| http://www.w3.org/ns/prov#value | - existing technologies, like passive solar, across the U.S. The Solar Energy Research Institute was designated as a national laboratory of the U.S. Department of Energy in September 1991, at which time its name was changed to NREL. Today it serves as the country???s primary laboratory for renewable energy and energy efficiency research and development, including solar, wind, geothermal and fuel ce
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