A consortium of eight European partners has launched the DELYCIOUS research project aimed at developing advanced diagnostic and monitoring tools for water electrolysers. Coordinated by Fraunhofer IWES, the project focuses on extending electrolyser lifespans and reducing operational costs under variable renewable energy sources. The project integrates innovative spectroscopies and modeling to validate tools across major electrolysis technologies, with expected impacts including advancing scientific knowledge, building capacity, contributing to renewable hydrogen production, and strengthening Europe's position in the market. The consortium partners bring complementary expertise, with each playing a strategic role. By 2035, it is projected that 10% of water electrolysis capacity in the EU will use DELYCIOUS technology, showcasing its potential widespread adoption and impact.