In 2014, according to U.S. Energy Information Administration data, which of the following sources of energy contributed the largest share to U.S. electricity generation?

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According to the U.S. Energy Information Administration, natural gas contributed the largest share (27.2%) of U.S. electricity generation in 2014, followed closely by coal (39%). Petroleum (less than 1%) and hydropower (6.1%) contributed much smaller shares, while nuclear power provided 19.3% of electricity generation.

In 2014, According to U