Uns.com
About Uns.com
UniSource Energy's primary subsidiaries include Tucson Electric Power (TEP), which serves more than 397,000 customers in southern Arizona; and UniSource Energy Services (UES), a utility that delivers natural gas and electric service to more than 236,000 customers across Arizona. TEP, the second largest investor-owned electric utility in Arizona, is the principal operating subsidiary of UniSource Energy. Over 80 percent of TEP's energy needs are supplied by low-cost, coal-fired generating plants.
