The Krško nuclear power plant, jointly owned by Slovenia and Croatia, generated 487,438 MWh of net electricity in September 2026. The figure was 1.53% below the plant’s monthly production target. Despite the shortfall versus plan, output was higher than in the same month a year earlier.
For September, the plant had planned to produce 495,000 MWh. That schedule implied an output gap of approximately 7,562 MWh between planned and actual net generation. Year-on-year production rose by around 8.5%, compared with 449,426 MWh recorded in September 2025.
September generation vs. annual comparison
In September 2025, Krško exceeded its planned output of 446,000 MWh by 0.77%. The latest operating figures for September 2026 show the plant did not match its monthly generation plan this time. However, the year-on-year increase indicates higher net electricity generation than the prior year’s month.
The operating report said the plant remained within its technical operating specifications and that all safety systems were available . It also reported that both the availability factor and capacity factor were at 100%. No technical problems were identified during the reporting period.
Operational reliability and system role
The data suggests the September shortfall was not accompanied by a reported operational failure . At the same time, the available information does not specify the precise cause of the difference between planned and actual electricity output. The figures therefore distinguish between meeting a monthly generation target and broader operational reliability.
Krško’s generation is described as low-carbon baseload supply for both Slovenia and Croatia. Its output is particularly relevant when regional electricity markets see reduced wind and solar generation or higher electricity demand. For both countries, predictable nuclear production supports supply planning and helps manage wholesale electricity procurement requirements.
The September results also show that net generation remained substantially above the corresponding month of 2025. No technical or safety-related interruption was reported during the period . The operating outcome points to a relatively limited variance in production rather than evidence of a material deterioration in plant reliability.
