News summary produced by Claude AI
On 23 June, France experienced one of its hottest days on record, with temperatures reaching approximately 40 degrees Celsius in some regions. In the Breton town of Ergué-Gabéric, extreme heat caused an electrical transformer to malfunction, disrupting power to more than 100,000 residents. The incident occurred despite assurances from power company RTE that electricity availability would be stable throughout the summer season.
Engineers and scientists increasingly recognize that high temperatures significantly degrade the performance of electrical and telecommunications infrastructure. Power generation facilities lose efficiency during heat events, with gas-fired power stations operating at roughly 10% reduced output at 40 degrees compared to 20 degrees. Solar panel efficiency also declines with temperature, though newer technology has mitigated this effect somewhat. Additionally, metal power lines expand in heat and sag under their own weight, requiring operators to restrict electricity flow to prevent cables from contacting trees or buildings below, a scenario that contributed to a major blackout in North America during 2003.
Telecommunications and railway signalling systems face distinct challenges from overheating. Metal cabinets used for equipment outdoors can exceed 70 degrees Celsius during heatwaves, potentially causing metal connections on circuit boards to expand and crack. Temperature fluctuations can also trigger false alarms in security systems, while excessive heat increases “thermal noise” that may cause data errors in computing and communications equipment. Recent examples include a July 2022 UK heatwave that caused data centre failures at Guy’s and St Thomas’ hospitals in London, leading to cancelled operations when cooling systems failed.
UK energy networks are currently implementing climate resilience strategies to address these vulnerabilities, and some rail operators have begun testing liquid-based cooling systems for signalling equipment. Experts note that expanding overall electricity network capacity would provide additional flexibility during extreme heat events. However, the independent Climate Change Committee warned that cascading power outages from extreme heat could disrupt digital payments, transport, and public services, potentially costing billions of pounds in coming years as climate change brings increasingly frequent and intense heatwaves to the region.