A tough Supreme Court hearing brings little clarity on Line 5 pipeline’s fate
Grist
by Vivian LaFebruary 25, 2026
AI-Generated Deep Dive Summary
The U.S. Supreme Court recently heard arguments about whether state or federal courts will decide the fate of the controversial Line 5 pipeline in Michigan. The case, initiated by Michigan Attorney General Dana Nessel in 2019, aims to revoke the pipeline’s easement across the Straits of Mackinac due to environmental and safety concerns. Enbridge Energy, the Canadian company operating the pipeline, argues that the matter should be handled in federal court, as it involves international agreements and federal regulations. The justices acknowledged the significant implications for U.S.-Canada relations and treaty rights but focused on a procedural question: whether Enbridge missed the deadline to move the case to federal court due to “exceptional circumstances.” A decision is expected by summer 2024.
The Line 5 pipeline, operational since 1953, carries oil and natural gas liquids across 645 miles, with a critical segment under the Straits of Mackinac. Michigan’s attorney general argues that state courts are better suited to address issues related to public trust resources and environmental protection. Enbridge counters that federal jurisdiction is necessary to ensure compliance with pipeline safety regulations and international agreements. The pipeline’s shutdown has been supported by all 12 federally recognized tribes in Michigan, who view it as a threat to their treaty rights, waterways, and ways of life.
The justices’ questions highlighted concerns about delays in resolving the case if it
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Originally published on Grist on 2/25/2026