Storag Etzel

companyGermany 4 mentions

Underground gas and hydrogen storage

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Projects

Germany's largest operational underground hydrogen storage project injecting green hydrogen into two 300,000m³ salt caverns at the Etzel facility in Lower Saxony. The pilot phase began in Q2 2025 with an initial 90-tonne injection using a 2% hydrogen blend in existing pipelines.

operational 2 mentions

Pilot to demonstrate underground hydrogen storage in salt caverns, testing purification and multi-cyclic operation

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Facilities

Etzel salt caverns

Etzel Salt Cavern Storage Site

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Often mentioned with · Technologies

Hydrogen Underground Salt Cavern Storage

Conversion of existing natural gas caverns for hydrogen storage with above-ground purification plant

Hydrogen storage in salt caverns

Utilizing underground salt caverns to store large quantities of hydrogen safely, efficiently, and reliably for extended periods.

Underground salt-cavern hydrogen storage

A method of storing hydrogen in large underground caverns created in salt formations. Salt is chemically inert to hydrogen, impermeable to fluids, and geologically stable, making it ideal for long-term hydrogen storage.

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Often mentioned with · Locations

East Frisia, Lower Saxony (Etzel near Wilhelmshaven)

East Frisia, Lower Saxony (Etzel near Wilhelmshaven)

Often mentioned with · Projects

Germany's largest operational underground hydrogen storage project injecting green hydrogen into two 300,000m³ salt caverns at the Etzel facility in Lower Saxony. The pilot phase began in Q2 2025 with an initial 90-tonne injection using a 2% hydrogen blend in existing pipelines.

operational 2 mentions

Pilot to demonstrate underground hydrogen storage in salt caverns, testing purification and multi-cyclic operation

Often mentioned with · Facilities

Etzel Salt Cavern Storage Site

Werlte electrolyzer plant

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Often mentioned with · Research studies

H2CAST Etzel Pilot Testing

In the news (4)

Hydrogen Storage Pilot at Etzel Completes 90 Tonnes Underground Filling

3 months 2 days ago

Operating caverns at Etzel since 1971, leading partner in H2CAST project for converting salt caverns to hydrogen storage, recently completed filling two caverns with 90 tonnes of hydrogen[1][2][7]

Green Hydrogen Storage Steps Up: Plug Power Delivers 44.5 Tons to Germany’s H2CAST Cavern

8 months 10 days ago

STORAG ETZEL operates salt caverns in Germany for the storage of energy resources. In the H2CAST project, they participate in the conversion of these caverns for large-scale hydrogen storage, expanding their activities from natural gas to renewable hydrogen in line with Germany’s energy transition strategy.[1]

Germany Begins First Hydrogen Salt Cavern Storage Project to Unlock Scalable Green Hydrogen

1 year 1 month ago

German operator of the Etzel salt cavern storage facility. Storag Etzel is the primary operator managing the H2CAST project and the injection of green hydrogen into salt caverns.

Multi-cavity hydrogen storage facility plans unveiled in Germany

2 years 4 months ago

The largest independent provider of underground energy storage for natural gas and crude oil in Germany, partnering with Gasunie on hydrogen storage in salt caverns.

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