The Ivanpah Solar Electric Generating System is a solar thermal power station in the California Mojave Desert, 40 miles (64 km) south west of Las Vegas, with a planned gross capacity of 392 megawatts. The £1.5 billion facility consists of three power plants with mirrors that focus sunlight on to boilers at the top of the towers, creating steam which drives turbines generating enough electricity to power 140,000 California homes.