National Geographic : 2009 Sep
SunCatchers at Sandia National Laboratories in New Mexico stand dormant at moonrise. At daybreak each mirror array will turn sunward, and concentrated light will heat a Stirling engine held at the focal point, driving pistons and making electricity. No system is more efficient at converting photons to grid-ready AC power. Stirling Energy Systems plans to erect some 60,000 SunCatchers at desert sites near Los Angeles and San Diego.