Heat curtailed up to 4% of Spain's gas plants this summer as European demand hit multi-year highs
Thermal shutdowns across Spanish gas-fired capacity struck just as heatwave-driven generation across western Europe ran far above recent seasonal norms.
Up to 4% of Spain's gas-fired power plants were knocked offline by thermal curtailments at some point this summer, Montel reported on Thursday (2026-09-10), a supply-side squeeze that arrived as European gas generation ran at its highest levels in recent years.8
Montel Analytics calculated that combined average gas-fired output across Italy, Spain, France, Britain and Belgium ran 6.59 GW above 2024 and 2025 summer averages this season. Spanish generation was up 28% year-on-year, adding roughly 3.1 GW to the national grid — an identical percentage gain to Italy's over the same period.5
The driver was heat. Repeated heatwaves suppressed nuclear output and eroded hydropower reserves, pushing the gas fleet into a compensating role across western Europe. France lost 18% of its nuclear capacity to environmental factors in mid-July 2026, according to Ember, extending a pattern of summertime outages that has recurred in recent years. With French supply constrained, Spanish exports were pulled into filling a wider regional deficit, analysts told Montel.6,7
Cooling demand then amplified load. Ember data showed Italy's total electricity consumption rose 28% in late June 2026 compared with the previous week as extreme temperatures arrived. France saw a 14% jump over the same period. With only 23% of European households having access to or using air conditioning, load climbed largely unchecked as heat persisted.6
Solar provided partial offset. Europe's panels generated 17% more electricity during the heatwave periods than under normal irradiation, according to Ember, providing afternoon support as cooling demand peaked. But that supply does not extend into the evening demand ramp, and it did nothing for gas plants operating below capacity because of ambient temperature limits or reduced turbine output in the heat.6
Spain's position has a dimension worth separating from the immediate stress. Wind and solar now account for more than 40% of the country's total electricity supply, and the Bank of Spain has calculated that wholesale electricity prices were 40% lower in 2024 than they would have been had the generation mix stayed at its 2019 composition. But the grid still depends on gas to firm output when wind and solar fall short — which in sustained heat tends to coincide with peak cooling load.2
Analysts have drawn pointed conclusions from the summer's sequence. Montel cited commentary suggesting Europe's repeated heatwaves could generate an energy stress comparable in severity to a Hormuz disruption scenario, given the simultaneous compression of nuclear, hydro and now gas supply. Climate change, one analyst said, has made what was once exceptional into something recurrent.7
ICE Endex TTF front-month gas traded at €79.29/MWh at 08:15 UTC on Thursday (2026-09-10), while THE month-ahead stood at €80.48/MWh at the same timestamp. Both levels suggest the market absorbed this summer's disruptions without a sustained price spike, in part because EU gas consumption was running roughly 10% below prior-year comparables through the first part of this year, limiting the net draw on storage.3
Storage arithmetic was already tight before the summer curtailments began. The Oxford Institute for Energy Studies estimated in a study published on Wednesday (2026-05-20) that Europe would need to import roughly 6 billion cubic metres — about 6% more than last year's intake — to enter winter with equivalent storage volumes, even accounting for weaker overall demand. If elevated gas-fired generation persisted through late September, room for that recovery narrows.1
Whether the Spanish curtailments prove seasonal or structural is the question traders will carry into next year. Standard Chartered commodity analysts have noted that temperature swings historically move European energy prices across the calendar. If this summer's thermal shutdowns recur — with air conditioning penetration growing and peak demand rising alongside it — the 28% uplift in Spanish gas generation may prove not a one-off stress response but the new seasonal floor for the fleet.4,5