TC Energy Corp. says it has restarted the section of the Keystone pipeline that was unaffected by last week's oil leak in Kansas.

The Calgary-based company says the restarted segment of pipeline extends from Hardisty, Alta., to Patoka, Ill.

The portion of the pipeline affected by the spill remains shut down.

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The Keystone pipeline suffered the worst leak in its history last week when about 14,000 barrels of oil spilled into a creek in Washington County, Kan.

The affected segment of pipeline remains shut down and crews are on scene working on cleanup efforts.

The company has said it will be conducting a full investigation, in co-operation with regulators, into the cause of the spill.