The John E. Amos power plant is seen from a field outside of Winfield, W. Va., on Thursday night, Aug. 23, 2018. Built in the 1970's, the plant is the largest in the American Electric Power system. Many of AEP's smaller coal-fired power plants in Appalachia closed in response to environmental regulations such as the Clean Power Plan in 2015. (Craig Hudson/Charleston Gazette-Mail via AP)