Hungarian Prime Minister Péter Magyar on Thursday cast doubt on a deal struck by his predecessor that would see Russia’s state nuclear company Rosatom expand Hungary’s nuclear power capacity.

Weeks of extreme heat and drought have pushed the Danube River to record lows, slashing output at Hungary’s Paks nuclear plant — which normally supplies around a third of the country’s electricity — to little more than 10 percent.

“These plans were accepted despite the fact that nuclear power plants that do not operate with a closed-circuit cooling system and are so exposed to the environment are no longer being built in the world,” said Magyar, per local media.

Rosatom CEO Alexei Likhachev wrote that the Russian state nuclear company was still on schedule with two new reactors at Paks despite Hungary’s change of government in April, which saw Magyar oust Russia-friendly incumbent Viktor Orbán.

Concrete preparation for Unit 5 is more than 80 percent complete, he said, while work on Unit 6 is advancing and reactor components are already being manufactured.

“We are ready for dialogue,” Likhachev said, adding that Rosatom had received no questions from Hungary’s new government.

Magyar challenged that account hours later. Under the original contract, Paks II should have been operating by 2024, he told reporters in a press conference Thursday. Instead, Hungary has spent roughly 1,000 billion forints (€2.8 billion) on a site he described as little more than depots and “two large concrete pits.”

“I don’t really see that they have adhered to the contract,” Magyar said. His government is now carrying out a full review of the project, including its financing and cooling arrangements.

The review cuts at one of Orbán’s signature deals with Russia. Orbán struck the Paks II agreement in Moscow in 2014, handing Rosatom the two-reactor expansion backed by up to €10 billion in Russian state financing. Two years later, he called it the “deal of the century.”

Those ties survived Moscow’s full-scale invasion of Ukraine. As recently as March this year, Orbán’s foreign minister Péter Szijjártó admitted to discussing EU sanctions with senior Russian officials after leaked calls showed him boasting that a bank linked to Paks had been kept off a sanctions list.

Downstream, Romania shut the second and last operating reactor at Cernavodă on Thursday after the Danube fell too low to supply its cooling pumps.

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.