Slovenia covered 82.8% of its electricity demand from domestic generation in 2025, according to the latest annual report from the country’s Energy Agency, highlighting both progress in domestic supply security and the growing impact of weather-driven variability on the power system.
Including Slovenia’s share of output from the Krško nuclear power plant, domestic facilities produced a total of 10,948 GWh of electricity. Over the same period, total electricity consumption—including grid losses—reached 13,228 GWh, leaving the country partially dependent on imports to meet demand.
Electricity production declined compared with the previous year, primarily due to weaker hydrological conditions that reduced output from hydropower plants. Additional pressure came from planned maintenance at Krško, which was offline for most of October. At the same time, operations at TEŠ Unit 6 (Šoštanj Thermal Power Plant) were largely dictated by district heating needs, limiting flexibility in electricity generation.
Despite these constraints, 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 experienced a significant decline, falling to 4,222 GWh from 5,450 GWh in 2024, reflecting unfavorable water conditions. As a result, total renewable output dropped by 13.3% year-on-year to 6,035 GWh. In contrast, solar power continued its rapid expansion, 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 noted that the results demonstrate continued progress in expanding low-carbon electricity sources. However, she also emphasized that fluctuating weather patterns and broader geopolitical uncertainties continue to test the resilience of Slovenia’s energy system, underlining the need for sustained investment in its long-term energy transition.
