Domestic supply share and generation volumes
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, with hydro output falling and solar expanding . Domestic facilities produced a total of 10,948 GWh of electricity when including Slovenia’s share of output from the Krško nuclear power plant. Total electricity consumption, including grid losses, reached 13,228 GWh, leaving the country partially dependent on imports to cover demand.
Hydrology, nuclear maintenance and thermal dispatch constraints
Electricity production declined versus the previous year, driven primarily by weaker hydrological conditions that reduced hydropower output. Planned maintenance at Krško also added pressure, with the plant offline for most of October . At the same time, operations at TEŠ Unit 6 (Šoštanj Thermal Power Plant) were largely determined by district heating needs, limiting flexibility in electricity generation.
Renewables mix: hydropower decline and solar growth
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 the remaining 24.4%. Hydropower fell to 4,222 GWh from 5,450 GWh in 2024, reflecting unfavorable water conditions.
Year-on-year renewable output changes
Total renewable output dropped by 13.3% year-on-year to 6,035 GWh. Solar power continued expanding, with photovoltaic generation rising to 1,606 GWh, up from 1,282 GWh a year earlier—an increase of roughly 25%. Energy Agency Director Duška Godina said the results show continued progress in expanding low-carbon electricity sources . She also pointed to fluctuating weather patterns and broader geopolitical uncertainties as factors testing the resilience of Slovenia’s energy system.
