Arizona Public Service Company, a subsidiary of Pinnacle West Capital Corporation, generates, transmits, and distributes electricity via a mix of energy sources that includes coal, nuclear, gas, oil, and solar facilities, predominantly in Arizona. Their transmission and distribution facilities cover over 17,000 miles of both overhead and underground lines, in addition to owning over 475 substations and 6,323 megawatts of generation capacity. The company serves approximately 1.3 million customers and was established in 1985, headquartered in Phoenix, Arizona.