Severe low water levels on the Danube River have severely restricted nuclear power generation in Romania and Hungary, prompting an unprecedented daily energy export of 32.000-33.000 de megawați-oră from Bulgaria, according to Dimităr Zarcev, director of the Central Dispatcher at Bulgaria’s Electricity System Operator.
Regional Energy Deficit and Bulgarian Export Surge
Low water flow along the Danube has forced reduced output at the Cernavodă nuclear power plant in Romania and the Paks nuclear facility in Hungary. According to reporting from the Bulgarian publication Mediapool, Hungarian and Romanian energy traders submitted trans-border capacity requests to Bulgaria ranging from 3.500-4.000 MW to offset their domestic shortfalls.
Zarcev stated on public radio that Bulgaria has fully utilized its export opportunities to meet neighboring demands. Despite the regional strain, Bulgaria faces no domestic supply shortages. The Maritsa Iztok 2 coal plant is currently operating with five units, and high water levels in local reservoirs allow domestic hydroelectric plants to ramp up generation significantly.
Kozloduy Nuclear Plant Design and Independent Cooling Systems
The uninterrupted operation of Bulgaria’s Kozloduy Nuclear Power Plant relies on specialized engineering designed to withstand severe droughts. According to the Bulgarian Nuclear Regulatory Agency, the plant’s reactor cooling and fuel pool systems operate independently of the Danube River’s water levels.
Did you know? The Kozloduy facility uses closed loops to cool its reactors, eliminating heat through atmospheric evaporation via spray ponds. The plant also maintains alternative water sources, including a reserve in its cold canal and backup wells, alongside dedicated technological reserves.
Post-Fukushima stress tests and periodic safety evaluations conducted by international reviewers verified that Kozloduy lacks design deficiencies that would render its safety systems vulnerable to falling river levels, as confirmed by the regulatory authority.
Operational Monitoring and Future Mitigation Measures
Bulgarian Energy Minister Iva Petrova inspected the Kozloduy plant and noted that the facility can maintain its maximum capacity of 2.000 MW for several more weeks if current river conditions persist. However, continuous operational monitoring is now active.
The Nuclear Regulatory Agency warned that if low water levels persist and condenser cooling water becomes insufficient, plant operators will systematically reduce reactor power. Depending on water availability, one or both units at Kozloduy may face capacity cutbacks to ensure safety compliance during the prolonged dry spell.
Frequently Asked Questions
Why are the Cernavodă and Paks nuclear plants restricted?
Both plants face output limitations because low water levels on the Danube River restrict the volume available for cooling their condenser turbines.
How does Bulgaria’s Kozloduy plant continue operating at full capacity?
According to the Bulgarian Nuclear Regulatory Agency, Kozloduy uses independent closed-loop safety systems and atmospheric spray ponds that do not rely directly on the Danube River level.
What measures will Bulgaria take if low water levels continue long-term?
The regulatory authority stated that plant operators will reduce the power output of one or both units at Kozloduy if cooling water supplies drop below required thresholds.
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