Line 5 and the Great Lakes Tunnel


Welcome to Enbridge's Line 5 landing page, with information on our $500-million Great Lakes Tunnel Project in the Straits of Mackinac as well as our existing Line 5 pipeline in Michigan.

Explore this resource to find out operational and project details, separate fact from fiction, ask questions, and learn more about our ongoing investment in communities across Michigan.

You can also find out more about the suite of safety precautions we take to protect Michigan’s waters—while also ensuring an uninterrupted supply of reliable, affordable energy that Michigan needs.

Line 5 in the news
Gov. Whitmer ‘assaults Canada and the Midwest economy’

May 21, 2021: ‘No mode of moving energy is risk-free, but pipelines are much safer than rail,’ writes the Wall Street Journal’s editorial board.

Analysis: Line 5 shutdown would cost the region $20B+

May 10, 2021: CEA warns Whitmer’s “reckless” move would put 33,000+ jobs in peril.

‘Shutting down Line 5 would inflict significant hurt’

May 17, 2021: Former U.S.-Canada ambassadors David Jacobson and Gary Doer warn of a "similar disruption" to Colonial.

The need for Line 5
Without Line 5?
Job losses. Propane shortages. A $5-billion hit to the regional economy. And a threat to energy security.
Line 5 and the Great Lakes Tunnel: Virtual Open House

Learn more about the Great Lakes Tunnel Project and the benefits of Line 5.

Our Enbridge Line 5 Virtual Open House offers a variety of videos, animations and interactive opportunities. This experience provides information on our Great Lakes Tunnel Project—to be bored deep under the Straits of Mackinac, housing a replacement segment of Line 5—as well as the multiple safety measures we take to ensure safety in the Straits.
Great Lakes Tunnel Project
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A $500M private investment in Michigan
As an extra layer of safety, the tunnel will house a replacement segment of Line 5 bored deep under the Straits of Mackinac.
Vital energy infrastructure
Line 5 and the Great Lakes Tunnel: Voices of support

Enbridge stands ready to build an underground tunnel to house Line 5, deep under the Straits of Mackinac.

We believe our Great Lakes Tunnel Project is the best way to ensure continued energy supply in Michigan. We’re not alone. Public support for our Line 5 tunnel plan has come from elected officials, policy experts, business owners and leaders, and media columnists—from Michigan and elsewhere.
Safety in the Straits
A suite of safety precautions
Zero incidents at the Straits in 65+ years. We're keeping it that way with 24/7 vigilance.
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Project information and updates
Latest marine technology protects the Straits

March 10, 2020: Enbridge completes installation of Guardian solution, ready for spring

Enbridge federal court case receiving widespread support

May 12, 2021: Government, business, labor from Michigan, Canada, the region submit "friend-of-the-court" briefs.