Noise Impact Assessment for Major Housing Development in Glasgow, Scotland
Metrica Environmental Consulting was appointed by Banks Property to deliver a comprehensive residential noise impact assessment…
What is Shadow Flicker?
Shadow flicker is a natural visual effect that can occur when the rotating blades of wind turbines cast moving shadows over nearby buildings, creating a flickering change in light intensity through openings such as windows. It is typically considered at the planning stage for wind energy developments to understand and manage potential impacts on sensitive receptors.
Metrica provides specialist shadow flicker prediction and assessment services using computer modelling software, delivering robust and defensible assessments that support planning applications, complaint investigation and mitigation design.
When a Shadow Flicker Assessment is Required…
Shadow flicker assessments are commonly required where wind turbines or similar rotating devices are proposed near settlements or other sensitive receptors. This typically includes:
- Planning applications for onshore wind farms and single turbines;
- Environmental Impact Assessments (EIA) with shadow flicker as a component;
- Pre application studies to inform layout and design;
- Complaint investigations where flicker has been reported; and
- Review or discharge of shadow flicker planning conditions.
What We Do for a Shadow Flicker Assessment
We provide shadow flicker with developers, environmental consultants, engineers and residents. Our shadow flicker assessments are designed to quantify the potential for flicker effects at sensitive locations and to inform decision‑making and mitigation. They typically include:
Initial Screening and Scoping
We assess whether shadow flicker is likely to occur based on site layout, turbine dimensions, receptor locations and local topography. This initial scoping stage helps identify whether a full assessment is needed.
Shadow Flicker Modelling
Using industry‑standard software, we predict where and when shadow flicker may occur throughout the year. The modelling takes into account:
- Number, position and dimensions of turbines;
- Location and orientation of receptors (e.g., dwellings, workplaces);
- Solar position throughout the year;
- Terrain and surface features that can affect shadow paths; and
- Building openings (windows) where flicker can be experienced.
Impact Evaluation & Mitigation
We calculate predicted durations and frequencies of shadow flicker at each receptor and evaluate these against relevant planning guidance and thresholds. Where required, we advise on practical mitigation measures such as layout adjustments or screening options or turbine shutdown calendars.
5GW+
Wind Energy Consented
100+
Shadow Flicker Assessments Completed
60+
Wind Energy Developers Supported
Shadow Flicker Experience
We have undertaken shadow flicker assessments for some of the largest wind energy developments in the UK and internationally, ensuring that the right balance is struck between minimising impacts on local communities and supporting renewable energy delivery.
Our reporting is written in clear language suitable for planning officers, consultants and stakeholders, with technical detail clearly explained where needed.
Case Studies
Noise Impact Assessment for Residential Planning in Eggborough, Yorkshire
Metrica Environmental Consulting recently completed a residential noise impact assessment to support an outline planning application in…
Why Use Metrica for Your Shadow Flicker Assessment
Clients choose Metrica for shadow flicker assessments because we provide:
- Technically robust, defensible modelling using advanced software;
- Clear, planning aware reporting that regulators and stakeholders can rely on;
- Practical mitigation advice rooted in real operational experience; and
- A no nonsense, client focused approach that supports project progress.