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  the  Quarterly   Report  of  KeySpan   Corporation   (the
"Corporation")  on Form 10-Q for the period  ended  March 31, 2003 as filed with
the Securities  and Exchange  Commission on the date hereof (the  "Report"),  I,
Robert B.  Catell,  Chairman  and Chief  Executive  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: May 1, 2003