The alarm came in to the emergency services at lunchtime.
There is a fully developed fire in the engine room, 50 metres up, Jonas Penton, duty officer at the rescue service, told Aftonbladet.
Video footage published by the newspaper Corren shows parts of the wind turbine falling to the ground. According to the emergency services, rotor blades came loose and a ground fire broke out afterwards.
There are approximately 5,500 wind turbines in Sweden and this type of failure is unusual, notes Anders Wickström, research leader at the state research institute Rise and one of Sweden's leading experts on wind turbines. Only a few similar fires in wind turbines have occurred in Sweden in the last 15 years.
Wickström cannot comment on the cause of the current fire. However, in general, fires in wind turbines can be caused by electrical faults in the high-voltage equipment.
It could be a flashover, a short circuit or something like that. Bad electrical connections somewhere that cause heat to build up in an electrical cabinet up there.
One aspect could be the ongoing heat wave.
There are fans to cool the machine housing up there to remove the heat, but if it's really hot outside it's hard on the cooling system. So it might be related to running the cooling system harder than usual.
