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PRIMM, NV - FEBRUARY 27: (L-R) NRG Energy senior controls engineer Philip Spinks, operations consultant Ron York and BrightSource Energy technician Carl Maassberg monitor a workstation in the control room of the Ivanpah Solar Electric Generating System on February 27, 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)