The Copper Mountain Solar Facility is a 802 megawatt (MWAC) solar photovoltaic power plant in Boulder City, Nevada, United States. The plant was developed by Sempra Generation. When the first unit of the facility entered service on December 1, 2010, it was the largest photovoltaic plant in the U.S. at 58 MW. With the opening of Copper Mountain V in March 2021, it again became the largest in the United States. It is co-located with the 64 MW Nevada Solar One, 150 MW Boulder Solar, and 300 MW Techren Solar projects in the Eldorado Valley, thus forming a more than 1 gigawatt (GW) solar generating complex. By comparison, generating capacity at the nearby Hoover Dam is about 2 GW.

Boulder City is a city in Clark County, Nevada, United States. It is approximately 26 miles (42 km) southeast of Las Vegas. As of the 2020 census, the population of Boulder City was 14,885. The city took its name from Boulder Canyon. Boulder City is one of only two places in Nevada that prohibits gambling, the other being the town of Panaca.