Crude prices in North Dakota’s Bakken shale region have surged to their highest levels in about six months as producers in the region rein in output and amid doubt over the fate of the Dakota Access Pipeline, the main artery running oil out of the region.

North Dakota is the second only to Texas in terms of U.S. oil producing states, with about 1.2 million bbl/d of output. Harsh weather in the region is restraining production and well completion, which had already been hampered by poor demand in 2020 caused by coronavirus.

Concern about how U.S. President Joe Biden’s administration will handle the Dakota Access Pipeline (DAPL), which can transport more than 550,000 bbl/d out of the Bakken, is also boosting prices.

The possibility that the line could be shut down is prompting some producers to ask for higher premiums for their oil, fearing buyers may renege on agreements, dealers said.

Crude output in North Dakota is still about 20% lower than the historic high of 1.5 million bbl/d hit in late 2019. While production from wells more than one year old has recovered, output from newer wells has not, because of a lower rate of completions.

Bakken crude in Clearbrook, Minnesota strengthened to trade just 35 cents under benchmark futures on Tuesday, the strongest since early August, dealers said.

The state’s rig count has been flat at around 11 since October, according to Baker Hughes data. Output is expected to slide by nearly 20,000 bbl/d, the biggest decline since May, to about 1.2 million bbl/d in February, according to the U.S. Energy Information Administration.

Prices have risen in part due to the frigid temperatures that have plunged below 0 F in recent days. Cold weather can cause equipment to freeze and cut production further, traders said.

Meanwhile, DAPL has been embroiled in legal battles over the past five years, and faces new threats from the Biden administration. The latter has already taken several steps to restrict new oil and gas development, though it has not yet tried to shut a pipeline currently in operation.

DAPL’s operator, Energy Transfer, is arguing in court that the line should be kept open even as the U.S. Army Corps of Engineers undertakes a new review of the impact of the line's passage under Lake Oahe, a key source of water for indigenous communities in the Dakotas.

“The barrels would still move by alternative means” if DAPL is shut during the review, Shirin Lakhani at Rapidan Energy Group, an energy consultancy in Bethesda, Maryland, said.

“This is more than enough to absorb the remaining barrels displaced by DAPL in the near-term, but it would add $5-$10 to transportation costs.”

A hearing scheduled for Feb. 10 in the U.S. District Court of the District of Columbia was postponed until April at the request of the Army Corps, the court said on Feb. 9.

The court, which threw out DAPL’s permit to cross Lake Oahe, had asked the Corps for an update on what it intends to do about the pipeline.

Onshore