A new consideration for wind farm LVIA
As wind turbines grow taller, an increasing number of developments are reaching the thresholds at which aviation warning lights become a regulatory requirement. These visible lights, typically medium-intensity steady or flashing red lights mounted on turbine nacelles, are essential for aviation safety but introduce a new dimension to landscape and visual impact assessment that has, until recently, lacked formal guidance.
In response, NatureScot recently published its Guidance on Aviation Lighting Impact Assessment, providing a structured methodology for assessing the visual effects of aviation lighting during the hours of darkness and twilight. It is the first dedicated guidance of its kind in Ireland and the UK.
What does the guidance cover?
The guidance establishes a framework for assessing the visibility and visual impact of aviation lighting within the LVIA process. It addresses how lighting should be considered in terms of its effects on landscape character, visual amenity, and residential amenity during night-time and twilight conditions. It covers the technical characteristics of different lighting types, methods for determining theoretical visibility across a study area, and the production of night-time visualisations, including photomontages captured after dark.
The guidance recognises that the visual effects of aviation lighting are distinct from daytime turbine visibility. Factors such as light intensity and colour, flashing frequency, atmospheric conditions, background darkness levels, and the presence of other light sources all influence how impactful aviation lights are perceived to be. The assessment process therefore requires a different set of considerations and visualisation techniques to those used for standard daytime LVIA.
Why does this matter?
Visible aviation lighting has the potential to change the character of a landscape after dark, particularly in rural areas with low levels of existing artificial light. In areas recognised for their dark sky qualities, this is an especially sensitive consideration. Communities living near proposed developments are increasingly aware of the issue, and planning authorities are beginning to ask specific questions about how aviation lighting will affect the night-time environment.
Relevance to Ireland
There is currently no equivalent Irish guidance on aviation lighting impact assessment. Nevertheless, the topic has already arisen on a number of Irish wind farm projects, particularly in the context of proximity to designated Dark Sky areas. On a small number of projects, planning authorities have requested that aviation lighting effects be addressed within the LVIA, and night-time photomontage visualisations have been produced to illustrate how aviation lights would appear from sensitive viewpoints.
In the absence of dedicated Irish guidance, NatureScot’s methodology is being adopted as the primary reference for practitioners. As turbine heights continue to increase and Dark Sky designations gain prominence, aviation lighting impact assessment is likely to become a more routine component of LVIA for wind energy projects across Ireland.
MKO’s capability
Our LVIA team has a strong working knowledge of the NatureScot guidance and the methodologies it sets out. Our expertise in verified photomontage production, landscape and visual impact assessment, and the use of innovative visualisation tools provides a strong foundation for delivering this emerging area of assessment work. For further information on our LVIA and visualisation services, or to discuss how aviation lighting considerations may apply to your project, please contact: jworkman@mkoireland.ie