The overall objective of the QualyGridS project is to establish standardized testing protocols for electrolysers to perform electricity grid services. Alkaline electrolysers and PEM electrolysers will both be considered within the QualyGridS project. A variety of different grid services will be addressed as well as multiple hydrogen end users. The protocols developed will be applied to both alkaline and PEM electrolysers systems, respectively, using electrolyser sizes from 50 kW 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 for large electrolysers (>3MW). Testing protocols and economic analysis will also include the review of existing and possibly set‐up of new Key Performance Indicators (KPI) for electrolysers.