Mainline Optimization

Enbridge is working to optimize the Mainline pipeline system. The Mainline delivers crude to markets in Canada, as well as the U.S. Midwest and Gulf Coast.

The Mainline system starts at Edmonton, Alberta runs to the Canada-U.S. border at Gretna, Manitoba. In the U.S. it continues until it reaches Superior, Wisconsin.

The Mainline optimization work involves identifying opportunities, using the pipeline system’s existing infrastructure, to transport an additional 400,000 barrels per day of oil to the best refining markets in North America. This work is being advanced over phases, referred to as the Mainline Optimization Phase 1 and Mainline Optimization Phase 2 projects, or collectively, the Mainline Optimization Program.

The goal of the Mainline Optimization Program is to increase deliveries of Canadian oil to refining markets in the U.S. Midwest and Gulf Coast.

This program has the potential to help enable greater North American energy affordability and economic prosperity.

Mainline Optimization Phase 1

Enbridge is currently working on executing the first phase of the Mainline optimization work, which involves adding 150,000 bpd of the potential 400,000 bpd to the Mainline through the use of system optimizations and enhancements.

This work involves the use of drag-reducing agents, new piping configurations and crossovers, and storage capacity, and terminal improvements. It will largely take place on Enbridge property and involve upgrades to existing pipelines and infrastructure.

We anticipate bringing this additional capacity into service starting in 2027.

Mainline Optimization Phase 2

Enbridge continues to advance the Mainline Optimization Phase 2 project, which could involve adding another 250,000 bpd of transportation capacity as early as the end of 2028.

This potential project would involve optimizing and enhancing existing pipelines and terminals on the Mainline pipeline system. This work would largely take place on Enbridge property. Some of this potential work would include:

Pipelines and facilities (Edmonton, AB to Flanagan, IL)

• Optimization and enhancement work would be undertaken on several pipelines and facilities in Canada and the U.S. which would include the use of drag-reducing agents, as well as pumping and equipment upgrades.

Terminal (Cromer, MB)

• As part of the project’s pipeline optimization and enhancement work, upgrades would be required at the Cromer Terminal, which would include the addition of storage tanks, the installation of new terminal piping, electrical upgrades and other related work.