EXHIBIT 99.1 - Officer Certification

                CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,
                    AS ADOPTED PURSUANT TO SECTION 906 OF THE
                           SARBANES-OXLEY ACT OF 2002

         Each of the undersigned hereby certifies, to the best of his knowledge
         in his capacity as an officer of NRG Energy, Inc., ("the Company"), for
         purposes of 18 U.S.C. Section 1350, as adopted pursuant to Section 906
         of the Sarbanes-Oxley Act of 2002 that the Annual Report on Form 10-K
         for the year ended December 31, 2002 fully complies with the
         requirements of Section 13(a) of the Securities Exchange Act of 1934
         and that the information contained in such report fairly presents, in
         all material respects, the financial condition and results of
         operations of the Company.

                                       NRG ENERGY, INC.
                                       ----------------
                                       (Registrant)

                                       /s/ RICHARD C. KELLY
                                       --------------------
                                       Richard C. Kelly
                                       President and Chief Operating Officer

                                       /s/ WAYNE H. BRUNETTI
                                       ---------------------
                                       Wayne H. Brunetti
                                       Chairman and Chief Executive Officer
Date March 31, 2003

    The foregoing certification is being furnished solely pursuant to 18 U.S.C
Section 1350 and is not being filed as part of the Report or as a separate
disclosure document.

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