Drought Threatens a Third of Italy's Thermal Fleet While Solar Overperforms Across Europe
Italy's cooling water shortage this August threatened 20 GW of thermal capacity and kept spot power near EUR 200/MWh, illustrating how European power supply increasingly depends on water availability.
Europe's solar panels generated 17% more power than normal during this summer's heatwaves, Ember data published on August 25 (2026-08-25) showed, cushioning grids as afternoon cooling demand climbed. The same weather pressed thermal generators from the opposite direction.6
In Italy, cooling water shortages threatened up to 20 GW of thermal capacity, nearly one-third of the country's fleet, during the August heat event, an analyst told Montel on Thursday (2026-08-06). The analyst said the exposure was likely enough to keep Italian spot power near EUR 200/MWh.5
Drought and sustained heat deprive gas and nuclear plants of cooling water precisely when demand peaks, while simultaneously extending the solar generation window. For Italian power traders, both effects arrived at once in August. The net result is not a wash: thermal curtailment removes dispatchable, controllable megawatts, while solar surplus arrives in a concentrated afternoon window and vanishes at dusk.5,6
Battery systems helped shift that solar surplus into evening hours, when cooling demand persists long after sunset. Walburga Hemetsberger, CEO of SolarPower Europe, said storage is increasingly indispensable for that handover period. European grids installed 36 gigawatt-hours of battery capacity in 2025, up 48% on year-earlier additions, Canary Media reported.6
France's state-owned utility is spending accordingly. The company plans to commit over $10 billion over the next 15 years to adapt its nuclear and hydropower plants to warmer temperatures and lower water availability, including equipment aimed at reducing cooling-water requirements, Canary Media's August 25 (2026-08-25) report said. That adaptation budget puts a dollar figure on what Italian operators implicitly already face.6
Europe added more than 70 GW of renewable capacity in 2025, led by Germany, Spain and France, a study published May 21 (2026-05-21) by analysts at Montel's EnAppSys, EQ and Energy Brainpool showed. Rising renewable capacity has not consistently cut emissions. Only Finland combined green buildout with actual emissions reductions across the continent, the study found.1
Intermittency sharpens that contradiction. Germany recorded negative power prices 10% of the time in the first eight months of this year, up from 5% through all of 2024 and 3% in 2023, according to The Economist. Michael Waldner, CEO of Pexapark, a Zurich-based renewable energy consultancy, described the market as "screaming for capacity" — meaning dispatchable backup and storage, not more generation.2
Europe added a record 8.8 GWh of battery storage in 2024, ten times the 2020 figure. But storage deployment has not kept pace with renewable variability, and Italy's summer cooling-water episode illustrated the cost of that gap: nearly a third of dispatchable thermal capacity sidelined when the grid needed it most.2,5
Prime Minister Giorgia Meloni has been pushing to overturn Italy's four-decade nuclear ban, citing energy security fears and high power prices, E&E News reported May 21 (2026-05-21). The August thermal shortfall adds weight to that argument, though public opposition in Italy remains deep and the legislative path is far from clear.3
Analysts told Montel in June (2026-06-24) that electrification — Europe's stated route to cutting end-use emissions — is lagging behind the pace of renewable buildout, with consumers bearing rising cost burdens. ICE Endex TTF front-month gas fell 2.39% to €78.17/MWh on September 16 (2026-09-16), suggesting European gas markets are not pricing immediate supply stress. Yet Italy's reliance on thermal baseload, combined with a drought pattern analysts say is intensifying, means the August cooling-water episode is unlikely to be the last time generation constraints push Italian spot power back toward EUR 200/MWh — and the next test may arrive before the continent has meaningfully added either storage or alternative dispatchable capacity.4,5,6