What is the Trans Mountain Expansion Project?

The Trans Mountain Expansion (TMX) project runs from Edmonton, Alberta, to the Westridge Marine Terminal and the Chevron refinery in Burnaby, British Columbia. It will twin an existing oil pipeline that was built in 1953.

TMX will:

  • create thousands of good, middle-class jobs
  • unlock new global markets to get a fair price for Canadian oil
  • generate billions of dollars in revenue each year to help fund clean energy solutions
  • help advance reconciliation with Indigenous peoples, including through economic opportunity
Map of the approved expansion of the Trans Mountain Pipeline
Text version Map of the approved expansion of the Trans Mountain Pipeline. This map shows the route of the Trans Mountain Pipeline Expansion Project from just east of Edmonton, Alberta, to Burnaby, British Columbia.

TMX involves building a new pipeline along the existing route. This will increase the pipeline’s capacity to 890,000 barrels per day from 300,000.

The project also expands the Westridge Marine Terminal by adding two berths. It increases the number of tankers that the terminal can handle per month to 34 from five. It will follow existing rights of way for 89 percent of its 1,147-kilometre length.

Construction is underway!

Pipeline construction in Greater Edmonton (Spread 1), which includes approximately 50 kilometres of pipeline running from Trans Mountain’s Edmonton Terminal in Sherwood Park to Acheson, Alberta, started in November 2019 and is now complete.

Find out more about building the pipeline

Explore the project further

History of the Trans Mountain pipeline

Find out more about the history of the Trans Mountain pipeline.


The Government of Canada now owns 100% of the existing Trans Mountain Pipeline and the expansion project.

Why expand the pipeline?

Find out how the Trans Mountain Expansion project benefits the economy, Indigenous groups and Canadians.

How decisions are made

Learn about the steps in the approval process before a final decision is made.

What we’ve done

See our previous consultations and actions on the expansion project.

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