SEE Power Markets Face Q3 Spike Risk as Heatwaves Threaten to Overwhelm Nuclear Buffer
Southeast European power prices are vulnerable to sharp moves this quarter, with extreme heat expected to outpace recovering nuclear availability and push day-ahead prices higher.
Extreme weather will be the dominant driver of southeast European power prices in the third quarter, with renewed heatwaves likely to trigger fresh price spikes despite improving nuclear availability, market observers told Montel on Friday (2026-07-03).6
The warning comes as European power benchmarks have already traded at elevated levels through much of 2026. ICE Endex TTF front-month gas — the input cost that sets the marginal price of gas-fired generation across continental Europe — stood at €44.22 per megawatt-hour on Friday (2026-07-03), down 1.73% on the day but still at levels that make incremental gas burn for power generation expensive across southern and southeastern Europe.6
Southeast European grids are particularly exposed to temperature shocks. The region depends heavily on thermoelectric generation and cross-border imports from better-interconnected western markets, and cooling demand from the residential and commercial sectors builds quickly once sustained heat settles over the Balkans. Forward contract pricing in southeast European markets can move sharply before physical tightness materialises in day-ahead auctions.6
Nuclear availability is improving. France's fleet has been recovering from corrosion-related outages, and Balkans nuclear plants have completed much of their planned spring maintenance. Analysts still cautioned this buffer has clear limits. River temperatures constrain cooling water intake at thermal plants during sustained heat episodes, and southeast European interconnection capacity cannot reliably draw on surplus wind generation from wind-rich markets to the north and west during the calm anticyclonic conditions that typically accompany a heat dome.6,5
The Italian power market illustrates how quickly prices can move when weather extremes meet tight generation capacity in southern Europe. Analysts warned in May (week of 2026-05-18) that Italian Q2 power prices could surge as much as 44% if supply disruptions escalated alongside an energy-intensive summer, with gas prices identified as the key driver. Italy's market connects structurally to southeast European prices through the Adriatic interconnection corridor.1
The transmission channel from heat to price runs through gas. When cooling demand pushes electricity consumption above what nuclear and renewables can cover, older and less efficient gas peakers are pressed into service at high marginal cost, pulling the entire system price upward. Earlier this year, Montel-polled analysts estimated Europe could see power prices jump 10% from spring levels during a hot, dry summer. Southeast European markets accumulate cooling degree days faster than markets further north and tend to amplify those moves.2
Gas supply risk from the Middle East added a further layer of upside risk through the spring. Global gas prices surged during the week of 2026-05-18 on fears of disruption to flows through the Strait of Hormuz. Around 25% of Europe's total gas supply is LNG, according to Chris Wheaton, oil and gas analyst at Stifel, which means any sustained Middle East supply disruption feeds directly into European hub pricing and from there into the marginal cost of regional power generation.3
European power prices had already spiralled to multi-year highs earlier in 2026 on the combination of commodity and carbon price pressure and low wind output. Analysts told Montel at the time that prices were not expected to ease quickly, and the Q3 heat risk assessment from Friday (2026-07-03) reinforces that view for southeast Europe specifically.4
What would shift the picture is a wetter and cooler August than the extended forecast currently suggests, or a faster return of nuclear capacity than markets expect. The next signal is evidence of a blocking high-pressure system over the Balkans in the medium-range forecasts — a persistent anticyclone through late July would move market observers from conditional warnings to active price alerts.6