Michigan Supreme Court Deals Major Blow to Line 5 Tunnel Project

August 8th, 2026· 0:58

The Michigan Supreme Court has nearly unanimously overturned a key permit connected to Enbridge's proposed Line 5 tunnel beneath the Straits of Mackinac, sending the project's environmental review back to state energy regulators. The Center Square reporter Elise Apel reports that the court ordered Michigan regulators to reconsider their environmental review. Environmental groups and Native American tribes have opposed the tunnel project since it was first proposed in 2018, while Enbridge has continued to pursue the infrastructure project. Plaintiffs welcomed the ruling, while Enbridge spokesperson Ryan Duffy said the company disagrees with the decision and is disappointed by the additional delay. The company said the project has already been under review for nearly a decade and that it is reviewing the court's opinion while assessing its legal options. The ruling creates another major hurdle for a controversial energy infrastructure project with implications for Michigan's energy supply, environmental policy, regulatory costs, and future infrastructure development. #Line5 #Michigan #MichiganSupremeCourt #Enbridge #StraitsOfMackinac #Energy #EnergyInfrastructure #Pipelines #MichiganNews #Infrastructure #EnvironmentalReview #GreatLakes #BreakingNews #Politics #CenterSquare