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Wind Turbine Noise

Wind Turbine Noise


Our CV of Wind Turbine projects range from single turbine sites to multi-turbine, multi-sites. We offer expert advice for Planning, Compliance and Complaint Investigation and for monitoring durations of several weeks to many months.

For more complex investigations, we offer specialist services such as Amplitude Modulation investigations and Sound Power (warranty) testing.


Planning applications for small-scale wind turbine or large-scale wind farm installations require a noise impact assessment to be undertaken according to ETSU-R-97 The assessment and rating of noise from wind farms.*

The ETSU-R-97 methodology essentially falls into two main sections; the assessment of the prevailing background noise level and the prediction of the noise levels from the turbines. By combining the results of these two, the environmental impact in terms of noise can be assessed.

It sounds simple but it’s a complicated process which isn’t surprising considering the nuances of acoustic assessments and the scale of the potential impact such developments may have on the community. This must of course be balanced with the desire to decrease our dependence on fossil fuels and meet emission targets.



For the prediction of noise from given turbine candidates, we use the world's leading software for modelling in accordance with ISO9613; B&K's Predictor software.

Complex topography and turbine data are entered, and a number of what-if scenarios run which aim to optimise the site's potential.



Once the development is operational, local authorities often require proof of compliance with the planning conditions, particularly when noise complaints are made. Monitoring in accordance with the latest guidelines and understanding the complexities of proving compliance or otherwise is based on our in-depth understanding of the planning process.



Instrumentation and data analysis is in our DNA. Our technical resources (including over 20 state-of-the-art sound level meters and data analysis experts) lends itself perfectly to detect complex acoustic phenomena like Amplitude Modulation and Tonality.

Our recommendations inform the development of operational profiles which maximise the available resource within planning conditions.


Sound Power:

Using B&K's dedicated hardware and software systems, we also undertake Sound Power evaluations in accordance with IEC 61400-11 Ed 3.0.

This is a very specialist application which only a company with our acoustic specialisation, experience within this sector and with our breath of instrumentation can undertake.


* Notwithstanding the fact that there is currently some development on the methodology for the impact assessment of wind turbines in Ireland, ETSU is still the de-facto guideline to follow. The Institute of Acoustics and many others have responded to the Irish Government’s review of the Wind Energy Development Guidelines (WEDG06) and details of the proposal and the responses to it can be found in the Useful Links page below. The review committee is expected to publish their proposals for public consultation in Q2/3 2018.