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GEOSTOCK is an international engineering group with over 50 years of experience and know-how in specialised services relating to design, construction and operation of underground storage facilities for liquid, liquefied and gaseous hydrocarbons but also compressed air, hydrogen or CO2. GEOSTOCK is owned by Entrepose (Vinci Group) (90 %) and Total (10 %)and comprises a number of subsidiaries worldwide (France, Germany, United States, Mexico, Singapore, Brazil). The combined knowledge and expertise of its companies enable the GEOSTOCK Group to offer its services all around the world (consultancy and design, construction management, management and operation-maintenance) on all types of underground storage facilities for a full range of products. Underground storage techniques involved are mainly: &bull, Mined rock caverns (including use of abandoned mines), &bull, Porous media (depleted oil or gas fields or aquifers), &bull, Leached salt caverns, &bull, Lined rock caverns.