What is a Glint & Glare Assessment?
A Glint and Glare Assessment for Solar evaluates whether a solar photovoltaic (PV) installation could cause reflected sunlight that affects nearby receptors. These receptors can include:
- Residential properties;
- Roads and highways;
- Airports and aviation operations; and
- Other critical infrastructure.
For solar PV developments, the assessment determines potential visual impacts caused by sunlight reflecting off panels, helping developers manage planning risk and ensure compliance.
If your project involves assessing glare impacts from building façades, please see our Glare Assessments for Building Façades page.
How solar PV installations can cause glare
Solar panels are designed to absorb light; however, they also have the potential to reflect light towards receptors. Depending on orientation, tilt, and surrounding environment, sunlight can create reflections, potentially affecting drivers, residents, or air traffic. A Glint and Glare Assessment identifies and mitigates these impacts before construction.
When Are Glint and Glare Assessments Required?
Glint and Glare Assessments are typically requested by planning authorities or regulatory bodies for solar developments where:
- The site is near roads, airports, or high-traffic areas;
- Panels are likely to produce direct reflections toward sensitive receptors; and
- Local planning policies or aviation safeguarding guidelines require visual impact evaluation.
Undertaking a glint and glare assessment demonstrates that a developer has identified potential glint and glare impacts, and were required implemented mitigation to ensure adverse impacts are minimised.
What Does a Glint and Glare Assessment for Solar PV Involve?
Metrica’s glint and glare assessments for solar PV installations typically include:
Desk Glint and Glare Review
- Review of proposed layout, panel orientation, tilt angle, azimuth, and local topography;
- Identification of nearby sensitive receptors; and
- Identification of local screening, including topography, vegetation or buildings which may mitigation glint and glare.
Technical Modelling
- Calculation of the times and duration of glint and glare effects for a given location;
- Evaluation of intensity reflected sunlight; and
- Assessment of glint and glare impacts against international standards and guidance.
Mitigation and Reporting
- Recommendations for panel layout, tilt, or screening measures, where required; and
- Production of a robust, proportionate glint and glare report suitable for submission.
Our glint and glare assessments are practical, planning-focused, and tailored to each solar PV development.
Why Use Metrica for Your Solar Glint and Glare Assessment?
Metrica is a specialist environmental consultancy with extensive experience in renewable energy developments, including solar PV. In total, Metrica has helped deliver over 2000 acres of solar PV across the UK, and have provided hundreds of environmental impact assessments to support solar applications. Benefits of working with us include:
- Integrated expertise — glint and glare assessments delivered alongside noise, hydrology, and other environmental services;
- Practical solutions — clearly identify mitigation required to ensure glint and glare impacts meet international guidelines;
- Planning-focused reporting — clear, defensible assessments designed for planning applications; and
Responsive support — we work collaboratively with developers to deliver timely, practical advice, keeping projects on track. This is demonstrated by our repeated engagement with some of the largest solar developers in the UK.
Glint and Glare Assessments for Solar Across the UK
Metrica has undertaken glint and glare assessments on solar PV developments of all scales, from small scale rooftop mounted systems to Nationally Significant Infrastructure Projects (NSIP).
We support solar PV developments throughout the project cycle, from feasibility, application submission to post-consent. Our glint and glare assessments help developers identify, evaluate, and mitigate glare risks, ensuring solar projects are safe, compliant, and acceptable to stakeholders.