Exhibit 99




                        UNISOURCE ENERGY CORPORATION


                        TUCSON ELECTRIC POWER COMPANY

                            _____________________


                      STATEMENTS OF CORPORATE OFFICERS
         (Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002)

                            _____________________

     Each of the undersigned, James S. Pignatelli, Chairman of the Board,
President and Chief Executive Officer of UniSource Energy Corporation and
Tucson Electric Power Company (each a "Company"), and Kevin P. Larson, Vice
President, Treasurer and Chief Financial Officer of each Company, hereby
certifies, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that
each Company's 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, as amended, and that the information contained therein
fairly presents, in all material respects, the financial condition and
results of operation of such Company.


March 10, 2003

                                 /s/  James S. Pignatelli
                                 --------------------------------
                                      James S. Pignatelli
                                  Chairman of the Board, President
                                     and Chief Executive Officer
                                   UniSource Energy Corporation
                                   Tucson Electric Power Company


                                 /s/  Kevin P. Larson
                                 --------------------------------
                                      Kevin P. Larson
                                  Vice President, Treasurer and
                                     Chief Financial Officer
                                  UniSource Energy Corporation
                                  Tucson Electric Power Company