Author: Derek Michalski, Editor.
A shift in framing but not yet in physics
Electro-sustainable aviation fuel (eSAF) is increasingly presented in Europe as more than a decarbonisation pathway for aviation. With the launch of the European eSAF Coalition, formed by Arcadia eFuels, INERATEC, Norsk e-Fuel, SkyNRG, and ZAFFRA, the narrative has expanded into something broader: energy security, industrial competitiveness, and defence readiness.
The Coalition argues in its public positioning that eSAF should be treated as strategic infrastructure, linking synthetic fuels to Europe’s energy sovereignty and industrial resilience. In its communications, it emphasises that domestic production of synthetic fuels is becoming essential for reducing dependence on imported fossil jet fuel and strengthening energy security.
This reflects a broader policy direction already visible in EU industrial strategy documents and aviation regulation, particularly the ReFuelEU Aviation framework.
However, this framing does not change the underlying physical reality of the system. eSAF remains fundamentally a hydrogen-based synthetic fuel pathway, and its scalability is still constrained by upstream energy and infrastructure bottlenecks.
eSAF is structurally a hydrogen system
At its core, eSAF is produced through a Power-to-Liquid (PtL) process:
renewable electricity → electrolysis → green hydrogen → CO₂ conversion → synthetic kerosene
Hydrogen is not a secondary input. It is the central energy carrier that enables the conversion of electricity and carbon dioxide into liquid hydrocarbons suitable for aviation.
In practical terms, hydrogen performs three roles: it stores renewable electricity in chemical form, supplies the hydrogen atoms required for hydrocarbon synthesis, and enables the chemical reduction of carbon dioxide into fuel molecules.
This is why engineers and developers across the sector increasingly describe PtL facilities as hydrogen-enabled industrial systems rather than conventional fuel plants.
The real constraint is not fuel synthesis
The Fischer–Tropsch and related synthesis pathways used to produce synthetic kerosene are mature and well understood at industrial scale. The limiting factors sit upstream.
The dominant constraint is the availability of low-cost, large-scale green hydrogen.
This point is consistently reflected across the hydrogen industry and policy community. The European Commission’s hydrogen strategy (COM/2020/301) explicitly identifies renewable electricity availability and electrolysis scale-up as the central bottlenecks to hydrogen deployment.
Similarly, industry leadership at Jorgo Chatzimarkakis has repeatedly emphasised that the challenge is not hydrogen as a molecule, but the creation of investable, bankable demand structures that can support large-scale infrastructure deployment.
In parallel, executives such as Jon André Løkke have consistently highlighted that electrolyser technology is commercially available today, but deployment is constrained by electricity pricing, offtake certainty, and infrastructure readiness.
The combined implication is clear: hydrogen is no longer a scientific barrier, but an industrial financing and system-integration challenge.
A sector dominated by announcements, not assets
Europe currently accounts for a significant share of announced global eSAF capacity. However, the majority of this pipeline remains at early development stages, with many projects still pre-final investment decision.
This gap between announcements and execution is not unique to eSAF. It reflects the broader state of the hydrogen economy, where project pipelines are expanding faster than enabling infrastructure is being built.
The European eSAF Coalition reflects both ambition and constraint. It brings together developers with multi-gigawatt project pipelines across France, Germany, the Nordics, Spain, and other aviation hubs, but also a sector still dependent on external hydrogen supply conditions to reach commercial maturity.
Its policy priorities—establishing strategic infrastructure status, closing the cost gap with fossil jet fuel, and creating stable demand signals—are fundamentally financing and market-design issues rather than fuel chemistry issues.
INERATEC and early industrial reality
Within the Coalition, INERATEC represents one of the clearest examples of early industrialisation in Power-to-Liquid technology. The company is developing modular PtL systems that convert green hydrogen and captured CO₂ into synthetic fuels, with operational and near-operational facilities in Germany.
This positions INERATEC among the first European actors transitioning from demonstration-scale production towards early commercial deployment.
However, even here, scale-up remains structurally dependent on hydrogen availability. Without sufficient renewable electricity and electrolyser capacity, production growth cannot proceed regardless of downstream technological readiness.
Other Coalition members reflect the same structural constraint
Norsk e-Fuel is developing large-scale synthetic fuel projects in the Nordic region, where abundant renewable electricity offers a potential competitive advantage. Arcadia eFuels is advancing flagship developments such as its Danish project, aiming to establish commercial-scale PtL production. SkyNRG combines established SAF operations with emerging eSAF initiatives such as SkyKraft in Sweden.
ZAFFRA, a joint venture between Topsoe and Sasol, focuses on industrial-scale project development and execution, bringing refinery-grade engineering capability into synthetic fuel production.
Across all of these actors, the same structural constraint applies: hydrogen availability and renewable electricity supply ultimately determine scale.
Policy is moving faster than physical infrastructure
The European regulatory framework, particularly ReFuelEU Aviation, is creating binding demand trajectories for sustainable aviation fuels, including eSAF.
This is a critical development: it establishes long-term demand certainty.
However, upstream hydrogen infrastructure is not yet aligned with this demand curve. Electrolyser deployment, renewable generation build-out, and grid integration remain uneven across Europe.
This creates a structural mismatch between regulated demand growth and constrained supply-side infrastructure development.
As a senior European Commission official working on aviation fuel policy has noted in public discussions, policy can mandate fuel demand trajectories, but it cannot directly mandate the physical build-out of hydrogen production infrastructure required to meet them.
The rise of energy sovereignty as the dominant narrative
A notable shift in the sector is the framing of eSAF as part of Europe’s energy sovereignty agenda.
This is increasingly reflected in both industry communications and EU-level policy language: synthetic fuels are positioned not only as decarbonisation tools, but as strategic assets for reducing dependence on imported fossil fuels.
In this framing, hydrogen becomes enabling infrastructure for industrial autonomy rather than solely a climate solution.
This shift is material because it influences capital allocation, permitting prioritisation, and eligibility for public funding.
Hydrogen competition across the wider economy
Hydrogen is not a dedicated resource for aviation. It is a cross-sector input spanning steel, ammonia, chemicals, refining, shipping fuels, and power systems.
eSAF sits at the more complex end of hydrogen use cases because it requires hydrogen as an intermediate feedstock in a multi-stage synthetic fuel production chain.
This creates a systemic allocation challenge: limited renewable hydrogen must be distributed across competing industrial decarbonisation pathways.
How this allocation is resolved will determine whether eSAF becomes a meaningful industrial fuel segment or remains structurally constrained.
Conclusion: eSAF depends on hydrogen more than aviation
The European eSAF Coalition marks a significant step in industrial coordination and policy engagement for synthetic fuels. It reflects growing alignment between aviation decarbonisation goals and Europe’s broader energy security agenda.
However, the underlying system architecture remains unchanged. eSAF is a hydrogen-mediated fuel pathway, and its scalability depends primarily on the pace of green hydrogen expansion and renewable electricity deployment.
Industry leadership, including figures such as Jorgo Chatzimarkakis and executives across electrolyser manufacturing and project development, consistently reinforces a central point: the limiting factor is no longer chemistry, but the creation of bankable, large-scale hydrogen demand.
The fundamental equation therefore remains structural rather than rhetorical: if renewable hydrogen becomes abundant and investable at scale, eSAF can industrialise. If it does not, eSAF will remain confined to early deployment and demonstration-scale production.
The determining variable is not aviation. It is the speed and scale of the hydrogen economy that underpins it.
