Ireland vs Japan: Primary energy use by source
Ireland
12.06 terawatt-hours
in 2025
Japan
12.84 terawatt-hours
in 2025
Ireland rank
27th
Japan rank
24th
Primary energy use by source over time
- Ireland
- Japan
How they compare
Japan currently reports 12.84 terawatt-hours against 12.06 terawatt-hours in Ireland, a difference of 0.78 terawatt-hours.
That makes Japan's figure about 1.1 times Ireland's.
The two have swapped places 4 times across 61 shared years of data; in 1965 it was Japan ahead.
Ireland ranks 27th and Japan ranks 24th of 79 countries.
Across the 7 decades both report, Ireland averaged higher in 3 and Japan in 1.
Head to head by decade
| Decade | Ireland | Japan | Difference | Ahead |
|---|---|---|---|---|
| 1960s | 0 terawatt-hours | 0 terawatt-hours | 0 terawatt-hours | — |
| 1970s | 0 terawatt-hours | 0 terawatt-hours | 0 terawatt-hours | — |
| 1980s | 0 terawatt-hours | 0 terawatt-hours | 0 terawatt-hours | — |
| 1990s | 0.0475 terawatt-hours | 0.0049 terawatt-hours | 0.0426 terawatt-hours | Ireland |
| 2000s | 1.23 terawatt-hours | 1.62 terawatt-hours | 0.3948 terawatt-hours | Japan |
| 2010s | 6.07 terawatt-hours | 5.49 terawatt-hours | 0.583 terawatt-hours | Ireland |
| 2020s | 11.44 terawatt-hours | 10.2 terawatt-hours | 1.24 terawatt-hours | Ireland |
Averages of every year both report within each decade.
Frequently asked questions
- Which has higher primary energy use by source, Ireland or Japan?
- Japan, at 12.84 terawatt-hours against 12.06 terawatt-hours in Ireland as of 2025.
- What is the difference in primary energy use by source between Ireland and Japan?
- 0.78 terawatt-hours, with Japan ahead.
- How many years of comparable data are there for Ireland and Japan?
- 61 years are reported by both, from 1965 to 2025.
- How do Ireland and Japan rank globally for primary energy use by source?
- Ireland ranks 27th and Japan ranks 24th 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.