Lhyfe Offshore is the division of Lhyfe — France’s pioneering green hydrogen producer — dedicated to producing hydrogen directly from offshore wind energy at sea. While Lhyfe’s onshore operations have progressed to commercial production (the company achieved its first commercial green hydrogen deliveries in 2021, making it one of Europe’s earliest commercial-scale green hydrogen producers), the offshore division represents a longer-horizon but potentially transformative technology bet: installing electrolyzers on or near offshore wind turbines, eliminating the need to transmit electricity to shore before converting it to hydrogen.
The flagship achievement of Lhyfe Offshore was the Sealhyfe project — the world’s first floating offshore hydrogen production system. Deployed in the waters off the coast of Saint-Nazaire (Loire-Atlantique) in 2022 and operated through 2023, Sealhyfe was a 1 MW electrolyzer system mounted on a semi-submersible floating platform, producing hydrogen from the electricity generated by a nearby offshore wind turbine. The project achieved its core technical objectives — demonstrating that offshore electrolysis is technically feasible, identifying the engineering challenges of operating electrolyzers in a marine environment, and gathering operational data that informs the design of commercial-scale systems.
France 2030 Funding & Projects
The Sealhyfe demonstrator received support from multiple France 2030-adjacent programs. The project was co-funded by Bpifrance, the European Commission through Horizon Europe (as part of the EC’s ambition to develop offshore hydrogen infrastructure), and the Pays de la Loire regional government. The combination of national and European funding reflects the cross-border nature of offshore wind development: France’s Atlantic coast is part of the same wind resource that the UK, Ireland, and the Netherlands are developing, and the ultimate market for offshore hydrogen will be pan-European.
Lhyfe Offshore has a pipeline of five planned offshore hydrogen projects across Europe by 2026, leveraging the Sealhyfe learnings to design larger, more cost-effective second-generation systems. These projects target the North Sea and Atlantic coast wind zones where France, Belgium, the Netherlands, Denmark, and the UK are all competing to establish offshore hydrogen supply chains.
The company’s participation in the European Clean Hydrogen Alliance and its connections to the IPCEI Hydrogen framework position it to access the coordinated European state aid that large offshore hydrogen infrastructure projects require — amounts that national programs alone cannot efficiently provide.
Technology & Innovation
The technical challenge of offshore hydrogen production is fundamentally different from onshore. Marine environments impose severe constraints on every system component: salt spray and humidity attack electrolysis membranes and electrical connections; wave motion creates dynamic loads that onshore equipment is not designed to handle; platform area and weight are severely constrained compared to an onshore industrial facility; and maintenance access requires offshore crew transfer operations that are expensive, weather-dependent, and safety-critical.
Lhyfe’s PEM electrolyzer technology — proton exchange membrane electrolysis, which produces high-purity hydrogen and responds quickly to variable power input — is particularly well-suited to the variable electricity profile of offshore wind turbines. Unlike grid-connected onshore electrolyzers that can smooth their power input through grid integration, offshore electrolyzers receive power directly from the co-located wind turbine, whose output varies with wind speed. PEM’s rapid response capability allows it to follow the wind turbine’s output curve without damaging the membrane or reducing efficiency.
The Sealhyfe system used a patented seawater desalination process integrated with the electrolysis unit — offshore hydrogen production requires fresh water for the electrolysis reaction, and a small desalination unit provides this from the surrounding seawater. This integrated desalination capability eliminates the need to supply fresh water from shore, a critical engineering choice for isolated offshore installations.
The next generation of Lhyfe Offshore systems is expected to scale from the 1 MW Sealhyfe demonstrator to 10 MW and eventually 50-100 MW installed capacity — the scale at which offshore hydrogen production begins to achieve cost competitiveness with onshore alternatives. Platform design, electrolyzer maintenance protocols, and hydrogen compression and storage solutions are the key engineering challenges being addressed in the next development phase.
Competitive Landscape
Offshore hydrogen production is an emerging technology with a small but growing number of players. Lhyfe’s primary competition comes from:
- Norwegian players: Nel Hydrogen and Aker Offshore Wind are developing offshore hydrogen production concepts, leveraging Norway’s offshore oil and gas engineering expertise.
- UK players: Ørsted (Danish but with major UK offshore wind operations) and ITM Power are exploring co-located offshore hydrogen production.
- Dutch and Belgian developers: Several consortia including DEME and Eneco are developing offshore hydrogen production systems for the North Sea.
Lhyfe’s competitive advantage is its first-mover position: Sealhyfe generated operational data that competitors developing only concept designs do not have. The learnings from 12+ months of offshore operation — electrolyzer degradation rates, maintenance requirements, system availability, interface challenges with the wind turbine’s electrical output — are proprietary and translate directly into lower-risk second-generation designs.
The broader offshore hydrogen market’s development depends on regulatory frameworks for offshore hydrogen installations (currently navigating between energy regulation and maritime safety regulation in most jurisdictions), port infrastructure for hydrogen loading and transport, and carbon pricing levels that make green hydrogen economically competitive with fossil alternatives.
France’s Offshore Position
France’s Atlantic coast and its exclusive economic zone (one of the world’s largest, including Pacific and Indian Ocean territories) provide a vast renewable energy resource for offshore hydrogen production. The French government’s offshore wind development ambitions — targeting 18 GW of installed offshore wind by 2030 — provide the potential upstream energy base for Lhyfe Offshore’s downstream hydrogen production.
The connection between France 2030’s hydrogen objectives and its deep-sea and renewable energy programs creates a natural policy alignment for offshore hydrogen: it simultaneously addresses green hydrogen supply, offshore wind utilization, and the exploration/development of France’s maritime economic zone — three separate France 2030 priority areas unified in a single technology pathway.
Related Companies
- Lhyfe — Parent company, onshore green hydrogen production
- H2V Industry — Industrial-scale onshore hydrogen, complementary
- Hynamics — EDF hydrogen subsidiary, hydrogen ecosystem
- RTE France — Grid operator, offshore wind connection infrastructure
- Engie — Offshore wind developer, potential hydrogen production partner