Romania Shuts Down Last Operating Nuclear Reactor at Cernavodă Due to Low Danube River

Romania took Cernavodă’s second and last operating nuclear reactor offline on Thursday after the drought-hit Danube River fell too low to supply its cooling pumps.

“At 10:53 a.m., Unit 2 of Cernavodă NPP was shut down in a controlled manner,” Romania’s Energy Ministry said in a press release.

The government insisted the national grid remained stable and said it would bridge the shortfall with imports, hydropower, wind, coal and reserve generation. Romania had already notified the European Commission of an electricity crisis after the shutdown of Unit 1 on July 28, with Unit 2 accounting for roughly another 700 megawatts — about 10 percent of national production.

Cernavodă could stay offline for a while. “The forecast for the next 10 days shows a continuous decrease in the flow and level of the Danube,” plant director Romeo Urjan told Romanian news outlet Digi24 on Tuesday evening, saying officials did not expect to restart Unit 2 during that period.

Emergency dredging, rock blasting and sunk barges had bought the reactor roughly another week of operation.

The shutdown is the latest fallout from a drought emptying Europe’s rivers. Copernicus Sentinel-2 satellite images released last week showed the Danube shrinking dramatically compared with last summer, exposing sandbanks and parched countryside north of Budapest in Hungary.

The river has hit a record low in Hungary, while record-low levels have also been reported in Romania, disrupting shipping and straining energy and water supplies.

Hungary is scrambling to keep its Paks nuclear plant operating. With output down to little more than 10 percent, Prime Minister Péter Magyar ordered the construction of a riverbed barrier Wednesday and put two barges on standby to be sunk if the Danube falls further.

Cernavodă’s two reactors normally supply around a fifth of Romania’s electricity. Before this summer, drought last forced a reactor there offline in 2003.