Japan vs South Africa: Annual change in primary energy from nuclear
Japan
27.75 terawatt-hours
in 2025
South Africa
7.68 terawatt-hours
in 2025
Japan rank
4th
South Africa rank
7th
Annual change in primary energy from nuclear over time
- Japan
- South Africa
How they compare
Japan currently reports 27.75 terawatt-hours against 7.68 terawatt-hours in South Africa, a difference of 20.07 terawatt-hours.
That makes Japan's figure about 3.6 times South Africa's.
The two have swapped places 16 times across 60 shared years of data; in 1966 it was Japan ahead.
Japan ranks 4th and South Africa ranks 7th of 219 countries.
Across the 7 decades both report, Japan averaged higher in 5 and South Africa in 2.
Head to head by decade
| Decade | Japan | South Africa | Difference | Ahead |
|---|---|---|---|---|
| 1960s | 0.8008 terawatt-hours | 0 terawatt-hours | 0.8008 terawatt-hours | Japan |
| 1970s | 21 terawatt-hours | 0 terawatt-hours | 21 terawatt-hours | Japan |
| 1980s | 34.98 terawatt-hours | 3.36 terawatt-hours | 31.61 terawatt-hours | Japan |
| 1990s | 39.82 terawatt-hours | 0.5267 terawatt-hours | 39.3 terawatt-hours | Japan |
| 2000s | -12.9 terawatt-hours | -0.0094 terawatt-hours | 12.89 terawatt-hours | South Africa |
| 2010s | -63.34 terawatt-hours | 0.4481 terawatt-hours | 63.79 terawatt-hours | South Africa |
| 2020s | 14.36 terawatt-hours | -1.79 terawatt-hours | 16.15 terawatt-hours | Japan |
Averages of every year both report within each decade.
Frequently asked questions
- Which has higher annual change in primary energy from nuclear, Japan or South Africa?
- Japan, at 27.75 terawatt-hours against 7.68 terawatt-hours in South Africa as of 2025.
- What is the difference in annual change in primary energy from nuclear between Japan and South Africa?
- 20.07 terawatt-hours, with Japan ahead.
- How many years of comparable data are there for Japan and South Africa?
- 60 years are reported by both, from 1966 to 2025.
- How do Japan and South Africa rank globally for annual change in primary energy from nuclear?
- Japan ranks 4th and South Africa ranks 7th of 219 countries.
- Where does this data come from?
- Energy Institute - Statistical Review of World Energy (2026); Smil (2017) β with major processing by Our World in Data, published as Annual change in primary energy from nuclear. Statizoid refreshes it automatically from the source and publishes the full history for both places.
Individual pages
About this data
Change in total energy supply relative to the previous year, measured in terawatt-hours.