Hungary to temporarily take a nuclear power plant offline due to low Danube water levels

Hungary is heavily dependent for its electricity on the country's only nuclear power plant. Paks is regarded as the backbone of national generation, and the failure of even a single unit has a noticeable impact on capacity. By asking large consumers to avoid consumption during peak hours in the late afternoon and evening, the government wants to prevent the grid from being overloaded. The appeals are directed, among others, at industrial facilities and office complexes.

The Danube issue is not limited to Hungary. In southeastern Romania, between Bucharest and the Black Sea city of Constanta, the river is reportedly carrying only around one third of its usual July water volume. Low water of this magnitude is rare in the region and is attributed by experts to a combination of low precipitation, high temperatures, and altered runoff patterns. The consequences for shipping, agriculture, and energy generation are felt along the entire course of the river.

Impacts along the Danube

The situation highlights the growing vulnerability of energy infrastructure to climate and weather extremes. River-based cooling is standard in many European power plants, but if water levels drop on a sustained basis, shutdowns or output reductions are the result. In Hungary, the additional factor is that alternative cooling methods are only available to a limited extent at short notice and the expansion of renewable capacity alone cannot close the gap.

The government also called on the population to use electricity sparingly. While the concrete appeals to reduce consumption are initially directed at large companies, private households can also contribute by shifting high-consumption activities such as running washing machines or charging electric cars to the morning hours. Energy suppliers say they are preparing for possible load shifts and are closely monitoring grid utilization.

Reaction of the government and consumers

Observers see the current situation as a stress test for Hungarian energy policy. The country has relied on nuclear power as a climate-friendly baseload for years and plans to expand Paks with new reactor blocks of Russian design. The current crisis cannot stop these plans, but it shows that even supposedly climate-stable energy sources remain sensitive to extreme weather conditions. What is decisive now is how quickly alternative cooling capacities can be created.

In neighboring countries, the development is also being followed closely. Since electricity grids in Central Europe are tightly coupled, a longer outage of a Paks unit could put additional pressure on supply in the region. The Hungarian authorities are therefore in contact with the transmission system operators of neighboring countries in order to coordinate imports or technical assistance if needed. How long the shutdown of the unit will last is currently open.

Outlook for the coming days

The weather forecasts provide little cause for relief for the time being. Although some rain is expected regionally in the coming days, a thorough rise in the Danube water level that would noticeably ease the situation is not in sight at present. Hungary is therefore preparing to extend the restrictions if necessary and to regularly inform the population about further developments.