LANSING, MI — The Michigan Supreme Court will review whether a lower court erred in upholding a state permit for a proposed billion-dollar oil tunnel under the Straits of Mackinac.

The state’s highest court agreed on Friday to hear an appeal from opponents to the Enbridge Line 5 tunnel project, who claim the Michigan Public Service Commission failed to fully consider environmental impacts when it approved a permit in 2023 .

The Sept. 19 decision breathes new life into a challenge filed by environmental groups and state tribal nations who argue the MPSC did not adequately consider the broader impacts of building more infrastructure for climate-warming fossil fuels.

Enbridge is attempting to build a 3.6-mile tunnel next to the Mackinac Bridge that would house a rebuilt section of its

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