This operation complements the ARD Lavoisier phase2. This ARD concerns scientific and technical actions designed to contribute to the development of energy chains related to hydrogen energy and the storage of electricity. These are 4 major research and development themes that are affected by the investments and actions requested: Action 1 – CALHYPSO: hyperbar gas storage of hydrogen through the development of Type IV tank (composite shell polymer) -Action 2 – HYTEMPE: production of hydrogen by high temperature electrolysis (typically 700 °C) of water vapour -Action 3 – SE²A: electricity storage, contribution to improving the safety of Li-ion battery electrolytes -Action 4 – INPACT: development of PEMFC fuel cell components