RTE Transformer Cuts Power to 100,000 in Brittany as 40C Heat Exposes Grid Strain
Updated
Updated · BBC.com · Jul 1
RTE Transformer Cuts Power to 100,000 in Brittany as 40C Heat Exposes Grid Strain
1 articles · Updated · BBC.com · Jul 1
Summary
More than 100,000 people initially lost power in Ergué-Gabéric, Brittany, after an RTE transformer malfunctioned during temperatures of about 40C on 23 June.
Local authorities called it a heat-related incident, and social media video verified by RTE appeared to show smoke rising from the affected facility.
The outage came a day after RTE said there was "no concern" over electricity availability across its network this summer, underscoring how extreme heat can still hit critical equipment.
40C conditions can cut gas-fired power output by roughly 10% versus 20C, while hot weather also makes power lines sag and forces operators to limit electricity flows to avoid failures.
Britain and France are adapting infrastructure as climate change drives more frequent heatwaves, with recent disruptions already hitting hospitals, rail signalling and other essential services.
With AI demanding more power, is our tech boom accelerating the collapse of our heat-stressed energy grids?
As our critical technology melts under record heat, are we facing an inevitable cascade of systemic failures?
Brittany’s 2026 Heatwave Blackout: How Extreme Temperatures Exposed Europe’s Grid Vulnerabilities and Forced a Climate Adaptation Reckoning
Overview
In late June 2026, Brittany, France, faced a major power outage directly caused by severe and prolonged extreme heat. This heatwave, the second in a month after record-breaking May temperatures, was driven by atmospheric patterns that trapped hot air, all made worse by ongoing global warming. The intense heat put heavy strain on France’s electricity network, leading to system failures as demand soared and infrastructure struggled to cope. This event highlights how climate change is making extreme weather more frequent and severe, exposing the urgent need to strengthen energy systems and adapt to new climate realities.