SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                  ------------


                                    Form 11-K



(Mark One)

[X]                 ANNUAL REPORT PURSUANT TO SECTION 15(d) OF
                   THE SECURITIES EXCHANGE ACT OF 1934 (NO FEE
                                    REQUIRED)

                      For the year ended December 31, 2003

                                       OR


[   ]          TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE
                SECURITIES EXCHANGE ACT OF 1934 (NO FEE REQUIRED)

             For the transition period from __________ to __________


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


                           Commission File No. 1-14161

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


                                 KeySpan Energy
                         401(k) Plan For Union Employees
                            (Full title of the Plan)


                               KeySpan Corporation
          (Name of issuer of the securities held pursuant to the Plan)

                              One MetroTech Center
                             Brooklyn, NY 11201-3385
                     (Address of principal executive office)









KeySpan Energy 401(k) Plan For Union Employees

TABLE OF CONTENTS
- -------------------------------------------------------------------------------


                                                                           Page

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM                       1

FINANCIAL STATEMENTS:

   Statements of Assets Available for Benefits
   as of December 31, 2003 and 2002                                           2

   Statement of Changes in Assets Available for Benefits
   for the Year Ended December 31, 2003                                       3

   Notes to Financial Statements                                           4-10

SUPPLEMENTAL SCHEDULE:

   Form 5500, Schedule H, Part IV, Line 4i - Schedule of Assets
   (Held at End of Year)as of December 31, 2003                              11

SIGNATURES                                                                   12

EXHIBIT INDEX:

    Independent Registered Public Accounting Firm's Consent                  13



All other schedules required by Section 2520.103-10 of the Department of Labor's
rules and regulations for reporting and disclosure under the Employee Retirement
Income  Security Act of 1974  ("ERISA"),  have been omitted because they are not
applicable.















REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM


To the Investment Review Committee of
KeySpan Corporation:

We have audited the accompanying  statements of assets available for benefits of
the KeySpan  Energy 401(k) Plan for Union  Employees (the "Plan") as of December
31, 2003 and 2002, and the related  statement of changes in assets available for
benefits for the year ended December 31, 2003.  These  financial  statements are
the responsibility of the Plan's management. Our responsibility is to express an
opinion on these financial statements based on our audits.

We conducted  our audits in  accordance  with  standards  of the Public  Company
Accounting Oversight Board (United States). Those standards require that we plan
and perform the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement.  An audit includes examining, on a
test basis,  evidence  supporting  the amounts and  disclosures in the financial
statements.  An audit also includes assessing the accounting principles used and
significant  estimates  made by  management,  as well as evaluating  the overall
financial  statement  presentation.   We  believe  that  our  audits  provide  a
reasonable basis for our opinion.

In our  opinion,  such  financial  statements  present  fairly,  in all material
respects, the assets available for benefits of the Plan at December 31, 2003 and
2002,  and the  changes  in assets  available  for  benefits  for the year ended
December 31, 2003, in conformity with accounting  principles  generally accepted
in the United States of America.

Our audits  were  conducted  for the  purpose of forming an opinion on the basic
financial statements taken as a whole. The supplemental schedule of assets (held
at end of  year)  as of  December  31,  2003 is  presented  for the  purpose  of
additional  analysis  and  is  not  a  required  part  of  the  basic  financial
statements,  but is  supplementary  information  required by the  Department  of
Labor's Rules and  Regulations  for Reporting and Disclosure  under the Employee
Retirement  Income Security Act of 1974. This schedule is the  responsibility of
the  Plan's  management.  Such  schedule  has  been  subjected  to the  auditing
procedures  applied in our audit of the basic 2003 financial  statements and, in
our  opinion,  is fairly  stated in all material  respects  when  considered  in
relation to the basic financial statements taken as a whole.





/s/ Deloitte & Touche LLP
New York, New York
June 28, 2004






KEYSPAN ENERGY 401(K) PLAN FOR UNION EMPLOYEES

STATEMENTS OF ASSETS AVAILABLE FOR BENEFITS
DECEMBER 31, 2003 AND 2002
- -------------------------------------------------------------------------------


ASSETS:                                                                  2003                       2002
                                                                                      

   Participant directed investments, at fair value               $423,601,260               $336,835,090
   Nonparticipant directed investments, at fair value              94,876,360                 80,581,813
                                                              ----------------           ----------------
                    Total Investments                             518,477,620                417,416,903
                                                              ----------------           ----------------

RECEIVABLES:
   Participants' contribution                                         471,397                    382,408
   Employers' contribution                                             46,263                     37,830
                                                              ----------------           ----------------
                    Total Receivables                                 517,660                    420,238
                                                              ----------------           ----------------

ASSETS AVAILABLE FOR BENEFITS                                    $518,995,280               $417,837,141
                                                              ================           ================




See notes to financial statements.






                                      -2-




KEYSPAN ENERGY 401(k) PLAN FOR UNION EMPLOYEES

STATEMENT OF CHANGES IN ASSETS AVAILABLE FOR BENEFITS
YEAR ENDED DECEMBER 31, 2003
- -------------------------------------------------------------------------------


                                                                                            
ADDITIONS TO ASSETS ATTRIBUTED TO:
   Net investment income:
   Net appreciation on investments                                                              $63,493,656
   Interest and dividends                                                                        14,505,595
                                                                                           -----------------
                    Net investment income                                                        77,999,251
                                                                                           -----------------

   Contributions:
   Participants                                                                                  33,734,302
   Employer                                                                                       3,296,326
   Rollovers                                                                                        458,219
                                                                                           -----------------
                    Total Contributions                                                          37,488,847
                                                                                           -----------------

                    Total Additions                                                             115,488,098

DEDUCTIONS FROM ASSETS ATTRIBUTED TO:
   Benefits paid to participants                                                               (13,511,163)
   Net assets transferred out to the Management Plan                                              (818,796)
                                                                                           -----------------
                    Total Deductions                                                           (14,329,959)
                                                                                           ----------------

INCREASE IN ASSETS                                                                              101,158,139

ASSETS AVAILABLE FOR BENEFITS:
   Beginning of Year                                                                            417,837,141
                                                                                           -----------------

   End of Year                                                                                 $518,995,280
                                                                                           =================




See notes to financial statements.






                                      -3-




KEYSPAN ENERGY 401(k) PLAN FOR UNION EMPLOYEES

NOTES TO FINANCIAL STATEMENTS
AS OF DECEMBER 31, 2003 AND 2002 AND FOR THE YEAR ENDED DECEMBER 31, 2003
- -------------------------------------------------------------------------------


1.    DESCRIPTION OF THE PLAN

     The  following  description  of the  KeySpan  Energy  401(k) Plan for Union
     Employees  (the  "Plan")   available  to  eligible   employees  of  KeySpan
     Corporation (the "Company" or "KeySpan") provides only general information.
     Participants  should  refer  to  the  Plan  Document  for a  more  complete
     description of the Plan's provisions.

     General - The Plan was approved by the  shareholders  of the Company at the
     annual meeting of  shareholders  on February 3, 1983. The Plan provides for
     eligible  employees  of the Company and its  wholly-owned  subsidiaries  to
     become  participants of the Plan. All employees are eligible to participate
     in the Plan  immediately  upon hire.  The  recordkeeper,  custodian and the
     trustee of the Plan is the Vanguard  Fiduciary Trust Company (the "Vanguard
     Group"  or  "Vanguard").  The Plan is a  defined  contribution  plan and is
     subject to Title I of the Employee  Retirement  Income Security Act of 1974
     ("ERISA").

     On September 30, 1999,  the Board of Directors of the Company  approved the
     amendment  and  restatement  of the Plan.  As a result,  the  assets of the
     participants   of  the  former  Long  Island   Lighting   Company   Capital
     Accumulation Plan for Union Employees were merged with the Plan.

     The Investment Review Committee (the  "Committee"),  at the meeting held on
     September  20,  2000,  approved  the  merger  of the  Eastern  Enterprises,
     Colonial Gas and EnergyNorth 401(k) Plans with the Plan,  effective as soon
     as practicable,  following the date of acquisition.  On April 11, 2001, the
     Committee  approved the new  Participating  Employer  List  resulting  from
     KeySpan's   holding  company  structure  and  the  acquisition  of  Eastern
     Enterprises.

     Effective  January  1, 2002,  the  Committee  approved  the  following:  1)
     increase the maximum amount that  participants can contribute in accordance
     with  Internal  Revenue  Service  ("IRS")  regulations  ($11,000  for 2002,
     increasing  by $1,000 each year until 2006);  2) increase the  contribution
     limit to 50% of  compensation,  up to the IRS maximum limit;  3) reduce the
     hardship withdrawal waiting period from 12 months to 6 months; and 4) a new
     Employee Stock  Ownership  Plan be created within the 401(k),  which allows
     participants  in the Plan to choose to reinvest their  dividends in Company
     Common Stock or to receive the dividends in cash.

     On July 2, 2002, KeySpan sold one of its subsidiaries,  Midland Enterprises
     LLC, to Ingram  Industries,  Inc.  Employees under this subsidiary were not
     eligible to participate in the Plan as of the date of the sale.

     Plan  Amendments  -  Effective  January 1,  2003,  the  Committee  approved
     catch-up contributions for employees age 50 and over.

     Effective January 1, 2003, the match for KeySpan Home Energy Services Local
     1049 changed from $0 to 1/3 of the first $30 of weekly  contributions and a
     10% discount on the purchase of Company Common Stock.



                                      -4-



     Contributions - All employees who are eligible pursuant to their collective
     bargaining  agreement  contributing  to  the  Plan  will  receive  employer
     contributions and a 10% discount on the KeySpan Common Stock Fund ("Company
     Common  Stock") on the first of the month  following  completion  of twelve
     months of  service.  Additionally,  all  eligible  employees  will  receive
     matching   contributions  in  Company  Common  Stock  regardless  of  where
     employees  choose to invest  their  contributions.  The match and  discount
     amounts may be transferred out of Company Common Stock  immediately.  There
     are no  holding  periods or  restrictions  with  respect to Company  Common
     Stock. All other contributions are participant-directed.

     All participants of the Plan may elect to have their  compensation  reduced
     by not less  than 1% and no more  than  50% (in  multiples  of 1%),  not to
     exceed the  limitation  imposed by Section  402(g) of the Internal  Revenue
     Code,  and  contributed  to the  Plan on the  participants'  behalf  by the
     Company.  Such contributions  reduce the amount of the participants' salary
     subject to current  Federal  income tax and,  subject to  applicable  laws,
     state and local  income  taxes.  Such  contributions  are subject to Social
     Security taxes.

     All contributions under the Plan are held in a trust fund with trustees who
     are appointed by the Board of Directors  and are members of the  Committee.
     The Committee is also the  administrative  committee of the Plan.  The Plan
     makes available the funds in which participants may invest. Such investment
     options may be changed from time to time.

     Rollover  Contributions  - If a participant of the Plan receives a lump-sum
     distribution  from a qualified savings or profit sharing plan of a previous
     employer or plan,  a  "rollover"  contribution  by the  participant  of the
     amount of the lump-sum distribution may be made to the Plan.

     Participant   Accounts  -  Individual  accounts  are  maintained  for  each
     participant.  Each participant's account is credited with the participant's
     contribution,  the Company's matching  contribution and discount on Company
     Common Stock, if applicable,  and allocations of (1) Company  discretionary
     contributions and (2) Plan earnings, and charged with an allocation of Plan
     losses.  Allocations are based on participant earnings or account balances,
     as defined.  The benefit to which a participant  is entitled is the benefit
     that can be provided from the  participant's  vested account as provided in
     the Plan Document.

     Vesting  and  Forfeitures  -  Participants  will be 100% vested in employer
     match  and  discount  contributions  on the  earlier  to  occur  of (i) the
     participant's  completion  of three (3) years of service  with the Company,
     (ii) the  participant's  retirement  from the Company at age  fifty-five or
     older or (iii) the death of the  participant.  A  participant  will be 100%
     vested   immediately   in   his  or  her   deferred   cash   contributions,
     rollover/transfer  contributions,  and  earnings  thereon,  if  any.  If  a
     participant  does not vest,  such  participant  will  forfeit the match and
     discount,  and any  earnings  thereon  into a  forfeiture  account  that is
     maintained by Vanguard.

     On December 31, 2003 and 2002, forfeited nonvested accounts totaled $30,709
     and $16,852  respectively.  These  accounts  will be used to reduce  future
     employer  contributions.  During the year ended December 31, 2003, employer
     contributions were reduced by $3,274 from forfeited nonvested accounts.

     Effective with the date of  acquisition,  an employee who was a participant
     of Eastern Enterprises,  Colonial Gas and EnergyNorth (and all subsidiaries
     of the aforementioned  companies that participate in the Plan) will be 100%
     vested  in  matching   contributions  made  on  the  participant's  behalf,
     including  discount  on Company  Common  Stock and  discount  on  dividends
     attributable  to such stock. An employee who was hired after this date will
     be subject to the current KeySpan vesting schedule.



                                      -5-



     Investments - All employees who are eligible  pursuant to their  collective
     bargaining  agreement  have an  opportunity  to  acquire  shares of Company
     Common  Stock  ($.01 par value) at a 10%  discount.  In addition to Company
     Common  Stock,   participants  may  invest  in  other  investment   options
     (collectively, the "Funds").

     At the  direction  of the  participants,  Plan  assets are  invested in the
     KeySpan Common Stock Fund,  and/or one or more of the following  Funds from
     the Vanguard Group, namely: Vanguard Windsor Fund, Vanguard 500 Index Fund,
     Vanguard  Retirement  Savings  Trust,   Vanguard  Explorer  Fund,  Vanguard
     LifeStrategy  Conservative  Growth  Fund,  Vanguard  LifeStrategy  Moderate
     Growth Fund,  Vanguard  LifeStrategy Growth Fund, Vanguard Windsor II Fund,
     Vanguard PRIMECAP Fund, Vanguard  International Growth Fund, Vanguard Total
     Bond Market Index Fund,  Vanguard  U.S.  Growth Fund.  Participants  should
     refer to the applicable  Fund's  prospectus  for a complete  description of
     each Fund.

     Participant  Loans -  Participants  may  borrow a minimum  of $1,000  and a
     maximum  amount  not  to  exceed  the  lesser  of  $50,000  or  50%  of the
     participants'  account  balance from the Plan (only employee  deferred cash
     contributions,  rollover/transfer  contributions  and earnings  thereon are
     used to determine the maximum loan amount that can be taken). Currently, no
     more than two loans  are  allowed  outstanding  at the same  time.  General
     purpose loans are payable over a period not to exceed five years,  and bear
     interest  at the prime  rate  plus 1%  (prime  rate at the time the loan is
     requested).  Currently,  participants  may  also  amortize  a loan  for the
     purchase of their primary residence over a fifteen-year period, which bears
     interest  at  the  prime  rate  plus  1%.  The  loans  are  secured  by the
     participants' interest in the Plan.

     Payment of Benefits - On termination  of service due to death,  disability,
     or retirement,  a participant may elect to receive either a lump-sum amount
     equal  to  the  value  of  the  participant's  vested  account,  or  annual
     installments.  For termination of service for other reasons,  a participant
     may receive  the value of the  participant's  vested  account as a lump-sum
     distribution.

     Trustees - The Vanguard Group was appointed to act as the trustee under the
     Plan to  receive  and hold  Company  Common  Stock  and the  investment  of
     contributions  in the  other  funds  as  described  herein  and in the Plan
     Document. Pursuant to a trust document executed by the trustee, the trustee
     is subject to the same fiduciary  responsibility to the Plan's participants
     as  an  independent  trustee.  The  Committee  continues  to  be  the  Plan
     Administrator and trustee for the KeySpan Energy Preferred Stock Fund.


2.    SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

     Basis of  Accounting  - The  accompanying  financial  statements  have been
     prepared in accordance with accounting principles generally accepted in the
     United States of America.

     Use of Estimates - The  preparation  of financial  statements in conformity
     with  accounting  principles  generally  accepted  in the United  States of
     America  requires  management to make estimates and assumptions that affect
     the reported  amounts of assets available for benefits and changes therein.
     Actual results could differ from those estimates.

     Risks and Uncertainties - The Plan provides for various investment options.
     The  Plan's  mutual  funds  invest in  various  securities  including  U.S.
     Government  securities,  corporate debt  instruments and corporate  stocks.
     Investment  securities,  in general,  are exposed to various  risks such as
     interest rate,  credit and overall market  volatility.  Due to the level of
     risk  associated  with  certain  investment  securities,  it is  reasonably



                                      -6-


     possible that changes in the values of investment  securities will occur in
     the near term and that such changes could materially  affect  participants'
     account  balances  and the  amount  reported  in the  statement  of  assets
     available for plan benefits.

     Investment  Valuation and Income  Recognition - The Plan's  investments are
     stated at fair value.  Shares of mutual funds are valued at quoted  closing
     market  prices,  which  represent the net asset value of shares held by the
     Plan on the last business day of the year.

     Amounts for securities that have no quoted market price represent estimated
     fair value. Many factors are considered in arriving at that fair value. The
     approximate  value of the KeySpan  Common  Stock Fund is the quoted  market
     price of the  Company's  common  stock.  The KeySpan  Common  Stock Fund is
     divided into fund units. Each unit represents a portion of ownership in the
     fund and consists  primarily of shares of Company  Common Stock and a small
     cash  balance so that  transactions  can be  processed  daily.  The KeySpan
     Preferred  Stock is not publicly  traded,  is recorded at par value of $100
     and pays a 6 % dividend semi-annually.  Fair value of the common collective
     trust has been estimated by Vanguard based on the underlying  assets of the
     portfolio.

     Purchases  and sales of  securities  are  recorded on a  trade-date  basis.
     Dividend  income is recorded on the  ex-dividend  date.  Interest income is
     recorded on an accrual basis.

     Participant loans are valued at outstanding loan balances.

     Administrative  Expenses - Expenses for the  administration of the Plan are
     paid for  either  by the plan  sponsor  or the Plan as  stated  in the plan
     document.  KeySpan and its  subsidiaries  are allocated for their  expenses
     related to administration of the Plan as well as matching  contributions on
     Company Common Stock.  Discount on Company Common Stock for KeySpan and its
     subsidiaries are allocated to KeySpan only.

     Payment of Benefits - Benefits to participants are recorded when paid.



                                      -7-




3. INVESTMENTS

     The following  investments  represented  five percent or more of the Plan's
     assets available as of December 31, 2003 and 2002:



                                                                                2003                   2002
                                                                                                  

      KeySpan Stock Funds -
        *KeySpan Common Stock Fund, 2,587,302 and
          2,293,165 units, respectively**                                         $94,876,360            $80,581,813
      Common and Collective Trust -
         Vanguard Retirement Savings Trust, 117,802,011
         and 109,380,719 shares, respectively**                                   117,802,011            109,380,719
      Mutual Funds:
         Vanguard PRIMECAP Fund, 1,522,871 and
          1,445,173 shares, respectively**                                         80,773,101             55,870,398
         Vanguard 500 Index Fund, 359,760 and
          325,575 shares, respectively**                                           36,936,510             26,420,412
         Vanguard Windsor Fund, 2,157,870 and
          2,063,144 shares, respectively**                                         35,086,969             24,757,726
         Vanguard Windsor Fund II, 1,318,174 and
          1,253,239 shares, respectively**                                         34,918,418             26,067,376



      *Nonparticipant directed
      **Permitted party-in-interest


     During the year ended December 31, 2003, the Plan's investments  (including
     gains and losses on  investments  brought and sold,  as well as held during
     the year) appreciated in value by $63,493,656 as follows:

      KeySpan Common Stock                                       $    4,366,846
      Mutual Funds                                                   59,126,810
                                                               ----------------
           Net Appreciation of Investments                          $63,493,656
                                                               ================



                                      -8-





4.    NONPARTICIPANT-DIRECTED INVESTMENTS

     Information  about the  assets  as of  December  31,  2003 and 2002 and the
     significant components of changes in assets for the year ended December 31,
     2003 relating to the non participant-directed investments is as follows:

                                                                     2003
       KeySpan Common Stock Fund

         Assets, beginning of year                               $80,581,813

       Changes in assets:
         Net appreciation in investment                            4,366,846
         Dividend income                                           4,275,949
         Employer contributions                                    3,178,023
         Participant contributions                                 6,313,363
         Participant loan repayments                               4,024,574
         Net assets transferred in (out)                             283,387
         Benefits paid to participants                           (2,129,545)
         Participant loan withdrawals                            (3,164,016)
         Transfers to participant-directed investments           (2,854,034)
                                                             ----------------

       Net change                                                 14,294,547
                                                             ----------------

       End of year                                               $94,876,360
                                                             ================


5.    FEDERAL INCOME TAX STATUS

     The  Internal   Revenue  Service  has  determined  and  informed  the  Plan
     Administrator,  by a  letter  dated  January  15,  2003,  that  the Plan is
     qualified and the Trust established under the Plan is tax-exempt, under the
     appropriate  sections of the Internal  Revenue Code  ("IRC").  The Plan has
     been amended since receiving the determination letter; however, the Company
     and the Plan Administrator  believe that the Plan is currently designed and
     being operated in compliance  with the applicable  requirements of the IRC.
     Therefore,  no provision  of income  taxes has been  included in the Plan's
     statement of changes in assets available for benefits.



6.    RELATED PARTY TRANSACTIONS

     Certain  Plan  investments  are  shares  of mutual  funds and a common  and
     collective trust managed by the asset custodian, trustee, and recordkeeper,
     the Vanguard Group, as defined by the Plan and therefore these transactions
     qualify as party-in-interest transactions. The Plan's investment in Company
     Common Stock during the Plan year ended December 31, 2003 and 2002 are also
     party-in-interest  transactions.  Certain  employees  and  officers  of the
     Company,  who may also be participants in the Plan, perform  administrative
     services  to the  Plan  at no  cost to the  Plan.  These  party-in-interest
     transactions  are  not  deemed  prohibited  because  they  are  covered  by
     statutory  and  administrative  exemptions  from the Code and the rules and
     prohibited transactions of ERISA.


                                      -9-


     At December 31, 2003 and 2002, the Plan held units  2,587,302 and 2,293,165
     units,  respectively,  of  KeySpan  Common  Stock  with  a  cost  basis  of
     $77,542,651 and $66,763,708,  respectively.  During the year ended December
     31, 2003, the Plan recorded dividend income of $4,275,949.


7.    PLAN TERMINATION

     Although  the  Company  has  not  expressed  any  intent  to do so,  it may
     terminate the Plan at any time, subject to the terms and conditions of each
     respective  collective   bargaining   agreement.   In  the  event  of  Plan
     termination,  the accounts of all participants  affected shall become fully
     vested  and  nonforfeitable.  Assets  remaining  in the trust  fund will be
     distributed to the  participants  and  beneficiaries in proportion to their
     respective account balances.


8.    SUBSEQUENT EVENTS

     Effective  January 1, 2004, the match for Ravenswood  Local 1-2 Members was
     changed  from  1/3 of the  first  $30 to  1/3 of the  first  $45 of  weekly
     contributions.

     Effective June 1, 2004,  KeySpan Energy Delivery New England Local 12012-03
     members  hired  after April 15, 1993 will be given a match of $0.50 on each
     $1.00 that the employee  contributes to the Plan, up at a maximum  employee
     contribution of 7%.

                                     ******



                                      -10-




KEYSPAN ENERGY 401(k) PLAN FOR UNION EMPLOYEES

FORM 5500, SCHEDULE H, PART IV, LINE 4i -
SCHEDULE OF ASSETS (HELD AT END OF YEAR)
AS OF DECEMBER 31, 2003
- -------------------------------------------------------------------------------


Identity of Issue, Borrower,
Lessor or Similar Party, and
Description of Investment Including
Maturity Date, Rate of Interest, Collateral,                                           Number of           Market
Par or Maturity Value                                                  Cost**         Units/Shares          Value

                                                                                                  

*KeySpan Common Stock Fund                                             $77,542,651         2,587,302        $94,876,360
*KeySpan Preferred Stock Fund                                            5,265,513            52,656          5,265,560

*Vanguard Funds:
  Vanguard Retirement Savings Trust                                                      117,802,011        117,802,011
  Vanguard PRIMECAP Fund                                                                   1,522,871         80,773,101
  Vanguard 500 Index Fund                                                                    359,760         36,936,510
  Vanguard Windsor Fund                                                                    2,157,870         35,086,969
  Vanguard Windsor II Fund                                                                 1,318,174         34,918,418
  Vanguard Total Bond Market Index Fund                                                    2,048,488         21,119,913
  Vanguard LifeStrategy Moderate Growth Fund                                               1,086,771         18,051,260
  Vanguard Explorer Fund                                                                     374,730         24,589,758
  Vanguard International Growth Fund                                                         442,323          7,134,662
  Vanguard U.S. Growth Fund                                                                  462,672          7,014,115
  Vanguard LifeStrategy Growth Fund                                                          317,492          5,765,650
  Vanguard LifeStrategy Conservative Growth Fund                                             250,594          3,643,633
                                                                                                      ------------------
                                                                                                            492,977,920
*Participant loans receivable
(maturing 2004 to 2020 at interest rates of 5.0% to 11.0%)                                                   25,499,700
                                                                                                      ------------------

Total                                                                                                      $518,477,620
                                                                                                      ==================



*Permitted party-in-interest.
**Cost information is not required for participant-directed investments and,
therefore, is not included.




                                      -11-



SIGNATURES
- -------------------------------------------------------------------------------





Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the Plan
Committee  has duly caused this annual  report to be signed on its behalf by the
undersigned hereunto duly authorized.


                                 KeySpan Energy 401(k) Plan for
                                 Union Employees

                                      BY:   /s/ Michael J. Taunton

                                            Michael J. Taunton
                                            Senior Vice President and Treasurer
                                            KeySpan Corporation









Date:  June 28, 2004

                                      -12-







                                                                   Exhibit 23.1





INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM'S CONSENT


We consent to the  incorporation  by reference  in  Registration  Statement  No.
333-40472 of KeySpan  Corporation on Form S-8 of our report dated June 28, 2004,
appearing in this Annual  Report on Form 11-K of the KeySpan  Energy 401(k) Plan
for Union Employees for the year ended December 31, 2003.

/s/ Deloitte & Touche LLP
New York, New York
June 28, 2004








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