First Solar has completed its first 10-MW ground-mounted photovoltaic power plant for Sempra Generation near Boulder City, NV, a project said to be the largest thin-film solar power plant in North America. Under the terms of a 20-year power purchase agreement with the El Dorado Energy subsidiary of Sempra, Pacific Gas and Electric will buy the solar-generated electricity produced by the plant, with first power deliveries expected by Jan. 1.