Enbridge Application for Line 5

On April 17, 2020, Enbridge Energy, Limited Partnership (Enbridge) filed an application with the Michigan Public Service Commission (MPSC or Commission) pursuant to Public Act 16 of 1929, MCL 483.1 et seq, also referred to as Act 16, requesting authority to replace and relocate the segment of Line 5 crossing the Straits of Mackinac into a tunnel beneath the Straits of Mackinac.

What does Enbridge's Act 16 application seek approval for? 

The application seeks approval for Enbridge's project known as the Straits Line 5 Replacement Segment Project, which will replace the current crossing - consisting of two, 20” inch diameter pipes referred to as the Dual Pipelines – with a single, 30-inch diameter pipe (the replacement pipe segment) located within a concrete-lined tunnel below the lakebed of the Straits. This application does not request approval of the tunnel itself, which is the subject of separate applications addressed by other state and federal agencies. The application states that Enbridge has acquired the necessary property rights for installation, operation, and maintenance of the replacement pipe segment. 

 For an overview of the Act 16 process, click here.

In conjunction with its application seeking authority for Act 16 approval, Enbridge requested that the Commission issue a declaratory ruling pursuant to Section 63 of the Administrative Procedures Act of 1969 (being MCL 24.263), and Rule 448, (being R 792.10448) or other finding, that Enbridge already has obtained the authority it needs from the Commission for the project for the reasons set forth in the application.

For an overview of the declaratory ruling request, click here

Why is Enbridge filing an Act 16 application with the Michigan Public Service Commission?

Siting authority for crude oil and petroleum product pipeline siting is granted to the MPSC pursuant to Act 16. Approval under Act 16 allows the applicant to construct the pipeline as specified in the Commission order.

U-20763 Case Information

U-20763 Enbridge Act 16 Application Case Docket



April 20, 2020 - Notice of Commission Meeting

Significant Upcoming Dates

May 13, 2020 - Written comments on Enbridge Energy's request for declaratory ruling due

May 27, 2020 - Replies to comments regarding the declaratory ruling request due

Press Releases

April 22, 2020 - MPSC establishes comment period on Enbridge Energy's application for Line 5 tunnel project in Straits of Mackinac

Commission Orders

April 22, 2020 - Establishing a period for comment on Enbridge's application

How to Participate

The MPSC provides many opportunities for the public to participate in cases. Customers, business owners, non-profit organizations, and others may share their views by becoming an intervenor, attending and speaking at a Commission meeting or public hearing, providing written comments, or writing a letter to the Commission. For an overview of the Act 16 process and how to participate, click here. You can also monitor the case using the instructions below to receive updates about notices, public hearings, and opportunities to comment. 

Case Monitoring - All non-confidential documents filed in this case are available to the public. You can access case information through the docket for Case No. U-20763. If you'd like to receive notifications when new filings are made, click on the orange "Notify Me of New Approved Filings" box within the docket.

Written comments - Interested persons may submit comments to the Commission regarding your position on this case without being an official party or intervenor. Comments may be submitted at any point during the proceeding and will be filed in the docket for Case No. U-20763 and subject to review by the public and the Commission. Comments can be submitted via email to mpscedockets@michigan.gov or by mail to: Michigan Public Service Commission, 7109 W. Saginaw Highway, Lansing, MI 48917.  Please be sure to include Case No. U-20763 in your comments. 


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