07:45 AM EST, 11/14/2025 (MT Newswires) -- Enbridge ( ENB ) said Friday that it has reached a final investment decision on the Mainline Optimization Phase 1 project, with an estimated $1.4 billion capital cost, to increase its Canadian heavy oil deliveries to key refining markets in the US Midwest and Gulf Coast.

The company said the project is expected to increase the capacity of its Mainline network and Flanagan South Pipeline, or FSP. Plans for the Mainline include upstream optimizations and terminal enhancements, while the FSP will see terminal improvements and additional pump stations, Enbridge ( ENB ) added.

Enbridge ( ENB ) said it expects to complete the additional capacity of 150,000 barrels per day for the Mainline and 100,000 barrels per day for FSP in 2027.