The U.S. coal power plant fleet has been shrinking for years, with the official tally of coal plants closed exceeding those still open as of late last year. Another 43 gigawatts, or about 18 percent of the remaining 249 gigawatts of capacity, is expected to close by 2030. Absent “market interventions at a grand scale” — such as the Trump administration’s plan to force utilities to buy uncompetitive coal-fired power under the mandate of national security — the same trends are accelerating beyond current estimates, and could lead to the country’s coal fleet being nearly halved again by 2030.