Hungarian Power Prices Double as Nuclear Losses and Record Heatwave Drain Southeast European Supply
Day-ahead prices nearly doubled in a week on nuclear losses of up to 2.4 GW and record-low Danube levels, with Budapest warning of an unprecedented supply emergency.
Hungarian day-ahead power prices nearly doubled in the week to Monday (2026-08-03), Montel reported, as nuclear outages, record-low Danube water levels and an intensifying heatwave simultaneously stripped supply across southeast Europe.4
A sustained move of that size across seven days points to accumulated generation losses rather than a single demand surge. Utilities and industrial buyers covering short positions in thinly traded southeast European markets found supply unavailable at any previous clearing price. Spot prices in these markets can gap sharply, and a double in a week is not the kind of move that typically reverses until generation comes back online.4
The 2 GW Paks nuclear plant, Hungary's largest single generation source, is unlikely to restart in the near term, Montel reported, with total capacity losses across Hungary estimated at roughly 2.4 GW by late July (2026-07-31). Paks represents a substantial share of domestic output. During a regional heatwave, importing from neighbours provides limited relief because those markets are also managing their own peak demand simultaneously.3
Late on Thursday (2026-07-30), Prime Minister Peter Magyar addressed the public directly, calling for electricity conservation and warning that Hungary faced "a critical energy supply situation never before seen in Hungary's history." Governments rarely deploy that kind of language without cause. Losing the equivalent of a major nuclear plant in summer, with peak demand simultaneously rising, strips the grid of any meaningful operating buffer.3
The Danube cooling-water problem responds most slowly to any response Budapest or plant operators can mount. Record-low river levels restrict output from nuclear and thermal plants that rely on the river for cooling. The hotter temperatures get, the higher demand climbs and the lower river levels fall. Recovery is conditional on weather, not on operator decisions or government decrees.4
The strain spread regionally. Montel reported supply tightening across southeast Europe as the heatwave entered what it described as its "most critical" phase. Southeast European power markets are not deep, and regional cross-border capacity is limited. When Hungary cannot run its normal surplus generation, neighbouring markets absorb the shortfall at a premium. Price signals cross borders quickly in interconnected grids, even when physical electricity does not.4
Broader European gas markets showed little reaction. ICE Endex TTF front-month gas was flat in early trading on 2026-08-06, holding at €52.20/MWh in the morning session. The divergence between power spot prices nearly doubling and TTF holding flat points to a grid-level supply problem that has not yet translated into wider European fuel demand.
Hungary's gas transit politics add a separate layer. Budapest announced a ban on selling gas transit capacity to Ukraine for the third quarter — a move analysts told Montel on Friday (2026-05-15) was "political, not supply driven." Ukraine imported 2.97 billion cubic metres from Hungary last year, roughly 40% of its annual gas demand, Montel reported. But traders told Montel on Wednesday (2026-05-20) that Kyiv had sufficient alternatives to absorb any cut.1,2
Without a Paks restart timeline, and with Danube levels offering no near-term recovery signal, Hungary's power supply deficit is likely to persist through August. An emergency capacity declaration from Budapest or a formal request for cross-border interconnection support would be the clearest sign the situation has moved past what routine market operations can handle.3,4