Hydrogen for the test was generated using wind and tidal power from the Orkney Islands of Scotland and was supplied by EMEC (European Marine Energy Centre).
https://www.techspot.com/news/96809-rolls-royce-demonstrates-hydrogen-powered-jet-engine.html?utm_source=dlvr.it&utm_medium=blogger
https://www.techspot.com/news/96809-rolls-royce-demonstrates-hydrogen-powered-jet-engine.html?utm_source=dlvr.it&utm_medium=blogger