Bill Gates-founded Breakthrough Energy Ventures recently unveiled a $150 million sustainable aviation fuel (SAF) fund aimed at accelerating the adoption of low-carbon jet fuels. The initiative, which includes strategic investments from Alaska Airlines and American Airlines, seeks to address one of SAF’s biggest hurdles: cost competitiveness.
While U.S. producers benefit from production-side incentives like the 45Z, LCFS and the Renewable Fuel Standard, the absence of enforceable national blend mandates or buyer-side subsidies continues to limit market uptake. As a result, SAF currently accounts for less than 1% of U.S. jet fuel consumption. Breakthrough’s SAF fund demonstrates some airlines’ willingness to support alternative fuels, creating demand signals that could broaden industry participation.
The fund is technology-agnostic but prioritizes technologies that can compete on cost with conventional jet fuel. It excludes fuels from hydroprocessed esters and fatty acids, which account for over 95% of the current U.S. SAF supply, due to concerns over feedstock limitations and scalability.
While certain synthetic SAF pathways offer higher potential revenue per gallon when supplemented by credits, they remain hampered by capital intensity and commercial immaturity. Still, new synthetic and alcohol-to-jet SAF projects are slated to come online later this decade, potentially expanding the market for emerging technologies supported by this fund (Figure 1).
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DID YOU KNOW?
Sustainable aviation fuel is “drop-in” ready, meaning it can be used in today’s aircraft without modifications. SAF can reduce greenhouse gas emissions by as much as 80%, depending on the feedstock and production method.
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