Exhibit 99.2

                            CERTIFICATION PURSUANT TO
                              U.S.C. SECTION 1350,
                       AS ADOPTED PURSUANT TO SECTION 906
                        OF THE SARBANES-OXLEY ACT OF 2002

     In connection with Annual Report of KeySpan Corporation (the "Corporation")
on Form 10-K for the year ended  December 31, 2002 as filed with the  Securities
and Exchange  Commission on the date hereof (the "Report"),  I, Gerald Luterman,
Executive  Vice  President  and  Chief  Financial  Officer  of the  Corporation,
certify,  pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906
of the Sarbanes-Oxley Act of 2002, that:

     (1) The Report fully  complies  with the  requirements  of Section 13(a) or
15(d) of the Securities Exchange Act of 1934, amended; and

     (2)  The  information  contained  in the  Report  fairly  presents,  in all
material  respects,  the  financial  condition  and results of operations of the
Corporation.


                                            /s/ Gerald Luterman
                                            -------------------
                                            Name: Gerald Luterman
                                            Title: Executive Vice President and
                                            Chief Financial Officer
                                            Date: March 6, 2003



Note: A signed  original of this written  statement  required by Section 906 has
been provided to KeySpan Corporation and will be retained by KeySpan Corporation
and  furnished  to the  Securities  and  Exchange  Commission  or its staff upon
request.