http://www.slate.com/articles/business/the_juice/2015/10/the_tennessee_valley_authority_is_closing_coal_plants_and_that_s_huge.html

The coal industry has entered a rough patch. Its largest customers—electricity producers—are systematically shutting down plants that use the material. Earlier this week, SNL Energy issued a report that boosted the amount of coal-fired electric capacity it estimated would be retired in 2015—from 12.3 gigawatts to 14.6 gigawatts, an increase of nearly 20 percent. The plants being retired this year represent about 5 percent of the total coal-generating capacity in the U.S.