EWE GASSPEICHER

Storing Green Hydrogen in Salt Caverns

Beneath the Surface Lies a Key to the Energy Transition

Green hydrogen is a key pillar for the success of the energy transition and the decarbonization of industry. To ensure reliable availability, high-performance storage solutions are essential. Underground salt caverns provide a safe and long-term option for storing green hydrogen and making it flexibly available for industry, mobility and electricity supply. With decades of experience in gas storage, EWE GASSPEICHER is driving the development of a secure hydrogen infrastructure. The goal: to create storage capacities that meet demand while ensuring security of supply. 

The Clean Hydrogen Coastline Program

Through the Clean Hydrogen Coastline program, EWE brings together concrete projects across the entire green hydrogen value chain - from production and storage to transport and application in industry and mobility. This accelerates the development of a comprehensive hydrogen infrastructure and actively contributes to the sustainable transformation in Germany and Europe.

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PCI

PCI status for EWE projects

In December 2025, EWE’s hydrogen storage projects in Huntorf, Jemgum and Rüdersdorf were granted PCI status and included in the second EU PCI-PMI list. PCI status highlights the projects’ strategic relevance at European level and enables benefits such as accelerated permitting, improved cross-border coordination and eligibility for CEF funding.

PCI-Projects
HyCAVmobil

Project HyCAVmobil

As part of the HyCAVmobil research project, EWE and the German Aerospace Center (DLR) have successfully demonstrated, for the first time, the safe storage of green hydrogen in an underground salt cavern. At the Rüdersdorf site near Berlin, a 500-cubic-meter test cavern was used to trial injection and withdrawal under real-world conditions.

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Storage Huntorf

Project Storage Huntorf

The Huntorf storage project is a cornerstone of the energy transition. At the Huntorf site in the Wesermarsch region, EWE is repurposing an existing salt cavern—previously used for natural gas storage—for hydrogen storage. Starting in late 2027, green hydrogen will be stored here. The facility will be connected to the German Hydrogen Core Network and the European Hydrogen Backbone.

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