Located in the Mojave Desert, 40 miles southwest of Las Vegas, the Ivanpah Solar Electric Generating System is the largest solar thermal energy facility in the world, with 392 MW of capacity – meaning it can produce enough renewable electricity to power nearly 100,000 homes. It uses 173,500 heliostat mirrors spread over approximately 3,500 acres, focusing solar energy on boilers located atop three solar power towers, generating steam to turn a conventional steam turbine. The facility is owned by NRG Solar, Google and BrightSource Energy. The Energy Department provided a $1.6 billion loan guarantee to the project. Pictured here is an aerial perspective of the nearly completed Ivanpah Solar Power Facility, taken in April 2013. | Photo courtesy of Gilles Mingasson/Getty Images for Bechtel.