August 15, 2008

UniSource Energy Declares Quarterly Dividend

The Board of Directors of UniSource Energy Corp. (NYSE: UNS) has declared a third quarter dividend for common shareholders of 24 cents per share. The dividend will be paid on September 5, 2008, to common shareholders of record as of August 25, 2008.

The declaration of dividend payments is at the board's sole discretion and subject to numerous factors that ordinarily affect dividend policy, including the results of UniSource Energy's operations and its financial position, as well as general economic and business conditions.

UniSource Energy's primary subsidiaries include Tucson Electric Power Company, which serves nearly 400,000 customers in southern Arizona; UniSource Energy Services, provider of natural gas and electric service for about 236,000 customers in northern and southern Arizona; and Millennium Energy Holdings, parent company of UniSource Energy's unregulated energy businesses. For more information about UniSource Energy and its subsidiaries, visit