The companies behind the TetraSpar floating offshore wind foundation have taken a final investment decision on a plan to test it off the Norwegian coast. Testing will begin in 2020.
Shell has increased its share in the project from 33% to 66%. innogy retains 33% in the newly-founded project company that will test the foundation, and Stiesdal Offshore Technologies (SOT) is contributing to the project with its modular TetraSpar concept and holds the remaining 1% of shares.
As technology partner, Siemens Gamesa Renewable Energy will provide the wind turbine and required services. The partners will be part of a project team that will gain detailed, practical insights into the construction, installation and operation of the TetraSpar concept as well as detailed performance data.
Shell project manager James Cotter said, “Shell is working to grow our renewable power business and sees great promise in floating wind technologies that could change the face of the offshore wind industry over the next decade. We want to help accelerate this change by sharing our offshore expertise with our partners in order to progress innovative solutions such as TetraSpar.”
SOT chief executive Henrik Stiesdal said, “Reaching the final investment decision on the deployment and test of our first full-scale demonstration project is a very important milestone for us.
“We have already benefited greatly from the dialogue with Shell, innogy and Siemens Gamesa Renewable Energy during the project planning, and we look forward to further enhancing the dialogue during the project execution. The benefits of our partners’ experience combined with the competences of our manufacturing partner Welcon will put us on the fast-track for rapid commercialisation.”
Dynamic stability tests on a true-to-scale model have been running since December 2018, using the wave/wind channel at the University of Maine and the wave tank at Force in Lyngby, Denmark.
This year, components for the floating prototype will be manufactured by Welcon in Give, Denmark. The components will be transported to the Port of Grenaa to be assembled.
Following the foundation's launch, the wind turbine will be mounted on the foundation at the quayside using a land-based crane.
From there, the foundation structure including the turbine will be towed to the test site in the northern part of the North Sea, moored to the seabed with three anchor lines and connected to the electrical grid.
The prototype TetraSpar will be installed approximately 10 km from shore in water depths of 200 m at the test site of the Marine Energy Test Centre near Stavanger in Norway.
The demonstration project will use a 3.6-MW Siemens Gamesa direct drive offshore wind turbine.