From September 2025 through August 2026, low-carbon sources supplied almost four-fifths of Slovenia’s electricity consumption. Nuclear provided about 40%, hydropower about 25%, solar about 12%, and biofuels almost 2%. Fossil fuels supplied around 18%, comprising roughly 11% coal and 8% gas, while net imports accounted for just over 2%. Nuclear was therefore Slovenia’s largest electricity source, underpinning a predominantly clean electricity mix.

Is Electricity Growing in Slovenia?

The latest figures do not show Slovenia exceeding its historical electricity consumption or low-carbon generation records, although these comparisons alone cannot establish the year-to-year trend. Electricity consumption in 2026 stood at about 6,400 kWh per person, roughly 2,100 kWh—or 25%—below the 2014 record of about 8,500 kWh. Low-carbon electricity generation reached about 5,100 kWh per person, around 1,400 kWh—or 21%—below its 2014 peak. These gaps are concerning: Slovenia needs growing clean electricity supplies to support electrification and future demand, including from AI.

Suggestions

Slovenia should expand its established nuclear and solar generation while also developing suitable wind projects. Nearby Slovakia, where nuclear supplies about 66% of electricity, and France, at 67%, demonstrate the substantial contribution nuclear can make to a clean electricity system. Hungary’s approximately 22% solar share offers a particularly relevant regional example, while Spain generates about 23% of its electricity from solar. For wind, Slovenia could learn from neighboring Croatia and Austria, where wind supplies about 16% and 12%, respectively, including their approaches to project development and grid integration. Together, these technologies could increase domestic low-carbon electricity generation and displace fossil-fuel electricity, reducing climate-changing emissions and air pollution.

History

Slovenia’s low-carbon electricity history includes substantial gains alongside considerable fluctuations in hydropower. In the 1990s, hydro generation increased by 0.7 TWh in 1991, while nuclear generation rose by 0.7 TWh in 1994. The 2000s brought further hydro gains: 1.1 TWh in 2004 and a combined 1.5 TWh across 2008–2009. During the 2010s, hydro fell by 1 TWh in 2011, then gained a combined 2.2 TWh in 2013–2014; nuclear also added 1.1 TWh in 2014. Hydro subsequently fluctuated, dropping 2.3 TWh in 2015 before gains in 2016 and 2018, separated by a decline in 2017. More recently, hydro fell 1.6 TWh in 2022, rebounded by 1.9 TWh in 2023, and declined by 1.3 TWh in 2025 and another 0.8 TWh in 2026. This uneven generation trajectory reinforces the importance of expanding nuclear, solar, and complementary clean electricity capacity.

Electricity Imports and Exports

Balance of Trade

* 12M = Last 12 months (Sep 2025 – Aug 2026) — a rolling 12-month period, not a calendar year.