Crews are working to clean up a pipeline leak that has spilled at least 210,000 gallons of oil in South Dakota.
TransCanada has not given a reason for the incident, which occurred days before the Nebraska Public Service Commission was due to announce a decision on Keystone XL, a 830,000-barrel expansion through the state.
The company said crews were able to shut down the pipeline early Thursday morning and began investigating the leak. It was detected about 6 a.m. Thursday by TransCanada and reported to state officials more than four hours later, said Brian Walsh, a manager with the South Dakota Department of Environment and Natural Resources. State regulators have already granted construction permits for the pipeline. It would carry tar sands oil from Alberta, Canada to refineries on the Gulf Coast. The substance flowing through the Keystone pipeline is known as diluted bitumen, or "dilbit", because the bitumen (the crude oil itself) is so thick and sticky it must be diluted in order to effectively flow through the system.
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A leak and spill in southeastern South Dakota in April 2016 prompted a weeklong shutdown of the pipeline.
One of those leaks happened in southeastern North Dakota in May 2011, when 14,000 gallons spilled after a valve failed at a pumping station near the South Dakota border.
The Keystone XL pipeline got federal USA approval in March when President Donald Trump overturned former President Barack Obama's rejection of the project in 2015. An estimated volume of 5,000 barrels, or 210,000 gallons, leaked. The project and its route through Nebraska has been controversial.