Valero Energy is an independent petroleum refining and marketing company that focuses on manufacturing and marketing transportation fuels and petrochemical products. It operates through two segments: Refining and Ethanol. The company owns and operates 16 refineries throughout the United States, Canada, United Kingdom, and the Caribbean with a combined throughput capacity of approximately 3 million barrels (480,000 m3) per day. It employs over 10,000 workers and is based in San Antonio, Texas.