Valero Energy is a manufacturer and marketer of transportation fuels and petrochemical products. It operates through three segments: Refining, Renewable Diesel, and Ethanol. The Refining segment includes the operations of petroleum refineries and refined petroleum product marketing as well as the logistics assets that support those operations; the Renewable Diesel segment is responsible for the operations of dangerous goods declaration (DGD) and renewable diesel marketing; the Ethanol segment handles the operations of ethanol plants as well as marketing of ethanol and co-products.