Europe’s electricity market is facing a new seasonal reality: extreme summer heat is pushing power demand and wholesale prices towards levels traditionally associated with winter. During the June 2026 heatwave, electricity demand rose sharply across the continent as households, businesses and offices turned to air conditioning. In Germany, daily electricity consumption increased from 1,267 GWh on 11 June to 1,396 GWh on 25 June, while France saw demand climb from 1,048 GWh to 1,255 GWh—an increase of almost 20%. Wholesale prices responded strongly: Germany exceeded €200/MWh, France approached €160/MWh, and Spain rose above €110/MWh during the peak of the heatwave. France’s grid operator RTE estimates that each additional 1°C of heat can increase electricity demand by roughly 0.7–1 GW, as cooling becomes increasingly important.
The problem is that extreme heat can simultaneously increase demand and weaken electricity supply. During the June heatwave, Germany experienced sharply lower wind generation, while France had to reduce nuclear output by around 4.1 GW because high river temperatures limited the availability of cooling water. In Britain, the grid operator restricted electricity exports to continental Europe during parts of the July heatwave to protect domestic supplies. This is a warning that Europe can no longer plan its power system around a simple winter-demand model. Solar power is expanding rapidly—the EU generated a record 52 TWh of solar electricity in June, equal to 25% of its electricity generation—but the challenge is increasingly about storing that daytime solar power and delivering it during hot evening hours when cooling demand remains high. The message is becoming clear: Europe needs more than renewable generation; it needs batteries, stronger grids, flexible demand and climate-resilient power plants to prevent hotter summers from becoming the new energy-price crisis. More