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, 2003 Commission Registrant; State of Incorporation; IRS Employer File Number Address; and Telephone Number Identification Number ----------- ----------------------------------- --------------------- 1-13739 UNISOURCE ENERGY CORPORATION 86-0786732 (An Arizona Corporation) One South Church, Suite 100 Tucson, AZ 85701 (520) 571-4000 Item 5. Other Events. --------------------- On August 26, 2003, UniSource Energy Corporation (UniSource Energy) filed a Current Report on Form 8-K describing in Item 2 thereof the completion of the purchase of the Arizona gas and electric system assets from Citizens Communication Company (Citizens) on August 11, 2003. As permitted by Item 7 of Form 8-K, historical financial statements were not included in the August 26th Form 8-K. Instead, the Form 8-K stated that historical financial statements would be filed, if required, within the time permitted by Item 7. UniSource Energy has determined that the assets acquired from Citizens were not significant within the meaning of Regulation S-X. Consequently, UniSource Energy will not be filing either financial statements for periods prior to August 11, 2003 of the business acquired or pro forma financial information. 2 SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. UNISOURCE ENERGY CORPORATION -------------------------------- (Registrant) Date: October 2, 2003 /s/ Kevin P. Larson -------------------------------- Kevin P. Larson Vice President and Principal Financial Officer 3