ReFuelEU Aviation, line by line.
The regulation that forces every EU fuel supplier and every qualifying EU airport into a 25-year SAF ramp · binding blend targets, a synthetic-fuel sub-mandate, and penalties calibrated to remove the commercial incentive to miss them.
ReFuelEU Aviation
Effective 2025-01-01
EU regulation mandating minimum SAF blending at EU airports. Progressive targets from 2% in 2025 to 70% in 2050, with sub-quota for synthetic fuels starting at 1.2% in 2030.
How the mandate works
ReFuelEU Aviation is not a directive that requires national transposition · it is a directly applicable EU regulation, binding on fuel suppliers and aircraft operators from the day it entered into force. Fuel placed on the Union market for aviation use must meet a rising minimum share of sustainable aviation fuel · measured by energy content, aggregated per supplier per year, with a ± 2 percentage-point carry-over balance across reporting cycles.
The headline number most people quote · "70% by 2050" · is only one point on the curve. The ramp is stepped in five-year increments, and from 2030 a sub-mandate for synthetic aviation fuel (e-SAF / RFNBO) runs in parallel. Unlike the total-SAF target, the e-SAF sub-mandate must be met exactly each year · no carry-over balance.
The blend trajectory
| Year | Target |
|---|---|
| 2025 | 2% SAF |
| 2030 | 6% SAF (1.2% synthetic) |
| 2032 | 6% SAF (2% synthetic) |
| 2035 | 20% SAF (5% synthetic) |
| 2040 | 34% SAF (10% synthetic) |
| 2045 | 42% SAF (15% synthetic) |
| 2050 | 70% SAF (35% synthetic) |
The e-SAF sub-quota is the detail that changes the investment calculus. Bio-based SAF alone cannot meet the 2050 target · there is not enough feedstock globally to sustain 70% by volume at European scale. The regulation makes Power-to-Liquid economically mandatory in the long run by guaranteeing a sub-market that only RFNBO-compliant fuel can serve.
What counts as SAF under ReFuelEU
Eligible fuels fall into three buckets, each certified under the Renewable Energy Directive III chain-of-custody framework:
- Advanced biofuels from RED III Annex IX Part A feedstocks · agricultural and forestry residues, non-recyclable waste streams, algae. Minimum 65% GHG savings versus the 94 gCO₂e/MJ fossil comparator.
- Biofuels from Annex IX Part B feedstocks · used cooking oil, animal fats categories 1 & 2. Same 65% threshold, quantitatively capped.
- RFNBOs (synthetic / e-SAF) from renewable electricity, green hydrogen, and captured CO₂. Minimum 70% GHG savings. Temporal and geographic correlation rules per Delegated Regulation (EU) 2023/1184.
Explicitly excluded: food- and feed-crop-based biofuels, SAF produced outside the EU without RED III certification, and fuels claiming CORSIA-only compliance without meeting RED III sustainability criteria.
Scope · who is on the hook
Alongside the fuel suppliers, aircraft operators carry a parallel obligation: they must uplift at least 90% of their yearly aviation-fuel need at each qualifying EU airport itself · the "anti-tankering" rule · so that operators cannot legally sidestep the blend mandate by fueling outside the Union and carrying extra weight into the EU.
The penalty formula, worked
Article 12 sets the administrative fine at at least twice the price difference between the SAF the supplier should have delivered and the fossil kerosene it did deliver instead · in the same year, on the same volume.
Fine ≥ 2 × (SAF_market_price − Jet_A1_price) × deficit_in_tonnes
At a 2026 SAF-to-fossil price gap of roughly $2,500 per tonne, a 1,000-tonne shortfall triggers a €4.6-5.0 million penalty. Aircraft-operator fines for violating the 90% anti-tankering rule are structured the same way · 2× the cost of the fuel avoidance. The calculation is deliberately punitive: the regulation is designed to make non-compliance strictly more expensive than procuring the SAF.
How it compares to CORSIA, UK, and US 45Z
| ReFuelEU | CORSIA (ICAO) | UK SAF Mandate | US 45Z | |
|---|---|---|---|---|
| Mechanism | Binding blend mandate | Offset-or-reduce | Blend mandate + revenue certainty | Production tax credit |
| Demand signal | Physical fuel volume | Emission-unit purchase | Physical fuel volume + price backstop | Production incentive · no demand obligation |
| E-SAF carve-out | Yes · 1.2% → 35% | No | No (implicit via higher buy-out) | No |
| Horizon | To 2050 | To 2035 in current rulebook | To 2040 | Through 2029 (OBBB-dependent) |
ReFuelEU is the most aggressive of the four in terms of long-dated certainty · and the only one with an explicit synthetic-fuel carve-out that locks in demand for the PtL pathway independent of feedstock-based SAF economics.
Primary source
European Commission · external reference →
Secondary references: EASA European Aviation Environmental Report (annual) · Delegated Regulation (EU) 2023/1184 (RFNBO correlation rules) · RED III targets and rules.