Heathrow Airport is committing more than £80 million to bridge the cost gap between SAF and conventional kerosene for airlines in 2026, targeting a fuel uplift of 5.6% — 2 percentage points above the UK government’s 3.6% SAF mandate. At 5.6%, the scheme would deliver approximately 350,000 tonnes of SAF and reduce carbon emissions by around 600,000 tonnes — the equivalent of eliminating more than 950,000 economy-class return flights between London Heathrow and New York JFK.
The incentive scheme operates through Heathrow’s charges infrastructure: the airport collects a pot via the departing passenger charge and redistributes it to participating airlines as credits, effectively halving the premium airlines pay over conventional jet fuel. The SAF price premium — typically three to five times the cost of fossil kerosene — is the primary structural barrier to voluntary airline purchasing. Heathrow’s model converts that barrier into a shared cost, using airport-level revenue recycling to pull demand forward rather than waiting for production economics to close the gap on their own.
The scale of Heathrow’s existing SAF consumption gives the scheme credibility beyond its design. The airport handled 17% of global SAF supply in 2024 — a figure that reflects how a single hub with consistent demand signals and financial incentives in place can concentrate the market. Its 2030 ambition — 11% SAF as a share of total fuel uplift, against the UK mandate’s 10% floor — extends that pattern of setting targets above the regulatory minimum.
‘Sustainable Aviation Fuel is not a hypothetical concept for the future, it is already producing real impact in 2026. Heathrow is leading the way globally, with 17% of the world’s SAF supply in 2024 used at the airport.’ — Matt Gorman, Director of Sustainability, Heathrow
Now in its fifth year, the Heathrow incentive programme is one of the longest-running airport-level SAF demand mechanisms in the world. The consistency matters as much as the individual annual commitment — multi-year visibility gives SAF producers a demand anchor to plan production against, and gives airlines a predictable cost-offset to factor into procurement decisions. A separate incentive pot is available for cargo operators alongside the passenger scheme.
Whether this model spreads to other major hubs will shape how quickly SAF demand aggregates at the scale required to justify the next generation of production investment. Heathrow’s programme demonstrates the mechanism works. The question is which airports build equivalent infrastructure before their regulatory obligations require it.
Source: Heathrow
