The Danube River dropped to 23 centimeters in Budapest on Wednesday — a record low well below the previous all-time mark of 33 centimeters set in 2018. [1] The river, which runs through 10 countries from southwestern Germany to the Black Sea, has receded to never-before-seen lows along much of its course, exposing rocks, sandbars, and old shipwrecks.

The drought's most consequential impact is on nuclear energy. Hungary's Paks nuclear plant, which supplies nearly half the country's electricity, began powering down a reactor on Wednesday due to restricted cooling-water supplies. Two successive reductions in power output at two reactors preceded the shutdown. [1]

In Romania, where Danube water flow fell to 1,630 cubic meters per second — roughly a third of the typical July average — authorities shut down a reactor unit at the Cernavoda power plant for safety reasons and announced another would follow. [1]

Satellite imagery from Copernicus Sentinel-2, acquired between August 1 and 3, confirms the crisis extends beyond the Danube. Sections of the Loire in France, the Po in Italy, the Rhine in Germany, and the Danube near Paks in Hungary all show exceptionally low water levels with extensive exposed sandbanks and gravel bars. [2]

The shipping impact has been immediate. Cargo vessels have stopped operating nearly entirely on the Hungarian stretch of the Danube. In Bulgaria, police evacuated 186 tourists from the Viking Ullur cruise ship after it ran aground near Vidin, running out of food and water. [1]

In Serbia, hundreds of small boats and dozens of cargo ships were marooned near Novi Sad. "The water in the Danube has withdrawn some 15 to 20 meters from its shore," said boat owner Radovan Segrt. "The summer season is over now, as far as boat riding is concerned." [1]

The drought's effects on agriculture are feeding into the energy transition debate, where biofuel targets and crop-based ethanol mandates conflict with food security priorities. Germany's wheat production is projected to fall to 18.65 million tons. [1]

European inland shipping accounts for approximately 7% of total freight tonnage-kilometers, and the Danube alone handles roughly 100 million tons of cargo annually. The drought has turned a transportation artery into a political question about climate adaptation.

-- DARA OSEI, London