Hydrogen storage: What to track
Proving caverns can cycle, and hydrogen demand to fill them
What this tab covers The attributes worth tracking regularly, with the latest value, the direction of travel and why each matters.Watch whether cavern cycling is proven at scale, how storage costs fall, and whether hydrogen demand grows enough to fill stores.
| Category | Attribute | Latest | Trend | Why it matters |
|---|---|---|---|---|
| Techno-economic | LCOS trajectory | EUR 0.66-1.75/kg discharged for salt caverns (EWI, 2024)4 | → stable | Sets whether seasonal hydrogen storage is affordable relative to production costs of EUR 3-4/kg. |
| Technical | Store integrity and hydrogen purity (in place of state of health) | Salt caverns proven for static storage; depleted fields at pilot stage (RAG Austria, HyChico Argentina)6 | ↗ improving | Leakage, microbial loss and contamination determine whether cheaper porous storage can be used. |
| Supply chain | Geological and material concentration | About 39.5 of 50 TWh European salt cavern potential in Germany5 | → stable | Storage benefits cluster where salt exists; tanks depend on carbon fibre supply. |
| Market | Utilisation and market saturation | Low utilisation can raise cost to EUR 3.50/kg4 | ↕ volatile | Revenue depends on how often a store is filled and emptied, which depends on hydrogen market build-out. |
| Compliance | Safety and environmental compliance | NFPA 2 (US, 2026 edition, scope includes hydrogen storage); Seveso III thresholds 5 t and 50 t of hydrogen (EU)1215 | → stable | Permitting for large stores near population and industry. |
| Technical | Vehicle tank cost versus DOE target | USD 12.7/kWh (2023 status, published 2025) vs USD 9/kWh 2025 target, not yet met2 | → stable | Indicates cost of distributed compressed storage for mobility and small sites. |
| Technical | Liquefaction energy | 10-13 kWh/kg today; about 8 kWh/kg projected for large plants1 | ↗ improving | Liquefaction losses decide whether liquid hydrogen is viable for shipping and large storage. |
| Impact | Lifecycle carbon payback period | No robust published figure found4 | → stable | Depends mainly on the carbon intensity of the hydrogen stored, not the store. |
Sources
- DOE Hydrogen Program Record 9013: Energy requirements for hydrogen gas compression and liquefaction US Department of Energy, 2009
- DOE Hydrogen Program Record 24006: Onboard Type IV compressed hydrogen storage system cost and performance status US Department of Energy, 2025
- Analysis of costs for underground hydrogen storage in salt caverns (Klaas, Schlund, Kopp, Vey) EWI, University of Cologne, 2024
- H2 storage needs to exceed existing gas storage: GIE (reporting Gas Infrastructure Europe study) Argus Media, 2021
- Underground hydrogen storage: application of resource management (UNECE Resource Management Week) IEA Hydrogen Technology Collaboration Programme, 2021
- Directive 2012/18/EU (Seveso III), Annex I legislation.gov.uk (EU directive text as adopted), 2012
- NFPA 2-2026: Hydrogen Technologies Code (catalogue listing) ANSI Webstore / NFPA, 2026