Calgary, Alberta-based Enbridge has been operating the pipeline, formally called Line 67, since 2010. The company upgraded its pumping stations in 2014 and 2015 to nearly double its capacity to 800,000 barrels per day.
But Enbridge needed the permit for the 3-mile segment that crosses the U.S.-Canadian border near Neche, North Dakota. After nearly five years of review, the State Department said Monday that issuing the permit serves the national interest.
Enbridge has been running Line 67 at full capacity by using a short detour into a parallel pipeline for crossing the border.
Line 67 carries Alberta crude across Minnesota to Superior, Wisconsin.