One month ago Enercon's owner, Aloys Wobben, said the problem was limited to a sub standard batch of five kingpins, a cast iron component supplied by a Spanish foundry. Wobben said a retrofit was to be carried out on the five turbines on which these kingpins were installed. He indicated these were the only machines on which the retrofit was needed. Since then, a series of wind plant operators in Germany have reported retrofits being carried out on their turbines, while the fix has been completed on 23 turbines in Austria.
The retrofit takes about half a day per machine and the cost is covered by Enercon, according to both Enercon's Austrian agent, Fritz Herzog, and German wind plant operators, among them Winkra Project of Hannover.