Recently, Vallourec, a global leader in premium seamless tubular solutions, announced that its vertical gaseous hydrogen energy storage solution, Delphy, has officially passed DNV verification. As a globally pioneering solution, Delphy can store hydrogen ranging from 1 to 100 mt under the highest safety standards. This vertical system can extend up to 100 meters underground, occupying minimal land area, and is capable of meeting the challenges of complex and demanding industrial environments. Its target customers include green hydrogen producers, as well as industrial enterprises such as synthetic fuel (e-SAF, e-methanol) producers, green ammonia producers, steel companies, and refineries.
The Delphy solution stems from Vallourec's long-term professional expertise and technological accumulation. Based on practically verified tubular and connection technologies, it exhibits excellent sealing and corrosion resistance. The project was initiated in 2022, bringing together approximately 30 researchers and experts, with particular emphasis placed on high-precision rebar processing, heat treatment, and non-destructive detection. In December 2023, the demonstration project for this solution was completed. Subsequently, Vallourec conducted a rigorous development, testing, and verification process for its hydrogen storage technology, ultimately leading to the successful verification of Delphy in recent days. This conformity statement issued by authoritative experts fully ensures the safety and reliability of the solution, marking a crucial milestone towards its commercialization.
With the endorsement of authoritative verification, Vallourec has signed two Memoranda of Understanding (MoUs) with customers: one with H2V for green hydrogen production and utilization projects, and another with NextChem Tech for advancing green hydrogen and green ammonia projects. Currently, approximately 50 projects are under negotiation in France and globally, with potential revenue reaching around 2 billion euros.
This verification result comes at a time when the demand for energy storage infrastructure is expected to grow—driven by the intermittent and flexible nature of green hydrogen production. The market demand for Delphy's energy storage solution will be propelled by both European regulations (requiring energy storage solutions to be paired with renewable electricity production) and France's hydrogen strategy (encouraging green hydrogen producers to operate flexibly to contribute to power grid stability).
Philippe Guillemot, Chairman and CEO of Vallourec Group, stated: "The successful verification of Delphy underscores Vallourec's ability to transform industrial and technological expertise into new energy solutions. Thanks to the outstanding performance of our team, we have been able to launch this unique solution to address the challenges of global hydrogen energy development. This crucial milestone also solidifies our position in the hydrogen energy market and our leadership role in supporting the global decarbonization process."
Santiago Blanco, Executive Vice President and Regional Director for Southern Europe at DNV Energy Systems, commented, "DNV is honored to provide validation services for Vallourec's Delphy hydrogen storage solution - a significant milestone in the field of safe and scalable hydrogen infrastructure. According to our Energy Transition Outlook model, the global demand for hydrogen is projected to reach 188 million mt per year by 2050. Flexible energy storage solutions like Delphy are crucial for bridging the gap between renewable energy supply and industrial demand. As hydrogen energy enables decarbonization in industries that are difficult to electrify, independent technical testing and validation will be key to accelerating deployment and building market confidence."
About Vallourec
Vallourec is a global leader in premium seamless tube solutions for the energy market and demanding industrial applications, with products spanning oil and gas wells in harsh environments, next-generation power plants, high-demand construction projects, and high-performance machinery equipment. Its pioneering spirit and cutting-edge R&D capabilities continuously push the boundaries of technology. With nearly 13,000 dedicated and passionate employees in over 20 countries worldwide, Vallourec collaborates with customers to provide not just tubular products, but innovative, safe, and cost-competitive smart tubular solutions that make every project possible.
About DNV
DNV is an independent certification and risk management services provider with operations in over 100 countries. Leveraging extensive experience and profound expertise, DNV is committed to enhancing safety and sustainable performance, setting industry standards, and inspiring and creating innovative solutions. Whether it's assessing new ship designs, providing certification for floating wind farm technologies, analyzing natural gas pipeline sensor data, or certifying food company supply chains, DNV empowers clients and their stakeholders to confidently navigate technological and regulatory complexities.
DNV provides assurance across the entire energy value chain through consulting, monitoring, validation, and certification services. As a leading global independent energy expert and technical advisor resource, it helps industries and governments navigate the numerous complex and interconnected transformations occurring in the global and regional energy sectors. DNV is dedicated to achieving the goals of the Paris Agreement and supporting clients in their transition to a deeply decarbonized energy system at a faster pace.
