The U.S. Army Corps of Engineers tapped ACCIONA Solar Power, a unit of Spain's Acciona SA, and Clark Energy Group to develop the project, which launched its first phase on Thursday. The project, located at the Army's largest training range in California's Mojave Desert, could grow as large as 1 gigawatt in the future. The facility at Fort Irwin will surpass the 14-MW solar plant at Nellis Air Force Base in Nevada as the U.S. Department of Defense's largest solar power plant. The new plant will have both photovoltaic solar panels and mirrors and turbines for concentrated solar power.