Green Plains is involved in manufacturing and selling ethanol and ethanol byproducts. The company organizes itself into four segments based on function. The ethanol production segment, which generates the majority of revenue, includes the production of ethanol, distillers grains, and corn oil. The agribusiness and energy services segment includes the grain procurement and commodity marketing business, which markets, sells, and distributes ethanol, distillers grains, and corn oil. The food and ingredients segment include cattle feeding operations. The partnership segment is involved in providing fuel storage and transportation services.