Engineering company for underground storage solutions for energy, hydrocarbons and CO2.
Geostock
Rueil-Malmaison (FR) · HeadquartersNew on Amplifa
About Geostock
Geostock is an international engineering company based in Rueil-Malmaison (France) specialising in the underground storage of energy. The company covers the entire value chain: from consulting through feasibility studies and detailed design (engineering) to construction supervision including turnkey construction, HSE management and training of operator teams, as well as the operation, management and maintenance of storage facilities. Its activities include the storage of hydrocarbons, decarbonised energies (including power-to-gas) and CO2 (CCS). With 290 engineers and technicians, Geostock is active in 29 countries and operates four storage facilities. The Green Storage programme consolidates its activities in sustainability, CO2 reduction and the storage of decarbonised energies. In 2025, the company celebrated its 60th anniversary.
- Site
- Rueil-Malmaison, France
- Processes
- Consulting on underground storage solutions (conseil stockage souterrain), Engineering for underground energy storage (feasibility studies to detailed design), Construction supervision/site management for underground storage infrastructure (contractor, Operation, management and maintenance of underground storage facilities, Storage of hydrocarbons (hydrocarbures), Storage of decarbonised energies, CO2 storage (underground), Consulting on underground storage
- Materials
- Engineering of underground storage, Construction supervision/site management, Operation and maintenance
- Certificates
- HSE management
- Founded
- 1965
- Employees
- 290
- Industries
- Energy storage, Oil and gas industry (hydrocarbon storage), CO2 storage (CCS), Renewable energies/power-to-gas
- 01
Consulting on underground storage solutions
- 02
Engineering: from feasibility study to detailed design
- 03
Construction supervision/turnkey construction incl. HSE and training
- 04
Operation, management and maintenance of the storage facilities
Services and Storage Technologies
Engineering of underground storage
Design and conception of storage infrastructure from feasibility study to turnkey implementation.
Construction supervision/site management
Management of construction execution from contractor selection to commissioning under HSE requirements.
Operation and maintenance
Technical and administrative management of storage facilities, either in support or under full delegation.
Locations
Rueil-Malmaison
FRHeadquarters
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Consulting on underground storage solutions (conseil stockage souterrain)Engineering | – | – | – | – | – |
| Engineering for underground energy storage (feasibility studies to detailed design)Engineering | – | – | – | – | – |
| Construction supervision/site management for underground storage infrastructure (contractorAssembly | – | – | – | – | – |
| Operation, management and maintenance of underground storage facilitiesAssembly | – | – | – | – | – |
| Storage of hydrocarbons (hydrocarbures)Engineering | – | – | – | – | – |
| Storage of decarbonised energiesEngineering | – | – | – | – | – |
| CO2 storage (underground)Engineering | – | – | – | – | – |
Additional services
Quality and HSE
Geostock integrates HSE requirements (safety, conformity, adherence to deadlines) into construction supervision and operation as well as into the training of operator teams; documented certifications are not available.
| Evidence | Rueil-Malmaison |
|---|---|
| HSE management |
History
- 1965
Founding of Geostock
- 2025
Geostock celebrates its 60th anniversary; four storage facilities in operation, Green Storage programme