Exhibit 99(b)

                             TXU US HOLDINGS COMPANY
                       Certificate Pursuant to Section 906
                         of Sarbanes - Oxley Act of 2002
                         -------------------------------

     The undersigned, Michael J. McNally, Principal Financial Officer of TXU US
HOLDINGS COMPANY (the "Company"), DOES HEREBY CERTIFY that:

          1.   The Company's Current Report on Form 8-K related to Oncor
               Electric Delivery Company filed on August 23, 2002 (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.   Information contained in the Report fairly presents, in all
               material respects, the financial condition and results of
               operations of Oncor Electric Delivery Company.

     IN WITNESS WHEREOF, the undersigned has caused this instrument to be
executed this 23rd day of August, 2002.

                                   /s/  Michael J. McNally
                                 -----------------------------------------------
                                 Name:  Michael J. McNally
                                 Title: Principal Financial Officer