After more than six months' fight against the clock, Vestas switched online the last renovated turbine at the 160 MW Horns Reef offshore wind farm in mid-December. All 80 V80 nacelles were repaired on land in one of Vestas' factories to replace faulty generators and transformers (Windpower Monthly, November 2004). The costs of the retrofit program, together with production losses to utility Elsam -- Horns Reef's owner -- are guessed to be as high as DKK 100 million. Back in place off the west coast of Jutland, the turbines were ready for the windy season, which came in like a lion with a hurricane January 8. According to Elsam's Jens Bonefeld, the machines performed by the book, stalling before winds reached up to 46.4 metres per second and starting up again when the winds subsided to 15 m/s. None of the turbines were damaged during the storm. A similar hurricane hit Horns Reef in 1999 with wind speeds up to 58 m/s.
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Senior Renewable Energy Analyst (WindGEMINI Product Lead) DNV GL Bristol (City Centre), City of Bristol