Reuters Pictures
Bill Gross, CEO of eSolar, activates the solar panels as Lancaster, California mayor R. Rex Parris (L) and David Crane (R), President and CEO of NRG Energy watch the results on a screen at the opening of eSolar's first commercial power plant in the desert city of Lancaster August 5, 2009. NRG, whose mostly coal, natural gas and nuclear power plants generate enough electricity to serve 20 million U.S. households, already owns three land-based wind farms in Texas and earlier this year stepped into the solar arena through a $10 million investment with solar thermal startup eSolar.