Enbridge Inc. has announced a final investment decision for the first phase of the Mainline Optimization project (Mainline Optimization Phase 1, MLO1), which involves a strategic expansion of its heavy Canadian crude transport capacity to major US refining hubs. The investment amounts to $1.4bn and is expected to enter service in 2027.
The project will add 150,000 barrels per day (bpd) of capacity to the Mainline system and 100,000 bpd to the Flanagan South Pipeline (FSP). The move responds to growing demand for export capacity and strengthens the integration of Canadian crude flows into the US market, specifically in the PADD II (Midwest) and PADD III (Gulf Coast) refining regions.
Optimising existing infrastructure
The Mainline network expansion will rely on a set of upstream enhancements and terminal upgrades, without requiring major new routes. For the FSP, Enbridge plans to add pump stations and improve existing terminals. The project will also utilise available capacity on the Seaway Pipeline, connecting Cushing, Oklahoma to Houston, Texas.
Colin Gruending, Executive Vice President and President of the Liquids Pipelines division at Enbridge, stated that this project demonstrates “the competitive advantage of leveraging existing infrastructure to meet growing customer demand, while supporting long-term North American energy security and affordability.”
Commercial agreements securing profitability
MLO1 is backed by long-term take-or-pay contracts signed with shippers for full-path service from Edmonton, Alberta, to Houston. These agreements secure stable revenue flows for Enbridge and economically justify the investment.
During the open season process held earlier this year, most existing customers extended their contracts into the next decade. This contractual continuity reflects sustained interest in reliable and competitive export routes from Canada.
