FDE Confirms Major Natural Hydrogen Breakthrough in Lorraine
FDE has announced a significant breakthrough in natural hydrogen exploration in France’s Lorraine region, confirming exceptionally high in-situ hydrogen concentrations at extreme depths and accelerating plans to develop what could become the world’s first industrial-scale natural hydrogen production project.
The independent low-carbon energy producer said results from its PTH-2 well in the Moselle Basin represent a major milestone in understanding and validating large-scale natural hydrogen systems. The well, drilled to a depth of 3,655 metres under the REGALOR II research programme, is currently the deepest in the world dedicated exclusively to natural hydrogen exploration.
According to FDE, post-drilling analysis of dissolved gas samples taken from depths of more than 2,000 metres confirmed hydrogen concentrations of 36.1% at 2,242 metres and 49.6% at 2,426 metres. The company said these figures are among the highest natural hydrogen concentrations ever recorded in situ globally, significantly strengthening the commercial potential of the resource.
The findings build on earlier discoveries in the region, including measurements at the Folschviller site, where dissolved hydrogen levels of around 20% were identified at 1,200 metres. FDE said the latest results reinforce the theory that hydrogen concentrations increase with depth, suggesting the presence of an active and potentially extensive underground hydrogen generation system across the Lorraine region.
A key technological milestone was also achieved through the successful deployment of FDE’s proprietary SYSMOG™ membrane separation probe, developed in partnership with Solexperts. The system operated under extreme conditions at depths of up to 3,000 metres, enabling accurate detection and sampling of dissolved hydrogen in deep geological formations. The company said this validates a critical tool for future exploration and production development in the emerging natural hydrogen sector.
FDE, which describes itself as an independent low-carbon energy producer, is now advancing both its REGALOR II programme and its wider exploration strategy under the “Trois Evêchés” permit covering 2,254 km² in eastern France. The group is transitioning from scientific validation towards industrial development, with a focus on building Europe’s first integrated natural hydrogen value chain.
The company has already initiated feasibility work with TEREGA Solutions to design future production facilities and assess integration into regional energy infrastructure. In parallel, additional in-situ flow measurements are planned for the second half of 2026 using SYSPROG™ technology to evaluate potential production performance at depths below 3,000 metres.
FDE expects to begin a formal independent resource certification process in 2027, a key step in confirming commercial viability. Subject to successful development milestones, the company is targeting the start of natural hydrogen production in late 2028 or early 2029.
Chief Executive Officer Antoine Forcinal said the results from PTH-2 mark a turning point for both the company and the wider industry, shifting natural hydrogen from scientific theory towards industrial reality.
He said the data significantly reduces geological and technical uncertainty and strengthens confidence that eastern France could become a strategic hub for natural hydrogen production, supporting Europe’s energy security and industrial decarbonisation goals.
As global demand grows for new low-carbon energy sources, FDE’s latest results position natural hydrogen as a potential emerging contributor to Europe’s future energy mix, with implications for energy sovereignty, emissions reduction and long-term supply diversification.
