A federal appeals court on Friday vacated the U.S. Department of Energy’s emergency order requiring the owners of a coal-fired power plant in Michigan to delay its planned retirement, saying the move usurped state authority over generating resources.

“The federal government has, until now, issued stopgap generation orders in response only to transitory emergencies caused by war, extreme weather events, market manipulation, or unplanned, short-term unavailability of specific generation units,” the U.S. Appeals Court for the District of Columbia Circuit said in its ruling. 

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