UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                    FORM 8-K

                                 CURRENT REPORT
                     PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                                 DATE OF REPORT
               (DATE OF EARLIEST EVENT REPORTED): August 11, 2005


                                                            IRS Employer
Commission     Registrant; State of Incorporation;          Identification
File Number    Address; and Telephone Number                Number
-----------   ----------------------------------------      -------------------

1-13739        UNISOURCE ENERGY CORPORATION                 86-0786732
               (An Arizona Corporation)
               One South Church Avenue, Suite 100
               Tucson, AZ 85701
               (520) 571-4000

1-5924         TUCSON ELECTRIC POWER COMPANY                86-0062700
               (An Arizona Corporation)
               One South Church Avenue, Suite 100
               Tucson, AZ 85701
               (520) 571-4000

     Check the appropriate box below if the Form 8-K filing is intended to
simultaneously satisfy the filing obligation of the registrant under any of the
following provisions:

     |_| Written communications pursuant to Rule 425 under the Securities Act
(17 CFR 230.425)

     |_| Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17
CFR 240.14a-12)

     |_| Pre-commencement communications pursuant to Rule 14d-2(b) under the
Exchange Act (17 CFR 240.14d-2(b))

     |_| Pre-commencement communications pursuant to Rule 13e-4(c) under the
Exchange Act (17 CFR 240.13e-4(c))





Item 8.01 - Other Events.

On August 11, 2005, Tucson Electric Power Company's (TEP) 380 megawatt
Springerville Generating Station Unit 2 (Springerville Unit 2) was taken out of
service due to a control system malfunction and subsequent mechanical problem
with the turbine. TEP has determined that one row of turbine blades was damaged
and will need to be replaced. Replacement blades are now being machined by the
manufacturer. The exact length of the outage has not been determined but based
on current information, TEP expects Springerville Unit 2 to be returned to
service sometime during the week of September 4, 2005.

TEP has contracted to purchase replacement power in the market to meet its
retail load requirements during the Springerville Unit 2 outage, which is
estimated to increase costs by approximately $500,000 per day. TEP's retail
rates are currently capped therefore none of these replacement power costs can
be passed through to retail customers. The repair costs are expected to be less
than $1 million.

Item 7.01 - Regulation FD Disclosure.

Although the total financial impact of the Springerville Unit 2 outage cannot be
determined at this time, UniSource Energy Corporation (UniSource Energy) expects
the costs of the outage to result in reduced 2005 full-year earnings. UniSource
Energy is currently unable to determine whether 2005 full-year earnings will be
within the previous estimated range of $1.50 and $1.75 per basic share.








                                   SIGNATURES




                                                                
            Pursuant to the requirements of the Securities Exchange Act of 1934,
each registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.



 
Date: August 22, 2005             UNISOURCE ENERGY CORPORATION
                                  ------------------------------------
                                          (Registrant)


                                      /s/ Kevin P. Larson
                                  ------------------------------------
                                     Vice President and Principal
                                          Financial Officer


Date: August 22, 2005             TUCSON ELECTRIC POWER COMPANY
                                  ------------------------------------
                                          (Registrant)


                                     /s/ Kevin P. Larson
                                  ------------------------------------
                                     Vice President and Principal
                                          Financial Officer