Full Breakdown
Hungary Sinks Barges and Builds River Sill to Keep Paks Nuclear Plant Cool Amid Drought
8/16/2026, 1:54:32 AM
Emergency River-Level Measures
Hungarian authorities are undertaking two parallel engineering actions to raise the Danube’s water level at the Paks Nuclear Power Plant. 80-metre barges are being positioned near the plant and will be deliberately sunk to create a temporary dam, while crews construct an underwater “sill” (a low-head weir) that will slow the river’s flow and lift upstream water. The government plans to begin the controlled sinking of the barges on August 15 and to start building the sill immediately, with completion expected within several weeks.
Background: Drought-Induced Cooling Crisis
A prolonged heat wave and severe drought have driven the Danube to record lows across Central and Eastern Europe. The river supplies cooling water for both Hungary’s Paks plant and Romania’s Cernavoda facility. In late July, Romania shut down its last operating reactor after the Danube fell below the level required for safe cooling. Hungary’s Paks plant, which normally provides about one-third of national electricity, has been forced to run at a fraction of its 2,000 MW capacity, raising fears of a first-time full shutdown in its 44-year history.
Data & Statistics
- Water level at Paks’s pumping station rose ? 1 cm after the first barge was lowered.
- Sinking the two barges is projected to raise the local water level by ? 20 cm (8 inches).
- The permanent sill is expected to increase the level by up to 1 m once completed.
- Approximately 5,000 t of stone and 145,000 m³ of rock are being delivered for the sill.
- Hungary estimates the emergency measures will cost ? 6 billion forints (about $19 million), versus monthly economic losses of >= 50 billion forints if Paks were forced offline (Bloomberg, AP).
- Paks is currently generating 485 MW, reported as roughly 25 % of capacity by Bloomberg and “little more than 10 %” by AP.
Official Statements & Responses
Prime Minister Péter Magyar has framed the operation as essential to avoid a nationwide blackout, describing the situation as “extraordinary” and emphasizing that the measures are “long-term” solutions to prevent future water-level crises.
Conflicting Reports & Gaps
Sources differ on the current output share of Paks: Bloomberg reports about 25 % of capacity, while AP states “little more than 10 %.” Both figures are presented as factual statements by their respective outlets, and no definitive source reconciles the discrepancy. The exact volume of water that the sill will ultimately retain remains an engineering estimate (“up to 1 m”) without independent verification.
Verbatim Quotes
- “The controlled sinking (of the barges) is expected to begin late this afternoon in order to raise the water level on the Danube,” — Peter Magyar, prime minister
- “We have begun construction of the low weir that will permanently contribute to raising the Danube's water level,” — Peter Magyar, prime minister
- “Maintaining both units in a safe shutdown state has no impact on nuclear safety parameters, including personnel, the environment and the population,” — Romania's Nuclearelectrica
What’s Next
- August 15 – scheduled sinking of the two barges to provide an immediate 20 cm lift.
- Mid-August onward – construction of the riverbed sill, with rock deliveries continuing daily; the project is expected to be operational within a few weeks.
- Authorities have deployed soldiers and heavy equipment to accelerate work as forecasts indicate the Danube could fall below critical thresholds again soon.
