Enercon is installing the foundation for a 4.5 MW turbine at a site 500 metres offshore at Hooksiel near Wilhelmshaven. In the last week of March, the so-called bucket foundation is to be anchored to the seabed. The tower, which measures 7.5 metres across its base, is being transported directly to the site from the Enercon steel tower works in Malmö, Sweden, in four sections on a floating pontoon measuring 140 by 35 metres. In mid-April the nacelle, weighing 440 tonnes, will be installed along with the 53 metre long blades. Commissioning is due at the end of this month. Unlike the 4.5 MW machine installed last year in the Ems estuary, the turbine at Hooksiel will only be accessible by boat, using a landing stage supplied by local company Fassmer. The turbine will also test a new type of cooling system in the nacelle, developed to take account of offshore weather conditions. The turbine at Hooksiel, the Aurich-based company's sixth prototype 4.5 MW, is expected to generate around 15 GWh annually.
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Senior Renewable Energy Analyst (WindGEMINI Product Lead) DNV GL Bristol (City Centre), City of Bristol