In mid‑March, the filling of the two caverns at the H2CAST Etzel pilot project was successfully completed by the leading consortium partners STORAG ETZEL and Gasunie with approximately 90 tonnes or 1 million standard cubic metres of hydrogen. By emptying the 200th trailer the full hydrogen amount for H2CAST pilot was in place.

Further milestone in the conversion of existing caverns for hydrogen use at Etzel achieved as planned.

Approximately 90 tonnes, or 1 million standard cubic metres of hydrogen, have been safely injected by STORAG ETZEL and project partner Gasunie into the caverns.

The unique pilot test plant to test efficiency of hydrogen purification processes and multi-cyclic cavern operation is under-construction and will be ready for the first tests in 2026.

The H2CAST consortium aims to demonstrate the feasibility of underground hydrogen storage.