France has been forced to shut down multiple nuclear reactors as an intense heatwave continues to grip the country, pushing river temperatures to critical levels and threatening electricity production.

State-owned energy company EDF announced that three nuclear reactors have now been taken offline, while output at another facility has been reduced, as authorities work to comply with strict environmental regulations designed to protect rivers and aquatic ecosystems.

The unprecedented measures highlight the growing impact that extreme heat is having on Europe’s energy infrastructure.

Three Nuclear Reactors Shut Down

EDF confirmed that two additional reactors were shut down on Thursday at the Bugey Nuclear Power Plant in eastern France and the Nogent-sur-Seine Nuclear Power Plant northeast of Paris.

The closures follow the earlier shutdown of a reactor at the Golfech Nuclear Power Plant in southwestern France earlier this week.

In addition, electricity production has also been reduced at the Saint-Alban Nuclear Power Plant as temperatures continue to rise.

Rivers Becoming Too Warm for Cooling Systems

Unlike many conventional power plants, nuclear reactors require enormous amounts of water to cool their reactors safely.

That cooling water is typically drawn from nearby rivers before being returned downstream.

However, during extreme heatwaves, river temperatures rise significantly, making it impossible to continue normal operations without exceeding environmental safety limits.

French regulations are designed to prevent excessively warm discharge water from damaging aquatic ecosystems.

Environmental Rules Force Temporary Shutdowns

France operates one of the world’s largest nuclear power networks, with 57 nuclear reactors supplying roughly two-thirds of the country’s electricity.

Each facility must comply with strict environmental regulations governing river temperatures.

For example:

• At the Golfech Nuclear Power Plant, cooling water discharged into the Garonne River must not cause river temperatures to exceed 28°C (82.4°F).
• At Nogent-sur-Seine, regulations require that the Seine River remains below 28°C on average and that discharged cooling water does not increase river temperatures by more than 3°C downstream.

As current temperatures continue rising, several plants have been forced to reduce or halt operations to remain within those legal limits.

Heatwave Places Pressure on Europe’s Energy Supply

The shutdowns come as France experiences one of its most intense early-summer heatwaves in recent years.

Large parts of the country remain under extreme heat alerts, with temperatures climbing well above seasonal averages.

Ironically, electricity demand is also increasing as millions of households and businesses rely more heavily on air conditioning to cope with the dangerous heat.

The combination of rising demand and reduced nuclear generation presents additional challenges for the national electricity grid.

Climate Change Increasing Energy Risks

Scientists have repeatedly warned that climate change is making extreme heatwaves more frequent and more intense across Europe.

Higher air temperatures also warm rivers and reservoirs, reducing the availability of cool water needed to operate power stations safely.

As a result, periods of prolonged heat are becoming an increasing concern not only for public health but also for energy security and electricity production.

More Heat Expected Across France

Meteorologists expect the heatwave to continue over the coming days, meaning additional pressure could be placed on France’s nuclear fleet if river temperatures continue rising.

Energy officials are closely monitoring weather conditions and river temperatures while preparing for the possibility of further operational adjustments if environmental thresholds are exceeded.

The situation demonstrates how extreme weather is increasingly affecting critical infrastructure across Europe, with climate-related impacts now extending beyond agriculture and public health into the continent’s energy systems.