Country energy profile · Slovenia · 2025
What percentage of Slovenia’s energy comes from fossil fuels?
In 2025, fossil fuels supplied 63.2% of Slovenia’s total energy. Oil is its largest single source. That compares with a world average of 86.2%.
Oil 42.1%, natural gas 13.2%, coal 7.9% · non-fossil 36.8%.
Source: Energy Institute Statistical Review of World Energy 2025 data. Site updated August 13, 2026.
Slovenia energy mix, 2025
Share of total primary energy by source
Key facts
| Fossil-fuel share | 63.2% |
| World average | 86.2% |
| Main fossil fuel | Oil |
| Change since 2010 | -8.4 pts |
| Fossil energy per person | 74.0 GJ |
| CO₂ per person | 5.2 t |
| Fossil share of electricity | — |
| World rank, fossil energy used | #73 of 80 |
Is Slovenia getting less dependent on fossil fuels?
Fossil-fuel share of total energy since 1965, with the absolute amount of fossil fuel used. Share and volume can move in opposite directions.
Fossil share vs. consumption
Left axis: % of primary energy · Right axis: exajoules (EJ)
Oil vs. gas vs. coal in Slovenia
Consumption by fuel, 1965–2025
Exajoules (EJ) per year
Frequently asked questions
What percentage of Slovenia's energy comes from fossil fuels?
In 2025, fossil fuels supplied about 63.2% of Slovenia's total primary energy: oil 42.1%, natural gas 13.2% and coal 7.9%. The world average is 86.2%.
What is Slovenia's main energy source?
Slovenia's largest fossil fuel is oil. Non-fossil sources make up 36.8% of its energy.
Is Slovenia reducing its dependence on fossil fuels?
Since 2010, Slovenia's fossil-fuel share of energy has fallen by 8.4 percentage points, to 63.2%.
Compare with other countries
Source: Energy Institute Statistical Review of World Energy, 2025 data (annual series back to 1965). See methodology.