US DOE update to 45ZCF-GREET model strengthens path for American biofuels

The U.S. DOE released an updated 45ZCF-GREET model used to determine the carbon intensity of fuels qualifying for the 45Z clean fuel production credit. 

This change has been anticipated since the passage of the 2025 One Big Beautiful Bill Act.  

The change, however, marks the first time renewable fuel producers can input data into the model and receive results that reflect the changes Congress made.  

Most importantly, this includes the removal of flawed and unscientific indirect land-use change (ILUC) penalties. 

“This update better reflects the role of U.S. biofuels in reducing emissions and supporting rural economies,” said Monte Shaw, executive director of the Iowa Renewable Fuels Association. “It moves away from flawed, unscientific assumptions about biofuels and better recognizes their true carbon benefits. IRFA appreciates the DOE’s work on the much-needed certainty the new model provides our biofuels producers as they work to qualify for 45Z credits and to produce the ultra-low carbon biofuels increasingly demanded around the globe.”