Mantle8 Wins Five-Year Hydrogen Permit in French Pyrenees

Mantle8 has won a five-year hydrogen and helium exploration permit in the French Pyrenees, giving the French start-up access to a 739km2 area as it begins pilot detection and quantification work. The company says the program will feed its Hydrogeco demonstration project and move it toward geophysical surveys before any request to drill.

739km2 is the scale of the block now open to Mantle8, and the permit follows the company’s earlier detection of an active hydrogen generating source in the mountain range. The source is said to replenish sealed reservoirs, a feature that keeps the area in play for further exploration rather than closing the book on the find.

Pyrenees permit opens surveys

The permit allows Mantle8 to conduct geophysical surveys before seeking final approval to start drilling. That is the operational step that turns a broad exploration right into a test of whether the company can map subsurface structures well enough to move from detection to a drilling decision.

Last month, Mantle8 raised €31m ($35.9m) in Series A funding to finance exploration and drilling programmes. The financing gives the company capital to push into fieldwork just as it gains formal access to one of the more watched natural hydrogen areas in Europe.

Hydrogeco tests the model

Over 40 exploration companies have entered the natural hydrogen space since 2020, up from just a handful, as the sector tries to turn an early geological thesis into commercial resources. Many proponents argue wellhead production costs could be about 50% lower than grey hydrogen production, but the extraction technologies are still undetermined.

Mantle8 has not set out estimated hydrogen volumes, reservoir sizes, expected production rates, or economic assessments, so the permit is a technical milestone rather than a reserve announcement. The company says Hydrogeco is meant to characterise and quantify natural hydrogen resources and to validate its detection and quantification technologies, with work alongside research institutions, technical partners, transportation operators, and downstream offtakers.

France backs early-stage drilling

The practical takeaway is narrow but important: Mantle8 now has five years to test whether the Pyrenees block can justify drilling, and the next visible step is the geophysical survey phase. If those surveys sharpen the target enough, the company can move from a permit on paper to a request for final approval to drill.