NRG Solar owns 51% of the project which will supply electricity for 230,000 homes in nearby California at peak capacity. MidAmerican Solar, a unit of MidAmerican Energy Holdings Company, is minority owner.

The project uses First Solar’s thin-film solar panels.

Pacific Gas and Electric is buying Agua Caliente’s power under a 25-year agreement.

The project received a $967m loan guarantee from the US Department of Energy.