Tesoro Corporation is investing $35 million to expand crude oil capacity at its refinery in Mandan, North Dakota. The company will increase capacity from 58,000 barrels per day (BPD) to 68,000 BPD by the second quarter of 2012.

"Coupled with the 2010 acquisition of the Shell-branded wholesale supply contracts, which provide fuel for approximately 300 stations in the region, this expansion reflects Tesoro's commitment to grow our refining and marketing business in the Northern Great Plains," said Tesoro President and CEO Greg Goff. "This allows for further integration opportunities in our operations and capitalizes on the steadily increasing domestic crude supply from the Bakken area."

Tesoro will acquire the additional crude oil from increasing production in the Bakken Shale and Williston Basin areas.