United States — Michigan Public Service Commission & Enbridge

United States — Michigan Public Service Commission: The commission's permit approval was vacated, and it must now conduct a broader review of the tunnel project's environmental impacts.

Enbridge: Enbridge is the owner of Line 5 and the proposed tunnel project. The court's decision vacates a key permit, delaying the project and adding regulatory uncertainty, though the existing pipeline continues to operate.

United States — Michigan Public Service Commission: Its permit approval was found erroneous by the state Supreme Court, requiring reconsideration.

Enbridge: Received the federal permit, advancing its tunnel project and reducing regulatory risk, though legal challenges remain.

United States — Michigan Public Service Commission: The MPSC's 2023 permit for the tunnel is being challenged before the United States — Michigan Supreme Court, with a decision expected soon.

Enbridge: Enbridge received key permits for its Line 5 tunnel project, advancing the project and reducing regulatory risk. The company faces ongoing litigation and must meet mitigation conditions.