Demonstration of the operation and performance of a pressurised alkaline electrolyser operating in the hydrogen fuelling station in Porsgrunn, Norway

•Hydrogen filling station at Porsgrunn, Norway is demonstrated.•The pressurised electrolyser was operated in different modes.•The behaviour of the electrolyser and its characteristics are explained.•This data could be used to model electrolysers in electrical power systems.•The information could also be used to find appropriate control strategies to run electrolysers.