July 10, 2006

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                            SCHEDULE 14A INFORMATION
                                 (Rule 14a-101)

                  Proxy Statement Pursuant to Section 14(a) of
            the Securities and Exchange Act of 1934 (Amendment No. )

Filed by the Registrant  [X]
Filed by a Party other than the Registrant  [ ]

Check the appropriate box:
[ ]     Preliminary Proxy Statement
[ ]     Confidential, For Use of the Commission Only (as permitted by
        Rule 14a-6(e)(2))
[ ]     Definitive Proxy Statement
[ ]     Definitive Additional Materials
[X]     Soliciting Material Pursuant to Section 240.14a-12

                              KeySpan Corporation
                              -------------------
                (Name of Registrant as Specified in Its Charter)

                                     (N/A)
                                     -----
    (Name of Person(s) Filing Proxy Statement, if Other Than the Registrant)

Payment of Filing Fee (Check the appropriate box):
[X]     No fee required.
[ ]     Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.

(1)  Title of each class of securities to which transaction applies:
     N/A______________________________________________________________

(2)  Aggregate number of securities to which transaction applies:
     N/A______________________________________________________________

(3)  Per unit price or other underlying value of transaction  computed  pursuant
     to Exchange  Act Rule 0-11 (set forth the amount on which the filing fee is
     calculated and state how it was determined):
     N/A______________________________________________________________

(4)  Proposed maximum aggregate value of transaction:
     N/A______________________________________________________________

(5)  Total fee paid:
     N/A______________________________________________________________





[ ]       Fee paid previously with preliminary materials.

[ ]       Check box if any part of the fee is offset as provided by Exchange Act
          Rule  0-11(a)(2)  and identify the filing for which the offsetting fee
          was  paid  previously.   Identify  the  previous  filing  registration
          statement number, or the Form or Schedule and date of its filing.

(1)  Amount Previously Paid:
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(2)  Form, Schedule or Registration Statement No.:
     N/A______________________________________________________________
(3)  Filing Party:
     N/A______________________________________________________________
(4)  Date Filed:
     N/A______________________________________________________________






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Attached is a copy of a press release issued by National Grid and KeySpan
Corporation.


nationalgrid                                                            KEYSPAN


                     NATIONAL GRID AND KEYSPAN CLEAR REVIEW
                       OF HART-SCOTT-RODINO WAITING PERIOD

Westborough,  MA and  Brooklyn,  NY (July 10, 2006) - National  Grid (LSE:  NG.,
NYSE:  NGG) and KeySpan  Corporation  (NYSE:  KSE) today  announced they cleared
review by the Federal Trade  Commission  under the  Hart-Scott-Rodino  Antitrust
Improvements Act, a requirement of their proposed merger.

Remaining   approvals  for  the  acquisition  include  clearance  under  foreign
investment laws;  authorization by the Federal Energy Regulatory  Commission and
by the New York Public Service Commission and the New Hampshire Public Utilities
Commission.

On February  27, 2006,  National  Grid and KeySpan  announced  an agreement  for
National  Grid to  acquire  KeySpan,  which will  materially  expand the size of
National Grid's US operations and create the  third-largest gas delivery utility
in the United States.  The acquisition is a natural extension of National Grid's
business and will result in electricity and gas businesses  serving nearly eight
million customers in the New York State and New England regions.

About National Grid:
- --------------------
National  Grid is an  international  energy  delivery  business  with  principal
activities in the regulated electricity and natural gas industries. In the U.S.,
National Grid transmits and distributes  electricity and natural gas to nearly 4
million  customers across 29,000 square miles of  Massachusetts,  New Hampshire,
New York and Rhode Island.

KeySpan  will be  National  Grid's  fifth  US  acquisition.  Previously,  it had
acquired New England Electric System and Eastern  Utilities  Associates  (2000),
and Niagara  Mohawk (2002).  Earlier this year,  National Grid announced that it
will  acquire the Rhode  Island gas  distribution  business  of  Southern  Union
Company.

The company owns the high-voltage  electricity  transmission  network in England
and Wales  and  operates  the  system  across  Great  Britain.  It also owns and
operates the high-pressure  gas transmission  system in Britain and, through its
natural gas  distribution  business  serves over 11 million  meters in homes and
businesses in Britain. In addition,  it has a number of businesses  operating in
related areas such as LNG importation, wireless infrastructure for broadcast and
telecommunications,   property,   metering   and   interconnectors.   For   more
information, visit National Grid's web site at www.nationalgrid.com.

                                     -more-


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National Grid/KeySpan File FERC Application (cont.)
Pg 2.

About KeySpan:
- --------------
A member of the Standard & Poor's 500 Index,  KeySpan Corporation  (NYSE:KSE) is
the fifth  largest  distributor  of  natural  gas in the  United  States and the
largest  in the  Northeast,  operating  regulated  gas  utilities  in New  York,
Massachusetts,  and New  Hampshire  that  serve  2.6  million  customers.  These
customer-focused businesses are complemented by a portfolio of service companies
that  offer  energy-related  products,  services,  and  solutions  to homes  and
businesses.  KeySpan is also the largest  electric  generator in New York State,
with approximately 6,650 megawatts of generating capacity that provides power to
1.1 million  customers of the Long Island Power Authority  (LIPA) on Long Island
and supplies approximately 25 percent of New York City's capacity needs. KeySpan
also operates  LIPA's  transmission  and  distribution  system under contract to
LIPA. In addition to these assets, KeySpan has strategic investments in pipeline
transportation,  distribution, storage, and production. KeySpan has headquarters
in Brooklyn, New England, and Long Island. For more information, visit KeySpan's
web site at www.keyspanenergy.com.


Media Contacts:

National Grid
Alberto Bianchetti
315-428-6932

Jackie Barry
508-389-3298

KeySpan
718-403-2503
24-hour pager: 516-824-1241






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Additional Information and Where to Find It
- -------------------------------------------

KeySpan intends to file with the Securities and Exchange  Commission (the "SEC")
a definitive proxy statement and other relevant documents in connection with the
proposed  acquisition  of KeySpan by National Grid. We filed  preliminary  proxy
statements  with the SEC on April 28,  2006,  June 15,  2006 and June 29,  2006.
Investors  and  security  holders  of  KeySpan  are  advised  to read the  proxy
statement and other relevant documents when they become available,  as they will
contain  important  information  about the  transaction.  Investors and security
holders may obtain a free copy of the proxy  statement and other documents filed
by KeySpan with the SEC,  when they become  available,  at the SEC's web site at
http:/www.sec.gov.

KeySpan  and  its  directors,  executive  officers  and  other  members  of  its
management and employees may be deemed to be participants in the solicitation of
proxies from its security  holders in connection with the proposed  acquisition.
Information   concerning  the  interests  of  KeySpan's   participants   in  the
solicitation  is set forth in KeySpan's  Annual  Report on Form 10-K (filed with
the SEC on  February  28,  2006),  Quarterly  Report on Form 10-Q for the period
ended March 31, 2006, KeySpan's preliminary proxy statements (filed with the SEC
on April 28, 2006, June 15, 2006 and June 29, 2006) and will be set forth in the
definitive  proxy  statement   relating  to  the  acquisition  when  it  becomes
available.








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