US Treasury updates SAF tax credit guidelines
The US Treasury Department released long-awaited guidance on tax credit eligibility for ethanol-derived sustainable aviation fuel (SAF) Tuesday, incorporating so-called climate-smart agricultural (CSA) practices.
As part of the new guidance, the agencies comprising the SAF Interagency Working Group (IWG) are jointly releasing the 40B SAF-GREET 2024 model, which provides another methodology for SAF producers to determine lifecycle greenhouse gas (GHG) emissions rates of their production for the credit. It also incorporates a pilot program to encourage the usage of CSA practices for SAF feedstocks.
In collaboration with the US Department of Agriculture (USDA), the major changes include further guidance on farming practices, including no-till farming, planting cover crops and enhanced efficiency fertilizer.
The $1.25/USG 40B SAF credit applies to a qualified fuel mixture containing SAF for certain sales or uses after 31 December 2022, and before 1 January 2025. To qualify for the credit, the SAF must have a minimum lifecycle greenhouse gas emissions reduction of 50pc compared with petroleum-based jet fuel. Additionally, there is a supplemental credit of one cent for each percent that the reduction exceeds 50pc, for a maximum credit of $1.75/USG.
The modified version of the Greenhouse gases, Regulated Emissions, and Energy use in Technologies (GREET) also incorporates new data, including updated modeling of key feedstocks and processes used in aviation fuel and indirect emissions. The modified GREET model also integrates key GHG emission reduction strategies, such as carbon capture and storage, renewable natural gas, and renewable electricity.
The notice provides a safe harbor for use of the USDA Climate Smart Agriculture Pilot Program to further cut the emissions reduction percentage calculated for domestic soybean and domestic corn feedstocks and for certifying the related requirements.
For corn ethanol-to-jet, the pilot provides a greenhouse gas reduction credit if a "bundle" of certain CSA practices — no-till farming, cover crop planting, and enhanced efficiency fertilizer — are used. It would also allow a greenhouse gas reduction credit for soybean-to-jet production if the soybean feedstock is produced using similar CSA practices. This is a pilot program specific to the 40B credit under the Inflation Reduction Act (IRA), which is in effect for 2023 and 2024.
A new 45Z-GREET will be developed for use with the 45Z tax credit, which starts on 1 Jan 2025. Given the similar language between section 40B and section 45Z of the IRA regarding methods for determining lifecycle greenhouse gas emissions reduction percentages, it is expected that the positions taken by Treasury and the IRS related to the section 40B credit will be similar for the new clean fuel producer credit under section 45Z.
Industry reaction mixed
Renewable fuels groups welcome the updated pathway for ethanol-to-jet, but the groups expressed concern over the scope of the guidance.
"We are encouraged that, for the first time ever, this carbon scoring framework will recognize and credit certain climate-smart agricultural practices," Renewable Fuels Association president and chief executive Geoff Cooper said. "However, RFA believes less prescription on ag practices, more flexibility, and additional low-carbon technologies and practices should be added to the modeling framework to better reflect the innovation occurring throughout the supply chain."
Kailee Buller, chief executive of the National Oilseed Processors Association, also said the new guidance has shortcomings.
"We are concerned the requirement to implement climate-smart ag practices simultaneously will limit this opportunity, particularly in parts of the country where it may not be possible to plant a cover crop or the cost to implement new practices is too steep," Buller said.
Both groups said they would continue to work with the Biden administration to further opportunities for SAF development.
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