Valero Energy Corporation is an American-based downstream petroleum company mostly involved in manufacturing and marketing transportation fuels, other petrochemical products, and power. It is headquartered in San Antonio, Texas, United States. Throughout the United States and Canada, the company owns and operates 15 refineries, and one in Wales, with a combined throughput capacity of approximately 3 million barrels per day, 11 ethanol plants with a combined production capacity of 1.2 billion US gallons per year, and a 50-megawatt wind farm. A Fortune 500 company, before the 2013 spinoff of CST Brands, Valero was one of the United States' largest retail operators with approximately 6,800 retail and branded wholesale outlets in the United States, Canada, United Kingdom, Mexico and Peru under the Valero, Diamond Shamrock, Shamrock, Beacon, and Texaco brands. It is largest independent petroleum refiner and marketer in North America. Wikipedia