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 engages in the generation, transmission, and distribution of electricity using coal, nuclear, gas, oil, and solar generating facilities. Its transmission facilities include overhead lines and underground lines; and distribution facilities, as well as owns and maintains transmission and distribution substations. The company was incorporated in 1985 and is headquartered in Phoenix, Arizona.