Pinnacle West Capital Corporation, through its subsidiary, Arizona Public Service Company, provides retail and wholesale electric services primarily in the State of Arizona. It engages in the generation, transmission, and distribution of electricity from coal, nuclear, gas, oil, and solar resources. The company offers electric service to approximately 1.1 million customers. It owns or leases approximately 6,370 megawatts of regulated generation capacity. The company was founded in 1920 and is headquartered in Phoenix, Arizona.