The U.S. DOE Energy Efficiency and Renewable Energy Web site provides information on energy efficiency and renewable energy technologies.
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Alternative Energy (78)
Alternative Fuels (16)
Battery Technology (4)
Biodiesel Fuel (27)
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Electric Cars (24)
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Energy Conservation (25)
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Free Energy (9)
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Human Power (17)
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Ocean Energy (7)
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Sustainability (18)
Technology (10)
Tidal Energy (3)
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Wave Power (11)
Wind Energy (37)