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 TXU Energy Company
         LLC filed on or about November 21, 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 TXU
         Energy Company LLC.

         IN WITNESS WHEREOF, the undersigned has caused this instrument to be
executed this 21st day of November, 2002.


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