments and dividend payments will be invested in
shares of Common Stock on or after the applicable Investment Date.  The
"Investment Dates" for optional cash payments shall be the 15th and 30th days of
each month (except that the Investment Date for February shall be the last day
of the month).  The "Investment Date" for Common Stock dividends and for
Preferred Stock dividends shall be on or within three business days prior to the
applicable dividend payment date.  If any date for investment of dividends or
optional cash payments as stated above is not a business day, the "Investment
Date" shall be the next succeeding business day.

          Interest will not be paid on optional cash payments or on reinvested
dividends prior to or after their investment in Common Stock or if for any
reason such payments and dividends are not invested pursuant to the Plan.

          Shares purchased from the Company shall be purchased on the applicable
Investment Date.  Shares purchased on the open market shall be purchased during
the period (each, an "Investment Period") commencing on each applicable
Investment Date and ending thirty (30) days thereafter; provided, however, that
optional cash payments not invested within 35 days of receipt, and dividend
payments not invested within 30 days of the dividend payment date, shall be
promptly returned, without interest, to the participants.  In addition, funds
that are not invested during the applicable Investment Period will be promptly
returned, without interest, to the participants.

          Shares of Common Stock purchased directly from the Company will be
credited to participants' accounts on the date purchased, except that if any
shares are purchased on the open market, all of the shares purchased during the
applicable Investment Period will be credited to participants' accounts as of
the day of purchase of the last share.  The Broker will be instructed prior to
the commencement of each Investment Period regarding the amount of funds to be
used to purchase shares of Common Stock on the open market during such
Investment Period.

          If the Broker is directed but unable to purchase sufficient shares in
the open market with cash dividends and/or optional payments during any
Investment Period, the Common Stock that is purchased on the open market will be
allocated among participants' accounts (on a pro rata basis if necessary)
according to the amount each participant had contributed in

                                       6
<PAGE>
 
cash dividends and, if there are any shares remaining, on a pro rata basis
according to the amount each participant had contributed in optional cash
payments.  Any remaining funds will be returned to participants on a pro rata
basis.

          If a participant has elected full or partial dividend reinvestment on
the shares of Common Stock or Preferred Stock registered in such participant's
name or on shares of Common Stock held under the Plan for such participant, the
cash dividends to be reinvested for such participant will remain with the
Company if reinvested on the dividend payment date in shares of Common Stock
purchased from the Company or will be delivered by the Company to the escrow
account or the Broker as described in Section 6 concurrently with payment of
cash dividends to nonparticipating shareholders.  Optional cash payments will be
made by participants directly to the Administrator.  The Administrator will
deliver or cause the Company to deliver funds to the escrow account or the
Broker as described in Section 6.


Section 8.  Purchase Price of Shares
- ------------------------------------

          The purchase price per share of Common Stock purchased for the
accounts of participants directly from the Company will be 100% of the average
of the high and low sales prices for the Common Stock on the composite tape for
stocks listed on the New York Stock Exchange on the business day prior to the
applicable Investment Date or such later date as such stock is purchased (or the
last prior day on which the Common Stock is traded if there is no trade reported
on the business day prior to the applicable Investment Date or such later date).
The purchase price per share of Common Stock purchased on the open market will
be the weighted average price per share (adjusted for brokerage fees and
commissions, any service charges and applicable taxes) of the aggregate number
of shares acquired on the open market by the Broker during the applicable
Investment Period.  Amounts to be invested in shares of Common Stock during any
Investment Period will not be pooled with amounts to be invested during another
Investment Period for purposes of computing per share prices.  Amounts to be
invested in any Investment Period will be invested to the extent possible before
any purchases are executed for any subsequent Investment Period.


Section 9.  Registration of Shares
- ----------------------------------

          Shares of Common Stock purchased under the Plan will be registered in
the name of the Administrator (or the Trustee, if there is a Trustee) as agent
for the participants.  Shares

                                       7
<PAGE>
 
will not be issued to participants unless requested pursuant to Section 13
hereof.

          For safekeeping or other purposes, holders of record of Common Stock
who submit Shareholder Authorization Forms may elect to transfer their shares of
Common Stock to the Administrator (or the Trustee, if there is a Trustee),
without charge, to the credit of their account under the Plan, pursuant to such
procedures as the Company and the Administrator shall establish.


Section 10.  Participants' Accounts
- -----------------------------------

          The Administrator shall keep an individual account for each
participant recording the participant's interest in the Plan.  Each
participant's account will be credited with that number of shares, including
fractions computed to four decimal places, equal to the total amount of cash
dividends or optional cash payments to be invested, less administrative fees and
amounts required to be withheld for tax purposes, divided by the applicable
purchase price per share.


Section 11.  Reports to Participants
- ------------------------------------

          Participants who reinvest dividends and/or make optional cash payments
will receive periodic statements of account showing amounts invested, purchase
prices, shares purchased, and/or other relevant information.  In addition, each
participant shall receive copies of the Company's annual report to stockholders,
notices of annual meetings, proxy statements, and information for income tax
reporting purposes.


Section 12.  Termination of Participation
- -----------------------------------------

          A participant may terminate participation in the Plan as to all (but
not less than all) Common Stock and Preferred Stock participating in the Plan at
any time by written notification to the Administrator.  Any notice of
termination received on or after an ex-dividend record date will not be
effective until dividends have been paid, credited to the participant's Plan
account and reinvested in additional shares of Common Stock in accordance with
the Plan.  Within ten business days after the later to occur of (a) the receipt
of notice of termination and (b) reinvestment of dividends as to participants
whose notice of termination is received after an ex-dividend record date,
certificates for whole shares of Common Stock credited to the participant's Plan
account will be issued and a cash payment will be made for any fraction of a

                                       8
<PAGE>
 
share; provided, however, that if a participant's account is credited with less
than five shares, the participant will receive cash in lieu of shares unless the
Company otherwise elects.  Cash payments for any fraction of a share or for less
than five shares will be based on the market price per share (determined in the
manner provided in Section 8 hereof for shares purchased directly from the
Company) on the last business day prior to the date of payment to the
terminating participant.  In no case will certificates for fractional shares be
issued.

          A participant must maintain at least one whole share of Common Stock
in the Plan to keep an active account.  If a participant does not maintain at
least one whole share in the Plan, the participant's participation in the Plan
may be terminated, in which case the participant will receive a cash payment
based on the market price per share (determined in the manner provided in
Section 8 hereof for shares purchased directly from the Company) on the business
day prior to the date of payment to the terminating participant.

          Termination of participation in the Plan will not preclude re-
enrollment, provided that the Company reserves the right to reject re-
enrollment where in its sole discretion it deems there have been excessive
terminations and re-enrollments.

          The term "ex-dividend record date" for purposes of the Plan is three
(3) business days prior to the dividend record date.


Section 13.  Withdrawal of Shares
- ---------------------------------

          A participant may withdraw all or a portion of shares of Common Stock
from the participant's account by notifying the Administrator in writing to that
effect and specifying the whole number of shares to be withdrawn.  Withdrawal of
shares must be in full shares only.  Fractional shares will be liquidated upon
termination of participation as described under Section 12.  Any notice of
withdrawal received on or after an ex-dividend record date will not be effective
until dividends have been paid, credited to the participant's Plan account and
reinvested in additional shares of Common Stock in accordance with the Plan.
Within ten business days after the later to occur of (a) receipt of notice of
withdrawal and (b) reinvestment of dividends as to participants whose notice of
withdrawal is received on or after an ex-dividend record date, certificates for
whole shares of Common Stock so withdrawn will be issued.  In no case will
certificates for fractional shares be issued.

                                       9
<PAGE>
 
          Shares withdrawn from the Plan and registered in the participant's
name will continue to participate in the Plan if the participant has so
instructed the Administrator pursuant to a Shareholder Authorization Form and
has not terminated participation pursuant to Section 12 hereof.

          Accounts are maintained in the names used by participants at the time
they entered the Plan.  However, a participant who wishes to withdraw shares and
have the stock certificates issued in the name of another person may do so by
submitting a properly completed and executed stock power, with a Medallion
signature guarantee, and complying with such other procedures as the Company or
Administrator shall establish.


Section 14.  Sale and Transfer of Shares
- ----------------------------------------

          Unless the participant satisfies the requirements specified in Section
13 for the issuance of certificates in the name of another person, shares of
Common Stock credited to a participant's account under the Plan or otherwise
registered in the Administrator's (or Trustee's) name may not be pledged,
encumbered, sold or otherwise transferred by a participant.  Absent satisfaction
of said requirements, a participant wishing to sell, pledge, encumber or
otherwise dispose of shares must have those shares registered in his name by
terminating participation in the Plan pursuant to Section 12 or withdrawing the
shares pursuant to Section 13.

          A participant who wishes to receive cash in lieu of shares of Common
Stock upon termination of participation or withdrawal of shares may request the
Administrator to sell such shares and to deliver the net proceeds to the
participant.  The net proceeds shall equal the selling price of the shares less
the brokerage fees and commissions, any withholding required under applicable
tax laws and a fee of $15 for the handling of each such request.


Section 15.  Voting of Shares
- -----------------------------

          Each participant will be sent a notice of meeting and proxy statement
and form of proxy for each meeting of shareholders of the Company.  Each
participant will vote directly the shares registered in such participant's name.
The Administrator (or the Trustee, as the case may be) shall be deemed
instructed to vote the shares of Common Stock it holds in the Plan for a
participant who has shares registered in such participant's own name in the same
way that said participant votes the shares of Common Stock registered in the
participant's name, unless the participant instructs that the shares held in

                                       10
<PAGE>
 
the Plan are to be voted in another way, in which event said shares shall be
voted as instructed.  If no shares of Common Stock are registered in a
participant's name, the Administrator (or the Trustee, as the case may be) shall
vote the shares it holds in the Plan for the participant in accordance with
instructions of the participant given on the proxy form duly signed and returned
by the participant.  In the absence of any of the foregoing types of
instructions, the Administrator (or the Trustee, as the case may be) will vote
the shares registered in its name in the same proportion on each issue as it
votes those shares as to which it has received instructions.


Section 16.  Limitation of Liability
- ------------------------------------

          Neither the Company nor the Administrator nor the Trustee nor the
Broker nor any of their respective officers, directors, representatives,
employees or agents shall be liable for any damages resulting from any act or
omission in connection with the Plan in the absence of bad faith or gross
negligence.


Section 17.  Common Stock Adjustment Provisions
- -----------------------------------------------

          If the outstanding shares of common stock of the Company are decreased
or exchanged for a different number or kind of shares or other securities, or if
additional shares or new or different shares or other securities are distributed
with respect to such shares of common stock or other securities, through merger,
consolidation, sale of all or substantially all of the property of the Company,
recapitalization, reclassification, stock dividend, stock split, reverse stock
split or other distribution with respect to such shares of common stock or other
securities, an appropriate and proportionate adjustment may, subject to the
requirements of federal and state securities laws and regulations, be made by
the Company to the maximum number and kind of shares of common stock or other
securities issuable under the Plan which are subject to an effective
registration statement filed with the Securities Exchange Commission pursuant to
the Securities Act of 1933, as amended.


Section 18.  Other Matters
- --------------------------

          The Board of Directors, Chief Financial Officer or Treasurer of the
Company shall determine the effective date of the Plan as most recently amended
hereby.

                                       11
<PAGE>
 
          The Company intends to continue the Plan indefinitely, but reserves
the right to suspend or terminate the Plan at any time.  The Company also
reserves the right to make any additions or modifications to the Plan.  The
Treasurer of the Company may interpret the Plan and may make additions thereto
which are not inconsistent with the above provisions of the Plan.

          In the event any stock dividends or split shares are distributed by
the Company on shares of Common Stock credited to the account of a participant
under the Plan, such shares will be added to the participant's account.  Stock
dividends or split shares distributed on any shares of Common Stock registered
in the name of a participant will be distributed to the participant in the same
manner as to shareholders who are not participating in the Plan.

          In the event that the number of shares of Common Stock to be purchased
by the participants in the Plan exceeds the balance of the shares authorized by
the Board of Directors to be sold pursuant to the Plan, then the Plan shall be
automatically suspended with respect to future purchases until such time as the
Board of Directors of the Company has authorized additional shares of Common
Stock to be sold pursuant to the Plan.  In the event of any such automatic
suspension of the Plan, then (1) on the date of such automatic suspension of the
Plan, the number of shares of Common Stock to be sold shall be prorated among
the participants purchasing shares on such date, and (2) the Treasurer of the
Company shall determine the date the suspension is to be lifted after the Board
of Directors has authorized the sale of additional shares of Common Stock
pursuant to the Plan.

          The Company will notify each participant of the commencement of any
tender offer for securities which include the Company's Common Stock held in
participants' accounts.  The Company will use its best efforts to distribute to
participants in a timely manner the same information that is distributed to all
of the Company's shareholders in connection with the tender offer.  After
consulting with the Trustee, the Company will provide a means by which
participants may direct the Trustee whether or not to tender the Company's
Common Stock credited to their accounts.  The Trustee will not tender shares
held in any participant's account for which it receives no direction from the
participant.  A participant may, at any time prior to a tender offer withdrawal
date, direct the Trustee to withdraw shares of the Company's Common Stock
previously directed by the participant to be tendered.

                                       12
<PAGE>
 
          The Company or the Administrator shall provide participants with
prompt notice of any modification, suspension or termination of the Plan.

          Certificates for whole shares issued to a participant upon termination
of participation in the Plan pursuant to Section 12, or upon withdrawal of
shares pursuant to Section 13, or upon termination of the Plan by the Company,
shall be registered in the names used by participants at the time they enrolled
in the Plan, except as otherwise provided pursuant to Section 13.

          The Hawaiian Electric Industries Retirement Savings Plan and any other
plans of the Company or its direct or indirect subsidiaries may participate in
the Plan on such terms and in such manner as may be determined by the Treasurer
of the Company.

                                       13

<PAGE>
 
                                                                HEI Exhibit 99.2
                                                                ----------------



                  EIGHTH AMENDMENT TO TRUST AGREEMENT BETWEEN
                     FIDELITY MANAGEMENT TRUST COMPANY AND
                       HAWAIIAN ELECTRIC INDUSTRIES, INC.

     THIS EIGHTH AMENDMENT TO TRUST AGREEMENT, is made and entered into
February 27, 1998, by and between Fidelity Management Trust Company (the
"Trustee") and Hawaiian Electric Industries, Inc. (the "Sponsor");

                                  WITNESSETH:

     WHEREAS, the Trustee and the Sponsor heretofore entered into a Trust
Agreement dated November 28, 1988, and amended December 22, 1989, January 1,
1994, March 15, 1994, February 1, 1996, April 1, 1996, April 1, 1997 and June
13, 1997 (the "Trust Agreement") for the Hawaiian Electric Industries Retirement
Savings Plan (the "Plan"); and

     WHEREAS, the Trustee and the Sponsor wish to further amend said Trust
Agreement as provided in Section 13 thereunder; and

     WHEREAS, on February 27, 1998, the Sponsor wishes to add as an investment
option under the Plan, the Fidelity U.S. Bond Index Fund; and

     WHEREAS, on July 1, 1998, the Sponsor wishes to remove as an investment
option under the Plan, the Fidelity International Bond Fund; and

     WHEREAS, the Sponsor now desires, and hereby directs the Trustee, in
accordance with Sections 4(b) and 7(c), to liquidate all participant balances
held in Fidelity International Bond Fund on July 1, 1998, and to invest the
proceeds in the ASB Money Market Account until such time as the affected
participants direct that the proceeds be invested in other investment options
offered under the Plan.  The parties hereto agree that the Trustee shall have no
discretionary authority with respect to this sale and transfer directed by the
Sponsor.  Any variation from the procedure described herein may be instituted
only at the express written direction of the Sponsor; and

     NOW THEREFORE, in consideration of the above premises the Trustee and the
Sponsor hereby amend the Trust Agreement by:

     (1)  Amending and restating Schedules "A" and "C" as attached.
 
     IN WITNESS WHEREOF, the Trustee and the Sponsor have caused this Eighth
Amendment to be executed by their duly authorized officers effective as of the
day and year first above written.

HAWAIIAN ELECTRIC INDUSTRIES, INC.    FIDELITY MANAGEMENT TRUST
BY:  HAWAIIAN ELECTRIC INDUSTRIES,    COMPANY
INC. PENSION INVESTMENT COMMITTEE
 

By /s/ Robert F. Mougeot  2/23/98    By /s/ Cheryl L. Gladstone  3/4/98
   ---------------------  -------       -----------------------  ------
  Robert F. Mougeot       Date          Vice President           Date
  Chairman


By /s/ Constance H. Lau  2/20/98
   --------------------  -------
  Constance H. Lau        Date
  Secretary and Member
<PAGE>
 
                                  SCHEDULE "A"
                                        
                            ADMINISTRATIVE SERVICES
                            -----------------------

Administration
- --------------

     * Establishment and maintenance of Participant account and election
percentages.

     * Maintenance of the following plan investment options:

            - Fidelity Retirement Money Market Portfolio                    
            - ASB Money Market Account                                      
            - HEI Common Stock Fund                                         
            - Fidelity Puritan Fund                                         
            - Fidelity Magellan Fund                                        
            - Fidelity Overseas Fund                                        
            - Fidelity International Bond Fund (formerly known as Fidelity 
              Global Bond Fund)(to 6/30/98)                       
            - Fidelity Freedom 2000 Fund                                   
            - Fidelity Freedom 2010 Fund                          
            - Fidelity Freedom 2020 Fund                          
            - Fidelity Freedom 2030 Fund                          
            - Fidelity Freedom Income Fund                        
            - Spartan U.S. Equity Index Fund (formerly known as Fidelity U.S.
              Equity Index Portfolio)                                        
            - MAS Value Portfolio                                            
            - Neuberger & Berman Partners Trust                              
            - PBHG Emerging Growth Fund                                      
            - Fidelity U.S. Bond Index Fund                                  

     * Maintenance of the following money classifications:

            - Salary Reduction                
            - Participant Voluntary           
            - Rollover                        
            - HEI Diversified Plan            
            - Employer ASB                    
            - Employer Supplemental           
            - IRA                             
            - Voluntary HEISOP                
            - Employer HEISOP                  

     * Processing of investment option trades.

     The Trustee will provide only the recordkeeping and administrative services
set forth on this Schedule "A" and no others.

                                       2
<PAGE>
 
Processing
- ----------

     * Weekly processing of contribution data and contributions
     * Processing of transfers and changes of future allocations via the
       telephone exchange system
     * Daily processing of withdrawals

 
Other
- -----

     * Monthly trial balance
     * Quarterly administrative reports
     * Quarterly participant statements
     * 1099Rs and W-2Ps
     * Participant Loans
     * Periodic meetings with Sponsor
     * Educational services as needed and mutually agreed upon by the Trustee
       and the Sponsor.


HAWAIIAN ELECTRIC INDUSTRIES, INC.      FIDELITY MANAGEMENT TRUST
BY:  HAWAIIAN ELECTRIC INDUSTRIES,      COMPANY
INC. PENSION INVESTMENT COMMITTEE
 
 
By /s/ Robert F. Mougeot      2/23/98   By /s/ Cheryl L. Gladstone   3/4/98
   ---------------------      -------   --------------------------   ------
     Robert F. Mougeot        Date      Vice President               Date
     Chairman
 
By /s/ Constance H. Lau       2/20/98
   ---------------------      -------
     Constance H. Lau         Date
     Secretary and Member

                                       3
<PAGE>
 
                                  SCHEDULE "C"
                                        
                               INVESTMENT OPTIONS
                               ------------------


     In accordance with Section 4(b), the Named Fiduciary hereby directs the
Trustee that participants' individual accounts may be invested in the following
investment options:

     - Fidelity Retirement Money Market Portfolio
     - ASB Money Market Account
     - HEI Common Stock Fund
     - Fidelity Puritan Fund
     - Fidelity Magellan Fund
     - Fidelity Overseas Fund
     - Fidelity International Bond Fund (formerly known as Fidelity Global Bond
       Fund) (to 6/30/98)
     - Fidelity Freedom 2000 Fund
     - Fidelity Freedom 2010 Fund
     - Fidelity Freedom 2020 Fund
     - Fidelity Freedom 2030 Fund
     - Fidelity Freedom Income Fund
     - Spartan U.S. Equity Index Fund (formerly known as Fidelity U.S.
       Equity Index Portfolio)
     - MAS Value Portfolio
     - Neuberger & Berman Partners Trust
     - PBHG Emerging Growth Fund
     - Fidelity U.S. Bond Index Fund

     The investment option referred to in Section 4(c) and Section 4(d)(v)(B)(5)
shall be the ASB Money Market Account.

 
HAWAIIAN ELECTRIC INDUSTRIES, INC.
BY:  HAWAIIAN ELECTRIC INDUSTRIES,
INC. PENSION INVESTMENT COMMITTEE
 

By /s/ Robert F. Mougeot  2/23/98
   ---------------------  -------
  Robert F. Mougeot       Date
  Chairman

By /s/ Constance H. Lau  2/20/98
   --------------------  -------
  Constance H. Lau       Date
  Secretary and Member

                                       4


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