The video below shows the most spectacular video of a windmill failure I’ve ever seen. There aren’t a lot of details on the intertubes but I have found a couple of articles from Danish newspapers one in English and the other not. The windmill was a ten year old Vestas windmill located in Aarhus Denmark. Piecing together blog comments, the articles and, my own knowledge, this is what appears to have happened. A large storm came through the area, the central monitoring station detected that the main and backup safety braking systems had failed in this particular unit. They sent a crew to make sure the area was secure and to observe the failing windmill, after a few hours the result is shown in the video. While this was clearly a dangerous situation, the fact that the operators had ample warning to get there to observe the failure clearly shows that these types of problems should not be a cause for panic by the public. In general windmill’s are a safe and effective method of generating power, the failures usually have only economic consequences for the owners.