• Hydrogen storage in salt cavern: mature technology; current status and outlooks
• Hydrogen storage in porous reservoirs: past experience and recent pilots for the storage of H2 blends; status of the technical developments under way for pure H2 storage (no showstopper identified)
• Hydrogen storage in lined mined cavern: an innovative storage, less geology dependent; status of the R&D studies and Technology development pathway
• Hydrogen storage after its transformation into a liquid carrier
• Perspective of underground storage in the coming year