Alpine Hydro Inflows Halved by Drought as EC Flags SE Europe Power Emergency
Simultaneous reservoir deficits across the Alpine arc and Danube basin are cutting hydro and nuclear output and pushing European spot power prices sharply higher.
Reservoir inflows across the Alpine arc (Austria, Switzerland, France and northern Italy) were running nearly 50% below the 15-year historical average as of Thursday (2026-08-06), OilPrice.com reported, with Swiss hydro output set to remain constrained for the near term. The data place the Alpine system inside a wider drought that has already pushed spot power prices sharply higher further southeast.5
The European Commission said on Tuesday (2026-08-04) it was "closely" monitoring risks to southeastern Europe's electricity supply after record-low Danube water levels cut nuclear output across the region. A spokeswoman told Montel the bloc was ready to convene an emergency meeting if conditions worsened. Spot power on the Hungarian benchmark hub reached EUR 186.90/MWh on Monday (2026-08-03), nearly double the level recorded before the Danube drought intensified, Montel reported.4
Water scarcity is disrupting multiple generation technologies at once. In Serbia, the 1.14 GW Djerdap 1 hydropower plant on the Danube has been cut to just 30% of rated capacity, while the 270 MW Djerdap 2 facility is running at only 20%, Montel reported. Roughly 40% of southeastern Europe's nuclear capacity is also offline, energy experts said in the week of 2026-08-03. The two problems are linked: reactors require between 25,000 and 60,000 gallons of cooling water per minute, volumes a shrunken Danube cannot consistently supply, OilPrice.com reported on Thursday (2026-08-06).3,5
Romania's nuclear fleet, which normally supplies around a fifth of the country's electricity, has been among the hardest hit. Industrial consumers including automotive plants run by Dacia and Ford have paused operations to reduce power demand, OilPrice.com reported.5
The northern fringe is under parallel strain. Norway, which depends on hydropower for roughly 90% of its electricity, has recorded its lowest snow reserves in two decades, generating a 25 TWh energy deficit, OilPrice.com reported on Thursday (2026-08-06). Nordic hydro reserves overall stand 26 TWh below normal, and the 14-day weather outlook remains drier than seasonal norms, Montel EQ data show.5,2
Analysts told Montel that a broader expansion of European wind and solar output could cushion some of the impact, with rising renewable generation spurring cross-border imports and limiting regional supply gaps in the near term. But the current renewable fleet cannot fully absorb an Alpine, Nordic and Danube deficit playing out together during a sustained heatwave.2
ICE Endex TTF front-month gas was near €55.74/MWh when European markets opened on Friday (2026-08-07). German power opened Friday (2026-08-07) European trade near €131.16/MWh, with no near-term relief indicated by the regional weather outlook. [live prices]
Europe's warming trajectory is the long-running backdrop. The continent reached approximately 2.5 degrees Celsius above pre-industrial levels last year, more than double the global average warming rate and faster than any other major continental region, the European Centre for Medium-Range Weather Forecasts and World Meteorological Organisation reported, according to Montel. Hydropower across Alpine and Nordic systems is increasingly exposed to concurrent snow deficits and summer droughts of the kind now playing out together.1
The immediate marker is the EC's own monitoring threshold. A spokeswoman said on Tuesday (2026-08-04) the bloc was ready to convene an emergency meeting if southeastern European power conditions deteriorated further. With Alpine inflows at roughly half of historical norms and Djerdap plants operating at a fraction of rated output, there is limited buffer before that threshold is crossed.4,5