Wind Turbine Measurements in Sweden

In Sweden, there are many wind turbines that have been placed too close to dwellings and creating a very noticeable low frequency disturbance, often above the legal limits. However, the wind turbine companies are allowed to continue their exceedance of legal limits since the authorities does not allow any external person making measurements, not even international specialists on measurement technology. In a pilot project, noise levels much above the legal limit of 40 dBA were documented over weeks of measurements for a lonely house on the country side. However, in a high court decision (MMÖD, Supreme Court), it was decided that it is not possible to measure low frequency sound from wind turbines when there is wind, since wind noise will contaminate the measurement and it is therefore not possible to know what the real dBA value is. Hence, it is only predictions via simulations that can be used, and these can only be handled by the wind turbine company's experts. They always arrive at 39.5 or 39.8 dB. Knowledge in regard to measurements in windy conditions seems to be lacking. This will be covered and discussed, and data will be presented, plus comments from authorities and their experts and discussions in regard to why the authorities claim that the performed measurements cannot be used as evidence and proof that sound levels exceed the legal limits.