AleRunner writes: "Solar has been doing the 'heavy lifting' to help Europe meet its energy needs amid a string of blistering heatwaves," Euronews tells us. Meanwhile, as Europe's energy demands rise with the heat, jellyfish have been causing shutdowns and reduced power output at multiple reactors at French nuclear plants, as we already discussed. Euronews reports: A new analysis from energy think-tank Ember found that solar output in European countries rose by up to 17 percent on heatwave days in June and July. Researchers say that this helped power the grid as electricity demand increased by as much as a quarter on hot days. Heatwaves often trigger a spike in electricity consumption due to the sudden need for cooling, mainly from energy-intensive air conditioning (A/C) units.

The International Energy Agency (IEA) estimates that space cooling, which is mostly A/C units and fans, consumed around seven percent of the world's electricity in 2022. Even in countries where A/C ownership is low, countries experience energy demand spikes when scorching temperatures hit. During the early summer heatwaves of 2025, France, for example, recorded an evening electricity peak that was 25 percent above the off-season average due to air conditioning.

Ember's analysis found that during the late-June heatwave this summer, daily electricity demand rose byup to 28 percent in Italy, 23 percent in Hungary, 14 percent in France and 13 percent in Spain compared with pre-heatwave days. It says as heatwave-driven demand increased, solar was the only major power source to perform "better than usual." Compared with other days in June and July, average daily solar generation during the heatwaves was 17 percent higher in France and Hungary, five percent higher in Spain and the same in Italy.

Read more of this story at Slashdot.