A severe heatwave swept across Europe, triggering unprecedented spikes in electricity prices as demand for cooling surged while generation capacity declined simultaneously. The combination of rising consumption and falling output created acute supply pressures in multiple markets, with British grid operators paying exceptionally elevated rates to secure imports.
In Great Britain, electricity system operators paid approximately £470 per megawatt-hour to import power during peak evening hours, representing more than six times the comparative market price from the previous year and triple the cost just one day earlier. German power prices climbed toward €545/MWh, marking the highest levels since 2024, while French markets reached €268/MWh, the strongest reading since 2023. The price escalation reflected a perfect storm of constrained supply—five British gas plants reduced output due to extreme temperature conditions, cutting roughly 2.5 gigawatts of capacity, while wind generation plummeted as the high-pressure system weakened wind speeds significantly below seasonal norms.
Nuclear and thermal generation faced additional challenges across the continent. French nuclear facilities operated below capacity as elevated river temperatures complicated cooling systems, while solar farms experienced efficiency losses despite contributing steadily to British supply through clear skies. Wind power generation in Great Britain fell to between 13 and 15 percent of the electricity mix on Tuesday, compared to typical June levels near 30 percent, necessitating additional imports from continental sources already struggling with their own heatwave impacts.
Utility operators deployed multiple strategies to manage the crisis. British grid managers activated demand-reduction schemes offering financial incentives to households cutting consumption during peak periods, expecting savings of approximately 115 megawatts. System operators characterized such balancing measures as routine operational responses despite the exceptional nature of the market conditions, which grid officials attributed to the broader climatic event affecting electricity infrastructure across multiple nations simultaneously.
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