Story 4
Full speed into tomorrow
EPISODE 5
Ensuring a buoyant future for offshore wind

DCNS is one of the leading player in the field of floating offshore wind farms. Our expertise dates to 2008 and takes advantage of long history in naval architecture and construction.

Our first foray into floating wind farms dates back to 2008 and the WinFlo research program. It was followed in 2014 by Sea Reed, a R&D project between DCNS and Alstom Renewable Power (later GE Energy) that laid the foundations for our current participation in the Ile de Groix wind turbine pilot project in the south of Britany. DCNS and French construction firm Vinci will provide the floating platform while General Electric will supply the turbines.

Over the course of these projects, we have refined an innovative, production-ready platform design. Discover how it adapts to the environmental and economic parameters of any floating offshore wind farm project.

Floating wind turbines by DCNS

Balancing act

Capable of withstanding punishing offshore conditions, the DCNS hybrid floater is designed to provide a highly stable platform for a 400-tonne wind turbine measuring over 100 meters high. The floater’s architecture, comprised of three stabilizing columns at each vertex connected by three pontoons, is inspired by DCNS’s experience in building submarines and aircraft carriers.

 

Semi-submersible design

The platform is between 65 and 75 meters wide and has an unballasted draft of just five meters, which means that assembly and maintenance of the entire wind turbine can be done in port. The passive ballasts are filled with seawater to ensure maximum stability.

 

Hybrid structure

The DCNS floater design mixes concrete and steel to provide the most competitive and efficient solution. Concrete is used for the structural components most exposed to stress and wear, especially in the conditions found along the Atlantic coast, while naval grade steel is used in the floating parts of the platform.

 

Cost effective assembly

They hybrid structure can be manufactured in most ports, as long as locally sourced concrete and steel are readily available. This contributes to local economic activity and employment in the region around the port. Based on DCNS’ experience in naval construction, the fabrication methods have been streamlined and industrialized for maximum cost efficiency.

 

Time saving installation

Once the platform is built and partially submerged quayside, the wind turbine is installed directly on the platform and then the whole structure is towed upright onto site and attached to the mooring. To save time, the mooring system is installed while the platform is being built. This approach eliminates the need for expensive and lengthy offshore campaigns, which are often subject to delays due to weather, which further helps to improve the competitiveness of the DCNS semi-submersible platform.

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