CleanTech Alpha Corporation, formerly GreenShift Corporation, develops and commercializes clean technologies that facilitate the use of natural resources for the ethanol industry in the United States. The company offers corn oil extraction technology that integrates into the back-end of existing dry mill corn ethanol plants to extract and recover inedible crude corn oil for production of advanced carbon-neutral liquid fuels and biomass-derived alternatives to fossil fuel-based products; it licenses these technologies to ethanol producers and provides value-added services based on its expertise and intellectual property. Founded in 1984 and headquartered in Oklahoma City, Oklahoma, the company operates primarily in the United States with a focus on renewable energy and waste management segments targeting ethanol producers. In August 2021, the company changed its name from GreenShift Corporation to CleanTech Alpha Corporation; it continues to emphasize biodiesel production capabilities alongside corn oil extraction while maintaining ongoing research and development for additional patented clean technologies.