Updates to 45ZCF-GREET model incorporate new methods of alternative fuel production, allowing more American farmers to benefit from rising bioenergy demand
Office of Energy Efficiency & Renewable Energy
May 30, 2025
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WASHINGTON—The U.S. Department of Energy (DOE) Bioenergy Technologies Office today removed barriers to domestic bioenergy production by updating its 45ZCF-GREET modeling tool to account for new feedstocks and methods of production, including ethanol from corn wet-milling and natural gas from coal-mine methane. These measures will allow a wider range of farmers and companies to do business in America’s thriving alternative fuels market.
“This is a major win for the U.S. farmer and rural America,” said Senator Roger Marshall (R-KS). “Once again, President Trump and his administration are growing markets and opportunity for farmers and rural America to flourish.”
“The Trump administration is committed to helping American fuel producers make the most of our country’s abundant biomass resources,” said Principal Deputy Assistant Secretary for Energy Efficiency and Renewable Energy Lou Hrkman. “The latest version of the 45ZCF-GREET model will allow more of our farmers to reap the benefits of a rapidly expanding market for alternative transportation fuels.”
The 45ZCF-GREET model has been adopted by the U.S. Department of the Treasury to help transportation fuel producers assess their eligibility for 45Z. To download the latest GREET model, updated user manual, and a log of all changes, visit www.energy.gov/eere/greet. For questions on how to use the model, please contact 45ZCFGREETSupport@ee.doe.gov.
First developed by Argonne National Laboratory in 1994, the GREET® (Greenhouse gases, Regulated Emissions, and Energy use in Technologies) suite of models assess the life cycle impacts of technologies, fuels, products, and energy systems across various stages of the supply chain. Today, there are multiple GREET models for specific use cases that guide decision-making, research and development, and regulations related to the transportation and energy sectors. The models are freely available for industry to use and play an integral role in DOE’s research, development, and deployment efforts.