The Treasury Department released its guidance on an updated Greenhouse Gases, Regulated Emissions and Energy Use in Transportation (GREET) model for sustainable aviation fuel (SAF) today. SAF would be eligible for a tax credit known as 40B for the section of the Inflation Reduction Act that created the credit. As WPI reported on 9 April, this updated model was expected on 1 March, and prior to that in December 2023. The model was updated by the Department of Energy’s Argonne National Laboratory, but the roll out comes in the form of Treasury Department guidance as it is the basis for a tax credit. The holdup is the IRS/Treasury Department who is focused on making sure that the rules for the credits don’t result in tax fraud. Th...