New True-Up and Deficit Mechanisms Under California’s Low Carbon Fuel Standard Are Reshaping Credit Risk, Rewarding Conservatism, and Penalizing Operational Drift
By Brad Pleima, president and Alicia Jones, compliance consulting services director EcoEngineers, an LRQA Company
California’s Low Carbon Fuel Standard (CA-LCFS) has moved into a more disciplined phase. Following amendments adopted in 2025, the program now features a steeper carbon intensity (CI) reduction trajectory, the transition to California Greenhouse Gases, Regulated Emissions, and Energy Use in Transportation (CA-GREET) 4.0 modelling, and, most significantly, a formalized true-up and deficit obligation structure with a 4x penalty for CI exceedances.
For market participants, this is not a cosmetic update. It is a structural recalibration of risk. Whereas previously credit exposure was largely tied to production volumes and benchmark trajectories, the revised framework now links financial outcomes directly to verified operational performance. CI management is no longer an annual reporting exercise, it is a balance sheet variable.
Rebalancing the Credit Market
The regulatory shift comes after several years in which credit generation consistently outpaced deficit creation. As fuel supply diversified and low-CI pathways expanded, the credit bank accumulated at pace, exerting sustained downward pressure on prices.
The California Air Resources Board’s (CARB’s) response was deliberate. The amended rule tightens the CI benchmark curve, expands the program to 2045 and introduces an automatic acceleration mechanism designed to respond to the credit oversupply and bank built over the last several years. Recent quarters have already shown deficits beginning to narrow the surplus gap and Q3 2025 was the first quarter since 2022 where deficits outpaced credit generation.
But the bigger change lies not in the trajectory, but in the management of a facility’s always moving carbon intensity score.
The 1x Benefit vs. the 4x Penalty
Beginning with the 2025 Annual Fuel Pathway Report (AFPR), verified operational CI scores are compared to previously certified pathway CI values.
Two outcomes are now possible:
- If operational CI improves compared to certified pathway CI:
Additional credits are issued at 1x. Producers effectively “true up” the delta between reported and verified performance. This true up would not occur until after the AFPR is verified by a third-party verifier.
- If operational CI worsens compared to certified pathway CI:
Over-generated credits are invalidated (1x), and a 4x deficit obligation applies to the variance.
In practical terms, that means a fivefold exposure relative to the original overgeneration. At current market values, even modest CI drift can translate into six-figure impacts. Importantly, the penalty is not a cash fine paid to CARB. Credits must be retired from circulation, and the pathway holder bears the market cost of acquiring and surrendering those credits if insufficient balances are held.
The direction from CARB is clear: do not operate at a CI score worse than the existing certified pathway CI. The program now expects active CI understanding and management and incentivizes producers to take a conservative approach with credit generation.
CA-GREET 4.0: Subtle Model Changes, Real Implications
The shift from CA-GREET 3.0 to 4.0 introduces updated electricity emission factors, minor changes to fossil fuel intensities, expanded applicability of Tier 1 pathways, and technical revisions for dairy, swine, and landfill gas projects.
Model-driven CI adjustments tied solely to the transition are exempt from claw-back provisions. However, operational variability remains fully exposed. For renewable natural gas (RNG) facilities, ethanol plants, and renewable diesel producers alike, the primary risk vector is day-to-day plant performance and using ongoing operational data to determine actual CI.
Operational Drift as Financial Risk
CI variance can arise from routine operational realities:
- Increased grid electricity use during downtime or restarts
- Changes in feedstock transport distances
- Manure collection variability
- Landfill oxygen intrusion
- Extreme weather impacts on instrumentation
- Maintenance-related flaring events
Under the revised framework, such deviations are no longer absorbed quietly into future modelling. They are monetized. A facility operating slightly above its certified CI for multiple quarters may face a compounded deficit obligation, particularly if credit prices rise between generation and compliance settlement.
The structure incentivizes active monitoring rather than retrospective reconciliation.
The Margin of Safety: Strategic Buffering
CARB provides one risk management lever: the Margin of Safety (MOS).
Prior to AFPR verification, pathway holders may elect to apply a CI buffer above their verified operational value. If subsequent CI exceedance falls within that buffer, the 4x deficit penalty is avoided. The trade-off is delayed credit realization. Overly conservative MOS selection reduces near-term revenue but mitigates downside exposure.
In volatile operational environments, particularly for facilities with high start-stop frequency or variable feedstock characteristics, MOS may function as an insurance mechanism against unforeseen exceedance. But being too conservative will have credit and cash flow impacts as the true up period will not occur until the following year after annual AFPR verification. For example, an under-generation of credits from a conservative MOS in Q2 2026 would not see true up credits until Q3 or Q4 2027.
Credit Inventory as Risk Hedge
Another emerging strategy involves retaining a portion of generated credits in the LCFS Reporting Tool (LRT) account rather than fully monetizing forward.
Because deficit obligations must be satisfied by the following April compliance deadline, when regulated entities submit their annual CA-LCFS compliance reports and must hold sufficient credits in the system to cover any deficits, holding credits provides optionality. If prices appreciate and an exceedance occurs, repurchase costs can materially amplify losses. Credit banking, once viewed primarily as speculative positioning, is increasingly framed as compliance insurance.
This should not be considered a risk mitigation strategy to avoid the deficit obligation 4x penalty but rather a price risk mitigation strategy should a facility fall into the deficit obligation requirement.
From Compliance to Performance Management
The revised CA-LCFS framework effectively converts CI into a continuously managed operational key performance indicator (KPI).
Best practice now includes:
- Quarterly or monthly CI tracking
- Forward modelling of operational scenarios
- Early-year corrective action if CI drift appears
- Strategic MOS calibration
- Credit inventory management aligned to exposure
For producers, this likely will require enhanced internal carbon accounting systems and closer coordination between operations, commercial, and compliance teams.
A More Disciplined Market
The introduction of true-ups and deficit obligations strengthens program integrity. Overgeneration risk is curtailed, credits are retired in cases of exceedance, and performance accountability is sharpened. In doing so, CARB is signaling that the next phase of the CA-LCFS will reward operational precision.
For participants, the implication is straightforward: carbon intensity is no longer a static modelling output. It is a managed financial parameter. Those who treat it accordingly will navigate the tightened regime with limited disruption. Those who do not may find the 4x penalty mechanism an expensive lesson in operational governance.
About the Authors
Brad Pleima is president of EcoEngineers. With over 20 years of experience in the renewable energy and engineering sectors, he has provided advisory services to more than 300 renewable energy production facilities and supported the construction of over $4 billion in anaerobic digester and renewable natural gas projects nationwide.
Alicia Jones is the compliance consulting director at EcoEngineers. She works with companies navigating low-carbon fuel programs and evolving carbon market regulations, supporting lifecycle analysis, pathway management, and regulatory compliance strategies across renewable fuels and decarbonization initiatives.
About EcoEngineers
EcoEngineers, an LRQA company, is a consulting, auditing, and advisory firm exclusively focused on the energy transition and decarbonization. From innovation to impact, EcoEngineers helps its clients navigate the disruption caused by carbon emissions and climate change. Its team of engineers, scientists, auditors, consultants, and researchers live and work at the intersection of low-carbon fuel policy, innovative technologies, and the carbon marketplace. For more information, visit www.ecoengineers.us.
