Home / Environment / Enbridge offers 2024 finish for Great Lakes tunnel project

Enbridge offers 2024 finish for Great Lakes tunnel project

The Mackinac Bridge spans the Straits of Mackinac. (AP Photo/Carlos Osorio, File) (AP Photo/Carlos Osorio, File)

The Mackinac Bridge spans the Straits of Mackinac. Enbridge Inc. says it’s setting a firm deadline for completing a proposed oil pipeline tunnel beneath a key Great Lakes channel linking Lake Huron and Lake Michigan. The Canadian company says it has pledged to Michigan Gov. Gretchen Whitmer that the tunnel under the Straits of Mackinac would be in service by early 2024.  (AP Photo/Carlos Osorio, File)

Associated Press

TRAVERSE CITY, Mich. (AP) — Enbridge Inc. said Thursday it could have a proposed oil-pipeline tunnel built and operating beneath a crucial Great Lakes channel by early 2024, responding to demands from Michigan officials to expedite the shutdown of existing twin pipelines.

The Canadian company said it had sent Gov. Gretchen Whitmer a revised timeline for drilling the $500 million tunnel through bedrock beneath the Straits of Mackinac, the 4-mile-wide channel linking lakes Huron and Michigan.

“Assuming we are able to move through the permitting process without delay, we believe the tunnel can be under construction in 2021 and in service as soon as early 2024,” Enbridge said in a statement. “As previously committed, operation of the current Line 5 would cease immediately following the placement into service of the replacement pipeline in the tunnel.”

Company and state officials previously have said it could take seven to 10 years to complete the project but described 2024 as a target date after a deal was reached last year with former Republican Gov. Rick Snyder’s administration.

The letter to Whitmer, a Democrat, represents a firm pledge to meet the shorter schedule, said the company spokesman Michael Barnes.

Whitmer criticized Snyder’s agreement with Enbridge during her successful election campaign last fall. Earlier this year, she ordered work on the project halted and requested an opinion on its legality from he newly elected Attorney General Dana Nessel, who found that a law authorizing it violated the state Constitution.

Nessel said this week she would take steps in June to shut down the underwater pipelines if Whitmer and Enbridge could not agree on a new plan for decommissioning them.

The pipes are part of Enbridge’s Line 5, which carries 23 million gallons of crude oil and natural-gas liquids between Superior, Wisconsin, and Sarnia, Ontario.

Environmentalists are demanding an immediate shutdown, saying a rupture in the 66-year-old underwater segment could contaminate hundreds of miles of open waters and shorelines. Enbridge describes it as safe infrastructure that supplies essential propane for northern Michigan residents.

Asked on Thursday if the 2024 deadline was acceptable, Whitmer told reporters at the Detroit Regional Chamber’s Mackinac Policy Conference: “Well it certainly moved up, which tells me that perhaps we can make it ever better. We’re working on it.”

Whitmer said without a fixed date for shutting down Line 5, Nessel was likely to take legal action.

“I think going to court creates a lot of uncertainty,” Whitmer said. “We could be locked in litigation for a long time, and meanwhile the pipeline stays in the bottom of the water.”

According to Enbridge’s latest timeline, underwater rock and soil sampling would begin in June, followed by design work and the construction of a custom tunnel-boring machine in 2020.

Boring through bedrock and building the tunnel at an average of 40 feet a day would run from 2021 through 2023, and testing and commissioning would happen in early 2024.

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