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Pinnacle West Capital Corporation is an energy-focused utility holding company headquartered in Phoenix, Arizona. The company primarily operates through Arizona Public Service Company, a vertically integrated electric utility that provides regulated retail and wholesale electricity to residential, commercial, and industrial customers across central and southern Arizona. Pinnacle West Capital Corporation’s core activities span electricity generation, transmission, and distribution, using a diverse mix of nuclear, natural gas, coal, oil, and solar resources, complemented by energy storage facilities and extensive overhead and underground line networks. Through its subsidiaries, including Arizona Public Service Company, El Dorado Investment Company, and Pinnacle West Power, LLC, the company also holds debt and minority interests in energy-related and Arizona community-based ventures, and develops and operates transmission infrastructure in the western United States. Founded in 1985 and based in Phoenix, Pinnacle West Capital Corporation plays a central role in supplying essential electric services within Arizona’s regulated utilities sector.