THIS  DOCUMENT IS A COPY OF THE FORM 11-K FILED ON JUNE 30,  2005  PURSUANT TO A
RULE 201 TEMPORARY HARDSHIP EXEMPTION.


                       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, 2004

                                       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, 2004 and 2003                                            2

   Statement of Changes in Assets Available for Benefits for the Year Ended December 31, 2004                              3

   Notes to Financial Statements                                                                                        4 - 11


SUPPLEMENTAL SCHEDULES:

   Form 5500, Schedule H, Part IV, Line 4i - Schedule of Assets (Held at End of Year)
     as of December 31, 2004                                                                                              12

   Form 5500, Schedule H, Part IV, Line 4j - Schedule of Reportable Transactions
      for the Year Ended December 31, 2004                                                                                13

   Form 5500, Schedule H, Part IV, Question 4a - Delinquent Participant Contributions
     for the Year Ended December 31, 2004                                                                                 14



SIGNATURES                                                                                                                15

EXHIBIT INDEX:

    Consent of Independent Registered Public Accounting Firm                                                              16




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 and Participants 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,  2004 and 2003,  and the  related  statement  of changes in assets
available  for benefits for the year ended  December 31, 2004.  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.  The Plan is not required to have,
nor were we engaged to perform,  an audit of its internal control over financial
reporting.  Our audits included consideration of internal control over financial
reporting as a basis for designing audit  procedures that are appropriate in the
circumstances,  but  not  for  the  purpose  of  expressing  an  opinion  on the
effectiveness  of  the  Plan's  internal   control  over  financial   reporting.
Accordingly,  we express no such opinion. An audit also includes examining, on a
test basis,  evidence  supporting  the amounts and  disclosures in the financial
statements,  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, 2004 and
2003, and the changes in assets  available for benefits for the years then ended
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 of (1) assets
(held at end of year) as of December 31, 2004 (2)  reportable  transactions  for
the year ended December 31, 2004 (3) delinquent  participant  contributions  for
the year ended  December 31, 2004 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 2004 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 29, 2005










KEYSPAN ENERGY 401(K) PLAN FOR MANAGEMENT EMPLOYEES


STATEMENTS OF ASSETS AVAILABLE FOR BENEFITS
DECEMBER 31, 2004 AND 2003
- ----------------------------------------------------------------------------------------------------------------------------------
                                                                                                               
                                                                              2004                                    2003
ASSETS:
   Participant-directed investments                                         $ 492,546,896                           $ 427,196,286
   Nonparticipant-directed investments                                        127,938,127                             117,345,785
                                                          --------------------------------           -----------------------------
                Total investments                                             620,485,023                             544,542,071
                                                          --------------------------------           -----------------------------

RECEIVABLES:
   Participant contributions                                                       34,365                                  67,661
   Employer contributions                                                          12,696                                  25,529
                                                          --------------------------------           -----------------------------
                Total receivables                                                  47,061                                  93,190
                                                          --------------------------------           -----------------------------

ASSETS AVAILABLE FOR BENEFITS                                               $ 620,532,084                           $ 544,635,261
                                                          ================================           =============================



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, 2004
- --------------------------------------------------------------------------------

ADDITIONS TO ASSETS ATTRIBUTED TO:                                   2004

Net investment income:
Net appreciation in fair value of investments                      $ 47,322,988
Interest and dividends                                               16,443,893
                                                               -----------------
Net investment income                                                63,766,881
                                                               -----------------

Contributions:
Participants                                                         28,107,921
Employer                                                             11,592,743
Rollovers                                                               795,510
                                                               -----------------
Total Contributions                                                  40,496,174
                                                               -----------------

Other Additions
Net assets transferred in from the Union Plan                         1,794,225
                                                               -----------------

Total Additions                                                     106,057,280

DEDUCTIONS FROM ASSETS ATTRIBUTED TO:
Benefits paid to participants                                       (30,128,957)
Plan administration fees                                                (31,500)
                                                               -----------------

Total Deductions                                                    (30,160,457)

INCREASE IN ASSETS                                                   75,896,823

ASSETS AVAILABLE FOR BENEFITS:
Beginning of Year                                                   544,635,261
                                                               -----------------


End of Year                                                       $ 620,532,084
                                                               =================



See notes to financial statements.






                                       3



KEYSPAN ENERGY 401(k) PLAN FOR MANAGEMENT EMPLOYEES

NOTES TO FINANCIAL STATEMENTS
AS OF DECEMBER 31, 2004 AND 2003 AND FOR THE YEAR ENDED DECEMBER 31, 2004
- --------------------------------------------------------------------------------


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").

Plan  Amendments - 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.

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.


                                       4



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.

Effective June 1, 2004, The Committee  approved the addition of Seneca Upshur to
the list of Participating Employers in the 401(k) Plan for Management Employees.
The employees  are given a match of $0.50 of each $1.00 that they  contribute up
to a maximum of 6% of the  participant's  compensation and are entitled to a 10%
discount on the purchase of Company  Common  Stock.  Prior  service time for all
Seneca Upshur employees was recognized for vesting purposes in the Plan.

On December 14, 2004, the Committee  approved reducing the involuntary  cash-out
threshold from $5,000 to $1,000 effective March 1, 2005.

Contributions -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%) and
contributed to the Plan on the participants' behalf by the Company. Compensation
may not be reduced by an amount greater than the  limitation  imposed by Section
402(g) of the Internal Revenue Code. 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  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 Company  Common Stock and a discount on Company Stock for such
matching  contributions  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 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.


                                       5



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  (iv) the  disability  of the  participant  if the
participant  is  receiving  disability  benefits  under  Title II of the  Social
Security  Act.  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, 2004 and 2003,  forfeited  non-vested  accounts totaled $719,212
and $590,460 respectively. These accounts will be used to reduce future employer
contributions  and pay Plan  administration  expenses.  During  the  year  ended
December 31, 2004,  employer  contributions  were reduced by $316 from forfeited
non-vested 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.

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,  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 Mid-Cap Index Fund, and American
Funds Growth Fund of America, Class R-5 Shares. Participants should refer to the
applicable Fund's prospectus for a complete description of the Fund.

On May 21, 2004,  The  Committee  approved the removal of Vanguard  U.S.  Growth
Fund,  the  addition  of  American  Funds  Growth  Fund of  America,  Class  R-5
("American  Funds Growth Fund") and the Vanguard  Mid-Cap Index Fund.  Beginning
August 20, 2004, no new  contributions  or transfers  into Vanguard U.S.  Growth
were  permitted.  Participant  contribution  allocations to Vanguard U.S. Growth
were redirected to American Funds Growth Fund.  Participants  were given 90 days
to transfer  their  Vanguard U.S.  Growth  balances into other funds in the Plan
otherwise all remaining balances would  automatically be transferred to American
Funds Growth Fund.

On November 19, 2004, remaining Vanguard U.S. Growth balances of $5,955,684 were
mapped to American Funds Growth Fund.

The  Vanguard  Mid-Cap  Index was added as an  investment  option to the Plan to
complement the existing fund line-up.

Liquidation of Funds - During 2004, in an effort to allow  participants  greater
investment flexibility,  the Preferred Stock and Substock funds in the Plan were
liquidated.  Proceeds paid to participants  were transferred from the respective
funds to the  Vanguard  Retirement  Savings  Trust.  The funds were  immediately
eligible to be transferred to other funds in the Plan. Details regarding the two
liquidations are below.


                                       6




Preferred Stock Fund
- --------------------

On June 30, 2004,  KeySpan's Board of Directors authorized the redemption of all
of the outstanding shares of Preferred Stock Series A partially held by the Plan
in the Preferred Stock Fund.

On July 29,  2004,  the  Preferred  Stock  Fund was  liquidated.  At the time of
redemption,  2,601  participants  held 32,114 shares.  Each participant who held
shares of the preferred stock received the par value of $100 per share plus a 2%
premium  for a total  of  $102  per  share.  The  total  redemption  amount  was
$3,275,582,  which included a premium of $64,228. KeySpan paid accrued dividends
through July 29, 2004 of $79,749 ($2.4833 per share).

Sub-Stock Fund
- --------------

On June 29, 2004, The Board of Directors of KeySpan  Corporation  authorized the
repurchase of all  outstanding  shares of the subsidiary  stock held by the Plan
that were currently allocated to Plan participants. There were 502,169 allocated
shares  held  in  the  KeySpan  Sub-Stock  fund  with  a fair  market  value  of
$1,027,131.

On October 15, 2004,  the Sub-Stock  fund was  liquidated  and the Plan received
total proceeds of $1,350,003  based on an independent  third party  appraisal of
the value of the allocated Sub-Stock and the cash contribution made to the Plan.
These proceeds were distributed amongst 1,338 active employees.

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 - Upon  termination  of service,  a participant  or eligible
beneficiary  whose  account  balance is greater than $5,000,  may elect to leave
their balance in the Plan,  receive a lump-sum  amount equal to the value of the
participant's vested account,  elect to receive annual installments or a partial
distribution,  or roll over their balance to an Individual Retirement Account or
another qualified plan.

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.

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.


                                       7



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.

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.  Valuation of the KeySpan  SubStock,  which
was not publicly traded, was obtained from independent outside  appraisals.  The
KeySpan  Preferred Stock was not publicly traded,  and was recorded at par value
of  $100  and  paid 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  and  discount on
Company Common Stock.

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


                                       8



3.  INVESTMENTS

The following investments represent 5% of more of the Plan's assets available as
of December 31, 2004 and 2003:



                                                                                            2004                     2003
                                                                                                            
       KeySpan Stock Fund -
         *KeySpan Common Stock Fund, 3,256,252 and
           3,200,049 units, respectively**                                               $127,938,127             $117,345,785
       Common and Collective Trust -
          Vanguard Retirement Savings Trust, 110,935,142
          and 101,407,274 shares, respectively**
                                                                                          110,935,142              101,407,274
       Mutual Funds:
          Vanguard PRIMECAP Fund, 1,572,250 and
           1,534,446 shares, respectively**                                                97,951,182               81,387,014
          Vanguard 500 Index Fund, 449,286 and
           439,388 shares, respectively**                                                  50,158,311               45,111,940
          Vanguard Windsor Fund, 2,664,050 and
           2,615,251 shares, respectively**                                                48,139,390               42,523,980
          Vanguard Windsor Fund II, 1,438,508 and
           1,319,154 shares, respectively**                                                44,205,357               34,944,392
          Vanguard Explorer Fund, 449,657 and
           423,947 shares, respectively**                                                  33,530,945               27,819,425


        * Non-participant directed
        ** Permitted party-in-interest

     During  2004,  the  Plan's  investment   (including  gains  and  losses  on
     investments  bought and sold, as well as held during the year)  appreciated
     in value by $47,322,988 as follows:

        KeySpan Common Stock                                                                                       $8,984,974
        KeySpan Preferred Stock                                                                                        64,228
        Mutual Funds                                                                                               38,273,786
                                                                                                            ------------------
        Net Appreciation of Investments                                                                           $47,322,988
                                                                                                            ==================




                                       9




4. NONPARTICIPANT-DIRECTED INVESTMENTS

        Information about the assets as of December 31, 2004 and 2003 and the
        significant components of changes in assets for the year ended December
        31, 2004 relating to the non participant-directed investments is as
        follows:



                                                                                                                     2004
                                                                                                             
         KeySpan Common Stock fund - beginning of year:                                                         $117,345,785

         Changes in assets:
            Net appreciation in fair value of investment                                                           8,984,974
            Dividend income                                                                                        5,762,250
            Employer contributions                                                                                11,288,744
            Participant contributions                                                                             12,365,955
            Participant loan repayments                                                                            2,513,221
            Net assets transferred in                                                                                303,205
            Benefits paid to participants                                                                        (6,544,943)
            Participant loan withdrawals                                                                         (1,356,623)
            Transfers to participant-directed investments                                                       (22,724,441)
                                                                                                   --------------------------

         Net change                                                                                               10,592,342
                                                                                                   --------------------------


         KeySpan Common Stock fund - end of year:                                                               $127,938,127
                                                                                                   ==========================



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 for income taxes has
been included in the Plan's financial statements.

6. EXEMPT PARTY-IN-INTEREST 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 exempt
party-in-interest transactions. The Plan's transactions involving Company Common
Stock 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.


                                       10




At December 31, 2004 and 2003,  the Plan held  3,256,252  and  3,200,049  units,
respectively,  of KeySpan  Common Stock,  the sponsoring  employer,  with a cost
basis of  $105,037,656  and  $99,026,743,  respectively.  During  the year ended
December 31, 2004, the Plan recorded dividend income of $5,762,250.

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. NON EXEMPT PARTY-IN-INTEREST TRANSACTIONS

KeySpan remitted to the trustee certain 2001  contributions for two employees of
KeySpan  Home  Energy  Services  New  England  on  April  8,  2005  and  a  2002
contribution  for one  employee of KeySpan  Home Energy  Services New England on
June 24, 2005.  These  contributions,  totaling  $795,  were remitted later than
required by D.O.L. Regulation 2510.3-102. The Company forwarded additional funds
totaling  $300  to  compensate  for  participants'  lost  earnings,  which  were
deposited in the employees' accounts.

9. SUBSEQUENT EVENTS

On January 20, 2005 all  participant  balances  in Vanguard  Retirement  Savings
Trust, with an expense ratio of 0.30%,  were transferred to Vanguard  Retirement
Savings  Trust V,  which  offers an expense  ratio of 0.25%.  The two funds hold
identical investments.

     During the 1st  quarter of 2005,  KeySpan  divested of the  following  five
subsidiaries:

        Subsidiary                                    Date of Sale
        ----------                                    ------------
        Granite State Plumbing                        January 14, 2005
        Northern Peabody                              January 18, 2005
        Delta, Inc.                                   January 21, 2005
        Binsky and Synder, Inc.                       January 31, 2005
        WDF Greene, Inc.                              February 11, 2005

Employees under these subsidiaries are not eligible to contribute to the Plan as
of the  respective  dates of sale.  These  employees are  considered  terminated
participants and have the same distribution  options that are available to other
terminated  employees.  As of December 31, 2004, 333 participants  employed with
the above subsidiaries held an aggregate balance of $13,179,310.



                                       11






KEYSPAN ENERGY 401(k) PLAN FOR MANAGEMENT EMPLOYEES

FORM 5500, SCHEDULE H, PART IV, LINE 4i--
SCHEDULE OF ASSETS (HELD AT END OF YEAR)
DECEMBER 31, 2004
- ------------------------------------------------------------------------------------------------------------------------------------

                                                     (c) Description of Investment, Including
                    (b) Identity of Issue, Borrower,     Maturity Date, Rate of Interest,                               (e) Current
(a)                     Lessor or Similar Party          Collateral, Par or Maturity Value     (d) Cost       Shares         Value
                                                                                                            
*   KeySpan Common Stock Fund                        Common Stock                           $ 105,037,656   3,256,252  $ 127,938,127
    American Funds Growth Fund of America            Mutual Fund                                 **           303,502      8,306,854

    Vanguard Funds:
*   Vanguard Retirement Savings Trust                Common Collective Trust                     **       110,935,142    110,935,142
*   Vanguard PRIMECAP Fund                           Mutual Fund                                 **         1,572,250     97,951,182
*   Vanguard 500 Index Fund                          Mutual Fund                                 **           449,286     50,158,311
*   Vanguard Windsor Fund                            Mutual Fund                                 **         2,664,050     48,139,390
*   Vanguard Windsor II Fund                         Mutual Fund                                 **         1,438,508     44,205,357
*   Vanguard Total Bond Market Index Fund            Mutual Fund                                 **         2,751,007     28,252,840
*   Vanguard LifeStrategy Moderate Growth Fund       Mutual Fund                                 **         1,511,477     27,070,552
*   Vanguard Explorer Fund                           Mutual Fund                                 **           449,657     33,530,945
*   Vanguard International Growth Fund               Mutual Fund                                 **           692,131     13,053,592
*   Vanguard LifeStrategy Growth Fund                Mutual Fund                                 **           476,774      9,554,557
*   Vanguard LifeStrategy Conservative Growth Fund   Mutual Fund                                 **           488,734      7,458,081
*   Vanguard Mid-Cap Index Fund                      Mutual Fund                                 **           201,282      3,148,053
                                                                                                                           ---------
                                                                                                                         609,702,983

*    Participant loans receivable                    Participant loans (maturing 2005 to 2020                             10,782,040
                                                     at interest rates of 5% to 10.5%)         **                         ----------

       Total                                                                                                           $ 620,485,023
                                                                                                                       =============


*    Permitted party-in-interest.

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



                                       12






KEYSPAN ENERGY 401(k) PLAN FOR MANAGEMENT EMPLOYEES

Form 5500, Schedule H, Part IV, Line 4j -                                                                              Plan # 090899
Schedule of Reportable Transactions                                                                                 EIN # 11-3431358
Year Ended December 31, 2004


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

Identity            Description of                                                                     Current Value of   Historical
of Party            Asset (include interest)                                             Historical         Asset on        Gain
Involved            rate and maturity in the            Purchase Price  Selling Price  Cost of Asset   Transaction Date    (Loss)
                    case of a loan)
- ------------------------------------------------------------------------------------------------------------------------------------
                                                                                                      
The Vanguard Group  Vanguard Retirement Savings Trust  $35,534,876.97                                 $35,534,876.97
The Vanguard Group  Vanguard Retirement Savings Trust                  $26,007,009.53  $26,007,009.53  26,007,009.53             $ -
N/A                 KeySpan Common Stock                32,479,018.73                                  32,479,018.73
N/A                 KeySpan Common Stock                                30,871,660.08   26,419,824.09  30,871,660.08    4,451,835.99







                                       13





KEYSPAN ENERGY 401(k) PLAN FOR MANAGEMENT EMPLOYEES



FORM 5500 SCHEDULE H, PART IV, LINE 4a -
DELINQUENT PARTICIPANT CONTRIBUTIONS
YEAR ENDED DECEMBER 31, 2004
- --------------------------------- ---------------------------- -- ------------------------------------------------------------------

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
          Identity of                      Employer,                                                    Transferred Late to the Plan
         Party Involved           or Other Party-in-Interest     Description of Transactions
                                                                                                                   
                                                                                                                         $795
KeySpan Corporation             Employer/Plan Sponsor             KeySpan  remitted to the trustee
                                                                  certain 2001  contributions
                                                                  for two  employees  of  KeySpan
                                                                  Home  Energy  Services  New
                                                                  England  on April 8,  2005 and a
                                                                  2002  contribution  for one
                                                                  employees  of KeySpan  Home Energy
                                                                  Services  New England on
                                                                  June 24, 2005.  These  contributions,
                                                                  totaling  $795,  were remitted later
                                                                  than required   by  D.O.L. Regulation
                                                                  2510.3-102.  The Company forwarded
                                                                  additional funds totaling
                                                                  $300 to compensate for  participants'
                                                                  lost earnings,  which were deposited
                                                                  in the employees' accounts.



















                                   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 29, 2005