Marathon Petroleum is an independent refiner with 13 refineries in the midcontinent, West Coast, and Gulf Coast of the United States with total throughput capacity of 3.0 million barrels per day. Its Dickinson, North Dakota, facility produces 184 million gallons a year of renewable diesel. Its Martinez, California, facility will have the ability to produce 730 million gallons a year of renewable diesel once converted. The firm also owns and operates midstream assets primarily through its listed master limited partnership, MPLX.