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Last month, for the first time in the U.S., solar generated more electricity than coal, a reflection of both the rapid adoption of renewable power and the declining fortunes of America’s aging fleet of coal power plants.

Solar output reached an all-time high last month, supplying 12.8 percent of U.S. electricity, with coal supplying 12.2 percent, according to an analysis from energy think tank Ember. As a share of the power supply, solar typically reaches a high in May, when longer days spur greater generation, but mild weather keeps demand in check.

Coal output continued to slump last month, reaching a new record low, according to Ember. Its decline comes despite a push by the Trump administration to extend the lives of aging coal plants. Just this week, Energy Secretary Chris Wright issued an emergency order to keep a coal power plant in Orlando, Florida, online.…