ReFuelEU Aviation Regulation and the Hydrogen Feedstock Bottleneck

The International Air Transport Association’s forecast of 5 million litres of SAF production in 2026—with 70 percent derived from hydroprocessed esters and fatty acids (HEFA)—reveals a structural constraint: HEFA pathways require significant hydrogen input for hydrotreatment, yet renewable hydrogen capacity remains scarce and expensive. ReFuelEU Aviation’s blending mandates, which ratchet upward through 2030 and beyond, are intensifying competition for green hydrogen between refiners, e-fuel producers, and other industrial users. This bottleneck is creating renewed interest in unconventional hydrogen sources, including natural hydrogen deposits that require no electrolysis infrastructure.

Belgium’s BE.Hydrogen programme, led by Belspo and the GSB geological survey under Minister Crucke’s oversight, has been investigating the potential for white hydrogen accumulations in the Hercynian basement beneath the country’s former coal basins. Early geochemical surveys suggest serpentinisation and radiolysis reactions in these ancient crystalline rocks could generate continuous hydrogen flows—an entirely different supply profile from electrolytic production. If proven commercial, such deposits would offer airlines and fuel blenders a compliance pathway that bypasses the capital intensity and grid constraints of electrolysis at scale.

Belgian Coal Basins as Strategic Feedstock Reserves

The same subsurface architecture that once made Belgium a coal power now positions its geological resources as potential hydrogen assets. The Greater Region spanning Wallonia, Luxembourg, and neighbouring France contains extensive Carboniferous strata overlying Precambrian and Palaeozoic basement complexes where hydrogen-generating reactions are most likely. GSB’s seismic and drilling campaigns are employing digital twin modelling and AI-driven anomaly detection to identify hydrogen migration pathways and seal integrity—precisely the kind of data-intensive geoscience that justifies the .ai domain extension for platforms like behydrogen.ai. These optimisation techniques, borrowed from hydrocarbon exploration, allow researchers to prioritise target zones and reduce exploration risk, aligning geological prospecting with the iterative, algorithm-driven workflows characteristic of modern energy data science.

As ReFuelEU mandates tighten and SAF production scales, the economic threshold for natural hydrogen extraction falls. A commercially viable Belgian hydrogen field could supply domestic e-fuel plants or export to neighbouring aviation hubs, diversifying the feedstock mix and reducing reliance on intermittent renewable electricity. This would not only support Belgium’s own climate commitments under RED III but also strengthen the country’s role in the pan-European hydrogen economy.

Policy Convergence and the Role of Technical Performance Metrics

The convergence of ReFuelEU Aviation’s blending targets and RED III’s renewable hydrogen definitions creates a regulatory environment where geological hydrogen—if certified as low-carbon—could qualify for certain incentives. Performance metrics such as well productivity rates, hydrogen purity, and lifecycle emissions intensity will be critical in determining whether natural hydrogen can compete with electrolytic alternatives. Advanced sensor networks, machine learning-based flow optimisation, and real-time geochemical monitoring form the backbone of this assessment framework, underscoring the importance of data analytics in validating the commercial and regulatory viability of Belgium’s hydrogen geology. The BE.Hydrogen programme’s emphasis on rigorous measurement and digital integration positions it to deliver the technical evidence needed for policy recognition and investor confidence.

Sources

• Sustainable Aviation Fuel Market – Global Forecast 2026-2032 Now Available
• IATA warns SAF growth remains too slow despite higher production forecast for 2026
• News Roundup July 2026

Featured image via Unsplash.