Utility Dive, Apr. 24, 2014, by Claire Cameron.

"Coal power was the backbone of American industry for the last 100 years. But by 2020, the U.S. Energy Information Administration (EIA) predicts that about 60 gigawatts (GW) of coal-fired capacity will be retired. That's 6.2% of all U.S. capacity, according to calculations based on NERC data."