Although coal-fired power plants have no mandatory retirement age, power plant owners and operators have reported to EIA that they plan to retire 28%, or 59 gigawatts (GW), of the coal-fired capacity currently operating in the United States by 2035. As of September 2021, 212 GW of utility-scale coal-fired electric-generating capacity was operating in the United States, most of which was built in the 1970s and 1980s, according to our Preliminary Monthly Electric Generator Inventory.