Dry Danube Forces Hungary and Romania to Curtail Nuclear Output

Paks Plant Seeks Emergency Cooling Solutions

The Danube’s water level fell dramatically in early August, leaving Hungary’s Paks nuclear plant operating at roughly 10% of its capacity and prompting Romanian troops to blast a rock formation to boost flow to the Cernavoda reactor. Both plants rely on the river for cooling, and the shortage threatens continuous power supply across the region.

Low water levels stem from an unusually dry summer and reduced snowfall in the Carpathian basin. With less water to draw, the reactors cannot reach safe operating temperatures, forcing operators to limit output or shut down units entirely. In Hungary, the Ministry of Energy announced emergency measures, while Romania’s military intervened to clear a bottleneck that had slowed water delivery to the Cernavoda site.

Hungary’s Paks facility, which supplies about 20% of the country’s electricity, has been forced to run at a fraction of its designed output. Plant manager István Kovács said, „We are monitoring river levels hourly and adjusting turbine output to stay within safety margins.” The plant has turned to auxiliary cooling towers that use groundwater, but these can only support limited capacity. Energy analysts estimate a shortfall of up to 1.5 gigawatts if river flow does not improve within weeks. The government is negotiating temporary water releases from upstream reservoirs in Serbia and Austria, hoping to raise the Danube’s level enough for safe cooling.

Can Romania’s Emergency Measures Keep Cernavoda Running?

Romanian authorities responded by ordering a controlled explosion on a rock outcrop near the Cernavoda intake. Colonel Andrei Popescu explained, „The blast was necessary to restore the river’s natural channel and increase flow speed toward the cooling system.” Early measurements show a modest rise in water velocity, but experts warn that the improvement may be short‑lived if the drought persists. The Cernavoda plant, which contributes roughly 15% of Romania’s power, has already reduced its output by 30% and plans to operate only two of its five reactors until water levels stabilize. Officials are also exploring supplemental cooling using seawater from the Black Sea, though logistical challenges remain.

The dual crisis underscores the vulnerability of nuclear facilities to climate‑driven water scarcity. Both countries are evaluating long‑term strategies, including diversifying cooling sources and investing in renewable energy to offset potential nuclear shortfalls. Regional cooperation on water management could become a critical component of energy security in the coming years.

Frequently Asked Questions

Why does low river water affect nuclear reactors? Nuclear plants need large volumes of water to remove heat from the reactor core. Insufficient flow can cause overheating, forcing operators to cut power or shut down units.

What immediate actions are being taken? Hungary is using groundwater cooling towers and seeking upstream water releases. Romania has cleared a river bottleneck and is testing alternative cooling methods.

Will the power shortages be permanent? Experts believe the reductions are temporary, tied to the current drought. However, prolonged dry periods could force longer‑term changes to energy policy and infrastructure.