Michigan Supreme Court Overturns Permit for Enbridge Line 5 Tunnel, Citing Environmental Law Violations

The Michigan Supreme Court has overturned a key state permit for Enbridge's proposed Line 5 oil pipeline tunnel beneath the Straits of Mackinac. The court ruled that the Michigan Public Service Commission (MPSC) failed to comply with the Michigan Environmental Protection Act (MEPA) and its obligations under the public trust doctrine when it approved the permit in 2023. This decision sends the permit back to the MPSC for further review and is considered a significant legal victory for Tribal Nations and environmental advocates seeking to protect the Great Lakes.