Shell, innogy SE and Stiesdal Offshore Technologies A/S (SOT) have taken the final investment decision on the €18 million ‘TetraSpar’ floating foundation demonstration project. This is a next step in floating wind. The demonstration project will be tested off the Norwegian coast in 2020.
TetraSpar modular floating foundation
The TetraSpar is an innovation by SOT. The floating foundation consists of a tubular steel main structure with a suspended keel. The modular layout is reported to have the potential for leaner manufacturing, assembly and installation processes with lower material costs. Dynamic stability tests on a true-to-scale model have been running since last December, using the wave-wind channel at the University of Maine, USA, and the wave tank at FORCE in Lyngby, Denmark. This year, the components for the large floating prototype will be manufactured by Welcon A/S in Give, Denmark.
First full-scale demonstration
In 2020, the complete structure, including a SGRE 3.6 MW wind turbine, will be assembled at the Port of Grenaa in Denmark. From here, it will be towed to the test site of the Marine Energy Test Centre, approximately 10 km off the coast of Stavanger in Norway. At the site it will be moored to the seabed , at a water depth of 200 m, with three anchor lines and connected to the electrical grid.
All three companies are looking to grow their renewable energy activities and see floating wind as a potential growth market. The TetraSpar demonstration project will provide the companies with better understanding of technical insights and the costs of floating wind. Shell has increased their share in the project from 33% to 66%. innogy retains 33% in the newly founded project company and SOT holds 1% of the shares. Source: innogy