UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549


                                    FORM 8-K


                             Current Report Pursuant
                          to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934



Date of report (Date of earliest event reported):       March 21, 2005


                               KEYSPAN CORPORATION
                               -------------------
             (Exact Name of Registrant as Specified in Its Charter)


                                    New York
                                    --------
                 (State or Other Jurisdiction of Incorporation)


       1-14161                                           11-3431358
       -------                                           ----------
(Commission File Number)                       (IRS Employer Identification No.)

175 East Old Country Road, Hicksville, New York               11801
  One MetroTech Center, Brooklyn, New York                    11201
  ----------------------------------------                    -----
  (Address of Principal Executive Offices)                 (Zip Code)

                            (631) 755-6650 (Hicksville)
                            (718) 403-1000 (Brooklyn)
                            -------------------------
              (Registrant's Telephone Number, Including Area Code)


                                       N/A

          (Former Name or Former Address, if Changed Since Last Report)





Cautionary Language Concerning Forward-Looking Statements
- ---------------------------------------------------------

     Certain statements contained herein are forward-looking  statements,  which
reflect  numerous  assumptions  and  estimates and involve a number of risks and
uncertainties.  For these statements, we claim the protection of the safe harbor
for  forward-looking  statements  provided by the Private Securities  Litigation
Reform Act of 1995.

     There are  possible  developments  that could  cause our actual  results to
differ  materially  from  those  forecast  or  implied  in  the  forward-looking
statements.   You  are   cautioned   not  to  place  undue   reliance  on  these
forward-looking  statements,  which  are  current  only  as of the  date of this
filing.  We  disclaim  any  intention  or  obligation  to update  or revise  any
forward-looking  statements,  whether  as a result  of new  information,  future
events or otherwise.

     Among the factors that could cause actual results to differ materially are:
general  economic  conditions,   especially  in  the  Northeast  United  States;
available sources and cost of fuel; volatility of energy prices in a deregulated
market  environment  as well as in the  source of  natural  gas and fuel used to
generate  electricity;  potential  write-down  of our  investment in natural gas
properties  when  natural  gas prices are  depressed  or if we have  significant
downward  revisions  in our  estimated  proved gas  reserves;  federal and state
regulatory  initiatives that increase competition,  threaten cost and investment
recovery,  and impact rate  structures;  our ability to successfully  reduce our
cost structures; implementation of new accounting standards; the degree to which
the we develop  unregulated  business  ventures;  as well as  federal  and state
regulatory  policies  affecting our ability to retain and operate those business
ventures; our ability to identify and make complementary  acquisitions,  as well
as the successful  integration of those  acquisitions;  inflationary  trends and
interest rates; and risks detailed from time to time in reports filed by us with
the Securities and Exchange Commission.




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Item 1.01         Entry into a Material Definitive Agreement
- ---------         ------------------------------------------

On March 21, 2005, KeySpan entered into a Supplemental  Remarketing Agreement to
the original Remarketing Agreement dated May 6, 2002 with J.P. Morgan Securities
Inc.  (the  "Remarketing  Agent") and JPMorgan  Chase Bank,  N.A.  regarding the
remarketing of $394.88 million  aggregate  principal  amount of its Senior Notes
due May 16, 2008 (the "Notes").

The  Supplemental  Remarketing  Agreement  provides,  among other things,  that,
subject to the terms and conditions and in reliance upon the representations and
warranties  set  forth  in the  Supplemental  Remarketing  Agreement,  that  the
Remarketing  Agent  agrees to use its  commercially  reasonable  best efforts to
remarket the aggregate  principal  amount, as the case may be, of the Notes at a
purchase  price  not less  than  100.25%  of a  calculated  purchase  price.  In
connection therewith, the registered holder or holders of the Notes agree to pay
to the  Remarketing  Agent a remarketing fee equal to an amount not exceeding 25
basis  points  (0.25%)  of  the  calculated   purchase  price.  A  copy  of  the
Supplemental  Remarketing  Agreement  is  attached  hereto as  Exhibit  99.1 and
incorporated by reference.

On March 21, 2005, KeySpan announced the successful  remarketing of the Notes. A
copy of the  related  press  release  issued by  KeySpan is  attached  hereto as
Exhibit 99.2 and incorporated by reference.

On March 24, 2005, KeySpan completed and closed the remarketing transaction.

Item 9.01         Financial Statements and Exhibits

   (c)   Exhibits.

         99.1     Supplemental Remarketing Agreement dated as of March 21, 2005.

         99.2     Press Release of the Company dated March 21, 2005.




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                                   SIGNATURES


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


                                            KEYSPAN CORPORATION

Dated: March 24, 2005                       By: /s/ John J. Bishar, Jr.
                                                -----------------------
                                                John J. Bishar, Jr.
                                                Executive Vice President,
                                                General Counsel & Chief
                                                Governance Officer











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                               INDEX TO EXHIBITS
                               -----------------


Exhibit No.        Exhibit                                                 Page
- -----------        -------                                                 ----

99.1               Supplemental Remarketing Agreement
                   dated as of March 21, 2005.                               6

99.2               Press Release of the Company dated March 21, 2005.        29






















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