TransCanada said on Tuesday that as a result of a power disruption, the flow of oil through the Keystone system will be temporarily reduced.
Two large tornadoes passed close to its Stanton pump station, located near the town of Pilger, Nebraska, TransCanada said in an email.
A swarm of tornadoes, some appearing two at a time, struck several farming communities in northeastern Nebraska on Monday.
"There is no damage to our pipeline and related facilities,'' company spokesman Shawn Howard said.
Oil market intelligence firm Genscape earlier reported that flow decreased to near 442,000 bpd from an estimated 581,000 bpd since Monday.
The Keystone Pipeline System is a 2,639-mile pipeline system that transports crude oil from Hardisty, Alberta, to markets in the American Midwest and the U.S. Gulf Coast, according to the company website.
— By Reuters