The three solar thermal power plants that make up the 4,000 acre Ivanpah SEGS near Primm, Nevada, on February 20, 2014. #

One of the Ivanpah SEGS towers, surrounded by thousands of mirrors mounted on heliostats, in the Mojave Desert, on February 20, 2014. #

Heliostats at the Ivanpah SEGS, seen from above in front of the Clark Mountain Range in California's Mojave Desert, on March 3, 2014. #

Mirrors at the Ivanpah SEGS facility, photographed on February 20, 2014. #

Mirrors on heliostats at the Ivanpah SEGS facility, photographed on February 20, 2014. #

A heliostat with two mirrors reflects other heliostats at the Ivanpah SEGS, on February 27, 2014. #

An air-cooled condenser housing giant fans, seen beneath a solar receiver and boiler on top of a tower at the Ivanpah SEGS on February 27, 2014. #

Workers monitor plant operations in the control room of the Ivanpah SEGS on February 27, 2014 in the Mojave Desert in California. #

A monitor in the control room of the Ivanpah SEGS displays steam cycle data, on February 27, 2014. #

Vehicles travel on a road between rows of heliostats at the Ivanpah SEGS, on March 3, 2014. #

Some of the 173,500 heliostats installed in the Mojave Desert at the Ivanpah SEGS, on March 3, 2014. #

Two of the three units at the Ivanpah SEGS, operating on March 3, 2014. #

A solar receiver and boiler on top of a tower at the Ivanpah SEGS, in an aerial view on February 20, 2014. #

An air-cooled condenser and a solar receiver and boiler on top of a tower, at the Ivanpah SEGS on March 3, 2014. #

Reflected sunlight is directed onto a solar receiver and boiler on top of a tower at the Ivanpah SEGS, on March 3, 2014. #

One of the three power plants at the Ivanpah SEGS, photographed on February 20, 2014. #

An aerial view of the 4,000 acre Ivanpah Solar Electric Generating System, seen in an aerial view above California's Mojave Desert, on February 20, 2014. #