Underground Hydrogen Storage System
A Scottish company has developed an underground hydrogen storage system which is likely to see a pilot project built next year. This new H2FlexiStore system has been built by energy storage specialist company Gravitricity. It is designed to contain up to 100 tonnes of pressurised hydrogen in carefully constructed geological shafts with a strong lining to contain the gas. The pressurised hydrogen will be stored at 200 bar per shaft equivalent to 3.3GWh. The company maintains that its H2FlexiStore system can be situated in many different geological conditions while continuing to store large quantities of pressurised hydrogen. These developments are based on a successful feasibility study which was conducted during the course of 2024. The study also established that well sited nodal storage can greatly boost the efficiency of future hydrogen gas networks.