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Tetrasparinnogy, Shell and Stiesdal Offshore Technologies (SOT) have signed an investment and cooperation agreement committing the partners to build a demonstration project using SOT’s ‘TetraSpar’ floating foundation concept. Its modular layout consists of a tubular steel main structure with a suspended keel.
 
The project has a budget of approximately €18 million. The demonstration project will use a 3.6MW Siemens Gamesa Renewable Energy (SGRE) direct drive offshore wind turbine and is due to be deployed in 2019. It will be located approximately 10km from shore in water depths of 200m at the test site of the Marine Energy Test Centre (Metcentre) near Stavanger in Norway. The foundation will be manufactured and assembled in Denmark and the turbine will be installed in the port of Grenaa, from where it will be towed to site. At site the floating structure will be moored to the seabed with three anchor lines and connected to the electrical grid. The partners will set up a company with a 33 percent share each for innogy and Shell, with the rest held by SOT and its parent company. SGRE is contributing to the project as a technology partner and will provide the wind turbine and required services.
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