Michigan Reassesses Enbridge Line 5 Tunnel Project Permits

en.Wedoany.com Reported - On September 9, Michigan Governor Gretchen Whitmer and Phil Roos, director of the Michigan Department of Environment, Great Lakes, and Energy (EGLE), announced that the state government will reassess the relevant permits issued in July of this year for the Enbridge Great Lakes Tunnel Project to determine the impact of a recent Michigan Supreme Court ruling on the existing approvals. The project proposes to build a tunnel beneath the lakebed of the Straits of Mackinac to house a replacement segment of the Line 5 oil pipeline.

On July 15, EGLE reissued the project's permits under Part 303 wetland protection and Part 325 Great Lakes submerged lands of the Natural Resources and Environmental Protection Act. The permits previously issued in 2021 were set to expire in 2026 because construction had not yet begun. The reissuance followed an approximately 16-month review by EGLE and an assessment of the project's impacts on approximately 0.018 acres of lakebed area near McGulpin Point on the south side and approximately 1.53 acres of wetland near Point La Barbe on the north side.

The project also requires a separate National Pollutant Discharge Elimination System (NPDES) permit. Enbridge has applied to discharge treated construction wastewater, groundwater seepage, pressure test water, and up to 5 million gallons per day of non-contact cooling water into Lake Michigan during tunnel construction and operation; the public comment period for the permit reissuance process ended on June 30, and the relevant documents remain in the state-level approval process.

The Great Lakes Tunnel Project is planned to replace the dual-pipe segment of Line 5 currently laid on the lakebed of the Straits of Mackinac. The existing pipeline has been in operation for approximately 73 years. On August 12, the U.S. Army Corps of Engineers issued a key federal permit and record of decision for the project, providing a federal-level approval basis for tunnel construction; state-level wetland, submerged lands, and other permits remain subject to separate Michigan regulatory procedures.

On September 9, Whitmer also asked Enbridge to study alternatives to shutting down the existing underwater segment of Line 5 before the tunnel is completed. The current reassessment targets the project permits already issued by the state government; the July permits remain valid for now, and subsequent handling will depend on the state government's completion of legal and environmental reviews based on the Supreme Court ruling.