Bulgaria vs Slovakia: Primary energy from fossil fuels, nuclear, and renewables
Bulgaria
24.0%
in 2025
Slovakia
32.5%
in 2025
Bulgaria rank
7th
Slovakia rank
3rd
Primary energy from fossil fuels, nuclear, and renewables over time
- Bulgaria
- Slovakia
How they compare
Slovakia currently reports 32.5% against 24.0% in Bulgaria, a difference of 8.5%.
That makes Slovakia's figure about 1.4 times Bulgaria's.
The two have swapped places 8 times across 61 shared years of data; in 1965 it was Slovakia ahead.
Bulgaria ranks 7th and Slovakia ranks 3rd of 216 countries.
Across the 7 decades both report, Bulgaria averaged higher in 2 and Slovakia in 4.
Head to head by decade
| Decade | Bulgaria | Slovakia | Difference | Ahead |
|---|---|---|---|---|
| 1960s | 0.0% | 0.0% | 0.0% | — |
| 1970s | 2.8% | 0.6% | 2.2% | Bulgaria |
| 1980s | 10.6% | 11.1% | 0.4% | Slovakia |
| 1990s | 18.2% | 17.1% | 1.0% | Bulgaria |
| 2000s | 23.9% | 23.9% | 0.1% | Slovakia |
| 2010s | 22.6% | 24.4% | 1.8% | Slovakia |
| 2020s | 24.3% | 28.4% | 4.1% | Slovakia |
Averages of every year both report within each decade.
Frequently asked questions
- Which has higher primary energy from fossil fuels, nuclear, and renewables, Bulgaria or Slovakia?
- Slovakia, at 32.5% against 24.0% in Bulgaria as of 2025.
- What is the difference in primary energy from fossil fuels, nuclear, and renewables between Bulgaria and Slovakia?
- 8.5%, with Slovakia ahead.
- How many years of comparable data are there for Bulgaria and Slovakia?
- 61 years are reported by both, from 1965 to 2025.
- How do Bulgaria and Slovakia rank globally for primary energy from fossil fuels, nuclear, and renewables?
- Bulgaria ranks 7th and Slovakia ranks 3rd of 216 countries.
- Where does this data come from?
- Energy Institute - Statistical Review of World Energy (2026); Smil (2017); U.S. Energy Information Administration (2026) – with major processing by Our World in Data, published as Primary energy from fossil fuels, nuclear, and renewables. Statizoid refreshes it automatically from the source and publishes the full history for both places.
Individual pages
About this data
Measured as a percentage of total energy supply.