Full Breakdown
Romania Shuts Down Remaining Reactor at Cernavoda Nuclear Plant Amid Record-Low Danube Levels
8/14/2026, 12:18:41 AM
Core Event
On the morning of 13 August 2026 Nuclearelectrica began a controlled shutdown of Unit 2 at the Cernavoda Nuclear Power Plant, leaving both 706-MW CANDU reactors offline. The decision follows a decline in the Danube’s flow to an all-time low of about 1,370 m³/s at the Romanian entry point on 11 August 2026. The plant normally supplies roughly 20 % of Romania’s electricity.
Background & Context
Cernavoda, Romania’s only nuclear source, uses Danube water for cooling. A continent-wide drought has pushed flow rates in nearly two-thirds of the river to their lowest in more than three decades, according to Copernicus. The plant previously shut down a single reactor in late July 2026; the last full shutdown was in 2003 under similar conditions.
Data & Statistics
- Reactor capacity: Two units, each 706 MW (?1.4 GW total).
- National generation share: About one-fifth of Romania’s electricity.
- Danube flow: 1,370 m³/s on 11 August 2026 (record low).
- Cross-border import capacity: Roughly 4,000 MW (Romanian Ministry).
- Peak demand on 5 August 2026: 7,675 MW; domestic output 5,321 MW; imports covered ~31 % of consumption.
Official Statements & Responses
- “Maintaining both units in a safe shutdown state has no impact on nuclear safety parameters, including personnel, the environment and the population,” — Nuclearelectrica.
- The Ministry of Energy said the grid’s cross-border transmission capacity would allow imports to cover the shortfall. “The national power grid has about 4,000 megawatts of cross-border transmission capacity to prepare for electricity imports,” — Romanian Ministry.
- An early warning was sent to the European Commission under Article 14 of Regulation (EU) 2019/941, requesting a regional assessment of generation and balancing reserves.
On-the-Ground Reports
Romanian naval divers detonated explosives on 3 August 2026 to clear a rock obstruction in the Danube’s Bala Canal, followed by dredging and sinking four rock-filled barges to redirect water toward the plant’s intake. Water levels continued to drop, prompting the shutdown.
Conflicting Reports & Gaps
Figures from the state water-management agency differ slightly, highlighting limited real-time monitoring data.
Why It Matters
Losing 1.4 GW of nuclear generation forces Romania to rely on wind, hydro (also water-constrained), coal-fired units, and imports. The event highlights the vulnerability of river-cooled nuclear facilities to hydrological extremes and raises concerns for neighboring Hungary’s Paks plant, which faces similar Danube-level challenges.
Verbatim Quotes
- “Maintaining both units in a safe shutdown state has no impact on nuclear safety parameters, including personnel, the environment and the population,” — Nuclearelectrica
- “The national power grid has about 4,000 megawatts of cross-border transmission capacity to prepare for electricity imports,” — Romanian Ministry
- “What this extreme heat and all of these knock-on impacts, including the wildfires as well as the drought that's affecting the rivers, what they tell us is that our climate system is in crisis.” — Gareth Remond-King, Energy and Climate Intelligence Unit
What’s Next
Romania’s energy ministry has prepared staged industrial curtailments if imports and alternative generation prove insufficient. The government also seeks European Commission approval to keep four coal-fired units available beyond August, pending the regional electricity-risk assessment.
