EXHIBIT 99.1

        Certification Pursuant to Section 1350 of Chapter 63 of Title 18
                            of the United States Code

     I, Thomas M. O'Flynn, Chief Financial Officer of Public Service Enterprise
Group Incorporated, to the best of my knowledge, certify that (i) the Annual
Report of Public Service Enterprise Group Incorporated on Form 10-K for the year
ended December 31, 2002 (the "Periodic Report") fully complies with the
requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934
and (ii) the information contained in the Periodic Report fairly presents, in
all material respects, the financial condition and results of operations of
Public Service Enterprise Group Incorporated.

                                         /s/ Thomas M. O'Flynn
                                         ---------------------------------------
                                         Thomas M. O'Flynn
                                         Public Service Enterprise Group
                                           Incorporated
                                         Executive Vice President and Chief
                                         Financial Officer
                                         February 25, 2003