Enbridge selects contractors for Straits of Mackinac pipeline tunnel project

After a roughly three-year wait for a critical state permit, Enbridge’s Great Lakes Tunnel and Pipe Replacement project for its Line 5 pipeline across the Straits of Mackinac in Michigan has taken a step forward. The Army Corps of Engineers’ permits for the tunnel project would seem to be the only major obstacle standing in the way of construction, but there may well be more challenges ahead. Like a few other oil and gas projects — namely, Mountain Valley Pipeline (MVP) and Dakota Access Pipeline (DAPL) — Line 5 has become entangled in controversy, including local opposition worried that a spill would irreparably damage their surroundings and spoil the state’s natural resources. In today’s RBN blog, we take a closer look at the Line 5 project, its next steps, and the opposition it continues to encounter. 

For 65 years, Enbridge’s Line 5 has been a critically important conduit for moving Western Canadian and Bakken crude oil and NGLs east across Michigan’s upper and lower peninsulas and into Ontario, where the now-540-Mb/d pipeline feeds Sarnia refineries and petrochemical plants. Some crude from Line 5 also can flow east from Sarnia to Montreal refineries on Line 9. But Enbridge has been under increasing pressure to shut down Line 5 over concern that a rupture under the Straits of Mackinac might cause major environmental damage. At long last, the state of Michigan and Enbridge have reached an agreement to replace the section of Line 5 under the straits by the mid-2020s, and to take steps in the interim to enhance the existing pipeline’s safety. In today’s blog, we consider the significance of the Enbridge pipeline and of the newly reached accord.