On March 27, 2026, CARB issued LCFS Guidance 26-01 explaining the Automatic Acceleration Mechanism (AAM), the provision added in the 2025 amendments that can pull the program’s carbon intensity benchmarks forward by one year when the credit market runs persistently long. CARB will use full-year 2026 credit bank data to make its first possible trigger announcement on May 15, 2027. The AAM is no longer a theoretical future risk: it belongs in every LCFS participant’s planning framework for 2026 and 2027.
How the AAM Works
The AAM is CARB’s answer to the persistent credit oversupply that has weighed on LCFS prices, the mechanics are laid out in LCFS Guidance 26-01. Under §95484(c)(1) of the amended regulation, benchmark acceleration is evaluated against the regulation’s trigger conditions, which are based on the size of the credit bank relative to deficit generation. If CARB announces a trigger, the CI benchmark schedule advances by one year, taking effect January 1 of the calendar year following the announcement. So, a May 15, 2027, trigger would move benchmarks beginning January 1, 2028, roughly seven to eight months after the announcement. The AAM cannot be triggered in the calendar year immediately following a trigger announcement; after that one-year pause, it can trigger again if the conditions are met.
The Timeline to Watch
- 2026: CARB accumulates full-year 2026 credit bank data through quarterly reporting.
- May 15, 2027: First possible AAM trigger announcement.
- January 1, 2028: If triggered, CI benchmarks advance by one year beginning January 1, 2028.
What This Means for LCFS Participants
- Credit generators: An acceleration increases deficit generation for fossil fuel suppliers and strengthens credit demand. This is broadly positive for RNG, renewable diesel, biodiesel, and ethanol credit generators. However, lower CI benchmark also means less credit generation for producers of renewable fuels.
- Deficit generators: Compliance cost projections built on the current benchmark schedule understate exposure under an AAM scenario – run both cases.
- Project developers: Pathway application timing and investment decisions made in 2026 should be stress-tested against a 2028 LCFS benchmark acceleration.
Action Checklist
- Track quarterly LCFS credit bank data through 2026 – it is the input to the May 2027 decision.
- Model your credit position and compliance costs under both the current schedule and a 2028-accelerated schedule.
- Revisit long-term offtake and pathway-application timing against the AAM scenario.
Trinity’s Clean Fuels Practice provides a full menu of LCFS services, including LCA modeling, credit market forecasts, transactions reporting, and verification support. If you would like to discuss the AAM and how it may impact your operations, please email Alex Marcucci.
