Valero Energy Corporation is an American-based fuels producer mostly involved in manufacturing and marketing transportation fuels and other related products. It is headquartered in San Antonio, Texas, United States.[2] Throughout the United States, Canada, and the U.K., the company owns and operates 15 refineries with a combined throughput capacity of approximately 3.2 million barrels per day, two renewable diesel plants that produce approximately 1.2 billion gallons per year, and 12 ethanol plants with a combined production capacity of 1.6 billion gallons.[3][4][5] According to a number of estimates, Valero has become a major producer of corn ethanol and renewable diesel, both low-carbon liquid transportation fuels.[6][7]