NPR reported a couple of days ago on a project taking place out in Nevada called Nevada Solar One. While its a solar parabolic trough of curved mirrors designed to concentrate the sun’s rays, the project will used a closed loop tube filled with special heat resistant transfer fluid that will be heated by the sun. The hot fluid, which can reach 700 degrees F., will be used to turn water into steam, which will turn a steam turbine to make electricity. When Nevada Solar One is completed, it should generate 64 megawatts of electricity, enough to power 40,000 homes in Las Vegas. By contrast, the largest photovoltaic array in the world, located in Germany, produces 10 megawatts of electricity.