Massive Solar Electricity Plant Provides Power To California Homes

PRIMM, NV - MARCH 03: Two units at the Ivanpah Solar Electric Generating System are seen operating in the distance behind rows of heliostats and the tank area for a third unit's boiler operations on March 3, 2014 in the Mojave Desert in California near Primm, Nevada. The largest solar thermal power-tower system in the world, owned by NRG Energy, Google and BrightSource Energy, opened recently in the Ivanpah Dry Lake and uses 347,000 computer-controlled mirrors to focus sunlight onto boilers on top of three 459-foot towers, where water is heated to produce steam to power turbines providing power to more than 140,000 California homes. (Photo by Ethan Miller/Getty Images)