The U.S. Energy Information Administration reported 88 percent of coal-fired power plants (by capacity) in the country was built between 1950 and 1990.
Half of the coal capacity uses bituminous coal, which is the most abundant type of coal in the United States and typically mined in Appalachian states. The rest use sub-bituminous coal, which is produced in the western states and generally has a lower sulfur content than bituminous coal.
Less than five percent of operating coal capacity uses lignite or other coal types.
Average annual net generation from coal-fired units reached an annual high of 2 billion kilowatthours in 2007 and has since fallen to 1.2 billion kilowatthours in 2016.
Twelve states have less than 1 GW of coal capacity, including Maine and Vermont with no coal facilities at all.