June 2026 Heatwave Causes Major Strain on French Electricity Network with Widespread Outages

On June 24, 2026, France experienced severe stress on its electricity infrastructure due to an unprecedented heatwave, leaving approximately 85,000 households without power. The region of Brittany was particularly hard hit, suffering giant outages as the intense heat caused underground cables to weaken. Nuclear reactors, a key part of France's energy supply, also slowed down, further straining the power grid.

This disruption occurred on a day when France recorded a new temperature record with a day-night average of 30°C. While meteorological forecasts suggest a gradual easing of the heatwave in western France by the end of the week, high temperatures are expected to persist elsewhere until early next week.

The combination of soaring temperatures and associated infrastructure challenges has exposed vulnerabilities in the country's energy system, highlighting the difficulties in maintaining reliable electricity supply under extreme weather conditions. The nuclear plants' reduced output and compromised underground cables were significant factors leading to the outages. As France navigates the remainder of the heatwave, energy authorities are likely to prioritize measures to stabilize the grid and prevent further disruptions.