The Palo Verde Generating Station is a nuclear power plant located near Tonopah, Arizona, in western Arizona. It is located about 45 miles (72 km) west of downtown Phoenix. Palo Verde generates the largest amount of electricity in the United States per year, and it is the second largest electrical generating facility in terms of capacity. It is a critical asset to the Southwest, generating approximately 32 million megawatt-hours annually. As of 2013, the Palo Verde Generating Station was the largest power plant in the United States by net generation. Its average electric power production is about 3.3 gigawatts (GW), and this power serves about four million people. The Arizona Public Service Company (APS) operates and owns 29.1% of the plant. Its other major owners include the Salt River Project (20.2%), the El Paso Electric Company (15.8%), Southern California Edison (15.8%), PNM Resources (7.5%), the Southern California Public Power Authority (5.9%), and the Los Angeles Department of Water and Power (5.7%). APS was granted a 20-year license extension to operate through 2045 for Unit 1, 2046 for Unit 2, and 2047 for Unit 3, with the option to submit a subsequent license renewal application for extended operation. The Palo Verde Generating Station is located in the Arizona desert and is the only large nuclear power plant in the world that is not located near a large body of water. The power plant evaporates the water from the treated sewage from several nearby cities and towns to provide the cooling of the steam that it produces.