Factcheck: How nuclear, gas, wind and solar power are affected during heatwaves
Carbon Brief examines how extreme heatwaves impact various energy sources, noting that nuclear, gas, and renewable power all face operational challenges during record temperatures. The report clarifies that while nuclear plants often reduce output due to cooling water constraints, all energy sectors are affected by rising demand and environmental stress.
Why it matters
Understanding the vulnerabilities of energy infrastructure to climate change is critical for policy planning and debunking misinformation regarding energy reliability.
Share Heatwaves are becoming more likely and more intense due to climate change, impacting sources of power generation around the world as they work to meet increased demand.
When temperatures soared past 40C in parts of Europe in June and July 2026, nuclear reactors shuttered, gas plants’ efficiency fell, wind speeds dropped and electricity networks sagged.
Yet, while all types of electricity generation are affected variously by extreme heat, some commentators are quick to point the finger at “ intermittent ” wind and solar , while downplaying the impact on sources such as gas or nuclear power.
Extreme heat also drives up electricity demand, as people turn on air conditioning and fridges work harder.
For example, in France, daily electricity demand rose by almost 20% during a two-week heatwave in June 2026.
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