Northern Tier Energy is an independent downstream energy company with refining, retail, and pipeline operations that serve the PADD II region of the United States.Refining BusinessNorthern Tier Energy's refining business primarily consists of an 89,500 barrels per calendar day (96,500 barrels per stream day) refinery located in St. Paul Park, Minnesota. The St. Paul Park Refinery is one of only two refineries in Minnesota and one of four refineries in the Upper Great Plains area within the PADD II region. . The refinery produces a broad slate of refined products including gasoline, diesel, jet fuel and asphalt, which are then marketed to resellers and consumers primarily in the PADD II region.Northern Tier Energy also owns various storage and transportation assets, including a light products terminal, a heavy products terminal, storage tanks, rail loading/unloading facilities and a Mississippi river dock. The refining business also includes a 17% interest in the Minnesota Pipe Line Company, which owns and operates the Minnesota Pipeline, a 455,000 bpd crude oil pipeline system that transports crude oil (primarily from Western Canada and North Dakota) for approximately 300 miles from the Enbridge pipeline hub at Clearbrook, Minnesota to the refinery. Retail BusinessAs of June 30, 2013, the retail business operated 164 convenience stores under the SuperAmerica brand and also supported 75 franchised convenience stores, which are also operated under the SuperAmerica brand. The refinery supplies substantially all of the gasoline and diesel sold in the company-operated and franchised convenience stores.Northern Tier Energy also owns and operates SuperMom's Bakery, which prepares and distributes baked goods and other prepared food items for sale in the company-operated and franchised convenience stores and other third party locations.