The use of coal to produce electricity in this country is diminishing. The US Department of Energy reported that more electricity came from natural gas than from coal in April 2015. This is a first (most likely an anomaly as opposed to the new normal, but nonetheless a first). Coal still accounts for more electricity generation annually, but this one-month victory for natural gas is a big deal. Coal accounted for 50% of all electricity generated in the US as recently as 2000. In the Short Term Energy Outlook for July 2015, "EIA forecasts coal's share of U.S. total generation will average 35.6% in 2015, down from 38.7% in 2014. In contrast, the natural gas fuel share averages 30.9% this year, up from 27.4% in 2014."
An article in Slate Magazine that is certainly worth reading characterized things quite well. It said that "Coal Is Losing the War on Coal." Between cheap natural gas, ever-cheaper solar and wind power, and new environmental regulations governing power plants, coal's market share will continue to go down.