Coal = 39%
Natural gas = 27%
Nuclear = 19%
Hydropower = 6%
Other renewables = 7%
Biomass = 1.7%
Geothermal = 0.4%
Solar = 0.4%
Wind = 4.4%
Petroleum = 1%
Other gases < 1%
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http://www.eia.gov/tools/faqs/faq.cfm?id=427&t=3
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