RWE and TotalEnergies to collaborate with ARC marine on nature-inclusive Reef cubes at OranjeWind wind farm.
RWE and TotalEnergies have signed an agreement with ARC marine for the supply of 66 innovative Reef cubes at a section of the future offshore wind farm OranjeWind, in the Dutch North Sea.
Installation of the foundations of OranjeWind will start in 2026. Once the construction of the offshore wind farm is completed, the 66 Reef cubes will be placed at 11 turbine foundations. This will be one of the biggest deployments of artificial reef structures at a wind farm in the North Sea to date. With this nature-inclusive project, the companies aim to further enhance the provision of habitats for marine life and research local biodiversity.
In total, 66 Reef cubes will be deployed creating 1,440 m² of surface habitat. Each Reef cube weighs almost 6,000kgs, is 1.5m in height and are made of low-carbon, recycled materials that are certified safe for the marine environment. Shell materials will be included in the mix to promote native oyster settlement and long-term habitat formation. The cuboid design of the cubes is proven for stability, efficient transport and ease of deployment. They will remain in place for the full operational lifetime of OranjeWind.
The Reef cubes contain cavities and textures which are expected to make them an attractive habitat for marine flora and fauna. Earlier research by ARC marine in the North Sea has shown that a wide range of species lived in and directly around the Reef cubes during trials. The expectation is that similar results will be delivered at the OranjeWind wind farm. Cod and native oysters have been selected as focal species because they create wider ecological benefits. By providing the habitat and shelter they require, the project is expected to support a much broader community of marine life across the ecosystem.
Tobias Keitel, chief technology officer at RWE Offshore, said: “We are proud that the OranjeWind project can make a contribution to biodiversity in the North Sea through the deployment of ARC marine’s Reef cubes. This is fully aligned with RWE’s commitment to making a positive contribution to biodiversity with our projects and assets.”
Jean Gavalda, director of offshore wind construction at TotalEnergies, said: “Together with our partner RWE and in alignment with the Dutch regulator’s guidance, OranjeWind is deploying ARC marine’s Reef cubes. This initiative demonstrates our commitment to combining renewable energy development with marine biodiversity protection, creating new habitats for North Sea wildlife.”
Tom Birbeck, CEO of ARC marine, said: “RWE and TotalEnergies placing this order with ARC marine marks the transition from pilot to full commercial delivery. It shows that leading developers are now implementing nature-inclusive design (NID) at scale, not just testing it. OranjeWind proves that biodiversity enhancement can fit seamlessly within standard offshore construction, providing measurable ecological value alongside asset protection. Our mission has always been to make NID practical, scalable and measurable and seeing it delivered here is a major step forward for the industry.”
OranjeWind offshore wind farm is a joint venture project by RWE and TotalEnergies. The 795 MW wind farm will be located 53km from the Dutch coast. Offshore construction is scheduled to start in 2026 and the wind farm is planned to be fully operational early in 2028. It will provide electricity for the equivalent of one million Dutch households annually.
