Across Europe and North America, intense heatwaves are pushing cities to their limits. Temperatures well above seasonal averages are affecting millions of people, placing unprecedented pressure on healthcare systems, energy networks, and public services. What once were considered exceptional weather events are becoming increasingly frequent and more severe, forcing municipalities to accelerate their climate resilience decisions.
The conversation often focuses on immediate responses – set up emergency support for fragile people, reinforce public health centers, strengthen power grids to meet the increased demand for energy and air conditioning. While these measures are essential, they address the symptoms rather than the real climate challenge.
The real question is how cities can become inherently more resilient to extreme heat.
Heat is an urban infrastructure issue
Cities amplify heat. Dense construction materials such as asphalt, concrete, and glass absorb solar radiation throughout the day and continue releasing it long after sunset, creating the well-known Urban Heat Island effect. Night-time temperatures remain high, reducing opportunities for recovery and increasing risks for vulnerable populations.
The consequences extend far beyond discomfort. Heat accelerates the deterioration of roads and public assets, impacts mobility and labour productivity, increases energy demand, and limits the usability of public spaces. As climate projections indicate that heatwaves will become longer and more frequent, climate resilience must become part of everyday urban planning.
This shift requires cities to look beyond single, tactical interventions and design integrated strategies where green infrastructure, digital technologies, and intelligent public assets work together.
Cities that adapt
A new index by Polish-led initiative COOLCITY ranked more than 11,000 European urban areas to assess climate adaption, measuring each city on a scale of 0 to 10 for land permeability, vegetation state, biodiversity, water and thermal conditions.
Stockholm topped the ranking with a score of 6.7. Of course, the Swedish capital benefits from a very peculiar geographical situation, being surrounded by forests and nature reserves, but it has also invested a lot on this advantage.
While not all cities are naturally favored, there are multiple complementary measures that can significantly improve climate resilience. Expanding green areas and urban forests, increasing shaded public spaces, using reflective construction materials, introducing permeable pavements, and integrating water-sensitive urban design all contribute to mitigating heatwaves by lowering surface temperatures.
Alongside these nature-based approaches, cities also need smarter infrastructure capable of operating more efficiently and providing better information for decision-making.
Energy efficiency is the first step
Streetlighting may not be the first piece of infrastructure associated with heatwaves and climate resilience. However, it represents a significant share of municipal power consumption, making it an ideal starting point for improving energy performance.
Modern LED technology combined with adaptive lighting controls enables municipalities to illuminate streets only when and where light is actually needed. By dynamically adjusting lighting levels according to traffic, pedestrian activity, weather conditions, or time of night, cities can significantly reduce electricity consumption without compromising safety.
This becomes particularly valuable during heatwaves, when electricity grids are already under considerable pressure due to increased cooling demand. Every efficiency gain contributes to reducing operational costs while supporting a more resilient energy system.
From lighting to environmental intelligence
The role of smart lighting in climate resilience strategies isn’t limited to energy efficiency. Lighting poles are among the most widespread and strategically distributed public assets within a city. If equipped with environmental sensors, they can become a dense monitoring network capable of measuring temperature, humidity, air quality, solar radiation, and other environmental parameters in real time.
This continuous stream of localised data enables municipalities to identify urban heat hotspots, monitor changing environmental conditions, support early warning systems, and better protect vulnerable communities during extreme weather events.
More importantly, historical datasets generated through these networks help urban planners understand how different neighbourhoods respond to heat, evaluate the effectiveness of mitigation measures, and prioritise future investments based on measurable evidence rather than assumptions. In this context, lighting infrastructure evolves from a passive asset into an active source of urban intelligence.
Climate adaptation will increasingly depend on cities’ ability to maximise the value of existing infrastructure rather than continuously adding new assets. Resilient municipalities will not necessarily be the ones investing the most, but those capable of integrating technology, sustainability, and intelligent infrastructure into a coherent long-term vision – and smart streetlighting will be part of the game.
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