Contributing to the production of low-carbon and more sustainable energy

  • Un site de construction industriel avec de nombreuses structures coniques et grues en cours d'édification, parfaitement reflété dans l'eau sous un ciel de crépuscule aux dégradés de violet, rose et orange.

    Recognised maritime expertise

    With 35 years of experience in civil engineering and maritime projects, we successfully tackle all offshore challenges.

  • Un grand bateau grue orange positionne une massive fondation de turbine éolienne conique jaune et grise, marquée F07, au-dessus de la mer d'un bleu profond sous un ciel clair.

    A key player in renewable energy

    We are supporting the rise of offshore wind with integrated solutions combining design, construction and installation.

Our expertise

  • Un chantier de construction montre de grands piliers de béton gris inachevés, surmontés d'échafaudages et de coffrages, sous un ciel bleu clair avec plusieurs grues jaunes actives et un plan d'eau en arrière-plan.

    Project-specific engineering and design

    From the very start we design foundations suited to maritime conditions. Hydrodynamic calculations, construction methods, port logistics and installation scenarios are integrated to control costs, schedules and environmental impact. This stage ensures continuity from the engineering to the construction phase.

  • Une allée ou tuyauterie industrielle jaune vif et brillante s'étend au premier plan, encadrant une vaste zone de construction avec d'imposantes structures coniques en béton gris et des grues sous un ciel clair.

    Structuring financial models

    As an EPCI (Engineering, Procurement, Construction, Installation) integrator, we support developers in establishing robust financing. Through our expertise in large-scale projects, we ensure the successful completion of projects – reliability and performance of the structures – which contributes to the attractiveness of offshore wind farms.

  • Vue aérienne d'un vaste chantier de construction montrant des dizaines de structures coniques en béton gris en cours d'édification, entourées de nombreuses grues à tour jaunes sous un ciel bleu clair, avec un plan d'eau et des terres verdoyantes en arrière-plan.

    Industrialisation and production

    Using prestressed concrete and lean management principles, we industrialise the construction of foundations.

    We also perform heavy lifting for the installation of the major structural components. At Fécamp, in France, 71 gravity-based foundations were produced on four parallel lines and delivered in 21 months. In our model, the construction phase is directly linked to upstream engineering and to installation operations.

  • Grand navire-grue Sleipnir, rouge et noir, soulevant un composant de fondation d'éolienne conique gris et jaune en mer, à côté d'une barge transportant deux structures similaires sous un ciel bleu clair.

    Safe and precise offshore installation

    We handle the transport and placement of foundations at sea. Our marine assets and expertise ensure gravity-based and floating structures are installed safely, accurately and on schedule. This final stage demonstrates the end-to-end role we play in projects, linking design, financial engineering and construction through to commissioning.

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Gravity‑based foundations, a proven solution

Our gravity‑based structure (GBS) foundations sit on a hollow prestressed concrete base laid on the seabed over a gravel bed and filled with ballast. These foundations eliminate the need for offshore driving or drilling of large‑diameter piles, avoiding underwater noise and the additional costs associated with complex geotechnical conditions. With lifespans that can exceed 100 years and minimal maintenance requirements, GBS deliver optimal performance for turbines from 7 MW up to 20 MW and beyond.

Our flagship project in Fécamp, France, illustrates our expertise: 71 foundations of 5,000 tonnes each were produced on four parallel production lines and delivered just 21 months after construction began, with a peak workforce of 1,000 people.

This industrial approach optimises design, methods and transport simultaneously, for GBS designed to the highest standards of precision.

Vaste chantier montrant de nombreuses fondations coniques en béton gris en cours de construction, certaines avec des sommets jaunes vifs, et plusieurs grandes grues jaunes sous un ciel bleu dégagé.

Floating foundations are the offshore solution of the future

For deep waters beyond 60 to 70 metres, our OO‑STAR floating foundations offer a solution for the future. This semi‑submersible technology consists of a platform with three satellite pontoons arranged around the central floater that supports the wind turbine. It allows the capture of stronger, more constant winds with higher‑capacity turbines, which contributes to optimising investment costs.

Resulting from 15 years of research and development by Dr Olav Olsen, the OO‑STAR ensures optimal turbine performance even in the harshest weather conditions. Designed for modular construction, this floater can be assembled either at quay or offshore with a moderate draught.

Our commitment to sustainable development includes the use of low‑carbon concrete and steel. We are also exploring synergies with hydrogen production and storage within the floaters.

Illustration en coupe d'une éolienne offshore flottante, montrant sa plateforme grise en surface, ses pales blanches à bouts rouges, et son système d'ancrage sous-marin avec câbles rouges et blancs sur le fond marin. Deux autres éoliennes et un navire sont visibles au loin sur l'océan bleu.
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