Green Plains Inc manufactures and sells ethanol and ethanol byproducts in two segments based on function. The ethanol production segment, which generates the majority of revenue, includes the production of ethanol, distillers grains, Ultra-High Protein and renewable corn oil. The agribusiness and energy services segment includes grain handling and storage, commodity marketing and merchant trading for company-produced and third-party ethanol, distillers grains, Ultra-High Protein, renewable corn oil, natural gas and other commodities.