National Renewable Energy Laboratory (NREL)

http://www.nrel.gov
NREL’s Clean Energy 101 page provides extensive information on energy efficiency and renewable energy for the public, private and residential sectors. NREL’s mission is to lead the nation toward a sustainable energy future by developing renewable energy technologies, improving energy efficiency, advancing related science and engineering and facilitating commercialization. The site also offers links to newsletters, conferences, and a renewable resource data center.