Exhibit 32.2


                              CERTIFICATION OF THE
              EXECUTIVE VICE PRESIDENT AND CHIEF FINANCIAL OFFICER
                             PURSUANT TO SECTION 906
                        OF THE SARBANES-OXLEY ACT OF 2002


In  connection   with  the  Quarterly   Report  of  KeySpan   Corporation   (the
"Corporation") for the quarter ended March 31, 2004 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, as amended; and

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



                                         /s/ Gerald Luterman
                                         -------------------
                                         Name: Gerald Luterman
                                         Title: Executive Vice President and
                                                Chief Financial Officer
                                         Date: April 30, 2004