Iceland vs Slovenia: Primary energy use by source
Iceland
0.0104 terawatt-hours
in 2025
Slovenia
0.0068 terawatt-hours
in 2025
Iceland rank
70th
Slovenia rank
71st
Primary energy use by source over time
- Iceland
- Slovenia
How they compare
Iceland currently reports 0.0104 terawatt-hours against 0.0068 terawatt-hours in Slovenia, a difference of 0.0036 terawatt-hours.
That makes Iceland's figure about 1.5 times Slovenia's.
The two have swapped places 5 times across 36 shared years of data; in 1990 it was Slovenia ahead.
Iceland ranks 70th and Slovenia ranks 71st of 79 countries.
Iceland has averaged higher in every one of the 4 decades both report.
Head to head by decade
| Decade | Iceland | Slovenia | Difference | Ahead |
|---|---|---|---|---|
| 1990s | 0 terawatt-hours | 0 terawatt-hours | 0 terawatt-hours | — |
| 2000s | 0 terawatt-hours | 0 terawatt-hours | 0 terawatt-hours | — |
| 2010s | 0.0053 terawatt-hours | 0.0038 terawatt-hours | 0.0015 terawatt-hours | Iceland |
| 2020s | 0.0081 terawatt-hours | 0.0062 terawatt-hours | 0.0019 terawatt-hours | Iceland |
Averages of every year both report within each decade.
Frequently asked questions
- Which has higher primary energy use by source, Iceland or Slovenia?
- Iceland, at 0.0104 terawatt-hours against 0.0068 terawatt-hours in Slovenia as of 2025.
- What is the difference in primary energy use by source between Iceland and Slovenia?
- 0.0036 terawatt-hours, with Iceland ahead.
- How many years of comparable data are there for Iceland and Slovenia?
- 36 years are reported by both, from 1990 to 2025.
- How do Iceland and Slovenia rank globally for primary energy use by source?
- Iceland ranks 70th and Slovenia ranks 71st of 79 countries.
- Where does this data come from?
- Energy Institute - Statistical Review of World Energy (2026); Smil (2017) – with major processing by Our World in Data, published as Primary energy use by source. Statizoid refreshes it automatically from the source and publishes the full history for both places.
Individual pages
About this data
Measured in terawatt-hours of total energy supply.