DAC Carbon as an RFNBO Input: The Regulatory Logic

Under RED III, renewable fuels of non-biological origin (RFNBOs) — including Power-to-Liquid e-fuels — must meet a lifecycle greenhouse-gas saving threshold of at least 70% versus the fossil comparator. The CO₂ feedstock source is not a footnote: it is a certification variable. Atmospheric CO₂ captured by DAC satisfies the ‘recycled carbon’ and ‘additional carbon’ criteria in a way that point-source industrial CO₂ does not always achieve on a lifecycle basis. As DAC unit costs fall — Mammoth’s sixfold output expansion signals a learning-curve effect — the cost premium embedded in DAC-derived e-fuels compresses, improving their competitiveness on a certified-pathway basis.

This is material for ReFuelEU Aviation, which mandates a 0.7% synthetic fuel share by 2030, rising steeply thereafter. Fuel suppliers and airlines building supply agreements today — like the American Airlines–Google SAF-certificate deal covering 35 million gallons over three years — need certified CO₂ pathways locked in years ahead of delivery. DAC is increasingly the pathway that closes that certification gap without reliance on geographically constrained industrial emitters.

Compliance Gap: 13 Member States and the Penalty Regime Problem

The regulatory context is not uniformly favourable. The European Commission launched infringement proceedings in June 2026 against 13 Member States for failing to communicate penalty regimes under ReFuelEU Aviation by the December 2024 deadline. Without enforceable national penalties, the demand signal that drives investment in certified CCU infrastructure — including DAC offtake agreements — is weakened. Compliance directors sourcing RFNBO-certified e-fuels should note that the absence of penalty regimes in a significant share of EU aviation markets creates pricing uncertainty for supply contracts structured around mandate-driven demand.

For operators in those 13 jurisdictions, the infringement proceedings introduce a secondary compliance risk: retroactive penalty frameworks, once implemented under Commission pressure, may apply to blend shortfalls that have already accrued. Fuel procurement strategies that assumed regulatory leniency should be reassessed.

Scaling DAC to Mandate-Relevant Volumes: The Gap That Remains

675 tonnes of CO₂ captured in six months is a genuine operational milestone, but it must be contextualised against mandate scale. EU aviation alone consumes roughly 40 million tonnes of jet fuel per year; the 0.7% synthetic sub-mandate by 2030 implies approximately 280,000 tonnes of PtL-SAF, requiring several million tonnes of certified CO₂ annually. Mammoth’s current run-rate, extrapolated, covers a fraction of a percent of that requirement. The technology is proven; the industrial scaling is not yet complete. Critics from Transport & Environment and the ICCT are right that e-fuels carry a significant energy-efficiency cost versus direct electrification — roughly five times more renewable electricity per kilometre in road applications — but in aviation, where batteries cannot serve long-haul routes, DAC-fed PtL is one of very few pathways to deep decarbonisation. That asymmetry is precisely why the ReFuelEU synthetic sub-mandate exists, and why Mammoth’s output trajectory, however small today, registers as a policy-relevant signal.

Sources

• ReFuelEU Aviation — European Commission
• ReFuelEU Aviation blend trajectory & scope — e-fuels.com

Featured image via Unsplash.