The first large offshore wind farm in the world, consisting of 80 Vestas V80-2 MW WTs each of 5027 m2 swept area, was completed in 2002 in 6-14 m of water in the North Sea at Horns Rev, 14-20 km off the West Jutland coast of Denmark. The project was managed by the West Danish utility Elsam, now DONG Energy, and the wind farm is connected via an offshore substation using 30 kV AC collector cables and to shore from the substation via a 150 kV AC export cable. Maintenance of the wind farm was conceived on the basis of using helicopters access to individual WT nacelles via specially designed access platforms built onto the nacelles to accommodate drops and lifts from the Eurocopter EC135.
Effect of reliability on offshore availability, Page 1 of 2
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