Vallourec, based in Meudon, France, has achieved a significant milestone with the qualification of its innovative hydrogen storage solution named Delphy. This vertical gaseous hydrogen storage system has the capacity to store 1 to 100 tons of hydrogen under rigorous safety conditions. The compact design, extending up to 100 meters underground, caters to complex industrial environments, offering a solution for green hydrogen producers, synthetic fuel manufacturers, steelmakers, and refineries. The development of Delphy involved extensive research and collaboration with experts in various technical aspects, ensuring tightness and corrosion resistance of the storage system. With the recent qualification by DNV, a renowned certification body, Vallourec is set to commercialize Delphy globally, targeting industries that require efficient hydrogen storage solutions. Vallourec has already established partnerships with companies like H2V and NextChem Tech for green hydrogen and green ammonia projects, indicating a promising future with potential revenues estimated at around €2 billion from ongoing discussions for fifty projects. This qualification comes at a crucial time when the demand for hydrogen storage infrastructure is on the rise to support the intermittent nature of green hydrogen production and comply with European regulations and national strategies. Philippe Guillemot, the Chairman and CEO of Vallourec, expressed the company's commitment to driving global decarbonization efforts through innovative energy solutions like Delphy. The positive sentiment is echoed by Santiago Blanco from DNV, emphasizing the importance of such scalable hydrogen storage solutions in meeting the future demand for renewable hydrogen. This achievement positions Vallourec as a key player in the hydrogen market, showcasing its leadership in supporting sustainable energy transitions. The qualification of Delphy not only highlights technological advancement but also underscores the critical role of hydrogen in the ongoing shift towards cleaner energy sources.