The US Energy Information Administration has said that most coal plants are either coming into compliance with mercury rules or they are retiring their older coal units that are too expensive to retrofit. From December 2014 until June 2016, coal-fired capacity fell from 299,000 megawatts to 276,000 megawatts. Coal-fired generation's share of total electricity generation fell from 39 percent in 2014 to 28 percent in the first four months of 2016, it adds.
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