Uniper Energy Storage will test the construction and operation of a new salt cavern specifically built for hydrogen storage on a large-scale and in a real-world environment at the natural gas storage facility in Krummhoern, Northern Germany, which has not been used commercially since 2017. For this purpose, a new pilot cavern will be constructed using an existing well. During the trial operation, equipment and materials will be examined for hydrogen compatibility, and experience will be gained in the storage of exclusively green hydrogen in a salt cavern and its delivery and further use.