Trans Mountain Mainline Optimization Project

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The Trans Mountain Mainline Optimization Project would add approximately 360,000 barrels per day of oil capacity by building 11 new pump stations (5 within Alberta), expanding 9 pump stations (4 within Alberta), and adding approximately 30 kilometres of new 36-inch pipe between Darfield and McLure, BC. Upon completion the pipeline will support the movement of 1,250,000 barrels per day.

The project is expected to cost between $3 billion to $4 billion, and is pending a final investment decision.

Municipality:	Edmonton, Edson, Improvement District No. 12 Jasper Park, Jasper, Parkland County, Spruce Grove, Stony Plain, Stony Plain 135, Strathcona County, Wabamun, Yellowhead County
Sector:	Pipeline
Schedule:
Estimated Cost:	$4.0B
Stage:	Proposed Projects are proposed from the time they are announced to the start of construction. For substage fields, see our methodologies page.
Developer:	Trans Mountain Corporation
Project Website:	https://www.transmountain.com/optimization-projects
Related Links:	Nov 20, 2025 - The Globe and Mail