Exhibit 99(a)





                                    TXU CORP.
                       Certificate Pursuant to Section 906
                         of Sarbanes - Oxley Act of 2002
                CERTIFICATION OF SECRETARY & ASSISTANT TREASURER
                                       AND
                               PLAN ADMINISTRATOR

         The  undersigned,  Peter  B.  Tinkham,  Secretary  &  Assistant
Treasurer  of  TXU  Corp.,  and  Plan Administrator of the TXU Deferred and
Incentive Compensation Plan (the "Plan"), DOES HEREBY CERTIFY that:

         1.   The Annual Report on Form 11-K for the year ended March 31,
              2003 (the "Report") of the Plan 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
              operation of the Plan.

     IN WITNESS WHEREOF, the undersigned has caused this instrument to be
executed this 30th day of June, 2003.





                                 /s/ Peter B. Tinkham
                           -------------------------------------
                        Name:    Peter B. Tinkham
                        Title:   Secretary & Assistant Treasurer
                                 Plan Administrator,
                                 Organization and Compensation Committee









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