The Government Accountability Office released a report November 28 finding that power plants that account for 15 to 18 percent of the coal’s coal-fired electric generating capacity are expected to be retired by 2020. The report, Significant Changes Are Expected in Coal-Fueled Generation, but Coal is Likely to Remain a Key Fuel Source, concluded that coal plants will be retiring in part because fracking operations have lowered natural gas prices and because Environmental Protection Agency air regulations will require the installation of pollution controls. The retiring plants are older, smaller, and dirtier than those that will not be retired.