The TMX pipeline project is the expansion of the currently operating TransMountain Pipeline running between Edmonton, AB and Burnaby, BC. by twinning the pipeline. If completed, the project will expand its capacity from 300,000 barrels per day to 890,000 barrels per day.

While the project was originally owned by Kinder Morgan, the Canadian Development Investment Corporation – owned by the canadian government – was made to buyout the pipeline when the project became contested by First Nations and supporters began a trade war between BC and Alberta. The NEB ended up withdrawing project approval on the basis Kinder Morgan had not consulted with First Nations. The Supreme Court has since made a ruling making it impossible for any further legal challenges against the pipeline, and construction has begun.