Heron Lake BioEnergy, LLC produces and sells ethanol and co-products, and non-edible corn oil in the United States. It operates in two segments, Ethanol Production and Natural Gas Pipeline. The company offers fuel-grade ethanol, which is used as an octane enhancer in fuels; as an oxygenated fuel additive that could reduce ozone and carbon monoxide vehicle emissions; as a non-petroleum-based gasoline substitute; and as a renewable fuel to displace consumption of imported oil. It also provides distillers' grains, an animal feed ingredient primarily marketed to the dairy and beef industries; crude corn oil, which is used principally as a biodiesel feedstock and as a supplement for animal feed; and corn syrup primarily used as a feed additive to moisten dry feed stuffs, such as hay. In addition, the company operates a natural gas pipeline that provides natural gas to its ethanol production facility and other customers. It distributes and markets its products through third party marketers. The company was formerly known as Generation II, LLC and changed its name to Heron Lake BioEnergy, LLC in June 2004. The company was founded in 2001 and is headquartered in Heron Lake, Minnesota. As of January 29, 2020, Heron Lake BioEnergy, LLC operates as a subsidiary of Granite Falls Energy, LLC.