While environmental regulations and cheap natural gas have worked together to kill off coal in the United States, coal is not dead yet. The rapidly unfolding shale gas revolution brought prices down so significantly in recent years that natural gas began to capture market share from coal in a meaningful way. In particular, coal’s share dropped from 42% in 2011 to 37% in 2012. There were even moments in time in 2012 when both fuels were making up equal percentages of the electric power sector.

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