TC Energy says combination of factors caused Keystone pipeline leak

TC Energy Corp. has pegged the cost of cleanup and remediation of December's oil spill from its Keystone pipeline at an estimated US$480 million.

The Keystone pipeline system suffered the worst oil spill in its history on Dec. 7, 2022 when oil leaked into a creek in Washington County, Kansas. 

The size of the spill was initially estimated at 14,000 barrels, though TC Energy revised that figure downwards Thursday to 12,937 barrels.

While most of the 4,324-kilometre pipeline system reopened a week after the spill, a 154-km section running from just south of Steele City, Nebraska to Cushing, Oklahoma remained shut down until the end of December.