The disconnection of Unit 2 at Cernavoda this week came after the first reactor had already been taken offline in late July, eliminating 1,400 megawatts of reliable baseload power. The facility, operated by state-owned Nuclearelectrica, ordinarily supplies 20 percent of Romania’s total electricity output through its two 706-megawatt reactors. The company announced it needed to shut the second reactor “due to the significant and ongoing drop” in the river’s water level and did not foresee a restart within the next 10 days.

Until now, Cernavoda had only been shut down once before in 2003, making this closure an exceptionally rare event that underscores the severity of the current climate crisis. Data from the National Administration of Romanian Waters indicated the river level at Cernavoda dropped to -227 centimeters, critically close to the absolute operational minimum of -230 centimeters.

Desperate Engineering Interventions Prove Insufficient

The decision to halt operations came only after extraordinary engineering interventions failed to combat the climate-induced drought. In a desperate bid to save the plant, the Romanian military utilized 180 kilograms of explosives to blast rocks on the riverbed, attempting to redirect the diminishing flow toward the cooling intake channels. Authorities also sank four massive barges loaded with stone to create an artificial underwater barrier, hoping to channel more water to the critical cooling systems.

Despite these extreme measures costing an estimated EUR 2 million, the fierce evaporation rates rendered the efforts insufficient. Earlier this week, authorities had tried to increase water flow to the plant by sinking additional barges loaded with rocks in the river, but the drought-hit Danube could not maintain adequate levels for reactor operations. Nuclearelectrica management stated the timeline for resumption remains entirely dependent on unpredictable rainfall patterns.

Nearly two-thirds of the Danube has seen flow rates drop to the lowest on record for a July in 34 years, according to analysis from the European climate change observatory Copernicus. The waters in Europe’s second-longest river have fallen to the lowest levels for 30 years in several countries, creating cascading impacts across the continent.

Romania Declares Energy Emergency

The shutdown has triggered an immediate state of energy emergency across Romania for the entire month of August. The government has ordered major industrial consumers, including carmakers Dacia and Ford, to pause production until August 19 to help with the power deficit. Romania has also asked companies and households to reduce consumption during peak hours to avoid overwhelming the grid.

Romania’s energy ministry announced it had turned on a 330-megawatt lignite-fired power plant and was relying on increased wind generation to compensate for the shortages. The ministry emphasized it would also utilize hydro power based on available water in reservoirs, though those resources have been heavily cut by the same low river levels that caused the nuclear shutdown. The shortfall in power is usually covered by solar and wind during the hot, windy daytimes, but traditional coal- and gas-powered generation will have to be supplemented by imports during evening hours.

The government has warned that as a last resort, large industrial users would face restrictions in the evening hours to save electricity, a measure that could further impact Romania’s economic output during an already challenging period.

Moldova Faces Immediate Power Crisis

Shutting down the reactor posed immediate problems for Moldova, Romania’s eastern neighbor, which has also endured low river levels and relies on Romanian power to cover up to 60 percent of its own electricity shortages. With Romanian imports now unavailable, Moldova faces the prospect of increased purchases from Ukraine if Kyiv can supply the power, buying more expensive power from western countries, or imposing rolling power cuts.

“I think we should be ready for a worsening situation, including power outages, although it’s hard to say for sure right now,” Moldovan energy expert Sergiu Tofilat told Radio Chisinau.

The crisis illustrates how climate-driven events can rapidly cascade across national borders, creating regional instability in essential services and highlighting the vulnerability of interconnected energy systems.

Climate Crisis Threatens Nuclear Infrastructure Across Europe

The drought has hit nuclear power providers across Europe, exposing a critical vulnerability in the continent’s energy infrastructure. In neighboring Hungary, Prime Minister Péter Magyar warned last month that the Soviet-era Paks nuclear plant, which has four reactors, could be forced to shut down entirely for the first time. Plant officials reported that levels in the Danube were so low that the suction nozzles used to take in water could not reach it, though Hungary has so far avoided a complete shutdown.

France, which uses nuclear power to generate about 70 percent of its electricity, recorded a more than 20 percent shortfall in atomic production capacity this week, a record deficit caused by heat-related outages. The pattern reveals a fundamental weakness in nuclear infrastructure that depends on river cooling systems during precisely the periods when climate change makes those water sources least reliable.

Climate change is driving up temperatures around the world, but particularly in Europe, which is the fastest warming continent, heating up twice as fast as the global average according to the Copernicus climate service. This acceleration is causing increased summer heatwaves, greater pressure on Europe’s waters, and more intense wildfires.

Broader Continental Impacts

The Rhine, another of Europe’s key waterways, is also suffering low water levels, severely limiting commercial traffic and creating additional economic disruptions. The continent’s agricultural sector has taken a noticeable hit, with Italy’s largest agricultural trade association, Coldiretti, reporting that climate-related damage from hail, drought, and wildfires could exceed EUR 3 billion.

The converging crises underscore the interconnected nature of climate impacts, where a single extreme weather event can simultaneously disrupt energy production, transportation infrastructure, food security, and cross-border energy agreements. As Europe continues to experience record-breaking temperatures and prolonged droughts, the vulnerability of critical infrastructure designed for previous climate conditions becomes increasingly apparent.

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