Current Report
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): February 27, 2007

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

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

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

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

o  Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
 
 
Item 2.02 Results of Operations and Financial Condition
 
On February 27, 2007, UniSource Energy Corporation (“UniSource Energy”) issued a press release announcing earnings for the year ended December 31, 2006 for UniSource Energy and Tucson Electric Power Company. A copy of the press release is attached hereto as Exhibit 99.
 
Item 9.01 Financial Statements and Exhibits
 
Exhibit 99        UniSource Energy Corporation Press Release, dated February 27, 2007
 
 
 
 

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: February 27, 2007
 
 
UNISOURCE ENERGY CORPORATION
——————————————————
(Registrant)
 
 
/s/ Kevin P. Larson
 
 
——————————————————
Senior Vice President and Principal
Financial Officer
 
Date: February 27, 2007
 
 
TUCSON ELECTRIC POWER COMPANY
——————————————————
(Registrant)
 
 
/s/ Kevin P. Larson
 
 
——————————————————
Senior Vice President and Principal
Financial Officer