Valero Energy Corporation is a Fortune 500 international manufacturer and marketer of transportation fuels, other petrochemical products, and power. It is headquartered in San Antonio, Texas, United States. Valero Energy is the best-in-class producer of essential fuels and products that are foundational to modern life. Not just today, but for generations to come. The company is the largest independent petroleum refiner in the world and America's largest renewable fuels producer.