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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.

“It is the states — informed by federal, regional, and load-serving entities’ assessments of available supply and reliability needs — that bear the responsibility to plan for and avert reliability risks on an ongoing basis,” the court added, noting that the Michigan Public Service Commission and the Midcontinent Independent System Operator had approved the plant’s retirement after extensive reviews.

The suit was brought by Earthjustice, which represented the Sierra Club and Urban Core Collective. Also, the Michigan attorney general argued the case for Illinois, Michigan and Minnesota. Other petitioners included the Natural Resources Defense Council, Michigan Environmental Council, Environmental Defense Fund, Environmental Law and Policy Center, Vote Solar, the Ecology Center and the Union of Concerned Scientists.