April 5, 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:
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[ ]     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)

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     N/A______________________________________________________________
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     to Exchange  Act Rule 0-11 (set forth the amount on which the filing fee is
     calculated and state how it was determined):
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(4)  Proposed maximum aggregate value of transaction:
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[ ]  Fee paid previously with preliminary materials.




[ ]  Check box if any part of the fee is offset as provided by Exchange Act Rule
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The  following  communication  is being  distributed  to all  National  Grid and
KeySpan  employees  through internal email system and will be posted on National
Grid and KeySpan websites:


Integration update                  National Grid             KeySpan


Volume I Issue III                                             April 2006


April 5, 2006


National Grid - KeySpan Integration Team Announced


The following is a message from Kwong Nuey and John  Caroselli,  National Grid -
KeySpan Integration leads:


We are  pleased  to  announce  the  functional  integration  team leads who will
spearhead our efforts going forward. They are:

   Functional Team                      National Grid            KeySpan
   ---------------                      -------------            -------

o  Human Resources                      Bill Dowd                Bill Bollbach
o  Gas Operations                       Jim Howe                 Bill Akley
o  Generation & Energy Supply           Lee Klosowski            Rich Rapp
o  Shared Services                      Mike Kyle                Coleen Ceriello
o  Electric T&D Operations              Clem Nadeau              TBD(1)
o  Customer Service & Marketing         Tony Pini                Rick Murphy
o  Finance & Accounting                 Marcy Reed               Mike Taunton
o  Corporate Services                   John Sherman             Mike Walker
o  Information Technology               TBD(2)                   Frank LaRocca

In addition to the outstanding team identified above, Colin Owyang from National
Grid and Tom Dargan from KeySpan will join the team to assist in the  management
and coordination of  integration-related  project  planning,  strategy,  content
integration, logistics and information management; also Amy Atwood from National
Grid and  Mary  Cardillo  from  KeySpan  will  join  the  team to  champion  our
communications efforts.

The  integration  teams will formally begin the process later this month.  Their
first task will be to map the current "as is"  environments  for both companies.
This "level setting" will establish the baseline for integration in the tasks to
follow.  In  addition  to  leading  the  charge  for the  integration  of  their
respective  functional  areas,  the  functional  team  leads  will  also  act as
designated  points of contact  for all  integration-related  activities  between
National Grid and KeySpan personnel.  In that regard,  should you have a need to
engage your counterparts please contact the functional leader for your area.


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We know you will join us in offering  the entire  team your  support and wishing
them every success as we begin the journey to combine these two great companies.
If you have any  questions,  please  feel free to contact  either of us directly
(see below); through the Integration Hotlines at 1-800-523-1044  (National Grid)
or 1-888-698-4397 (KeySpan); or via e-mail at  IntegrationQuestions@us.ngrid.com
or IntegrationQuestions@keyspanenergy.com.

Thank you,

/s/Kwong Nuey                                      /s/John Caroselli

Kwong Nuey                                         John Caroselli
National Grid Integration Lead                     KeySpan Integration Lead
kwong.nuey@us.ngrid.com                            jcaroselli@keyspanenergy.com
- -----------------------                            ----------------------------


1.   The KeySpan Electric T&D Operations lead will be appointed next week.

2.   As Kathy Lane,  the newly  announced  National  Grid group CIO, will not be
     starting in the US until April 10th,  we have  deferred the IT  appointment
     until April 14th.












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

KeySpan intends to file with the Securities and Exchange  Commission (the "SEC")
a proxy  statement and other relevant  documents in connection with the proposed
acquisition  of KeySpan by National  Grid.  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  most recent proxy  statement and Annual
Report on Form 10-K (filed with the SEC on March 30, 2005 and February 28, 2006,
respectively)  and will be set  forth in the  proxy  statement  relating  to the
acquisition when it becomes available.




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