KEYSPAN CORP
424B5, 2000-11-16
NATURAL GAS DISTRIBUTION
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                                     Prospectus filed pursuant to Rule 424(b)(5)
                                                      Registration No. 333-43768

Prospectus Supplement
To Prospectus dated October 26, 2000


$1,650,000,000

[GRAPHIC_OMITTED]


KeySpan Corporation

$700,000,000  7.25%  NOTES DUE 2005
$700,000,000  7.625% NOTES DUE 2010
$250,000,000  8.00%  NOTES DUE 2030

The Company will pay interest on the Notes on a semi-annual  basis on May 15 and
November 15 of each year,  beginning  May 15,  2001.  Interest  will accrue from
November 20,  2000.  The Company may redeem the Notes in whole or in part at any
time at the redemption  prices  described on page S-26. The Notes will be issued
in minimum denominations of $1,000 increased in multiples of $1,000.

Neither the  Securities  and Exchange  Commission  nor any state  commission has
approved or  disapproved  of these  securities  or passed  upon the  adequacy or
accuracy of this prospectus.  Any  representation  to the contrary is a criminal
offense.
--------------------------------------------------------------------------------
                        Price to             Discounts and          Proceeds to
                        Public               Commissions            the Company
--------------------------------------------------------------------------------
Per 2005 Note              99.784%              0.600%                  99.184%
--------------------------------------------------------------------------------
Total                 $698,488,000          $4,200,000             $694,288,000
--------------------------------------------------------------------------------
Per 2010 Note              99.926%              0.650%                  99.276%
--------------------------------------------------------------------------------
Total                 $699,482,000          $4,550,000             $694,932,000
--------------------------------------------------------------------------------
Per 2030 Note              99.844%              0.875%                  98.969%
--------------------------------------------------------------------------------
Total                 $249,610,000          $2,187,500             $247,422,500
--------------------------------------------------------------------------------
The Notes will not be listed on any  national  securities  exchange.  Currently,
there is no public market for the Notes.

It is expected that delivery of the Notes will be made on or about  November 20,
2000.

J.P. MORGAN & CO.
                           CHASE SECURITIES INC.
                                                       SALOMON SMITH BARNEY

ABN AMRO INC.                                              FLEET SECURITIES INC.
BANK OF AMERICA SECURITIES LLC                         PNC CAPITAL MARKETS, INC.
BANC ONE CAPITAL MARKETS, INC.                           RBC DOMINION SECURITIES
BNY CAPITAL MARKETS, INC.                       THE ROYAL BANK OF SCOTLAND GROUP
BARCLAYS CAPITAL INC.                                             SCOTIA CAPITAL
CREDIT LYONNAISE SECURITIES INC.                 UTENDAHL CAPITAL PARTNERS, L.P.
                                                THE WILLIAMS CAPITAL GROUP, L.P.
November 15, 2000


<PAGE>



           No  person  is  authorized  to give  any  information  or to make any
representations  other than those contained or incorporated by reference in this
prospectus  supplement or the  accompanying  prospectus,  and, if given or made,
such  information  or  representations  must not be relied  upon as having  been
authorized.  This prospectus  supplement and the accompanying  prospectus do not
constitute  an  offer  to  sell  or the  solicitation  of an  offer  to buy  any
securities other than the securities described in this prospectus  supplement or
an offer to sell or the  solicitation  of an offer to buy such securities in any
circumstances  in which such offer or  solicitation  is  unlawful.  Neither  the
delivery of this prospectus supplement or the accompanying  prospectus,  nor any
sale made hereunder and thereunder shall,  under any  circumstances,  create any
implication  that there has been no change in the  affairs of KeySpan  since the
date hereof or that the  information  contained  or  incorporated  by  reference
herein or  therein  is  correct  as of any time  subsequent  to the date of such
information.



                                                           TABLE OF CONTENTS
<TABLE>
<CAPTION>

                                                         PROSPECTUS SUPPLEMENT

                                                                                                                                PAGE
                                                                                                                                ----
<S>                                                                                                                            <C>
KeySpan Corporation..............................................................................................................S-1
Use of Proceeds..................................................................................................................S-2
Capitalization...................................................................................................................S-2
Selected Financial Information...................................................................................................S-3
Pro Forma Financial Information..................................................................................................S-5
Management's Discussion and Analysis of Financial Condition and Results of Operations...........................................S-13
Description of Notes............................................................................................................S-25
Underwriting....................................................................................................................S-29
Index to Financial Statements...................................................................................................FS-1

                                                              PROSPECTUS

                                                                                                                                PAGE
                                                                                                                                ----
About this Prospectus..............................................................................................................1
Risk Factors.......................................................................................................................1
Where You Can Find More Information................................................................................................1
Forward-Looking Statements.........................................................................................................2
KeySpan Corporation................................................................................................................3
Use of Proceeds....................................................................................................................3
Ratio of Earnings to Fixed Charges.................................................................................................4
Description of Securities..........................................................................................................5
Certain U.S. Federal Income Tax Consequences......................................................................................16
Plan of Distribution..............................................................................................................18
Legal Opinions....................................................................................................................19
Experts...........................................................................................................................19
</TABLE>




<PAGE>



                               KEYSPAN CORPORATION

           KeySpan Corporation, a New York corporation,  was formed in May 1998,
as a result of the  business  combination  of KeySpan  Energy  Corporation,  the
parent of The Brooklyn Union Gas Company,  and certain businesses of Long Island
Lighting  Company.  On November  8, 2000,  we acquired  Eastern  Enterprises,  a
Massachusetts  business trust, and the parent of several gas utilities operating
in Massachusetts.  Also on November 8, 2000, Eastern acquired EnergyNorth, Inc.,
the parent of a gas utility operating in central New Hampshire.

           Our core business is gas distribution, conducted by our six regulated
gas utility  subsidiaries:  The Brooklyn  Union Gas Company d/b/a KeySpan Energy
Delivery New York and KeySpan Gas East Corporation d/b/a KeySpan Energy Delivery
Long Island distribute gas to customers in the Boroughs of Brooklyn,  Queens and
Staten  Island in New York City and the  Counties  of Nassau and Suffolk on Long
Island,  respectively;  Boston Gas  Company,  Colonial Gas Company and Essex Gas
Company, each doing business as KeySpan Energy Delivery New England,  distribute
gas to customers in eastern and central  Massachusetts;  and EnergyNorth Natural
Gas, Inc. d/b/a KeySpan Energy Delivery New England distributes gas to customers
in  central  New  Hampshire.   Together,   these  companies  distribute  gas  to
approximately 2.4 million customers throughout the Northeast.

           We are also a major,  and growing,  generator of electricity.  We own
and operate five large generating plants and 42 smaller facilities in Nassau and
Suffolk Counties on Long Island and lease and operate a major facility in Queens
County in New York City.  Under  contractual  arrangements,  we  provide  power,
electric  transmission  and  distribution  services,  billing and other customer
services for  approximately  one million  electric  customers of the Long Island
Power Authority on Long Island.

           Our other  subsidiaries  are involved in oil and gas  exploration and
production;  gas  storage;  wholesale  and  retail gas and  electric  marketing;
appliance service;  heating,  ventilation and air conditioning  installation and
services;   large   energy-system   ownership,   installation   and  management;
telecommunications;   energy-related  internet  activities;  fuel  cells;  water
barging   activities,   including   the   hauling  of  fuel  and  other   cargo;
transportation  by truck of liquid natural gas and propane;  and providing meter
reading  equipment and services to municipal  utilities.  We also invest in, and
participate in the development of, pipelines and other energy-related  projects,
domestically and internationally.

                               KEYSPAN CORPORATION
                                        |
                                        |
                                        |
----------------------------------------------|------------------------------
       |                 |              |              |              |
Gas Distribution-----Electric-----Gas Exploration-----Energy-------Energy
       |             Services     & Production        Services    Investments
       |                 |              |                |            |
       |                 |              |                |            |
-------|-----------------|--------------|----------------|------------|-------
KeySpan Energy        KeySpan         Houston         KeySpan        KeySpan
Delivery New          Generation      Exploration     Services       Canada
York and Long         KeySpan         KeySpan         Inc.           Midland
Island                Electric        Exploration     Home           Enterprises
Boston Gas            Services        & Production    Energy         Iroquois
Colonial Gas          KeySpan                         Services       Pipeline
Essex Gas             Ravenswood                      Business       Premier
EnergyNorth Gas       KeySpan                         Solutions     Transmission
                      Energy                          KeySpan        Phoenix
                      Trading                         Energy         Natural Gas
                                                      Supply
                                                      KeySpan
                                                      Communications
                                                      ServicEdge
                                                      MyHomeKey.com



           We are a registered  holding company under the Public Utility Holding
Company  Act of  1935,  as  amended.  Therefore,  our  corporate  and  financial
activities  and  those  of our  subsidiaries  (including  their  ability  to pay
dividends  to us) are  subject to  regulation  by the  Securities  and  Exchange
Commission.  Under  our  holding  company  structure,  we  have  no  independent
operations or source of income of our own and conduct  substantially  all of our
operations  through our subsidiaries and, as a result, we depend on the earnings
and cash flow of, and  dividends or  distributions  from,  our  subsidiaries  to
provide  the  funds  necessary  to meet our debt  and  contractual  obligations.
Furthermore, a substantial portion of our consolidated assets, earnings and cash
flow is derived from the operations

                                       S-1

<PAGE>



of our regulated utility subsidiaries, whose legal authority to pay dividends or
make other  distributions  to us is subject to  regulation  by state  regulatory
authorities.



                                 USE OF PROCEEDS

           The  net  proceeds   from  the   offering   will  be  used  to  repay
approximately  $1.65 billion of commercial  paper backed by a $1.65 billion bank
credit facility  issued to finance a portion of the  acquisitions of Eastern and
EnergyNorth (the "Bridge  Financing").  The Bridge Financing bears interest at a
rate of approximately 6.78% and has a maturity of up to 364 days.



                                 CAPITALIZATION

           The following table sets forth as of September 30, 2000:

          o    our actual capitalization;

          o    our pro forma capitalization  showing the Eastern and EnergyNorth
               acquisitions; and

          o    our pro forma  capitalization  as adjusted to reflect the receipt
               of the net  proceeds of the  offering of the Notes and use of the
               proceeds thereof to repay the Bridge Financing.

<TABLE>
<CAPTION>
                                                                                          PROFORMA FOR
                                                                                          THE EASTERN/              PROFORMA
                                                                                          ENERGYNORTH             ADJUSTED FOR
                                                                             ACTUAL       ACQUISITION               OFFERING
                                                                ------------------- ------------------------------------------------
                                                                                           (in thousands)
<S>                                                                      <C>                      <C>                  <C>
Short-term debt                                                 $           382,090      $         2,691,959 (1) $      1,041,959(2)
                                                                ===================      ===================     ===================

Long-term debt                                                  $         2,120,752      $         2,667,900     $      4,317,900(2)
Current maturities of long-term debt                                              -                    6,849                   6,849
                                                                -------------------      -------------------     -------------------
   Total long-term debt                                                   2,120,752                2,674,749               4,324,749
                                                                -------------------      -------------------     -------------------

Preferred stock                                                              84,323                  101,060                 101,060
                                                                -------------------      -------------------     -------------------

Common stock, $.01 par value, authorized
   450,000,000 shares; outstanding 134,575,028                            2,987,242                2,991,914(3)            2,991,914

Retained earnings                                                           481,658                  481,658                 481,658
Accumulated comprehensive income                                             (6,476)                  (6,476)                (6,476)
Treasury stock purchased                                                   (702,435)                (702,435)              (702,435)
                                                                -------------------      -------------------     -------------------

   Total common shareholders' equity                                      2,759,989                2,764,661               2,764,661
                                                                -------------------      -------------------     -------------------

   Total capitalization                                         $         4,965,064      $         5,540,470     $         7,190,470
                                                                ===================      ===================     ===================
</TABLE>
------------------------------
(1)Short-term debt includes  commercial paper borrowings  outstanding at
   September 30, 2000, the Bridge Financing, gas inventory financing and
   commercial  paper  issued to finance  transaction  and  restructuring
   costs incurred in connection with the acquisitions.
(2)Adjusted for the issuance of the Notes and repayment of the Bridge Financing.
(3)Adjusted for the conversion of Eastern options to KeySpan options.


                                       S-2

<PAGE>



                         SELECTED FINANCIAL INFORMATION

           We derived the selected  financial  information  presented below from
our audited historical  consolidated financial statements as of and for the year
ended December 31, 1999, our unaudited  consolidated  financial statements as of
and for the nine months  ended  September  30, 1999 and 2000,  and our pro forma
financial  information  which  combines the  historical  information of KeySpan,
Eastern and  EnergyNorth.  You should read the  selected  financial  information
together with our consolidated financial statements,  the consolidated financial
statements of Eastern,  our pro forma financial  information  and  "Management's
Discussion and Analysis of Financial  Condition and Results of Operations," each
of which is included in this document.

<TABLE>
<CAPTION>
                                                                                                                      PROFORMA
                                                                                                                     NINE MONTHS
                                                           YEAR ENDED                NINE MONTHS ENDED                  ENDED
                                                          DECEMBER 31,                 SEPTEMBER 30,                SEPTEMBER 30,
                                                              1999                                                      2000
                                                                            -----------------------------------
                                                                                  1999                2000
                                                       ------------------   -----------------    --------------   -----------------
                                                                                  (dollars in thousands)
<S>                                                            <C>                 <C>              <C>                 <C>
INCOME SUMMARY
REVENUES
Gas distribution                                       $        1,753,132   $       1,208,254    $    1,458,595   $       2,183,827
Electric services                                                 861,582             606,552         1,097,616           1,097,616
Gas exploration and production                                    150,581             103,622           169,966             169,966
Energy related services and other                                 189,318             124,675           485,161             504,874
Marine services                                                         -                   -                 -             211,751
                                                                ----------          ----------        ----------   ----------------
TOTAL REVENUES                                                  2,954,613           2,043,103         3,211,338           4,168,034
OPERATING EXPENSES
Purchased gas and fuel                                            761,684             498,609         1,051,275           1,393,854
Depreciation, depletion and amortization                          253,440             180,698           216,364             322,229
Other operating expenses                                        1,457,320           1,023,576         1,421,591           1,884,232
                                                                ---------           ---------         ---------   -----------------
OPERATING INCOME                                                  482,169             340,220           522,108             567,719
Other income                                                       37,496              32,202             9,096              14,564
Interest charges                                                  124,692              98,824           120,106             283,062
Income taxes                                                      136,362              98,372           170,858             144,603
                                                                ----------         ----------        ----------    -----------------
NET INCOME                                             $          258,611   $         175,226    $      240,240   $         154,618
                                                       ==================   =================    ==============   =================

FINANCIAL SUMMARY
EBITDA (1)                                             $          735,609   $         520,898    $      738,472   $         889,948
Total assets                                                    6,730,691           6,357,880         7,252,521          10,722,953
Common equity                                                   2,715,025           2,701,898         2,759,989           2,764,661
Long term debt (2)                                              1,682,702           1,664,040         2,120,752           4,324,749
Total capitalization (3)                                        4,845,066           4,813,297         4,965,064           7,190,470
Short term debt (4)                                               208,300             103,950           382,090           1,041,959
Capital expenditures                                              725,670             512,991           403,611             463,557

FINANCIAL STATISTICS
Ratio of earnings to fixed charges (5)                              3.23x               3.04x             3.41x                 N/A
EBITDA / interest expense (6)                                       5.90x               5.27x             6.15x               3.14x
Cash flow from operations / interest expense                        4.72x               4.48x             3.89x                 N/A
Long term debt / total capitalization                              34.73%              34.57%            42.71%              60.15%

UTILITY OPERATING STATISTICS
Firm gas and transportation sales (MDTH) (7)                      275,771             197,194           189,966             313,602
Other sales (MDTH)                                                 54,661              38,279            67,380              68,254
Total active gas meters                                         1,628,497           1,616,000         1,633,838           2,447,854
Gas heating customers                                             677,000             668,927           680,417           1,232,138
</TABLE>
------------------
(1)        Earnings  Before  Interest,   Taxes,  Depreciation  and  Amortization
           ("EBITDA") reflects operating income with depreciation, depletion and
           amortization  added back.  We present  EBITDA  because it is a widely
           accepted  financial  indicator used by certain investors and analysts
           to  analyze  and  compare   companies   on  the  basis  of  operating
           performance  and  because we  believe  that  EBITDA is an  additional
           meaningful measure of performance and liquidity.

                                       S-3

<PAGE>



           EBITDA does not  represent  cash flows for the  period,  nor is it an
           alternative  to operating  income (loss) as an indicator of operating
           performance.  You  should  not  consider  it  in  isolation  or  as a
           substitute  for measures of performance  prepared in accordance  with
           generally accepted accounting principles. The items excluded from the
           calculation of EBITDA are significant components in understanding and
           assessing our financial  performance.  Our  computation of EBITDA may
           not be comparable to the computation of similarly  titled measures of
           other  companies.  EBITDA  does not  represent  funds  available  for
           discretionary uses.

(2)        Long term debt includes current maturities of long term debt.

(3)        Total capitalization  reflects shareholders' equity,  preferred stock
           (including  currently  redeemable preferred stock) and long-term debt
           outstanding  (including current maturities).  Outstanding  commercial
           paper and gas inventory  financing  have not been  reflected in total
           capitalization.

(4)        Short-term  debt reflects  commercial  paper  borrowings  and gas
           inventory financing.

(5)        For the ratio of earnings to fixed charges  calculation,  earnings is
           the amount  resulting from adding (a) pre-tax income from  continuing
           operations  before  adjustment for minority  interest in consolidated
           subsidiaries  or  income  or loss from  equity  investees,  (b) fixed
           charges, (c) amortization of capitalized interest and (d) distributed
           income of equity investees. From this total, capitalized interest was
           subtracted.  The term "fixed charge" is the sum of the following: (a)
           interest  expensed  and  capitalized,   (b)  amortized  premiums  and
           discounts related to indebtedness and (c) an estimate of the interest
           expenses within rental expense.

(6)        Interest expense included in this  calculation  includes  interest on
           long-term debt,  short-term debt and amortized premiums and discounts
           related to  indebtedness.  Capitalized  interest  is not  included in
           interest expense.

(7)        A MDTH is 10,000  therms  (British  Thermal  Units) and  reflects the
           heating  content of  approximately  one million  cubic feet of gas. A
           therm reflects the heating content of approximately 100 cubic feet of
           gas.





                                       S-4

<PAGE>

                         PRO FORMA FINANCIAL INFORMATION

           The unaudited pro forma  consolidated  condensed  balance sheet as of
September  30, 2000 and the unaudited pro forma  consolidated  condensed  income
statements  for the nine  months  ended  September  30,  2000 and the year ended
December 31, 1999 combine the  historical  information  of KeySpan,  Eastern and
EnergyNorth. The unaudited pro forma consolidated condensed financial statements
have been prepared to reflect our acquisitions of Eastern and EnergyNorth  under
the purchase  method of  accounting.  Under the purchase  method of  accounting,
assets  acquired and  liabilities  assumed are recorded at their  estimated fair
values. The excess of the purchase price,  including estimated fees and expenses
directly  related  to the  acquisition,  in excess of the fair  value of the net
assets  acquired is  classified  as goodwill on the  accompanying  unaudited pro
forma consolidated condensed balance sheet. The estimated fair values and useful
lives of assets acquired and liabilities assumed and any resulting goodwill, are
subject to final  valuation  adjustments in accordance  with generally  accepted
accounting principles.

           The pro  forma  adjustments  reflected  in the  unaudited  pro  forma
consolidated  condensed balance sheet are as if the transactions had occurred on
September  30, 2000.  The  unaudited  pro forma  consolidated  condensed  income
statement  for the nine  months  ended  September  30, 2000  assumes  that these
transactions  were  completed  on  January  1,  2000.  The  unaudited  pro forma
consolidated  condensed  income  statement for the year ended  December 31, 1999
assumes that these transactions were completed on January 1, 1999. The unaudited
pro forma consolidated  condensed  financial  statements reflect our purchase of
all of the outstanding  common stock of Eastern for $64.56 per share in cash and
all of the outstanding  common stock of EnergyNorth for $61.46 per share in cash
on November 8, 2000.

           On August 31,  1999,  Eastern  completed a merger with  Colonial  Gas
Company which was accounted for using the purchase method of accounting; Eastern
was the acquiring company for financial  reporting  purposes.  The unaudited pro
forma  consolidated  condensed  income statement for the year ended December 31,
1999,  therefore,  reflects the results of  operations  of Colonial for the four
month period September 1, 1999 through December 31, 1999.

           The unaudited pro forma consolidated  condensed financial  statements
do not reflect  the  anticipated  cost  savings  that may be  obtained  from the
elimination  of duplicate  corporate and  administrative  programs in connection
with  the  acquisitions  or  operating  efficiencies  that may  result.  We have
identified before-tax synergy savings to be approximately $40 million annually.

           The following  unaudited pro forma consolidated  condensed  financial
statements  should  be read in  conjunction  with  the  historical  consolidated
financial  statements  and  related  notes  thereto  of  KeySpan,   Eastern  and
EnergyNorth.  The following  statements  are not  necessarily  indicative of the
financial  position  or  operating  results  that  would have  occurred  had the
proposed  transactions  been consummated on the date, or at the beginning of the
period, for which the proposed  transactions are being given effect nor are they
necessarily indicative of future operating results or financial position.
<PAGE>

<TABLE>
                                     KEYSPAN
            UNAUDITED PRO FORMA CONSOLIDATED CONDENSED BALANCE SHEET
                               SEPTEMBER 30, 2000
<CAPTION>
                                                                 Transaction                             Transaction
                                      KeySpan      Eastern       Adjustments   Pro Forma   EnergyNorth   Adjustments      Pro Forma
                                     ------------ ------------ -------------- ------------ -------------- ------------- ----------
                                                                                    (in thousands)
<S>                                  <C>           <C>          <C>             <C>          <C>         <C>            <C>
ASSETS
------
CURRENT ASSETS
   Cash and temporary cash
      investments                   $    63,618   $   39,122   $  (53,747)(4) $    48,993   $     175   $ (6,253) (11)  $  42,915
   Customer accounts receivable, net    806,087       74,397            -         880,484      14,478          -          894,962
   Other                                486,856      195,025            -         681,881      15,916          -          697,797
                                    -----------   ----------   ----------    ------------   ---------   --------    -------------
                                      1,356,561      308,544      (53,747)      1,611,358      30,569     (6,253)       1,635,674
                                    -----------   ----------   ----------    ------------   ---------   --------    -------------
EQUITY INVESTMENTS AND OTHERS           427,557       14,265            -         441,822           -          -          441,822
                                    -----------   ----------   ----------    ------------   ---------   --------    -------------

PROPERTY
   Electric                           1,386,206            -            -       1,386,206           -          -        1,386,206
   Gas                                3,584,690    1,538,249            -       5,122,939     179,838          -        5,302,777
   Other                                393,252      684,401            -       1,077,653       8,016          -        1,085,669
   Accumulated depreciation          (1,688,283)    (943,081)           -      (2,631,364)    (60,445)         -       (2,691,809)
   Gas exploration and production     1,346,357            -            -       1,346,357           -          -        1,346,357
   Accumulated depletion               (582,912)           -            -        (582,912)          -          -         (582,912)
                                    -----------   ----------   ----------    ------------   ---------   --------    -------------
                                      4,439,310    1,279,569            -       5,718,879     127,409          -        5,846,288
                                    -----------   ----------   ----------    ------------   ---------   --------    -------------
DEFERRED CHARGES
   Goodwill, net of amortization        350,552      242,497    1,126,767(1)    1,719,816           -    174,870(8)     1,894,686
   Regulatory assets and other          678,541      138,778       53,747(4)      881,815      15,164      6,253(11)      904,483
                                              -            -       10,749(2)            -           -      1,251(9)             -
                                    -----------   ----------   ----------    ------------   ---------   --------    -------------
                                      1,029,093      381,275    1,191,263       2,601,631      15,164    182,374        2,799,169
                                    -----------   ----------   ----------    ------------   ---------   --------    -------------
TOTAL ASSETS                        $ 7,252,521   $1,983,653   $1,137,516    $ 10,373,690   $ 173,142   $176,121    $  10,722,953
                                    ===========   ==========   ==========    ============   =========   ========    =============

LIABILITIES AND CAPITALIZATION
CURRENT LIABILITIES
  Current maturities of
    long-term debt                  $        - $       6,072   $        -     $    6,072    $    777           -    $       6,849
  Accounts payable and accrued
    expenses                           876,771       154,747            -      1,031,518      21,094           -        1,052,612
  Commercial paper                     382,090       121,990      276,907(1)     899,033      21,503      32,224(8)       970,847
                                              -             -        8,100(2)           -           -       2,100(9)             -
                                              -             -       99,197(3)           -           -      14,736(10)            -
                                              -             -       10,749(2)           -           -       1,251(9)             -
                                     ----------    ----------    ---------     ----------    --------   ---------    -------------
                                      1,258,861       282,809      394,953      1,936,623      43,374      50,311        2,030,308
                                     ----------    ----------    ---------     ----------    --------   ---------    -------------

DEFERRED CREDITS AND OTHER
  LIABILITIES
  Deferred income taxes                238,748       183,728            -        422,476      21,698           -          444,174
  Reserves and other liabilities       681,964       198,673            -        880,637       5,217           -          885,854
                                     ----------    ----------    ---------     ----------    --------   ---------    -------------
                                        920,712       382,401            -      1,303,113      26,915           -        1,330,028
                                     ----------    ----------    ---------     ----------    --------   ---------    -------------
GAS INVENTORY FINANCING                       -        59,657            -         59,657      11,455           -           71,112
                                     ----------    ----------    ---------     ----------    --------   ---------    -------------

CAPITALIZATION
   Long-term debt                     2,120,752       501,937    1,478,003(1)   4,100,692      45,211     171,997(8)     4,317,900
                                     ----------    ----------    ---------     ----------    --------   ---------    -------------
   Preferred stock                       84,323        16,737            -        101,060           -           -          101,060
                                     ----------    ----------    ---------     ----------    --------   ---------    -------------
   Common stock                       2,987,242       274,028     (274,028)(1)  2,991,914      35,966     (35,966)(8)    2,991,914

                                              -             -        4,672(3)           -           -           -                -
                                     ----------    ------------  ---------     ---------    ----------   --------     -------------
   Retained earnings                    481,658       466,512     (466,512)(1)    481,658      10,221     (10,221)(8)      481,658
   Accumulated comprehensive income      (6,476)          155         (155)(1)     (6,476)          -           -           (6,476)
   Treasury stock purchased            (702,435)         (583)         583(1)    (702,435)          -           -         (702,435)
                                     ----------    ----------    ---------     ----------    --------   ---------    -------------
     Total common shareholders
          equity                      2,759,989       740,112     (735,440)     2,764,661      46,187     (46,187)       2,764,661
                                     ----------    ----------    --------      ----------    --------   --------     -------------
Total capitalization                  4,965,064     1,258,786      742,563      6,966,413      91,398     125,810        7,183,621
                                     ----------    ----------    ---------     ----------    --------   ---------    -------------
MINORITY INTEREST                       107,884             -            -        107,884           -           -          107,884
                                     ----------    ----------    ---------     ----------    --------   ---------    -------------
TOTAL LIABILITIES AND CAPITALIZATION $7,252,521    $1,983,653    $1,137,516    $10,373,690   $173,142   $ 176,121    $  10,722,953
                                     ==========    ==========    =========     ==========    ========   ==========   =============
</TABLE>


<TABLE>
<CAPTION>
                                                                             KEYSPAN
                                                     UNAUDITED PRO FORMA CONSOLIDATED CONDENSED INCOME STATEMENT
                                                                    YEAR ENDED DECEMBER 31, 1999


                                                                 Transaction     Pro                     Transaction
                                        KeySpan       Eastern    Adjustments     Forma       EnergyNorth Adjustments   Pro Forma
                                        ----------- -----------  ----------     ------------ ----------  -------       ------------
                                                                          (dollars in thousands)
<S>                                     <C>            <C>       <C>             <C>           <C>       <C>              <C>
REVENUES
   Gas Distribution                     $1,753,132  $   690,809          -      $ 2,443,941  $  124,863           -    $   2,568,804
   Marine Services                               -      267,269          -          267,269           -           -          267,269
   Electric Services                       861,582            -          -          861,582           -           -          861,582
   Gas Exploration and Production          150,581            -          -          150,581           -           -          150,581
   Energy Related Services and Other       189,318       20,624          -          209,942           -           -          209,942
                                        ----------  -----------  ---------      ------------ ----------   ---------    -------------
     Total Revenues                      2,954,613      978,702          -        3,933,315     124,863           -        4,058,178
                                        ----------  -----------  ---------      ------------ ----------   ---------    -------------

OPERATING EXPENSES
   Purchased gas                           744,432      339,274          -        1,083,706      73,961           -        1,157,667
   Purchased fuel                           17,252            -          -           17,252           -           -           17,252
   Operations and maintenance            1,091,166      403,465          -        1,494,631      27,086           -        1,521,717
   Depreciation, depletion and
     amortization                          253,440       81,373     28,169(6)       362,982       7,845       4,372 (13)     375,199
   Operating taxes                         366,154       41,151          -          407,305       3,812           -          411,117
                                        ----------  -----------  ---------      -----------  ----------   ---------    -------------
     Total Operating Expenses            2,472,444      865,263     28,169        3,365,876     112,704       4,372        3,482,952
                                        ----------  -----------  ---------      -----------  ----------   ---------    -------------

OPERATING INCOME                           482,169      113,439    (28,169)         567,439      12,159      (4,372)         575,226
                                        ----------  -----------  ---------      -----------  ----------   ---------    -------------

OTHER INCOME AND (DEDUCTIONS)
   Income from equity investments           15,347            -          -           15,347           -           -           15,347
   Interest income                          26,993        7,964          -           34,957           -           -           34,957
   Minority interest                       (11,141)           -          -          (11,141)          -           -         (11,141)
   Other                                     6,297        8,980          -           15,277         525           -           15,802
                                        ----------  -----------  ---------      -----------  ----------   ---------    -------------
     Total Other Income                     37,496       16,944          -           54,440         525           -           54,965
                                        ----------  -----------  ---------      -----------  ----------   ---------    -------------

INCOME BEFORE INTEREST CHARGES
   AND INCOME TAXES                        519,665      130,383    (28,169)         621,879      12,684      (4,372)         630,191

INTEREST CHARGES                           124,692       37,274    147,220(5)       309,186       4,915      17,427 (12)     331,528
INCOME TAXES                               136,362       36,154    (51,527(7)       120,989       3,740      (6,099)(14)     118,630
NET INCOME                                 258,611       56,955   (123,862)         191,704       4,029     (15,700)         180,033

Preferred stock dividend requirements       34,752        1,862          -           36,614           -           -           36,614
Earnings for common stock               $  223,859  $    55,093  $(123,862)     $   155,090  $    4,029   $ (15,700)   $     143,419
                                        ==========  ===========  =========      ===========  ==========   =========    =============

Averages shares outstanding (000)          138,526            -          -          138,526           -           -          138,526
BASIC AND DILUTED EARNINGS PER
COMMON SHARE                            $   1.62              -          -      $    1.12             -           -    $     1.04
                                        ==========                              ===========                            =============
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
                                                                              KEYSPAN
                                                     UNAUDITED PRO FORMA CONSOLIDATED CONDENSED INCOME STATEMENT
                                                                NINE MONTHS ENDED SEPTEMBER 30, 2000


                                                                   Transaction                             Transaction
                                           KeySpan    Eastern      Adjustments   Pro Forma    EnergyNorth  Adjustments    Pro Forma
                                       -----------    ----------   ------------  ----------   -----------  -----------   -----------
                                                                                  (in thousands)
<S>                                     <C>           <C>           <C>        <C>           <C>             <C>           <C>

REVENUES

   Gas Distribution                    $ 1,458,595 $  576,084            -    $ 2,034,679  $   149,148            -     $  2,183,827
   Marine Services                               -    211,751            -        211,751            -            -          211,751
   Electric Services                     1,097,616          -            -      1,097,616            -            -        1,097,616
   Gas Exploration and Production          169,966          -            -        169,966            -            -          169,966
   Energy Related Services and Other       485,161     19,713            -        504,874            -            -          504,874
                                         ---------    -------    ---------      ---------     --------     --------     ------------
     Total Revenues                      3,211,338    807,548            -      4,018,886      149,148            -        4,168,034
                                         ---------    -------    ---------      ---------     --------     --------     ------------

OPERATING EXPENSES

   Purchased gas                           717,140    280,469            -        997,609       94,884            -        1,092,493
   Purchased fuel                          301,361          -            -        301,361            -            -          301,361
   Operations and maintenance            1,156,355    357,955            -      1,514,310       33,334            -        1,547,644
   Depreciation, depletion and
   amortization                            216,364     73,051       21,127(6)     310,542        8,408        3,279(13)    322,229
   Operating taxes                         298,010     34,424            -        332,434        4,154            -          336,588
                                         ---------    -------    ---------      ---------     --------     --------     ------------
     Total Operating Expenses            2,689,230    745,899       21,127      3,456,256      140,780        3,279        3,600,315
                                         ---------    -------    ---------      ---------     --------     --------     ------------

OPERATING INCOME                           522,108     61,649     (21,127)        562,630        8,368      (3,279)          567,719
                                         ---------    -------    ---------      ---------     --------     --------     ------------

OTHER INCOME AND (DEDUCTIONS)

   Income from equity investments           16,333          -            -         16,333            -            -           16,333
   Minority interest                      (13,747)          -            -       (13,747)            -            -         (13,747)
   Other                                     6,510      5,225            -         11,735          243            -           11,978
                                         ---------    -------    ---------      ---------     --------     --------     ------------
     Total Other Income                      9,096      5,225            -         14,321          243            -           14,564
                                         ---------    -------    ---------      ---------     --------     --------     ------------

INCOME BEFORE INTEREST CHARGES
AND INCOME TAXES                           531,204     66,874     (21,127)        576,951        8,611      (3,279)          582,283

INTEREST CHARGES                           120,106     34,139      110,415(5)     264,660        5,332      13,070 (12)      283,062

INCOME TAXES                               170,858     13,828     (38,645)(7)     146,041        3,137      (4,575)(14)      144,603

NET INCOME                                 240,240     18,907     (92,897)        166,250          142     (11,774)          154,618

Preferred stock dividend requirements       16,453      1,082            -         17,535            -            -           17,535
Earnings for common stock              $   223,787    $17,825    $(92,897)    $   148,715     $    142    $(11,774)     $    137,083
                                         =========    =======    =========      =========     ========    =========     ============

Averages shares outstanding (000)          133,965          -            -        133,965            -            -          133,965

BASIC AND DILUTED EARNINGS PER
COMMON SHARE                           $     1.67           -            -    $     1.11             -            -     $       1.02
                                         =========                              =========                               ============
</TABLE>


<PAGE>


                        NOTES TO THE UNAUDITED PRO FORMA
                   CONSOLIDATED CONDENSED FINANCIAL STATEMENTS
                     FOR THE PERIOD ENDED SEPTEMBER 30, 2000

NOTE 1.     CASH CONSIDERATION AND ESTIMATED GOODWILL RELATED TO THE EASTERN
            ACQUISITION

             Cash consideration paid to Eastern  shareholders will be refinanced
from the proceeds of the Notes and  commercial  paper  issuances.  We will issue
approximately  $1.478 billion of Notes at an estimated annual effective interest
rate of  8.149%  and  approximately  $277  million  of  commercial  paper  at an
estimated  annual  interest  rate of 6.78%.  We acquired all of the  outstanding
common stock of Eastern for $64.56 per share, in cash.

             The  estimated  goodwill  reflects  the  recognition  of the excess
amount of the  purchase  price over the fair  value of the net assets  acquired,
including costs incurred  directly  related to the  consummation.  The following
represents the estimated goodwill calculation:


Estimated Eastern common shares outstanding at date of closing        27,183,454
Share price                                                      $       64.558
                                                                  --------------
Purchase price                                                   $ 1,754,909,423
Common equity of Eastern                                           (740,112,000)
                                                                  --------------
                                                                 $ 1,014,797,423
Estimated transaction costs (see note 2)                               8,100,000
Estimated restructuring and other costs (see note 3)                 103,870,000
                                                                  --------------
Estimated goodwill                                               $ 1,126,767,423
                                                                  ==============
Amortization period                                                           40
Estimated yearly amortization                                    $    28,169,186
Estimated nine months amortization                               $    21,126,889

             A final  determination of goodwill will reflect purchase accounting
adjustments  based  on the  fair  value  of  assets  and  liabilities  acquired,
actuarial  valuations related to employee benefit plans,  estimates with respect
to the  effect of  consolidation  of  corporate  and  administrative  functions,
completion of studies related to  environmental  issues,  possible  contract and
asset impairment charges, possible asset sales, and other adjustments.

NOTE 2.      ESTIMATED TRANSACTION COSTS ASSOCIATED WITH THE EASTERN ACQUISITION

             We  have  incurred  direct  expenses  related  to the  acquisition,
including  accounting,  investment  banking,  legal and consulting fees. The pro
forma adjustments include an estimate for these costs of $8.1 million,  which is
included in  goodwill.  These costs will be  refinanced  through the issuance of
commercial paper. We will also incur  underwriting  fees of approximately  $10.7
million.  These costs will be amortized to interest expense over the life of the
related debt and will be financed through the issuance of commercial paper.

NOTE 3.      ESTIMATED RESTRUCTURING AND OTHER COSTS ASSOCIATED WITH THE EASTERN
             ACQUISITION

             Eastern has incurred  direct expenses  related to the  acquisition,
including  accounting,   investment  banking,  legal  and  consulting  fees,  of
approximately  $13.9  million.   In  addition,   Eastern  incurred  expenses  of
approximately  $76.3  million for  contractual  obligations,  such as "change in
control" payments and non-qualified stock options, that were "cashed out." These
costs have been  expensed as  incurred by Eastern and have been  included in the
calculation of estimated  goodwill.  These costs will be refinanced  through the
issuance of commercial  paper.  Eastern has also incurred costs of approximately
$9 million  associated  with a  severance  program.  These  costs have also been
included in the calculation of estimated  goodwill and will be financed  through
the issuance of commercial paper.  Further,  some Eastern options were converted
to options to purchase KeySpan stock. The estimated value of such options, which
were  primarily  fully  vested,  approximated  $4.7 million and were recorded as
additional purchase price consideration by us.


<PAGE>


NOTE 4.              FORWARD STARTING SWAP AGREEMENT

             In anticipation of issuing  long-term debt, we entered into forward
starting  swap  agreements  to hedge a portion  of the risk that the cost of the
issuance of the Notes would be adversely  affected by changes in interest rates.
Through  September 30, 2000,  we entered into $1.35 billion of forward  starting
swap  agreements  with  interest  rates that  ranged  from  6.86% to 7.78%.  The
maturities  on these  instruments  range from 5 to 30 years.  Based on  interest
rates  effective as of October 30, 2000, we estimate that we may be obligated to
pay counterparties  approximately $54 million at the time of the issuance of the
Notes.  This amount will be amortized  to interest  expense over the life of the
Notes and reflects the  significant  decrease in interest rates since we entered
into the forward starting swap lock agreements.

NOTE 5.              INTEREST EXPENSE ASSOCIATED WITH THE EASTERN ACQUISITION

             Interest  expense  reflects  the issuance of  approximately  $1.478
billion of Notes and approximately $277 million of commercial paper to refinance
a portion of the Bridge Financing and other commercial  paper,  which was issued
to finance a portion of the  acquisition  price of Eastern at  estimated  annual
effective interest rates of 8.149% and 6.78%,  respectively.  The long-term debt
interest rate is an  all-inclusive  rate that reflects the rates associated with
our forward starting swap agreements, as well as our estimated credit spread and
an estimate for the  amortization of underwriting  fees.  Interest  expense also
reflects  the  issuance  of  commercial  paper to finance  transaction  costs of
approximately  $118 million at an estimated  annual  interest  rate of 6.78%.  A
change in the actual  interest  rate of 0.125%,  as  compared  to the  estimated
interest rates,  will change net income by  approximately  $1.5 million annually
and by $1.1 million for nine months.

NOTE 6.         AMORTIZATION OF GOODWILL ASSOCIATED WITH THE EASTERN ACQUISITION

             Goodwill, which is not tax deductible,  will be amortized over a 40
year period.

NOTE 7.              INCOME TAXES ASSOCIATED WITH THE EASTERN ACQUISITION

             Income  taxes on the  unaudited  pro forma  consolidated  condensed
income  statement  have been  adjusted to reflect the tax  deduction of interest
expense at a rate of 35%. A tax benefit has not been provided for goodwill since
it is not tax deductible.

NOTE 8.           CASH CONSIDERATION AND ESTIMATED GOODWILL ASSOCIATED WITH THE
                  ENERGYNORTH ACQUISITION

             Cash  consideration  paid  to  EnergyNorth   shareholders  will  be
refinanced  from the proceeds of the Notes and commercial  paper  issuances.  We
will issue  approximately $172 million of Notes at an estimated annual effective
interest rate of 8.149% and  approximately $32 million of commercial paper at an
estimated  annual  interest  rate of 6.78%.  We acquired all of the  outstanding
common stock of EnergyNorth for $61.46 per share, in cash.


<PAGE>


           The estimated  goodwill reflects the recognition of the excess amount
of the purchase price over the fair value of the net assets acquired,  including
adjustments  for  costs  incurred  directly  related  to the  consummation.  The
following represents the estimated goodwill calculation:


Estimated EnergyNorth common shares outstanding at date of closing    3,322,903
Share price                                                       $     61.4587
                                                                  -------------
Purchase price                                                    $ 204,221,299
Common equity of EnergyNorth                                       (46,187,000)
                                                                  -------------
                                                                  $ 158,034,299
Estimated transaction costs (see note 9)                              2,100,000
Estimated restructuring and other costs (see note 10)                14,736,000
                                                  --              -------------
Estimated goodwill                                                $ 174,870,299
                                                                  =============
Amortization period                                                          40
Estimated yearly amortization                                     $   4,371,757
Estimated nine month amortization                                 $   3,278,818

             A final  determination of goodwill will reflect purchase accounting
adjustments  based  on the  fair  value  of  assets  and  liabilities  acquired,
actuarial  valuations related to employee benefit plans,  estimates with respect
to the  effect of  consolidation  of  corporate  and  administrative  functions,
completion of studies related to  environmental  issues,  possible  contract and
asset impairment charges, possible asset sales, and other adjustments.

NOTE 9.      ESTIMATED TRANSACTION COSTS ASSOCIATED WITH THE ENERGYNORTH
             ACQUISITION

             Together,  we and Eastern have incurred direct expenses  related to
the EnergyNorth acquisition, including accounting, investment banking, legal and
consulting fees. The pro forma  adjustments  include an estimate for these costs
of $2.1 million,  which is included in goodwill.  These costs will be refinanced
through the issuance of commercial paper. We and Eastern will incur underwriting
fees of  approximately  $1.3 million.  These costs will be amortized to interest
expense  over the life of the  related  debt and will be  financed  through  the
issuance of commercial paper.

NOTE 10.     ESTIMATED RESTRUCTURING AND OTHER COSTS ASSOCIATED WITH THE
             ENERGYNORTH ACQUISITION

             EnergyNorth   has   incurred   direct   expenses   related  to  the
acquisition,  including  accounting,  investment  banking,  legal and consulting
fees, of approximately $4.7 million. In addition,  EnergyNorth incurred expenses
of  approximately  $10 million for contractual  obligations,  such as "change in
control" payments. These costs were expensed as incurred by EnergyNorth and have
been  included in the  calculation  of estimated  goodwill.  These costs will be
refinanced through the issuance of commercial paper.

NOTE 11.     FORWARD STARTING SWAP AGREEMENT

             In anticipation of issuing  long-term debt, we entered into forward
starting  swap  agreements  to  hedge a  portion  of the  risk  that the cost of
issuance of the Notes would be adversely  affected by changes in interest rates.
Through  September  30, 2000,  we entered into $150 million of forward  starting
swap  agreements  with  interest  rates that  ranged  from  6.86% to 7.78%.  The
maturities  on these  instruments  range from 5 to 30 years.  Based on  interest
rates  effective as of October 30, 2000, we estimate that we may be obligated to
pay  counterparties  approximately $6 million at the time of the issuance of the
Notes.  This amount will be amortized  to interest  expense over the life of the
Notes and reflects the  significant  decrease in interest rates since we entered
into the forward starting swap lock agreements.


<PAGE>


NOTE 12.     INTEREST EXPENSE ASSOCIATED WITH THE ENERGYNORTH ACQUISITION

             Interest  expense  reflects  the  issuance  of  approximately  $172
million of Notes and  approximately $32 million of commercial paper to refinance
the Bridge Financing and other commercial  paper,  which was issued to finance a
portion of the acquisition  price of EnergyNorth at estimated  effective  annual
interest  rates of 8.149% and 6.78%,  respectively.  The long-term debt interest
rate is an  all-inclusive  rate  that  reflects  the rates  associated  with our
forward starting swap agreements,  as well as our estimated credit spread and an
estimate  for the  amortization  of  underwriting  fees.  Interest  expense also
reflects  the  issuance  of  commercial  paper to finance  transaction  costs of
approximately  $18.1 million at an estimated  annual  interest rate of 6.78%.  A
change in the actual  interest  rate of 0.125%,  as  compared  to the  estimated
interest rates,  will change net income by  approximately  $0.2 million annually
and have an immaterial effect on net income for the nine month period.

NOTE 13.    AMORTIZATION OF GOODWILL ASSOCIATED WITH THE ENERGYNORTH ACQUISITION

             Goodwill, which is not tax deductible,  will be amortized over a 40
year period.

NOTE 14.     INCOME TAXES ASSOCIATED WITH THE ENERGYNORTH ACQUISITION

             Income  taxes on the  unaudited  pro forma  consolidated  condensed
income  statement  have been  adjusted to reflect the tax  deduction of interest
expense at a rate of 35%. A tax benefit has not been provided for goodwill since
it is not tax deductible.














<PAGE>



                MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
                       CONDITION AND RESULTS OF OPERATIONS

CONSOLIDATED RESULTS

           The  following  is a  summary  of  items  affecting  our  comparative
earnings and a discussion  of material  changes in revenues and expenses  during
the nine month period ended September 30, 2000 compared to the nine month period
ended September 30, 1999. For both periods presented, diluted earnings per share
is the same as basic  earnings per share,  since there was no effect on earnings
per share from our  outstanding  options.  This  summary  does not  include  any
discussion of the financial results of Eastern or EnergyNorth.

EARNINGS SUMMARY

           Earnings  (loss) by reporting  segment is set forth in the  following
table for the periods indicated:


                                                       NINE MONTHS ENDED
                                                         SEPTEMBER 30,
                                           -------------------------------------
                                                 1999                   2000
                                           ----------------      ---------------
                                                        (in thousands)

Gas distribution                           $     92,873      $          101,025
Electric services                                59,786                 103,316
Gas exploration and production                    9,239                  29,381
Energy services                                  (2,384)                 25,221
Energy investments                                5,937                   7,877
Other                                           (16,292)                (43,033)
                                           ------------         ---------------
Consolidated earnings                      $    149,159      $          223,787
                                           ============         ===============


           Consolidated  earnings were $1.67 per share for the nine months ended
September 30, 2000, compared to $1.06 per share for the corresponding  period in
1999. Our average common shares  outstanding for the nine months ended September
30, 2000 were approximately 4% less than the same period last year.

           The  increase  in  consolidated   earnings   primarily  reflects  the
operations of the 2,168 megawatt Ravenswood electric generating facility located
in Queens,  New York,  which was acquired in June 1999, as well as earnings from
our energy services segment which primarily  reflect earnings from  intercompany
fuel  procurement  and energy  management  services  provided to the  Ravenswood
facility.

           The increase in earnings  from the gas  distribution  segment for the
nine months ended September 30, 2000,  compared to the  corresponding  period in
1999,  reflects  revenue  benefits from continued gas sales growth and favorable
gas prices compared to oil prices.

           Consolidated  earnings for the nine months ended  September 30, 2000,
also  reflect  improved  performance  from our gas  exploration  and  production
segment,  which  benefitted  from  significantly  higher realized gas prices and
increased  production  volumes compared to last year. In addition,  on March 31,
2000, we increased our ownership in Houston Exploration from 64% to 70%.

           Partially  offsetting  the  aforementioned  benefits  to  comparative
earnings  were  certain  corporate  expenses  which have not been  allocated  to
operating  segments.  We also made an  additional  contribution  to the  KeySpan
Foundation,  a not-for-profit  philanthropic  foundation that makes donations to
local  charitable  community  organizations.  In  addition,  we  realized  lower
interest income on temporary cash investments  compared to the nine months ended
September 30, 1999 because we have used cash to repurchase  shares of our common
stock and to finance acquisitions and joint venture investments.

                                      S-13

<PAGE>



           REVENUES

           For the nine months ended September 30, 2000,  consolidated  revenues
were $3.2 billion,  compared to $2.0 billion for the  corresponding  period last
year,  an increase of $1.2 billion or 57%. The increase in revenues for the nine
months ended September 30, 2000 is due primarily to:

     o    an increase of $457.8 million from the Ravenswood facility;

     o    an increase in gas distribution revenues of $250.3 million; and

     o    an increase of $357.3 million in revenues from the energy services

          segment.

           Revenues from the  Ravenswood  facility  benefitted  from the sale of
energy,  capacity  and  ancillary  services to the New York  Independent  System
Operator  at  competitive  market  prices.  Prior  to the  start of the New York
Independent System Operator on November 19, 1999, all of the energy and capacity
from the Ravenswood facility was sold to Consolidated Edison Company of New York
on a cost recovery and fixed fee basis.

           Revenues from the gas distribution  segment benefitted from continued
gas sales growth and favorable gas prices compared to oil prices.  Revenues from
the gas  distribution  segment also included  recovery of gas costs,  which have
been higher in 2000 compared to 1999.

           The increase in revenues from the energy  services  segment  resulted
from recent acquisitions of companies providing various energy-related  services
throughout  the New York tri-state  metropolitan  area,  Pennsylvania  and Rhode
Island, and sales growth related to our gas and electric  marketing  subsidiary,
KeySpan Energy Supply, LLC.

           OPERATING EXPENSES

           Consolidated  operating  expenses for the nine months ended September
30, 2000 were $2.7 billion compared to $1.7 billion for the corresponding period
last year,  an increase of $1.0  billion,  or 58%.  The  increases  in operating
expenses were primarily the result of higher  purchased fuel and gas costs,  and
higher operations and maintenance expenses. Fuel and purchased power expense for
the operation of the Ravenswood  facility was $235.1 million for the nine months
ended  September  30, 2000.  We did not incur any fuel costs for the  Ravenswood
facility for the corresponding period in 1999. The prior owner of the Ravenswood
facility,  Consolidated Edison, owned and supplied the fuel necessary to operate
the  Ravenswood  facility  from June 19,  1999,  until the start of the New York
Independent  System Operator on November 19, 1999.  During that time, all of the
energy generated by the Ravenswood facility was supplied to Consolidated Edison.
Purchased  fuel expense  also  reflects  costs  incurred by our gas and electric
marketing   subsidiary  which  began  providing   residential,   commercial  and
industrial customers with electricity sales in January 2000.

           The  increase in gas cost for the nine  months  ended  September  30,
2000,  compared  to the same period last year,  resulted  from gas sales  growth
associated  with  our two New  York gas  distribution  subsidiaries  and our gas
marketing  subsidiary,  as well as higher gas prices.  Variations in utility gas
costs have  little  impact on  operating  results  because  the current gas rate
structure of each of our two New York gas distribution  utilities includes a gas
adjustment  clause under which variations  between actual gas costs and gas cost
recoveries  are  deferred  and  subsequently   refunded  to  or  collected  from
customers. However, fluctuations in gas costs can affect earnings of our gas and
electric marketing subsidiary,  which in response,  employs derivative financial
instruments  to hedge a portion of the risk  associated  with future  higher gas
costs.

           Operations and maintenance expenses have increased by $358.4 million,
or  47%,  for  the  nine  months  ended  September  30,  2000  compared  to  the
corresponding  period in 1999,  primarily as a result of recent  acquisitions of
companies  providing  various  energy-related  services,  the  operations of the
Ravenswood facility and the installation of an underground  transmission line to
reinforce  the  electric  system  capacity  on the south fork of Long  Island on
behalf of the Long Island Power Authority.


                                      S-14

<PAGE>



           OTHER INCOME AND (DEDUCTIONS)

           Other income includes equity income from subsidiaries  comprising the
energy  investments  segment,  primarily our investments in Canada. In addition,
other income also includes interest income from temporary cash investments,  the
effect on net  income  from the  minority  interest  associated  primarily  with
Houston Exploration,  as well as non-operating expenses. We recorded a charge of
$5.0  million  during  the  period  ended  September  30,  2000,   reflecting  a
contribution  to the KeySpan  Foundation.  Further,  for the nine  months  ended
September 30, 2000,  other income  includes a charge of $9.0 million  related to
rate  settlement  issues,  compared to a charge of $6.0 million  recorded in the
nine months ended  September 30, 1999. We also realized lower interest income on
temporary cash investments as compared to the same period last year.

           OTHER EXPENSES

           Interest  expense was $21.3 million  higher for the nine months ended
September  30,  2000,  compared to the  corresponding  period in 1999.  Interest
expense for the period ended  September 30, 2000 reflects  higher levels of debt
outstanding,  primarily  related to medium terms notes issued in February  2000,
debt  associated  with our  Canadian  investments  and higher  commercial  paper
borrowings.

           Income tax expense  reflects the higher  level of pre-tax  income for
the nine months ended September 30, 2000,  compared to the corresponding  period
in 1999.  Further,  during the nine months ended  September 30, 2000, we changed
our basis for computing local income taxes which  contributed to the increase in
income tax expense.  Income tax expense for the nine months ended  September 30,
1999 also reflects an adjustment to deferred tax expense and current tax expense
for the  utilization  of previously  deferred net operating  loss  carryforwards
recorded in 1998.  In 1998, we recorded,  as a deferred tax asset,  a benefit of
$71.1  million for net operating  loss  carryforwards.  We estimated  that $57.4
million of the benefits  from the net  operating  loss  carryforwards  from 1998
would be realized in our consolidated 1999 federal and state income tax returns,
and accordingly, applied the net operating loss benefits in our 1999 federal and
state tax provisions.


RECENT DEVELOPMENTS

           ACQUISITION OF EASTERN

           On November 8, 2000,  we acquired  all of the common stock of Eastern
and EnergyNorth in an all cash acquisition.

           The goodwill  associated with the transactions is currently estimated
to be approximately  $1.3 billion.  Consolidated  proforma income statements for
the twelve months ended December 31, 1999, including future interest expense and
the  amortization  of  goodwill,  indicate  that the  transactions  will  have a
dilutive  effect  on net  income.  However,  the  consolidated  proforma  income
statement does not include:

     o    continued  gas  sales  growth   throughout   our  service   territory,
          especially on Long Island and New England;

     o    earnings enhancement from our investment in the Ravenswood facility;

     o    the continued  successful  integration of acquired companies providing
          energy-related services within our energy services segment; and

     o    anticipated   before-tax  synergy  savings  of  $40  million  annually
          starting in 2001.

           We currently expect that these earnings  enhancements will offset the
dilutive  effects of the Eastern and  EnergyNorth  transactions,  and we believe
that  year-end  earnings  in 2000 could be as much as 40% higher  than  earnings
achieved in 1999, excluding the impact of transaction and restructuring  charges
to be recorded in the fourth quarter of 2000 which are currently estimated to be
at least $50 million. We are also completing our resource allocation process for
2001 and believe that we will achieve the growth and synergy  savings  projected
as part of the Eastern and EnergyNorth acquisitions.


                                      S-15

<PAGE>



           In line  with our  objective  to  realize  synergy  savings,  we have
implemented  an  early  retirement  program  and  targeted  voluntary  severance
programs. Further, we anticipate disposing of some of our non-core assets (I.E.,
assets  other than  those  associated  with our gas  distribution  and  electric
generation  operations) within the next several years. However, we are unable to
predict  when or if any such sales will occur or their  impact on our results of
operations or financial condition.

           Following our  announcement  that we had entered into an agreement to
purchase  Eastern,  Standard & Poor's  Rating  Services  placed  our, as well as
Eastern's,  corporate  credit,  senior  unsecured  debt, and preferred  stock on
credit watch with negative  implications.  Similarly,  Moody's Investors Service
also placed our, as well as Eastern's,  corporate credit, senior unsecured debt,
commercial  paper and  preferred  stock on review for  possible  downgrade.  The
rating agencies have finalized their review process.  Moody's has reaffirmed our
long-term A3 issuer  rating,  and Standard & Poor has upgraded us to an A issuer
rating.

SEGMENT RESULTS

GAS DISTRIBUTION

           KeySpan Energy Delivery New York provides gas  distribution  services
to  customers  in the New York City  Boroughs  of  Brooklyn,  Queens  and Staten
Island,  and KeySpan  Energy  Delivery  Long Island  provides  gas  distribution
services to customers in the Long Island  counties of Nassau and Suffolk and the
Rockaway Peninsula of the Borough of Queens.

           The table below highlights  significant  financial data and operating
statistics for the gas distribution segment for the periods indicated.


                                                          NINE MONTHS ENDED
                                                            SEPTEMBER 30,
                                                -------------------------------
                                                       1999             2000
                                                ------------------ -------------
                                                          (dollars in thousands)

Revenues                                        $    1,208,254      $  1,458,595
Purchased gas for resale                               470,633           663,246
Revenue taxes                                           75,578            78,695
                                                --------------      ------------
      Net Revenues                                     662,043           716,654
                                                --------------      ------------
Operations and maintenance                             306,364           323,401
Depreciation and amortization                           73,235            86,698
Operating taxes                                         83,879            93,867
                                                --------------      ------------
      Total Operating Expenses                         463,478           503,966
                                                --------------      ------------
Operating Income                                $      198,565      $    212,688
                                                ==============      ============
Firm gas sales (MDTH) (1)                              120,401           125,318
Firm transportation (MDTH)                              15,030            19,306
Transportation - Electric Generation (MDTH)             61,763            45,342
Other sales (MDTH)                                      38,279            67,380
Warmer than normal                                        9.7%              5.9%
---------------------
(1)   A MDTH is 10,000 therms  (British  Thermal Units) and reflects the heating
      content of  approximately  one million cubic feet of gas. A therm reflects
      the heating  content of  approximately  100 cubic feet of gas. One billion
      cubic feet (BCF) of gas equals approximately 1,000 MDTH.



                                      S-16

<PAGE>



           NET REVENUES

           Net gas  revenues  for the nine  months  ended  September  30,  2000,
increased by $54.6 million,  or 8%,  compared to the  corresponding  period last
year. The increase in net gas revenues was due to continued gas sales growth and
favorable  gas  prices  compared  to oil  prices.  Firm  net gas  revenues  grew
approximately  $26 million for the nine months ended September 30, 2000 over the
corresponding  period in 1999, through the addition of new gas customers and oil
to gas conversions,  primarily in the Long Island market.  Long Island has a low
natural gas saturation rate and significant gas sales growth  opportunities  are
believed to be  available.  We estimate that on Long Island less than 30% of the
residential and multi-family  markets,  and  approximately 70% of the commercial
market  currently use natural gas for space heating.  In the Long Island service
area, we will continue to seek growth through the expansion of our  distribution
system,  as well as through the conversion of residential  homes from oil-to-gas
for  space  heating   purposes  and  the  pursuit  of   opportunities   to  grow
multi-family, industrial and commercial markets.

           In the large volume heating markets and other interruptible  markets,
which include large  apartment  houses,  government  buildings and schools,  gas
service  is  provided  under  rates  that  are set to  compete  with  prices  of
alternative fuel, including No. 2 and No. 6 grade heating oil. The price of both
heating grade fuel oil and natural gas have increased  significantly  during the
past few months.  During the nine months ended September 30, 2000, gas generally
sold at a slight discount to heating oil. We increased sales in these markets by
approximately $23 million for the nine months ended September 30, 2000, compared
to the same period in 1999,  through aggressive unit pricing and the addition of
two large commercial and industrial customers.

           The gas  distribution  segment  is  influenced  by  seasonal  weather
conditions.  Annual gas revenues are  substantially  realized during the heating
season  (November 1 to April 30) as a result of the large  proportion of heating
sales, primarily residential, compared with total sales. Accordingly, results of
operations for gas  distribution  operations  historically are most favorable in
the three  months  ended March 31, with  results of  operations  being next most
favorable in the three months ended  December 31.  Results for the quarter ended
June 30 are  marginally  profitable  or  unprofitable,  and losses are generally
incurred in the quarter ended September 30.

           Our New York gas  distribution  subsidiaries  operate  under  utility
tariffs  that each  contain  a weather  normalization  adjustment  that  largely
offsets  shortfalls  or excesses of firm net revenues  (i.e.,  revenues less gas
costs and revenue taxes) during a heating  season due to variations  from normal
weather.

           SALES, TRANSPORTATION AND OTHER QUANTITIES

           Comparative firm gas sales and transportation quantities for the nine
months  ended  September  30,  2000,  reflect the  increase  in firm  sales,  as
discussed above. Firm gas transportation quantities increased in the nine months
ended  September  30,  2000,  as  we  continued  our  natural  gas  deregulation
initiatives.  Our net margins are currently not affected by customers  opting to
purchase their gas supply from sources other than us, since  distribution  rates
charged to transportation  customers are the same as those charged to full sales
service customers.

           Transportation  quantities related to electric generation reflect the
transportation  of gas to our  electric  generating  facilities  located on Long
Island. Net revenues from these services are minimal.

           Other sales quantities  include on-system  interruptible  quantities,
off-system  sales  quantities  (sales  made  to  customers  out of  our  service
territories)  and related  transportation.  Effective  April 1, 2000, we entered
into an agreement with Coral Resources, L.P., a subsidiary of Shell Oil Company.
Coral  assists in the  origination,  structuring,  valuation  and  execution  of
energy-related transactions. A sharing exists between gas ratepayers and our two
New York gas  distribution  subsidiaries  for off-system gas  transactions.  Our
share of the profits on such  transactions  is then  shared with Coral.  We also
share in revenues arising from  transactions  initiated by Coral.  Prior to this
agreement  with Coral,  KeySpan  Energy  Delivery  New York had a gas supply and
asset  management  agreement  with Enron Capital and Trade  Resources  Corp. and
obtained the right to earn revenues based upon its  management of KeySpan.  As a
result of the Enron  agreement,  KeySpan Energy Delivery New York did not report
any off-system sales quantities in 1999.


                                      S-17

<PAGE>



           OPERATING EXPENSES

           Operating  expenses  increased by $40.5 million,  or 9%, for the nine
months ended September 30, 2000, compared to the same period in 1999. Operations
and maintenance  expense  reflects  generally  higher labor costs and associated
employee benefit  expenses and higher marketing costs and incentives  related to
our gas expansion  initiatives on Long Island.  The increase in depreciation and
amortization  expense generally reflect continued  property  additions,  and the
amortization  of certain  regulatory  items  previously  deferred  and now being
recovered through revenue recovery  mechanisms.  Further,  operating taxes which
include  state and local  taxes on property  have  increased  as the  applicable
property base and tax rates generally have increased.

ELECTRIC SERVICES

           The electric services segment primarily consists of subsidiaries that
own,  lease and operate oil and gas fired  generating  plants in Queens and Long
Island, and through long-term  contracts,  manage the electric  transmission and
distribution  system,  the  fuel  and  electric  purchases,  and the  off-system
electric sales for the Long Island Power Authority.

           Selected  financial  data for the  electric  services  segment is set
forth in the table below for the periods indicated.


                                                      NINE MONTHS ENDED
                                                        SEPTEMBER 30,
                                           -------------------------------------
                                                 1999                  2000
                                           -----------------    ----------------
Revenues                                            (dollars in thousands)

  LIPA service agreements                  $      536,428       $       569,691
  Ravenswood facility                              70,124               527,925
                                           --------------       ---------------
     Total Revenues                               606,552             1,097,616
Purchased fuel                                          -               235,131
                                           --------------       ---------------
Net Revenues                                      606,552               862,485
                                           --------------       ---------------
  Operations and maintenance                      367,078               503,234
  Depreciation                                     32,660                36,814
  Operating taxes                                  94,162               117,603
                                           --------------       ---------------
     Total Operating Expenses                     493,900               657,651
                                           --------------       ---------------
Operating Income                           $      112,652       $       204,834
                                           ==============       ===============
Electric Sales (MWh)                            2,155,496             4,013,843
Cooling degree days                                 1,146                 1,124
Capacity (MW)                                       2,120                 2,294

           NET REVENUES

           Electric net revenues  increased by $255.9  million,  or 42%, for the
nine months ended  September 30, 2000,  compared to the same period in 1999. The
increase in electric net revenues is due primarily to the  Ravenswood  facility.
Revenues  from the  Ravenswood  facility  benefitted  from  the sale of  energy,
capacity and ancillary  services to the New York Independent  System Operator at
competitive market prices, and from effective hedging  strategies.  Prior to the
start  of the New  York  Independent  System  Operator,  all of the  energy  and
capacity from the Ravenswood  facility was sold to Consolidated Edison on a cost
recovery and fixed fee basis. There were no sales of ancillary services in 1999.

           Purchased fuel expense for the operation of the  Ravenswood  facility
was $235.1  million for the nine months ended  September  30,  2000.  We did not
incur any fuel costs for the Ravenswood facility for the corresponding period in
1999. Consolidated Edison owned and supplied the fuel necessary to operate the

                                      S-18

<PAGE>



Ravenswood facility from the time we acquired it until the start of the New York
Independent System Operator on November 19, 1999.

           Net revenues from our service  agreements  with the Long Island Power
Authority were $33.3 million higher for the nine months ended September 30, 2000
compared  to the  corresponding  period last year.  The  increase in revenues is
primarily the result of a major  construction  project performed by us on behalf
of the Long Island Power Authority.  In June 2000, we completed the installation
of an underground transmission line to reinforce the electric system capacity on
the south fork of Long  Island.  The  project  was  performed  under a fixed fee
contract with the Long Island Power Authority as part of our management services
agreement.

           Further,  revenues  for the nine  months  ended  September  30,  2000
include $14 million of off-system sales from our Long Island electric generation
units.  Under the terms of the energy management  agreement with the Long Island
Power Authority,  we are entitled to one-third of the profit from any off-system
electricity sales arranged by us on the Long Island Power Authority's behalf.

           We have  realized  significant  revenues and profits from the sale of
energy, capacity and ancillary services from the Ravenswood facility and through
the energy management  agreement.  Ancillary services include primarily spinning
reserves  and  non-spinning  reserves.  Due to the  significant  increase in the
market-clearing  price for electricity and certain ancillary  services,  the New
York Independent  System Operator and other market  participants  have requested
that the Federal  Energy  Regulatory  Commission  cap the sales  prices for both
energy sales and the sale of ancillary services.  See Note 6 to the Consolidated
Financial Statements, "New York State Independent System Operator Matters" for a
further discussion of these matters.

           OPERATING EXPENSES

           Operating  expenses  for the nine months  ended  September  30, 2000,
increased by $163.8  million,  or 33%,  compared to the same period in 1999. The
increase in operating expenses in 2000, reflects primarily the operations of the
Ravenswood facility.  Operating expenses associated with the Ravenswood facility
increased  by $120.2  million  for the nine months  ended  September  30,  2000,
compared to the corresponding  period of 1999. Since the Ravenswood facility was
acquired by us in June 1999,  operating  expenses for the period ended September
30, 2000 reflect a full nine months of operations  compared to only three months
of operations for the period ended September 30, 1999.

           Included  in  operating  expenses  for the  Ravenswood  facility  are
charges of $48.7 million for the nine months ended  September 30, 2000, for fuel
management services provided by a subsidiary within the energy services segment.
There were no comparable charges in 1999.

           Operating  expenses  incurred  by us  under  the  Long  Island  Power
Authority  service  agreements  increased  by $43.5  million for the nine months
ended  September 30, 2000 compared to the  corresponding  period last year,  due
primarily  to costs  incurred  to install  the new  electric  transmission  line
discussed above.

           EARNINGS

           In  addition to the  aforementioned,  earnings  available  for common
stock for the nine months ended  September  30, 2000 also reflect an  allocation
for interest  expense,  city,  state and federal  income tax  provisions,  and a
charge, net of tax, of $2.2 million for the loss on the sale of selected assets.

           OTHER ISSUES

           We have  filed  an  application  with  the New  York  Public  Service
Commission  to  build  a new 250 MW  cogeneration  facility  at the  site of the
Ravenswood  facility.  The new  facility,  which will generate  electricity  and
steam,  is expected to be in service in 2003.  Further,  we continue to evaluate
the electric needs on Long Island and may, if economic  circumstances and energy
needs so warrant, proceed with strategies to add additional electric capacity on
Long Island.


                                      S-19

<PAGE>



GAS EXPLORATION AND PRODUCTION

           The gas exploration and production  segment is engaged in gas and oil
exploration  and  production,  and the  development  and acquisition of domestic
natural gas and oil properties. This segment consists of our 70% equity interest
in Houston Exploration,  as well as KeySpan Exploration and Production, LLC, our
wholly owned subsidiary engaged in a joint venture with Houston Exploration.  On
March 31, 2000,  under a  pre-existing  credit  arrangement,  approximately  $80
million in debt owed by Houston  Exploration  to us was  converted  into Houston
Exploration  common equity.  Upon that  conversion,  our common equity ownership
interest in Houston Exploration increased from 64% to approximately 70%.

           Selected  financial  data  and  operating   statistics  for  the  gas
exploration and production  segment are set forth in the following table for the
periods indicated.


                                                        NINE MONTHS ENDED
                                                          SEPTEMBER 30,
                                             -----------------------------------
                                                   1999                  2000
                                             -----------------    --------------
                                                     (dollars in thousands)

Revenues                                     $       103,622      $      169,966
Depreciation and amortization                         53,673              65,257
Other operating expenses                              20,070              32,195
                                             ---------------      --------------
Operating income                             $        29,879      $       72,514
                                             ===============      ==============
Natural gas production (Mmcfe)                        51,572              58,228
Natural gas (per Mcf) realized               $          2.00      $         2.88
Natural gas (per Mcf) unhedged               $          2.05      $         3.33

           Operating  income above  represents  100% of our gas  exploration and
production subsidiaries' results for the periods indicated.  Earnings,  however,
are adjusted to reflect our minority interest and,  accordingly,  include 70% of
Houston   Exploration's  results  since  April  1,  2000,  and  64%  of  Houston
Exploration's  results for all periods prior to March 31, 2000. Gas reserves and
production are stated in BCFe and Mmcfe, which includes equivalent oil reserves.

           OPERATING INCOME

           Operating income increased by $42.6 million for the nine months ended
September 30, 2000,  compared to the corresponding  period in 1999. For the nine
months ended September 30, 2000,  operating income reflects the benefits derived
from a 13%  increase in  production  volumes,  combined  with a 44%  increase in
average realized gas prices (average  wellhead price received for production for
the nine months ended  September  30, 2000,  plus hedging gains and losses) over
comparable  amounts for the corresponding  period in 1999. At December 31, 1999,
our gas  exploration  and  production  subsidiaries  had 553 BCFe of net  proved
reserves of natural gas, of which  approximately  75% were  classified as proved
developed.

ENERGY SERVICES

           Our energy services segment primarily includes companies that provide
services  through four lines of business to clients  located within the New York
tri-state  metropolitan  area,  Pennsylvania  and in Rhode Island.  The lines of
business include:

          o          home energy services;
          o          business solutions;
          o          commodity procurement; and
          o          telecommunications services.


                                      S-20

<PAGE>



           In February 2000, we acquired three additional companies that provide
energy-related services within these lines of business. Further, in August 2000,
we  acquired  another  company  that  builds,  installs  and  services  heating,
ventilation  and  air-conditioning  equipment  throughout New Jersey and eastern
Pennsylvania,  with customers ranging from small industrial  facilities to large
pharmaceutical  plants.  This company has 400 employees and reported revenues of
$93 million in 1999. In addition, we are also involved, through a joint venture,
in  providing  energy-related  services to consumers  through the  MyHomeKey.com
website. MyHomeKey is a personalized, internet-based home management system that
puts service  providers at customers'  fingertips,  delivers advice and one-stop
shopping for most home  products  and  services.  MyHomeKey.com  was launched in
September 2000.

           Selected  financial data for the energy services segment is set forth
in the following table for the periods indicated.


                                                       NINE MONTHS ENDED
                                                         SEPTEMBER 30,
                                            ------------------------------------
                                                  1999                   2000
                                            ----------------      --------------
                                                         (in thousands)

 Unaffiliated revenues                      $      123,165        $      480,511
 Intersegment revenues                                   -                48,677
 Cost of goods sold                                100,706               408,985
                                            --------------        --------------
 Gross Profit Margin                                22,459               120,203
 Depreciation and amortization                       2,292                 7,252
 Other operating expenses                           24,658                60,993
                                            --------------        --------------
 Operating Income (Loss)                    $      (4,491)        $       51,958
                                            ==============        ==============

           The increase in results of operations of the energy services  segment
for the nine months  ended  September  30, 2000,  compared to the  corresponding
period in 1999,  reflects  primarily,  fuel-management  services provided to the
Ravenswood  facility.  For the nine  months  ended  September  30,  2000,  these
services  provided  this segment with  earnings of $25.7  million.  A subsidiary
within this  segment,  KeySpan  Energy  Supply,  LLC,  provides  the  Ravenswood
facility with energy procurement  advisory services and acts as an energy broker
for the sale of electricity and ancillary services. For these services,  KeySpan
Energy  Supply  receives a  management  fee and shares in the  operating  profit
generated by the Ravenswood  facility on the sale of  electricity  and ancillary
services.  There was no energy procurement and fuel-management advisory services
agreement between KeySpan Energy Supply and the Ravenswood facility in 1999.

           This segment also realized significantly greater gross profit margins
for the nine months  ended  September  30, 2000,  compared to the  corresponding
period last year,  for each of its other lines of  business.  These gross margin
enhancements   resulted  from  recent   acquisitions   of  companies   providing
energy-related  services and through customer additions related to energy sales.
These  benefits to gross profit  margins,  however,  were offset by increases in
general and  administrative  expenses.  This  segment is expected to continue to
realize  earnings  from its  energy  procurement  and  fuel-management  advisory
services for the remainder of 2000 and the other business lines are projected to
be profitable in 2000.

ENERGY INVESTMENTS

           Earnings  for  this  segment  are  derived,  primarily,  from our 20%
interest in the  Iroquois Gas  Transmission  System LP; our 50% interest in Gulf
Midstream Services in Canada;  and our 50% interest in the Premier  Transmission
Pipeline and a 24.5% interest in Phoenix Natural Gas, both in Northern Ireland.

           Earnings  for this segment for the nine months  ended  September  30,
2000 increased by $2.0 million over the comparable  period last year  reflecting
earnings  growth  from our  Canadian  investments.  Results of  operations  from
Canadian gas and oil operations were enhanced  through the  acquisition,  in the
fourth  quarter  of 1999,  of the  Paddle  River  Gas  Plant  and oil  producing
properties in Alberta,  Canada, and more efficient operations of Gulf Midstream.
In addition,  Iroquois  realized  higher  transportation  sales  quantities  and
revenues from its interruptible

                                      S-21

<PAGE>



customers  during this period  compared  with the same period in 1999.  Earnings
from our  investments in Northern  Ireland in 2000 are  essentially  the same as
their earnings for the  corresponding  period in 1999. The  subsidiaries in this
segment are primarily  accounted for under the equity method since our ownership
interests  are 50% or  less.  Accordingly,  income  from  these  investments  is
reflected,  primarily  in other  income  and  (deductions)  in the  consolidated
statement of income.

           In  October  2000,  we sold our  interest  in certain  oil  producing
properties in Alberta,  Canada. An after tax gain of approximately  $1.3 million
from the sale will be reported in the fourth quarter of 2000.  Additionally,  in
October 2000, we acquired the remaining 50% interest in Gulf Midstream making us
the sole  owner of Gulf  Midstream.  The  transaction  required  us to borrow an
additional $48 million from a Canadian bank. For financial  reporting  purposes,
the operations of Gulf Midstream will now be fully  consolidated  with our other
operations.

OTHER

           The  other  segment  incurred  a loss of $43.0  million  for the nine
months ended September 30, 2000 compared to a loss of $16.3 million for the nine
months ended September 30, 1999. Results for the other segment generally reflect
preferred   stock   dividends   and  charges   incurred  by  our  corporate  and
administrative  areas  that  have not been  allocated  to the  various  business
segments and preferred  stock  dividends,  offset,  in part, by interest  income
earned on  temporary  cash  investments.  Interest  income has  decreased  as we
utilized cash to finance acquisitions,  invest in joint ventures, and repurchase
shares of our common stock. Additionally, during the nine months ended September
30,  2000,  we incurred an expense of $5.0  million  for a  contribution  to the
KeySpan  Foundation.  During this same time period,  we recorded charges of $9.0
million  associated with outstanding  regulatory  issues,  compared to a similar
charge of $6.0 million in the nine months ended September 30, 1999. Moreover, we
recorded a charge of $5.6 million in the nine months ended September 30, 2000 to
write-off a computer system that will not be utilized as a result of the Eastern
acquisition.


LIQUIDITY, CAPITAL EXPENDITURES AND FINANCING

           LIQUIDITY

           Cash flow provided by operating  activities for the nine months ended
September 30, 2000, reflects stable growth from our gas distribution operations,
as well as positive  contributions  from the Ravenswood  facility.  Further,  in
September 2000, we received a cash payment of  approximately  $48.0 million from
the Long Island Power Authority  representing amounts due for services performed
by us under the various  service  agreements.  These  benefits to cash flow from
operations  were offset,  in part,  by a decrease in interest  income;  negative
operating cash flow from our energy services segment; an increase in the cost of
gas in storage,  which will be recovered from  customers in later  periods;  and
increased interest expense associated with increased levels of debt outstanding.
Additionally,   cash  flow  from  operations  in  1999  also  reflect  the  cash
utilization  of a $57.4 million  federal income tax net operating loss on income
tax payments for 1999, as previously discussed.

           At September 30, 2000, we had cash and temporary cash  investments of
$63.6 million.  In addition,  we had a $700 million  revolving credit agreement,
with a  one-year  term and  one-year  renewal  option,  with a  commercial  bank
syndicate.  This credit facility is used to support our $700 million  commercial
paper program.  During the nine months ended  September 30, 2000, we issued $1.6
billion of commercial  paper and repaid $1.4 billion,  including the outstanding
balance at December 31, 1999. Commercial paper was issued during the nine months
ended  September  30,  2000 to support  ongoing  working  capital  needs and the
mandatory  redemption of our  preferred  stock 7.95% Series AA. At September 30,
2000,  $382.1  million of commercial  paper  remained  outstanding at a weighted
average  annualized  interest  rate of  6.73%.  We had  available  borrowing  of
commercial paper of $317.9 million at September 30, 2000.

           Houston  Exploration has an unsecured available line of credit with a
commercial bank that provides for a maximum commitment of $250 million,  subject
to certain conditions.  At September 30, 2000, $174.0 million was outstanding at
a weighted  average  annualized  interest rate of 7.84%.  At September 30, 2000,
Houston Exploration had available borrowings of $35.6 million.


                                      S-22

<PAGE>



           Also, a  subsidiary  included in the energy  investments  segment has
revolving credit  facilities with financial  institutions in Canada.  During the
nine  months  ended  September  30,  2000,  borrowings  were $33.6  million at a
weighted average annualized interest rate of 6.48%. Since September 30, 2000, an
additional  $48.0  million  was  borrowed  to  finance  the  acquisition  of the
remaining  50% interest in Gulf  Midstream.  This  subsidiary  has $50.1 million
available for borrowing under these facilities.

           We  satisfy  our  seasonal  working  capital  requirements  primarily
through  internally  generated  funds  and the  issuance  of  commercial  paper.
Additionally,  beginning in the third  quarter of 2000,  we issued shares of our
common stock out of treasury to satisfy the  requirements of our employee common
stock  plans.  We believe that our sources of funds are  sufficient  to meet our
seasonal working capital needs.

           CAPITAL EXPENDITURES

           The  table   below  sets   forth   KeySpan's   capital   construction
expenditures by segment for the periods indicated:


                                                     NINE MONTHS ENDED
                                                       SEPTEMBER 30,
                                           -------------------------------------
                                                       1999               2000
                                           ----------------     ----------------
                                                       (in thousands)

Gas Distribution                           $       136,803      $        160,561
Electric Services                                  229,795                42,421
Gas Exploration and Production                     112,006               163,443
Energy Services                                      3,323                10,799
Energy Investments and Other                        31,064                26,387
                                           ---------------      ----------------
                                           $       512,991      $        403,611
                                           ===============      ================

           The  capital  construction  expenditures  reflect,  primarily,  costs
associated with the gas distribution  segment for the renewal and replacement of
mains and services and for the expansion of the gas distribution  system on Long
Island. Electric service's construction  expenditures reflect primarily costs to
maintain  our  electric  generating   facilities  and,  for  1999,  reflect  the
acquisition of the Ravenswood facility. Construction expenditures related to gas
exploration and production reflect, in part, costs related to the development of
properties  acquired in Southern Louisiana and in the Gulf of Mexico in 1999 and
costs  related  to the  continued  development  of other  properties  previously
acquired.  Expenditures also include our joint venture with Houston  Exploration
to explore for natural gas and oil. Energy  investments  and other  construction
expenditures reflect, primarily costs related to Canadian affiliates.

           EQUITY INVESTMENTS

           During the nine months ended  September 30, 2000, the energy services
segment  acquired four  additional  companies  located in the New York tri-state
metropolitan area and Pennsylvania.  The newly acquired companies  specialize in
engineering-consulting,   plumbing  and  mechanical  contracting,  and  heating,
ventilation and air  conditioning  contracting.  Combined,  these companies have
over 1,300 employees and annual revenues of approximately $260 million.

           In addition, in March 2000, we and TXU Energy Services formed a joint
venture with  MyHomeKey.com,  Inc. We and TXU Energy Services have each invested
$12.5 million in the project;  Bechtel Enterprises has also invested $5 million.
TXU Energy Services is a unit of TXU, an investor-owned  energy service company,
and Bechtel  Enterprises is an affiliate of Bechtel.  The MyHomeKey.com  website
was launched in September 2000.


                                      S-23

<PAGE>



           FINANCING

           In June 2000, we redeemed,  at maturity,  our  preferred  stock 7.95%
Series AA through the utilization of internally generated funds and the proceeds
from the issuance of commercial paper. Our obligation of $370.2 million included
the  mandatory  redemption  price of $25 per share  totaling  $363 million and a
dividend of $7.2 million.

           On February 1, 2000,  KeySpan Energy Delivery Long Island issued $400
million  7.875% notes due February 1, 2010.  The net proceeds from this issuance
were used to reimburse our treasury for costs in  extinguishing  $397 million of
promissory  notes to Long Island Power  Authority that matured in June 1999. The
notes issued are fully and  unconditionally  guaranteed  by us. At September 30,
2000,  KeySpan Energy Delivery Long Island had $200 million of medium term notes
available for issuance under the shelf registration statement.

           We have accessed the financial  markets and raised  approximately  $2
billion of Bridge  Financing  and other  commercial  paper for the  Eastern  and
EnergyNorth  transactions.  We plan to  replace  the Bridge  Financing  with the
proceeds of the Notes.

           In  connection  with the Eastern  and  EnergyNorth  transactions,  we
entered into forward  starting swap agreements to hedge a portion of the risk of
interest rate changes  associated with the issuance of the Notes. The agreements
had a total  notional  principal  amount  of  $1.5  billion.  See  note 4 to the
consolidated  financial  statements,  "Liquidity and  Financings" for additional
details.

           In  addition  to our  financing  arrangements  for  the  Eastern  and
EnergyNorth transactions, it is currently our intention to issue preferred stock
during 2001. We have also increased our current commercial paper program to $1.4
billion.  We  anticipate  that  we  may  issue  approximately  $800  million  in
commercial  paper in the last  quarter  of 2000 to  refinance  a portion  of the
Eastern  acquisition  and meet the combined  seasonal  working  capital needs of
KeySpan, Eastern and EnergyNorth.  We believe that our sources of funding (i.e.,
the Notes, preferred stock issuances and commercial paper) will be sufficient to
meet our anticipated cash needs.

GAS DISTRIBUTION - RATE MATTERS

           By orders  dated  February  5,  1998 and April 14,  1998 the New York
Public Service  Commission  approved a stipulation  and agreement  among KeySpan
Energy  Delivery New York, Long Island  Lighting  Company,  the staff of the New
York Public Service Commission and six other parties that in effect approved the
merger of KeySpan  Energy  Corporation  and Long  Island  Lighting  Company  and
established gas rates for our two New York gas  distribution  subsidiaries  that
are  currently in effect.  On November 30, 2000,  KeySpan  Energy  Delivery Long
Island's  rate  agreement  with the New York  State  Public  Service  Commission
expires.  Under the terms of the  agreement,  current  gas rates will  remain in
effect through 2001,  unless either  KeySpan Energy  Delivery Long Island or the
staff of the New York State Public Service Commission  requests a hearing. We do
not intend to initiate such a proceeding  and at this time, we have no reason to
believe  that the staff of the New York State  Public  Service  Commission  will
initiate  such a rate  proceeding  either.  Therefore,  we  expect  current  gas
distribution rates for our two New York gas distribution  utilities to remain in
effect through 2001.  For more  information  on these  agreements,  refer to our
annual report on Form 10-K for the year ended December 31, 1999.

ENVIRONMENTAL MATTERS

           We  are  subject  to  various  federal,  state  and  local  laws  and
regulatory programs related to the environment. Ongoing environmental compliance
activities,  which  have  not  been  material,  are  charged  to  operation  and
maintenance  activities.  We estimate  that the  remaining  minimum  cost of our
manufactured gas plant-related environmental cleanup activities, including costs
of $5.0 million associated with the Ravenswood  facility,  will be approximately
$119 million and have recorded a related liability for such amount.  Further, as
of September 30, 2000, we had expended a total of approximately $20 million. See
note 3 to the consolidated financial statements "Environmental Matters."


                                      S-24

<PAGE>

                              DESCRIPTION OF NOTES

           This  description of the terms of the 7.25% Notes due 2005 (the "2005
Notes"),  the 7.625%  Notes due 2010 (the "2010  Notes") and the 8.00% Notes due
2030 (the "2030 Notes" and, together with the 2005 Notes and the 2010 Notes, the
"Notes")  supplements the description of the general terms and provisions of the
securities in the  accompanying  prospectus.  If this summary differs in any way
from that  description in the accompanying  prospectus,  you should rely on this
summary.  The 2005 Notes,  the 2010 Notes and the 2030 Notes will each be issued
as a separate series of debt securities which we have registered for issuance on
terms to be  determined  at the time of their  sale.  Whenever  we refer in this
Description  of Notes to terms  defined  in the  indenture,  we intend  that the
defined terms be incorporated in this description by reference.

GENERAL

           The Notes will be issued under an indenture,  dated as of November 1,
2000, between us and The Chase Manhattan Bank, as trustee.

           The Notes  initially  will be  limited  to  $1,650,000,000  principal
amount,  consisting of $700,000,000 principal amount of 2005 Notes, $700,000,000
principal amount of 2010 Notes, and $250,000,000 principal amount of 2030 Notes.
The 2005 Notes will mature on November 15,  2005,  the 2010 Notes will mature on
November  15, 2010,  and the 2030 Notes will mature on November  15,  2030.  The
Notes  will  be  redeemable  at any  time  at  their  principal  amount  plus an
applicable premium and accrued interest, as described under Optional Redemption.

           Notes  will be  issued in  minimum  denominations  of  $1,000  and in
integral multiples of $1,000 thereof.

           The Notes will be our unsecured obligations.  Each of the 2005 Notes,
the 2010 Notes and the 2030 Notes  will rank  senior to our future  debt that is
subordinated  to that series of Notes,  and will rank equally with our debt that
is not subordinated to that series of Notes.

     Any  money  we pay to a paying  agent  for the  payment  of  principal  of,
premium,  or interest on the Notes which  remains  unclaimed for two years after
the date the  payment  was due will be  returned to us. Upon the return of those
moneys to us,  holders of the Notes,  with respect to moneys so  returned,  will
look to us for payment as our unsecured  general  creditors and any liability of
the paying agent with respect to those moneys will cease.

INTEREST ON THE NOTES

           The 2005 Notes,  the 2010 Notes and the 2030 Notes will bear interest
at the  applicable  annual  rate  noted  on the  cover  page of this  prospectus
supplement.  Interest  will be payable in arrears on May 15 and  November  15 of
each year, beginning May 15, 2001. Interest on the Notes will be paid to holders
of record on the May 1 and  November 1 preceding  the related  interest  payment
date.

           Interest  payments in respect of the 2005  Notes,  the 2010 Notes and
the 2030 Notes will equal the amount of interest  accrued from and including the
immediately  preceding  interest  payment date in respect of which  interest has
been paid or duly made  available for payment (or from and including the date of
issue,  if no interest  has been paid or duly made  available  for payment  with
respect  to the  applicable  Notes) to but  excluding  the  applicable  interest
payment date or maturity date, as the case may be. Interest on the Notes will be
computed on the basis of a 360-day year of twelve 30-day months.

           If any interest  payment date or maturity date falls on a day that is
not a business day, the required  payment of principal  and/or  interest will be
made on the next  business  day as if made on the date that payment was due, and
no  interest  will  accrue on that  payment  for the  period  from and after the
interest  payment date or maturity  date, as the case may be, to the date of the
payment  on the  next  business  day.  As used in  this  prospectus  supplement,
"business day" means any day, other than a Saturday or Sunday, that is neither a
legal holiday nor a day on which  commercial banks are authorized or required by
law, regulation or executive order to close in The City of New York.

                                      S-25

<PAGE>

OPTIONAL REDEMPTION

           The 2005 Notes,  the 2010 Notes and the 2030 Notes will be redeemable
at any time, at our option, in whole, on not less than 30 nor more than 60 days'
prior notice,  prior to their maturity at a redemption price equal to the sum of
the principal  amount of the Notes,  the Make-Whole  Amount described below with
respect  to such  series and any  accrued  and  unpaid  interest  to the date of
redemption.  Holders  of  record  on a  record  date  that is on or  prior  to a
redemption date will be entitled to receive interest due on the interest payment
date.

           The term "Make-Whole Amount" means, the excess, if any, of:


     o    the  aggregate  present  value  as of the  date of the  redemption  of
          principal  being  redeemed  and the amount of interest  (exclusive  of
          interest  accrued  to the date of  redemption)  that  would  have been
          payable if redemption had not been made, determined by discounting, on
          a  semiannual  basis,  the  remaining  principal  and  interest at the
          Reinvestment  Rate described  below  (determined on the third business
          day  preceding  the date notice of redemption is given) from the dates
          on which the  principal  and  interest  would have been payable if the
          redemption had not been made, to the date of redemption, over

     o    the aggregate principal amount of the Notes being redeemed.


           The term  "Reinvestment  Rate"  means 25  basis  points  for the 2005
Notes, 30 basis points for the 2010 Notes and 35 basis points for the 2030 Notes
plus,  in each case,  the  arithmetic  mean of the yield under the heading "Week
Ending"  published  in the most  recent  Statistical  Release  under the caption
"Treasury  Constant  Maturities" for the maturity (rounded to the nearest month)
corresponding  to the remaining life to maturity,  as of the payment date of the
principal  being  redeemed or paid. If no maturity  exactly  corresponds  to the
maturity,  yields for the two published maturities most closely corresponding to
the  maturity  would  be so  calculated  and  the  Reinvestment  Rate  would  be
interpolated or extrapolated on a straight-line  basis,  rounding to the nearest
month.  The  most  recent  Statistical  Release  published  prior to the date of
determination of the Make-Whole  Amount will be used for purposes of calculating
the Reinvestment Rate.

           The Make-Whole Amount will be calculated by an independent investment
banking institution of national standing appointed by us. If we fail to make the
appointment at least 45 business days prior to the date of redemption, or if the
institution is unwilling or unable to make the calculation, the calculation will
be made by an independent  investment  banking  institution of national standing
appointed by the trustee. If the Reinvestment Rate is not available as described
above,   the   Reinvestment   Rate  will  be  calculated  by   interpolation  or
extrapolation of comparable rates selected by the independent investment banking
institution.

FURTHER ISSUES

           We may from time to time  without  notice to, or the  consent of, the
holders of a series of Notes,  create and issue further Notes of the same series
as any of the series of Notes offered hereby, equal in rank to such Notes in all
respects (or in all respects  except for the payment of interest  accruing prior
to the issue  date of the new  securities  or except  for the first  payment  of
interest  following  the  issue  date of the  new  securities)  so that  the new
securities may be consolidated and form a single series with the relevant series
of Notes and have the same terms as to status,  redemption  or  otherwise as the
relevant series of Notes.

BOOK ENTRY, DELIVERY AND FORM

           Each  series of Notes will be issued in one or more fully  registered
global  securities which will be deposited with, or on behalf of, The Depository
Trust Company,  New York, New York (the "Depository") and registered in the name
of Cede & Co., the Depository's nominee. We will not issue Notes in certificated
form.  Beneficial interests in the global securities will be represented through
book-entry  accounts of financial  institutions  acting on behalf of  beneficial
owners as direct and indirect  participants in the Depository  (the  "Depository
Participants").  Investors may elect to hold interests in the global  securities
through either the Depository (in the United  States),  or Clearstream  Banking,
societe  anonyme  ("Clearstream")  or Morgan Guaranty Trust Company of New York,
Brussels

                                      S-26
<PAGE>

Office,  as operator of the Euroclear System  ("Euroclear") (in Europe)
if they are participants of those systems, or, indirectly, through organizations
that are participants in those systems.

           Clearstream  and  Euroclear  will hold  interests  on behalf of their
participants  through  customers'   securities  accounts  in  Clearstream's  and
Euroclear's names on the books of their respective  depositories,  which in turn
will hold those interests in customers' securities accounts in the depositories'
names on the books of the Depository.  At the present time, Citibank,  N.A. acts
as U.S.  depositary for  Clearstream  and The Chase  Manhattan Bank acts as U.S.
depositary for Euroclear (the "U.S. Depositories").  Beneficial interests in the
global securities will be held in denominations of $1,000 and integral multiples
thereof. Except as set forth below or in the accompanying prospectus, the global
securities may be transferred, in whole but not in part, only to another nominee
of the Depository or to a successor of the Depository or its nominee.

           Clearstream has advised us that it is incorporated  under the laws of
Luxembourg as a professional  depositary.  Clearstream  holds securities for its
participating  organizations  ("Clearstream  Participants")  and facilitates the
clearance  and  settlement  of  securities   transactions   between  Clearstream
Participants  through  electronic  book-entry changes in accounts of Clearstream
Participants,   thereby   eliminating   the  need  for   physical   movement  of
certificates.  Clearstream  provides to  Clearstream  Participants,  among other
things,  services for safekeeping,  administration,  clearance and settlement of
internationally   traded  securities  and  securities   lending  and  borrowing.
Clearstream  interfaces  with  domestic  markets  in  several  countries.  As  a
professional depositary,  Clearstream is subject to regulation by the Luxembourg
Monetary   Institute.   Clearstream   Participants   are  recognized   financial
institutions around the world,  including  underwriters,  securities brokers and
dealers,  banks,  trust  companies,  clearing  corporations  and  certain  other
organizations  and may include the  underwriters or their  affiliates.  Indirect
access to  Clearstream  is also  available  to others,  such as banks,  brokers,
dealers  and trust  companies  that  clear  through,  or  maintain  a  custodial
relationship with, a Clearstream Participant either directly or indirectly.

           Distributions  with respect to each series of Notes held beneficially
through   Clearstream   will  be  credited  to  cash  accounts  of   Clearstream
Participants in accordance with its rules and procedures, to the extent received
by the U.S. Depositary for Clearstream.

           Euroclear  has  advised  us  that  it was  created  in  1968  to hold
securities for participants of Euroclear ("Euroclear Participants") and to clear
and settle  transactions  between Euroclear  Participants  through  simultaneous
electronic book-entry delivery against payment, thereby eliminating the need for
physical  movement  of  certificates  and any  risk  from  lack of  simultaneous
transfers of securities and cash.  Euroclear  includes  various other  services,
including  securities lending and borrowing and interfaces with domestic markets
in several countries.  Euroclear is operated by the Brussels,  Belgium office of
Morgan  Guaranty  Trust Company of New York (the  "Euroclear  Operator"),  under
contract  with  Euroclear   Clearance   Systems  S.C.,  a  Belgian   cooperative
corporation (the  "Cooperative").  All operations are conducted by the Euroclear
Operator,  and all Euroclear  securities  clearance  accounts and Euroclear cash
accounts are accounts  with the Euroclear  Operator,  not the  Cooperative.  The
Cooperative   establishes   policy  for   Euroclear   on  behalf  of   Euroclear
Participants.  Euroclear  Participants  include banks (including central banks),
securities brokers and dealers and other professional  financial  intermediaries
and may  include  the  underwriters  or their  affiliates.  Indirect  access  to
Euroclear  is also  available  to other  firms that clear  through or maintain a
custodial  relationship  with  a  Euroclear  Participant,   either  directly  or
indirectly.

           The  Euroclear  Operator is the Belgian  branch of a New York banking
corporation,  which is a member bank of the Federal Reserve System. As a result,
it is regulated  and  examined by the Board of Governors of the Federal  Reserve
System,   the  New  York  State  Banking  Department  and  the  Belgian  Banking
Commission.

           Securities  clearance  accounts and cash  accounts with the Euroclear
Operator are governed by the Terms and Conditions Governing Use of Euroclear and
the related Operating Procedures of the Euroclear System, and applicable Belgian
law (the "Terms and  Conditions").  The Terms and Conditions govern transfers of
securities  and cash within  Euroclear,  withdrawals of securities and cash from
Euroclear, and receipts of payments with respect to securities in Euroclear. All
securities in Euroclear  are held on a fungible  basis  without  attribution  of
specific  certificates to specific securities clearance accounts.  The Euroclear
Operator  acts  under  the  Terms and  Conditions  only on  behalf of  Euroclear
Participants,  and has no  record  of, or  relationship  with,  persons  holding
through Euroclear Participants.

                                      S-27
<PAGE>

           Distributions  with respect to each series of Notes held beneficially
through   Euroclear   will  be  credited  to  the  cash  accounts  of  Euroclear
Participants in accordance with the Terms and Conditions, to the extent received
by the U.S. Depositary for Euroclear.

GLOBAL CLEARANCE AND SETTLEMENT PROCEDURES

           Initial  settlement  for  each  series  of  Notes  will  be  made  in
immediately  available  funds.   Secondary  market  trading  between  Depository
Participants  will occur in the ordinary way in accordance with the Depository's
rules and will be settled in immediately  available funds using the Depository's
Same-Day Funds Settlement System.  Secondary market trading between  Clearstream
Participants  and  Euroclear  Participants  will  occur in the  ordinary  way in
accordance with the applicable rules and operating procedures of Clearstream and
Euroclear and will be settled using the  procedures  applicable to  conventional
eurobonds in immediately available funds.

           Cross-market transfers between persons holding directly or indirectly
through the  Depository  on the one hand,  and  directly or  indirectly  through
Clearstream or Euroclear Participants, on the other, will be effected within the
Depository in accordance with the  Depository's  rules on behalf of the relevant
European  international  clearing  system  by  its  U.S.  Depository;   however,
cross-market  transactions will require delivery of instructions to the relevant
European  international  clearing  system by the  counterparty in that system in
accordance  with its rules and procedures and within its  established  deadlines
(European time). The relevant  European  international  clearing system will, if
the transaction meets its settlement  requirements,  deliver instructions to its
U.S.  Depositary  to take  action to effect  final  settlement  on its behalf by
delivering or receiving Notes in the Depository, and making or receiving payment
in accordance with normal procedures for same-day funds settlement applicable to
the Depository.  Clearstream  Participants  and Euroclear  Participants  may not
deliver instructions directly to their respective U.S. Depositories.

           Because  of  time-zone  differences,  credits  of Notes  received  in
Clearstream  or  Euroclear  as a  result  of a  transaction  with  a  Depository
Participant will be made during subsequent  securities settlement processing and
dated the business day following the Depository  settlement date. Those credits,
or any transactions in the Notes settled during processing,  will be reported to
the relevant Euroclear Participants or Clearstream Participants on that business
day. Cash received in  Clearstream or Euroclear as a result of sales of Notes by
or through a Clearstream  Participant or a Euroclear Participant to a Depository
Participant will be received with value on the business day of settlement in the
Depository  but will be available in the relevant  Clearstream or Euroclear cash
account only as of the business day following settlement in the Depository.

           In the event that the Notes are no longer held through the book-entry
facilities of the  Depository or a successor to the  Depository,  we, so long as
Notes are listed on the  Luxembourg  Stock  Exchange,  will maintain an agent in
Luxembourg for making payments on, and transfers of, Notes.

           Although the Depository, Clearstream and Euroclear have agreed to the
foregoing  procedures  in order to  facilitate  transfers  of  securities  among
participants  of the Depository,  Clearstream  and Euroclear,  they are under no
obligation  to perform or  continue  to perform  those  procedures  and they may
discontinue the procedures at any time.

                                        S-28


<PAGE>

                                  UNDERWRITING

           Subject  to the terms and  conditions  set forth in the  underwriting
agreement  dated  the  date  hereof,  we  have  agreed  to  sell  to each of the
underwriters named below, severally,  and each of the underwriters has severally
agreed to purchase,  the  principal  amount of the Notes set forth  opposite its
name:

<TABLE>
<CAPTION>
                                                                      PRINCIPAL AMOUNT OF
UNDERWRITER                                           2005 NOTES           2010 NOTES            2030 NOTES
-----------                                          -----------           ----------            ----------
<S>                                               <C>                   <C>                   <C>
J.P. Morgan Securities Inc.....                    $381,500,000          $381,500,000          $136,250,000
Chase Securities Inc...........                     112,000,000           112,000,000            40,000,000
Salomon Smith Barney Inc.......                      84,000,000            84,000,000            30,000,000
ABN AMRO Incorporated..........                      10,500,000            10,500,000             3,750,000
Banc of America Securities LLC.                      10,500,000            10,500,000             3,750,000
Banc One Capital Markets, Inc..                      10,500,000            10,500,000             3,750,000
BNY Capital Markets, Inc.......                      10,500,000            10,500,000             3,750,000
Barclays Capital Inc...........                      10,500,000            10,500,000             3,750,000
Credit Lyonnais Securities (USA) Inc......           10,500,000            10,500,000             3,750,000
FleetBoston Robertson Stephens Inc........           10,500,000            10,500,000             3,750,000
PNC Capital Markets, Inc.......                      10,500,000            10,500,000             3,750,000
RBC Dominion Securities Corporation.......           10,500,000            10,500,000             3,750,000
The Royal Bank of Scotland plc.                      10,500,000            10,500,000             3,750,000
Scotia Capital (USA) Inc.......                      10,500,000            10,500,000             3,750,000
Utendahl Capital Partners, L.P............            3,500,000             3,500,000             1,250,000
The Williams Capital Group, L.P...........            3,500,000             3,500,000             1,250,000
                                                   ------------          ------------          ------------
           Total                                   $700,000,000          $700,000,000          $250,000,000
                                                   ============          ============          ============
</TABLE>
Under  the  terms  and  conditions  of  the  underwriting   agreement,   if  the
underwriters  take any of the Notes, then the underwriters are obligated to take
and pay for all of the Notes.

The Notes are a new issue of securities  with no established  trading market and
will not be listed on any national  securities  exchange.  The underwriters have
advised us that they  intend to make a market  for the  Notes,  but they have no
obligation  to do so and may  discontinue  market  making  at any  time  without
providing  any notice.  No  assurance  can be given as to the  liquidity  of any
trading market for the Notes. Expenses associated with this offering, to be paid
by us, are estimated to be $1 million.

The  underwriters  initially  propose to offer part of the Notes directly to the
public at the  offering  prices  described on the cover page and part to certain
dealers at a price that  represents  a  concession  not in excess of .35% of the
principal  amount of the 2005 Notes,  .40% of the  principal  amount of the 2010
Notes and .50% of the principal  amount of the 2030 Notes.  Any  underwriter may
allow, and any such dealer may re-allow, a concession not in excess of .225%, in
the case of the 2005 Notes, and .25%, in the case of the 2010 and 2030 Notes, of
the principal  amount of the Notes to certain other  dealers.  After the initial
offering of the Notes,  the underwriters may from time to time vary the offering
price and other selling terms.

           JP  Morgan  Securities  Inc.  will  make  securities   available  for
distribution on the internet through a proprietary web site and/or a third_party
system  operated  by  Market  Axess  Inc.,  an   internet_based   communications
technology  provider.  Market  Axess is  providing  the system as a conduit  for
communications  between JP Morgan Securities Inc. and their customers and is not
a party to this  offering.  We do not believe that Market Axess will function as
an underwriter  or agent of this  offering,  nor do we believe that Market Axess
will act as a broker for any

                                        S-29
<PAGE>

customer of JP Morgan Securities Inc. Market Axess is a registered broker_dealer
and  will  receive   compensation  from  JP  Morgan  Securities  Inc.  based  on
transactions  conducted  through the system. JP Morgan Securities Inc. will make
the notes  available  to their  customers  through the  internet  distributions,
whether made through a proprietary or third_party  channel, on the same terms as
distributions made through other channels.

           We  have  agreed  to  indemnify  the  underwriters   against  certain
liabilities, including liabilities under the Securities Act of 1933, as amended,
or to contribute to payments which the  underwriters  may be required to make in
respect of any such liabilities.

           In connection with the offering of the Notes,  the  underwriters  may
engage in transactions that stabilize, maintain or otherwise affect the price of
the Notes. Specifically,  the underwriters may over-allot in connection with the
offering of the Notes,  creating a syndicate  short position.  In addition,  the
underwriters  may bid for,  and  purchase,  Notes in the  open  market  to cover
syndicate short positions or to stabilize the price of the Notes.  Finally,  the
underwriting  syndicate may reclaim selling concessions allowed for distributing
the Notes in the offering of the Notes, if the syndicate repurchases  previously
distributed Notes in syndicate covering transactions, stabilization transactions
or otherwise. Any of these activities may stabilize or maintain the market price
of the Notes above independent  market levels. The underwriters are not required
to engage in any of these activities, and may end any of them at any time.

           In  the  ordinary  course  of  their   respective   businesses,   the
underwriters and their affiliates have engaged, and may in the future engage, in
commercial  banking  and/or  investment  banking  transactions  with  us and our
affiliates. Affiliates of a majority of the underwriters are participants in the
bank credit facility that backs the Bridge Financing and in our revolving credit
agreement. Because more than 10% of the net proceeds of the offering may be paid
to affiliates of National Association of Securities Dealers,  Inc. members which
are  participating  in the distribution of the Notes, the offering is being made
in  compliance  with Conduct Rule  2710(c)(8)  of the  National  Association  of
Securities Dealers, Inc.

                                        S-30


<PAGE>



<TABLE>
<CAPTION>
                          INDEX TO FINANCIAL STATEMENTS


                                                                                                                        PAGE
                                                                                                                        ----
          <S>                                                                                                          <C>
           KeySpan's  Consolidated  Balance  Sheet at December 31, 1999 and                                             FS-2
           September 30, 2000

           KeySpan's Consolidated Statements of Income for the nine month periods                                       FS-4
           ended September 30, 1999 and 2000

           KeySpan's Consolidated Statement of Cash Flows for the nine month periods                                    FS-5
           ended September 30, 1999 and 2000

           KeySpan's Notes to Consolidated Financial Statements for the nine month                                      FS-6
           period ended September 30, 2000

           Eastern's Consolidated Balance Sheet at September 30, 1999, December 31,                                     FS-12
           1999 and September 30, 2000

           Eastern's Consolidated Statements of Income for the nine month periods ended                                 FS-13
           September 30, 1999 and 2000

           Eastern's Consolidated Statement of Cash Flows for the nine month periods                                    FS-14
           ended September 30, 1999 and 2000

           Eastern's Notes to Consolidated Financial Statements for the nine month period                               FS-15
           ended September 30, 2000
</TABLE>



                                      FS-1

<PAGE>


<TABLE>
                                               KEYSPAN'S CONSOLIDATED BALANCE SHEET

<CAPTION>
                                                              DECEMBER 31,            SEPTEMBER 30,
                                                                  1999                    2000
                                                           -------------------    ---------------------
                                                                          (in thousands)
<S>                                                               <C>                       <C>
ASSETS

CURRENT ASSETS
     Cash and temporary cash investments                   $           128,602    $              63,618
     Customer accounts receivable                                      425,643                  609,890
     Other accounts receivable                                         235,156                  222,478
     Allowance for uncollectible accounts                              (20,294)                 (26,281)
     Special deposits                                                   60,863                   42,485
     Gas in storage, at average cost                                   144,256                  260,738
     Materials and supplies, at average cost                            84,813                   95,004
     Other                                                              98,914                   88,629
                                                           -------------------    ---------------------
                                                                     1,157,953                1,356,561
                                                           -------------------    ---------------------


EQUITY INVESTMENTS AND OTHER                                           391,731                  427,557
                                                           -------------------    ---------------------

PROPERTY
     Electric                                                        1,346,851                1,386,206
     Gas                                                             3,449,384                3,584,690
     Other                                                             375,657                  393,252
     Accumulated depreciation                                       (1,589,287)              (1,688,283)
     Gas exploration and production, at cost                         1,177,916                1,346,357
     Accumulated depletion                                            (520,509)                (582,912)
                                                           -------------------    ---------------------
                                                                     4,240,012                4,439,310
                                                           -------------------    ---------------------

DEFERRED CHARGES
     Regulatory assets                                                 319,167                  320,931
     Goodwill, net of amortizations                                    255,778                  350,552
     Other                                                             366,050                  357,610
                                                           -------------------    ---------------------
                                                                       940,995                1,029,093
                                                           -------------------    ---------------------

TOTAL ASSETS                                               $         6,730,691    $           7,252,521
                                                           ===================    =====================
</TABLE>


        See accompanying Notes to the Consolidated Financial Statements.

                                      FS-2

<PAGE>


<TABLE>
<CAPTION>

                                                 KEYSPAN'S CONSOLIDATED BALANCE SHEET


                                                                                DECEMBER 31,              SEPTEMBER 30,
                                                                                    1999                       2000
                                                                           -----------------------   ------------------------
                                                                                             (in thousands)
<S>                                                                                   <C>                         <C>
LIABILITIES AND CAPITALIZATION

CURRENT LIABILITIES
     Current redemption of preferred stock                                 $               363,000     $                    -
     Accounts payable and accrued expenses                                                 645,347                    670,869
     Commercial paper                                                                      208,300                    382,090
     Dividends payable                                                                      61,306                     61,276
     Taxes accrued                                                                          50,437                     90,195
     Customer deposits                                                                      31,769                     30,552
     Interest accrued                                                                       28,093                     23,879
                                                                           -----------------------   ------------------------
                                                                                         1,388,252                  1,258,861
                                                                           -----------------------   ------------------------

DEFERRED CREDITS AND OTHER LIABILITIES
     Regulatory liabilities                                                                 26,618                     44,350
     Deferred income tax                                                                   186,230                    238,748
     Postretirement benefits and other reserves                                            501,603                    542,596
     Other                                                                                  66,200                     95,018
                                                                           -----------------------   ------------------------
                                                                                           780,651                    920,712
                                                                           -----------------------   ------------------------

CAPITALIZATION
    Common stock, $.01 par value, authorized
        450,000,000 shares; outstanding 133,866,077 and
        134,575,028 shares                                                               2,973,388                  2,987,242
    Retained earnings                                                                      456,882                    481,658
    Accumulated foreign currency adjustment                                                  7,714                     (6,476)
    Treasury stock purchased                                                              (722,959)                  (702,435)
                                                                           -----------------------   ------------------------
      Total common shareholders' equity                                                  2,715,025                  2,759,989
    Preferred stock                                                                         84,339                     84,323
    Long-term debt                                                                       1,682,702                  2,120,752
                                                                           ------------------------  ------------------------
Total capitalization                                                                     4,482,066                  4,965,064
                                                                           -----------------------   ------------------------

MINORITY INTEREST IN SUBSIDIARY COMPANIES                                                   79,722                    107,884
                                                                           -----------------------   ------------------------
TOTAL LIABILITIES AND CAPITALIZATION                                       $             6,730,691   $              7,252,521
                                                                           =======================   ========================
</TABLE>



        See accompanying Notes to the Consolidated Financial Statements.

                                      FS-3

<PAGE>


<TABLE>
                                              KEYSPAN'S CONSOLIDATED STATEMENT OF INCOME
<CAPTION>



                                                                                      NINE MONTHS ENDED
                                                                                        SEPTEMBER 30,
                                                                                1999                     2000
                                                                        --------------------      -------------------
                                                                                   (dollars in thousands)
<S>                                                                               <C>                     <C>
REVENUES
     Gas distribution                                                   $          1,208,254      $         1,458,595
     Electric services                                                               606,552                1,097,616
     Gas exploration and production                                                  103,622                  169,966
     Energy services and other                                                       124,675                  485,161
                                                                        --------------------      -------------------
     Total revenues                                                                2,043,103                3,211,338
                                                                        --------------------      -------------------
OPERATING EXPENSES
     Purchased gas for resale                                                        498,609                  717,140
     Purchased fuel                                                                        -                  334,135
     Operations and maintenance                                                      765,221                1,123,581
     Depreciation, depletion and amortization                                        180,698                  216,364
     Operating taxes                                                                 258,355                  298,010
                                                                        --------------------      -------------------
     Total operating expenses                                                      1,702,883                2,689,230
                                                                        --------------------      -------------------
     Operating income                                                                340,220                  522,108
                                                                        --------------------      -------------------

OTHER INCOME AND (DEDUCTIONS)
     Income from equity investments                                                    9,749                   16,333
     Minority interest                                                                (5,226)                 (13,747)
     Interest income and other                                                        27,679                    6,510
                                                                        --------------------      -------------------
     Total other income                                                               32,202                    9,096
                                                                        --------------------      -------------------
INCOME BEFORE INTEREST CHARGES AND INCOME TAXES                                      372,422                  531,204
                                                                        --------------------      -------------------
INTEREST CHARGES                                                                      98,824                  120,106
                                                                        --------------------      -------------------
INCOME TAXES
Current                                                                              (14,886)                 116,396
Deferred                                                                             113,258                   54,462
                                                                        --------------------      -------------------
     Total income taxes                                                               98,372                  170,858
                                                                        --------------------      -------------------
NET INCOME                                                                           175,226                  240,240
Preferred stock dividend requirements                                                 26,067                   16,453
                                                                        --------------------      -------------------
EARNINGS FOR COMMON STOCK                                               $            149,159      $           223,787
FOREIGN CURRENCY ADJUSTMENT                                                            3,454                  (14,190)
                                                                        --------------------      -------------------
COMPREHENSIVE INCOME                                                    $            152,613      $           209,597
                                                                        ====================      ===================
BASIC AND DILUTED EARNINGS PER COMMON SHARE                             $             1.06        $            1.67
AVERAGE COMMON SHARES OUTSTANDING                                                    140,079                  133,965
                                                                        ====================      ===================
</TABLE>
        See accompanying Notes to the Consolidated Financial Statements.

                                      FS-4

<PAGE>


<TABLE>
                                            KEYSPAN'S CONSOLIDATED STATEMENT OF CASH FLOWS
<CAPTION>


                                                                                        NINE MONTHS ENDED
                                                                                          SEPTEMBER 30,
                                                                                    1999                2000
                                                                               ---------------    ----------------
                                                                                         (in thousands)
<S>                                                                                  <C>                 <C>
Operating Activities
Net Income                                                                     $       175,226    $        240,240
Adjustments to reconcile net income to net cash provided by
(used in) operating activities
    Depreciation, depletion and amortization                                           180,698             216,364
    Deferred income tax                                                                113,258              54,462
    Income from equity investments                                                      (9,749)            (16,333)
    Dividends from equity investments                                                    6,375              19,568
Changes in assets and liabilities
    Accounts receivable                                                                155,538             (38,759)
    Materials and supplies, fuel oil and gas in storage                                (18,997)           (128,705)
    Accounts payable and accrued expenses                                             (143,858)             27,451
    Interest accrued                                                                   (11,050)            (12,269)
    Special deposits                                                                    55,050              18,378
    Prepayments and other                                                              (59,437)             86,803
                                                                               ---------------    ----------------
Net Cash Provided by Operating Activities                                              443,054             467,200
                                                                               ---------------    ----------------
Investing Activities
    Capital expenditures                                                              (512,991)           (403,611)
    Investments                                                                              -            (175,977)
    Other                                                                               10,749               7,599
                                                                               ---------------    ----------------
Net Cash (Used in) Investing Activities                                               (502,242)           (571,989)
                                                                               ---------------    ----------------
Financing Activities
    Treasury stock issued (purchased)                                                 (289,172)             20,951
    Issuance of commercial paper, net                                                  103,950             173,790
    Issuance of long-term debt                                                          40,523             463,627
    Payment of long-term debt                                                         (397,000)            (37,000)
    Payment of preferred stock                                                               -            (363,000)
    Preferred stock dividends paid                                                     (26,067)            (18,600)
    Common stock dividends paid                                                       (185,375)           (179,049)
    Other                                                                                 (548)            (20,914)
                                                                               ---------------    ----------------
Net Cash Provided by (Used in) Financing Activities                                   (753,689)             39,805
                                                                               ---------------    ----------------
Net (Decrease) in Cash and Temporary Cash Investments (1)                      $      (812,877)   $        (64,984)
                                                                               ===============    ================
Cash and temporary cash investments at beginning of period                     $       942,776    $        128,602
Net (Decrease) in cash and temporary cash investments                                 (812,877)            (64,984)
                                                                               ---------------    ----------------
Cash and Temporary Cash Investments at End of Period                           $       129,899    $         63,618
                                                                               ===============    ================
-----------------
</TABLE>
(1)   Temporary cash investments are short-term  marketable securities purchased
      with  maturities  of three  months or less that were carried at cost which
      approximates fair value.

        See accompanying Notes to the Consolidated Financial Statements.


                                      FS-5

<PAGE>



              KEYSPAN'S NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                     FOR THE PERIOD ENDED SEPTEMBER 30, 2000


           KeySpan  Corporation  (referred  to in the  notes  to  the  Financial
Statements as "we",  "us", and "our") is a holding company  currently  operating
two utilities that distribute natural gas to approximately 1.6 million customers
in  New  York  City  and  on  Long   Island,   making  it  the  fourth   largest
gas-distribution company in the United States. We are also a major, and growing,
generator of electricity. We own and operate five large generating plants and 42
smaller  facilities in Nassau and Suffolk  Counties on Long Island and lease and
operate a major  facility in Queens County in New York City.  Under  contractual
arrangements, we provide power, electric transmission-and-distribution services,
billing and other  customer  services  for  approximately  one million  electric
customers  of the Long  Island  Power  Authority.  Our  other  subsidiaries  are
involved in oil and gas exploration and production;  gas storage;  wholesale and
retail gas and electric marketing;  appliance service; heating,  ventilation and
air  conditioning  installation  and services;  large  energy-system  ownership,
installation and management;  telecommunications;  and  energy-related  internet
activities.  We also invest in, and participate in the development of, pipelines
and other energy-related projects, domestically and internationally.


1.         BASIS OF PRESENTATION

           In our opinion,  the accompanying  consolidated  financial statements
contain all adjustments necessary to present fairly our financial position as of
September  30, 2000,  and the results of our  operations  and cash flows for the
nine months ended  September 30, 2000 and September 30, 1999.  The  accompanying
financial  statements  should  be  read in  conjunction  with  the  consolidated
financial  statements and notes included in our 1999 annual report on Form 10-K.
Income from interim  periods may not be  indicative of future  results.  Certain
reclassifications  were made to conform prior period  financial  statements with
the  current  period  financial  statement  presentation.  Other  than as noted,
adjustments were of a normal, recurring nature.


2.         BUSINESS SEGMENTS

           We have six reportable segments: gas distribution, electric services,
gas exploration and production, energy services, energy investments and other.

           The  gas  distribution  segment  consists  of our two  New  York  gas
distribution  subsidiaries.  KeySpan  Energy  Delivery  New  York  provides  gas
distribution  services to customers  in the New York City  Boroughs of Brooklyn,
Queens and Staten  Island.  KeySpan  Energy  Delivery  Long Island  provides gas
distribution  services to  customers  in the Long Island  counties of Nassau and
Suffolk and the Rockaway Peninsula of the Borough of Queens.

           The electric  services segment consists of subsidiaries  that operate
the electric transmission and distribution system owned by the Long Island Power
Authority;  own and provide  capacity to and produce  energy for the Long Island
Power  Authority  from our  generating  facilities  located on Long Island;  and
manage fuel supplies for the Long Island Power Authority to fuel our Long Island
generating facilities, all through long-term service contracts having terms that
range from eight to fifteen years.  The electric  services segment also includes
subsidiaries that own, lease and operate the Ravenswood  facility in Queens, New
York.  Our contract  with  Consolidated  Edison  provided  them with 100% of the
available capacity of the Ravenswood facility on a fixed monthly fee and expired
on April 30,  2000.  We now provide all of the energy,  capacity  and  ancillary
services related to the Ravenswood  facility to the New York Independent  System
Operator.  Currently,  our primary  electric  generation  customers are the Long
Island Power  Authority  and the New York  Independent  System  Operator  energy
markets.

           The gas exploration and production  segment is engaged in gas and oil
exploration  and  production,  and the  development  and acquisition of domestic
natural gas and oil properties. This segment consists of our 70% equity interest
in Houston Exploration,  an independent natural gas and oil exploration company,
as well as KeySpan  Exploration  and  Production,  our wholly  owned  subsidiary
engaged in a joint venture with Houston Exploration.  On March 31, 2000, under a
pre-existing  credit  arrangement,  approximately  $80  million  in debt owed by
Houston   Exploration  to  us  was  converted  into  common  equity  of  Houston
Exploration.  Upon such  conversion,  our common  equity  ownership  interest in
Houston  Exploration  increased  from 64% to the current level of  approximately
70%.

                                      FS-6

<PAGE>



           The energy services segment primarily includes companies that provide
energy services to customers located within the New York tri-state  metropolitan
area,  Pennsylvania  and in Rhode  Island  through the  following  four lines of
business:  (i) home energy services provides residential  customers with service
and  maintenance  of  energy  systems  and  appliances,  as well  as the  retail
marketing of natural gas and electricity to residential customers; (ii) business
solutions  provides  professional  engineering-consulting  and  design of energy
systems for commercial  and  industrial  customers,  including  installation  of
plumbing,  heating,  ventilation and air conditioning equipment; (iii) commodity
procurement  provides  management and  procurement  services for fuel supply and
management of energy  sales,  primarily for the  Ravenswood  facility;  and (iv)
telecommunications  services  provides various services to carriers of voice and
data transmission on Long Island and in New York City.

           Subsidiaries  in the  energy  investments  segment  hold a 20% equity
interest in Iroquois,  a pipeline that transports Canadian gas supply to markets
in the Northeastern  United States;  a 50% interest in the Premier  Transmission
Pipeline and a 24.5% interest in Phoenix Natural Gas, both in Northern  Ireland;
investments  in certain  midstream  natural gas assets in western  Canada  owned
jointly with Gulf Canada Resources Limited,  through the Gulf Midstream Services
Partnership  and the ownership of certain oil  producing  properties in Alberta,
Canada.  These subsidiaries are primarily accounted for under the equity method.
Accordingly,  equity income from these  investments is reflected in other income
and  (deductions) in the consolidated  statement of income.  In October 2000, we
sold our interest in certain oil  producing  properties in Alberta,  Canada.  An
after-tax gain of  approximately  $1.3 million from the sale will be reported in
the fourth  quarter of 2000.  Further,  also in October  2000,  we acquired  the
remaining  50%  interest  in Gulf  Midstream  making  us the sole  owner of Gulf
Midstream.  The transaction required us to borrow an additional $48 million from
Canadian banks. For future financial reporting purposes,  the operations of Gulf
Midstream,  which  will now be known as  KeySpan  Energy  Canada,  will be fully
consolidated with our operations.

           The other segment represents primarily unallocated administrative and
general  expenses,  interest  income earned on temporary cash  investments,  and
preferred stock dividends.

           The  accounting  policies of the  segments are the same as those used
for the preparation of the consolidated  financial statements.  Our segments are
strategic  business units that are managed separately because of their different
operating and regulatory  environments.  At September 30, 2000, the total assets
of certain  reportable  segments  increased from levels reported at December 31,
1999 as follows: the energy services segment's assets increased by approximately
$260 million due primarily to the acquisition of four additional  companies that
provide energy-related services and the investment in MyHomeKey.com.

           The segment information  presented below reflects amounts reported in
the  consolidated  financial  statements for the nine months ended September 30,
2000 and 1999.

<TABLE>
<CAPTION>
                              Gas         Electric    Gas exploration    Energy       Energy
                          distribution    services     and production   services    investments   Other   Eliminations  Consolidated
--------------------------------------- ------------- ------------------------------------------------------------------------------
                                                                       (dollars in thousands)
<S>                          <C>          <C>               <C>          <C>          <C>        <C>          <C>         <C>
NINE MONTHS ENDED SEPTEMBER
  30, 1999

Unaffiliated Revenue         $1,208,254      $606,552        $103,622    $123,165      $1,510   $       -   $      -      $2,043,103
Intersegment Revenue                  -             -               -           -           -           -          -               -
Operating Income                198,565       112,652          29,879     (4,491)     (3,949)        7,564         -         340,220
Earnings for
  Common Stock                   92,873        59,786           9,239     (2,384)       5,937     (16,292)         -         149,159
Basic and Diluted
     Earnings Per Share           $0.66         $0.43           $0.07     ($0.02)       $0.04      ($0.12)   $     -           $1.06
NINE MONTHS ENDED SEPTEMBER
  30, 2000

Unaffiliated Revenue         $1,458,595    $1,097,616        $169,966    $480,511      $4,650   $       -    $     -      $3,211,338
Intersegment Revenue                  -             -               -      48,677           -           -      (48,677)            -
Operating Income                212,688       204,834          72,514      51,958     (4,022)     (15,864)         -         522,108
Earnings for
  Common Stock                  101,025       103,316          29,381      25,221       7,877     (43,033)         -         223,787
Basic and Diluted
     Earnings Per Share           $0.75         $0.77           $0.22       $0.19       $0.06      ($0.32)   $     -           $1.67

------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
3.         ENVIRONMENTAL MATTERS

           MANUFACTURED   GAS  PLANT  SITES:  We  have  identified   thirty-four
manufactured gas plant sites that were historically owned or operated by KeySpan
Energy  Delivery  New York and  KeySpan  Energy  Delivery  Long  Island (or such
companies' predecessors).  These former sites, some of which are no longer owned
by us, have been  identified to the New York State  Department of  Environmental
Conservation for inclusion on appropriate waste site inventories.

           We presently estimate that the remaining cost of our manufactured gas
plant-related  environmental  cleanup  activities  will  be  approximately  $119
million,  which  amount has been  accrued as our  current  best  estimate of our
aggregate   environmental   liability  for  known  sites.  The   currently-known
conditions  of the  former  manufactured  gas  plant  sites,  their  period  and
magnitude of operation, generally observed cleanup requirements and costs in the
industry,  current  land  use  and  ownership,  and  possible  reuse  have  been
considered  in  establishing  contingency  reserves.  We  believe  that  in  the
aggregate,  the accrued  liability  for  investigation  and  remediation  of the
manufactured gas plant sites identified above are reasonable estimates of likely
cost within a range of reasonable, foreseeable costs.

           Thirteen  of the  identified  sites  are  currently  the  subject  of
administrative consent orders with the Department of Environmental  Conservation
and another  site is subject to the  negotiation  of an  administrative  consent
order or an  agreement  under the  Department  of  Environmental  Conservation's
voluntary clean-up program.  Our remaining  manufactured gas plant sites may not
become subject to administrative  consent orders in the future,  and accordingly
no liability has been accrued for these sites.

           Under prior rate orders,  the Public Service  Commission of the State
of New York has allowed  recovery  of costs  related to certain  KeySpan  Energy
Delivery New York  manufactured  gas plant  sites.  We believe that current rate
plans in effect for both gas distribution  subsidiaries  provide for recovery of
environmental  costs attributable to the gas distribution  segment. At September
30,  2000,  we had a  total  regulatory  asset  of  approximately  $98  million.
Expenditures   incurred  to  date  by  us  with  respect  to  manufactured   gas
plant-related activities total approximately $20 million.

4.          LIQUIDITY AND FINANCINGS

           During the nine  months  ended  September  30,  2000,  we issued $1.6
billion and repaid $1.4 billion of commercial  paper to satisfy  working capital
needs and the mandatory  redemption of preferred stock as previously  discussed.
At September 30, 2000, we had $382.1 million of commercial paper  outstanding at
an average annualized interest rate of 6.73%.

           Houston  Exploration  also  issued  and  repaid  commercial  paper to
satisfy  working  capital needs during the nine months ended September 30, 2000.
For the nine months ended September 30, 2000, Houston  Exploration  borrowed $30
million under its credit  facility with a commercial bank and repaid $37 million
of  outstanding  borrowings.  At  September  30,  2000,  $174  million  remained
outstanding under this facility at a weighted average  annualized  interest rate
of 7.84%.  In  addition,  during the nine  months  ended  September  30,  2000 a
subsidiary in the energy  investments  segment  increased its  borrowings  under
revolving credit loan agreements with financial  institutions in Canada by $33.6
million.  At September  30, 2000,  $118  million was  outstanding  at a weighted
average annualized interest rate of 6.48%.

           On June 1, 2000, we redeemed, at maturity, all 14,520,000 outstanding
shares of our 7.95%  Preferred Stock Series AA. Our obligation of $370.2 million
included the mandatory  redemption  price of $25 per share totaling $363 million
and  dividends  payable  totaling  $7.2 million.  The  redemption  was satisfied
through the  utilization  of  internally  generated  funds and proceeds from the
issuance of commercial paper.

           KeySpan  Energy  Delivery  Long  Island  filed a  shelf  registration
statement with the  Securities and Exchange  Commission in December 1999 for the
issuance  of up to $600  million of medium  term  notes.  On  February  1, 2000,
KeySpan  Energy  Delivery  Long  Island  issued $400  million  7.875 % Notes due
February 1, 2010.  The net  proceeds  from the  issuance  were used to repay our
treasury for costs in extinguishing $397 million of promissory notes to the Long
Island  Power  Authority  that  matured in June 1999.  The medium term notes are
fully and unconditionally  guaranteed by us. At September 30, 2000, $200 million
of medium term notes remain available for issuance under this shelf registration
statement.


                                      FS-7

<PAGE>



           In August  2000,  we filed a shelf  registration  statement  with the
Securities  and Exchange  Commission  for the issuance of up to $1.65 billion of
debt  securities.  We intend to issue the Notes to replace short term borrowings
entered into in connection  with our  acquisitions  of Eastern and  EnergyNorth.
(See note 5 "Acquisition of Eastern.")

5.         ACQUISITION OF EASTERN

           On November 4, 1999, we and Eastern  announced that the companies had
signed a  definitive  merger  agreement  under which we will  acquire all of the
common stock of Eastern for $64.00 per share in cash, subject to adjustment. The
agreement  and plan of merger is included as an exhibit to our annual  report on
Form 10-K for the year ended  December 31,  1999.  The  transaction  has a total
value of approximately $2.5 billion and will be accounted for utilizing purchase
accounting.

           In  connection  with the  merger,  Eastern  has  amended  its  merger
agreement with  EnergyNorth to provide for an all cash acquisition by Eastern of
EnergyNorth  shares at a price per share of $61.00,  subject to adjustment.  The
restructured  EnergyNorth merger is expected to close contemporaneously with the
KeySpan/Eastern  transaction.  The EnergyNorth  transaction has a total value of
approximately $250 million.

           We intend to access the  financial  markets in the fourth  quarter of
2000 to  finance  approximately  $2  billion  for the  Eastern  and  EnergyNorth
transactions.  We intend to use Bridge  Financing and other  commercial paper to
fund these  transactions  initially and then replace the Bridge  Financing  with
$1.65 billion of Notes. We anticipate  issuing several  different  maturities of
Notes to balance our future debt capital maturity structure.

           We expect pre-tax annual cost savings resulting from the transactions
to be  approximately  $40 million.  These cost savings result primarily from the
elimination  of  duplicate  corporate  and  administrative   programs,   greater
efficiencies  in operations  and business  processes,  and increased  purchasing
efficiencies.  We expect to achieve  the  majority of the  reductions  through a
variety of programs which would include hiring freezes, attrition and separation
programs,  including  implementation of an early retirement program and targeted
voluntary  severance program.  We have initiated some of these programs and will
report the potential effect of these  initiatives on earnings and cash flow from
operations when job positions and cost estimates have been finalized.

           Following the closing of these  transactions,  we will become subject
to the  regulation  of the  Securities  and Exchange  Commission as a registered
holding  company  under the  Public  Utility  Holding  Company  Act of 1935,  as
amended.  As  such,  our  corporate  and  financial  activities  as  well as our
subsidiaries, including such entities' ability to pay dividends, will be subject
to Securities and Exchange Commission regulation. The merger is conditioned upon
the approval of the Securities  and Exchange  Commission.  Shareholders  of both
Eastern and EnergyNorth,  as well as the New Hampshire Public Utility Commission
(with  respect to  Eastern's  acquisition  of  EnergyNorth)  have  approved  the
transactions.  We anticipate  that the  transaction  will be  consummated in the
fourth  quarter of 2000,  but are unable to  determine  when or if the  required
Securities and Exchange Commission approval will be obtained.

6.         NEW YORK STATE INDEPENDENT SYSTEM OPERATOR MATTERS

           We currently  realize  revenues from our investment in the Ravenswood
facility through the wholesale sale of energy,  capacity and ancillary services.
Ancillary services include spinning reserves and non-spinning reserves available
to replace energy that is unable to be delivered due to the unexpected loss of a
major energy source.

           Due to the increase in the  market-clearing  price of reserves during
the first quarter of 2000, the New York  Independent  System Operator  requested
that the Federal Energy Regulatory  Commission  approve a bid cap on reserves as
well as requiring a refunding of so-called alleged "excess payments" received by
sellers into the ancillary  services market,  including the Ravenswood  facility
and the Long Island Power Authority. Other market participants, including buyers
of  reserves  and  electric  utilities  as  load  serving  entities  also  filed
complaints with the Federal Energy  Regulatory  Commission and intervened in the
various Federal Energy Regulatory  Commission  proceedings  related to reserves,
and proposed alternative remedies.

           On May 31, 2000, the Federal Energy  Regulatory  Commission issued an
order on spinning and  non-spinning  reserves that granted approval of a bid cap
for  non-spinning  reserves which includes  payments for the opportunity cost of
not making  energy  sales.  The other  requests - such as a bid cap for spinning
reserves,  retroactive refunds,  recalculation of reserve prices for March 2000,
and convening a technical conference and settlement proceeding - were

                                      FS-8

<PAGE>



rejected.  Pursuant to the May 31, 2000 order, the New York  Independent  System
Operator  made its first  compliance  filing to the  Federal  Energy  Regulatory
Commission on June 15, 2000.  However,  the New York Independent System Operator
and several other market  participants  have  requested  rehearing of the May 31
order.  In response to the New York  Independent  System Operator  request,  the
Federal Energy Regulatory Commission has allowed the New York Independent System
Operator to recalculate  prices for reserves for the March 2000 period as if the
bid cap approved  effective April 1, 2000 had been effective for March,  pending
its review on the rehearing requests of the May 31, 2000 order.

           On September  5, 2000,  New York State  Electric and Gas  Corporation
filed a lawsuit against the New York  Independent  System  Operator,  in Supreme
Court Broome County,  seeking recovery of overcharges and damages related to the
New York Independent System Operator's administration of the reserves market. We
are not a party to the lawsuit.

           Additionally,  the wholesale energy market has also been the focus of
increased  market  based  pricing.  On June 30, 2000,  the New York  Independent
System Operator petitioned the Federal Energy Regulatory Commission to approve a
$1,300/MWh  bid cap in the energy  market to be  effective  July 6, 2000 through
October 28, 2000. The New York Independent System Operator requested the bid cap
because it  believed  that there was a lack of price  responsive  demand and the
start-up  problems  associated with  implementation  of the New York Independent
System  Operator  might cause severe price spikes during the summer peak months.
In response,  on July 26, 2000, the Federal Energy Regulatory  Commission issued
an order approving a $1,000/MWh bid cap in the energy market  effective July 26,
2000  through  October 28,  2000.  The July 26 order also  required the New York
Independent  System  Operator to identify  certain "market flaw problems" and to
report them to the Federal Energy Regulatory Commission by September 1, 2000.

           On September 8, 2000 the New York Independent  System Operator issued
to  the  Federal  Energy  Regulatory  Commission  revised  tariff  sheets  and a
corrected combined compliance filing and report related to reserve markets.  The
compliance  filing proposes tariff changes to become effective  November 1, 2000
with the  exception of the  effective  date for the payment of lost  opportunity
costs to  suppliers  of  10-minute  reserves,  where  such  filing  proposes  an
effective  date of May 31,  2000.  The  compliance  filing  proposed a number of
changes, including the gradual removal of the bid cap in the reserve market from
$15/MWh on November 1, 2000,  to $30/MWh on January 1, 2001 and to  eliminate it
completely  on May 1, 2001.  Various  parties filed  comments to the  compliance
filing requesting  additional changes including  extending the $1,000/MWh energy
price cap beyond  October 28,  2000.  The  compliance  filing and  comments  are
pending the Federal Energy Regulatory Commission review.

           We are  opposing  the relief  requested  by the New York  Independent
System  Operator  and the load  serving  entities  and believe that the ultimate
resolution of these issues will not have a material  effect on our  consolidated
financial position or results of operations.

7.         DERIVATIVE FINANCIAL INSTRUMENTS

           In connection with our  anticipated  purchase of Eastern (see note 5,
"Acquisition of Eastern") and the  anticipated  issuance of Notes to finance the
acquisition, we entered into forward starting swap agreements to hedge a portion
of the risk  that the cost of the  future  issuance  of  fixed-rate  debt may be
adversely affected by changes in interest rates.  Through September 30, 2000, we
have entered into $1.5 billion of forward starting swap agreements with interest
rates that range from 6.86% to 7.78%. The maturities on these  instruments range
from 5 to 30 years. Under a forward starting swap, we agree to pay or receive an
amount equal to the  difference  between the net present value of the cash flows
for a notional amount of  indebtedness  based on the existing yield of a hedging
instrument  at the  date of the  agreement  and at the  date  the  agreement  is
settled.  Gains and losses on interest rate lock agreements will be deferred and
amortized  over the  life of the  underlying  debt to be  issued.  The  notional
amounts  of the  agreements  are not  exchanged.  We  have  entered  into  these
agreements with more than one major  financial  institution in order to minimize
counter  party credit risk.  Based on interest  rates as of October 30, 2000, we
estimate  that  we may be  obligated  to pay  counterparties  approximately  $60
million at the time of issuance of the Notes. This amount will be amortized over
the life of the Notes. This amount reflects the significant decrease in interest
rates since we entered into the forward starting swap agreements. As a result of
the decrease in interest  rates, we anticipate that we will be able to issue the
Notes at rates that will be lower than originally projected.

           During the third  quarter of 2000,  we also  entered into a number of
derivative  swap  instruments  to fix the  selling  price  on a  portion  of our
estimated 2001 summer peak electric sales through the Ravenswood facility and to
fix the

                                      FS-9

<PAGE>



purchase price of fuel used to generate electricity.  For the months of July and
August 2001, we have hedged the sales price on 105,600  megawatt hours of summer
peak electric sales to protect against a potential  degradation in market prices
during the summer.  Under these swap  agreements,  we will receive a fixed price
per  megawatt  hour of  electricity  sold  during  summer peak hours and pay the
counter party the then current  floating market price for peak electric  supply.
We will receive the then current  floating  market price of peak electric energy
when the Ravenswood  facility sells electric energy to the New York  Independent
System Operator.  These  derivatives are accounted for as hedges. We also have a
tolling  arrangement  with two counter parties under which we have "locked-in" a
profit  margin  on 52,800  megawatt  hours of summer  season  sales and  211,200
megawatt  hours of winter sales.  Under these  arrangements,  we will receive an
up-front  fee and will pay the counter  party,  on a monthly  basis,  our actual
realized  profit margin from the sale of electric  energy.  As a result of these
hedging arrangements, we have hedged approximately 9% of our estimated peak 2001
summer electric sales and approximately 6% of our estimated 2001 yearly electric
sales.

8.         NEW FINANCIAL ACCOUNTING STANDARDS

     In June 1999, the Financial  Accounting  Standards  Board  ("FASB")  issued
Statement of Financial  Accounting  Standard  ("SFAS") No. 137,  "Accounting for
Derivative  Instruments and Hedging  Activities - Deferral of the Effective Date
of SFAS No.  133." SFAS No. 137  defers  the  effective  date of SFAS No. 133 to
fiscal years beginning after July 15, 2000. We will therefore adopt SFAS No. 133
in the first quarter of fiscal year 2001.  SFAS No. 133  establishes  accounting
and reporting standards for derivative instruments and for hedging activities.

           In June 2000, the FASB issued SFAS No. 138,  "Accounting  for Certain
Derivative  Instruments  and Certain  Hedging  Activities - An Amendment of FASB
Statement No 133." SFAS No. 138 amends the accounting and reporting standards of
SFAS No. 133 for a number of  transactions.  The most  significant  amendment to
SFAS 133 as it relates to our operations is that the normal purchases and normal
sales  exception  found  in SFAS  133  may  now be  applied  to  contracts  that
implicitly or explicitly permit net settlement, and contracts that have a market
mechanism  to  facilitate  net  settlement.  Therefore,  under  SFAS 138 our gas
procurement contracts are not considered derivative financial instruments.

           All of our derivative financial  instruments,  except for an interest
rate swap, are cash-flow hedges.  SFAS No. 133 requires that an entity recognize
all  derivatives  as either assets or  liabilities in the statement of financial
position and measure those instruments at fair value. Periodic changes in market
value of derivatives which meet the definition of a cash-flow hedge are recorded
as  comprehensive  income,  subject to  effectiveness,  and then included in net
income to match the underlying hedged transactions.  Our derivative  instruments
currently in place qualify for hedge accounting, and as a result, implementation
of SFAS No.  133 and  SFAS  No.  138 when  adopted  are not  expected  to have a
material  effect on our net  income,  but  could  have a  significant  effect on
comprehensive  income  because  of  fluctuations  in  the  market  value  of the
derivatives employed for hedging certain risks.



                                      FS-10

<PAGE>


<TABLE>
                                                 EASTERN'S CONSOLIDATED BALANCE SHEET
<CAPTION>

                                                                         SEPTEMBER 30,         DECEMBER 31,        SEPTEMBER 30,
                                                                              1999                 1999                 2000
                                                                        ----------------     ----------------    ------------------
                                                                                              (in thousands)
<S>                                                                           <C>                   <C>                 <C>

ASSETS

CURRENT ASSETS
  Cash and short-term investments                                       $         30,718     $         44,332    $           39,122
  Receivables, less reserves                                                      87,920              135,409                74,397
  Inventories                                                                     76,340               74,555               101,952
  Deferred gas costs                                                              21,589               64,503                85,000
  Other current assets                                                             7,319                5,008                 8,073
                                                                        ----------------     ----------------    ------------------
     TOTAL CURRENT ASSETS                                                        223,886              323,807               308,544

PROPERTY AND EQUIPMENT, AT COST                                                2,179,169            2,197,156             2,222,650
   Less accumulated depreciation                                                 910,068              906,953               943,081
                                                                        ----------------     ----------------    ------------------
      NET PROPERTY AND EQUIPMENT                                               1,269,101            1,290,203             1,279,569

  Goodwill, less amortization                                                    248,351              247,137               242,497
  Deferred postretirement health care costs                                       74,551               72,760                68,579
  Investments                                                                     15,437               14,671                14,265
  Deferred charges and other costs, less amortization                             77,169               71,179                70,199
                                                                        ----------------     ----------------    ------------------
    TOTAL OTHER ASSETS                                                           415,508              405,747               395,540
                                                                        ----------------     ----------------    ------------------

     TOTAL ASSETS                                                       $      1,908,495     $      2,019,757    $        1,983,653
                                                                        ================     ================    ==================

LIABILITIES AND SHAREHOLDERS' EQUITY
CURRENT LIABILITIES
  Current debt                                                                    61,984           $  123,251               128,062
  Accounts payable                                                                57,456               75,770                63,914
  Accrued expenses                                                                40,322               37,516                39,887
  Other current liabilities                                                       48,678               50,234                50,946
                                                                        ----------------     ----------------    ------------------
     TOTAL CURRENT LIABILITIES                                                   208,440              286,771               282,809

GAS INVENTORY FINANCING                                                           43,285               54,020                59,657

LONG-TERM DEBT                                                                   516,683              515,232               501,937

RESERVES AND OTHER LIABILITIES
  Deferred income taxes                                                          174,069              179,426               183,728
  Postretirement health care                                                      98,946              100,016                97,253
  Preferred stock of subsidiary                                                   26,447               26,454                16,737
  Other reserves                                                                 104,866              103,208               101,420
                                                                        ----------------     ----------------    ------------------
      TOTAL RESERVES AND OTHER LIABILITIES                                       404,328              409,104               399,138

Commitments and Contingencies

SHAREHOLDERS' EQUITY
  Common stock, $1.00 par value;  Authorized shares 50,000,000;  Issued shares
  27,173,322  at September  30,  2000;  27,131,090  at December 31, 1999,  and
  22,649,457 at
  September 30, 1999                                                              27,021               27,131                27,183
  Capital in excess of par value                                                 240,532              244,449               246,845
  Retained earnings                                                              468,970              483,710               466,512
  Accumulated other comprehensive (loss)                                            (417)                 (77)                  155
    Treasury stock at cost - 16,892 shares at June 30, 2000 and
    December 31, 1999; and 10,461 shares at June 30, 1999                           (347)                (583)                 (583)
                                                                        ----------------     ----------------    ------------------
       TOTAL SHAREHOLDERS' EQUITY                                                735,759              754,630               740,112
                                                                        ----------------     ----------------    ------------------

     TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY                         $      1,908,495     $      2,019,757    $        1,983,653
                                                                        ================     ================    ==================
</TABLE>

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

                                      FS-11

<PAGE>


<TABLE>
                                                  EASTERN'S CONSOLIDATED STATEMENT OF INCOME
<CAPTION>

                                                                                NINE MONTHS ENDED
                                                                     ---------------------------------------
                                                                       SEPTEMBER 30,        SEPTEMBER 30,
                                                                            1999                 2000
                                                                     ------------------   ------------------
                                                                             (dollars in thousands)
<S>                                                                            <C>                  <C>
REVENUES                                                                       $660,327             $807,548
OPERATING COSTS AND EXPENSES
      Operating Costs                                                           461,066              561,926
      Selling, general and administrative expenses                               84,658              110,922
      Depreciation and amortization                                              59,790               73,051
                                                                     ------------------   ------------------
                                                                                603,514              745,899

OPERATING EARNINGS                                                               54,813               61,649

OTHER INCOME (EXPENSES)
      Interest income                                                             7,488                2,543
      Interest expense                                                          (27,062)             (35,221)
      Other, net                                                                  9,115                2,682
                                                                     ------------------   ------------------

EARNINGS BEFORE INCOME TAXES                                                     44,354               31,653
Provision for income taxes                                                       17,449               13,828
                                                                     ------------------   ------------------

NET EARNINGS                                                         $           26,905   $           17,825
                                                                     ==================   ==================

BASIC EARNINGS PER SHARE                                             $             1.16   $             0.66

DILUTED EARNINGS PER SHARE                                           $             1.16   $             0.65

DIVIDENDS PER SHARE                                                  $             1.26   $             1.29
</TABLE>

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


                                      FS-12

<PAGE>


<TABLE>
                                                EASTERN'S CONSOLIDATED STATEMENT OF CASH FLOWS
<CAPTION>

                                                                                       NINE MONTHS ENDED
                                                                     -----------------------------------------------------
                                                                           SEPTEMBER 30,               SEPTEMBER 30,
                                                                               1999                        2000
                                                                     -------------------------   -------------------------
                                                                                    (dollars in thousands)
<S>                                                                                   <C>                         <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
      NET EARNINGS                                                   $                  26,905   $                  17,825
      Adjustments to reconcile net earnings to net cash
            provided by operating activities:
      Depreciation and amortization                                                     59,790                      73,051
      Income taxes and tax credits                                                      (7,175)                         28
      Net gain on sale of assets                                                        (2,281)                     (1,819)
      Other changes in assets and liabilities:
      Receivables                                                                       29,875                      61,012
      Inventories                                                                       (5,477)                    (27,397)
      Deferred gas costs                                                                32,391                     (20,497)
      Accounts payable                                                                  (9,644)                    (11,857)
      Other                                                                                496                       6,283
                                                                     -------------------------   -------------------------
      NET CASH PROVIDED BY OPERATING ACTIVITIES                                        124,880                      96,629
                                                                     -------------------------   -------------------------
CASH FLOWS FROM INVESTING ACTIVITIES:
      Capital expenditures                                                             (46,971)                    (51,646)
      Acquisition of Colonial Gas, net of cash acquired                               (150,446)                          -
      Investments                                                                       (7,784)                     (8,843)
      Proceeds on sale of assets                                                         6,697                       9,853
      Other                                                                             (2,632)                    (10,047)
                                                                     -------------------------   -------------------------
      NET CASH USED BY INVESTING ACTIVITIES                                           (201,136)                    (60,683)
                                                                     -------------------------   -------------------------
CASH FLOWS FROM FINANCING ACTIVITIES:
      Dividends paid                                                                   (28,458)                    (34,963)
      Changes in notes payable                                                         (12,835)                      5,547
      Changes in gas inventory financing                                                (9,359)                      5,637
      Proceeds from issuance of long-term debt
      Repayment of long-term debt and preferred stock                                   (6,442)                    (23,336)
      Other                                                                              2,894                       5,959
                                                                     -------------------------   -------------------------
NET CASH PROVIDED (USED) BY FINANCING ACTIVITIES                                       (54,200)                    (41,156)
                                                                     -------------------------   -------------------------
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                                  (130,456)                     (5,210)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR                                         159,836                      44,332
                                                                     -------------------------   -------------------------
CASH AND CASH EQUIVALENTS AT END OF PERIOD                                              29,380                      39,122
SHORT-TERM INVESTMENTS                                                                   1,338                           -
Cash and short-term investments                                                        $30,718                     $39,122
                                                                     =========================   =========================
</TABLE>

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


                                      FS-13

<PAGE>



              EASTERN'S NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


1.         ACCOUNTING POLICIES

           It is Eastern's opinion that the financial  information  contained in
this report  reflects all  adjustments  necessary to present a fair statement of
results  for the  periods  reported.  All of these  adjustments  are of a normal
recurring  nature.  Results for the periods are not  necessarily  indicative  of
results to be expected  for the year,  due to the  seasonal  nature of Eastern's
operations.  All  accounting  policies have been applied in a manner  consistent
with  prior  periods.   Such  financial   information  is  subject  to  year-end
adjustments and annual audit by independent public accountants.

           The preparation of financial  statements in conformity with generally
accepted  accounting  principles  requires  management  to  make  estimates  and
assumptions  that affect the  reported  amounts of assets and  liabilities,  the
disclosure of  contingent  assets and  liabilities  at the date of the financial
statements  and the  reported  amounts  of  revenues  and  expenses  during  the
reporting period. Actual results could differ from those estimates.

           These interim financial statements should be read in conjunction with
Eastern's 1999 annual report filed on form 10-K with the Securities and Exchange
Commission.

EARNINGS PER SHARE

           Basic  earnings per share is based on the weighted  average number of
shares  outstanding.  Diluted earnings per share gives effect to the exercise of
stock options using the treasury stock method, as reflected below:



                                                     NINE MONTHS ENDED
                                                        SEPTEMBER 30,
                                          --------------------------------------
                                                1999                  2000
--------------------------------------------------------------------------------
                                                      (in thousands)

Weighted average shares                             23,120                27,152
Dilutive effect of options                             119                   264
                                          ----------------      ----------------
Adjusted weighted average shares                    23,239                27,416
                                          ================      ================

COMPREHENSIVE INCOME

           The following is a summary of the  reclassification  adjustments  and
the income tax effects for the components of other  comprehensive  income (loss)
for the nine months ended September 30:


<TABLE>
<CAPTION>
                                                         Unrealized
                                                       Holding Gains                 Reclassification
                                                        (Losses) on                    Adjustments
                                                        Investments                     for Gains                        Other
                                                       Arising During                  Included in                   Comprehensive
                                                         the Period                     Net Income                   Income (Loss)
-------------------------------------------- ---  ------------------------  --- ---------------------      ------------------------
                                                                                      (in thousands)
<S>                                                             <C>                            <C>                           <C>
NINE MONTHS ENDED SEPTEMBER 30, 1999

Pretax                                            $                 72      $                     (552)     $                  (480)
Income tax benefit (expense)                                       (25)                            193                         (168)
                                                  --------------------      --------------------------      -----------------------
   Net change                                     $                 47      $                     (359)     $                  (312)
                                                  ====================      ==========================      =======================

NINE MONTHS ENDED SEPTEMBER 30, 2000
Pretax                                            $              1,869      $                   (1,512)     $                   357
Income tax benefit (expense)                                      (654)                            529                         (125)
                                                  --------------------      --------------------------      -----------------------
   Net change                                     $              1,215      $                     (983)     $                   232
                                                  ====================      ==========================      =======================
</TABLE>


                                      FS-14

<PAGE>



2.         PLANNED MERGER WITH KEYSPAN

           On November  4, 1999,  Eastern  signed a  definitive  agreement  that
provides for the merger of Eastern with a  wholly-owned  subsidiary  of KeySpan,
with Eastern  surviving  the merger and becoming a  wholly-owned  subsidiary  of
KeySpan. In the merger,  holders of Eastern common stock will receive $64.00 per
share, in cash, subject to adjustment.

3.         PLANNED MERGER WITH ENERGYNORTH, INC.

           Under a  definitive  agreement  signed in 1999,  Eastern  expects  to
acquire  EnergyNorth for approximately $203 million in cash  simultaneously with
Eastern's  merger  with  KeySpan.  If the  KeySpan  merger  is  terminated,  the
agreement  provides for Eastern to acquire  EnergyNorth  for  approximately  $78
million  in cash  and  1.7  million  in  Eastern  shares,  subject  to a  collar
arrangement.

4.         BUSINESS SEGMENTS

           Eastern's  reportable  business segment  information for revenues and
operating earnings is presented below:



REVENUES                                       NINE MONTHS ENDED
                                                 SEPTEMBER 30,
                                    ---------------------------------------
                                          1999                   2000
                                    ----------------       ----------------
                                                (in thousands)

Natural Gas Distribution            $        452,441       $        576,084
Marine Transportation                        196,799                211,751
Other Services                                11,087                 19,713
                                    ----------------       ----------------
                                    $        660,327       $        817,548
                                    ================       ================


OPERATING EARNINGS (LOSS)                      NINE MONTHS ENDED
                                                 SEPTEMBER 30,
                                    ---------------------------------------
                                          1999                   2000
                                    -----------------       ---------------
                                                (in thousands)

Natural Gas Distribution            $          45,942       $        56,649
Marine Transportation                          15,605                11,773
Other Services                                 (3,724)               (1,689)
Headquarters                                   (3,010)               (5,084)
                                    -----------------       ---------------
                                    $          54,813       $        61,649
                                    =================       ===============


5.         INVENTORIES

           THE COMPONENTS OF INVENTORIES WERE AS FOLLOWS:


                                                            SEPTEMBER 30,
                                                                 2000
                                                      --------------------------
                                                            (in thousands)
Supplemental gas supplies                             $                   85,329
Other materials, supplies and marine fuels                                16,623
                                                      --------------------------
                                                      $                  101,952
                                                      ==========================



                                      FS-15

<PAGE>



6.         SUPPLEMENTAL CASH FLOW INFORMATION

           THE FOLLOWING ARE SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:


                                                         NINE MONTHS ENDED
                                                           SEPTEMBER 30,
                                               ---------------------------------
                                                    1999                   2000
                                               ---------------       -----------
                                                           (in thousands)

Cash paid during the year for:
  Interest, net of amounts capitalized         $     17,711       $      29,094
  Income taxes                                 $     24,523       $      16,185




                                      FS-16

<PAGE>



                      [THIS PAGE INTENTIONALLY LEFT BLANK]




                                      FS-17

<PAGE>




PROSPECTUS

                                [GRAPHIC_OMITTED]






                               KEYSPAN CORPORATION

                                 $1,650,000,000
                                 DEBT SECURITIES

          -    We plan to issue up to $1,650,000,000 of debt securities.

          -    The  debt  securities  may be  offered  as  separate  series,  in
               amounts,  prices and on terms to be determined at the time of the
               sale. When we offer debt  securities,  we will provide you with a
               prospectus supplement or a term sheet describing the terms of the
               specific issue of debt securities including the offering price of
               the securities.

          -    We may  sell the  debt  securities  to  agents,  underwriters  or
               dealers, or may sell them directly to other purchasers.

          -    You should read this prospectus and the prospectus  supplement or
               the term sheet relating to the specific issue of debt  securities
               carefully before you invest.

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


           Neither  the  Securities  and  Exchange   Commission  nor  any  state
securities commission has approved or disapproved these securities or determined
if this prospectus is truthful or complete.  Any  representation to the contrary
is a criminal offense.

     The information in this  prospectus is not complete and may be changed.  We
may not sell these securities  until the  registration  statement filed with the
Securities and Exchange Commission is effective. This prospectus is not an offer
to  sell  these  securities  and it is not  soliciting  an  offer  to buy  these
securities in any state where the offer or sale is not permitted.


                The date of this prospectus is October 26, 2000.



<PAGE>


<TABLE>
<CAPTION>
                                                               TABLE OF CONTENTS

                                                                                                                     Page

<S>                                                                                                                   <C>
About this Prospectus...................................................................................................1

Risk Factors............................................................................................................1

Where You Can Find More Information.....................................................................................1

Forward-Looking Statements..............................................................................................2

KeySpan    .............................................................................................................3

Use of Proceeds.........................................................................................................3

Ratio of Earnings to Fixed Charges......................................................................................4

Description of Securities...............................................................................................5

Certain U.S. Federal Income Tax Consequences to Non-U.S. Persons ......................................................16

Plan of Distribution...................................................................................................18

Legal Opinions.........................................................................................................19

Experts    ............................................................................................................19
</TABLE>



<PAGE>



                             ABOUT THIS PROSPECTUS



           As used in this  prospectus  and any  prospectus  supplement  or term
sheet,  except as the  context  otherwise  requires,  "we,"  "us,"  "our,"  "our
Company," and "KeySpan" mean KeySpan Corporation, together with its consolidated
subsidiaries.


                                  RISK FACTORS

           For each series of debt securities,  we will include risk factors, if
appropriate, in the prospectus supplement relating to that series.


                       WHERE YOU CAN FIND MORE INFORMATION

           We file annual,  quarterly and special reports,  proxy statements and
other  information with the SEC. You may read and copy any of these documents at
the SEC's public  reference  rooms in  Washington,  D.C., New York, New York and
Chicago, Illinois. Please call the SEC at 1-800-SEC-0330 for further information
on the public  reference rooms. Our SEC filings are also available to the public
on the SEC's web site at http://www.sec.gov.
                         -------------------

           We filed a  registration  statement on Form S-3 with the SEC covering
the debt securities.  For further information on us and the debt securities, you
should refer to the  registration  statement and its exhibits.  This  prospectus
summarizes material provisions of the indenture.  Because the prospectus may not
contain all the information  that you may find important,  you should review the
full text of these  documents.  We have included copies of these documents in an
exhibit to our registration statement of which this prospectus is a part.

           The SEC allows us to "incorporate by reference" the information  that
we file with the SEC, which means that we can disclose important  information to
you by  referring  you to  those  documents.  The  information  incorporated  by
reference is considered  to be part of this  prospectus,  and later  information
that the we file  with the SEC will  automatically  update  and  supersede  this
information.  We  incorporate  by reference the  documents  listed below and any
future filings made with the SEC under Sections  13(a),  13(c),  14, or 15(d) of
the Securities Exchange Act of 1934 until all of the securities are sold.

          -    Our Annual Report on Form 10-K for the fiscal year ended December
               31, 1999;

          -    Our Quarterly Report on Form 10-Q for the quarterly periods ended
               March 31, 2000 and June 30, 2000;

          -    Our Current  Reports on Form 8-K January  19,  2000,  January 27,
               2000,  February 1, 2000,  March 27, 2000, July 12, 2000, July 26,
               2000 and October 6, 2000.

           You may request a copy of these  filings,  or any of our SEC filings,
at no cost, over the Internet at our web site at http://www.keyspanenergy.com or
by writing or telephoning us at the following address:

                               Investor Relations
                               KeySpan Corporation
                              One MetroTech Center
                            Brooklyn, New York, 11201
                                 (718) 403-3385

           You should rely only on the information  incorporated by reference or
provided  in this  prospectus  or any  supplement  or term  sheet.  We have  not
authorized  anyone else to provide you with  different  information.  We are not
making an offer of these  debt  securities  in any state  where the offer is not
permitted.  You should not assume that the information in this prospectus or any
supplement  is accurate as of any date other than the date on the front of these
documents.


                                        1

<PAGE>




                           FORWARD-LOOKING STATEMENTS

           Some of the information  included in this prospectus,  any prospectus
supplement  or term sheet and the  documents we have  incorporated  by reference
contain forward-looking  statements within the meaning of the Private Securities
Litigation  Reform Act of 1995,  as amended.  Such  statements  relate to future
events or our future financial  performance.  We use words such as "anticipate,"
"believe," "expect," "may," "project," "will" or other similar words to identify
forward-looking statements.

           Without limiting the foregoing, all statements relating to our

          -    anticipated capital expenditures,

          -    future cash flows and borrowings,

          -    pursuit of potential future acquisition opportunities, and

          -    sources of funding

are forward-looking  statements.  These forward-looking  statements are based on
numerous assumptions that we believe are reasonable, but they are open to a wide
range of  uncertainties  and  business  risks  and  actual  results  may  differ
materially from those discussed in these statements.

           Among  the  factors  that  could  cause  actual   results  to  differ
materially are:

          -    available sources and costs of fuel;

          -    volatility of energy prices in a deregulated market environment;

          -    federal   and  state   regulatory   initiatives   that   increase
               competition,  threaten  cost and  investment  recovery and impact
               rate structure;

          -    our ability to successfully reduce our cost structures;

          -    the successful integration of Eastern and EnergyNorth;

          -    the degree to which we develop unregulated business ventures;

          -    our ability to identify and make complementary  acquisitions,  as
               well as the successful integration of those acquisitions; and

          -    inflationary trends and interest rates.

           When considering these forward-looking statements, you should keep in
mind the cautionary  statements in this document,  any prospectus  supplement or
term sheet and the documents incorporated by reference. We will not update these
statements unless the securities laws require us to do so.




                                        2

<PAGE>



                                     KEYSPAN

      KeySpan was formed in connection  with a business  combination in May 1998
of KeySpan Energy Corporation, the parent of The Brooklyn Union Gas Company, and
certain businesses of the Long Island Lighting Company. Our core business is gas
distribution,  conducted by our two  regulated  gas  subsidiaries,  The Brooklyn
Union Gas Company  d/b/a KeySpan  Energy  Delivery New York and KeySpan Gas East
Corporation d/b/a KeySpan Energy Delivery Long Island. Together, they distribute
gas to approximately 1.6 million customers.

      We are also a major,  and growing,  generator of  electricity.  We own and
operate five large  generating  plants and 42 smaller  facilities  in Nassau and
Suffolk Counties on Long Island and lease and operate a major facility in Queens
County in New York City.  Under  contractual  arrangements,  we  provide  power,
electric  transmission-and-distribution  services,  billing  and other  customer
services for  approximately  one million  electric  customers of the Long Island
Power Authority.  Our other subsidiaries are involved in oil and gas exploration
and production;  gas storage;  wholesale and retail gas and electric  marketing;
appliance service;  heating,  ventilation and air conditioning  installation and
services;   large   energy-system   ownership,   installation   and  management;
telecommunications;  energy-related internet activities; and fuel cells. We also
invest  in,  and  participate  in  the  development  of,   pipelines  and  other
energy-related projects, domestically and internationally.

      In November 1999, KeySpan and Eastern Enterprises  announced that they had
signed a  definitive  merger  agreement  under which we will  acquire all of the
common stock of Eastern for $64.00 per share in cash, subject to adjustment. The
transaction  has a total value of  approximately  $2.5 billion  ($1.7 billion in
equity and $0.8 billion in assumed debt and preferred  stock).  The  transaction
will be accounted for as a purchase.

      Eastern owns and operates Boston Gas Company,  Colonial Gas Company, Essex
Gas Company,  Midland Enterprises Inc.,  Transgas Inc. and ServicEdge  Partners,
Inc. In July 1999, Eastern announced it had entered into an agreement to acquire
EnergyNorth,  Inc. owner of New  Hampshire's  largest  natural gas  distributor,
EnergyNorth  Natural Gas, Inc.  EnergyNorth is located across the  Massachusetts
border from,  but  contiguous  to, areas  served by Eastern's  gas  distribution
subsidiaries. In connection with our acquisition of Eastern, Eastern has amended
its  agreement  with  EnergyNorth  to  provide  for an all cash  acquisition  of
EnergyNorth  shares at a price per share of $61.13,  subject to adjustment.  The
restructured EnergyNorth acquisition is expected to close contemporaneously with
the KeySpan/Eastern transaction.

      The increased  size and scope of our combined  organization  should enable
KeySpan,  Eastern and EnergyNorth to provide enhanced,  cost-effective  customer
service and to capitalize on the above-average  growth opportunities for natural
gas in  the  Northeast  and  provide  additional  resources  to our  unregulated
businesses.  The  combined  company  will serve  approximately  2.4  million gas
customers.

      The  transactions  among  KeySpan,  Eastern and  EnergyNorth  have already
received all required shareholder approvals,  as well as the approval of the New
Hampshire  Public  Utility  Commission.  However,  it is  conditioned  upon  the
approval of the SEC,  which is  currently  reviewing  applications  filed by us,
Eastern  and  EnergyNorth  under the Public  Utility  Holding  Company  Act.  We
anticipate that the transactions can be completed before the end of 2000, but we
are unable to determine when or if the required SEC approvals will be obtained.

      We are a  holding  company  with no  independent  operations  or source of
income of our own. We conduct  substantially  all of our operations  through our
subsidiaries  and, as a result,  we depend on the earnings and cash flow of, and
dividends or distributions from, our subsidiaries to provide the funds necessary
to meet our debt and contractual obligations. Furthermore, a substantial portion
of our  consolidated  assets,  earnings  and  cash  flow  is  derived  from  the
operations of our regulated utility  subsidiaries,  whose legal authority to pay
dividends or make other  distributions to us is subject to regulation by the New
York Public Service Commission.


                                 USE OF PROCEEDS

      We are issuing the debt  securities in order to finance our acquisition of
Eastern and EnergyNorth, by either using the proceeds to finance the acquisition
of Eastern's  and  EnergyNorth's  common  stock or for any other proper  Company
purpose,  including to redeem or replace short term financing instruments,  such
as bank loans or commercial paper issued to finance those acquisitions.

                                        3

<PAGE>



<TABLE>
                       RATIO OF EARNINGS TO FIXED CHARGES
<CAPTION>
      The  following  table  shows our  consolidated  ratio of earnings to fixed
charges for the periods indicated.
<S>                 <C>                 <C>       <C>                            <C>                 <C>                 <C>
                     Twelve Months Ended                                           Nine Months         Year               Six Months
--------------------------------------------------------------
                                                                                   Ended               Ended                 Ended
December 31,                            March 31                                   December 31         December 31          June 30,
                          ------------------------------------
1996 (a)                  1997 (a)                  1998(a)                        1998                1999                   2000

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

2.15                      2.21                      2.44                           (b)                 3.23                   4.14
</TABLE>
--------------
(a)  Represents  ratio of earnings to fixed  charges for our  predecessor,  Long
Island Lighting Company.

      For the nine months ended December 31, 1998, earnings were insufficient to
      cover  fixed  charges  by $365.0  million.  During the nine  months  ended
      December 31, 1998, we incurred the following  special charges (after tax):
      charges  associated  with  the  transaction  with the  Long  Island  Power
      Authority of $107.9  million;  charges  associated with the combination of
      Long Island Lighting  Company's gas and electric services  businesses with
      KeySpan  Corporation  of $83.5  million;  an  impairment  charge  of $54.1
      million to write-down  the value of proved gas  reserves;  and a charge of
      $13.0 million to establish a not-for-profit philanthropic foundation.










                                        4

<PAGE>



                           DESCRIPTION OF SECURITIES



       IN THIS DESCRIPTION, "WE," "US," "OUR," "OUR COMPANY," AND "KEYSPAN" MEAN
KEYSPAN  CORPORATION  AND NOT ANY OF OUR  SUBSIDIARIES.  CAPITALIZED  TERMS USED
BELOW ARE DEFINED UNDER "MATERIAL COVENANTS - DEFINED TERMS."

       The  debt  securities  will be  issued  under an  indenture,  dated as of
November 1, 2000,  between us and The Chase  Manhattan  Bank,  as  trustee.  The
indenture  provides for the issuance from time to time of debt  securities in an
unlimited dollar amount and an unlimited number of series.

       The following  description of the terms of the debt securities summarizes
the material terms that will apply to the debt  securities.  The  description is
not complete,  and we refer you to the indenture,  a copy of which is an exhibit
to the  registration  statement  of which this  prospectus  is a part.  For your
reference,  in several  cases below we have noted the  section in the  indenture
that the paragraph  summarizes.  Capitalized terms have the meanings assigned to
them  in the  indenture.  The  referenced  sections  of the  indenture  and  the
definitions of capitalized  terms are incorporated by reference in the following
summary.

       Prospective  purchasers of debt  securities  should be aware that special
U.S. Federal income tax,  accounting and other  considerations may be applicable
to instruments  such as the debt securities.  The prospectus  supplement or term
sheet   relating  to  an  issue  of  debt   securities   will   describe   these
considerations, if they apply.

SPECIFIC TERMS OF EACH SERIES

      Each time that we issue a new series of debt  securities,  the  prospectus
supplement or term sheet relating to that new series will specify the particular
amount, price and other terms of those debt securities. These terms may include:

          -    the title of the debt securities;

          -    any limit on the total principal amount of the debt securities;

          -    the date or dates on which the  principal of the debt  securities
               will be payable or their manner of determination;

          -    the interest  rate or rates of the debt  securities;  the date or
               dates from which interest will accrue on the debt securities; and
               the interest  payment dates and the regular  record dates for the
               debt securities; or, in each case, their manner of determination;

          -    the  place or places  where  the  principal  of and  premium  and
               interest on the debt securities will be paid;

          -    the period or periods within which,  the price or prices at which
               and  the  terms  on  which  any of  the  debt  securities  may be
               redeemed,  in whole or in part at our option, and any remarketing
               arrangements;

          -    the  terms on which we would  be  required  to  redeem,  repay or
               purchase debt securities required by any sinking fund,  mandatory
               redemption or similar provision; and the period or periods within
               which,  the price or prices at which and the terms and conditions
               on which  the debt  securities  will be so  redeemed,  repaid  or
               purchased in whole or in part;

          -    the denomination in which the debt securities will be issued,  if
               other  than  denominations  of  $1,000  and  any  whole  multiple
               thereof;

          -    the portion of the principal  amount of the debt  securities that
               is payable on the declaration of acceleration of the maturity, if
               other than their principal  amount;  these debt securities  could
               include  original  issue  discount,  or OID,  debt  securities or
               indexed debt securities, which are each described below;

          -    whether  and  under  what  circumstances  we will pay  additional
               amounts under any debt  securities  held by a person who is not a
               U.S. person for tax payments,  assessments or other  governmental
               charges and whether we have the

                                        5

<PAGE>



               option to redeem the debt  securities  which are  affected by the
               additional amounts instead of paying the additional amounts;

          -    the form in  which we will  issue  the debt  securities,  whether
               registered,  bearer or both, and any restrictions on the exchange
               of one form of debt securities for another and on the offer, sale
               and delivery of the debt securities in either form;

          -    whether   the  debt   securities   will  be  issuable  as  global
               securities;

          -    whether the amounts of payments of principal of, premium, if any,
               and interest, if any, on the debt securities are to be determined
               with reference to an index,  formula or other method,  and if so,
               the manner in which such amounts will be determined;

          -    if the debt  securities are issuable in definitive  form upon the
               satisfaction  of certain  conditions,  the form and terms of such
               conditions;

          -    any  trustees,   paying  agents,  transfer  agents,   registrars,
               depositories   or  similar   agents  with  respect  to  the  debt
               securities;

          -    any  additions or  deletions to the terms of the debt  securities
               with respect to the events of default or covenants  governing the
               debt securities;

          -    the foreign  currency or units of two or more foreign  currencies
               in which  payment of the principal of and premium and interest on
               any debt securities will be made, if other than U.S. dollars, and
               the  holders'  right,  if any,  to  elect  payment  in a  foreign
               currency  or foreign  currency  unit other than that in which the
               debt securities are payable;

          -    whether  and to what  extent the debt  securities  are subject to
               defeasance  on  terms   different  from  those   described  under
               "Defeasance of indenture;" and

          -    any other terms of the debt securities that are not  inconsistent
               with the indenture.

(section 301)

       We may issue debt securities as OID debt securities.  OID debt securities
bear no  interest  or bear  interest  at  below-market  rates  and are sold at a
discount below their stated principal  amount.  If we issue OID debt securities,
the prospectus  supplement or term sheet will contain the issue price,  the rate
at which  interest  will  accrete,  and the date from which such  interest  will
accrete on the OID debt securities.

       We may also issue indexed debt securities.  Payments of principal of, and
premium and interest on, indexed debt  securities are determined  with reference
to the rate of exchange  between the currency or currency unit in which the debt
security is denominated and any other currency or currency unit specified by us,
to the relationship between two or more currencies or currency units or by other
similar  methods or formulas  specified  in the  prospectus  supplement  or term
sheet.

RANKING

       The debt securities will be our unsecured and unsubordinated  obligations
and will rank equally with all our other unsecured and unsubordinated debt.

FORM AND DENOMINATION

       The prospectus  supplement or term sheet will describe the form which the
debt securities will have, including  insertions,  omissions,  substitutions and
other  variations  permitted by the  indenture  and any legends  required by any
laws, rules or regulations. (section 201)

       We will  issue  debt  securities  in  denominations  of $1,000  and whole
multiples  thereof,  unless  the  prospectus  supplement  or term  sheet  states
otherwise. (section 302)

                                        6

<PAGE>



PAYMENT

       We will pay principal of and premium and interest on its registered  debt
securities at the place and time described in the debt  securities.  We will pay
installments  of interest on any registered debt security to the person in whose
name the registered  debt security is registered at the close of business on the
regular  record date for these  payments.  We will pay  principal and premium on
registered  debt  securities  only against  surrender of these debt  securities.
(section  1001) If we issue  debt  securities  in bearer  form,  the  prospectus
supplement or term sheet will describe where and how payment will be made.

MATERIAL COVENANTS

           The indenture includes the following material covenants:

           LIEN ON ASSETS

           If we or any of our Gas  Utility  Subsidiaries  mortgage,  pledge  or
otherwise subject to any lien the whole or any part of any Property which we now
own or acquire in the  future,  then we will secure the debt  securities  to the
same extent and in the same  proportion as the debt or other  obligation that is
secured by each of those mortgages,  pledges or other liens. The debt securities
will remain secured for the same period as the other debt remains secured.  This
restriction does not apply, however, to any of the following:

          -    purchase-money mortgages or liens;

          -    liens on any  property or asset that  existed at the time when we
               acquired that property or asset;

          -    any deposit or pledge to secure  public or statutory  obligations
               or contractual obligations to Long Island Power Authority;

          -    any deposit or pledge with any  governmental  agency  required in
               order to qualify us to conduct our  business,  or any part of our
               business,  or to  entitle  us to  maintain  self-insurance  or to
               obtain  the   benefits   of  any  law   relating   to   workmen's
               compensation,  unemployment insurance,  old age pensions or other
               social security;  - any deposit or pledge with any court,  board,
               commission  or  governmental  agency as  security  related to the
               proper conduct of any proceeding before it;

          -    any  mortgage,  pledge or lien on any property or asset of any of
               our affiliates other than Gas Utility  Subsidiaries,  even if the
               affiliate  may have  acquired that property or asset from us or a
               Gas Utility Subsidiary;

          -    any lien granted over receivables or other monetary or regulatory
               assets granted in connection  with a  securitization  arrangement
               for  those  assets  to  secure  our or one  of  our  Gas  Utility
               Subsidiaries'  monetary  or  regulatory  obligations  incurred in
               relation  to  such  securitization  arrangements,  so long as the
               principal  amount  of  those  obligations  does  not  exceed  the
               aggregate face amount of such receivables or monetary assets;

          -    liens for taxes,  assessments or  governmental  charges or levies
               not yet delinquent or being  contested in good faith by us, if we
               have made appropriate reserves;

          -    liens  of  landlords  and  liens  of  mechanics  and  materialmen
               incurred in the ordinary  course of business for sums not yet due
               or  being  contested  in  good  faith  by  us,  if we  have  made
               appropriate reserves;

          -    leases  or  subleases  which we have  granted  to  others  in the
               ordinary course of business;

          -    easements,   rights-of-way,   restrictions   and  other   similar
               encumbrances  which we have  incurred in the  ordinary  course of
               business and which do not interfere with the ordinary  conduct of
               our business;

          -    liens  incurred in  connection  with the issuance by a state or a
               political  subdivision  of a state of any securities the interest
               on which is exempt from federal income taxes under Section 103 of
               the  Internal  Revenue Code or any other laws or  regulations  in
               effect at the time of the issuance; or

                                        7

<PAGE>



          -    liens for the sole  purpose of  extending,  renewing or replacing
               all or a part of the indebtedness secured by any lien referred to
               in the foregoing clauses or in this clause.

           Notwithstanding  the foregoing,  we and our Gas Utility  Subsidiaries
may create, incur or permit to exist any lien to secure Indebtedness in addition
to those permitted by the preceding sentence,  and renew, extend or replace such
liens,  PROVIDED  that  at the  time  of  such  creation,  incurrence,  renewal,
extension or replacement,  after giving effect thereto,  the aggregate amount of
all such  Indebtedness of our company and our Gas Utility  Subsidiaries  and the
aggregate  Attributable  Value of all Sales and  Leaseback  Transactions  of our
company and our Gas Utility  Subsidiaries at any one time  outstanding  together
shall not exceed  10% of  Consolidated  Tangible  Assets.  As of June 30,  2000,
Consolidated Tangible Assets were $7.1 billion. (section 1007).

           SALE AND LEASEBACK TRANSACTIONS

           Neither we nor any of our Gas Utility Subsidiaries may enter into any
Sale and Leaseback unless either:

           (1)       we and our  Gas  Utility  Subsidiaries  would  be  entitled
                     pursuant  to the  "--Liens  on assets"  covenant  to create
                     Indebtedness secured by a lien on the Principal Property to
                     be leased back in an amount equal to the Attributable Value
                     of such Sale and  Leaseback  Transaction  without  the debt
                     securities  being equally and ratably  secured with (or, at
                     our option, prior to) that Indebtedness; or

           (2)       we or the  relevant  subsidiary,  within 270 days after the
                     sale or transfer  of the  relevant  assets  shall have been
                     made,  applies, in the case of a sale or transfer for cash,
                     an amount  equal to the net  proceeds  from the sale or, in
                     the case of a sale or transfer  otherwise than for cash, an
                     amount  equal to the  fair  market  value of the  Principal
                     Property so leased (as  determined  by any two directors of
                     our company or the relevant Gas Utility Subsidiary) to:

                    -    the retirement of  Indebtedness  of our company ranking
                         prior  to or on a  parity  with  the  debt  securities,
                         incurred   or  assumed  by  us  or  that  Gas   Utility
                         Subsidiary  which  by  its  terms  matures  at,  or  is
                         extendible  or  renewable  at the option of the obligor
                         to, a date more than  twelve  months  after the date of
                         incurring,  assuming or guaranteeing  such Indebtedness
                         or

                    -    the  investment in any  Principal  Property used in the
                         ordinary course of business.

                     (section 1008)

           LIMITATION ON MERGER, CONSOLIDATION AND SALES OF ASSETS

           We may not  consolidate  with or  merge  into  any  other  entity  or
transfer or lease  substantially  all of our properties and assets to any person
unless:

                    -    the successor is organized under the laws of the United
                         States or a state thereof;

                    -    the  successor  assumes by  supplemental  indenture the
                         obligations  of  its  predecessor  (that  is,  all  our
                         obligations   under   the  debt   securities   and  the
                         indenture); and

                    -    after  giving  effect to the  transaction,  there is no
                         default under the indenture.

                    The surviving  transferee or lessee  corporation will be our
               successor,  and we will be relieved of all obligations  under the
               debt securities and the indenture. (sections 801 and 802)

           DEFINED TERMS

           "Attributable Value" means, as to any particular lease under which we
or any of our Gas  Utility  Subsidiaries  is at any time liable as lessee and at
any date as of which  the  amount  thereof  is to be  determined,  the total net
obligations of the lessee for rental  payments  during the remaining term of the
lease  (including  any period for which such lease has been  extended or may, at
the option of the lessor, be extended)  discounted from the respective due dates
thereof to such date at a

                                        8

<PAGE>



rate per annum  equivalent  to the  interest  rate  inherent  in such  lease (as
determined in good faith by us in accordance with generally  accepted  financial
practice) compounded semi-annually.

           "Capital  Stock" of any Person  means  shares,  interests,  rights to
purchase, warrants, options,  participation or other equivalents of or interests
in (however designed) equity of such Person,  including any preferred stock, but
excluding any debt securities convertible into such equity.

           "Consolidated   Tangible  Assets"  means,  as  of  the  date  of  any
determination  thererof,  the  total  of all  assets  which  would  appear  on a
consolidated  balance  sheet of our  company and our  subsidiaries,  prepared in
accordance with U.S. generally accepted  accounting  principles or U.S. GAAP, at
their net book values  (after  deducting  related  depreciation,  depletion  and
amortization  which,  in  accordance  with  U.S.  GAAP,  should  be set aside in
connection with the business  conducted),  but excluding goodwill,  trade names,
trademarks,  patents,  unamortized debt discount and all other intangible assets
all as determined in accordance with U.S. GAAP.

           "Gas Utility  Subsidiaries"  means the following  subsidiaries of our
Company  engaged  in the  distribution  and sale at retail of natural  gas:  The
Brooklyn Union Gas Company d/b/a KeySpan Energy  Delivery New York,  KeySpan Gas
East Corporation d/b/a KeySpan Energy Delivery Long Island,  Boston Gas Company,
Colonial Gas Company,  Essex Gas Company, and EnergyNorth Natural Gas, Inc.; and
any other  subsidiary  of our Company  engaged in such  activity,  provided such
subsidiary would be, at any particular  time, a "significant  subsidiary" of the
Company  within the meaning of Rule 1-02 of Regulation  S-X  promulgated  by the
Commission.

           "Indebtedness"   means,   with   respect  to  any   Person   (without
duplication):

                    (1)  any liability of that Person:

                    -    for   borrowed   money  or  under   any   reimbursement
                         obligation  relating  to a letter of credit or  similar
                         instrument;

                    -    evidenced  by  a  bond,  note,   debenture  or  similar
                         instrument;

                    -    to pay the  deferred  purchase  price  of  property  or
                         services,  except trade accounts payable arising in the
                         ordinary course of business; or

                    -    for the payment of money  relating  to any  obligations
                         under any capital  lease of real or  personal  property
                         which  has  been  recorded  as  a   capitalized   lease
                         obligation.

                     (2) any  liability  of others  described  in the  preceding
           clause (1) that the Person has  guaranteed  or that is otherwise  its
           legal  liability  or  which  is  secured  by a lien on that  Person's
           Property;

                    (3)  any  amendment,  supplement,   modification,  deferral,
               renewal,  extension or  refunding  of any  liability of the types
               referred to in clauses (1) or (2) above; and

                     (4) in the case of any of our  subsidiaries,  the aggregate
           preference   in  respect  of  amounts   payable  on  the  issued  and
           outstanding  shares of preferred  stock of any such subsidiary in the
           event of any voluntary or  involuntary  liquidation,  dissolution  or
           winding up (excluding any such preference attributable to such shares
           of  preferred  stock  that  are  owned by such  Person  or any of its
           subsidiaries).

           "Person"  means  any  individual,  firm,  corporation,   partnership,
association,   joint  venture,   tribunal,  limited  liability  company,  trust,
government or political subdivision or agency or instrumentality thereof, or any
other entity or organization.

           "Principal  Property"  means the real  estate,  fixtures,  pipelines,
mains, meters,  pipes,  valves,  compressors and other related personal property
primarily used in connection  with the  transportation,  distribution  or retail
sale of gas by the Gas Utility Subsidiaries.


                                        9

<PAGE>



           "Property" means any asset, revenue or any other property,  including
capital  stock,  whether  tangible or intangible,  real or personal,  including,
without limitation, any right to receive income.

           "Sale and Leaseback  Transaction"  means any transaction or series of
related  transactions  relating to  Principal  Property  now owned or  hereafter
acquired  whereby  we or one of  our  Gas  Utility  Subsidiaries  transfers  the
Principal  Property  to a Person and we or one of our Gas  Utility  Subsidiaries
leases it from that Person for a period,  including renewals, in excess of three
years.

           "Significant  Subsidiary" has the meaning  specified , as of the date
of the  indenture,  in Rule  1-02  of  Regulation  S- X  promulgated  under  the
Securities Act.

REGISTRATION OF TRANSFER AND EXCHANGE

           All debt  securities  issued  upon any  registration  of  transfer or
exchange of debt  securities will be valid  obligations of ours,  evidencing the
same  debt and  entitled  to the same  rights  under the  indenture  as the debt
securities surrendered in the registration of transfer or exchange.

REGISTRATION OF TRANSFER

          Holders of registered debt securities may present their securities for
     registration  of transfer at the office of one or more security  registrars
     designated and maintained by us. (section 305)

          We will not be required to register the  transfer of or exchange  debt
     securities under the following conditions:

     -    We will not be required to register  the  transfer of or exchange  any
          debt  securities  during a period of 15 days before any  selection  of
          those debt securities to be redeemed.

     -    We will not be required to register  the  transfer of or exchange  any
          debt securities  selected for redemption,  in whole or in part, except
          the unredeemed portion of any debt securities being redeemed in part.

     -    We will not be required to register the  transfer of or exchange  debt
          securities  of any holder who has  exercised  an option to require the
          repurchase  of those debt  securities  prior to their stated  maturity
          date, except the portion not being repurchased.

(section 305)

EXCHANGE

           At your option,  you may exchange your  registered debt securities of
any series (except a global security, as set forth below) for an equal principal
amount of other registered debt securities of the same series having  authorized
denominations upon surrender to our designated agent.

           We may at any time  exchange  debt  securities  issued as one or more
global  securities for an equal principal  amount of debt securities of the same
series  in  definitive  registered  form.  In this case we will  deliver  to the
holders new debt securities in definitive  registered form in the same aggregate
principal amount as the global securities being exchanged.

           The  depositary of the global  securities may also decide at any time
to surrender one or more global  securities  in exchange for debt  securities of
the same series in definitive registered form, in which case we will deliver the
new  debt  securities  in  definitive  form  to  the  persons  specified  by the
depositary, in an aggregate principal amount equal to, and in exchange for, each
person's beneficial interest in the global securities. (section 305)

           Notwithstanding  the above,  we will not be required to exchange  any
debt  securities  if,  as a result  of the  exchange,  we would  suffer  adverse
consequences under any United States law or regulation. (section 305)


                                       10

<PAGE>



GLOBAL SECURITIES

           If we  decide  to issue  debt  securities  in the form of one or more
global  securities,  then we will register the global  securities in the name of
the  depositary  for the global  securities or the nominee of the depositary and
the global  securities  will be delivered by the trustee to the  depositary  for
credit to the  accounts  of the  holders  of  beneficial  interests  in the debt
securities.

           The  prospectus  supplement  or term sheet will describe the specific
terms of the  depositary  arrangement  for debt  securities of a series that are
issued in global form. None of our company, the trustee, any paying agent or the
security  registrar will have any  responsibility or liability for any aspect of
the  records  relating to or payments  made on account of  beneficial  ownership
interests in a global debt security or for maintaining, supervising or reviewing
any records relating to these beneficial ownership interests.

DEFEASANCE OF INDENTURE

           We can terminate  all of our  obligations  under the  indenture  with
respect to the debt securities, other than the obligation to pay interest on and
the principal of the debt securities and certain other obligations,  at any time
by:

     -    depositing money or U.S. government obligations with the trustee in an
          amount  sufficient  to pay the  principal  of and interest on the debt
          securities to their maturity; and

     -    complying  with certain other  conditions,  including  delivery to the
          trustee of an opinion  of counsel to the effect  that  holders of debt
          securities will not recognize income,  gain or loss for federal income
          tax purposes as a result of our defeasance.

           In  addition,  we can  terminate  all of our  obligations  under  the
indenture with respect to the debt  securities,  including the obligation to pay
interest on and the principal of the debt securities, at any time by:

     -    depositing money or U.S. government obligations with the trustee in an
          amount  sufficient  to pay the  principal  of and interest on the debt
          securities to their maturity, and

     -    complying  with certain other  conditions,  including  delivery to the
          trustee of an opinion of counsel  stating that there has been a ruling
          by the Internal  Revenue  Service,  or a change in the federal tax law
          since the date of the  indenture,  to the effect that  holders of debt
          securities will not recognize income,  gain or loss for federal income
          tax purposes as a result of our defeasance.

(sections 402-404)

PAYMENTS OF UNCLAIMED MONEYS

           Moneys deposited with the trustee or any paying agent for the payment
of principal of or premium and interest on any debenture that remains  unclaimed
for two years  will be  repaid to us at our  request,  unless  the law  requires
otherwise.  If this happens and you want to claim these moneys, you must look to
us and not to the trustee or paying agent. (section 409)

EVENTS OF DEFAULT, NOTICES, AND WAIVER

           EVENTS OF DEFAULT

           An "event of default"  regarding any series of debt securities is any
one of the following events:

          - default for 30 days in the payment of any interest  installment when
     due and payable;

          - default in the  payment  of  principal  or  premium  when due at its
     stated maturity, by declaration, when called for redemption or otherwise;


                                       11

<PAGE>



-          default in the  performance of any covenant in the debt securities or
           in the  indenture by us for 60 days after notice to us by the trustee
           or by  holders of 25% in  principal  amount of the  outstanding  debt
           securities of that series;

-          acceleration  of debt  securities  of  another  series  or any  other
           indebtedness  of  ours  or one of our  Significant  Subsidiaries  for
           borrowed  money,  in an  aggregate  principal  amount  exceeding  $25
           million under the terms of the instrument or instruments  under which
           the  indebtedness  is issued or secured,  if the  acceleration is not
           annulled  within 30 days  after  written  notice as  provided  in the
           indenture;

     -    a final,  non-appealable judgment or order for the payment of money in
          excess of $25 million  rendered  against us or one of our  Significant
          Subsidiaries  that is not paid or discharged  within 60 days following
          entry of such judgment or order;

     -    certain events of bankruptcy,  insolvency and reorganization involving
          us; and

     -    any other  event of default of that series  that is  specified  in the
          prospectus supplement or term sheet.

(section 501)

           A  default  regarding  a single  series of debt  securities  will not
necessarily constitute a default regarding any other series.

           If an event of default for any series of debt  securities  occurs and
is  continuing  (other  than an  event  of  default  involving  the  bankruptcy,
insolvency or reorganization of our company),  either the trustee or the holders
of 25% in principal amount of the outstanding debt securities of that series may
declare  the  principal  (or, in the case of (a) OID debt  securities,  a lesser
amount as provided in those OID debt securities or (b) indexed debt  securities,
an amount determined by the terms of those indexed debt securities),  of all the
debt securities of that series,  together with any accrued  interest on the debt
securities,  to be immediately due and payable by notice in writing to us. If it
is the  holders  of debt  securities  who give  notice  of that  declaration  of
acceleration  to us,  then they must also give notice to the  trustee.  (section
502)

           If  an  event  of  default  occurs  which  involves  the  bankruptcy,
insolvency or reorganization of our company, as set forth above, then all unpaid
principal amounts (or, if the debt securities are (a) OID debt securities,  then
the  portion  of the  principal  amount  that is  specified  in  those  OID debt
securities or (b) indexed debt securities,  an amount determined by the terms of
those indexed debt  securities)  and accrued  interest on all debt securities of
each series will immediately  become due and payable,  without any action by the
trustee or any holder of debt securities. (section 502)

           In order for holders of debt securities to initiate proceedings for a
remedy under the indenture, 25% in principal amount must first give notice to us
as provided  above,  must request that the trustee  initiate a proceeding in its
own name and must offer the trustee a  reasonable  indemnity  against  costs and
liabilities.  If  the  trustee  still  refuses  for  60  days  to  initiate  the
proceeding,  and no  inconsistent  direction  has been  given to the  trustee by
holders of a majority of the debt securities of the same series, the holders may
initiate a proceeding as long as they do not adversely  affect the rights of any
other holders of that series. (section 507)

           The holders of a majority in principal amount of the outstanding debt
securities of a series may rescind a declaration of  acceleration  if all events
of default,  besides the failure to pay principal or interest due solely because
of the declaration of acceleration, have been cured or waived. (section 502)

           If we default on the payment of any  installment of interest and fail
to cure the default within 30 days, or if we default on the payment of principal
when it becomes  due,  then the trustee may require us to pay all amounts due to
the trustee,  with interest on the overdue  principal or interest  payments,  in
addition to the expenses of collection. (section 503)

           A  judgment  for  money  damages  by  courts  in the  United  States,
including  a money  judgment  based  on an  obligation  expressed  in a  foreign
currency,  will ordinarily be rendered only in U.S. dollars.  New York statutory
law  provides  that a court  shall  render a judgment  or decree in the  foreign
currency of the  underlying  obligation and that the judgment or decree shall be
converted into U.S. dollars at the exchange rate prevailing on the date of entry
of the judgment or decree.  The indenture  requires us to pay additional amounts
necessary to protect  holders if a court  requires a conversion  to be made on a
date other than a judgment date.

                                       12

<PAGE>



           NOTICES

           The trustee is required to give notice to holders of a series of debt
securities of a default,  which remains uncured or has not been waived,  that is
known to the trustee within 90 days after the default has occurred. In the event
of a default in the  performance  of any covenant in the debt  securities or the
indenture which results under the indenture in notice to us by the trustee after
90 days,  the trustee  shall not give  notice to the holders of debt  securities
until 60 days after the giving of notice to us. The trustee may not withhold the
notice in the case of a default in the  payment of  principal  of and premium or
interest on any of the debt securities. (section 602)

           WAIVER

           The holders of a majority in principal amount of the outstanding debt
securities  of a series may waive any past default or event of default  except a
default in the  payment of  principal  of or  premium  or  interest  on the debt
securities  of that series or a default  relating to a provision  that cannot be
amended without the consent of each affected holder. (section 513)

REPORTS

           We are  required to file an  officer's  certificate  with the trustee
every year confirming that we are complying with all conditions and covenants in
the indenture. (section 1005)

           We must also file with the trustee  copies of our annual  reports and
the  information  and other  documents which we may be required to file with the
SEC under Section 13 or Section 15(d) of the Securities Exchange Act of 1934, as
amended.  These  documents  must be filed with the trustee  within 15 days after
they are  required to be filed with the SEC. If we are not  required to file the
information,  documents or reports under either of these Sections,  then we must
file with the trustee and the SEC, in accordance  with the rules and regulations
of the SEC, the  supplementary and periodic  information,  documents and reports
which may be  required by Section 13 of the  Exchange  Act, in respect of a debt
security  listed and  registered on a national  securities  exchange,  as may be
required by the rules and regulations of the SEC.

           Within  30 days of  filing  the  information,  documents  or  reports
referred  to above  with the  trustee,  we must mail to the  holders of the debt
securities  any  summaries of the  information,  documents or reports  which are
required  to be sent to the  holders  by the rules and  regulations  of the SEC.
(section 704)

RIGHTS AND DUTIES OF THE TRUSTEE

           The holders of a majority in  principal  amount of  outstanding  debt
securities of any series may direct the time, method and place of conducting any
proceeding  for any remedy  available to the trustee or exercising  any trust or
other power  conferred  on the  trustee.  The trustee may decline to follow that
direction  if it would  involve the trustee in  personal  liability  or would be
illegal. (section 512) During a default, the trustee is required to exercise the
standard  of care  and  skill  that a  prudent  man  would  exercise  under  the
circumstances  in the conduct of his own affairs.  (section  601) The trustee is
not obligated to exercise any of its rights or powers under the indenture at the
request or  direction  of any of the  holders of debt  securities  unless  those
holders have offered to the trustee reasonable  security or indemnity.  (section
603)

          The trustee is entitled,  in the absence of bad faith on its part,  to
     rely on an officer's  certificate before taking action under the indenture.
     (section 603)

SUPPLEMENTAL INDENTURES

           SUPPLEMENTAL INDENTURES NOT REQUIRING CONSENT OF HOLDERS

           Without  the consent of any  holders of debt  securities,  we and the
trustee may supplement the indenture, among other things, to:

     -    pledge property to the trustee as security for the debt securities;


                                       13

<PAGE>



     -    reflect that another entity has succeeded us and assumed the covenants
          and obligations of us under the debt securities and the indenture;

     -    cure any  ambiguity or  inconsistency  in the indenture or in the debt
          securities or make any other  provisions  necessary or  desirable,  as
          long as the  interests of the holders of the debt  securities  are not
          adversely affected in any material respect;

     -    issue  and  establish  the  form  and  terms  of any  series  of  debt
          securities as provided in the indenture;

     -    add to our covenants  further covenants for the benefit of the holders
          of debt  securities  (and if the covenants are for the benefit of less
          than all series of debt securities,  stating which series are entitled
          to benefit);

     -    add any  additional  event of default (and if the new event of default
          applies to fewer than all series of debt securities,  stating to which
          series it applies);

     -    change the trustee or provide for an additional trustee;

     -    provide  additional  provisions for bearer debt  securities so long as
          the action does not  adversely  affect the interests of holders of any
          debt securities in any material respect; or

     -    modify the indenture in order to continue its qualification  under the
          Trust  Indenture  Act of 1939 or as may be  necessary  or desirable in
          accordance with amendments to that Act.

(section 901)

           SUPPLEMENTAL INDENTURES REQUIRING CONSENT OF HOLDERS

           With the consent of the  holders of at least a majority in  principal
amount  of the  series  of the  debt  securities  that  would be  affected  by a
modification  of the  indenture,  the  indenture  permits us and the  trustee to
supplement  the indenture or modify in any way the terms of the indenture or the
rights of the holders of the debt  securities.  However,  without the consent of
each holder of all of the debt securities affected by that modification,  we and
the trustee may not:

     -    reduce the  principal  of or  premium  on or change  the stated  final
          maturity of any debt security;

     -    reduce the rate of or change the time for  payment of  interest on any
          debt security (or, in the case of OID debt securities, reduce the rate
          of accretion of the OID);

     -    change any of our  obligations  to pay  additional  amounts  under the
          indenture;

     -    reduce or alter the method of  computation  of any amount payable upon
          redemption,  repayment or purchase of any debt  security by us (or the
          time when the redemption, repayment or purchase may be made);

     -    make the  principal  or  interest  on any debt  security  payable in a
          currency  other than that  stated in the debt  security  or change the
          place of payment;

     -    reduce  the  amount  of  principal  due on an OID debt  security  upon
          acceleration  of  maturity or  provable  in  bankruptcy  or reduce the
          amount  payable  under  the terms of an  indexed  debt  security  upon
          acceleration of maturity or provable in bankruptcy;

     -    impair any right of  repayment or purchase at the option of any holder
          of debt securities;

     -    modify  the right of any holder of debt  securities  to receive or sue
          for payment of the principal or interest on a debt security that would
          be due and payable at the maturity thereof or upon redemption; or

     -    reduce the principal  amount of the outstanding debt securities of any
          series  required to  supplement  the  indenture or to waive any of its
          provisions.

                                       14

<PAGE>




(section 902)

           A  supplemental  indenture  which  modifies or eliminates a provision
intended to benefit the holders of one series of debt securities will not affect
the rights under the indenture of holders of other series of debt securities.

REDEMPTION

           The specific terms of any  redemption of a series of debt  securities
will be contained in the  prospectus  supplement  or term sheet for that series.
Generally, we must send notice of redemption to the holders at least 30 days but
not more than 60 days prior to the redemption date. The notice will specify:

     -    the principal amount being redeemed;

     -    the redemption date;

     -    the redemption price;

     -    the place or places of payment;

     -    the CUSIP number of the debt securities being redeemed;

     -    whether the redemption is pursuant to a sinking fund;

     -    that on the  redemption  date,  interest  (or, in the case of OID debt
          securities, original issue discount) will cease to accrue; and

     -    if bearer debt securities are being  redeemed,  that those bearer debt
          securities  must be  accompanied  by all  coupons  maturing  after the
          redemption  date or the amount of the missing coupons will be deducted
          from the redemption price, or indemnity must be furnished, and whether
          those bearer debt  securities  may be exchanged  for  registered  debt
          securities not being redeemed.

(section 1104)

           On or before any redemption  date, we will deposit an amount of money
with the trustee or with a paying agent sufficient to pay the redemption  price.
(section 1103)

           If less than all the debt securities are being redeemed,  the trustee
shall  select the debt  securities  to be redeemed  using a method it  considers
fair. (section 1103) After the redemption date, holders of debt securities which
were redeemed will have no rights with respect to the debt securities except the
right to receive the redemption  price and any unpaid interest to the redemption
date. (section 1106)


CONCERNING THE TRUSTEE

           We have customary banking  relationships with the trustee,  The Chase
Manhattan Bank. Among other services,  The Chase Manhattan Bank provides us with
cash management and credit services, including payroll account, lockbox, foreign
exchange and investment custody account services.  The Chase Manhattan Bank also
serves or has served as  administrative  agent and trustee with respect to other
issuances of debt by us and our  subsidiaries  and is a member of a syndicate of
banks which is party to several credit  facilities  with us in a total amount of
$2 billion.  In  addition,  Chase  Securities  Inc.,  an  affiliate of The Chase
Manhattan Bank, acts as a placement agent for our commercial paper program.



                                       15

<PAGE>



GOVERNING LAW

          The laws of the State of New York govern the indenture and will govern
     the debt securities. (section 112)


        CERTAIN U.S. FEDERAL INCOME TAX CONSEQUENCES TO NON-U.S. PERSONS

          The  following  is a  summary  of  certain  U.S.  federal  income  tax
     considerations  for  beneficial  owners  of the  debt  securities  that are
     "non-U.S.  persons"  under the Internal  Revenue Code of 1986,  as amended.
     Under the Internal Revenue Code, a "non-U.S. person" means a person that is
     not any of the following:

     -    a citizen or resident of the United States;

     -    a corporation or partnership created or organized in or under the laws
          of the United States or any political subdivision thereof;

     -    an  estate  the  income of which is  subject  to U.S.  federal  income
          taxation regardless of its source; or

     -    a trust which is either  subject to the  supervision of a court within
          the United States and the control of one or more U.S. persons or has a
          valid election in effect under applicable U.S. Treasury regulations to
          be treated as a U.S. person.

      This  summary is based on current law which is subject to change  (perhaps
retroactively),  is for general  purposes only and should not be considered  tax
advice.  This summary does not represent a detailed  description  of the federal
income tax  consequences  to you in light of your particular  circumstances.  In
addition,  it does not  represent  a detailed  description  of the U.S.  federal
income  tax  consequences  applicable  to you  if you  are  subject  to  special
treatment  under  the  U.S.  federal  income  tax laws  (including  if you are a
"controlled  foreign  corporation,"  "passive  foreign  investment  company"  or
"foreign personal holding  company").  We cannot assure you that a change in law
will not alter  significantly  the tax  considerations  that we describe in this
summary.

      YOU SHOULD CONSULT YOUR OWN TAX ADVISOR  CONCERNING  THE  PARTICULAR  U.S.
FEDERAL INCOME TAX  CONSEQUENCES TO YOU OF THE OWNERSHIP OF THE DEBT SECURITIES,
AS WELL AS THE  CONSEQUENCES  TO YOU ARISING  UNDER THE LAWS OF ANY OTHER TAXING
JURISDICTION.


U.S. FEDERAL WITHHOLDING TAX

      The 30% U.S.  federal  withholding  tax will not apply to any  payment  of
principal or interest (including original issue discount) on a particular series
of debt securities provided that:

     -    you do not actually (or  constructively)  own 10% or more of the total
          combined  voting  power of all classes of our voting  stock within the
          meaning  of  the  Internal   Revenue   Code  and  the  U.S.   Treasury
          Regulations;

     -    you are not a  controlled  foreign  corporation  that is related to us
          through stock ownership;

     -    you are not a bank whose receipt of interest on the debt securities is
          described in the Internal Revenue Code; and

     -    (a) you provide your name and address on an IRS Form W-8, and certify,
          under  penalty  of  perjury,  that you are not a U.S.  person or (b) a
          financial  institution  holding  the debt  securities  on your  behalf
          certifies,  under penalty of perjury, that it has received an IRS Form
          W-8 from the beneficial owner and provides us with a copy.

      If you cannot  satisfy  the  requirements  described  above,  payments  of
premium,  and interest  (including  original issue discount) made to you will be
subject to the 30% U.S.  federal  withholding  tax, unless you provide us with a
properly executed:

     -    IRS Form 1001 or successor form claiming an exemption from withholding
          under the benefit of a tax treaty or

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     -    IRS Form 4224 or successor form stating that interest paid on the debt
          security is not subject to  withholding  tax because it is effectively
          connected  with your  conduct  of a trade or  business  in the  United
          States.

      Under new Treasury  regulations  applicable to payment made after December
31, 2000,  revised Form W-8s will  generally  replace IRS Form 1001 and IRS Form
4224. The 30% U.S. federal  withholding tax will not apply to any gain or income
that you realize on the sale,  exchange,  retirement or other disposition of the
debt security.

U.S. FEDERAL ESTATE TAX

      Your  estate  will  not be  subject  to U.S.  federal  estate  tax on debt
securities  of a series  beneficially  owned  by you at the time of your  death,
provided that:

     -    you do not own 10% or more of the total  combined  voting power of all
          classes of our  voting  stock  (within  the  meaning  of the  Internal
          Revenue Code and the U.S. Treasury Regulations) and

     -    interest on that debt security would not have been, if received at the
          time of your death, effectively connected with the conduct by you of a
          trade or business in the United States.

U.S. FEDERAL INCOME TAX

      If you are  engaged  in a trade  or  business  in the  United  States  and
interest on the debt  securities is  effectively  connected  with the conduct of
that trade or business  (although exempt from the 30% withholding tax), you will
be subject to U.S.  federal income tax on that interest on a net income basis in
the same  manner as if you were a U.S.  person  as  defined  under the  Internal
Revenue Code. In addition, if you are a foreign corporation,  you may be subject
to a branch profits tax equal to 30% (or lower  applicable  treaty rate) of your
earnings  and profits  for the taxable  year,  subject to  adjustments  that are
effectively  connected  with the  conduct by you of a trade or  business  in the
United States. For this purpose, interest on debt securities will be included in
earnings and profits.

      Any  gain  or  income  realized  on the  disposition  of a  debt  security
generally will not be subject to U.S. federal income tax unless:

     -    that gain or income is  effectively  connected  with the  conduct of a
          trade or business in the United States by you, or

     -    you are an individual who is present in the United States for 183 days
          or more in the taxable  year of that  disposition,  and certain  other
          conditions are met.

      INFORMATION REPORTING AND BACKUP WITHHOLDING

      In general, you will not be required to provide information  reporting and
backup  withholding  regarding  payments that we make to you provided that we do
not have actual  knowledge that you are a U.S.  person and we have received from
you the statement described above under "U.S. Federal Withholding Tax."

      In  addition,  you will not be  required  to pay  backup  withholding  and
provide  information  reporting  regarding  the  proceeds  of the sale of a debt
security  within the United  States or conducted  through  certain  U.S.-related
financial  intermediaries,  if the payor receives the statement  described above
and does not have actual knowledge that you are a U.S. person,  as defined under
the Internal Revenue Code, or you otherwise establish an exemption.

      U.S.  Treasury  Regulations were recently issued that generally modify the
information  reporting  and  backup  withholding  rules  applicable  to  certain
payments  made after  December  31,  2000.  In  general,  the new U.S.  Treasury
Regulations  would not  significantly  alter the present rules discussed  above,
except in certain special situations.

      Any amounts withheld under the backup withholding rules will be allowed as
a refund or a credit against your U.S. federal income tax liability provided the
required information is furnished to the IRS.



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                              PLAN OF DISTRIBUTION

      We may sell the debt securities as follows:

     -    through underwriters or dealers; or

     -    through agents; or

     -    directly to purchasers.

      The prospectus supplement or term sheet for each series of debt securities
will describe that offering, including:

     -    the name or names of any underwriters, dealers or agents;

     -    the purchase price and the proceeds to us from that sale;

     -    any underwriting discounts and other items constituting  underwriters'
          compensation;

     -    any initial  public  offering  price and any discounts or  concessions
          allowed or reallowed or paid to dealers; and

     -    any securities  exchanges on which the debt  securities of that series
          may be listed.

UNDERWRITERS

      Unless otherwise set forth in the prospectus supplement or term sheet, the
obligations of the  underwriters  to purchase debt securities will be subject to
certain conditions.  The underwriters will be obligated to purchase all the debt
securities of a series if any are purchased.

      The debt  securities  will be acquired by the  underwriters  for their own
account and may be resold by them from time to time in one or more transactions,
including  negotiated  transactions,  at a fixed  public  offering  price  or at
varying  prices  determined at the time of sale.  Underwriters  may be deemed to
have  received  compensation  from us in the form of  underwriting  discounts or
commissions  and may  also  receive  commissions  from  the  purchasers  of debt
securities  for whom  they may act as  agent.  Underwriters  may also  sell debt
securities to or through dealers.  These dealers may receive compensation in the
form of discounts,  concessions  or  commissions  from the  underwriters  and/or
commissions  from the  purchasers  for whom they may act as agent.  Any  initial
public  offering price and any discounts or concessions  allowed or reallowed or
paid to dealers may be changed from time to time.

      We may  authorize  underwriters  to  solicit  offers by  certain  types of
institutions  to purchase debt  securities  from us at the public offering price
stated in the prospectus  supplement or term sheet required by delayed  delivery
contracts  providing for payment and delivery on a specified date in the future.
If  we  sell  debt  securities  under  these  delayed  delivery  contracts,  the
prospectus supplement or term sheet will state that as well as the conditions to
which these  delayed  delivery  contracts  will be subject  and the  commissions
payable for that solicitation.

AGENTS

      We may also sell debt securities through agents designated by us from time
to time.  We will  name any  agents  involved  in the  offer or sale of the debt
securities  and will  list  commissions  payable  by us to these  agents  in the
prospectus  supplement  or term  sheet.  These  agents  will be acting on a best
efforts basis to solicit purchases for the period of their  appointment,  unless
we state otherwise in the prospectus supplement or term sheet.

DIRECT SALES

      We may sell debt securities directly to purchasers.  In this case, we will
not engage underwriters or agents in the offer and sale of debt securities.


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REMARKETING TRANSACTIONS

      We may also sell  debt  securities  that we have  purchased,  redeemed  or
repaid through one or more remarketing  firms acting as principals for their own
accounts or as our agents.  The applicable  prospectus  supplement or term sheet
will identify any remarketing firms and describe the terms of our agreement with
them and their compensation.  Remarketing firms may be deemed to be underwriters
of the debt securities under the Securities Act of 1933, as amended.

INDEMNIFICATION

      We may indemnify  underwriters,  dealers or agents who  participate in the
distribution  of  debt  securities   against  certain   liabilities,   including
liabilities  under the Securities Act, and agree to contribute to payments which
these underwriters, dealers or agents may be required to make.

NO ASSURANCE OF LIQUIDITY

      Each series of debt  securities  will be a new issue of securities with no
established  trading market. Any underwriters that purchase debt securities from
us may make a market in these  debt  securities.  The  underwriters  will not be
obligated,  however, to make a market in the debt securities and may discontinue
market-making  at any time  without  notice to  holders of debt  securities.  We
cannot  assure you that there will be  liquidity  in the trading  market for any
debt securities of any series.


                                 LEGAL OPINIONS

      The validity of the debt securities  offered by us in this prospectus will
be passed upon for us by Steven L. Zelkowitz,  Senior Vice President and General
Counsel of KeySpan.  Mr.  Zelkowitz is the beneficial owner of or has the option
to acquire  approximately  277,400  shares of our common  stock.  Certain  legal
matters will be passed upon for any agents or  underwriters by Simpson Thacher &
Bartlett,  New York,  New York,  or other counsel  identified in the  prospectus
supplement or term sheet. Simpson Thacher & Bartlett also acts as counsel for us
from time to time.


                                     EXPERTS

      Arthur  Andersen  LLP,  independent  accountants,  audited  the  financial
statements  for the nine months ended  December  31, 1998 and the twelve  months
ended December 31, 1999, and related schedules incorporated by reference in this
prospectus.  Arthur  Andersen  LLP, also audited the  financial  statements  for
Eastern  Enterprises  for the twelve months ended December 31, 1998 and December
31, 1999, and related  schedules  incorporated by reference in this  prospectus.
These financial statements and schedules are incorporated by reference herein in
reliance upon the authority of Arthur Andersen LLP, as experts in accounting and
auditing in giving the reports.

      Ernst & Young LLP, independent auditors, have audited the income statement
and statement of cash flows,  and the related  financial  statement  schedule of
Long Island Lighting Company for the twelve months ended March 31, 1998 included
in our Annual  Report on Form 10-K,  as  amended,  for the twelve  months  ended
December 31, 1999, as set forth in their report, which is incorporated herein by
reference.  These financial  statements and schedule are incorporated  herein by
reference in reliance upon Ernst & Young LLP's report,  given on their authority
as experts in accounting and auditing.


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