Europe is facing an extraordinary energy and environmental crisis this summer, as searing heat and relentless drought have pushed the continent’s rivers to historic lows, threatening the operation of nuclear power plants and disrupting vital economic arteries. Nowhere is this more evident than along the Danube, where Hungary and Romania have been forced into drastic measures to keep their nuclear facilities online—or, in some cases, to shut them down entirely.
On August 12, 2026, Hungary’s Prime Minister Péter Magyar announced a bold intervention to rescue the country’s sole nuclear power plant, Paks, from an unprecedented shutdown. The Danube, which provides essential cooling water to the plant’s four reactors, had sunk to a record low of just 23 centimeters (9 inches) in Budapest, shattering the previous record set in 2018. Persistent drought and extreme heat waves had battered the region for months, and the river’s decline was so severe that Paks was operating at just over 10%—or, according to other reports, about 25%—of its 2,000 megawatt capacity, with only two of its eight turbines running. This facility usually supplies about a third—some sources say nearly half—of Hungary’s electricity, making its plight a national emergency.
“We can no longer consider this extraordinary situation as a one-time natural extreme,” Magyar declared in a Facebook video, as reported by multiple outlets. He outlined immediate plans to construct a bed sill—a low concrete or stone structure across the riverbed—to slow the current and raise upstream water levels. Delivery of approximately 145,000 cubic meters of rocks for the construction began that very evening, with the Hungarian military mobilized for round-the-clock work. The intervention, expected to cost around 6 billion forints ($19 million), could raise the Danube’s level by up to one meter (3 feet) near the plant.
As a short-term fix, two 80-meter (262-foot) barges were being readied for possible sinking near the Paks cooling pumps, which could nudge the water level up by an additional 20 centimeters (8 inches). A decision on whether to sink them was scheduled for August 14, 2026. Magyar emphasized the urgency: “The Danube has given us days, not months.” If water levels continued to fall without intervention, a complete shutdown of Paks was imminent—a first in its 44-year history.
The economic stakes are enormous. According to Magyar, the current low output at Paks is costing the Hungarian economy up to 50 billion forints ($158 million) per month. By comparison, the river engineering project’s price tag of 6 billion forints seems a bargain. “The prolonged low water levels on the Danube are causing enormous damage to the Hungarian budget and economy, which is why we needed to find a solution that can be implemented immediately,” he said.
Hungary’s crisis is part of a wider pattern across Eastern Europe. Downstream in Romania, the Cernavoda nuclear power plant—responsible for about 20% of the country’s electricity—has faced similar challenges. On August 13, 2026, the operator Nuclearelectrica began a controlled shutdown of its last working 680 MW reactor, citing the Danube’s continuing decline. This followed earlier efforts by Romanian authorities, including dredging the river channel, sinking rock-filled barges, and even carrying out a controlled underwater explosion to improve water flow to the plant’s cooling systems. Despite these unprecedented steps, the second reactor was nearly shut down overnight on August 13, but managed to remain operational for a little longer.
Romania’s government was not alone in its improvisation. Just a week earlier, similar measures were taken at the Cernavoda plant, where four barges loaded with rock were sunk in an effort to redirect water downstream. As Adrian Maizel, an official monitoring Danube traffic, told AFP, “We are making efforts to maintain a navigable channel as much as possible – albeit a narrower one – so that navigation is not completely blocked.” But the river’s depth along parts of Romania had already dropped a full meter below the navigable minimum, stalling cargo and tourist traffic alike.
The Danube’s woes have rippled far beyond the power sector. In Hungary, river traffic has ground to a near halt. Popular cruise ships, once a mainstay for tourists eager to sightsee in Budapest, have been forced to dock further upstream. Cargo ships have largely stopped operating, and in Bulgaria, police had to evacuate 186 tourists from a cruise ship that ran aground near Vidin. In Serbia, hundreds of small boats and dozens of cargo ships were left stranded as the river withdrew up to 20 meters from its usual shore.
For locals, the changes are startling. The receding water has exposed the base pillars of Budapest’s iconic Margaret Bridge, and even unearthed a World War II-era bomb. “The bare rocks, the dry sand bars around the bridge pillars ... it’s shocking to see how things were before and how they are now,” photographer Gabor Kertesz told the Associated Press. “Where will this lead, what will happen? We don’t know that yet, but this must be the result of climate change.”
Across the continent, the summer of 2026 has been marked by relentless heat, wildfires, and drought. In France, where nuclear power provides about 70% of electricity, utility giant EDF announced reductions at multiple reactors due to environmental issues. Three reactors at the Gravelines plant were shut down after a massive jellyfish swarm triggered automatic safety measures—the second year in a row this has happened. Meanwhile, Germany braced for another heatwave, with temperatures expected to approach 40°C (104°F), and the Robert Koch Institute reported over 9,800 heat-related deaths this summer—more than any full year since 2016.
European governments are scrambling to adapt. Options on the table include upgrading cooling systems, scheduling plant maintenance around extreme weather, and reconsidering the placement of critical infrastructure. In the UK, Prime Minister Andy Burnham convened an emergency Cobra committee meeting to address the impacts of heat, wildfires, and drought.
The broader economic fallout is significant. A recent analysis by Dutch bank Triodos estimated that Europe’s summer heat could cost the EU economy 180 billion euros ($207.7 billion)—about 1% of the bloc’s GDP—mainly through reduced labor productivity, higher food prices, disrupted transport, and constrained energy production.
As the continent’s rivers shrink and energy systems strain under the weight of climate extremes, the events on the Danube serve as a stark warning. Extraordinary engineering efforts may stave off disaster for now, but the underlying vulnerabilities remain. The question lingers: how long can these lifelines hold?