H2ELIOS: From validation to regulatory readiness in hydrogen aviation
As H2ELIOS progresses through its final phase, the project continues to consolidate technical achievements while strengthening its contribution to Europe’s pathway toward hydrogen-powered aviation. Building on strong scientific foundations, the consortium is now demonstrating validated performance, regulatory alignment, and system-level maturity in liquid hydrogen (LH₂) storage technologies for next-generation aircraft.
A significant milestone in this journey was the participation of H2ELIOS partners at the EASN 2025 Conference, held from 14–17 October 2025 in Madrid, Spain. Representatives from the Norwegian University of Science and Technology (NTNU), the University of Patras, and Fraunhofer ENAS presented recent research outcomes from the project, highlighting advances in hydrogen storage systems, cryogenic materials, and structural behaviour under extreme temperature conditions. Their contributions reinforced the scientific robustness of the project and its alignment with Europe’s ambition for zero-emission aviation.
In parallel, the release of the H2ELIOS Newsletter Vol. 03 marked an important step in communicating key validated technical outcomes. Among the highlights was the selection of the Separated System Bay Architecture, a strategic configuration chosen to optimise safety, performance, and integration within hydrogen-powered aircraft platforms. The newsletter also detailed the successful completion of the 900-cycle cryogenic durability challenge, demonstrating structural robustness and material reliability under repeated extreme thermal conditions. Furthermore, the approval of the EASA Means of Compliance represents a major regulatory milestone, confirming that the project’s developments are aligned with certification pathways and future aircraft integration requirements.
Together, these achievements reflect the project’s transition from research-driven innovation to certification-oriented maturity. As H2ELIOS approaches completion, the consortium remains focused on final validation activities, regulatory consolidation, and the dissemination of high-impact results within the hydrogen aviation ecosystem. Through sustained collaboration across research institutions, industry partners, and regulatory frameworks, H2ELIOS continues to contribute essential building blocks for safe, efficient, and certifiable LH₂ storage solutions supporting climate-neutral aviation.
Discover more about H2ELIOS and stay informed about upcoming milestones. Visit the official website and connect with the project on LinkedIn, X, and YouTube.
The project is supported by the Clean Aviation Joint Undertaking and its members.
Funded by the European Union. Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or Clean Aviation Joint Undertaking. Neither the European Union nor Clean Aviation JU can be held responsible for them.