Mainline System
Project information
As at 31 December 2025
Description
As at 31 December 2025
Common carrier system comprising the Canadian Mainline and the US Lakehead System, operated and expanded since 1949; six adjacent pipelines connect with the Lakehead System at the Canada/US border plus five pipelines delivering into eastern Canada. Tolled under the Mainline Tolling Settlement through end-2028 (CER-approved March 2024) with an 11%-14.5% return collar on deemed 50% equity; ~70% of deliveries tolled under the settlement. Lakehead tolls FERC-regulated under the November 2023 Lakehead System Settlement. Effectively fully utilized in 2025. Mainline Capital Investment of up to US$1.3 billion through 2028 announced in 2025; Mainline Optimization Phases 1 and 2 advancing.
Processing facilities
As at 31 December 2025
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