Wind energy developments require a robust wind turbine noise assessment to demonstrate compliance with planning policy and to address potential effects on nearby receptors. With many years’ experience in wind farm noise, our acoustic consultants undertake detailed wind farm noise assessments to support planning applications, environmental impact assessments (EIA), and operational compliance investigations across the UK.

We work with developers, planners and landowners to provide clear, concise wind turbine noise reports, supported by appropriate measurement, modelling and technical analysis. Our assessments are structured to align with planning requirements and to stand up to scrutiny from local authorities and consultees.

When is a Wind Turbine Noise Assessment Required?

A wind turbine noise impact assessment is typically required when:

  • A new wind turbine development is proposed;
  • A wind farm Environmental Impact Assessment (EIA)‎ is required;
  • An existing wind farm is seeking to renew some, or all of the turbines (AKA ‘repowering’); or
  • Planning conditions require the discharge or verification of operational noise limits.

Our Approach: What is Involved in a Wind Turbine Noise Assessment?

A typical wind farm noise assessment includes the following elements:

Baseline Noise and Wind Speed Monitoring

If necessary, we undertake background noise monitoring in accordance with best practice guidance set out in the Institute of Acoustics Good Practice Guide, typically using long-term unattended surveys correlated with wind speed data. Monitoring locations are selected to represent the nearest and / or most sensitive receptors.

Noise Modelling and Prediction

We use specialist software to carry out wind turbine noise modelling, predicting noise levels at surrounding properties. This includes consideration of turbine sound power data, site layout, topography, atmospheric conditions and other nearby wind farms. Outputs typically include noise contour plots and detailed prediction tables.

Assessment Against Relevant Guidance

Assessments are generally undertaken in line with the UK Government’s Assessment and Rating of Wind Turbine Noise (ARWTN), formerly ETSU‑R‑97: The Assessment of Noise from Wind Farms. This approach establishes site-specific noise limits, ensuring that wind turbine noise emissions are appropriately controlled across a range of wind speeds.

Cumulative Assessment

Where other wind farms are present or consented nearby, we assess cumulative wind farm noise to demonstrate compliance with combined noise limits. This is often a key consideration for wind energy developments in more constrained areas.

Design and Layout Input

We provide advice throughout the design stage, including turbine selection, layout optimisation and operational strategies, to achieve compliance with wind turbine noise limits while maintaining project viability.

Mitigation and Operational Controls

Where necessary, we identify mitigation measures such as reduced noise operating modes or turbine management strategies linked to wind speed and direction, ensuring compliance with planning conditions.

All findings are presented in a clear, structured wind turbine noise assessment report suitable for planning submission or EIA as appropriate.

Additional Services

We also support wind energy projects through:

  • Wind farm feasibility studies and noise constraint mapping;
  • Consultation with local authorities and statutory consultees;
  • Drafting and negotiation of wind turbine noise planning conditions;
  • Post-consent compliance assessments and condition discharge;
  • Operational wind farm noise monitoring; and
  • Investigation of wind turbine noise complaints or wind farm upgrade monitoring.

In addition to the above, we also undertake turbine sound power level testing in accordance with relevant standards where required.

Experience

We have delivered wind turbine noise assessments for a wide range of developments, from single turbines to large-scale wind farms across the UK and internationally. Our experience includes both onshore and offshore projects, as well as complex cumulative noise assessments for wind farms and operational compliance work.

This experience provides a practical understanding of how wind farm noise constraints influence wind turbine development of all scales, including single landowner and community schemes, through to Section 36 / Nationally Significant Infrastructure Projects (NSIP).

Case Studies

Why Use Metrica for Your Wind Turbine Noise Assessment

Metrica is a specialist environmental consultancy with extensive experience in wind turbine acoustics and wider environmental support.

Benefits of working with us include:

  • Technically robust wind turbine noise assessments - carried out in accordance with ARWTN / ETSU-R-97 and best practice industry guidance;
  • Clear, pragmatic noise reports - with content and the level of detail tailored for the specifics of each project;
  • Design-led acoustic advice - early input to resolve wind turbine noise constraints;
  • Planning-focused approach - we a wealth of experience preparing defensible acoustic evidence; and
  • Integrated environmental services - our team is well versed in pragmatic and productive coordination with related disciplines including Traffic & Transport, Landscape & Visuals, Hydrology, Ecology and Cultural Heritage.