News Release from EnBW Energie Baden-Württemberg AG


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EnBW - aerodyn research project: Floating wind turbine “Nezzy²” passes its second test in the Baltic Sea

Floating wind turbine Nezzy² successfully passed its two-month test in the Bay of Greifswald. The 18-metre-tall prototype built on a 1:10 scale consists of two wind turbines on a floating platform and is being tested jointly by the north German company aerondyn engineering and EnBW.

Image: EnBW / Fotograf Jan Oelker)Image: EnBW / Fotograf Jan Oelker)

In the Bay of Greifswald, 180 sensors were used in 30 different measurements to establish how Nezzy² behaves when exposed to different wind directions and speeds as well as wave heights and directions. Nezzy² even withstood a storm tide in mid-October. Scaled up to the later true size of Nezzy², the wave and wind conditions were equivalent to a category four to five hurricane with waves reaching heights of up to 30 metres. “For one and a half days, we were able to observe how Nezzy² remained stable in the water in extreme weather conditions. Our tests have shown that our model is now ready to be tested in the sea on a full-size scale,” says aerodyn managing director Sönke Siegfriedsen. Prior to the test in the Baltic Sea, Nezzy² was tested in a flooded gravel pit in Bremerhaven.

Until now, offshore wind turbines have been anchored to the seabed with solid foundations at a maximum water depth of 50 metres. With floating wind turbines, new countries and sea regions at greater depths can now be considered. “We want to use the floating wind turbines ourselves for our international offshore projects. That is why we are really delighted that this technology can now be further developed with our support,” explains Hannah König, head of wind and maritime technology at EnBW.

The 1:10 scale model has now been dismantled. Over the coming weeks, the recorded data will be evaluated. The findings will then be incorporated in the design of the 1:1 scale model, which is set to be tested in China at the end of 2021 or start of 2022.

Press Office
EnBW, aerodyn, Nezzy², Baltic Sea, prototype, testing, floating, Greifswald, Germany, bay, turbine

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