Mantle8 Raises $37M for Natural Hydrogen Drilling

Jan de Vries · 2026-05-13

Mantle8, a natural hydrogen exploration company based in Grenoble, France, has secured $37 million in Series A funding. This brings their total funding to $44 million as they push toward commercial production by 2030. ### Who's Backing This? The round was led by Sandwater, with participation from Breakthrough Energy Ventures, Ecotechnologies 2 fund (managed by Bpifrance for the French government), IP Group, Wind Capital, and Calderion. These investors see natural hydrogen as a game-changer for clean energy. ### What's the Big Deal? Emmanuel Masini, founder and CEO of Mantle8, put it simply: "This raise reflects the growing conviction among leading clean tech investors that natural hydrogen is a resource worth pursuing at scale." He's right. We've known natural hydrogen exists for decades, but finding commercially viable deposits has been the real challenge. Mantle8 claims their tech can spot those deposits with much less risk and cost. Their models suggest production costs could drop to around $0.87 per kilogram, which would make clean hydrogen way more affordable. ### How Their Tech Works Mantle8 built a proprietary platform called HOREX that creates 4D images of underground hydrogen systems. They also use something called the Geological Trifecta, which identifies spots where three things come together: - An active hydrogen-generating source - Continuous replenishment of that hydrogen - A sealed reservoir that traps it all This approach reduces exploration risk and speeds up the process. Instead of drilling blindly, they can pinpoint the most promising sites first. ### The Bigger Picture Hydrogen is a big part of the future clean energy mix, but its role depends on cost and origin. If Mantle8 can deliver cheap, clean hydrogen, it could change the entire sector. Europe, in particular, needs sovereign energy sources, and natural hydrogen could be a huge piece of that puzzle. Tom Even Mortensen from Sandwater said: "Natural hydrogen sits at the intersection of energy transition and resource discovery, two areas where Europe must lead." He sees outsized potential in this company. ### What's Next? Over the next two years, Mantle8 plans to run the world's most advanced natural hydrogen exploration and drilling campaign. They'll use their tech to rank opportunities globally, then drill to confirm volumes, purity, and reservoir quality. Bart Markus, Mantle8's chairperson, added: "The next two years are about proving that the active hydrogen systems our technology has pinpointed can deliver sustained, commercially viable flow." The company already raised $3.7 million in seed funding back in 2025, so they've been building momentum for a while. Now with this Series A, they have the firepower to move from exploration to commercial development. ### Why This Matters for Investors For professionals tracking EU startup news, Mantle8 represents a bet on a new energy source that could reshape the hydrogen market. If successful, natural hydrogen could provide a low-carbon, cost-effective alternative to green hydrogen produced via electrolysis. The company's focus on sovereign energy supply also aligns with broader geopolitical trends. Europe wants to reduce reliance on imported energy, and natural hydrogen could help achieve that goal. ### The Bottom Line Mantle8 has a clear plan, strong investor backing, and proprietary technology. The next two years will be critical as they prove their approach works at scale. If they succeed, natural hydrogen could become a major player in the clean energy transition.