Our hydrogen projects

Some examples of projects.


In the region of Auvergne Rhône Alpes, Storengy and its partners (Axelera, Armines-Ecole polytechnique, Element Energy, ESK, Ineris, Inovyn, Equinor, Brouard Consulting) develop the first demonstrator of large-scale green hydrogen storage.

This project is going to use a salt cavern of the Storengy storage site in Etrez to connect electrolysis production to industrial and mobility applications.

The salt cavern used has a storage capacity of  44 tons of hydrogen, which is the equivalent of 1760 hydrogen bus tanks.

HyPSTER is located in a particularly dynamic territory regarding the development of green hydrogen usages with large-scale projects such as Zero Emission Valley (Project ZEV) in the region of Auvergne-Rhône-Alpes, the construction of hydrogen production units and filling stations in the region of Bourgogne Franche Comté. Its geographical location is also an asset for industries which are present in the Chemical Valley.

This project has received funding from the Fuel Cells and Hydrogen 2 Joint Undertaking (now Clean Hydrogen Partnership) under Grant Agreement No 101006751. This Joint Undertaking receives support from the European Union’s Horizon 2020 Research and Innovation programme, Hydrogen Europe and Hydrogen Europe Research.


*FrHyGE : France-Hydrogen-Germany (Full qualification in France of large-scale Hydrogen underground storage and replication from Germany to all European countries)

Bringing together 17 partners and coordinated by Storengy, the FrHyGe project is supported and funded by the European Union via the Clean Hydrogen Partnership.

The project aims to validate the underground storage of hydrogen in salt caverns on an industrial scale. It will set up a demonstrator at the Manosque underground storage site and study the replicability of this technology at the Harsefeld site in Germany and more widely across Europe.

The FrHyGe project has 4 objectives:

  • Converting a natural gas (or brine) salt cavern for hydrogen storage
  • Demonstrating the feasibility of injection and withdraw 100 tonnes of hydrogen over cycles ranging from 1 hour to 1 week in the converted caverns at the Manosque site
  • Studying the market penetration, the value chain and preparing for replication at other sites in France, Germany, and across Europe
  • Assessing the environmental impact, safety, and regulations in preparation for deployment on the GeoH2 (Manosque) and SaltHy (Harsefeld) projects

Storengy and its partners will carry out technical, economic, regulatory, environmental, and safety studies. They will establish a roadmap to deploy the process of conversion and creation of storage caverns as quickly as possible and thus contribute to the creation of a true European hydrogen storage and transport backbone.

Next, in the commercial operation phase, the two caverns in Manosque (GeoH2 project) will allow the storage of 6,000 tonnes of hydrogen. In Harsefeld a storage capacity of 5,200 tonnes is planned.

Hydrogen storage project at Manosque

The Géométhane storage site at Manosque, operated by Storengy, has 9 salt caverns, including 7 natural gas caverns. The total geometric volume of caverns in service is 2.7 Mm3, compared with the 6 Mm3 authorised by the concession. In addition to the 7 caverns in operation, there are two caverns available that are technically and administratively suitable for storing hydrogen.

The issues of security of supply for industry and compatibility with European directives on the development of renewable energies (RED II, and soon RED III) highlight the urgent need for massive storage (several thousand tonnes) for the Fos-Marseille carbon-free hydrogen consumption basin.

The Manosque salt caverns represent a strategic asset in this respect since they will enable around 6,000 tonnes of hydrogen to be stored. It is also possible to continue leaching existing caverns to increase capacity and create new caverns to meet changing needs.

Storage in salt caverns offers great flexibility and can respond very quickly to any demand. The quantity of gas contained in the pipeline between Manosque and the Marseille - Fos-sur-Mer Basin provides additional flexibility. Switching from injection to withdrawal mode or vice versa can be done in a short space of time, and injection and withdrawal flow rates can be very high.

Salt caverns provide security of supply, make it possible to adjust hydrogen production and consumption curves, manage the intermittent nature of renewable energies and provide tools for flexibility and optimisation of electricity grids.


SaltHy (Storage Alignment with Load and Transport of Hydrogen) is a lighthouse project in northern Germany on an industrial scale, in which green hydrogen regionally produced from wind turbines and photovoltaic systems is set to be stored in underground salt caverns at the Harsefeld gas storage facility. For this purpose, one or two new caverns will be added to the storage facility. From 2030 onwards, approximately 30 to 100 million standard cubic metres of pure hydrogen will be stored in these caverns. A feasibility study is currently being prepared for this project.

The goal is to make this green hydrogen available to local customers from industry and the mobility sectors.

Gasunie’s supra-regional pipeline network ("HyPerLink") and the "Hamburg Green Hydrogen Hub"’s distribution network can use this storage facility to compensate for the effects of fluctuations in production and consumption in their networks. This will promote the development of a green hydrogen economy in northern Germany and the creation of a European “H2 backbone”.


The first innovative Power-to-Gas demonstrator coupled with agricultural methanisation.

The process combines the use of a 250 KW electrolyser and an agricultural methanisation unit.

MéthyCentre's objective is to demonstrate the technological and economic feasibility of the process, which makes it possible to obtain three decarbonized gases:

  • renewable hydrogen
  • biomethane
  • synthetic methane

Since 2023, MéthyCentre produces 50 m³/h of green gas and 50 kg of hydrogen per day.

90% of the hydrogen produced will be used to produce synthetic methane for injection into the GRDF distribution network for traditional residential and industrial uses. The remaining 10% of the hydrogen will be used for green mobility and to power the mobility terminal installed on the site.

During 2 years, the pilot will follow an experimentation program to test the intermittent operation and measure the performance of the technological bricks.

This project is supported by the France 2030 Investment Programme operated by ADEME, the Centre-Val de Loire Region via its ERDF funds and co-constructed with our partners: CEA, Elogen, Khimod, Prodeval, La Sablière and the Syndicat intercommunal d'énergie d'Indre-et-Loire (SIEIL).