EXHIBIT 32.1

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

     In connection with the amended Quarterly Report of CenterPoint Energy
Resources Corp. (the "Company") on Form 10-Q/A for the period ended September
30, 2005 (the "Report"), as filed with the Securities and Exchange Commission on
the date hereof, I, David M. McClanahan, Chief Executive Officer, certify,
pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the
Sarbanes-Oxley Act of 2002, that, to the best of my knowledge:

     (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: January 10, 2006


                                        /s/ David M. McClanahan
                                        ----------------------------------------
                                        David M. McClanahan
                                        President and Chief Executive Officer