A shutdown of Line 5 would cut Michigan’s primary crude and propane supply, raising prices and forcing Enbridge to seek costly alternatives. The region would also face logistical and environmental risks.
What Line 5 does for Michigan
Line 5 transports up to 540,000 barrels of crude and natural‑gas liquids each day from western Canada to refineries near Sarnia, Ontario. About 65 % of Michigan’s propane comes from the pipeline, and the refined products feed U.S. markets.
Immediate impact on fuel supply
Refineries would have to slow or reroute production, which could lift propane and gasoline prices, especially in the Upper Peninsula where most residents rely on propane for heating. Some farms and manufacturers would face delays in receiving fuel.
Enbridge’s financial consequences
Enbridge would likely trigger contract penalties for failing to deliver scheduled volumes. While Line 6B can absorb some flow, it cannot replace the full capacity of Line 5, and no immediate replacement exists.
Environmental and Safety concerns
The Straits of Mackinac are a sensitive marine corridor. A rupture here could spread oil over hundreds of miles of shoreline, and no proven cleanup method exists for submerged oil in these conditions.
Alternative transport options
Rail can move oil but at higher cost and with greater accident risk. Trucks are expensive for long distances, and the Great Lakes are not suited for large marine tankers. A shift to rail would require many more trains than the pipeline currently moves.
Long‑Term outlook and contingency planning
Michigan has no strategic petroleum reserve, making it vulnerable to supply shocks. A future tunnel proposal could secure the line, but it would take years to complete and would not address an immediate shutdown. Diversifying transport routes and building local storage are the most realistic short‑term solutions.
FAQs
- Is Line 5 the only pipeline crossing the Great Lakes? No, but it is the most critical for Michigan’s propane supply.
- Has Line 5 ever leaked in the Straits? No spill has been recorded there, but nearby lines have experienced significant ruptures.
- Who regulates Line 5? The Pipeline and Hazardous Materials Safety Administration at the federal level, with Michigan asserting state authority under an easement.