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AM indicates aerodynamic noise from wind turbines that is greater than the normal degree of regular fluctuation of blade swoosh. It is sometimes described as sounding like a distant train or distant piling operation.

The Government commissioned work assessed 133 operational wind projects across Britain and found that although the occurrence of AM cannot be fully predicted, the incidence of it from operational turbines is low.

Commentating on wind farm worries, Energy Minister Malcolm Wicks said:

?Where there are legitimate problems we will address them. But it is essential that we produce more wind power if we are to meet our climate change and security of supply aims.?

Out of all the working wind farms at the time of the study, there were four cases where AM appeared to be a factor. Complaints have subsided for three out of these four sites, in one case as a result of remedial treatment in the form of a wind turbine control system. In the remaining case, which is a recent installation, investigations are ongoing.

Based on these findings, the Government does not consider there to be a compelling case for more work into aerodynamic modulation and is not planning to carry out any further research.