The DELYCIOUS research project, launched by a consortium of European partners, aims to optimize the operation of renewable hydrogen production units. The initiative, coordinated by Fraunhofer IWES in Hamburg, focuses on developing diagnostic tools for water electrolysers to address challenges in extending electrolyser lifespans and reducing operational costs under variable renewable energy sources. By integrating Raman and Electrochemical Impedance spectroscopies with advanced modelling, the project pioneers innovative approaches validated across major electrolysis technologies, including alkaline, PEM, and solid oxide electrolysis. Expected impacts encompass advancing scientific knowledge, capacity building, and contributing to the development of renewable hydrogen production in Europe. The strategic roles of consortium partners from Germany, France, Italy, Estonia, and the Netherlands highlight complementary expertise across the value chain. The project kickoff meeting emphasized administrative structures, technical aspects, and outlined key milestones for the project, projecting a significant adoption of DELYCIOUS technology by 2035 in the EU.