Pinnacle West Capital Corporation is an electric utility holding company. The Company operates through its subsidiary, Arizona Public Service Company (APS). It is engaged in regulated retail and wholesale electricity businesses and related activities, and includes electricity generation, transmission, and distribution. It owns or leases approximately 6,257 megawatts (MW) of regulated generation capacity and holds a mix of both long-term and short-term power purchase agreements (PPAs) for additional capacity. Its portfolio includes biomass, biogas, coal, energy storage, geothermal, natural gas, solar, and wind. It includes natural gas power plants located throughout Arizona, consisting of Redhawk, located near Palo Verde; Ocotillo, located in Tempe; Sundance, located in Coolidge; West Phoenix, located in southwest Phoenix; Saguaro, located north of Tucson; and Yucca, located near Yuma. It also includes oil-only power plants, which include Douglas and Yucca GT-4.