June generation versus planned and prior-year output
The Krško nuclear power plant, jointly owned by Slovenia and Croatia, produced 495,096 MWh of net electricity in June 2026. That total was about 1% above the plant’s monthly production plan of 490,000 MWh. Generation was also higher than the 491,609 MWh recorded in June 2025, when output exceeded the corresponding target by 0.33%.
The June figures reflect both the planned comparison and the year-on-year performance against the prior June benchmark. Krško’s reported results were based on net electricity generation for the month.
Availability, capacity factors, and operational constraints
Krško reported an availability factor of 100% and a capacity factor of 100% for June. The plant said there were no technical problems affecting production during the period. It operated within its technical specifications, and all safety systems remained available.
The monthly output of 495,096 MWh equates to an average net output of approximately 688 MW. This indicates operation close to its effective net capacity across the month.
Market implications for Slovenia and Croatia during summer
The plant’s output is shared between Slovenia and Croatia, supporting both national electricity systems. Continuous generation provides a stable baseload block that reduces exposure to short-term imports and volatile fossil-fuel generation.
Nuclear availability is described as particularly relevant during summer conditions. Higher cooling demand and lower regional hydropower output can tighten the Southeast European balance, while solar generation declines rapidly during evening hours. Ongoing Krško output reduces the amount Slovenia and Croatia need to secure from neighbouring markets during those periods.
Regional price stability and interconnector flows
Krško’s performance is also linked to regional price stability. The source notes that a forced outage at a unit of this size would increase import requirements across Slovenia and Croatia.
Such an event could affect flows from Austria, Hungary, Italy, and the western Balkans. The plant is described as one of the most important jointly owned energy assets in Southeast Europe, with operating performance influencing congestion and price formation across surrounding interconnected markets.
Assessment beyond a single month
The June result is presented as an operational contribution, while nuclear economics are stated to require assessment over complete fuel and maintenance cycles rather than one month. Planned refuelling outages and long-term investment requirements are identified as key variables for annual availability and cost.
