A Successful World First for Natural Hydrogen Success of the PTH-2 well dedicated to natural hydrogen: FDE confirms new occurrences of natural hydrogen and accelerates the characterization of the basin

A Successful World First for Natural Hydrogen Success of the PTH-2 well dedicated to natural hydrogen: FDE confirms new occurrences of natural hydrogen and accelerates the characterization of the basin A Successful World First for Natural Hydrogen Success of the PTH-2 well dedicated to natural hydrogen: FDE confirms new occurrences of natural hydrogen and accelerates the characterization of the basin Pontpierre, France – 23 mars 2026 – La Française de l’Énergie (Euronext : FDE – ISIN : FR0013030152), a local low-carbon energy producer, announces the successful completion of the PTH-2 deep drilling project, carried out as part of the REGALOR II research program, and confirms the significant presence of natural hydrogen in the subsurface of the Moselle department, Grand Est region. Key takeaways : - PTH-2 drilling completed at 3,655 m: successful drilling dedicated to natural hydrogen, currently the deepest in the world - Natural hydrogen confirmed in numerous intervals, following up on the discovery made at Folschviller in 2023; 58 samples were collected directly at the surface during drilling - Comprehensive formation evaluation program: core sampling and in-depth logging - Leading technical partners involved in this project: RED Drilling, SLB, Baker Hughes, and Weatherford contributed their expertise to the drilling operations and associated services Next steps : - Continuation of scientific work under the REGALOR II program to measure dissolved hydrogen concentrations and to test, in situ, the water-hydrogen separation tools developed in partnership with Solexperts and the GéoRessources laboratory, with support from Saint-Gobain - Acceleration of studies at the scale of the Exclusive Exploration Permit (PER) known as the “Trois Évêchés”: preparation of upcoming appraisal wells to determine the extent, volume, and technical and economic conditions for developing the deposit A strategic milestone for FDE and the natural hydrogen sector Following the discovery of dissolved natural hydrogen (“white” or “native”) at the Folschviller well in 2023, FDE launched the REGALOR II program with support from the Grand Est Region and the European Union to better understand the generation system of this carbon-free energy, assess its presence, and prepare the characterization steps necessary for any potential utilization. Drilling of the PTH-2 well achieved all of the set objectives at a final depth of 3,655 meters : - Confirm and better understand the mechanisms governing the formation of dissolved hydrogen in the underground aquife - Measure key parameters, including the dynamics of this hydrogen’s formation - Collect the data necessary for future certification work prior to potential industrial development - Evolve the detection probes into production tools patented by FDE and its partners Confirm, understand, measure: key findings from the PTH-2 drilling project This hydrogen-specific well, currently the deepest in the world, has confirmed the presence of natural hydrogen in numerous intervals of the sedimentary basin. During this new phase of exploration, FDE identified several zones containing natural hydrogen and acquired a comprehensive set of geological data to better understand the mechanisms of formation and migration of this low-carbon energy source. This pioneering work has enabled the Group to strengthen its expertise and develop specific procedures—drilling, cleaning, casing retrieval, data acquisition, and sampling—designed to optimize future exploration campaigns in France and internationally. FDE thus aims to establish itself as a leading player in the exploration and production of natural hydrogen, thanks to its standardized approach. Next steps: Continuation of REGALOR II, work on the Trois-Évêchés permit, and international expansion By the end of April, the PTH-2 well will be equipped with the SYSMOG™ probe to conduct in-situ measurements of dissolved hydrogen concentration, and subsequently with the SYSPROG™ probe to test membranes designed to separate hydrogen and water at depth. At the same time, after obtaining the European largest exclusive research permit for natural hydrogen—known as the “3 évêchés” and covering an area of 2,254 km²— FDE will be able to study the entire basin to delineate its extent, assess its potential, and begin preparatory work for an initial certification targeted for 2027. FDE’s progress has attracted interest from other regions and several countries. The Group has therefore initiated discussions aimed at launching research programs tailored to local conditions in Germany, Luxembourg, and the former mining basin of Pas-de-Calais. Finally, building on this success, FDE is launching its program to assess the potential of its permits in a particularly promising area in the United States, in the state of Kansas, where the Group plans to deploy its SYSMOG and SYSPROG tools in upcoming wells starting in the second half of 2026. READ the latest news shaping the hydrogen market at Hydrogen Central A Successful World First for Natural Hydrogen Success of the PTH-2 well dedicated to natural hydrogen: FDE confirms new occurrences of natural hydrogen and accelerates the characterization of the basin, source