Slovenia met 82.8% of its electricity demand from domestic generation in 2025, according to the latest annual report from the country’s Energy Agency. The report links the outcome to falling hydro output and expanding solar generation. It also points to weather-driven variability affecting the power system.
Domestic generation and electricity balance
Domestic facilities produced a total of 10,948 GWh of electricity, including Slovenia’s share of output from the Krško nuclear power plant. Total electricity consumption, including grid losses, reached 13,228 GWh. The figures indicate that Slovenia remained partially dependent on imports to cover demand.
Hydrology, maintenance and thermal generation constraints
Electricity production fell versus the previous year, with weaker hydrological conditions reducing hydropower output. Planned maintenance at Krško contributed additional pressure, as the unit was offline for most of October. At the same time, operations at TEŠ Unit 6 (Šoštanj Thermal Power Plant) were largely driven by district heating needs.
This arrangement limited flexibility in electricity generation from TEŠ Unit 6 during the period covered by the report. The combined effects of hydrological conditions, Krško maintenance and thermal dispatch constraints shaped overall output levels. The annual report presents these factors alongside changes in renewable generation.
Generation mix: renewables share rises as solar expands
Renewable energy remained the dominant source in Slovenia’s electricity mix, accounting for 51.8% of total generation. Nuclear energy contributed 23.8%, while fossil fuel-based generation made up 24.4%. The report frames these shares within a year marked by weather-related variability.
Hydropower declined to 4,222 GWh, down from 5,450 GWh in 2024, reflecting unfavorable water conditions. Total renewable output fell by 13.3% year-on-year to 6,035 GWh. Photovoltaic generation increased to 1,606 GWh, from 1,282 GWh, an increase of roughly 25%.
Energy Agency assessment on low-carbon expansion and variability
Energy Agency Director Duška Godina said the results show continued progress in expanding low-carbon electricity sources. She also highlighted that fluctuating weather patterns and broader geopolitical uncertainties continue to test the resilience of Slovenia’s energy system. The report links these conditions to the need for sustained investment in its long-term energy transition.
