The company suspended work on the project Wednesday as U.S. President Joe Biden cancelled a key presidential permit for the pipeline border crossing.
TC Energy had earlier warned that blocking the project would lead to the layoffs of thousands of union workers building the pipeline.
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The 1,947-kilometre pipeline is designed to carry 830,000 barrels a day of crude oil from Hardisty, Alta., to Steele City, Neb.
Some 200 kilometres of pipe have already been installed for the expansion, including across the Canada-U.S. border, and construction has begun on pump stations in Alberta and several U.S. states.
TC Energy announced a plan Sunday to eliminate the impact of greenhouse gas emissions from Keystone XL’s operations, even as its future appeared in doubt.