AGL says it has fixed Hallett turbine noise

Wind developer AGL says it has fixed tonality problems with noise from its Hallett 2 wind farm in the mid-north of South Australia.
In December 2010, AGL identified that under certain wind conditions tones from the Hallett 2 wind turbines were audible at the nearest residence. We promptly voluntarily shut down a number of wind turbines in proximity to the residence.
AGL has been working with the turbine supplier to rectify this issue and also with the neighbouring resident to coordinate access for testing.  Implementation of a permanent acoustic treatment for the turbines commenced late last year before the wind farm resumed normal operation and a specialist independent noise consultant was engaged to assess performance of the fix.
AGL General Manager Power Development Scott Thomas said: “We are pleased to advise that the tonality issue at the Hallett Hill wind farm has been fixed, with recent testing showing that there are no audible tones from the wind turbines at the closest residence at all wind speeds.”
Noise issues at Hallett have prevented the further development of the project, with opponents of Stage 3 having the development referred to court arbitration in Adelaide after the SA Supreme Court agreed that some noise emissions from Stage 2 were unacceptable.