The Sandpiper pipeline is a 616-mile (991 km) long underground oil pipeline project for light crude oil from the Bakken oil fields in Northwest North Dakota, through Minnesota, to end in Superior, Wisconsin, which Enbridge Energy Partners, and Williston Basin Pipe Line LLC, an indirect subsidiary of Marathon Petroleum Corporation corporation are planning. Enbridge has estimated the pipeline will cost about $2.6 billion.The project was made public by the media in 2013, and informational hearings for landowners took place in three North Dakota towns during March 2014. The North Dakota Public Service Commission approved the pipeline on 25 June 2014. The Minnesota Public Utilities Commission unanimously approved the Sandpiper pipeline, but its decision was overturned in September 2015.