Lhyfe, which has inaugurated the world’s first site for the production of hydrogen from onshore wind turbines in September 2021 and which is currently preparing to deploy its solutions Europe-wide, is convinced of the central role offshore has to play in the massification of renewable green hydrogen production. Producing hydrogen using offshore wind turbines could allow all countries with a coastline to access renewable green hydrogen, produced locally, beyond the horizon line, and in industrial quantities, to decarbonize transportation and industry. However, until now, no one has ever produced hydrogen at sea. It is to prove that it is now possible that Lhyfe is today taking on the great offshore challenge. Through this pilot site, Lhyfe will produce the first kilograms of renewable green hydrogen at quay and then at sea, operating automatically, in the most extreme conditions. The company has voluntarily set the bar high by installing its production unit on a floating platform, connected to a floating wind turbine. The Sealhyfe platform must therefore meet several major and unprecedented challenges, including: Performing all stages of hydrogen production at sea, i.e. converting the electrical voltage from the floating wind turbine, pumping, desalinating and purifying seawater, and breaking the water molecules via electrolysis to obtain renewable green hydrogen Managing the effects on the system of the platform’s motion: list, accelerations, swinging movements, etc Enduring environmental stress: Sealhyfe will have to survive the premature ageing of its parts (corrosion, impacts, temperature variations, etc.) Operating in an isolated environment: the platform must operate fully automatically, without the physical intervention of an operator, except for scheduled maintenance periods which have been optimally integrated from the design phase The production unit was installed on the WAVEGEM wave energy platform developed by Geps Techno. At the end of the quayside test phase, the Sealhyfe platform will integrate the SEM-REV offshore testing area, off the coast of Le Croisic, about 20 kilometres from the coast. The device will then be supplied with electricity by the pioneering floating wind turbine installed within the offshore test site in 2018 and still unique in France today. The electrolyser was supplied and optimized for these exceptional operating conditions by Plug Power, one of the market leaders that is strongly engaged in the offshore route. Together, Plug and Lhyfe have developed the first electrolyser capable of operating on a floating platform.