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 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, 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 Union  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 year ended
December 31, 2004, 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 UNION EMPLOYEES

STATEMENTS OF ASSETS AVAILABLE FOR BENEFITS
DECEMBER 31, 2004 AND 2003
- -------------------------------------------------------------------------------------------------------------------------------
                                                                                                            
                                                                          2004                                     2003
ASSETS:
   Participant directed investments                                     $ 484,044,168                            $ 423,601,260
   Nonparticipant directed investments                                    107,460,796                               94,876,360
                                                      --------------------------------         --------------------------------
                  Total investments                                       591,504,964                              518,477,620
                                                      --------------------------------         --------------------------------

RECEIVABLES:
   Participant contributions                                                  550,273                                  471,397
   Employer contributions                                                      50,729                                   46,263
                                                      --------------------------------         --------------------------------
                  Total receivables                                           601,002                                  517,660
                                                      --------------------------------         --------------------------------

ASSETS AVAILABLE FOR BENEFITS                                           $ 592,105,966                            $ 518,995,280
                                                      ================================         ================================




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

ADDITIONS TO ASSETS ATTRIBUTED TO:                                2004

Net investment income:
Net appreciation on investments                                   $ 42,202,444
Interest and dividends                                              16,133,037
                                                               ----------------
Net Investment Income                                               58,335,481
                                                               ----------------

Contributions:
Participants                                                        34,085,075
Employer                                                             3,272,017
Rollovers                                                              306,971
                                                               ----------------
Total Contributions                                                 37,664,063
                                                               ----------------

Total Additions                                                     95,999,544

DEDUCTIONS FROM ASSETS ATTRIBUTED TO:
Benefits paid to participants                                      (21,075,633)
Plan administration fees                                               (19,000)
Net assets transferred out to the Management Plan                   (1,794,225)
                                                               ----------------
              Total Deductions                                     (22,888,858)

INCREASE IN ASSETS                                                  73,110,686

Assets Available for benefits:
Beginning of Year                                                  518,995,280
                                                               ----------------

End of Year                                                      $ 592,105,966
                                                               ================



See notes to financial statements.




                                       3





KEYSPAN ENERGY 401(k) PLAN FOR UNION 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 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").

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 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.

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


                                       4



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.

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 to a maximum employee contribution
of 7%.

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 employees who are eligible pursuant to their collective bargaining agreement
and  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 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 $23,670 and
$30,709  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 $112 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  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,  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.  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 $5,435,792 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 the  Preferred  Stock Fund - During 2004,  in an effort to allow
participants  greater  investment  flexibility,  the  Preferred  Stock  Fund was
liquidated.  Proceeds paid to participants  were  transferred from the Preferred
Stock Fund to the Vanguard  Retirement Savings Trust. The funds were immediately
eligible to be transferred to other funds in the Plan.


                                       6



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,  4,157  participants  held 51,154 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
$5,217,742,  which  included  a premium  of  $102,308  .  KeySpan  paid  accrued
dividends through July 29, 2004 of $127,031 ($2.4833 per share).

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 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.

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.


                                       7



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  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% or more of the Plan's assets available as
of December 31, 2004 and 2003:




                                                                                                2004                  2003
                                                                                                             
        KeySpan Stock Fund -
          *KeySpan Common Stock Fund, 2,735,067 and
            2,587,302 units, respectively**                                                 $107,460,796           $94,876,360
        Common and Collective Trust -
           Vanguard Retirement Savings Trust, 129,180,320
           and 117,802,011 shares, respectively**
                                                                                             129,180,320           117,802,011
        Mutual Funds:
           Vanguard PRIMECAP Fund, 1,543,747 and                                              96,175,465            80,773,101
            1,522,871 shares, respectively**
           Vanguard 500 Index Fund, 383,394 and                                               42,802,064            36,936,510
            359,760 shares, respectively**
           Vanguard Windsor Fund, 2,217,722 and                                               40,074,242            35,086,969
            2,157,870 shares, respectively**
           Vanguard Windsor Fund II, 1,425,877 and                                            43,817,191            34,918,418
             1,318,174 shares, respectively**
           Vanguard Explorer Fund, 404,994 shares**                                           30,200,399                     -

         * 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
$42,202,444 as follows:

         KeySpan Common Stock                                                                                      $7,088,767
         KeySpan Preferred Stock                                                                                      102,300
         Mutual Funds                                                                                              35,011,377
                                                                                                                --------------
         Net Appreciation of Investments                                                                          $42,202,444
                                                                                                                ==============




                                       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:                                                  $94,876,360


          Changes in assets:
             Net appreciation in fair value of investment                                                   7,088,767
             Dividend income                                                                                4,648,120
             Employer contributions                                                                         3,156,835
             Participant contributions                                                                      6,143,682
             Participant loan repayments                                                                    3,909,956
             Net assets transferred in (out)                                                                (303,195)
             Benefits paid to participants                                                                (3,686,621)
             Participant loan withdrawals                                                                 (3,266,142)
             Transfers to participant-directed investments                                                (5,106,966)
                                                                                        ------------------------------

          Net change                                                                                       12,584,436
                                                                                        ------------------------------



          KeySpan Common Stock fund - end of year:                                                       $107,460,796

                                                                                        ==============================



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 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 transaction 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.

At December 31, 2004 and 2003,  the Plan held  2,735,067  and  2,587,302  units,
respectively,  of KeySpan  Common Stock,  the sponsoring  employer,  with a cost
basis of  $84,947,866  and  $77,542,651,  respectively.  During  the year  ended
December 31, 2004, the Plan recorded dividend income of $4,648,120.


                                       10



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 a 2001  contribution for one employee of KeySpan
Home Energy Services New England on April 8, 2005 and certain 2002 contributions
for two employees of KeySpan Home Energy  Services New England on June 24, 2005.
These  contributions  totaling $319 were remitted  later than required by D.O.L.
Regulation  2510.3-102.  The Company forwarded additional funds in the amount of
$207 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 moved to Vanguard Retirement Savings
Trust V, which offers an expense ratio of 0.25%.

Effective May 1, 2005, 11 Algonquin  LNG, Inc.  management  employees  unionized
under Local 251 Teamsters.  The new union members will be given a match of $0.25
of each $1.00  that they  contribute  to the Plan,  up to a maximum of 6% of the
employee's compensation.


                                       11




KEYSPAN ENERGY 401(k) PLAN FOR UNION 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                        $84,947,866     2,735,067  $ 107,460,796
     American Funds Growth Fund of America             Mutual Fund                           **              264,813      7,247,940

     Vanguard Funds:
*    Vanguard Retirement Savings Trust                 Common Collective Trust               **          129,180,320    129,180,320
*    Vanguard PRIMECAP Fund                            Mutual Fund                           **            1,543,747     96,175,465
*    Vanguard 500 Index Fund                           Mutual Fund                           **              383,394     42,802,064
*    Vanguard Windsor Fund                             Mutual Fund                           **            2,217,722     40,074,242
*    Vanguard Windsor II Fund                          Mutual Fund                           **            1,425,877     43,817,191
*    Vanguard Total Bond Market Index Fund             Mutual Fund                           **            2,169,896     22,284,827
*    Vanguard LifeStrategy Moderate Growth Fund        Mutual Fund                           **            1,159,291     20,762,897
*    Vanguard Explorer Fund                            Mutual Fund                           **              404,994     30,200,399
*    Vanguard International Growth Fund                Mutual Fund                           **              540,028     10,184,922
*    Vanguard LifeStrategy Growth Fund                 Mutual Fund                           **              376,129      7,537,629
*    Vanguard LifeStrategy Conservative Growth Fund    Mutual Fund                           **              291,429      4,447,208
*    Vanguard Mid-Cap Index Fund                       Mutual Fund                           **              110,244      1,724,222
                                                                                                                          ---------
                                                                                                                        563,900,122

*    Participant loans receivable                      Participant loans (maturing 2005 to 2020 at                       27,604,842
                                                       interest rates of 5% to 11%)                                      ----------
                                                                                             **
     Total                                                                                                            $ 591,504,964
                                                                                                                      =============



*    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 UNION EMPLOYEES

Form 5500, Schedule H, Part IV, Line 4j -                                                                        Plan # 090528
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  $35,922,615.39                                 $35,922,615.39
The Vanguard Group Vanguard Retirement Savings Trust                  $24,544,305.82  $24,544,305.82  24,544,305.82              $ -
N/A                KeySpan Common Stock                17,703,992.71                                  17,703,992.71
N/A                KeySpan Common Stock                                12,208,324.16   10,291,081.14  12,208,324.16     1,917,243.02













                                       13


KEYSPAN ENERGY 401(k) PLAN FOR UNION EMPLOYEES



FORM 5500 SCHEDULE H, PART IV, LINE 4a -                                                                        Plan # 090528
DELINQUENT PARTICIPANT CONTRIBUTIONS                                                                            EIN # 11-3431358
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
                                                                                                                   
                                                                                                                         $319
KeySpan Corporation             Employer/Plan Sponsor             KeySpan  remitted to the trustee
                                                                  a 2001  contribution
                                                                  for one  employee  of  KeySpan
                                                                  Home  Energy  Services  New
                                                                  England  on April 8,  2005 and certain
                                                                  2002  contributions  for two
                                                                  employees  of KeySpan  Home Energy
                                                                  Services  New England on
                                                                  June 24, 2005.  These  contributions,
                                                                  totaling  $319,  were remitted later
                                                                  than required   by  D.O.L. Regulation
                                                                  2510.3-102.  The Company forwarded
                                                                  additional funds in the amount of
                                                                  $207 to compensate for  participants'
                                                                  lost earnings,  which were deposited
                                                                  in the employees' accounts.





                                       14




                                   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 29, 2005




                                       15