Nevada Solar One is a 64-megawatt solar thermal plant, using parabolic trough concentrators to heat a circulating oil to make steam, located in the El Dorado Valley, next to the Copper Mountain 1 and Copper Mountain 2 plants. It has been operating since 2007. There are also three important electrical substations in the valley, Edison’s El Dorado facility, and the Los Angeles Department of Water and Power’s McCullough and Marketplace substations.