Following two years of close collaboration, DNV — a leading international certification body in the offshore wind sector — has issued a Declaration of Conformity for the OO-STAR semi-submersible concrete floating structure, developed by Bouygues Travaux Publics, a subsidiary of Bouygues Construction. This certification, known as the Basic Design Certificate, confirms compliance with rigorous technical standards and represents a major milestone toward the commercialization of the OO-STAR concept.
After receiving the Approval in Principle (AiP) in September 2024, the OO-STAR platform has now become one of the first concrete-based floating structures to secure this level of certification for turbines over 15 MW. The announcement was made during the WindEurope annual exhibition held in Copenhagen.
Designed to withstand the harsh marine and weather conditions of the North Sea, the OO-STAR floater features advanced engineering tailored for high-capacity turbines. The project leverages Bouygues Travaux Publics’ full EPCI (Engineering, Procurement, Construction, and Installation) expertise, ensuring technical excellence across every phase of development.
Certification Highlights:
- Hydrodynamic Validation: Three separate tank testing campaigns confirmed the OO-STAR floater’s stability and hydrodynamic behavior under real-world conditions.
- Independent Verification: DNV independently validated the engineering methods and processes used in the structure’s design.
- Technical Rigor: The certification process aligns with the newly updated DNV-SE-0422 standard for floating wind structures, enhancing design reliability ahead of TRL 8 certification — the final stage before full-scale commercial deployment.
We would like to thank DNV for its support and valuable collaboration with our technical experts during these two years of intensive work. For Bouygues Travaux Publics, undergoing rigorous audit and certification processes is a way to provide our customers with a robust and efficient concept.
Bertrand Burtschell, CEO, Bouygues Travaux Publics
As part of its roadmap, Bouygues Travaux Publics will continue refining the OO-STAR design to reach TRL 8 and is also pursuing additional patents to enhance the robustness and scalability of the solution.
A Concrete Step Toward a Greener Future
OO-STAR offers significant sustainability benefits. The structure is designed for durability, low maintenance, and potential full reuse at the end of its life cycle. By relying on local materials and labor, it also minimizes transportation emissions and supports regional economies. With its strong performance characteristics and carbon-reducing capabilities, OO-STAR is positioned as a key enabler in the global transition to offshore renewable energy.
