Coal-fired electricity generating capacity in the United States is retiring, as tighter air emission standards and decreased cost-competitiveness relative to other power resources make coal-fired power plants less economical. From 2011 to mid-2020, 95 gigawatts (GW) of coal capacity was closed or switched to another fuel and another 25 GW is slated to shut down by 2025, based on information power plant operators reported to the U.S. Energy Information Administration (EIA). The closures will decrease the capacity of the U.S. coal fleet to less than 200 GW, more than one-third lower than its peak of 314 GW in 2011. As the coal-fired fleet is retired and remaining plants are utilized less, plant owners are evaluating new operating models, such as seasonal operation.
Source: As U.S. coal-fired capacity and utilization decline, operators consider seasonal operation – Today in Energy – U.S. Energy Information Administration (EIA)