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Renewable Resource Data Center
This U.S. Dept. of Energy-sponsored resource contains data relating to natural energy sources such as solar radiation, biomass, geothermal, and wind power. There's an illustrated glossary of alternative energy-related terms, and links to projects and information for students and teachers. Consumers preparing to install solar panels can estimate their savings by using the "PVWatts" link, which calculates the electricity produced by any photovoltaic solar system.
http://rredc.nrel.gov/

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