World marketed energy consumption was about 524 quadrillion British thermal units (Btu) in 2011.1 The commercial sector, industrial sector, residential sector, and transportation sector are the four major energy end-use sectors. The electric power sector also consumes energy. The electricity produced by the electric power sector is consumed by the other end-use sectors. There are

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In 2014, the United States generated about 4,093 billion kilowatthours of electricity.1  About 67% of the electricity generated was from fossil fuels (coal, natural gas, and petroleum). Major energy sources and percent share of total U.S. electricity generation in 2014: Coal = 39% Natural gas = 27% Nuclear = 19% Hydropower = 6% Other renewables =

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