In March 2025, Enbridge Inc. announced a major Mainline Capital Investment Program—a C$2 billion upgrade to North America’s largest crude oil pipeline network, with investments planned through 2028. The Mainline system is the backbone of Canadian oil exports, moving about 3 million barrels per day (bpd) from Edmonton, Alberta, to refineries in eastern Canada and the U.S. Midwest. 
The upgrades are designed to maximize existing steel-in-the-ground, targeting incremental capacity gains and improved utilization, rather than building new mainline segments. The project could enable up to 1500,000 bpd of additional throughput (300,000 bpd in future expansions) via pump upgrades and flow optimization.
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