The DELYCIOUS project, initiated by a consortium of eight European partners, aims to advance water electrolysis technology for green hydrogen production. Coordinated by the Fraunhofer Institute for Wind Energy Systems IWES in Hamburg, Germany, the project focuses on developing diagnostic tools for water electrolysers with the goal of extending their lifespan and reducing operational costs, especially under the variability of renewable energy sources. The project integrates innovative approaches such as Raman and Electrochemical Impedance spectroscopies with advanced modeling, validated across major electrolysis technologies including alkaline, proton exchange membrane, and solid oxide electrolysis. The consortium's expertise spans various areas, from large-scale validation testing to performance analysis, modeling, and development of control systems and software solutions. DELYCIOUS is expected to contribute significantly to Europe's clean energy goals by advancing scientific knowledge in electrolyser diagnostics, training new experts, and strengthening Europe's position in the renewable hydrogen market. By 2035, a significant portion of water electrolysis capacity in the EU is projected to utilize DELYCIOUS technology, highlighting its potential impact on the industry's future. The project kickstarted successfully with a kickoff meeting in January 2025, setting the groundwork for administrative and technical aspects, emphasizing effective communication, data management, and coordination strategies across electrolysis technologies. Funded by the Clean Hydrogen Partnership and the European Union, DELYCIOUS is set to run until the end of 2027, with the aim of making green hydrogen production more efficient and cost-effective.