PUBLIC SERVICE CO OF COLORADO
10-Q, 1997-05-14
ELECTRIC & OTHER SERVICES COMBINED
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                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549
                                  FORM 10-Q

       [X] QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                       SECURITIES EXCHANGE ACT OF 1934
                For the quarterly period ended March 31, 1997
                                      OR
         [ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                        SECURITIES EXCHANGE ACT OF 1934
     For the transition period from ________________ to ________________
                        Commission file number 1-3280



                      Public Service Company of Colorado
            (Exact name of registrant as specified in its charter)



              Colorado                                 84-0296600
   (State or other jurisdiction of                    (IRS Employer
   incorporation or organization)                  Identification No.)

 1225 17th Street, Denver, Colorado                       80202
(Address of principal executive offices)               (Zip Code)




Registrant's Telephone Number, including area code: (303) 571-7511


                 --------------------------------------------


      Indicate by check mark  whether the  registrant  (1) has filed all reports
required to be filed by Section 13 or 15(d) of the  Securities  Exchange  Act of
1934  during  the  preceding  12 months  (or for such  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

      At May 9, 1997,  65,433,203 shares of the registrant's Common Stock, $5.00
par value (the only class of common stock), were outstanding.



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<PAGE>

                              Table of Contents

                        PART I - FINANCIAL INFORMATION

Item l.Financial Statements ...............................................  1

Item 2.Management's Discussion and Analysis of Financial Condition
          and Results of Operations ....................................... 15


                          PART II - OTHER INFORMATION


Item 1.  Legal Proceedings................................................. 19

Item 6.  Exhibits and Reports on Form 8-K.................................. 19

SIGNATURE.................................................................. 20

EXHIBIT INDEX.............................................................. 21

EXHIBIT 12(a).............................................................. 22

EXHIBIT 12(b).............................................................. 23

EXHIBIT 15 ................................................................ 24















   In addition  to the  historical  information  contained  herein,  this report
contains a number of  "forward-looking  statements",  within the  meaning of the
Securities  Exchange Act of 1934.  Such  statements  address  future  events and
conditions concerning capital expenditures, resolution and impact of litigation,
regulatory  matters,  liquidity and capital resources,  and accounting  matters.
Actual results in each case could differ materially from those projected in such
statements  due  to  a  variety  of  factors  including,   without   limitation,
restructuring  of the utility  industry;  future economic  conditions;  earnings
retention  and  dividend  payout  policies;  developments  in  the  legislative,
regulatory and competitive environments in which the Company operates; and other
circumstances  that  could  affect  anticipated  revenues  and  costs,  such  as
compliance with laws and  regulations.  These and other factors are discussed in
the Company's filings with the Securities and Exchange Commission including this
report.


                                       i
<PAGE>


                        PART 1 - FINANCIAL INFORMATION

Item 1. Financial Statements

                      PUBLIC SERVICE COMPANY OF COLORADO
                               AND SUBSIDIARIES
                    CONSOLIDATED CONDENSED BALANCE SHEETS
                            (Thousands of Dollars)

                                    ASSETS

                                                         March 31,  December 31,
                                                           1997        1996
                                                           ----        ----
                                                        (Unaudited)

Property, plant and equipment, at cost:
   Electric ..........................................  $4,012,454   $3,931,413
   Gas................................................   1,067,579    1,035,394
   Steam and other....................................      78,376       78,225
   Common to all departments..........................     429,123      418,262
   Construction in progress...........................     108,101      181,597
                                                           -------      -------
                                                         5,695,633    5,644,891
   Less: accumulated depreciation ....................   2,079,254    2,045,996
                                                         ---------    ---------
     Total property, plant and equipment..............   3,616,379    3,598,895
                                                         ---------    ---------


Investments, at cost, and receivables.................      43,058       46,550
                                                           -------      -------

Current assets:
   Cash and temporary cash investments (Note 5).......     368,418        9,406
   Accounts receivable, less reserve for uncollectible
     accounts ($3,434 at March 31, 1997; 
     $4,049 at December 31, 1996) ....................     203,604      218,132
   Accrued unbilled revenues .........................      69,992       85,894
   Recoverable purchased gas and electric energy costs
     - net (Note 1) ..................................      63,365       31,288
   Materials and supplies, at average cost............      47,419       48,972
   Fuel inventory, at average cost....................      24,572       24,739
   Gas in underground storage, at cost (LIFO).........      19,954       42,826
   Regulatory assets recoverable within one year(Note 1)    44,020       44,110
   Prepaid expenses and other.........................      40,375       41,790
                                                            -------     -------
    Total current assets..............................     881,719      547,157
                                                           -------      -------

Deferred charges:
   Regulatory assets (Note 1).........................     291,764      304,456
   Unamortized debt expense ..........................      11,908       10,975
   Other..............................................      68,152       64,615
                                                           -------      -------
    Total deferred charges............................     371,824      380,046
                                                           -------      -------
                                                        $4,912,980   $4,572,648
                                                        ==========   ==========



      The accompanying notes to consolidated condensed financial statements
               are an integral part of these financial statements.




                                       1
<PAGE>


                      PUBLIC SERVICE COMPANY OF COLORADO
                               AND SUBSIDIARIES
                    CONSOLIDATED CONDENSED BALANCE SHEETS
                            (Thousands of Dollars)

                           CAPITAL AND LIABILITIES

                                                         March 31,  December 31,
                                                           1997        1996
                                                           ----        ----
                                                        (Unaudited)


Common stock..........................................  $1,065,872   $1,048,447
Retained earnings.....................................     415,513      389,841
                                                          --------      -------
    Total common equity...............................   1,481,385    1,438,288

Preferred stock:
   Not subject to mandatory redemption................     140,008      140,008
   Subject to mandatory redemption at par.............      39,913       39,913
Long-term debt........................................   1,482,816    1,259,528
                                                         ---------    ---------
                                                         3,144,122    2,877,737
                                                         ---------    ---------

Noncurrent liabilities:
   Employees' postretirement benefits other than pensions   55,940       55,677
   Employees' postemployment benefits.................      25,182       25,182
                                                            ------       ------
    Total noncurrent liabilities......................      81,122       80,859
                                                            ------       ------

Current liabilities:
   Notes payable and commercial paper ................     295,400      244,725
   Long-term debt due within one year.................     255,076      155,030
   Preferred stock subject to mandatory redemption 
     within one year .................................       2,576        2,576
   Accounts payable...................................     154,394      254,256
   Dividends payable..................................      37,210       36,973
   Customers' deposits................................      22,286       21,441
   Accrued taxes......................................      85,675       58,990
   Accrued interest...................................      27,885       33,797
   Defueling and decommissioning liability............       7,913        8,665
   Current portion of accumulated deferred income taxes     21,280        4,560
   Other..............................................      53,935       69,203
                                                            ------       ------
    Total current liabilities.........................     963,630      890,216
                                                           -------      -------

Deferred credits:
   Customers' advances for construction...............      47,013       50,269
   Unamortized investment tax credits ................     104,676      105,928
   Accumulated deferred income taxes  ................     542,372      539,082
   Other..............................................      30,045       28,557
                                                            ------       ------
    Total deferred credits............................     724,106      723,836
                                                           -------      -------

Commitments and contingencies (Notes 4 and 5).........    --------     --------
                                                        $4,912,980   $4,572,648
                                                        ==========   ==========



      The accompanying notes to consolidated condensed financial statements
               are an integral part of these financial statements.




                                       2
<PAGE>


                      PUBLIC SERVICE COMPANY OF COLORADO
                                 AND SUBSIDIARIES
                    CONSOLIDATED CONDENSED STATEMENTS OF INCOME
                                    (Unaudited)
                   (Thousands of Dollars Except per Share Data)


                                                            Three Months Ended
                                                                March 31,
                                                            1997          1996
                                                            ----          ----

Operating revenues:
   Electric..........................................    $373,953      $370,117
   Gas...............................................     291,825       242,228
   Other.............................................      11,882        10,572
                                                           ------        ------
                                                          677,660       622,917
Operating expenses:
   Fuel used in generation...........................      44,261        46,337
   Purchased power...................................     122,626       122,435
   Gas purchased for resale..........................     207,352       160,724
   Other operating expenses..........................      82,828        73,890
   Maintenance.......................................      15,113        14,372
   Depreciation and amortization.....................      42,857        36,862
   Taxes (other than income taxes)...................      22,488        22,305
   Income taxes......................................      35,317        41,146
                                                         --------       -------
                                                          572,842       518,071
Operating income.....................................     104,818       104,846

Other income and deductions:
   Allowance for equity funds used during construction          -           511
   Miscellaneous income and deductions - net (Note 1)        (889)       (5,284)
                                                             ----        ------
                                                             (889)       (4,773)
Interest charges:
   Interest on long-term debt........................      26,906        22,068
   Amortization of debt discount and expense less premium     928           977
   Other interest....................................      14,675        13,671
   Allowance for borrowed funds used during construction   (1,461)       (1,072)
                                                           ------        ------ 
                                                           41,048        35,644
Net income...........................................      62,881        64,429
Dividend requirements on preferred stock.............       2,943         2,972
                                                            -----         -----
Earnings available for common stock..................    $ 59,938      $ 61,457
                                                         ========      ========
Weighted average common shares outstanding (thousands)     65,122        63,679
                                                           ======        ======

Earnings per weighted average
   share of common stock outstanding.................    $   0.92      $   0.97
                                                         ========      ========

Dividends per share declared on common stock.........    $  0.525      $  0.525
                                                         ========      ========


      The accompanying notes to consolidated condensed financial statements
               are an integral part of these financial statements.




                                       3
<PAGE>


                      PUBLIC SERVICE COMPANY OF COLORADO
                                 AND SUBSIDIARIES
                  CONSOLIDATED CONDENSED STATEMENTS OF CASH FLOWS
                                    (Unaudited)
                              (Thousands of Dollars)

                                                             Three Months Ended
                                                                  March 31,
                                                               1997      1996
                                                               ----      ----

Operating activities:
   Net income........................................      $  62,881  $  64,429
   Adjustments to reconcile net income to net
   cash provided by operating activities:
    Depreciation and amortization....................         43,932     38,103
    Amortization of investment tax credits...........         (1,252)    (1,241)
    Deferred income taxes............................         23,609      9,117
    Allowance for equity funds used during construction            -       (511)
    Change in accounts receivable....................         14,528    (30,019)
    Change in inventories............................         24,592     28,845
    Change in other current assets...................        (15,659)    14,149
    Change in accounts payable.......................        (99,862)   (15,532)
    Change in other current liabilities..............         15,366     35,537
    Change in deferred amounts.......................             85     (1,158)
    Change in noncurrent liabilities.................            264    (19,819)
    Other............................................           (296)     1,396
                                                             -------      -----
       Net cash provided by operating activities.....         68,188    123,296
                                                             -------    -------

Investing activities:
   Construction expenditures.........................        (57,545)   (62,616)
   Allowance for equity funds used during construction             -        511
   Proceeds from disposition of property, plant 
     and equipment ..................................          1,244        734
   Purchase of other investments.....................           (418)    (1,316)
   Sale of other investments.........................          4,205      2,034
                                                               -----     -----
       Net cash used in investing activities.........        (52,514)   (60,653)
                                                             -------    -------

Financing activities:
   Proceeds from sale of common stock................          7,658      7,317
   Proceeds from sale of long-term debt (Note 5).....        323,733          -
   Redemption of long-term debt......................         (1,755)   (16,698)
   Short-term borrowings - net.......................         50,675    (20,130)
   Dividends on common stock.........................        (34,030)   (32,313)
   Dividends on preferred stock......................         (2,943)    (2,972)
                                                              ------    -------
       Net cash provided by (used in) financing
         activities .................................        343,338    (64,796)
                                                             -------    ------- 
       Net increase (decrease) in cash and temporary
         cash investments ...........................        359,012     (2,153)
       Cash and temporary cash investments at
         beginning of period ........................          9,406     14,693
       Cash and temporary cash investments at end of
         period .....................................     $  368,418  $  12,540


      The accompanying notes to consolidated condensed financial statements
               are an integral part of these financial statements.





                                       4
<PAGE>


                      PUBLIC SERVICE COMPANY OF COLORADO
                               AND SUBSIDIARIES

             NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS
                                 (Unaudited)

1. Accounting Policies

Business, Utility Operations and Regulation

      The Company is an operating  public  utility  engaged,  together  with its
utility  subsidiaries,  principally in the generation,  purchase,  transmission,
distribution  and  sale  of  electricity  and  in  the  purchase,  transmission,
distribution,  sale and transportation of natural gas. The Company is subject to
the  jurisdiction  of The Public  Utilities  Commission of the State of Colorado
("CPUC") with respect to its retail  electric and gas operations and the Federal
Energy  Regulatory  Commission  ("FERC") with respect to its wholesale  electric
operations  and  accounting  policies and  practices.  Approximately  90% of the
Company's electric and gas revenues are subject to CPUC  jurisdiction.  Cheyenne
Light, Fuel and Power Company ("Cheyenne") is subject to the jurisdiction of the
Public Service Commission of Wyoming ("WPSC"). WestGas Interstate,  Inc. ("WGI")
and Texas-Ohio  Pipeline,  Inc. are subject to the jurisdiction of the FERC. The
gas  marketing,  power  brokering  and other  operations  of e prime,  inc.  and
Texas-Ohio Gas, Inc. (acquired September 1, 1996) are not regulated. The Company
also  intends to invest in  electricity  systems  outside  the United  States as
discussed in Note 5. The Company's international  investments will be subject to
regulation in the countries in which such investments are made.

      Regulatory Assets and Liabilities

      The  Company  and  its  regulated  subsidiaries  prepare  their  financial
statements  in  accordance   with  the  provisions  of  Statement  of  Financial
Accounting  Standards No. 71 -  "Accounting  for the Effects of Certain Types of
Regulation"  ("SFAS 71").  SFAS 71 recognizes that accounting for rate regulated
enterprises should reflect the relationship of costs and revenues  introduced by
rate  regulation.  A  regulated  utility  may  defer  recognition  of a cost  (a
regulatory  asset) or recognize an obligation (a regulatory  liability) if it is
probable that,  through the ratemaking  process,  there will be a  corresponding
increase or  decrease  in  revenues.  On January 1, 1996,  the  Company  adopted
Statement  of  Financial  Accounting  Standards  No.  121  "Accounting  for  the
Impairment of Long-Lived  Assets and Long-Lived  Assets to be Disposed Of" which
imposes stricter criteria for the continued  recognition of regulatory assets on
the balance sheet by requiring  that such assets be probable of future  recovery
at each  balance  sheet  date.  The  adoption of this  statement  did not have a
material impact on the Company's  results of operations,  financial  position or
cash flows.  The  following  regulatory  assets are  reflected in the  Company's
consolidated condensed balance sheets:



                                       5
<PAGE>

             NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS
                                 (Continued)


                                               March 31,  December 31, Recovery
                                                 1997        1996       Through
                                                 ----        ----       -------
                                               (Thousands of Dollars)

Nuclear decommissioning costs, net (Note 2)    $ 81,474    $ 89,731       2005
Income taxes .............................       94,756      98,355       2006
Employees' postretirement benefits 
  other than pensions.....................       55,836      54,449       2013
Early retirement costs....................       13,290      15,505       1998
Employees' postemployment benefits........       24,700      24,797 Undetermined
Demand-side management costs..............       42,416      41,462       2002
Unamortized debt reacquisition costs......       19,408      19,914       2024
Other.....................................        3,904       4,353       1999
                                                  -----       -----
  Total...................................      335,784     348,566
Classified as current.....................       44,020      44,110
                                                 ------      ------
Classified as noncurrent..................     $291,764    $304,456
                                               ========    ========

      The regulatory assets of the Company and its regulated  subsidiaries as of
March 31, 1997,  are reflected in rates  charged to customers  over the recovery
periods noted above. The Company believes it will continue to be subject to rate
regulation to the extent necessary to recover these assets.  In the event that a
portion of the Company's  operations is no longer  subject to the  provisions of
SFAS 71 as a result of a change in regulation or the effects of competition, the
Company could be required to write-off related regulatory assets,  determine any
impairment  to other assets  resulting  from  deregulation  and  write-down  any
impaired assets to their estimated fair value.

      On January 27, 1997,  the CPUC issued its order on the Company's  1996 gas
rate case. The CPUC allowed recovery of postemployment  benefit costs associated
with its gas  operations  on an  accrual  basis  under  Statement  of  Financial
Accounting  Standards  No.  112  -  "Employers'  Accounting  for  Postemployment
Benefits" ("SFAS 112") and denied amortization of the approximately $8.7 million
regulatory  asset  recognized upon the adoption of SFAS 112. The Company intends
to appeal the decision related to this issue and is assessing the impact of this
decision  on the  future  recovery  of the  electric  jurisdictional  portion of
postemployment  benefit costs totaling  approximately $13.8 million. The Company
believes that it will be successful on appeal and that the associated regulatory
asset is  realizable.  If the  appeal is  unsuccessful,  these  amounts  will be
written off.

      Recovered/Recoverable Purchased Gas and Electric Energy Costs - Net

      The Company's and Cheyenne's  tariffs contain clauses which allow recovery
of certain  purchased  gas and  electric  energy costs in excess of the level of
such costs included in base rates. Currently,  these cost adjustment tariffs are
revised periodically,  as prescribed by the appropriate regulatory agencies, for
any  difference  between the total  amount  collected  under the clauses and the
recoverable costs incurred.  The cumulative  effects are recognized as a current
asset or  liability  until  adjusted by refunds or  collections  through  future
billings  to  customers.  The CPUC order  related to the  Company's  merger rate
filing modified and replaced the Company's  Energy Cost Adjustment  ("ECA") with
an Incentive  Cost  Adjustment  ("ICA"),  which allows for a 50%/50%  sharing of
certain  fuel and  energy  cost  increases  or  decreases  among  customers  and
shareholders. As of March 31, 1997, the change did not impact cost recoveries.

      Other Property

      Property,  plant and equipment  includes  approximately  $18.4 million and
$25.4 million, respectively, for costs associated with the engineering design of
a planned future Pawnee 2 generating station and certain water 


                                       6
<PAGE>
             NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS
                                 (Continued)


rights  located  in  southeastern  Colorado,  also  obtained  for a  future 
generating  station.  The Company is earning a return on these investments based
on the Company's weighted average cost of debt and preferred stock in accordance
with a CPUC rate order.

      Miscellaneous Income and Deductions - net

      Miscellaneous  income  and  deductions  - net  includes  items  which  are
non-operating  in nature or, in general,  are not  considered in the  ratemaking
process. Such items include,  among other things, Merger related costs (see Note
3),  contributions,  gains  and  losses  on the  sale of  property  and  certain
litigation,  severance and other accruals.  Individually,  these amounts did not
have a material impact on the Company's results of operations.

Statements of Cash Flows - Non-cash Transactions

      Shares of common  stock  (250,058 in 1997 and 274,934 in 1996),  valued at
the market  price on date of  issuance  (approximately  $10  million in 1997 and
1996), were issued to the Employees'  Savings and Stock Ownership Plan of Public
Service  Company  of  Colorado  and  Participating   Subsidiary  Companies.  The
estimated issuance values were recognized in other operating expenses during the
respective  preceding years.  Shares of common stock (6,470 in 1996),  valued at
the market price on the date of issuance ($0.2 million in 1996),  were issued to
certain  executives  pursuant  to the  applicable  provisions  of the  executive
compensation plans.

      The stock issuances  referenced above were non-cash  financing  activities
and are not reflected in the consolidated condensed statements of cash flows.

General

      See  Note 1. of the  Notes to  Consolidated  Financial  Statements  in the
Company's  1996  Annual  Report  on Form  10-K for a  summary  of the  Company's
significant   accounting   policies.   Certain  prior  year  amounts  have  been
reclassified to conform to the current year's presentation.

2.  Fort St. Vrain

      In 1989, the Company  announced its decision to end nuclear  operations at
the Fort St. Vrain Nuclear  Generating Station ("Fort St. Vrain") and to proceed
with the defueling and  decommissioning  of the reactor.  While the defueling of
the  reactor  to the  Independent  Spent Fuel  Storage  Facility  ("ISFSI")  was
completed in June 1992, several issues related to the ultimate  storage/disposal
of Fort St. Vrain's spent nuclear fuel remained unresolved.

      On February 9, 1996,  the Company  and the  Department  of Energy  ("DOE")
entered into an agreement  resolving all the defueling  issues.  As part of this
agreement,  the Company has agreed to the following: 1) the DOE assumed title to
the fuel  currently  stored in the ISFSI,  2) the DOE will  assume  title to the
ISFSI and will be responsible for the future  defueling and  decommissioning  of
the  facility,  3) the  DOE  agreed  to pay  the  Company  $16  million  for the
settlement  of  claims  associated  with  the  ISFSI,  4)  ISFSI  operating  and
maintenance costs,  including licensing fees and other regulatory costs, will be
the responsibility of the DOE, and 5) the Company provided to the DOE a full and
complete  release of claims against the DOE resolving all  contractual  disputes
related to  storage/disposal  of Fort St. Vrain spent  nuclear fuel. On December
17,  1996,  the DOE  submitted  a request to the Nuclear  Regulatory  Commission
("NRC") to transfer the title of the ISFSI.  This  request is being  reviewed by
the NRC and the Company anticipates approval in mid-1997.

      On  March  22,  1996,  the  Company  and the  decommissioning  contractors
announced that the physical decommissioning activities at the facility have been
completed.  The final site survey was completed in late October  1996.  NRC site
release  activities are continuing.  The Company  requested the NRC to terminate
the Part 50 license and 



                                       7
<PAGE>

             NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS
                                 (Continued)

it is  anticipated  that the license will be terminated  by mid-1997.  Under the
Price-Anderson Act, the Company remains subject to potential  assessments levied
in response to any nuclear  incidents  prior to early 1994,  as disclosed in the
Company's  1996 Annual Report on Form 10-K. At March 31, 1997, a remaining  $7.9
million   defueling   and   decommissioning   liability  was  reflected  on  the
consolidated  condensed  balance  sheet.  The Company  believes  this  remaining
decommissioning  liability  is adequate to  complete  all final  decommissioning
activities.

      As a result  of the DOE  settlement,  coupled  with a  complete  review of
expected  remaining  decommissioning  costs and establishment of the anticipated
refund  to  customers,  pre-tax  earnings  for the  first  quarter  of 1996 were
positively  impacted by approximately  $16 million.  In accordance with the 1991
CPUC approval to recover certain  decommissioning costs, 50% of any cash amounts
received  from the DOE as part of a  settlement,  net of costs  incurred  by the
Company,  including legal fees, is to be refunded or credited to customers.  The
Company established an $8 million refund liability in the first quarter of 1996.
In early 1997, such obligation was reduced by  approximately  $1.1 million after
amounts to be refunded were finally  determined  and approved by the CPUC.  Such
amounts will be refunded over a three year period.

3.  Merger

      In August 1995, the Company,  Southwestern Public Service Company ("SPS"),
a New Mexico  corporation,  and New Century Energies,  Inc. ("NCE"),  a Delaware
corporation,  entered  into an  Agreement  and Plan of  Reorganization  ("Merger
Agreement")  providing for a business  combination  as peer firms  involving the
Company and SPS in a "merger of equals" transaction (the "Merger"). Based on the
outstanding  common stock of the Company and SPS at March 31,  1997,  the Merger
would result in the common  shareholders of the Company owning 63% of the common
equity of NCE and the common shareholders of SPS owning 37% of the common equity
of NCE.

      All required State and Federal regulatory agency  authorizations have been
received,  except for the approval by the  Securities  and  Exchange  Commission
("SEC").  The Company expects that the SEC will make its ruling on the Merger in
the very near term.  It is currently  expected that the Merger will be completed
in the second quarter of 1997.

      It is management's intention that NCE begin realizing certain savings upon
the  consummation  of the Merger and,  accordingly,  costs  associated  with the
Merger and the transition planning and implementation are expected to negatively
impact earnings during 1997. The Company recognized  approximately $1.3 and $2.8
million of costs  associated  with the Merger  during the first three  months of
1997 and 1996,  respectively.  The Merger is  expected  to qualify as a tax-free
reorganization and as a pooling of interests for accounting purposes.

4. Commitments and Contingencies

Regulatory Matters

1995 Merger Rate Filings

      In  connection  with the Merger with SPS, in  November  1995,  the Company
filed  comprehensive  proposals  with the CPUC,  the WPSC and the FERC to obtain
approval of such Merger and the  associated  comprehensive  proposals  from such
regulatory agencies.

      On November 29, 1996, and as modified on January 15, 1997, the CPUC issued
a written  decision  approving  the Merger as well as the major  provisions of a
stipulation and agreement  entered into among the Company,  the CPUC Staff,  the
Colorado  Office  of  Consumer  Counsel  ("OCC"),  and  substantially  all other
parties.  The decision establishes a five year performance based regulatory plan
and acknowledges that the Merger is in the public interest. The major provisions
of the decision include:



                                       8
<PAGE>

             NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS
                                 (Continued)

     -    a $6 million electric rate reduction,  which was instituted October 1,
          1996,  followed by an additional  $12 million  electric rate reduction
          effective  with the  implementation  of new gas rates on  February  1,
          1997,
     -    an annual electric  department earnings test with the sharing of
          earnings in excess of an 11% return on equity for the  calendar  years
          1997-2001 as follows:

          Electric Department      Sharing of Excess Earnings
                                   --------------------------
           Return on Equity       Customers        Shareholders
           ----------------       ---------        ------------
               11-12%               65%              35%
               12-14%               50%              50%
               14-15%               35%              65%
             over 15%              100%              0%;

     -    the termination of the Qualifying  Facilities Capacity Cost Adjustment
          ("QFCCA")  earnings  test which was to become  effective on October 1,
          1996;
     -    a  freeze  in base  electric  rates  for the  period  through December
          31, 2001 with the  flexibility  to make  certain  other rate changes,
          including those necessary to allow for the recovery of DSM, Qualifying
          Facility ("QF") and decommissioning  costs;
     -    a replacement of the Company's ECA with an ICA to allow for a 50%/50%
          sharing of certain fuel and energy cost  increases or decreases  among
          customers and shareholders; and
     -    the implementation of a Quality of Service Plan ("QSP") which provides
          for penalties totaling up to $5 million in year one and increasing to
          $11 million in year five, if the Company does not achieve certain
          performance measures relating to electric reliability, customer
          complaints and telephone response to inquiries.  A  new  docket  was
          opened on March 31, 1997 to address the implementation of a reward
          structure for performance above certain standards.

      The rate reductions,  the earnings sharing, the QSP and the adoption of an
ICA will remain in effect even if the Merger is not  consummated.  The freeze in
base  electric  rates does not  prohibit  the Company from filing a general rate
case or deny any party the  opportunity  to initiate a  complaint  or show cause
proceeding.

Rate Cases

      On June 5,  1996,  the  Company  filed a retail  rate  case  with the CPUC
requesting an annual increase in its jurisdictional  gas department  revenues of
approximately $34 million.  In early 1997, the CPUC approved an overall increase
of approximately $18 million with an 11.25% return on equity, effective February
1, 1997. The Company intends to appeal the CPUC's decision which  disallowed the
recovery of certain postemployment benefit costs under SFAS 112 (see Note 1) and
imputed anticipated merger related cost savings related to the gas business.

      The  Company  filed a rate  case  with  the  FERC on  December  29,  1995,
requesting a slight  overall  rate  increase  (less than 1%) from its  wholesale
electric  customers.  This filing,  among other things,  requested  approval for
recovery  of  Other  Postretirement   Employee  Benefits  ("OPEB")  costs  under
Statement of Financial Accounting Standards No. 106 - "Employers' Accounting for
Postretirement Benefits Other Than Pensions", postemployment benefit costs under
SFAS  112  and  new  depreciation  rates  based  on the  Company's  most  recent
depreciation  study.  On March 29, 1996, the FERC issued an order  accepting for
filing and suspending certain proposed rate changes.  Settlement agreements have
been reached with all parties and filed with the FERC, which,  overall,  results
in a slight  decrease  in rates.  A final  order is expected to be issued in the
second quarter of 1997.

Electric and Gas Cost Adjustment Mechanisms

      During 1994 and 1995,  the CPUC  conducted  several  proceedings to review
issues  related to the ECA.  The CPUC opened a docket to review  whether the ECA
should be maintained in its present form, altered or eliminated,  and



                                       9
<PAGE>

             NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS
                                 (Continued)

on January 8, 1996, combined this docket with the merger docket discussed above.
The CPUC  decision on the Merger  modified and replaced the ECA with an ICA. The
ICA, which became  effective  October 1, 1996,  allows for a 50%/50%  sharing of
certain  fuel and energy  cost  increases  and  decreases  among  customers  and
shareholders.

      The CPUC has had an on-going docket to review and prescribe a standardized
GCA process to determine  the prudence of gas  commodity  and pipeline  delivery
service costs incurred by gas utilities.  Other issues  addressed in this docket
included  whether the GCA should be maintained  in its present form,  altered or
eliminated.  The CPUC  issued an order on April 8, 1997 which  provides  for the
current GCA to be maintained and the adoption of certain standardized filing and
gas purchase reporting requirements.

Environmental Issues

Environmental Site Cleanup

      As described below, the Company has been or is currently involved with the
clean-up of contamination from certain hazardous substances.  In all situations,
the Company is pursuing or intends to pursue  insurance  claims and  believes it
will  recover some  portion of these costs  through  such claims.  Additionally,
where applicable,  the Company intends to pursue recovery from other Potentially
Responsible  Parties ("PRPs").  To the extent such costs are not recovered,  the
Company  currently  believes  it is probable  that such costs will be  recovered
through the rate regulatory  process.  To the extent any costs are not recovered
through the options listed above,  the Company would be required to recognize an
expense for such unrecoverable amounts.

      Under the Comprehensive Environmental Response, Compensation and Liability
Act ("CERCLA"), the U.S. Environmental Protection Agency ("EPA") has identified,
and a Phase II  environmental  assessment  has revealed,  low level,  widespread
contamination from hazardous  substances at the Barter Metals Company ("Barter")
properties  located in central  Denver.  For an estimated 30 years,  the Company
sold  scrap  metal and  electrical  equipment  to Barter for  reprocessing.  The
Company has  completed  the cleanup of this site at a cost of  approximately  $9
million and has received responses from the Colorado Department of Public Health
and Environment  ("CDPHE") indicating that no further action is required related
to these properties. On January 3, 1996, in a lawsuit by the Company against its
insurance  providers,  the Denver District Court entered final judgment in favor
of the  Company in the  amount of $5.6  million  for  certain  cleanup  costs at
Barter.  Several  appeals  and  cross  appeals  have  been  filed  by one of the
insurance  providers  and the  Company in the  Colorado  Court of  Appeals.  The
insurance  provider has posted  supersedeas  bonds in the amount of $9.7 million
($7.7 million attributable to the Barter judgment).  Previously, the Company had
received certain insurance  settlement  proceeds from other insurance  providers
for Barter and other  contaminated sites and a portion of those funds remains to
be allocated to this site by the trial court.  In addition,  the Company expects
to recoup additional  expenditures beyond insurance proceeds through the sale of
the Barter  property and from other PRPs.  In August 1996,  the Company  filed a
lawsuit against four PRPs seeking recovery of certain Barter related costs.

      Polychlorinated  biphenyl  ("PCB") presence was identified in the basement
of an  historic  office  building  located in downtown  Denver.  The Company was
negotiating the future cleanup with the current owners;  however,  on October 5,
1993, the owners filed a civil action against the Company in the Denver District
Court.  The action alleged that the Company was responsible for the PCB releases
and  additionally  claimed other damages in  unspecified  amounts.  On August 8,
1994,  the Denver  District  Court  entered a judgment  approving a $5.3 million
offer of settlement  between the Company and the building  owners  resolving all
claims.  In December  1995,  complaints  were filed by the  Company  against all
applicable  insurance  carriers  in the  Denver  District  Court.  A trial  date
regarding the insurance carriers has been established for August 1997.

     The Ramp Industries disposal facility, located in Denver, Colorado has been
designated  by the EPA as a  Superfund  hazardous  substance  site  pursuant  to
CERCLA.  On November 29,  1995,  the Company  received  from the EPA a Notice of
Potential  Liability  and Request for  Information  related to such site and the
Company has responded to this request. The EPA is conducting an investigation of
the contamination at this site and is in the process of identifying




                                       10
<PAGE>

             NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS
                                 (Continued)

the nature and  quantities  of hazardous  wastes  delivered  to,  processed  and
currently  stored at the site by PRPs.  In April,  1997,  the EPA  informed  the
Company and more than 1,000 other PRPs (as well as the public)  that it plans to
thermally  treat and  dispose of RAMP  hazardous  substances  off-site.  The EPA
estimates the cost of this remedy at between $900,000 and $1.4 million.

      In addition to these sites, the Company has identified several sites where
cleanup of hazardous  substances may be required.  While potential liability and
settlement  costs are still under  investigation  and  negotiation,  the Company
believes that the  resolution of these matters will not have a material  adverse
effect on its  financial  position,  results of  operations  or cash flows.  The
Company fully intends to pursue the recovery of all  significant  costs incurred
for such projects through insurance claims and/or the rate regulatory process.

Environmental Matters Related to Air Quality and Pollution Control

      Under the Clean Air Act Amendments of 1990,  coal burning power plants are
required to reduce sulfur dioxide  ("SO2") and nitrogen oxide ("NOx")  emissions
to specified  levels through a phased  approach.  The Company`s  facilities must
comply with the Phase II requirements  which will be effective in the year 2000.
The  Company  expects  to meet the  Phase II  emission  standards  placed on SO2
through  the use of low  sulfur  coal and the  operation  of  pollution  control
equipment  on certain  generation  facilities.  The Company  will be required to
modify certain  boilers by the year 2000 to reduce the NOx emissions in order to
comply with Phase II requirements. The estimated Phase II costs for future plant
modifications to meet NOx requirements is approximately $13 million. The Company
is studying its options to reduce NOx and SO2 emissions and,  currently does not
anticipate that these regulations will significantly impact its operations.

Craig Steam Electric Generating Station

      On October 9, 1996, a conservation  organization  filed a complaint in the
U.S.  District  Court  pursuant to  provisions of the Federal Clean Air Act (the
"Act") against the joint owners of the Craig Steam Electric  Generating Station.
Tri-State is the operator of the Craig station and the Company owns an undivided
interest  (acquired in April 1992) in each of two units at the station  totaling
approximately  9.7%. The plaintiff alleged that: 1) the station exceeded the 20%
opacity  limitations in excess of 14,000 six minute  intervals during the period
extending from the first quarter of 1991 through the second quarter of 1996, and
2) the owners failed to operate the station in a manner consistent with good air
pollution  control  practices.  The complaint seeks,  among other things,  civil
monetary  penalties and injunctive  relief. The Act provides for penalties of up
to $25,000  per day per  violation,  but the level of  penalties  imposed in any
particular  instance is  discretionary.  The Company  does not believe  that its
potential  liability or the future impact of this litigation on plant operations
will have a material  adverse  impact on the  Company's  results of  operations,
financial  position  or cash  flows.  This  litigation  is similar to the Hayden
Station  complaint  which was settled in 1996 as disclosed in the Company's 1996
Annual Report on Form 10-K.

Valmont Steam Electric Generating Station

      On July 1, 1996, the Company  received a Notice of Violation  ("NOV") from
the CDPHE which  alleges  inadequate  reporting of NOx and SO2  information  and
excess NOx emissions at the Valmont Steam  Electric  Generating  Station for the
period  January 1, 1995  through  August 22,  1995.  In April 1997,  the Company
settled the NOV with the CDPHE in a manner which did not have a material adverse
impact on the Company's results of operations, financial position or cash flows.

Employee Litigation

      Several  employee  lawsuits have been filed against the Company  involving
alleged discrimination and breach of certain fiduciary duties to employees.  The
Company is actively  contesting all such lawsuits and believes that the ultimate
outcome  will not have a material  adverse  impact on the  Company's  results of
operations, financial position or cash flow.


                                       11
<PAGE>

             NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS
                                 (Continued)

      On August 13, 1996, eighty-eight former Information Technology and Systems
("IT&S") employees filed a lawsuit against the Company. The complaint, which was
subsequently  amended to add two other former IT&S  employees,  alleges that the
Company  unfairly  amended its severance plan in connection with a restructuring
in late 1994 to exclude the IT&S function/positions that were outsourced to IBM,
effective February 1, 1995. The Company believes that the amended severance plan
is lawful and enforceable and believes that the ultimate  outcome of the lawsuit
will not have a material adverse impact on the Company's  results of operations,
financial position or cash flows.

      On  July  19,  1996,  a class  action  complaint  was  filed  by  fourteen
plaintiffs,   which  was  subsequently   amended  to  include  three  additional
plaintiffs, allegedly on behalf of all non-managerial, non-clerical women in the
Company's  regional  facilities.  The  complaint  asserts  that the  Company has
engaged  in a  company-wide  pattern  and  practice  of  sexual  discrimination,
including sexual harassment and retaliation. A previous class complaint filed by
some of these plaintiffs along with other named plaintiffs,  was withdrawn after
the Company  filed its  response.  It is too early to predict the outcome of the
class action complaint. The Company intends to actively contest the class action
and believes the ultimate outcome of the individual  plaintiffs'  cases will not
have a material adverse impact on the Company's results of operations, financial
position or cash flows.

      Certain   employees   terminated  as  part  of  the  Company's   1991/1992
organizational analysis asserted breach of contract and promissory estoppel with
respect  to job  security  and  breach of the  covenant  of good  faith and fair
dealing.  Of the 21 actions filed, the trial court directed verdicts in favor of
the Company in 19 cases. A jury entered  verdicts  adverse to the Company in two
cases which were subsequently  appealed by the Company. On February 6, 1997, the
Colorado  Court of  Appeals  issued a  decision  on all  issues  in favor of the
Company and on April 3, 1997 the employees appealed the decision of the Colorado
Court of Appeals to the Colorado  Supreme Court.  The Company  believes that the
ultimate  outcome of the lawsuit will not have a material  adverse impact on the
Company's results of operations, financial position or cash flow.

      During 1996, the International  Brotherhood of Electrical  Workers,  Local
111 ("IBEW  Local 111")  filed  several  grievances  before the  National  Labor
Relations  Board  relating to the employment of certain  non-union  personnel to
perform  services for the  Company.  A decision has been entered on three of the
multiple grievances,  with two of those decisions requiring that the Company pay
union wage rates on new  construction  jobs  performed by outside  vendors.  The
Company had filed suit seeking to reverse one of these decisions and challenging
the  subcontracting  provision of the labor  agreement,  all of the  outstanding
subcontracting  grievances  and  both  of  the  existing  adverse  decisions  as
violations  of federal  law. The Company and the union have reached a settlement
resolving  all  issues and the  Company  has  withdrawn  its'  previously  filed
lawsuit.  Approximately  45% of the Company's  workforce is  represented by IBEW
Local 111.

5.  Acquisition and Divestiture of Investments

Acquisition of Yorkshire Electricity

      On February 24,  1997,  the Company and American  Electric  Power  ("AEP")
jointly announced that they had reached agreement with the board of directors of
Yorkshire  Electricity  Group plc  ("Yorkshire  Electricity"),  a United Kingdom
regional  electricity  company,  on the terms of a recommended cash tender offer
for  all of the  outstanding  and to be  issued  ordinary  shares  of  Yorkshire
Electricity.  On April 1, 1997,  the Company and AEP  announced  that  Yorkshire
Holdings plc ("Yorkshire Holdings"),  a joint venture among the Company and AEP,
had declared the cash tender offer  wholly  unconditional  in all respects  and,
thereby,   committed  to  purchase  all  the  outstanding  shares  of  Yorkshire
Electricity.

      As of April 30, 1997,  valid  acceptances of Yorkshire  Holdings' offer to
purchase  shares  of  Yorkshire  Electricity  have  been  received  representing
approximately 96.25% of Yorkshire  Electricity's issued share capital. Under the
provisions  of the  United  Kingdom's  Companies  Act 1985,  Yorkshire  Holdings
intends to  exercise  its 



                                       12
<PAGE>

             NOTES TO CONSOLIDATED CONDENSED FINANCIAL STATEMENTS
                                 (Continued)

rights to  acquire,  under  the  terms of the  offer,  the  remaining  shares in
Yorkshire  Electricity in respect of which acceptances of the offer have not yet
been received.

      Total  consideration  to be paid by Yorkshire  Holdings is estimated to be
approximately $2.4 billion (1.5 billion pounds sterling).  Yorkshire Holdings is
a wholly-owned  subsidiary of Yorkshire  Power Group Ltd.  ("Yorkshire  Power"),
which is equally  owned by  subsidiary  companies  of the Company  and AEP.  The
acquisition  will be  financed  by  Yorkshire  Power  through a  combination  of
approximately 25% equity and 75% debt,  including the assumption of the existing
debt of Yorkshire  Electricity.  The funds for the acquisition  will be obtained
from the Company's and AEP's investment in Yorkshire Power of approximately $360
million (220 million pounds sterling) each, with the remainder to be obtained by
Yorkshire Power through the issuance of non-recourse debt. Yorkshire Power will,
in turn, fund Yorkshire Holdings for the purpose of the acquisition. The Company
initially  funded its entire equity  investment in Yorkshire  Power through $250
million of publicly issued secured medium-term notes with varying maturities and
drawings  of $110  million on its  short-term  lines of credit  pursuant  to its
short-term  credit  agreement with Bank of America as agent.  At March 31, 1997,
these funds were invested in temporary cash  investments in  anticipation of the
equity investment to be made in April 1997.

      The Company  will have an indirect  50%  ownership  interest in  Yorkshire
Electricity, which will be accounted for using the equity method of accounting.

6.  Management's Representations

      In the opinion of the Company,  the  accompanying  unaudited  consolidated
condensed  financial  statements include all adjustments  necessary for the fair
presentation  of the financial  position of the Company and its  subsidiaries at
March 31, 1997 and  December 31, 1996,  and the results of  operations  and cash
flows for the three  months  ended  March 31,  1997 and 1996.  The  consolidated
condensed financial  information and notes thereto should be read in conjunction
with the  consolidated  financial  statements  and  notes  for the  years  ended
December 31, 1996, 1995 and 1994 included in the Company's 1996 Annual Report on
Form 10-K filed with the Securities and Exchange Commission.

      Because of seasonal and other  factors,  the results of operations for the
three  months  ended  March 31,  1997  should not be taken as an  indication  of
earnings for all or any part of the balance of the year.





                                       13
<PAGE>


                   REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS


TO THE BOARD OF DIRECTORS AND SHAREHOLDERS OF
PUBLIC SERVICE COMPANY OF COLORADO

We have reviewed the accompanying consolidated condensed balance sheet of Public
Service  Company of Colorado (a Colorado  corporation)  and  subsidiaries  as of
March 31, 1997, and the related consolidated  condensed statements of income and
cash flows for the three month  periods  ended  March 31,  1997 and 1996.  These
financial statements are the responsibility of the Company's management.

We conducted our review in accordance with standards established by the American
Institute  of  Certified  Public  Accountants.  A review  of  interim  financial
information consists principally of applying analytical  procedures to financial
data and making  inquiries of persons  responsible  for financial and accounting
matters. It is substantially less in scope than an audit conducted in accordance
with  generally  accepted  auditing  standards,  the  objective  of which is the
expression of an opinion  regarding the financial  statements  taken as a whole.
Accordingly, we do not express such an opinion.

Based on our review, we are not aware of any material  modifications that should
be  made  to the  financial  statements  referred  to  above  for  them to be in
conformity with generally accepted accounting principles.

We have  previously  audited,  in accordance  with generally  accepted  auditing
standards,  the consolidated balance sheet of Public Service Company of Colorado
and  subsidiaries  as of December 31, 1996 (not presented  herein),  and, in our
report  dated  February 24, 1997,  we expressed an  unqualified  opinion on that
statement.  In our  opinion,  the  information  set  forth  in the  accompanying
consolidated  condensed balance sheet as of December 31, 1996, is fairly stated,
in all material  respects,  in relation to the  consolidated  balance sheet from
which it has been derived.


                                                        ARTHUR ANDERSEN LLP
Denver, Colorado,
May 12, 1997




                                       14
<PAGE>


Item 2.  Management's  Discussion  and  Analysis of  Financial  Condition  and
Results of Operations

Earnings

      Earnings per share were $0.92 for the first quarter of 1997 as compared to
$0.97 for the first quarter of 1996. While earnings were positively  impacted by
continued  customer  growth  contributing  to increased  electric  sales and gas
deliveries  as well as the  Company's  cost  containment  efforts,  there  was a
decline in the 1997 first  quarter  earnings  as  compared to the same period in
1996.  This  decline was  attributable  to the  favorable  impact in 1996 of the
February 9, 1996  settlement  agreement with the DOE resolving all spent nuclear
fuel storage and  disposal  issues at Fort St. Vrain (see Note 2. Fort St. Vrain
in Item 1. FINANCIAL  STATEMENTS) offset, in part, by the recognition of various
non-recurring expense items during that period.

Electric Operations

      The following table details the change in electric  operating revenues and
energy  costs for the first  quarter of 1997 as  compared  to the same period in
1996.
                                                      Increase (Decrease)
                                                      -------------------
                                                    (Thousands of Dollars)
Electric operating revenues:
 Retail...............................................     $(5,799)
 Wholesale............................................       1,449
 Non-regulated power marketing........................       5,648
 Other (including unbilled revenues)..................       2,538
                                                           -------
  Total revenues......................................       3,836
Fuel used in generation...............................      (2,076)
Purchased power.......................................         191
                                                           -------
  Net increase in electric margin.....................     $ 5,721
                                                           =======

      The following table compares  electric Kwh sales by major customer classes
for the first quarter of 1997 and 1996.
                                              Millions of Kwh Sales
                                              ---------------------
                                                 1997       1996   %Change *
                                                 ----       ----   ---------
Residential ...............................     1,867     1,833      1.9%
Commercial and Industrial  ................     3,842     3,776      1.8
Public Authority ..........................        48        51     (6.4)
                                                -----     -----
  Total Retail.............................     5,757     5,660      1.7
Wholesale..................................       850       792      7.4
Non-regulated power marketing..............       367         -      -
                                                -----     -----
  Total....................................     6,974     6,452      8.1
                                                =====     =====

*  Percentages are calculated using unrounded amounts

      Electric  margin  increased in the first quarter of 1997, when compared to
the first  quarter of 1996,  primarily  due to higher  electric Kwh retail sales
resulting  from customer  growth  offset,  in part, by lower fuel costs and rate
reductions  effective  October 1, 1996 and February 1, 1997, which resulted from
the settlement of the Merger  proceedings  in Colorado (see Note 4.  Commitments
and  Contingencies  - Merger in Item 1. FINANCIAL  STATEMENTS).  Power marketing
activities by non-regulated  subsidiaries initiated in the third quarter of 1996
have contributed to increased  operating revenues,  however,  the margin on such
sales is minimal.

      The Company and Cheyenne have cost adjustment  mechanisms  which recognize
the majority of the effects of changes in fuel used in generation  and purchased
power costs and allow recovery of such costs on a timely basis. As a result, the
changes in revenues  associated with these mechanisms  during the first quarters
of 1997 and 1996 had little impact on net income.  However, as discussed in Note
4.  Commitments and



                                       15
<PAGE>

Contingencies - Regulatory Matters in Item 1. FINANCIAL  STATEMENTS,  in its
decision  on the  Merger,  the  CPUC  replaced  the  Company's  ECA with an ICA,
effective  October 1, 1996,  which allows for a 50%/50%  sharing of certain fuel
and energy cost increases and decreases  among customers and  shareholders.  The
change did not impact the cost recoveries for the first quarter of 1997.

      Fuel used in generation  expense decreased  approximately  4.5% during the
first quarter of 1997, as compared to the same quarter in 1996, due to decreased
generation  levels at the Company's  power plants and lower coal supply costs in
the first quarter of 1997.

      Purchased  power expense  increased  slightly  during the first quarter of
1997, as compared to the same quarter in 1996. Costs incurred in connection with
the increased  non-regulated  power marketing sales were partially offset by the
lower costs of economy purchases from other utilities to meet customer demand.

Gas Operations

      The following  table details the change in revenues from gas sales and gas
purchased  for resale  for the first  quarter  of 1997 as  compared  to the same
period in 1996.
                                                     Increase (Decrease)
                                                     -------------------
                                                   (Thousands of Dollars)

Revenues from gas sales (including unbilled revenues).      48,470
Gas purchased for resale..............................      46,628
                                                           -------
 Net increase in gas sales margin.....................     $ 1,842
                                                           =======

      The  following  table  compares gas  decatherm  (Dth)  deliveries by major
customer classes for the first quarter of 1997 and 1996.

                                      Millions of Dth Deliveries
                                      --------------------------
                                                1997  1996    % Change *
                                                ----  ----    ----------
Residential................................     39.6  39.0       1.4%
Commercial.................................     21.3  22.3      (4.4)
Non-regulated gas marketing................     15.6   0.7      **
                                               ----- -----
  Total Sales..............................     76.5  62.0      23.4
Gathering and Processing...................      0.1   0.2      **
Transportation.............................     25.1  22.3      12.6
                                               ----- -----
  Total....................................    101.7  84.5      20.3
                                               ===== =====

*  Percentages are calculated using unrounded amounts
** Percentage  change is  significant,  but  presentation of the amount is not
meaningful

      Gas sales margin  increased in the first quarter of 1997, when compared to
the first quarter of 1996,  primarily  due to an increase in the Company's  base
revenues associated with the higher rates effective February 1, 1997,  resulting
from the  Company's  1996 rate case and higher retail gas sales  resulting  from
annual  customer  growth of  approximately  3.5%.  In  addition,  gas  marketing
activities by non-regulated  subsidiaries  favorably contributed to the increase
in gas sales margin.  Gas costs were higher during the first quarter of 1997, as
compared to the same period of 1996,  as a result of higher gas prices  incurred
through the winter heating season.

      Gas  transportation,  gathering,  processing and other revenues  increased
$1.1  million  during the first  quarter  of 1997,  when  compared  to the first
quarter of 1996,  primarily  due to an increase  in  transport  deliveries.  The
higher transport  deliveries are attributable to the shifting of various Company
commercial  sales  customers to firm  transport  customers.  Historically,  this
shifting  has not had an impact on gas  margin  and is not  expected  to have an
impact in the future.


                                       16
<PAGE>

      The  Company and  Cheyenne  have in place GCA  mechanisms  for natural gas
sales, which recognize the majority of the effects of changes in the cost of gas
purchased  for resale and adjust  revenues to reflect  such changes in cost on a
timely  basis.  As a result,  the  changes  in  revenues  associated  with these
mechanisms  during the first  quarters of 1997 and 1996 had little impact on net
income.  However,  the  fluctuations  in gas sales  impact the amount of gas the
Company must purchase and, therefore,  along with the increases and decreases in
the per-unit cost of gas, affect total gas purchased for resale.

Non-Fuel Operating Expenses

      Other operating and maintenance expenses increased $9.7 million during the
first quarter of 1997, as compared to the same period in 1996,  primarily due to
the  favorable  impact on 1996 first  quarter  earnings of the  February 9, 1996
settlement  agreement  with the DOE resolving all spent nuclear fuel storage and
disposal issues at Fort St. Vrain  (approximately  $16 million) offset, in part,
by  costs  incurred  during  the  first  quarter  of 1996  associated  with  the
settlement  agreement of certain  environmental issues related to the operations
of the Hayden Steam Electric Generation Station. In addition, the current period
results  were  favorably  impacted  by lower  employee  benefit  costs and other
general reductions resulting from the Company's cost containment efforts.

      Depreciation and amortization expense increased $6.0 million, or 16.3%, in
the first quarter of 1997, as compared to the same period in 1996, primarily due
to the  depreciation  of  property  additions  and the  higher  amortization  of
software costs.

      The decrease in income taxes for the first quarter of 1997, as compared to
the same period in 1996,  is  primarily  due to lower  pre-tax  income,  the tax
effects of recognizing certain non-deductible  environmental and Merger costs in
1996 and the prior year accrual for additional tax liabilities.

      Miscellaneous income and deductions - net increased $4.4 million primarily
due to lower Merger costs in 1997 and higher  interest  income on temporary cash
investments,   which  resulted  from  the  borrowings  in  anticipation  of  the
investment  to  be  made  in  acquiring  Yorkshire  Electricity.   See  Note  5.
Acquisition and Divestiture of Investments  Acquisition of Yorkshire Electricity
in Item 1. FINANCIAL STATEMENTS.

      Interest expense  increased $5.4 million during the first quarter of 1997,
when  compared  to the  same  quarter  in 1996,  primarily  due to  interest  on
borrowings  utilized  to  finance  capital   expenditures  and  the  anticipated
acquisition of Yorkshire Electricity.  These borrowings included the issuance of
$75 million  and $250  million of  medium-term  notes in January and March 1997,
respectively.

Financial Position

      Accounts payable decreased  approximately  $100 million at March 31, 1997,
as compared to December  31,  1996,  primarily  due to the impact of  seasonally
lower  gas  purchases.  This  also  contributed  to the  reduction  in  accounts
receivable.

Commitments and Contingencies

      Issues relating to regulatory and  environmental  matters are discussed in
Note 4 in Item 1. FINANCIAL STATEMENTS.  These matters and the future resolution
thereof  may impact  the  Company's  future  results  of  operations,  financial
position or cash flows.

Common Stock Dividend

      In March 1997,  the Board of  Directors  ("the  Board")  approved a common
stock dividend at the rate of $0.525 per share. In anticipation of the effective
date of the Merger,  in April 1997 the Board approved a partial dividend payable
to  shareholders  of the Company  covering the period April 12, 1997 through the
day prior to the Merger  completion,  based on the  quarterly  dividend  rate of
$0.525, but prorated for the number of days in the interim 


                                       17
<PAGE>

period. This dividend is approved as long as the effective date of the Merger is
not later than July 1,  1997.  During the first  quarter  of 1996,  the  Company
increased the quarterly  common stock  dividend of $0.51 per share to $0.525 per
share. The Company's common stock dividend level is dependent upon the Company's
results of operations,  financial  position,  cash flows and other factors.  The
Board of  Directors  of the Company  will  continue to evaluate the common stock
dividend level on a quarterly basis. After consummation of the Merger, dividends
will be paid to NCE as the holder of all of the Company's common stock.

Liquidity and Capital Resources

Cash Flows - Three Months Ended March 31
                                                         1997    1996   Decrease
                                                         ----    ----   --------
Net cash provided by operating activities (in millions)  $68.2   $123.3  $(55.1)

      Cash provided by operating  activities decreased in the first three months
of 1997,  when compared to the first three months of 1996,  primarily due to the
increase  in payments to gas  suppliers  resulting  from the higher gas costs in
late 1996 and early 1997. A portion of these higher gas costs have been deferred
through  the GCA and will be  recovered  from  customers  in the  future.  These
decreases were offset, in part, by an increase in accounts  receivable which was
attributable  to a gas refund  made late in 1995 that was  applied  directly  to
customers'  accounts and served to lower cash receipts  during the first quarter
of 1996.

                                                          1997    1996  Decrease
                                                          ----    ----  --------
Net cash used in investing activities (in millions)     $(52.5) $(60.7)   $(8.2)

      Cash used in investing  activities decreased during the three months ended
March 31, 1997, when compared to the same period in 1996, primarily due to lower
construction expenditures.

                                                          1997    1996  Increase
                                                          ----    ----  --------
Net cash provided by (used in)
  financing activities (in millions)                    $343.3  $(64.8)   $408.1

      Cash provided by financing  activities  increased  (indicating  that there
were more  borrowings)  in the first three months of 1997,  when compared to the
first three  months of 1996,  primarily  due to the  issuance of $75 million and
$250 million of medium term notes in January and March 1997,  respectively.  The
proceeds  from  the $75  million  financing  were  used to  fund  the  Company's
construction program. The Company used the proceeds from the $250 million medium
term notes, together with additional borrowings of approximately $110 million on
its  short-term   lines  of  credit,   to  fund  its  acquisition  of  Yorkshire
Electricity.   See  Note  5.   Acquisition  and  Divestiture  of  Investments  -
Acquisition of Yorkshire Electricity in Item 1. FINANCIAL STATEMENTS.



                                       18
<PAGE>

                         PART II - OTHER INFORMATION


Item 1.  Legal Proceedings

      Part 1.     See Note 4. Commitments and Contingencies in Item 1, Part 1.

Item 6.  Exhibits and Reports on Form 8-K

(a) Exhibits

    4(a)   Supplemental  Indenture dated as of February 1, 1997,  establishing a
           series  of First  Mortgage  Bonds  under  the  Indenture  dated as of
           December 31, 1939

    4(b)   Supplemental   Indenture  No.  6  dated  as  of  February  1,  1997
           establishing  a series  of  Secured  Medium-Term  Notes  under  the
           Indenture dated as of October 1, 1993.

    12(a)  Computation of Ratio of Consolidated  Earnings to Consolidated  Fixed
           Charges is set forth at page 22 herein.

    12(b)  Computation  of  Ratio of  Consolidated  Earnings  to  Consolidated
           Combined Fixed Charges and Preferred  Stock  Dividends is set forth
           at page 23 herein.

    15     Letter  from  Arthur   Andersen  LLP  regarding   unaudited   interim
           information is set forth at page 24 herein.

    27     Financial Data Schedule UT


(b) Reports on Form 8-K

    The  following  reports on Form 8-K were filed  since the  beginning  of the
first quarter of 1997.

      - A report on Form 8-K dated  February 24, 1997, was filed on February 24,
      1997.  The item reported was Item 5. Other  Events:  On February 24, 1997,
      the Company and AEP jointly announced that they reached agreement with the
      board of directors of Yorkshire Electricity, on the terms of a recommended
      cash tender  offer for all of the  outstanding  and to be issued  ordinary
      shares of Yorkshire Electricity.

      - A report on Form 8-K dated  April 1, 1997,  was filed on April 15,  1997
      which included the following two items:

      Item 2.  Acquisition  or  Disposition  of Assets:  On April 1,  1997,  the
      Company and AEP announced that Yorkshire  Holdings,  a joint venture among
      the Company and AEP,  had  declared  the cash tender offer to purchase all
      the  outstanding and to be issued shares of Yorkshire  Electricity  wholly
      unconditional in all respects and,  thereby,  is committed to purchase all
      the outstanding shares of Yorkshire Electricity.

      Item 7.  Financial  Statements and Exhibits:  (a) Financial  Statements of
      Business Acquired and (b) Pro Forma Financial Information. For both topics
      (a) and (b),  it was  impracticable  to  provide  the  required  financial
      statements or pro forma financial information for Yorkshire Electricity at
      the date the report was filed.  The required  financial  statements or pro
      forma financial  information will be filed as soon as practicable,  but no
      later than 60 days after the date the report was filed.



                                       19
<PAGE>


                                  SIGNATURE

      Pursuant  to the  requirements  of Section  13 or 15(d) of the  Securities
Exchange Act of 1934,  Public  Service  Company of Colorado has duly caused this
report to be signed on its behalf by the undersigned, thereunto duly authorized.

                                          PUBLIC SERVICE COMPANY OF COLORADO

                                          By     /s/ R. C. Kelly
                                          ---------------------------------
                                                   R. C. KELLY
                                             Senior Vice President,
                                             Finance, Treasurer and
                                             Chief Financial Officer

Dated: May 14, 1997




                                       20
<PAGE>



                                 EXHIBIT INDEX

4(a)     Supplemental  Indenture  dated as of February 1, 1997,  establishing  a
         series of First Mortgage Bonds under the Indenture dated as of December
         31, 1939.

4(b)     Supplemental   Indenture   No.  6  dated  as  of   February  1,  1997
         establishing  a  series  of  Secured   Medium-Term  Notes  under  the
         Indenture dated as of October 1, 1993.

12(a)    Computation of Ratio of  Consolidated  Earnings to  Consolidated  Fixed
         Charges is set forth at page 22 herein.

12(b)    Computation  of  Ratio  of  Consolidated   Earnings  to  Consolidated
         Combined Fixed Charges and Preferred  Stock Dividends is set forth at
         page 23 herein.

15       Letter from Arthur Andersen LLP regarding unaudited interim information
         is set forth at page 24 herein.

27       Financial Data Schedule UT.




                                       21
<PAGE>


                                                                 EXHIBIT 12(a)

                      PUBLIC SERVICE COMPANY OF COLORADO
                               AND SUBSIDIARIES

                COMPUTATION OF RATIO OF CONSOLIDATED EARNINGS
                        TO CONSOLIDATED FIXED CHARGES

          (not covered by Report of Independent Public Accountants)



                                                    Three Months Ended
                                                        March 31,
                                                      1997       1996
                                                      ----       ----
                                           (Thousands of Dollars, except ratios)

Fixed charges:

   Interest on long-term debt...................     $ 26,906   $ 22,068
   Interest on borrowings against corporate-owned
     life insurance contracts...................       10,736      9,258
   Other interest...............................        3,939      4,413
   Amortization of debt discount and expense less
     premium ...................................          928        977
   Interest component of rental expense.........        2,583      2,746
                                                       ------     ------

     Total .....................................     $ 45,092   $ 39,462
                                                     ========   ========

Earnings (before fixed charges and taxes on income):
   Net income...................................     $ 62,881   $ 64,429
   Fixed charges as above.......................       45,092     39,462
   Provisions for Federal and state taxes on income,
   net of investment tax credit amortization....       35,317     41,146
                                                       ------     ------

     Total......................................     $143,290   $145,037
                                                     ========   ========

Ratio of earnings to fixed charges..............         3.18       3.68
                                                         ====       ====


                                       22
<PAGE>

                                                                 EXHIBIT 12(b)

                      PUBLIC SERVICE COMPANY OF COLORADO
                               AND SUBSIDIARIES

                COMPUTATION OF RATIO OF CONSOLIDATED EARNINGS
     TO CONSOLIDATED COMBINED FIXED CHARGES AND PREFERRED STOCK DIVIDENDS

          (not covered by Report of Independent Public Accountants)



                                                   Three  Months Ended
                                                       March 31,
                                                    1997      1996
                                                    ----      ----
                                         (Thousands of Dollars, except ratios)

Fixed charges and preferred stock dividends:

   Interest on long-term debt..................    $ 26,906  $ 22,068
   Interest on borrowings against corporate-owned
     life insurance contracts..................      10,736     9,258
   Other interest..............................       3,939     4,413
   Amortization of debt discount and expense less
      premium .................................         928       977
   Interest component of rental expense........       2,583     2,746
   Preferred stock dividend requirement........       2,943     2,972
   Additional preferred stock dividend requirement    1,653     1,898
                                                      -----     -----

     Total ....................................    $ 49,688  $ 44,332
                                                   ========  ========

Earnings (before fixed charges and taxes on income):
   Net income..................................    $ 62,881  $ 64,429
   Interest on long-term debt..................      26,906    22,068
   Interest on borrowings against corporate-owned
     life insurance contracts..................      10,736     9,258
   Other interest..............................       3,939     4,413
   Amortization of debt discount and expense less
     premium ..................................         928       977
   Interest component of rental expense........       2,583     2,746
   Provisions for Federal and state taxes on income,
   net of investment tax credit amortization...      35,317    41,146
                                                     ------   -------

     Total.....................................    $143,290  $145,037
                                                   ========  ========

Ratio of earnings to fixed charges
  and preferred stock dividends................      2.88      3.27
                                                     ====      ====



                                       23
<PAGE>


                                                                    EXHIBIT 15
May 12, 1997


Public Service Company of Colorado:

      We are aware that Public Service  Company of Colorado has  incorporated by
reference in its Registration Statement (Form S-3, File No. 33-62233) pertaining
to the Automatic  Dividend  Reinvestment  and Common Stock  Purchase  Plan;  the
Company's  Registration  Statement (Form S-3, File No. 33-37431),  as amended on
December 4, 1990,  pertaining to the shelf  registration  of the Company's First
Mortgage  Bonds;  the  Company's  Registration  Statement  (Form  S-8,  File No.
33-55432)  pertaining to the Omnibus Incentive Plan; the Company's  Registration
Statement (Form S-3, File No. 33-51167)  pertaining to the shelf registration of
the Company's  First  Collateral  Trust Bonds;  and the  Company's  Registration
Statement (Form S-3, File No. 33-54877)  pertaining to the shelf registration of
the Company's First Collateral  Trust Bonds and Cumulative  Preferred Stock, its
Form 10-Q for the quarter ended March 31, 1997,  which includes our report dated
May 12, 1997, covering the unaudited consolidated condensed financial statements
contained therein.  Pursuant to Regulation C of the Securities Act of 1933, that
report  is not  considered  a part of the  registration  statement  prepared  or
certified  by our Firm or a report  prepared or certified by our Firm within the
meaning of Sections 7 and 11 of the Act.


                                                        Very truly yours,



                                                        ARTHUR ANDERSEN LLP

                                       24
<PAGE>
                                                            EXHIBIT 4(a)












                            SUPPLEMENTAL INDENTURE


                         Dated as of February 1, 1997







                      PUBLIC SERVICE COMPANY OF COLORADO


                                      TO


                           FIRST TRUST OF NEW YORK,
                             NATIONAL ASSOCIATION,

                                                                    As Trustee





                  Creating an Issue of First Mortgage Bonds,
                              Collateral Series E




     (Supplemental to Indenture dated as of December 1, 1939, as amended)


<PAGE>





            SUPPLEMENTAL INDENTURE, dated as of February 1, 1997, between PUBLIC
SERVICE COMPANY OF COLORADO, a corporation organized and existing under the laws
of the State of Colorado  (the  "Company"),  party of the first part,  and FIRST
TRUST OF NEW YORK,  NATIONAL  ASSOCIATION,  a national banking  association,  as
successor  trustee (the  "Trustee") to Morgan Guaranty Trust Company of New York
(formerly Guaranty Trust Company of New York), party of the second part.

            WHEREAS,  the  Company  heretofore  executed  and  delivered  to the
Trustee its Indenture, dated as of December 1, 1939 (the "Principal Indenture"),
to secure its First Mortgage Bonds from time to time issued thereunder; and

            WHEREAS,  the Company has  heretofore  executed and delivered to the
Trustee the Supplemental Indentures referred to in Schedule A hereto for certain
purposes,  including the creation of series of bonds, the subjection to the lien
of the Principal Indenture of property acquired after the execution and delivery
thereof,  the amendment of certain provisions of the Principal Indenture and the
appointment of the successor Trustee; and

            WHEREAS,  the Principal Indenture as supplemented and amended by all
Supplemental  Indentures  heretofore  executed by the Company and the Trustee is
hereinafter  referred to as the  "Indenture,"  and, unless the context  requires
otherwise,  references herein to Articles and Sections of the Indenture shall be
to Articles and Sections of the Principal Indenture as so amended; and

            WHEREAS,  the  Company  proposes  to  create a new  series  of First
Mortgage Bonds to be designated as First  Mortgage  Bonds,  Collateral  Series E
(the "Collateral Series E Bonds"),  to be issued and delivered from time to time
to the trustee under the 1993 Mortgage (as hereinafter defined) as the basis for
the  authentication  and  delivery  under  the  1993  Mortgage  of a  series  of
securities  constituting  medium-term notes, all as hereinafter provided, and to
vary in certain respects the covenants and provisions  contained in Article V of
the Indenture,  to the extent that such  covenants and  provisions  apply to the
Collateral Series E Bonds; and

            WHEREAS,  the Company,  pursuant to the provisions of the Indenture,
has, by appropriate  corporate  action,  duly resolved and determined to execute
this Supplemental Indenture for the purpose of providing for the creation of the
Collateral Series E Bonds and of specifying the form, provisions and particulars
thereof,  as in  the  Indenture  provided  or  permitted  and of  giving  to the
Collateral Series E Bonds the protection and security of the Indenture; and

            WHEREAS,   the  Company  has   acquired  the   additional   property
hereinafter described,  and the Company desires that such additional property so
acquired be specifically subjected to the lien of the Indenture; and

            WHEREAS,  the  Company  represents  that all  acts  and  proceedings
required by law and by the charter and  by-laws of the  Company,  including  all
action  requisite  on the  part of its  shareholders,  directors  and  officers,
necessary to make the Collateral  Series E Bonds,  when executed by the Company,
authenticated and delivered by the Trustee and duly issued,  the valid,  binding
and legal obligations of the Company,  and to constitute the Principal Indenture
and all indentures supplemental thereto,  including this Supplemental Indenture,
valid,  binding  and  legal  instruments  for the  security  of the bonds of all
series, including the Collateral Series E Bonds, in accordance with the terms of
such bonds and such instruments,  have been done,  performed and fulfilled,  and
the execution and delivery hereof have been in all respects duly authorized;

            NOW, THEREFORE, THIS SUPPLEMENTAL INDENTURE WITNESSETH:
<PAGE>

            That Public  Service  Company of Colorado,  the Company named in the
Indenture, in consideration of the premises and of One Dollar to it duly paid by
the  Trustee at or before the  ensealing  and  delivery of these  presents,  the
receipt  whereof is hereby  acknowledged,  and in pursuance of the direction and
authority of the Board of Directors  of the Company  given at a meeting  thereof
duly called and held, and in order to create the  Collateral  Series E Bonds and
to specify the form,  terms and  provisions  thereof,  and to make  definite and
certain the lien of the Indenture upon the premises hereinafter described and to
subject said premises  directly to the lien of the Indenture,  and to secure the
payment of the principal of and premium,  if any, and  interest,  if any, on all
bonds  from  time  to  time  outstanding  under  the  Indenture,  including  the
Collateral  Series E Bonds,  according to the terms of said bonds, and to secure
the performance and observance of all of the covenants and conditions  contained
in the Indenture, has executed and delivered this Supplemental Indenture and has
granted,  bargained,  sold, warranted,  aliened,  remised,  released,  conveyed,
assigned, transferred,  mortgaged, pledged, set over and confirmed, and by these
presents does grant, bargain,  sell, warrant,  alien, remise,  release,  convey,
assign, transfer, mortgage, pledge, set over and confirm unto First Trust of New
York, National  Association,  as Trustee, and its successor or successors in the
trust and its and their assigns  forever,  the property  described in Schedule B
hereto  (which  is  described  in such  manner as to fall  within  and under the
headings or parts or  classifications  set forth in the Granting  Clauses of the
Principal Indenture);

            TO HAVE AND TO HOLD the same and all and  singular  the  properties,
rights,  privileges and franchises  described in the Principal  Indenture and in
the  several  Supplemental  Indentures  hereinabove  referred  to  and  in  this
Supplemental Indenture and owned by the Company on the date of the execution and
delivery hereof (other than property of a character  expressly excepted from the
lien of the  Indenture as therein set forth) unto the Trustee and its  successor
or successors and assigns forever;

            SUBJECT, HOWEVER, to permitted encumbrances as defined in the
Indenture;

            IN TRUST,  NEVERTHELESS,  upon the terms and trusts set forth in the
Indenture,  for the equal and proportionate  benefit and security of all present
and future  holders of the bonds and coupons  issued and to be issued  under the
Indenture, including the Collateral Series E Bonds, without preference, priority
or distinction as to lien (except as any sinking,  amortization,  improvement or
other fund established in accordance with the provisions of the Indenture or any
indenture  supplemental  thereto may afford additional security for the bonds of
any particular series) of any of said bonds over any others thereof by reason of
series,  priority in the time of the issue or negotiation  thereof, or otherwise
howsoever, except as provided in Section 2 of Article IV of the Indenture.


                                  ARTICLE ONE

           CREATION AND DESCRIPTION OF THE COLLATERAL SERIES E BONDS

            SECTION  1. A new  series  of bonds to be  issued  from time to time
under and  secured by the  Indenture  is hereby  created,  the bonds of such new
series  to  be  designated  First  Mortgage  Bonds,  Collateral  Series  E.  The
Collateral  Series E Bonds shall be limited to an aggregate  principal amount of
One Hundred  Fifty Million  dollars  ($150,000,000),  excluding  any  Collateral
Series E Bonds which may be authenticated  and exchanged for or in lieu of or in
substitution for or on transfer of other  Collateral  Series E Bonds pursuant to
any  provisions of the Indenture.  The Collateral  Series E Bonds shall not bear
interest and each Collateral Series E Bond shall (a) be issued in such principal
amount,  (b) mature on such date not less than nine  months nor more than thirty
years from its Original Issue Date (as hereinafter  defined),  and (c) have such
other terms and conditions as shall not be  inconsistent  with the provisions of
the  Indenture,  all as shall be  specified  by the  Company  in a  certificate,
executed by the President,  any Vice  President,  the Treasurer or any Assistant
Treasurer of the Company,  delivered to the Trustee  relating to such Collateral

                                       3
<PAGE>

Series  E  Bond  and  referring  to  this  Supplemental   Indenture  (each  such
certificate being deemed to constitute a part of this Supplemental Indenture and
being   hereinafter   sometimes   called  an   "Issuance   Certificate"),   such
specification  by such an officer  of the  Company  in an  Issuance  Certificate
having been  heretofore  authorized in a resolution of the Board of Directors of
the Company.

            The  principal  of each  Collateral  Series E Bond shall be payable,
upon presentation thereof, at the office or agency of the Company in the city in
which the  principal  corporate  trust office of the 1993  Mortgage  Trustee (as
hereinafter defined) is located, in any coin or currency of the United States of
America  which at the time of payment  shall be legal  tender for the payment of
public and private debts.

            The  Collateral  Series E Bonds shall be issued and  delivered  from
time to time by the Company to First Trust of New York, National Association, as
successor  trustee  under  the  Indenture,  dated  as of  October  1,  1993,  as
supplemented  (the "1993  Mortgage"),  of the Company to such trustee (the "1993
Mortgage  Trustee"),  as the basis for the authentication and delivery under the
1993 Mortgage of a series of securities.  As provided in the 1993 Mortgage,  the
Collateral  Series E Bonds will be  registered  in the name of the 1993 Mortgage
Trustee or its nominee and will be owned and held by the 1993 Mortgage  Trustee,
subject to the provisions of the 1993  Mortgage,  for the benefit of the holders
of all securities from time to time outstanding under the 1993 Mortgage, and the
Company shall have no interest therein.

            Any payment by the Company  under the 1993 Mortgage of the principal
of any securities  which shall have been  authenticated  and delivered under the
1993  Mortgage on the basis of the issuance  and  delivery to the 1993  Mortgage
Trustee of  Collateral  Series E Bonds  (other  than by the  application  of the
proceeds of a payment in respect of such  Collateral  Series E Bonds) shall,  to
the extent  thereof,  be deemed to satisfy and discharge  the  obligation of the
Company,  if any, to make a payment of  principal  of such  Collateral  Series E
Bonds which is then due.

            The Trustee may  conclusively  presume  that the  obligation  of the
Company to pay the principal of any Collateral  Series E Bonds as the same shall
become due and payable shall have been fully satisfied and discharged unless and
until it shall have received a written  notice from the 1993  Mortgage  Trustee,
signed by an authorized officer thereof, stating that the principal of specified
Collateral  Series E Bonds has  become  due and  payable  and has not been fully
paid, and specifying the amount of funds required to make such payment.

            Each  Collateral  Series E Bond shall be dated as of the date of its
authentication.

            The  Collateral  Series E Bonds shall be issued as fully  registered
bonds only, in denominations of $1,000 and integral multiples thereof.

            The Collateral Series E Bonds shall be registerable and exchangeable
at the  office  or  agency of the  Company  in the city in which  the  principal
corporate  trust office of the 1993 Mortgage  Trustee is located,  in the manner
and upon the terms  set  forth in  Section  5 of  Article  II of the  Indenture;
provided, however, that the Collateral Series E Bonds shall not be transferrable
except to a successor  trustee under the 1993 Mortgage.  No service charge shall
be made for any exchange or transfer of any Collateral Series E Bond.

            If  and  to  the  extent   necessary  to   eliminate   any  apparent
inconsistency  between any  provision  of this  Supplemental  Indenture  and any
provision  of the  Indenture  all  Collateral  Series  E Bonds  having  the same
Original  Issue  Date,  Stated  Maturity,  interest  rate,  and other  terms and
conditions  shall be deemed to be a separate series of bonds,  and such Original
Issue  Date,  Stated  Maturity,  interest  rate,  if any,  and  other  terms and
conditions shall be deemed to be a part of the designation of such series.

                                       4
<PAGE>

            As used  herein,  the term  "Original  Issue Date" shall mean,  with
respect to any Collateral Series E Bond, the date of authentication and delivery
hereunder of such  Collateral  Series E Bond,  or, in the case of any particular
Collateral  Series E Bond which has been  authenticated  and delivered  upon the
registration  of  transfer  or  exchange  of, or in  substitution  for,  another
Collateral Series E Bond, the date of the original  authentication  and delivery
hereunder of the first  Collateral  Series E Bond  authenticated  and  delivered
hereunder representing all or a portion of the same obligation as that evidenced
by such particular  Collateral  Series E Bond; the term "Stated  Maturity" shall
mean,  with  respect  to any  Collateral  Series E Bond,  the date on which  the
principal  of such  Collateral  Series E Bond is  stated  to be due and  payable
(without  regard  to any  provision  for  acceleration,  redemption  or  similar
provisions);  and the term "Maturity" shall mean, with respect to any Collateral
Series E Bond, the date on which the principal of such Collateral  Series E Bond
becomes  due  and  payable,  whether  at  Stated  Maturity,  by  declaration  of
acceleration, upon call for redemption or otherwise.

            SECTION  2.  The  text of the  Collateral  Series  E Bonds  shall be
substantially in the form attached hereto as Exhibit A.

            SECTION  3. The  Collateral  Series E Bonds may be  executed  by the
Company and delivered to the Trustee and, upon  compliance  with all  applicable
provisions  and  requirements  of the  Indenture  in respect  thereof,  shall be
authenticated  by the  Trustee and  delivered  (without  awaiting  the filing or
recording of this Supplemental Indenture), from time to time, in accordance with
the written order or orders of the Company.


                                  ARTICLE TWO

                  REDEMPTION OF THE COLLATERAL SERIES E BONDS

            SECTION  1. No  Collateral  Series E Bond  shall be  subject  to any
sinking fund or other mandatory  redemption (whether at the option of the holder
thereof or otherwise)  unless  otherwise  specified in the Issuance  Certificate
relating to such Collateral  Series E Bond. Each Collateral  Series E Bond shall
be redeemable at the option of the Company in whole at any time, or in part from
time to time, prior to Stated  Maturity,  at a redemption price equal to 100% of
the principal amount thereof to be redeemed.

            SECTION 2. The  provisions of Sections 3, 4, 5, 6 and 7 of Article V
of the Indenture  shall be applicable to the Collateral  Series E Bonds,  except
that (a) no publication of notice of redemption of the Collateral Series E Bonds
shall be required and (b) if less than all the Collateral  Series E Bonds are to
be redeemed, the Collateral Series E Bonds to be redeemed shall be selected from
the maturities,  and in the principal amounts,  designated to the Trustee by the
Company,  and except as such provisions may otherwise be  inconsistent  with the
provisions of this Article Two.

            SECTION  3. The  holder of each and every  Collateral  Series E Bond
issued  hereunder  hereby  agrees  to  accept  payment  thereof  prior to Stated
Maturity on the terms and conditions provided for in this Article Two.


                                ARTICLE THREE.

                        ACKNOWLEDGMENT OF RIGHT TO VOTE
                          OR CONSENT WITH RESPECT TO
                       CERTAIN AMENDMENTS TO INDENTURE
 
                                      5
<PAGE>

            The  Company  hereby  acknowledges  the right of the  holders of the
Collateral  Series E Bonds to vote or consent  with respect to any or all of the
modifications to the Indenture  referred to in Article Three of the Supplemental
Indenture, dated as of March 1, 1980, irrespective of the fact that the Bonds of
the Second 1987 Series are no longer outstanding;  provided,  however, that such
acknowledgment  shall  not  impair  (a) the  right of the  Company  to make such
modifications without the consent or other action of the holders of the Bonds of
the 2020 Series or the bonds of any other series subsequently  created under the
Indenture with respect to which the Company has expressly reserved such right or
(b) the right of the  Company  to reserve  the right to make such  modifications
without the consent or other  action of the holders of bonds of one or more,  or
any or all, series created subsequent to the creation of the Collateral Series E
Bonds.


                                 ARTICLE FOUR

                                  THE TRUSTEE

            The  Trustee  accepts  the  trusts  created  by  this   Supplemental
Indenture  upon the terms and  conditions  set forth in the  Indenture  and this
Supplemental Indenture.  The recitals in this Supplemental Indenture are made by
the  Company  only and not by the  Trustee.  Each and every  term and  condition
contained  in Article  XII of the  Indenture  shall  apply to this  Supplemental
Indenture with the same force and effect as if the same were herein set forth in
full,  with such  omissions,  variations  and  modifications  thereof  as may be
appropriate to make the same conform to this Supplemental Indenture.


                                 ARTICLE FIVE

                           MISCELLANEOUS PROVISIONS

            SECTION 1.  Subject to the  variations  contained  in Article Two of
this  Supplemental  Indenture,  the  Indenture is in all  respects  ratified and
confirmed and the Principal Indenture, this Supplemental Indenture and all other
indentures  supplemental  to the Principal  Indenture  shall be read,  taken and
construed  as one  and  the  same  instrument.  Neither  the  execution  of this
Supplemental  Indenture  nor  anything  herein  contained  shall be construed to
impair the lien of the Indenture on any of the properties  subject thereto,  and
such lien shall  remain in full force and effect as  security  for all bonds now
outstanding or hereafter issued under the Indenture.

            All covenants and provisions of the Indenture shall continue in full
force  and  effect  and  this  Supplemental  Indenture  shall  form  part of the
Indenture.

            SECTION 2. If the date for  making any  payment or the last date for
performance  of any act or the  exercising  of any right,  as  provided  in this
Supplemental  Indenture,  shall not be a  Business  Day (as  defined in the 1993
Mortgage),  such payment may be made or act performed or right  exercised on the
next  succeeding  Business  Day with the same force and effect as if done on the
nominal date provided in this Supplemental Indenture.

            SECTION  3.  The  terms  defined  in the  Indenture  shall,  for all
purposes  of this  Supplemental  Indenture,  have the meaning  specified  in the
Indenture  except as set forth in  Section 4 of this  Article or  otherwise  set
forth in this  Supplemental  Indenture or unless the context  clearly  indicates
some other meaning to be intended.

            SECTION 4. Any term  defined in Section  303 of the Trust  Indenture
Act of 1939, as amended,  and not otherwise defined in the Indenture shall, with

                                       6
<PAGE>

respect to this  Supplemental  Indenture and the Collateral Series E Bonds, have
the meaning  assigned to such term in Section 303 as in force on the date of the
execution of this Supplemental Indenture.

            SECTION 5. This Supplemental Indenture may be executed in any number
of counterparts, and all of said counterparts executed and delivered, each as an
original, shall constitute but one and the same instrument.

                                       7
<PAGE>


            IN WITNESS WHEREOF, Public Service Company of Colorado, party hereto
of the first part,  has caused its corporate  name to be hereunto  affixed,  and
this  instrument  to be signed by its President or any Vice  President,  and its
corporate  seal to be hereunto  affixed  and  attested  by its  Secretary  or an
Assistant Secretary for and in its behalf; and First Trust of New York, National
Association,  the party hereto of the second part, in evidence of its acceptance
of the trust  hereby  created,  has caused  its  corporate  name to be  hereunto
affixed,  and this  instrument to be signed and its corporate seal to be affixed
by one of its Vice Presidents and attested by one of its Assistant  Secretaries,
for and in its behalf, all as of the day and year first above written.

                                          PUBLIC SERVICE COMPANY OF COLORADO



                                           By: /s/ R. C. Kelly
                                               R. C. Kelly
                                               Senior Vice President,Treasurer,
                                               and Chief Financial Officer

ATTEST: /s/ W. Wayne Brown
              W. Wayne Brown
              Secretary

                                          FIRST TRUST OF NEW YORK,
                                          NATIONAL ASSOCIATION,
                                                 as Trustee


                                          By: /s/ Catherine F. Donohue
                                               Catherine F. Donohue
                                               Vice President


ATTEST:/s/ Alfia Monastra
           Alfia Monastra
           Assistant Secretary


                                       8
<PAGE>


STATE OF COLORADO         )
                          )  ss.:
CITY AND COUNTY OF DENVER )


        On this 26th day of February,  1997, before me, Marilyn Albaitis, a duly
authorized Notary Public in and for said City and County in the State aforesaid,
personally  appeared R. C. Kelly and W. Wayne Brown,  to me known to be a Senior
Vice President and the  Secretary,  respectively,  of PUBLIC SERVICE  COMPANY OF
COLORADO,  a corporation  organized and existing  under the laws of the State of
Colorado,  one of the  corporations  that  executed  the  within  and  foregoing
instrument; and the said R. C. Kelly and W. Wayne Brown, severally, acknowledged
the  said  instrument  to be the  free  and  voluntary  act  and  deed  of  said
corporation,  for the uses and purposes  therein  mentioned,  and on oath stated
that they were  authorized to execute said  instrument and that the seal affixed
thereto is the corporate seal of said corporation.

        IN WITNESS WHEREOF,  I have hereunto set my hand and affixed my official
seal the day and year first above written.



                                   /s/ Marilyn Albaitis
                                        Marilyn Albaitis
                                        Notary Public, State of Colorado
                                        Commission Expires September 21, 2000



                                       9
<PAGE>


STATE OF NEW YORK            )
                             )  ss.:
CITY AND COUNTY OF NEW YORK  )


        On this 26th day of February,  1997,  before me,  Joanne E. Ilse, a duly
authorized Notary Public in and for said City and County in the State aforesaid,
personally appeared Catherine F. Donohue and Alfia Monastra, to me known to be a
Vice President and an Assistant Secretary,  respectively,  of First TRUST OF NEW
YORK,  National  Association,  a  national  banking  association,   one  of  the
corporations  that  executed the within and foregoing  instrument;  and the said
Catherine  F.  Donohue  and Alfia  Monastra,  severally,  acknowledged  the said
instrument to be the free and voluntary  act and deed of said  corporation,  for
the uses and  purposes  therein  mentioned,  and on oath  stated  that they were
authorized to execute said  instrument and that the seal affixed  thereto is the
corporate seal of said corporation.

        IN WITNESS WHEREOF,  I have hereunto set my hand and affixed my official
seal the day and year first above written.


                                    /s/ Joanne E. Ilse
                                    Joanne E. Ilse
                                    Notary Public, State of New York
                                    Commission Expires October 4, 1997



                                       10
<PAGE>


                                                                     EXHIBIT A



                       FORM OF COLLATERAL SERIES E BOND

        This bond is not  transferable  except to a successor  trustee under the
Indenture, dated as of October 1, 1993, as supplemented,  between Public Service
Company of Colorado and First Trust of New York, National
Association, as successor trustee thereunder.


                      PUBLIC SERVICE COMPANY OF COLORADO

                             FIRST MORTGAGE BOND,

                              CoLLATERAL SERIES E



REGISTERED                                                          REGISTERED


No..................                                       $..................

                      Original Issue Date:
                      Stated Maturity:
                      Other/Additional Provisions:
                      Addendum Attached
                             [  ] Yes
                             [  ] No


        FOR VALUE RECEIVED,  PUBLIC SERVICE  COMPANY OF COLORADO,  a corporation
organized  and  existing  under the laws of the State of  Colorado  (hereinafter
sometimes  called the  "Company"),  promises  to pay to First Trust of New York,
National  Association,  as successor trustee (the "1993 Mortgage Trustee") under
the  Indenture,  dated as of  October  1, 1993  (the  "1993  Mortgage"),  of the
Company, or registered assigns,


Dollars on the Stated  Maturity  specified above (unless this bond shall then be
deemed to have been paid in  accordance  with the  provisions  of the  Indenture
referred  to below) at the office or agency of the  Company in the city in which
the principal  corporate  trust office of the 1993 Mortgage  Trustee is located.
This bond shall not bear  interest.  The principal of this bond shall be payable
in any coin or  currency  of the United  States of America  which at the time of
payment shall be legal tender for the payment of public and private debts.

        Any payment by the Company  under the 1993  Mortgage of the principal of
securities  which shall have been  authenticated  and  delivered  under the 1993
Mortgage on the basis of the issuance and delivery to the 1993 Mortgage  Trustee
of this bond (the "1993 Mortgage  Securities") (other than by the application of
the proceeds of a payment in respect of this bond) shall, to the extent thereof,
be deemed to satisfy and  discharge the  obligation  of the Company,  if any, to
make a payment of principal of this bond which is then due.


                                      A-1
<PAGE>

        If an Addendum is attached hereto or "Other/Additional Provisions" apply
to this bond, this bond shall be subject to the terms set forth in such Addendum
or such "Other/Additional Provisions".

        This bond is one of an issue of bonds of the  Company,  issued and to be
issued in one or more series  under and equally and ratably  secured  (except as
any sinking, amortization,  improvement or other fund, established in accordance
with  the  provisions  of  the  indenture  hereinafter  mentioned,   may  afford
additional  security  for the  bonds  of any  particular  series)  by a  certain
indenture,  dated as of December 1, 1939,  made by the Company to First Trust of
New York,  National  Association,  as successor trustee  (hereinafter called the
"Trustee"),  to Morgan  Guaranty  Trust Company of New York  (formerly  Guaranty
Trust Company of New York), as amended and  supplemented  by several  indentures
supplemental thereto,  including the Supplemental Indenture dated as of February
1,  1997  (said  Indenture  as  amended  and  supplemented  by  said  indentures
supplemental  thereto  being  hereinafter  called  the  "Indenture"),  to  which
Indenture  reference is hereby made for a description of the property mortgaged,
the nature and extent of the security,  the rights and  limitations of rights of
the Company,  the Trustee,  and the holders of said bonds,  under the Indenture,
and the terms and  conditions  upon which said bonds are secured,  to all of the
provisions of which  Indenture  and of all  indentures  supplemental  thereto in
respect of such security,  including the provisions of the Indenture  permitting
the issue of bonds of any series for property which,  under the restrictions and
limitations therein specified,  may be subject to liens prior to the lien of the
Indenture,  the holder, by accepting this bond, assents. To the extent permitted
by and as provided in the Indenture,  the rights and  obligations of the Company
and of the holders of said bonds  (including  those pertaining to any sinking or
other fund) may be changed and modified, with the consent of the Company, by the
holders  of at  least  75% in  aggregate  principal  amount  of the  bonds  then
outstanding (excluding bonds disqualified from voting by reason of the Company's
interest therein as provided in the Indenture);  provided, however, that without
the consent of the holder hereof no such  modification  or  alteration  shall be
made which will  extend  the time of  payment of the  principal  of this bond or
reduce the principal amount hereof or effect any other modification of the terms
of payment of such principal or will reduce the percentage of bonds required for
the aforesaid actions under the Indenture. The Company has reserved the right to
amend the Indenture without any consent or other action by holders of any series
of bonds created after October 31, 1975  (including this series) so as to change
75% in the foregoing sentence to 60% and to change certain  procedures  relating
to bondholders'  meetings.  This bond is one of a series of bonds  designated as
the First Mortgage Bonds, Collateral Series E, of the Company.

        Unless otherwise  specified in an Addendum  attached  hereto,  this bond
shall not be subject to any sinking fund or other mandatory  redemption (whether
at the option of the holder hereof or otherwise).  This bond shall be redeemable
at the option of the Company in whole at any time, or in part from time to time,
prior to the Stated Maturity  specified  above,  at a redemption  price equal to
100% of the principal amount thereof to be redeemed.

        The  principal of this bond may be declared or may become due before the
Stated Maturity  specified  above,  on the conditions,  in the manner and at the
times set forth in the  Indenture,  upon the happening of an event of default as
therein provided.
        This bond is not  transferable  except to a successor  trustee under the
1993  Mortgage,  any such  transfer  to be made at the  office  or agency of the
Company in the city in which the  principal  corporate  trust office of the 1993
Mortgage  Trustee is located,  upon surrender and cancellation of this bond, and
thereupon  a new bond of this series of a like  principal  amount and having the
same Original Issue Date,  Stated Maturity and other terms and conditions,  will
be issued to the transferee in exchange therefor,  as provided in the Indenture.
The Company,  the Trustee, any paying agent and any registrar may deem and treat
the person in whose name this bond is  registered  as the absolute  owner hereof
for the  purpose of  receiving  payment and for all other  purposes.  This bond,
alone or with other bonds of this  series,  may in like manner be  exchanged  at

                                      A-2
<PAGE>

such  office  or  agency  for one or more new  bonds of this  series of the same
aggregate  principal  amount,  and having the same Original  Issue Date,  Stated
Maturity, and other terms and conditions,  all as provided in the Indenture.  No
service  charge  shall be made to any holder of any bond of this  series for any
exchange or transfer of bonds.

        No recourse  under or upon any covenant or obligation of the  Indenture,
or of any bonds thereby secured, or for any claim based thereon, or otherwise in
any manner in respect thereof, shall be had against any incorporator, subscriber
to the capital stock, shareholder, officer or director, as such, of the Company,
whether former,  present or future,  either directly,  or indirectly through the
Company or the Trustee, by the enforcement of any subscription to capital stock,
assessment  or otherwise,  or by any legal or equitable  proceeding by virtue of
any statute or otherwise  (including,  without  limiting the  generality  of the
foregoing,  any proceeding to enforce any claimed  liability of  shareholders of
the Company based upon any theory of  disregarding  the corporate  entity of the
Company  or upon  any  theory  that  the  Company  was  acting  as the  agent or
instrumentality   of  the   shareholders),   any  and  all  such   liability  of
incorporators, shareholders, subscribers, officers and directors, as such, being
released  by the  holder  hereof,  by the  acceptance  of this  bond,  and being
likewise waived and released by the terms of the Indenture under which this bond
is issued.

        This bond shall not be valid or become  obligatory for any purpose until
the  certificate  of  authentication  endorsed  hereon shall have been signed by
First Trust of New York,  National  Association,  or its  successor,  as Trustee
under the Indenture.


                                      A-3
<PAGE>



        IN WITNESS  WHEREOF,  Public Service Company of Colorado has caused this
bond to be  signed  in its name by the  facsimile  signature  of a  Senior  Vice
President  and its  corporate  seal to be  imprinted  hereon and attested by the
facsimile signature of its Secretary.

Dated:                                  PUBLIC SERVICE COMPANY OF
                                        COLORADO



                                        By:
                                             Senior Vice President

ATTEST:________________________
              Secretary





                         CERTIFICATE OF AUTHENTICATION


        This is one of the securities of the series designated  therein referred
to in the within-mentioned Supplemental Indenture.

Dated:                                  FIRST TRUST OF NEW YORK,
                                        NATIONAL ASSOCIATION,
                                             AS TRUSTEE



                                        By:
                                             Authorized Officer


                                      A-4
<PAGE>


                                                                    SCHEDULE A


                            SUPPLEMENTAL INDENTURES


     Date of                                                     Principal
  Supplemental                                   Principal        Amount
    Indenture           Series of Bonds        Amount Issued    Outstanding
    ---------           ---------------        -------------    -----------

March 14, 1941               None                   --              --

May 14, 1941                 None                   --              --

April 28, 1942               None                   --              --

April 14, 1943               None                   --              --

April 27, 1944               None                   --              --

April 18, 1945               None                   --              --

April 23, 1946               None                   --              --

April 9, 1947                None                   --              --

June 1, 1947*       2-7/8% Series due 1977     $ 40,000,000        None

April 1, 1948                None                   --              --

May 20, 1948                 None                   --              --

October 1, 1948     3-1/8% Series due 1978        10,000,000       None

April 20, 1949               None                   --              --

April 24, 1950               None                   --              --

April 18, 1951               None                   --              --

October 1, 1951     3-1/4% Series due 1981        15,000,000       None

April 21, 1952               None                   --              --

December 1, 1952             None                   --              --

April 15, 1953               None                   --              --

April 19, 1954               None                   --              --

October 1, 1954*    3-1/8% Series due 1984        20,000,000       None

April 18, 1955               None                   --              --

April 24, 1956               None                   --              --

May 1, 1957*        4-3/8% Series due 1987        30,000,000       None

April 10, 1958               None                   --              --

May 1, 1959         4-5/8% Series due 1989        20,000,000       None

April 18, 1960               None                   --              --

April 19, 1961               None                   --              --


                                      I-1

<PAGE>

     Date of                                                     Principal
  Supplemental                                   Principal        Amount
    Indenture           Series of Bonds        Amount Issued    Outstanding
    ---------           ---------------        -------------    -----------

October 1, 1961     4-1/2% Series due 1991        30,000,000       None

March 1, 1962       4-5/8% Series due 1992         8,800,000       None

June 1, 1964        4-1/2% Series due 1994        35,000,000       None

May 1, 1966         5-3/8% Series due 1996        35,000,000       None

July 1, 1967*       5-7/8% Series due 1997        35,000,000     35,000,000

July 1, 1968*       6-3/4% Series due 1998        25,000,000     25,000,000

April 25, 1969               None                   --              --

April 21, 1970               None                   --              --

September 1, 1970   8-3/4% Series due 2000        35,000,000        None

February 1, 1971    7-1/4% Series due 2001        40,000,000       None

August 1, 1972      7-1/2% Series due 2002        50,000,000       None

June 1, 1973        7-5/8% Series due 2003        50,000,000       None

March 1, 1974     Pollution Control Series A      24,000,000    22,500,000

December 1, 1974  Pollution Control Series B      50,000,000       None

October 1, 1975     9-3/8% Series due 2005        50,000,000       None

April 28, 1976               None                   --              --

April 28, 1977               None                   --              --

November 1, 1977*   8-1/4% Series due 2007        50,000,000        None

April 28, 1978               None                   --              --

October 1, 1978     9-1/4% Series due 2008        50,000,000       None

October 1, 1979*  Pollution Control Series C      50,000,000       None

March 1, 1980*        15% Series due 1987         50,000,000       None

April 28, 1981               None                   --              --

November 1, 1981* Pollution Control Series D      27,380,000       None

December 1, 1981*   16-1/4% Series due 2011       50,000,000       None

April 29, 1982               None                   --              --

May 1, 1983*      Pollution Control Series E      42,000,000       None

April 30, 1984               None                   --              --

March 1, 1985*        13% Series due 2015         50,000,000       None

November 1, 1986* Pollution Control Series F      27,250,000     27,250,000


                                      I-2
<PAGE>

     Date of                                                     Principal
  Supplemental                                   Principal        Amount
    Indenture           Series of Bonds        Amount Issued    Outstanding
    ---------           ---------------        -------------    -----------

May 1, 1987*         8.95% Series due 1992        75,000,000        None

July 1, 1990*       9-7/8% Series due 2020        75,000,000     75,000,000

December 1, 1990* Secured Medium-Term Notes,   191,500,000**    108,500,000
                           Series A

March 1, 1992*    8-1/8% Series due 2004 and    100,000,000     100,000,000
                    8-3/4% Series due 2022      150,000,000     150,000,000

April 1, 1993*    Pollution Control Series G     79,500,000      79,500,000

June 1, 1993*     Pollution Control Series H     50,000,000      50,000,000

November 1, 1993*     Collateral Series A       134,500,000     134,500,000


January 1, 1994*  Collateral Series B due 2001  102,667,000     102,667,000
                  Collateral Series B due 2004  110,000,000     110,000,000

September 2, 1994       (appointment of            None            None
                      successor trustee)

May 1, 1996*          Collateral Series C        125,000,000     125,000,000
                          due 2006
                      
November 1, 1996*  Collateral Series D due from  150,000,000***  150,000,000
                     9 months to 30 years
                      from date of issue


- ----------------------
* Contains amendatory provisions
** $200,000,000 authorized
*** $250,000,000 authorized



                                      I-3

<PAGE>

                                                                     SCHEDULE B

                              PROPERTY DESCRIPTION

                                   PART SECOND

                                  (SUBSTATIONS)

The  following  electric  substations  and  substation  sites  of  the  Company,
including all buildings,  structures,  towers,  poles, lines, and all equipment,
appliances and devices for  transforming,  converting and distributing  electric
energy,  and all the right, title and interest of the Company in and to the land
on which  the same are  situated,  and all of the  Company's  lands,  easements,
rights-of-way, rights, franchises, privileges, machinery, equipment, appliances,
devices, appurtenances and supplies forming a part of said substations or any of
them, or used or enjoyed, or capable of being used or enjoyed, in conjunction or
connection  with any  thereof,  all  situated in the State of  Colorado  and the
counties thereof, more particularly described as follows:

                                 ARAPAHOE COUNTY

1.     QUINCY SUBSTATION

A parcel of land  located in the SW 1/4  Section 5,  Township 5 South,  Range 64
West of the 6th Principal Meridian, Arapahoe County, Colorado, more particularly
described as follows:

Commencing  at the SE corner of said SW 1/4  Section 5;  Whence the SW corner of
said Section 5 bears N 89 Degrees 42'59" W a distance of 2,635.92 feet; Thence N
89 Degrees  42'59" W along the South line of said SW 1/4 Section 5 a distance of
350.00 feet to a point; Thence N 00 Degrees 17'01" E a distance of 55.00 feet to
a point on the North line of County Road 30 (Quincy Avenue) as described in Book
2826, Page 722, Reception No. 1761586,  Arapahoe County Clerk and Recorder, also
being the true point of  beginning;  Thence  along the North Line of said County
Road 30 (Quincy  Avenue),  N 89 Degrees  42'59" W a distance of 190.00 feet to a
point;  Thence N 00 Degrees 17'01"E a distance of 455.00 feet to a point; Thence
S 89 Degrees 42'59" E a distance of 190.00 feet to a point;  Thence S 00 Degrees
17'01" W a  distance  of  455.00  feet to the  point  of  beginning,  County  of
Arapahoe, State of Colorado

<PAGE>
                                                            EXHIBIT 4(b)








                            PUBLIC SERVICE COMPANY
                                  OF COLORADO


                                      TO


                           FIRST TRUST OF NEW YORK,
                             NATIONAL ASSOCIATION,


                                                    as Trustee


                             ---------------------



                         Supplemental Indenture No. 6

                         Dated as of February 1, 1997


                         Supplemental to the Indenture
                          dated as of October 1, 1993


                             ---------------------


                  Establishing the Securities of Series No. 5
                designated Secured Medium-Term Notes, Series C






<PAGE>


      SUPPLEMENTAL INDENTURE NO. 6, dated as of February 1, 1997, between PUBLIC
SERVICE COMPANY OF COLORADO, a corporation duly organized and existing under the
laws of the State of Colorado (hereinafter sometimes called the "Company"),  and
FIRST TRUST OF NEW YORK,  NATIONAL  ASSOCIATION,  a national banking association
(hereinafter  sometimes  called the "Trustee"),  as successor  trustee to Morgan
Guaranty Trust Company of New York under the  Indenture,  dated as of October 1,
1993 (hereinafter called the "Original Indenture"),  as previously  supplemented
and as further  supplemented by this Supplemental  Indenture No. 6. The Original
Indenture and any and all indentures and other instruments  supplemental thereto
are hereinafter sometimes collectively called the "Indenture".

                            Recitals of the Company

      The Original  Indenture  was  authorized,  executed  and  delivered by the
Company to provide for the issuance  from time to time of its  Securities  (such
term and all other capitalized  terms used herein without  definition having the
meanings  assigned to them in the  Original  Indenture),  to be issued in one or
more series as contemplated  therein, and to provide security for the payment of
the principal of and premium, if any, and interest, if any, on the Securities.

      The Company  has  heretofore  executed  and  delivered  to the Trustee the
Supplemental  Indentures  referred  to in  Schedule A hereto for the  purpose of
establishing various series of bonds and of appointing the successor trustee.

      The Company  desires to establish a series of  Securities to be designated
"Secured  Medium-Term Notes, Series C", being a series of First Collateral Trust
Bonds, such series of Securities to be hereinafter  sometimes called "Series No.
5".

      The Company has duly authorized the execution and delivery of this
Supplemental Indenture No. 6 to establish the Securities of Series No. 5 and
has duly authorized the issuance of such Securities; and all acts necessary
to make this Supplemental Indenture No. 6 a valid agreement of the Company,
and to make the Securities of Series No. 5 valid obligations of the Company,
have been performed.

                               Granting Clauses

      NOW,  THEREFORE,  THIS SUPPLEMENTAL  INDENTURE NO. 6 WITNESSETH,  that, in
consideration  of the  premises  and of the  purchase of the  Securities  by the
Holders  thereof,  and in order to secure the  payment of the  principal  of and
premium,  if any,  and  interest,  if any, on all  Securities  from time to time
Outstanding  and the performance of the covenants  contained  therein and in the
Indenture and to declare the terms and  conditions on which such  Securities are
secured, the Company hereby grants, bargains, sells, releases, conveys, assigns,
transfers, mortgages, pledges, sets over and confirms to the Trustee, and grants
to the Trustee a security interest in, the following:

                             Granting Clause First
 
            All right, title and interest of the Company,  as of the date of the
      execution  and delivery of this  Supplemental  Indenture  No. 6, in and to
      property  (other than  Excepted  Property),  real,  personal and mixed and
      wherever situated, in any case used or to be used in or in connection with
      the Electric Utility Business  (whether or not such use is the sole use of
      such property),  including without  limitation (a) all lands and interests
      in land  described  or  referred  to in  Schedule B hereto;  (b) all other
      lands, easements,  servitudes,  licenses, permits, rights of way and other
      rights and interests in or relating to real property used or to be used in
      or in  connection  with the Electric  Utility  Business or relating to the
      occupancy or use of such real property, subject however, to the exceptions

<PAGE>

      and  exclusions  set forth in clause (a) of Granting  Clause  First of the
      Original  Indenture;  (c)  all  plants,  generators,   turbines,  engines,
      boilers,  fuel  handling  and  transportation  facilities,  air and  water
      pollution control and sewage and solid waste disposal facilities and other
      machinery and facilities for the  generation of electric  energy;  (d) all
      switchyards, lines, towers, substations,  transformers and other machinery
      and facilities for the  transmission  of electric  energy;  (e) all lines,
      poles, conduits,  conductors,  meters,  regulators and other machinery and
      facilities for the  distribution  of electric  energy;  (f) all buildings,
      offices,  warehouses  and  other  structures  used  or to be used in or in
      connection  with the Electric  Utility  Business;  (g) all pipes,  cables,
      insulators,  ducts,  tools,  computers  and other data  processing  and/or
      storage equipment and other equipment, apparatus and facilities used or to
      be used in or in connection with the Electric Utility Business; (h) any or
      all of the foregoing  properties in the process of  construction;  and (i)
      all other property, of whatever kind and nature, ancillary to or otherwise
      used or to be used in  conjunction  with  any or all of the  foregoing  or
      otherwise,  directly or indirectly, in furtherance of the Electric Utility
      Business;

                            Granting Clause Second

            Subject to the applicable  exceptions  permitted by Section  810(c),
      Section  1303 and Section  1305 of the  Original  Indenture,  all property
      (other  than  Excepted  Property)  of the kind  and  nature  described  in
      Granting Clause First which may be hereafter  acquired by the Company,  it
      being the intention of the Company that all such property  acquired by the
      Company after the date of the execution and delivery of this  Supplemental
      Indenture  No. 6 shall be as fully  embraced  within and  subjected to the
      Lien hereof as if such  property  were owned by the Company as of the date
      of the execution and delivery of this Supplemental Indenture No. 6;

                            Granting Clause Fourth

            All other property of whatever kind and nature subjected or required
      to be  subjected  to the Lien of the  Indenture  by any of the  provisions
      thereof;

                               Excepted Property

            Expressly  excepting  and  excluding,  however,  from  the  Lien and
      operation of the Indenture all Excepted  Property of the Company,  whether
      now owned or hereafter acquired;

      TO HAVE AND TO HOLD all such property,  real, personal and mixed, unto the
Trustee, its successors in trust and their assigns forever;

      SUBJECT,  HOWEVER,  to (a) Liens existing at the date of the execution and
delivery of the Original Indenture  (including,  but not limited to, the Lien of
the PSCO 1939  Mortgage),  (b) as to property  acquired by the Company after the
date of the execution and delivery of the Original Indenture,  Liens existing or
placed  thereon  at the  time of the  acquisition  thereof  (including,  but not
limited to, the Lien of any Class A Mortgage  and  purchase  money  Liens),  (c)
Retained  Interests and (d) any other Permitted Liens, it being understood that,
with respect to any property  which was at the date of execution and delivery of
the Original  Indenture or thereafter became or hereafter becomes subject to the
Lien of any Class A Mortgage,  the Lien of the  Indenture  shall at all times be
junior, subject and subordinate to the Lien of such Class A Mortgage;

                                       2
<PAGE>

      IN  TRUST,  NEVERTHELESS,  for the  equal and  proportionate  benefit  and
security of the Holders from time to time of all Outstanding  Securities without
any priority of any such Security over any other such Security;

      PROVIDED,  HOWEVER,  that the right,  title and interest of the Trustee in
and to the  Mortgaged  Property  shall  cease,  terminate  and  become  void  in
accordance with, and subject to the conditions set forth in, Article Nine of the
Original  Indenture,  and if, thereafter,  the principal of and premium, if any,
and  interest,  if any,  on the  Securities  shall have been paid to the Holders
thereof,  or shall have been paid to the Company  pursuant to Section 603 of the
Original Indenture, then and in that case the Indenture shall terminate, and the
Trustee shall execute and deliver to the Company such instruments as the Company
shall require to evidence such  termination;  otherwise the  Indenture,  and the
estate and rights thereby granted, shall be and remain in full force and effect;
and

      THE PARTIES HEREBY FURTHER COVENANT AND AGREE as follows:

                                  ARTICLE ONE

                          Securities of Series No. 5

      There are hereby  established  the Securities of Series No. 5, which shall
have the terms and  characteristics  set forth below (the lettered  subdivisions
set forth below corresponding to the lettered subdivisions of Section 301 of the
Original Indenture):

     (a)  the  title  of  the  Securities  of  such  series  shall  be  "Secured
     Medium-Term  Notes,  Series C",  being a series of First  Collateral  Trust
     Bonds;  provided,  however,  that, at any time after the PSCO 1939 Mortgage
     shall have been satisfied and discharged, the Company shall have the right,
     without any consent or other action by the Holders of such  Securities,  to
     change  such title in such  manner as shall be deemed by the  Company to be
     appropriate to reflect such  satisfaction and discharge,  such change to be
     evidenced in an Officer's Certificate;

      (b)   there shall be no limit upon the aggregate principal amount
      of the Securities of Series No. 5 which may be authenticated and
      delivered under the Indenture.  The Securities of Series No. 5
      shall be initially authenticated and delivered from time to time
      in the aggregate principal amount of up to $150,000,000;

      (c)  interest  on the  Securities  of Series No. 5 shall be payable to the
      Persons in whose  names such  Securities  are  registered  at the close of
      business on the Regular Record Date for such interest, except as otherwise
      expressly  provided  in the form of such  Security  attached  as Exhibit A
      hereto;

      (d)   the principal of each Security of Series No. 5 shall be
      payable on such date as is specified in the Officer's Certificate
      applicable to such Security;

      (e) an Officer's Certificate with respect to each Security of Series No. 5
      shall  specify the rate at which such  Security of Series No. 5 shall bear
      interest,  the date from which interest shall accrue, the Interest Payment
      Dates if other than  February 1 and August 1 of each year and the  Regular
      Record  Dates with  respect to the  Interest  Payment  Dates if other than
      January 15 and July 15;

      (f) the  Corporate  Trust  Office  of First  Trust of New  York,  National

                                       3
<PAGE>

      Association,  in New  York,  New York  shall be the place at which (i) the
      principal of, premium, if any, and interest,  if any, on the Securities of
      Series No. 5 shall be  payable,  (ii)  registration  of  transfer  of such
      Securities  may be effected,  (iii)  exchanges of such  Securities  may be
      effected and (iv) notices and demands to or upon the Company in respect of
      such  Securities  and the Indenture may be served;  and First Trust of New
      York,  National  Association,  shall  be the  Security  Registrar  for the
      Securities;  provided,  however,  that the Company  reserves  the right to
      change,  by one or more  Officer's  Certificates,  any  such  place or the
      Security Registrar;  and provided,  further, that the Company reserves the
      right to designate, by one or more Officer's  Certificates,  its principal
      office in Denver,  Colorado  as any such  place or itself as the  Security
      Registrar;

      (g)   each Security of Series No. 5 shall be redeemable only if
      and to the extent specified in the Officer's Certificate
      applicable to such Security of Series No. 5;

      (h)   not applicable to any Security of Series No. 5, except to the
      extent specified in the Officer's Certificate applicable to a
      particular Security of Series No. 5;

      (i)   the Securities of Series No. 5 shall be issuable in denominations
      of $100,000 and any greater amount which is an integral multiple of
      $1,000;

      (j)   not applicable;

      (k)   not applicable;

      (l)   not applicable;

      (m)   not applicable;

      (n)   not applicable to any Security of Series No. 5, except to the
      extent specified in the Officer's Certificate applicable to a
      particular Security of Series No. 5;

      (o)   not applicable;

      (p)   not applicable;

      (q) each  Security of Series No. 5 is to be  initially  registered  in the
      name of Cede & Co.,  as nominee  for The  Depository  Trust  Company  (the
      "Depositary"). The Securities of Series No. 5 shall not be transferable or
      exchangeable,  nor shall any purported  transfer be registered,  except as
      follows:

            (i) a Security  of Series  No. 5 may be  transferred  in whole,  and
            appropriate  registration of transfer effected,  if such transfer is
            by such nominee to the  Depositary,  or by the Depositary to another
            nominee  thereof,  or by any nominee of the  Depositary to any other
            nominee thereof,  or by the Depositary or any nominee thereof to any
            successor securities depositary or any nominee thereof; and

            (ii)  a Security of Series No. 5 may be exchanged for
            certificated notes registered in the respective names of the
            beneficial holders thereof, and thereafter shall be transferable
            without restriction, if:

                  (A) The Depositary,  or any successor  securities  depositary,
                  shall have  notified  the Company  and the Trustee  that it is

                                       4
<PAGE>
                  unwilling   or  unable  to  continue  to  act  as   securities
                  depositary  with  respect to such  Security of Series No. 5 or
                  the Company becomes aware that the Depositary has ceased to be
                  a clearing agency registered under the Securities Exchange Act
                  of 1934, as amended,  and, in any such case, the Trustee shall
                  not have been notified by the Company  within ninety (90) days
                  of the  identity of a  successor  securities  depositary  with
                  respect to such Security of Series No. 5;

                  (B) The Company shall have  delivered to the Trustee a Company
                  Order to the effect  that such  Security of Series No. 5 shall
                  be so exchangeable on and after a date specified therein; or

                  (C)  (1) an  Event  of  Default  shall  have  occurred  and be
                  continuing,  (2) the Trustee  shall have given  notice of such
                  Event of  Default  pursuant  to Section  1102 of the  Original
                  Indenture  and (3)  there  shall  have been  delivered  to the
                  Company  and the  Trustee  an Opinion of Counsel to the effect
                  that the interests of the  beneficial  owners of such Security
                  of Series No. 5 in respect thereof will be materially impaired
                  unless such owners become Holders of certificated notes.

      (r)   not applicable;

      (s) no service  charge shall be made for the  registration  of transfer or
      exchange of any  Securities  of Series No. 5 provided,  however,  that the
      Company may require  payment of a sum sufficient to cover any tax or other
      governmental  charge  payable  in  connection  with any such  exchange  or
      transfer;

      (t)   not applicable;

      (u)   (i)   If the Company shall have caused the Company's indebtedness
            in respect of any Security of Series No. 5 to have been satisfied
            and discharged prior to the Maturity of such Security of Series
            No. 5, as provided in Section 901 of the Original Indenture, the
            Company shall, promptly after the date of such satisfaction and
            discharge, give a notice to each Person who was a Holder of any
            such Security of Series No. 5 on such date stating (A)(1) the
            aggregate principal amount of such Security of Series No. 5 and
            (2) the aggregate amount of any money (other than amounts, if
            any, deposited in respect of accrued interest on such Security of
            Series No. 5) and the aggregate principal amount of, the rate or
            rates of interest on, and the aggregate fair market value of, any
            Eligible Obligations deposited pursuant to Section 901 of the
            Original Indenture with respect to such Security of Series No. 5
            and (B) that the Company will provide (and the Company shall
            promptly so provide) to such Person, or any beneficial owner of
            such Security of Series No. 5 holding through such Person (upon
            written request to the Company sent to an address specified in
            such notice), such other information as such Person or beneficial
            owner, as the case may be, reasonably may request in order to
            enable it to determine the federal income tax consequences to it
            resulting from the satisfaction and discharge of the Company's
            indebtedness in respect of such Security of Series No. 5.
            Thereafter, the Company shall, within forty-five (45) days after
            the end of each calendar year, give to each Person who at any
            time during such calendar year was a Holder of such Security of
            Series No. 5 a notice containing (X) such information as may be
            necessary to enable such Person to report its income, gain or
            loss for federal income tax purposes with respect to such
            Security of Series No. 5 or the assets held on deposit in respect
            thereof during such calendar year or the portion thereof during

                                       5
<PAGE>

            which such Person was a Holder of such Security of Series No. 5,
            as the case may be (such information to be set forth for such
            calendar year as a whole and for each month during such year) and
            (Y) a statement to the effect that the Company will provide (and
            the Company shall promptly so provide) to such Person, or any
            beneficial owner of such Security of Series No. 5 holding through
            such Person (upon written request to the Company sent to an
            address specified in such notice), such other information as such
            Person or beneficial owner, as the case may be, reasonably may
            request in order to enable it to determine its income, gain or
            loss for federal income tax purposes with respect to such
            Security of Series No. 5 or such assets for such year or portion
            thereof, as the case may be.  The obligation of the Company to
            provide or cause to be provided information for purposes of
            income tax reporting by any Person as described in the first two
            sentences of this paragraph shall be deemed to have been
            satisfied to the extent that the Company has provided or caused
            to be provided substantially comparable information pursuant to
            any requirements of the Internal Revenue Code of 1986, as amended
            from time to time (the "Code"), and United States Treasury
            regulations thereunder.

            (ii)  Notwithstanding  the provisions of subparagraph (i) above, the
            Company  shall not be required to give any notice  specified in such
            subparagraph  or  to  otherwise   furnish  any  of  the  information
            contemplated  therein if the  Company  shall have  delivered  to the
            Trustee an Opinion of Counsel to the effect  that the Holder of such
            Security of Series No. 5 will not recognize income, gain or loss for
            federal  income tax  purposes  as a result of the  satisfaction  and
            discharge of the Company's  indebtedness in respect of such Security
            of Series No. 5 and such  Holder  will be subject to federal  income
            taxation on the same  amounts and in the same manner and at the same
            times as if such satisfaction and discharge had not occurred.

            (iii)  Anything in this clause (u) to the contrary  notwithstanding,
            the Company  shall not be required to give any notice  specified  in
            subparagraph   (i)  or  to   otherwise   furnish   the   information
            contemplated   therein  or  to  deliver   any   Opinion  of  Counsel
            contemplated by  subparagraph  (ii) if the Company shall have caused
            the  applicable  Security  of Series No. 5 to be deemed to have been
            paid for  purposes of the  Indenture,  as provided in Section 901 of
            the Original Indenture, but shall not have effected the satisfaction
            and  discharge of its  indebtedness  in respect of such  Security of
            Series No. 5 pursuant to such Section.

      (v) each  Security  of  Series  No. 5 shall be  substantially  in the form
      attached as Exhibit A hereto and shall have such further  terms as are set
      forth in such form.

                                  ARTICLE TWO

                           Miscellaneous Provisions

      This Supplemental Indenture No. 6 is a supplement to the Original
Indenture.  As previously supplemented and further supplemented by this
Supplemental Indenture No. 6, the Original Indenture is in all respects
ratified, approved and confirmed, and the Original Indenture, all previous
supplements thereto and this Supplemental Indenture No. 6 shall together
constitute one and the same instrument.

            IN WITNESS WHEREOF, the parties hereto have caused this Supplemental
Indenture No. 6 to be duly executed as of the day and year first above written.

                                       6


<PAGE>

                                          PUBLIC SERVICE COMPANY OF COLORADO


                                            By: /s/ R. C. Kelly
                                               R. C. Kelly
                                               Senior Vice President, Treasurer,
                                                and Chief Financial Officer



                                          FIRST TRUST OF NEW YORK,
                                            NATIONAL ASSOCIATION, Trustee


                                          By:  /s/ Catherine F. Donohue
                                               Catherine F. Donohue
                                                Vice President



                                       7
<PAGE>


STATE OF COLORADO                   )
                                    ) ss.:
CITY AND COUNTY OF DENVER           )


            On the 26th day of February,  1997,  before me personally came R. C.
Kelly, to me known, who, being by me duly sworn, did depose and say that he is a
Senior  Vice  President  of  Public  Service  Company  of  Colorado,  one of the
corporations described in and which executed the foregoing instrument;  and that
he signed  his name  thereto  by  authority  of the Board of  Directors  of said
corporation.


                                   /s/ Marilyn Albaitis
                                   Marilyn Albaitis
                                   Notary Public, State of Colorado
                                   Commission Expires September 21, 2000


                                       8

<PAGE>


STATE OF NEW YORK                   )
                                    ) ss.:
CITY AND COUNTY OF NEW YORK         )


            On the  26th  day of  February,  1997,  before  me  personally  came
Catherine F. Donohue,  to me known,  who, being by me duly sworn, did depose and
say  that  she is a  Vice  President  of  First  Trust  of  New  York,  National
Association,  the national banking  association  described in and which executed
the foregoing  instrument;  and that she signed her name thereto by authority of
the Board of Directors of said national banking association.


                                  /s/ Joanne E. Ilse
                                  Joanne E. Ilse
                                  Notary Public, State of New York
                                  Commission Expires October 4, 1997


                                       9

<PAGE>

                                                                    EXHIBIT A
                               FORM OF SECURITY


                  (See legend at the end of this Security for
                 restrictions on transfer and change of form)


                      PUBLIC SERVICE COMPANY OF COLORADO


                      Secured Medium-Term Note, Series C
                     (being a First Collateral Trust Bond)


Original Issue Date:            Regular Record Dates:
Interest Rate:                  Initial Redemption Date:
Default Rate:                   Initial Redemption Percentage:
Stated Maturity:                Annual Redemption Percentage
Interest Payment Dates:         Reduction:
Addendum Attached               Optional Repayment Dates:
[  ] Yes
[  ] No                         Other/Additional Provisions:







                      This Note is not a Discount Security
              within the meaning of the within-mentioned Indenture.

                   -----------------------------------------


Principal Amount                                      Registered No.
$                                                     CUSIP


      PUBLIC  SERVICE  COMPANY OF COLORADO,  a  corporation  duly  organized and
existing  under the laws of the State of Colorado  (herein called the "Company,"
which term includes any successor  corporation  under the Indenture  referred to
below), for value received, hereby promises to pay to
                                   , or registered assigns, the principal sum of

Dollars  on the  Stated  Maturity  specified  above (or any  Redemption  Date or
Repayment Date as defined below),  and to pay interest thereon from the Original
Issue Date  specified  above or from the most recent  Interest  Payment  Date to
which interest has been paid or duly provided for,  semi-annually  in arrears on
the Interest  Payment Dates  specified  above in each year,  commencing with the
Interest  Payment Date next succeeding the Original Issue Date specified  above,
and at Maturity, at the Interest Rate per annum specified above, computed on the

                                      A-1
<PAGE>

basis of a 360-day year consisting of twelve 30-day months,  until the principal
hereof is paid or duly  provided  for and,  to the extent  that  payment of such
interest shall be legally  enforceable,  at the Default Rate per annum specified
above on any overdue payment of principal, premium, if any, and/or interest. The
interest so payable, and paid or duly provided for, on any Interest Payment Date
shall, as provided in such  Indenture,  be paid to the Person in whose name this
Note (or one or more  Predecessor  Securities)  is  registered  at the  close of
business on the Regular Record Date  specified  above (whether or not a Business
Day) next preceding such Interest Payment Date except that if the Original Issue
Date of this Note is after a Regular Record Date specified  above and before the
corresponding  Interest Payment Date, the first payment of interest on this Note
shall be made to the Person in whose name this Note (or one or more  Predecessor
Securities)  is registered  at the close of business on the Regular  Record Date
with respect to the next succeeding  Interest Payment Date.  Notwithstanding the
foregoing,  interest  payable  at  Maturity  shall be paid to the Person to whom
principal shall be paid.  Except as otherwise  provided in said  Indenture,  any
such  interest  not so paid or duly  provided  for shall  forthwith  cease to be
payable to the Holder on such Regular  Record Date and may either be paid to the
Person  in whose  name  this  Note (or one or more  Predecessor  Securities)  is
registered at the close of business on a Special  Record Date for the payment of
such  Defaulted  Interest to be fixed by the  Trustee,  notice of which shall be
given to Holders  of  Securities  of this  series not less than 15 days prior to
such  Special  Record  Date,  or paid in such other  manner as  permitted by the
Indenture.

      Notwithstanding  the  foregoing,  if an  Addendum  is  attached  hereto or
"Other/Additional  Provisions"  apply  to this  Note as  specified  on the  face
hereof,  this Note shall be subject to the terms set forth in such  Addendum  or
such "Other/Additional Provisions".

      Payment of the principal of and premium, if any, on this Note and interest
hereon  at  Maturity  shall be made  upon  presentation  of this  Note (and with
respect to any applicable repayment of this Note, a duly completed election form
as contemplated below) at the Corporate Trust Office of First Trust of New York,
National Association, in New York, New York or at such other office or agency as
may be designated for such purpose by the Company from time to time.  Payment of
interest on this Note (other than  interest at Maturity)  shall be made by check
mailed to the  address of the Person  entitled  thereto  as such  address  shall
appear in the Note  Register,  except that if such Person  shall be a securities
depositary,  such  payment  may be made by such other  means in lieu of check as
shall be agreed upon by the Company, the Trustee and such Person. Payment of the
principal of and premium, if any, and interest on this Note, as aforesaid, shall
be made in such coin or currency of the United  States of America as at the time
of payment shall be legal tender for the payment of public and private debts.

      This Note is one of a duly  authorized  issue of securities of the Company
(herein called the "Notes"), issued and issuable in one or more series under and
equally secured by an Indenture,  dated as of October 1, 1993 (such Indenture as
originally  executed and delivered and as  supplemented  or amended from time to
time  thereafter,  together with any constituent  instruments  establishing  the
terms of particular  Securities,  being herein called the "Indenture"),  between
the Company  and First Trust of New York,  National  Association,  as  successor
trustee (herein called the "Trustee," which term includes any further  successor
trustee under the Indenture), to which Indenture and all indentures supplemental
thereto  reference is hereby made for a description  of the property  mortgaged,
pledged  and held in  trust,  the  nature  and  extent of the  security  and the
respective rights,  limitations of rights, duties and immunities of the Company,
the Trustee and the Holders of the  Securities  thereunder  and of the terms and
conditions  upon which the  Securities  are,  and are to be,  authenticated  and
delivered and secured. The acceptance of this Note shall be deemed to constitute
the  consent  and  agreement  by the  Holder  hereof  to all  of the  terms  and
provisions of the Indenture. This Note is one of the series designated above.

      If any Interest  Payment Date, any Redemption  Date or the Stated Maturity
shall not be a Business Day (as hereinafter defined), payment of the amounts due
on this Note on such date may be made on the next succeeding  Business Day; and,

                                      A-2

<PAGE>

if such payment is made or duly  provided for on such  Business Day, no interest
shall accrue on such amounts for the period from and after such Interest Payment
Date,  Redemption Date or Stated Maturity,  as the case may be, to such Business
Day.

      Unless otherwise specified in an Addendum attached hereto, this Note shall
not be subject to any sinking fund or other  mandatory  redemption  and,  unless
otherwise  specified on the face hereof in accordance with the provisions of the
following four  paragraphs,  this Note is not subject to optional  redemption or
repayment prior to the Stated Maturity hereof.

      This Note is subject  to  redemption  at the option of the  Company at any
time on or after the Initial  Redemption  Date,  if any,  specified  on the face
hereof,  as a whole at any time or from time to time in part,  in  increments of
$1,000  (provided that any remaining  principal  amount hereof shall be at least
$100,000),  at the  Redemption  Price (as defined  below),  plus unpaid  accrued
interest  hereon to the date fixed for redemption  (each, a "Redemption  Date").
The  "Redemption  Price" shall  initially be the Initial  Redemption  Percentage
specified on the face hereof  multiplied by the unpaid  principal amount of this
Note to be redeemed.  The Initial  Redemption  Percentage  shall decline at each
anniversary of the Initial Redemption Date by the Annual Redemption  Percentage,
if any,  specified on the face hereof until the Redemption  Price is 100% of the
unpaid principal amount to be redeemed.

      Notice of  redemption  shall be given by mail to the  Holder of this Note,
not less  than 30 days  nor  more  than 60 days  prior  to the  date  fixed  for
redemption,  all as provided  in the  Indenture.  As provided in the  Indenture,
notice of  redemption at the election of the Company as aforesaid may state that
such  redemption  shall be  conditional  upon the receipt by the Paying Agent or
Agents for this  Note,  on or prior to the date  fixed for such  redemption,  of
money sufficient to pay the principal of and premium,  if any, and interest,  on
this Note; a notice of redemption so conditioned  shall be of no force or effect
if such money is not so received  and, in such event,  the Company  shall not be
required to redeem this Note.

      In the event of  redemption of this Note in part only, a new Note or Notes
of this series,  of like tenor, for the unredeemed  portion hereof and otherwise
having  the same  terms as this Note  will be  issued in the name of the  Holder
hereof upon the cancellation hereof.

      This Note will be subject to repayment by the Company at the option of the
Holder hereof on the Optional Repayment  Date(s),  if any, specified on the face
hereof, in whole or in part in increments of $1,000 (provided that any remaining
principal amount hereof shall be at least $100,000),  at a repayment price equal
to 100% of the  unpaid  principal  amount to be  repaid,  plus  unpaid  interest
accrued hereon to the date fixed for repayment  (each a "Repayment  Date").  For
this Note to be  repaid,  this Note must be  received  not more than 60 nor less
than 30 calendar days prior to the Repayment Date, together with the form hereon
entitled  "Option to Elect  Repayment"  duly  completed,  by the  Trustee at its
Corporate  Trust Office in New York,  New York or such other office or agency as
may be designated by the Company from time to time.  Exercise of such  repayment
option by the Holder  hereof will be  irrevocable.  In the event of repayment of
this  Note in part  only,  a new Note or Notes of like  tenor  for the  unrepaid
portion  hereof and otherwise  having the same terms as this Note will be issued
in the name of the Holder hereof upon the cancellation hereof.

      If an Event of Default  shall occur and be  continuing,  the  principal of
this Note may be  declared  due and  payable  in the  manner and with the effect
provided in the Indenture.

      The Indenture permits,  with certain  exceptions as therein provided,  the
Trustee to enter into one or more  supplemental  indentures  for the  purpose of
adding any provisions  to, or changing in any manner or  eliminating  any of the
provisions  of, the Indenture with the consent of the Holders of not less than a
majority in  aggregate  principal  amount of the  Securities  of all series then
Outstanding  under the Indenture,  considered as one class;  provided,  however,

                                      A-3

<PAGE>

that if there shall be Securities of more than one series  Outstanding under the
Indenture and if a proposed  supplemental  indenture  shall directly  affect the
rights of the Holders of Securities  of one or more,  but less than all, of such
series,  then  the  consent  only of the  Holders  of a  majority  in  aggregate
principal  amount  of the  Outstanding  Securities  of all  series  so  directly
affected,  considered as one class,  shall be required;  and provided,  further,
that if the  Securities  of any series  shall have been  issued in more than one
Tranche and if the proposed  supplemental  indenture  shall directly  affect the
rights of the Holders of Securities  of one or more,  but less than all, of such
Tranches,  then the  consent  only of the  Holders  of a majority  in  aggregate
principal  amount of the  Outstanding  Securities  of all  Tranches  so directly
affected,  considered as one class,  shall be required;  and provided,  further,
that the  Indenture  permits the Trustee to enter into one or more  supplemental
indentures  for  limited   purposes  without  the  consent  of  any  Holders  of
Securities.  The Indenture also contains provisions  permitting the Holders of a
majority in principal  amount of the Securities then  Outstanding,  on behalf of
the Holders of all Securities,  to waive  compliance by the Company with certain
provisions of the  Indenture  and certain past defaults  under the Indenture and
their consequences.  Any such consent or waiver by the Holder of this Note shall
be conclusive  and binding upon such Holder and upon all future  Holders of this
Note and of any Note  issued  upon the  registration  of  transfer  hereof or in
exchange  herefor or in lieu hereof,  whether or not notation of such consent or
waiver is made upon this Note.

      As provided in the  Indenture and subject to certain  limitations  therein
set forth,  this Note or any  portion of the  principal  amount  hereof  will be
deemed to have been paid for all purposes of the  Indenture  and to be no longer
Outstanding  thereunder,  and, at the  election of the  Company,  the  Company's
entire  indebtedness  in respect  thereof will be satisfied and  discharged,  if
there has been irrevocably deposited with the Trustee or any Paying Agent (other
than the Company),  in trust, money in an amount which will be sufficient and/or
Eligible  Obligations,  the principal of and interest on which when due, without
regard to any  reinvestment  thereof,  will provide moneys which,  together with
moneys so deposited,  will be  sufficient,  to pay when due the principal of and
premium, if any, and interest on this Note when due.

      As provided in the  Indenture and subject to certain  limitations  therein
set forth,  the transfer of this Note is registrable  in the Security  Register,
upon surrender of this Note for  registration of transfer at the Corporate Trust
Office of First Trust of New York, National  Association,  in New York, New York
or such other office or agency as may be  designated by the Company from time to
time,  duly endorsed by, or accompanied  by a written  instrument of transfer in
form  satisfactory  to the Company and the Security  Registrar duly executed by,
the Holder hereof or his attorney duly authorized in writing,  and thereupon one
or more new  Securities of this series of authorized  denominations  and of like
tenor  and  aggregate  principal  amount,  will  be  issued  to  the  designated
transferee or transferees.

      The Notes are issuable only as registered Notes,  without coupons,  and in
denominations  of $100,000  and in any greater  amount in integral  multiples of
$1,000. As provided in the Indenture and subject to certain  limitations therein
set forth, the Notes are  exchangeable for a like aggregate  principal amount of
Notes of the same  series  and  Tranche,  of any  authorized  denominations,  as
requested by the Holder  surrendering the same, and of like tenor upon surrender
of the Note or Notes to be  exchanged  at the  Corporate  Trust  Office of First
Trust of New York,  National  Association,  in New York,  New York or such other
office or agency as may be designated by the Company from time to time.

      The  Company  shall  not  be  required  to  execute  or  provide  for  the
registration  of transfer of or the  exchange of this Note during a period of 15
days  immediately  preceding  the date notice is given  calling this Note or any
part hereof for redemption, except with respect to the unredeemed portion of any
Note being redeemed in part.

      No service charge shall be made for any such  registration  of transfer or
exchange,  but the Company may require  payment of a sum sufficient to cover any
tax or other governmental charge payable in connection therewith.

                                      A-4

<PAGE>

      Prior to due presentment of this Note for  registration  of transfer,  the
Company,  the  Trustee and any agent of the Company or the Trustee may treat the
Person in whose name this Note is  registered  as the absolute  owner hereof for
all purposes,  whether or not this Note be overdue, and neither the Company, the
Trustee nor any such agent shall be affected by notice to the contrary.

      The  Indenture  and  this  Note  shall be  governed  by and  construed  in
accordance with the laws of the State of New York.

      As used  herein  "Business  Day" means any day,  other than a Saturday  or
Sunday,  which is not a day on which banking  institutions or trust companies in
The City of New York,  New York or other city in which is located  any office or
agency  maintained  for the payment of the principal of, or premium,  if any, or
interest on this Note, are generally  authorized or required by law,  regulation
or executive order to remain closed. All other terms used in this Note which are
defined  in the  Indenture  shall  have  the  meanings  assigned  to them in the
Indenture.

      As provided in the Indenture,  no recourse shall be had for the payment of
the principal of, premium,  if any, or interest on any  Securities,  or any part
thereof,  or for any claim based thereon or otherwise in respect thereof,  or of
the  indebtedness  represented  thereby,  or upon any  obligation,  covenant  or
agreement under the Indenture,  against,  and no personal  liability  whatsoever
shall attach to, or be incurred by, any  incorporator,  shareholder,  officer or
director,  as such, past, present or future of the Company or of any predecessor
or  successor   corporation  (either  directly  or  through  the  Company  or  a
predecessor or successor  corporation),  whether by virtue of any constitutional
provision,  statute or rule of law, or by the  enforcement  of any assessment or
penalty  or  otherwise;  it  being  expressly  agreed  and  understood  that the
Indenture and all the Securities are solely  corporate  obligations and that any
such personal  liability is hereby  expressly waived and released as a condition
of, and as part of the consideration for, the execution of the Indenture and the
issuance of the Securities.

      Unless the certificate of  authentication  hereon has been executed by the
Trustee or an Authenticating  Agent by manual signature,  this Note shall not be
entitled to any benefit under the  Indenture or be valid or  obligatory  for any
purpose.


                                      A-5
<PAGE>


      IN WITNESS  WHEREOF,  the Company has caused  this  instrument  to be duly
executed under its corporate seal to be hereunto affixed and attested.

                                    PUBLIC SERVICE COMPANY OF COLORADO



                                    By:___________________________________
                                          Senior Vice President


Attest:

_____________________
      Secretary


                         CERTIFICATE OF AUTHENTICATION

      This is one of the Securities of the series designated therein referred to
in the within-mentioned Indenture.

Dated:________________

FIRST TRUST OF NEW YORK,            OR          FIRST TRUST OF NEW YORK,
NATIONAL ASSOCIATION                      NATIONAL ASSOCIATION,
  as Trustee                                       as Trustee



By:                                     By:   [                     ],
         Authorized Officer                   as Authenticating Agent



                                        By:
                                                Authorized Officer

      Unless this  certificate is presented by an authorized  representative  of
The Depository Trust Company, a New York corporation  ("DTC"), to the Company or
its  agent  for  registration  of  transfer,   exchange,  or  payment,  and  any
certificate issued is registered in the name of Cede & Co. or in such other name
as is requested by an authorized  representative of DTC (and any payment is made
to  Cede  & Co.  or to  such  other  entity  as is  requested  by an  authorized
representative  of DTC), ANY TRANSFER,  PLEDGE, OR OTHER USE HEREOF FOR VALUE OR
OTHERWISE  BY OR TO ANY PERSON IS  WRONGFUL  inasmuch  as the  registered  owner
hereof, Cede & Co., has an interest herein.

      This  Note may not be  transferred  or  exchanged,  nor may any  purported
transfer be registered,  except (i) this Note may be  transferred in whole,  and
appropriate  registration  of transfer  effected,  if such transfer is by Cede &
Co., as nominee for The  Depository  Trust  Company (the  "Depositary"),  to the
Depositary,  or by the Depositary to another nominee thereof,  or by any nominee
of the  Depositary to any other  nominee  thereof,  or by the  Depositary or any
nominee thereof to any successor  securities  depositary or any nominee thereof;
and (ii) this Note may be  exchanged  for  definitive  Notes  registered  in the
respective  names of the beneficial  holders  hereof,  and  thereafter  shall be
transferable  without  restrictions  if: (A) the  Depositary,  or any  successor
securities  depositary,  shall have notified the Company and the Trustee that it
is unwilling or unable to continue to act as securities  depositary with respect
to this Note or the Company becomes aware that the Depositary has ceased to be a
clearing  agency  registered  under  the  Securities  Exchange  Act of 1934,  as
amended,  and in any such case the Trustee  shall not have been  notified by the
Company  within  ninety  (90) days of the  identity  of a  successor  securities

                                      A-6

<PAGE>

depositary  with respect to this Note;  (B) the Company shall have  delivered to
the Trustee an  Officer's  Certificate  to the effect that this Note shall be so
exchangeable  on and  after a date  specified  therein;  or  (C)(1)  an Event of
Default shall have occurred and be continuing,  (2) the Trustee shall have given
notice of such Event of Default  pursuant to Section 1102 of the  Indenture  and
(3) there shall have been delivered to the Company and the Trustee an Opinion of
Counsel to the effect that the interests of the  beneficial  owners of this Note
in respect thereof will be materially impaired unless such owners become Holders
of definitive Notes.

                             --------------------

      FOR VALUE RECEIVED the undersigned  hereby sells,  assigns and transfers
unto



    [please insert social security or other identifying number of assignee]



           [please print or typewrite name and address of assignee]



the  within  Note of  PUBLIC  SERVICE  COMPANY  OF  COLORADO  and does  hereby
irrevocably constitute and appoint______________________________, Attorney, to
transfer said Note on the books of the within-mentioned  Company, with full
power of substitution in the premises.



Dated:




      Notice:  The signature to this  assignment must correspond with the name
as written upon the face of the Note in every particular without alteration or
enlargement or any change whatsoever.

                                      A-7
<PAGE>


                           OPTION TO ELECT REPAYMENT

      The undersigned hereby irrevocably  request(s) and instruct(s) the Company
to repay this Note (or portion hereof  specified below) pursuant to its terms at
a price equal to 100% of the principal amount to be repaid, together with unpaid
interest accrued hereon to the Repayment Date, to the undersigned, at __________
        (Please print or typewrite name and address of the undersigned)

      For this Note to be repaid,  the  Trustee  must  receive at its  Corporate
Trust  Office in New York,  New York not more than 60 nor less than 30  calendar
days  prior  to the  Repayment  Date,  this  Note  with  this  "Option  to Elect
Repayment" form duly completed.

      If less than the  entire  principal  amount of this Note is to be  repaid,
specify the portion  hereof (which shall be increments of $1,000  (provided that
any remaining  principal  amount hereof shall be at least  $100,000))  which the
Holder  elects to have  repaid and  specify the  denomination  or  denominations
(which  shall be a minimum of  $100,000) of the Notes to be issued to the Holder
for the  portion  of this  Note not being  repaid  (in the  absence  of any such
specification, one such Note will be issued for the portion not being repaid).


Principal Amount
to be Repaid:  $______________                 ____________________________

Date:                                          Notice:   The   signature(s)
      -------------------------
                                               on  this   Option  to  Elect
                                               Repayment  must   correspond
                                               with the  name(s) as written
                                               upon the  face of this  Note
                                               in     every     particular,
                                               without     alteration    or
                                               enlargement  or  any  change
                                               whatsoever.


                                      A-8
<PAGE>


                                                                    SCHEDULE A

                            SUPPLEMENTAL INDENTURES


     Date of                                                     Principal
  Supplemental                                   Principal        Amount
    Indenture           Series of Bonds        Amount Issued    Outstanding
    ---------           ---------------        -------------    -----------

November 1, 1993         Series No. 1          $134,500,000    $134,500,000

January 1, 1994    Series No. 2 due 2001 and   $102,667,000    $102,667,000
                     Series No. 2 due 2024     $110,000,000    $110,000,000

September 2, 1994       Appointment of             None            None
                       Successor Trustee

May 1, 1996          Series No. 3 due 2006     $125,000,000    $125,000,000

November 1, 1996     Series No. 4 due from     $150,000,000*   $150,000,000
                     9 months to 30 years
                      from date of issue


* $250,000,000 authorized


                                      I-1
<PAGE>



                                                                     SCHEDULE B

                              PROPERTY DESCRIPTION

The following  properties are situated in the State of Colorado and the counties
thereof:

                                 ARAPAHOE COUNTY

1.     QUINCY SUBSTATION

A parcel of land  located in the SW 1/4  Section 5,  Township 5 South,  Range 64
West of the 6th Principal Meridian, Arapahoe County, Colorado, more particularly
described as follows:

Commencing  at the SE corner of said SW 1/4  Section 5;  Whence the SW corner of
said Section 5 bears N 89 Degrees 42'59" W a distance of 2,635.92 feet; Thence N
89 Degrees  42'59" W along the South line of said SW 1/4 Section 5 a distance of
350.00 feet to a point; Thence N 00 Degrees 17'01" E a distance of 55.00 feet to
a point on the North line of County Road 30 (Quincy Avenue) as described in Book
2826, Page 722, Reception No. 1761586,  Arapahoe County Clerk and Recorder, also
being the true point of  beginning;  Thence  along the North Line of said County
Road 30 (Quincy  Avenue),  N 89 Degrees  42'59" W a distance of 190.00 feet to a
point;  Thence N 00 Degrees 17'01"E a distance of 455.00 feet to a point; Thence
S 89 Degrees 42'59" E a distance of 190.00 feet to a point;  Thence S 00 Degrees
17'01" W a  distance  of  455.00  feet to the  point  of  beginning,  County  of
Arapahoe, State of Colorado


<PAGE>

<TABLE> <S> <C>


<ARTICLE>                                           UT
<LEGEND>
     THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED
     FROM PUBLIC SERVICE COMPANY OF COLORADO AND SUBSIDIARIES CONSOLIDATED
     BALANCE SHEET AS OF MARCH 31, 1997 AND CONSOLIDATED STATEMENTS OF INCOME
     AND CASH FLOWS FOR THE THREE MONTHS ENDED MARCH 31, 1997 AND IS QUALIFIED
     IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER>                                   1,000
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                              DEC-31-1996
<PERIOD-END>                                   MAR-31-1997
<BOOK-VALUE>                                   PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                      3,616,379
<OTHER-PROPERTY-AND-INVEST>                       43,058
<TOTAL-CURRENT-ASSETS>                           881,719
<TOTAL-DEFERRED-CHARGES>                         371,824
<OTHER-ASSETS>                                         0
<TOTAL-ASSETS>                                 4,912,980
<COMMON>                                         326,350
<CAPITAL-SURPLUS-PAID-IN>                        739,522
<RETAINED-EARNINGS>                              415,513
<TOTAL-COMMON-STOCKHOLDERS-EQ>                 1,481,385
                             39,913
                                      140,008
<LONG-TERM-DEBT-NET>                           1,482,816
<SHORT-TERM-NOTES>                               132,250
<LONG-TERM-NOTES-PAYABLE>                              0
<COMMERCIAL-PAPER-OBLIGATIONS>                   163,150
<LONG-TERM-DEBT-CURRENT-PORT>                    255,076
                          2,576
<CAPITAL-LEASE-OBLIGATIONS>                       43,270
<LEASES-CURRENT>                                       0
<OTHER-ITEMS-CAPITAL-AND-LIAB>                 1,215,806
<TOT-CAPITALIZATION-AND-LIAB>                  4,912,980
<GROSS-OPERATING-REVENUE>                        677,660
<INCOME-TAX-EXPENSE>                              35,317
<OTHER-OPERATING-EXPENSES>                        82,828
<TOTAL-OPERATING-EXPENSES>                       572,842
<OPERATING-INCOME-LOSS>                          104,818
<OTHER-INCOME-NET>                                  (889)
<INCOME-BEFORE-INTEREST-EXPEN>                   103,929
<TOTAL-INTEREST-EXPENSE>                          41,048
<NET-INCOME>                                      62,881
                        2,943
<EARNINGS-AVAILABLE-FOR-COMM>                     59,938
<COMMON-STOCK-DIVIDENDS>                          34,267
<TOTAL-INTEREST-ON-BONDS>                              0
<CASH-FLOW-OPERATIONS>                            68,188
<EPS-PRIMARY>                                      0.920
<EPS-DILUTED>                                      0.920
        


</TABLE>


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