Eneco and Corre Energy have signed a provisional agreement for the joint development of and investment in Corre Energy's first compressed air energy storage (CAES) project in Germany. This project. RWE Power is Germany's biggest power producer and a leading player in the extraction of energy raw materials. Credit: Maria Avvakumova/Shutterstock. Based on the ADELE concept (ADELE standing for the German acronym for adiabatic compressed air energy storage for electricity supply), air will be compressed during periods when. A utility majority owned by Japan's Mitsubishi has entered a pact to build a 220MW compressed air energy storage project in Germany.