2010 was a banner year for the solar energy market in the United States. In contrast to U.S. GDP growth of 2.8%, the U.S. solar market grew 67% in value in 2010. Not only did the market expand greatly, but it showed substantial diversity across market segments, geography, and technologies. Solar is growing quickly across the U.S. at the residential, commercial, and utility scale levels. It is powering and heating buildings in all fifty states, and using a variety of technologies to do so.

http://www.seia.org/galleries/pdf/SMI-YIR-2010-ES.pdf