The main page of the CEEGS project: https://ceegsproject.eu/
Press release: New EU research project CEEGS aims at combining underground electricity storage with CO2 sequestration: https://ceegsproject.eu/2023/01/17/press-release-new-eu-research-project-ceegs-aims-at-combining-underground-electricity-storage-with-co2-sequestration/