There are nearly 114 gigawatts (GW) of solar installed in the U.S., enough to power 21.8 million homes. Over the last decade, the solar market in the United States has grown at an average rate of 42% each year. There are more than 3 million individual solar installations in the U.S., ranging from small home rooftop systems to large utility-scale systems that add hundreds of megawatts of clean electricity to the power grid.