The Michigan Supreme Court granted two applications for leave to appeal a February 2025 Court of Appeals decision affirming the Michigan Public Service Commission’s conditional approval of an application by Enbridge Energy Limited Partnership (Enbridge) to replace and relocate a portion of its Line 5 fuel pipeline to a tunnel beneath the Straits of Mackinac. In its order granting an application filed by Tribes and environmental organizations, the Supreme Court indicated it would consider whether the Court of Appeals erred by (1) “applying a deferential standard of review rather than determining de novo whether the proposed conduct will pollute, impair, or destroy the air, water, or state’s other natural resources or the public trust in these resources under … the Michigan Environmental Protection Act” and (2) “affirming the Michigan Public Service Commission’s limitation on the scope of the evidence to be reviewed regarding its determinations under … MEPA and its decision to exclude evidence of the history and risk of oil spills along the entire length of Line 5 in those determinations.” In the order granting a water issues-focused environmental organization’s application, the Supreme Court indicated it would consider common-law public trust doctrine issues.

Challenge to order approving Enbridge Energy, Limited Partnership’s application to replace and relocate a segment of the Line 5 oil pipeline crossing the Straits of Mackinac. 

In re Application of Enbridge Energy to Replace & Relocate Line 5 (Little Traverse Bay Bands of Odawa Indians v. Michigan Public Service Commission)

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Michigan Supreme Court to Hear Appeals of Decision Upholding Approval of Line 5 Fuel Pipeline

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United States of America

Michigan

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Michigan Supreme Court to Hear Appeals of Decision Upholding Approval of Line 5 Fuel Pipeline

Risk

Fossil fuel

Economic sector