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 on Form 10-Q for the period ended
March 31, 2006 of KeySpan  Corporation  (the  "Corporation"),  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.



Date:       May 4, 2006


                                                  /s/ Gerald Luterman
                                                  -------------------
                                                  Gerald Luterman
                                                  Executive Vice President
                                                  and Chief Financial Officer