Extreme heat is often discussed in terms of its effects on health and well-being. However, rising temperatures also come with significant economic consequences. According to a recent study, the extreme summer weather experienced across Europe in 2026 could reduce the European Union’s GDP by around 1%, equivalent to €180 billion.
When considering the economic impacts of heatwaves, the first sectors that often come to mind are agriculture, transport and energy. Recent events provide clear examples.
Low water levels on the Rhine have disrupted freight transport, forcing goods onto road and rail networks. Along the Danube, insufficient cooling water reportedly led to reductions in output and temporary shutdowns at nuclear power plants in Hungary and Romania.
The hidden cost: Reduced worker productivity
These impacts are substantial, but they are not expected to be the largest source of economic losses. Agriculture, energy generation and transport are each estimated to account for only around 0.15% of the projected GDP impact.
The largest share of heat-related economic losses comes from a less visible and more difficult-to-measure factor: reduced labour productivity.
High temperatures place additional strain on the human body, which must work harder to regulate its internal temperature. In cities, this challenge is often intensified by the urban heat island effect, which can keep temperatures significantly higher than in surrounding rural areas, both day and night. As a result, physical working capacity can decline, particularly during heatwaves.
Heat also reduces the number of effective working hours. Workers need to take more frequent breaks, slow their pace of work or even stop work altogether until temperatures become more bearable and generally safer.
The effects are not limited to physically demanding occupations. Research shows that heat can also impair concentration, information processing and decision-making, affecting people engaged in cognitive and office-based work as well.
Climate adaptation as a general challenge for cities and beyond
As heatwaves become more frequent and intense, understanding their economic impacts is becoming increasingly important. The consequences extend beyond direct damage to infrastructure or disruptions to key sectors. They also concretely affect people’s daily lives, reduce their ability to work productively as well as make it more difficult form them to make effective decisions.
Addressing these challenges requires a combination of preparedness measures, urban planning strategies and long-term investments in climate resilience. Reducing heat exposure in cities can help protect both public health and economic productivity.
Through the CLIMACARE project, cities will develop and test integrated solutions to reduce heat stress, strengthen preparedness and support long-term urban resilience. By helping communities adapt to a warming climate, these measures can contribute to reducing the often overlooked economic costs of extreme heat.
Sources and further readings:
Triodos Bank. (2026, August 8). Europe’s extreme heat could wipe out EU growth in 2026 [Press release]. Link to the Press release and the study
García-León, D., Casanueva, A., Standardi, G., Burgstall, A., Flouris, A. D., & Nybo, L. (2021). Current and projected regional economic impacts of heatwaves in Europe. Nature Communications, 12(1), 5807. https://doi.org/10.1038/s41467-021-26050-z
Hallam, M. (2026, August 13). Romania shuts nuclear plant, Hungary dams dry Danube River. Deutsche Welle. Link to the article
Mealha, Q. (2026, August 12). Europe’s scorching summer could cost EU economies €180 billion. Euronews. Link to the article
Weiss, P., & Steitz, C. (2026, August 11). Low Rhine levels disrupting German industry. Reuters. Link to the article