The MéthyCentre project (Centre-Val de Loire region)


This project will enable the production and storage of three carbon-free gases: hydrogen, biomethane and synthetic methane from renewable electricity and agricultural waste for green mobility (Bio-NGV and hydrogen) and injection into the network. The facility will therefore combine anaerobic digestion (methanisation), green hydrogen production and methanation (also known as "Power-to-Gas").

The production of 5 kg hydrogen per day will supply local service stations, which corresponds to intensive consumption of 20 light vehicles. The renewable gas produced will meet the needs of 800 inhabitants.

The interests of the project:

  • Find a solution to the problem posed by the intermittence of renewable electricity production and battery storage.
  • Use the CO2 produced by methanisation to recover and produce gas, which considerably reduces greenhouse gases emissions (GHG).
Photo credit: Franck Dunouau

Plaine de Garonne Energies (PGE)

Deep geothermal energy - Heating network

In order to respond to the expectations of Bordeaux Métropole, Storengy and ENGIE Solutions associated to develop a unique, integrated deep geothermal energy offer, combining ENGIE Solutions experience in heat networks with Storengy’s long-standing expertise in underground exploration and development.

Bordeaux Métropole chose a player who is committed to long-term solutions regarding all dimensions of this ambitious project. Thus, we are initiating the renewal of deep geothermal energy in France.

Storengy will be involved in the construction of a 25 km heat network which will supply about 28,000 homes and save 19,000 tons of CO2 per year, the equivalent of about 12,000 cars in the area.

Our commitment to this network is going to last 30 years, thus guaranteeing stable costs for all users.

This project benefits from the European Union’s (through the European Regional Development Fund) and the ADEME's financial support.

Photo credit: ENGIE Solutions

Issy City Centre Project

Deep geothermal energy - Heating network

Coeur d'Issy is an ecodistrict project developed with low-temperature geothermal energy to meet the heating and cooling needs of local residents.

In figures:

  • 95% of energy needs met.
  • For more than 100,000 m² of offices, homes and businesses, including 627 housing units.
  • More than 5 certifications and labels such as NF-Habitat HQE, BEPOS and BiodiverCity.

Storengy, an innovative partner, is committed to the success of your project.

© Altarea Cogedim

Deep geothermal energy - Indonesia

Deep geothermal energy - Electricity

Storengy provides its expertise to ENGIE’s projects and is involved in geothermal resource exploration and development stages in Indonesia, on Sumatra island.

The Muarah Laboh station generates 85 MW of power, which is the equivalent of the energy consumption of 120,000 households.

Storengy is able to support major projects from the stage of underground exploration to the construction and operation of geothermal power generation stations.


Service provision

Today, ENGIE BiOZ has 16 anaerobic digestion sites in operation and around forty under development.

The Vermandois Biomethane Plant in Eppeville (80) in figures and in pictures:

  • 230 Nm³/h of biomethane injected continuously.
  • 20 GWh of renewable gas produced, i.e. the equivalent of the consumption of around 1,500 households per year.
  • 30,000 tonnes of substrates treated per year.
  • 31 partner agricultural operations for a total surface area of 6,000 ha.
  • 60 tonnes of chemical fertiliser avoided.
  • 4,600 tonnes of CO2 avoided per year, corresponding to the annual emissions of more than 2,300 new cars.
Photo credit: ENGIE BiOZ

“Vanguard“ green hydrogen project (UK)

Service provision

Storengy is responsible for the installation of the refuelling station, its operation and the marketing and sale of the green transport fuel certificates.

The project will see the first green station in the North West of the UK with the production of green hydrogen fuel to enable three vehicles, including two refuse trucks, to run on the technology.

The hydrogen will be produced by installing solar panels which will convert the energy via an electrolyser to produce the green fuel.

The project meets emission reduction targets, including:

  • A zero-carbon target by 2025.
  • A reduction of 30 tonnes of C02 emissions per year.
  •  A reduction in diesel use of 10,000 litres per year.

The station will eventually supply Cheshire County Council’s refuse trucks and Storengy UK vehicles.

The project has been funded by public and private funds - with a £345,000 contribution from the Local Growth Fund

Ital Gas Storage

Service provision

Conversion of a depleted gas field into an underground storage.

Since 2018, Storengy provides technical support to Ital Gas Storage’s (IGS) conversion project of a depleted gas field in Lombardy (Italy).

Ital Gas Storage is the leading independent gas storage operator in Italy.

Storengy provides technical expertise and support to IGS on:

  • Underground expertise: geophysics, geology, reservoir engineering.
  • Wells and surface facilities: drilling, commissioning procedures, QHSE, processes and control room operations, maintenance.
  • Performance characterization and forecasts: development plan and commercial product design, jointly with IGS’s technical and commercial teams.
  • Operational support: assistance and monitoring of the injection and withdrawal plans, definition of operational flow rates and pressures.
  • Digital modelling of the storage: integration of data and constraints regarding the underground storage, the wells, as well as the surface facilities, and performance simulation.
  • Modelling and geomechanical study of the storage.
  • Dedicated trainings: on underground topics (reservoir, wells) as well as on surface ones (processes, QHSE, control room operations, maintenance…).

Storengy assisted Ital Gas Storage during the commissioning and start-up of the storage site and is currently providing technical support in the operations and performance characterization of the storage, during the first years of development and commercialization.

Drilling site in Italy


Service provision

Since 2018, Storengy has been working with Conexus on various technical missions for the Incukalns gas storage:

  • Evaluation of the performance of the reservoir to improve the injection capacity of the storage.
  • Technical audit on various aspect of the gas storage activity.
  • Technical support for the installation of a new compressor.

In May 2020, Conexus published a tender to select the consultancy which will support Conexus for a 2-year comprehensive technological supervision of their reservoir performance. This service consists of the monthly monitoring of the performance of the reservoir and seasonal review of the various aspects of the injection/withdrawal campaigns: gas bubble extension, review of the previous campaign, forecast for the upcoming campaigns, recommendations to improve the performance and monitoring of the site. It also includes the update of the 3D simulation model of the reservoir used for the mid-term performance forecast.

 Within this 2-year contract, Storengy has been commissioned by Conexus to provide the following services:

  • Monthly forecast of maximum withdrawal/injection capacity.
  • Forecast of the next injection/withdrawal campaign.
  • Review and analysis of the monitoring of the previous campaign.
  • Update and maintenance of the 3D reservoir simulation model.

Périgny project (Grand Paris Sud-Est Avenir)

Shallow geothermal energy

The aim of the project is to carry out a feasibility study of Borehole Thermal Energy Storage (BTES) for the heating and cooling of the Maison de la Nature in Périgny-sur-Yerres. 

The interests of this project: 

  • This is the first contract of this type won in France by Storengy.
  • The BTES solution chosen will supply the 884 m² of the Maison de la Nature with renewable, local and non-intermittent energy.
  • The feasibility study was carried out in 2020 in order to designate the location of the test borehole.

The Campus project (Hauts de Seine)

Shallow geothermal energy

The new ENGIE headquarters will be supplied with heating and cooling by an innovative ATES-type geothermal solution.

This ATES (Aquifer Thermal Energy Storage) solution is based on the exploitation of two aquifer bubbles that will operate intermittently:

  • In winter, water will be drawn from the "hot" bubble to heat the buildings before being reinjected into the "cold" bubble.
  • In summer, water will be drawn from the "cold" bubble to cool the buildings before being reinjected into the "hot" bubble.

This is a first in France for a project of this size.

The project will provide heating and cooling using 100% renewable energy, with energy performance improved by 40% compared with the RT2012 standards.

Storengy provided the following services: design and sizing of the project, assistance with the application for a geothermal deposit search permit (permitting), construction and implementation of a turnkey project.

Key figures :

  • 136,000 m² of land, including 19,000 m² of green space.
  • A capacity of 1.9MW in heating and 1.6MW in cooling.
  • Several labels of excellence such as HQE, BREEAM, OsmoZ, BiodiverCity, WiredScore.

The Versailles Pion project

Shallow geothermal energy

The aim of the project is to create a new low-temperature geothermal solution on the water table for Agronergy in order to supply a new eco-neighbourhood of around one hundred homes in Versailles.

Storengy has already carried out the feasibility study with a test borehole at a depth of around 60 metres. The next step is expected at the end of 2021!

Renewable energy coupling project in Annecy

Shallow geothermal energy

Storengy and the City of Annecy have signed a partnership agreement to enhance geothermal energy and develop new associated concepts. 

The project deals with the improvement of the existing energy system at the ”Equipement pour l'enfance Vallin-Fier“. It combines geothermal and solar thermal energy and will serve as a demonstrator for other existing and future building programmes. 

The ”Vallin-Fier“ complex, which includes a primary school, a nursery school, a gymnasium and a day-care centre, was initially equipped with a geothermal installation consisting of 18 vertical geothermal probes and a heat pump. To optimise the performance of the installation (summer/winter alternation), the city of Annecy and Storengy worked to find a sustainable energy solution to meet heating needs.

The project involves installing thermal solar panels on the roof of the building to capture heat in the summer, which will be stored underground and then used in the winter to heat the building. This additional heat will complement the heat produced during the summer when the sensor system is used to cool the buildings. 

At the same time, two underground temperature measurement probes will be installed in the underground (approximately -130 metres) to monitor its temperature and measure the efficiency of the coupling in real time, a first in France. 

Storengy will support the City of Annecy by providing its recognised expertise in the field of geosciences and energy production engineering with a view to deploying coupled geo-energy solutions. 

The University of Savoie Mont-Blanc, which is at the forefront of solar thermal energy, will also be associated with this project, as will ADEME.

HIVE - Helsinki Decarbonisation Project

Shallow geothermal energy

HIVE is a team that brings together different partners ENGIE, its subsidiary Storengy, ENGIE LAB CRIGEN, TRACTEBEL, NEWHEAT, SAVOSOLAR, PLANENERGI and AEE INTEC.

The solution presented by the HIVE team was selected by the City of Helsinki in March 2021 as the most effective solution to decarbonise its heating network by 2035.

The solution includes :

  • Reducing the use of biomass to 50% of the needs by 2024.
  • An end to coal burning by 2028.
  • No combustion of fossil fuels beyond 2035.

In this context, Storengy will be in charge of managing major heating networks built on the BTES model (geothermal energy on probes), which is an essential part of the system planned for the Finnish capital. 

The other players in the project : 

  • ENGIE: operation of the heating and cooling network
  • ENGIE LAB CRIGEN, ENGIE IMPACT, TRACTEBEL: thermal load forecasting
  • Plan Energi: PTES solution
  • New Heat: solar energy solution
  • Savosolar: Installation of solar panels
  • AEE INTEC: management and study of natural resources

Arcueil-Gentilly in partnership with ENGIE Solutions

Deep geothermal energy - Heating network

In 2013, ENGIE Solutions won a call for tenders to design, build and operate a new heating network in the Arcueil-Gentilly municipalities in the Paris region as part of a public service delegation.  

Storengy is in charge of managing the geothermal doublet drilling operations.

Partnership with ENSEGID

Deep geothermal energy - Heating network

In January 2017, Storengy and ENSEGID signed a partnership agreement to collaborate on innovative geothermal and seasonal energy storage projects such as:

  • Aquifer Thermal Energy Storage (ATES), for which no project exists in the Nouvelle-Aquitaine region.
  • Borehole Thermal Energy Storage (BTES) on geothermal probe fields.

These local, decentralised projects, adapted to neighbourhoods undergoing renovation and new eco-neighbourhoods, will make it possible to provide innovative solutions for the storage of renewable energy, particularly heat and cold.

Village Nature in association with ENGIE Solutions

Deep geothermal energy - Heating network

Since 2015, Storengy has been associated with ENGIE Solutions and an investment fund for the design, construction, financing and operation of the geothermal heating network for the new Villages Nature park and Disneyland® Paris. The operating concession is valid for 25 years for assistance to the project owner (underground) in the context of a private investment project led by Disneyland® and Pierre & Vacances Center Parcs.

Partnership with Reykjavik Geothermal to develop geothermal projects in Mexico

Deep geothermal energy - Electricity

Storengy and Reykjavik Geothermal are cooperating on geothermal projects in Mexico to supply electricity to a growing Mexican market. They are currently working to develop a portfolio of three exploration licences in the states of Puebla and Nayarit. 

Partnership with TLS Geothermics

Deep geothermal energy - Electricity

In June 2017, Storengy and TLS Geothermics signed a partnership agreement in the field of high-temperature geothermal energy.

This agreement allows them to collaborate on R&D topics aimed at:

  • Reducing the risks and costs of the exploration phase.
  • Developing electricity production in France and Europe.

The Hycaunais project (Burgundy Franche Comté Region)


This is a territorial project for the production and storage of renewable energy. 

This Power-to-Gas demonstrator will make it possible to:

  • Transform renewable electricity from a wind farm.
  • Recover CO2 from a non-hazardous waste storage facility (ISDN) in the area.
  • Produce renewable hydrogen and e-methane.

*Power-to-Gas enables electricity from renewable energy sources to be converted into gas which is renewable as well. It involves using electricity from renewable resources (such as wind power for Hycaunais) to generate gas that can be stored. This is made possible by the combination of the two processes used: electrolysis and methanation.

The project players and their role:

  • Storengy: project leader for all the partners and integrator.
  • Electrochaea: supplier of the biological methanation technology.
  • Elogen: supplier of the electrolyser.
  • ENGIE Green: implementation of the renewable energy production software.
  • ENGIE Lab Crigen: project integrator.
  • Syndicat Départemental d'Energies de l'Yonne (SDEY): project integrator.
  • SEM Yonne Energie: project integrator.
  • University of Franche Comté (UFC): validation of the technical and economic approach of the project for its replicability. 

HyPSTER Project


In the region of Auvergne Rhône Alpes, Storengy and its partners (Axelera, Armines-Ecole polytechnique, Element Energy, ESK, Ineris, Inovyn) 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 1,760 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. 

The ZEV (Zero Emission Valley) project in the region of Auvergne Rhône Alpes comprises 20 hydrogen stations and 1,000 hydrogen vehicles by 2023. Industrial grey hydrogen applications are already existing (especially in the Chemical Valley) and decarbonising the industry and heavy mobility of this sector with green hydrogen is being taken into consideration.

This project has been granted financing by the Fuel Celles and Hydrogen Joint Undertaking (FCH 2 JU) under the subvention agreement no. 101006751. This public-private partnership has received the support of the Horizon 2020 research and innovation programme by the European Union, Hydrogen Europe and Hydrogen Europe Research.