Pinnacle West Capital Corporation, through its subsidiary, Arizona Public Service Company, provides retail and wholesale electric services primarily in the state of Arizona. The company generates, transmits, and distributes electricity using coal, nuclear, gas, oil, and solar generating facilities. Its transmission facilities consist of approximately 6,192 pole miles of overhead lines and approximately 49 miles of underground lines; and distribution facilities comprise approximately 11,191 miles of overhead lines and approximately 22,092 miles of underground primary cable. The company serves approximately 1.3 million customers. It owns or leases approximately 6,316 megawatts of regulated generation capacity. The company was incorporated in 1985 and is headquartered in Phoenix, Arizona.