RWE Deploys Bubble Curtain Technology at Sofia Offshore Wind Farm

RWE, in partnership with Hydrotechnik Offshore, has successfully implemented underwater noise abatement technology during the installation of monopiles at the Sofia offshore wind farm. This marks the first time such technology has been utilized in the UK, showcasing a commitment to environmental protection and conservation efforts.

Located on Dogger Bank, 195 kilometers off the UK coast, the 1.4 GW Sofia project is situated within the Southern North Sea Special Area of Conservation (SAC). This protected zone for harbor porpoises necessitates strict noise disturbance regulations, making the use of the bubble curtain technology crucial for minimizing underwater noise propagation during piling operations.

The bubble curtain system, developed by Hydrotechnik Offshore, helps mitigate disturbances to marine species like harbor porpoises, dolphins, and whales, which rely on ultrasound for navigation and communication. By reducing noise levels during construction activities, the technology aids in preserving the marine ecosystem and safeguarding vulnerable species.

This innovative technology has been previously deployed on offshore wind projects, including Vattenfall’s DanTysk wind farm in Germany and EnBW’s He Dreiht offshore wind farm. Its successful implementation at these sites underscores its effectiveness in reducing underwater noise pollution and protecting marine biodiversity.

The bubble curtain system involves the placement of a perforated hose on the seabed around the installation site, forming a 180-meter-wide ring. Compressed air is then pumped through the hose, creating a continuous stream of bubbles that rise to the surface. This bubble barrier disrupts and slows down sound waves, significantly lowering noise levels during piling operations.

At the Sofia project site, monopile foundations are being installed by Van Oord using their jack-up vessel Aeolus. With more than 60 out of the 100 wind turbine foundations already in place, the project is progressing towards its completion. The first wind turbine has also been installed, showcasing significant milestones in the construction process.

Upon completion in 2026, the 1.4 GW Sofia offshore wind farm is expected to generate enough electricity to power approximately 1.2 million UK homes. This clean energy source will contribute to the country’s renewable energy goals while upholding environmental sustainability and conservation principles.