| http://www.w3.org/ns/prov#value | - Of the electricity generated in the United States in 2006, 70% was produced from fossil fuels (mainly coal and natural gas), almost 20% came from nuclear power, 7% from hydropower and 3% from other forms of renewable energy such as wind and solar energy. (Ref. http://en.wikipedia.org/wiki/Electricity_sector_of_the_United_States).
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