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 Management 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 MANAGEMENT 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 SCHEDULES:

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

   Form 5500, Schedule H, Part IV, Question 4a -
   Delinquent Participant Contributions
   for the Year Ended December 31, 2003                                      12

SIGNATURES                                                                   13

EXHIBIT INDEX:

    Independent Registered Public Accounting Firm's Consent                  14



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  Management  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 the 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  schedules listed in the
Table of Contents are presented  for the purpose of additional  analysis and are
not a required part of the basic  financial  statements,  but are  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.  These schedules are the  responsibility  of the Plan's  management.  Such
schedules have been subjected to the auditing procedures applied in our audit of
the basic 2003 financial  statements  and, in our opinion,  are 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 MANAGEMENT EMPLOYEES

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




ASSETS:                                                                      2003                           2002
                                                                                              
   Participant-directed investments, at fair value                   $427,196,286                   $338,880,863
   Nonparticipant-directed investments, at fair value                 117,345,785                    100,665,054
                                                                  ----------------               ----------------
                    Total Investments                                 544,542,071                    439,545,917
                                                                  ----------------               ----------------

RECEIVABLES:
Participants' contribution                                                 67,661                        528,243
Employers' contribution                                                    25,529                        220,340
                                                                  ----------------               ----------------
                    Total Receivables                                      93,190                        748,583
                                                                  ----------------               ----------------

ASSETS AVAILABLE FOR BENEFITS                                        $544,635,261                   $440,294,500
                                                                  ================               ================







See notes to financial statements.



                                       2





KEYSPAN ENERGY 401(k) PLAN FOR MANAGEMENT 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                                                                  $71,634,445
   Interest and dividends                                                                            14,715,182
                                                                                                ----------------
                    Net investment income                                                            86,349,627
                                                                                                ----------------

Contributions:
   Participants                                                                                      27,176,982
   Employer                                                                                          11,692,090
   Rollovers                                                                                            362,390
                                                                                                ----------------
                    Total Contributions                                                              39,231,462
                                                                                                ----------------

                    Total Additions                                                                 125,581,089

DEDUCTIONS FROM ASSETS ATTRIBUTED TO:

Benefits paid to participants                                                                      (22,059,124)
Net assets transferred in from the Union Plan
                                                                                                        818,796
                                                                                                ----------------
                    Total Deductions                                                               (21,240,328)
                                                                                                ----------------

INCREASE IN ASSETS                                                                                  104,340,761

ASSETS AVAILABLE FOR BENEFITS:

   Beginning of Year                                                                                440,294,500
                                                                                                ----------------
                                                                                                   $544,635,261
   End of Year
                                                                                                ================







See notes to financial statements.



                                       3



KeySpan Energy 401(k) Plan For Management Employees

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


1.    DESCRIPTION OF THE PLAN

     The following  description of the KeySpan Energy 401(k) Plan for Management
     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 Management 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)  allow
     catch-up  contributions  for  employees  age 50 and  over;  4)  reduce  the
     hardship withdrawal waiting period from 12 months to 6 months; and 5) 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 - On December 19, 2002, the Committee approved the granting
     of  prior  service  in  connection  with  the  employer   match,   discount
     eligibility and vesting for the newly purchased Algonquin LNG, Inc.

     On August 1, 2003,  KeySpan  acquired  Bard, Rao + Athanas  ("BR+A),  a New
     England HVAC contracting  company. As a result,  prior service time for all
     BR+A management employees was recognized for vesting purposes in the Plan.


                                       4


     Contributions  - All  eligible  employees  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 three months of service. Additionally, all eligible employees
     will receive matching  contributions in the 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,  which is
     maintained by Vanguard.

     On  December  31,  2003 and  2002,  forfeited  nonvested  accounts  totaled
     $590,460 and $467,639  respectively.  These accounts will be used to reduce
     future  employer  contributions.  During the year ended  December 31, 2003,
     employer  contributions  were reduced by $10,652 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 eligible  employees 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 the
     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% (the 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 also
     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 Investment Review Committee continues to be
     the plan administrator and trustee for the KeySpan Energy Preferred and Sub
     Stock Funds.

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
     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.




                                       6



     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.  Investments in
     the KeySpan  SubStock,  which are not publicly  traded,  are obtained  from
     independent outside appraisals. 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.

     The loans to participants are the total  outstanding  principal balance due
     from participants for loans taken from individual accounts.

     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  represent  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, 3,200,048 and
          2,864,686 units, respectively**                                        $117,345,785           $100,665,054
      Common and Collective Trust -
         Vanguard Retirement Savings Trust, 101,407,274
         and 95,194,237 shares, respectively**                                    101,407,274             95,194,237
      Mutual Funds:
         Vanguard PRIMECAP Fund, 1,534,446 and
          1,473,990 shares, respectively**                                         81,387,014             56,984,447
         Vanguard 500 Index Fund, 439,388 and
          398,537 shares, respectively**                                           45,111,940             32,341,270
         Vanguard Windsor Fund, 2,615,251 and
          2,669,752 shares, respectively**                                         42,523,980             32,037,319
         Vanguard Windsor Fund II, 1,319,154 and
          1,258,098 shares, respectively**                                         34,944,392             26,168,436
         Vanguard Explorer Fund, 423,947 and
          378,596 shares, respectively**                                           27,819,425                      -
         Vanguard Total Bond Market Index Fund,
          2,638,849 and 2,519,015 shares, respectively**                                    -             26,147,379




      *Nonparticipant directed
      ** Permitted party-in-interest



     During  2003,  the  Plan's  investments  (including  gains  and  losses  on
     investments  bought and sold, as well as held during the year)  appreciated
     in value by $71,634,445 as follows:

      KeySpan Common Stock                                        $ 6,040,404
      KeySpan SubStock                                                450,003
      Mutual Funds                                                 65,144,038
                                                        ----------------------
                                                                  $71,634,445
                                                        ======================



                                       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                                                 $100,665,054

             Changes in assets:
                Net appreciation in investment                                               6,040,404
                Dividend income                                                              5,495,428
                Employer contributions                                                      11,742,031
                Participant contributions                                                   12,060,411
                Participant loan repayments                                                  2,781,297
                Net assets transferred in (out)                                              (283,387)
                Benefits paid to participants                                              (2,802,500)
                Participant loan withdrawals                                               (1,195,811)
                Transfers to participant-directed investments                             (17,157,142)
                                                                                       ----------------

             Net change                                                                     16,680,731
                                                                                       ----------------

             End of year                                                                  $117,345,785
                                                                                       ================





5.    FEDERAL INCOME TAX STATUS

     The  Internal   Revenue  Service  has  determined  and  informed  the  plan
     administrator by a letter dated January 5, 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 3,200,049  units and 2,864,686
     units, respectively, of Common Stock of KeySpan Corporation, the sponsoring
     employer,  with a cost basis of $99,026,743 and $86,273,695,  respectively.
     During the year ended December 31, 2003, the Plan recorded  dividend income
     of $5,495,428.


7.    PLAN TERMINATION

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


8.    NONEXEMPT PARTY-IN-INTEREST TRANSACTION

     KeySpan remitted certain December 2003 payroll  deductions for the WDF Inc.
     subsidiary totaling $7,424 to the trustee on March 2, 2004, which was later
     than  required  by D.O.L.  Regulation  2510.3-102.  The  Company  forwarded
     additional funds in the amount of $452 to compensate for participants' lost
     earnings.

     KeySpan  remitted  certain April 2003 payroll  deductions  for the Northern
     Peabody  subsidiary  totaling $540 to the trustee on February 13, 2004. The
     Company forwarded  additional funds in the amount of $138 to compensate for
     participants' lost earnings.


9.    VOLUNTARY COMPLIANCE RESOLUTION

     In May 2004,  KeySpan filed an application for a compliance  statement from
     the Internal  Revenue  Service  under the Voluntary  Compliance  Resolution
     program  ("VCR").  The compliance  statement was sought with respect to the
     following two operational failures:

     o    Missed payroll deductions for the WDF Inc.  subsidiary totaling $7,424
          that  occurred in the fiscal year 2003,  but not reported  until 2004,
          later than required by D.O.L. Regulation 2510.3-102.

     o    Missed payroll deductions for the Northern Peabody subsidiary totaling
          $540 that  occurred in the fiscal year 2003,  but not  reported  until
          2004, later than required by D.O.L. Regulation 2510.3-102.



                                     ******



                                       10




KEYSPAN ENERGY 401(k) PLAN FOR MANAGEMENT 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                                               $99,026,743        3,200,049       $117,345,785

*KeySpan Preferred Stock Fund                                              3,302,035           33,021          3,302,063

*KeySpan SubStock                                                            660,006          660,006          1,350,000

*Vanguard Funds:
  Vanguard Retirement Savings Trust                                                       101,407,274        101,407,274
  Vanguard PRIMECAP Fund                                                                    1,534,446         81,387,014
  Vanguard 500 Index Fund                                                                     439,388         45,111,940
  Vanguard Windsor Fund                                                                     2,615,251         42,523,980
  Vanguard Windsor II Fund                                                                  1,319,154         34,944,392
  Vanguard Total Bond Market Index Fund                                                     2,635,849         27,206,536
  Vanguard LifeStrategy Moderate Growth Fund                                                1,387,253         23,042,272
  Vanguard Explorer Fund                                                                      423,947         27,819,425
  Vanguard International Growth Fund                                                          544,697          8,785,966
  Vanguard U.S. Growth Fund                                                                   482,654          7,317,027
  Vanguard LifeStrategy Growth Fund                                                           399,656          7,257,755
  Vanguard LifeStrategy Conservative Growth Fund                                              403,787          5,871,066
                                                                                                       ------------------
                                                                                                             534,672,495
*Participant loans receivable
(maturing 2004 to 2031 at interest rates of 5.0% to 10.5%)                                                    $9,869,576
                                                                                                       ------------------

Total                                                                                                       $544,542,071
                                                                                                       ==================



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


                                       11




KEYSPAN ENERGY 401(k) PLAN FOR MANAGEMENT EMPLOYEES

FORM 5500 SCHEDULE H, PART IV, LINE 4a -
DELINQUENT PARTICIPANT CONTRIBUTIONS
YEAR ENDED DECEMBER 31, 2003
- -------------------------------------------------------------------------------

Question  4a "Did the  employer  fail to  transmit  to the Plan any  participant
contributions  within  the time  period  described  in 29 CFR  2510.3-102",  was
answered "yes".



                              Relationship to Plan,                                                      Participant Contributions
                                    Employer,                                                             Transferred Late to the
        Identity of                  or Other                                                                      Plan
       Party Involved           Party-in-Interest                 Description of Transactions
                                                                                                         

                               Employer/                 Payroll deductions for the WDF Inc.                      $7,424
KeySpan Corporation            Plan Sponsor              subsidiary were not funded by the 15th
                                                         business day after the month withheld, as
                                                         required by the D.O.L. Regulation
                                                         2510.3-102.  December 2003 payroll
                                                         deductions and lost earnings were invested
                                                         on March 2, 2004.





                            Employer/                    Payroll deductions for the Northern Peabody                $540
KeySpan Corporation         Plan Sponsor                 subsidiary were not funded by the 15th
                                                         business after the month withheld, as
                                                         required by the D.O.L. Regulation 2510.3-102.
                                                         April 2003 payroll deductions
                                                         and lost earnings were invested on
                                                         February 13, 2004.







                                       12



                                   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
                                   Management  Employees

                                        BY:  /s/ Michael J. Taunton

                                             Michael J. Taunton
                                             Senior Vice President and Treasurer
                                             KeySpan Corporation








Date:  June 28, 2004



                                       13






                                                                   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 Management Employees for the year ended December 31, 2003.

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













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