Europe’s summer power prices hit winter peaks amid unprecedented heatwave

An unprecedented heatwave gripping Europe this summer has driven electricity prices to levels typically reserved for the coldest winter months, straining power grids across the continent as cooling demand surges and generation capacity drops simultaneously.

On June 23, German day-ahead power prices reached €210/MWh, with contracts in France and Britain also hitting levels not recorded since January 2025, according to LSEG data. The same day, Britain's National Energy System Operator issued its first-ever summer electricity margin notice, calling on generators to produce more power.reuters+1

A Perfect Storm of Supply and Demand

The price spike was driven by a collision of factors. Temperatures exceeding 40°C in parts of Europe sent cooling demand soaring while simultaneously reducing output from multiple power sources. French nuclear output — Europe's largest fleet — was cut by over 9 gigawatts across 12 of its 57 reactors for several days as river temperatures used for cooling rose past operational thresholds, according to data from Kpler.marketscreener+1

Gas turbines, which provide almost 17% of the EU's electricity, also lost efficiency. A 30°C day can reduce a typical gas plant's output by around 7–12%, according to Rystad Energy data. Wind farms saw reduced output due to low wind speeds accompanying the heat, and even solar panels lost efficiency as high temperatures curbed cell voltage output.reuters+1

"The typical issue we witness is a mismatch … we see less electricity generation during heat waves … at a time where there is increased demand," said Laurent Bataille, executive vice-president of European operations at Schneider Electric.reuters

Gas Prices Compound the Crisis

European gas prices are now near their highest levels since Russia's 2022 invasion of Ukraine, as the war between the U.S. and Iran has disrupted energy flows from the Middle East, driving up electricity production costs. Bulgaria's energy regulator on July 31 approved a 4.6% increase in regulated gas prices for August, setting the new price at €39.43 per MWh — up from €31.75 in August 2025 — citing the need for more expensive Turkish gas imports to supplement Azerbaijani deliveries.sofiaglobe+2

The New Normal

Europe is the fastest-warming continent, and analysts warn the pattern will intensify. "I believe heat waves will become the norm, affecting gas and power prices," said Kpler analyst Alessandro Armenia, predicting even more volatility next summer. With air conditioning adoption rising across Europe but grid infrastructure still designed around winter peak demand, the mismatch between summer generation constraints and growing cooling needs presents a structural challenge for the continent's energy system.marketscreener+1