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In page Suction caisson:

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Suction buckets were tested with offshore wind turbines at Frederikshavn in 2002, at Horns Rev in 2008[2][3] and Borkum Riffgrund in 2014, and are to be used in a third of the foundations at the initial development at Hornsea Wind Farm.[4] Statoil have gone on to use the technology for windfarms.[5] They are also planned to be used for some of the wind turbines in the Hornsea Project One wind farm scheduled to be completed in 2020.[6][7] Similarly, a suction bucket contract has been awarded for the Aberdeen Bay Wind Farm.