Sealhyfe commences production of green hydrogen in the Atlantic Ocean

Lhyfe has announced that its offshore hydrogen production pilot, Sealhyfe, was successfully towed 20 km out into the Atlantic and connected with the SEM-REV power hub. As of 20 June, the platform began producing its first kilograms of hydrogen, marking a decisive milestone for the future of the sector.

The progress of the Sealhyfe trial once again demonstrates Lhyfe’s ability to bring about concrete advances in the hydrogen industry and at great strides.

In launching the world’s first offshore hydrogen production pilot, Lhyfe wanted to prove the technical feasibility of such a project and acquire the operational experience needed to quickly scale up.

The company therefore voluntarily chose to confront Sealhyfe with the toughest conditions. It will be tested under real conditions, on a floating platform, which has been re-engineered to stabilise the production unit at sea (the WAVEGEM platform, engineered by GEPS Techno), and connected to Central Nantes’ SEM-REV offshore testing hub operated by the OPEN-C Foundation, which is already linked with a floating wine turbine (FLOATGEN, engineered and operated by BW Ideol).

For this, Lhyfe and its partners designed, built and assembled all of the technology necessary for producing hydrogen offshore, including the 1 MW electrolyser supplied by Plug, in just 16 months. The  Sealhyfe platform, which measures less than 200 m2 in area, is capable of producing up to 400 kilograms of hydrogen a day.

Eight months of trials at quay to ‘derisk’ this world first

From September 2022 to May 2023, Sealhyfe was moored at the Quai des Frégates, in the Port of Saint-Nazaire, allowing Lhyfe and its partners to draw knowledge from a series of start-up tests in order to approach the second phase of the project with confidence, and get the most out of the trials. Tests included:

  • Benchmarking tests: Hundreds of tests were carried out at quay recording the precise behaviour and performance of the platform, so that they can be compared with the Phase 2 trial results via the thousands of sensors installed on the platform.
  • Technology and system optimisation: All of the technology has been adapted to operate offshore in extreme conditions and designed to minimise the number of maintenance interventions required at sea. The tests performed at quay allowed Lhyfe to further optimise and approve the technology’s behaviour.
  • Development of key solutions: Lhyfe also developed the software and algorithm building blocks necessary to manage the site remotely. It will operate fully autonomously, more than 20 kilometres off the coast and in connection with the SEM-REV testing site’s subsea hub.

Following this first phase, Lhyfe has already updated its specifications for all its sites – onshore and offshore – so that they can apply this valuable expertise. All Lhyfe units will therefore benefit from the state-of-the-art operating optimisations trialled under this experiment.

Start of offshore production: millions of data to collect

Sealhyfe was towed on 19 May to the SEM-REV offshore testing site, 20 kilometres off the coast of Le Croisic, France. It was then connected to the site’s subsea hub via a dedicated umbilical cable that was specially designed for the hydrogen application. The system was restarted and on stream in just 48 hours.

Lhyfe will now reproduce all of the tests carried out at quay several times in order to have a strict comparison of results and will then tackle additional offshore-specific tests.

In achieving the reliable offshore production of hydrogen in an isolated environment, the company will develop a unique operating capability which involves managing the platform’s movement and environmental stresses, and validating green and renewable hydrogen production software and algorithms.

Kick-off for offshore hydrogen production: next steps

As a logical follow-up to this first stage, Lhyfe just announced that the HOPE project, which it is coordinating as part of a consortium of nine partners, has been selected by the European Commission under the European Clean Hydrogen Partnership and is being awarded a €20 million grant. With HOPE, Lhyfe and its partners are moving up a gear and aiming for commercialisation. This unprecedentedly large-scale project (10 MW) will be able to produce up to four tonnes a day of green hydrogen at sea, which will be exported ashore by pipeline, and then compressed and delivered to customers.

Through these two pioneering projects in offshore hydrogen production, Lhyfe aims to validate industrial solutions which it will submit in response to future calls for projects from various governments, to help achieve the target set by the European Commission as part of the REPowerEU plan of 10 million tonnes of clean hydrogen produced in the European Union by 2030.

To achieve this, Lhyfe has already signed partnership agreements with wind turbine developers and offshore power specialists, such as EDPR, Centrica and Capital Energy.

Matthieu Guesné, founder and CEO of Lhyfe, said: “Our team – supported brilliantly by our partners – has achieved a genuine feat of technology in successfully designing this first floating green hydrogen production site. We are extremely proud to be the first in the world to produce hydrogen at sea. This has been our wish since the launch of the company and we continue to move very quickly on offshore, which for us represents a tremendous development opportunity for mass producing hydrogen and decarbonising industry and transport. We are continuing to build on the successes we have had so far, firstly to prove to the world that transition is possible today, and of course to accelerate it.”

HTW Editorial Team

HTW Editorial Team

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