Notice 2024-6 sustainable aviation fuel (SAF) guidance. The Treasury Department and the IRS developed Notice 2024-6 in consultation with the Environmental Protection Agency (EPA) and other agencies, to provide safe harbors for using the EPA’s Renewable Fuel Standard (RFS) program to calculate both the emissions reduction percentage and RFS guidance to certify related sustainability requirements under section 40B. The notice also explains that the existing Greenhouse gases, Regulated Emissions, and Energy use in Transportation (GREET) model of the Argonne National Laboratory (ANL-GREET model) is a methodology that doesn’t satisfy the requirements to calculate the emissions reduction percentage under section 40B(e)(2). To date, no GREET-based model has been identified as satisfying the applicable requirements. The Department of Energy is collaborating with other federal agencies to develop the GREET model to calculate the emissions reduction percentage and anticipate that it will be available in early 2024. An SAF model certificate has been created to support an SAF claim and it’s at the end of the notice. See Notice 2024-6 for details.
