The overall objective of the QualyGridS project is the establishing of standardized tests for electrolysers performing electrical grid services. Alkaline electrolysers as well as PEM electrolysers will be considered individually in performance analysis and in an assessment of business cases for these electrolysers’ use. A variety of different grid services will be addressed as well as multiple hydrogen end users. The protocols developed will be applied to alkaline and PEM electrolysers systems, respectively, using electrolyser sizes from 50 kW up to 300 kW. Additionally, a techno-economic analysis of business cases will be performed covering the grid and market situations in the most relevant regions of Europe. The consortium adressing these tasks includes three electrolyser manufacturers and well as research institutions with plenty of experience. Inclusion of a European standardisation institution will allow for maximum impact of the protocols. An advisory committee including TSOs from several countries and a key player in US electrolysis research will support the project with valuable advice. Experience from previous FCH-JU electrolyser projects and national projects is available to the project.