Japan vs Viet Nam: Hydropower generation by region
Japan
74.25 terawatt-hours
in 2025
Viet Nam
101.83 terawatt-hours
in 2025
Japan rank
10th
Viet Nam rank
9th
Hydropower generation by region over time
- Japan
- Viet Nam
How they compare
Viet Nam currently reports 101.83 terawatt-hours against 74.25 terawatt-hours in Japan, a difference of 27.58 terawatt-hours.
That makes Viet Nam's figure about 1.4 times Japan's.
The two have swapped places 3 times across 61 shared years of data; in 1965 it was Japan ahead.
Japan ranks 10th and Viet Nam ranks 9th of 80 countries.
Across the 7 decades both report, Japan averaged higher in 6 and Viet Nam in 1.
Head to head by decade
| Decade | Japan | Viet Nam | Difference | Ahead |
|---|---|---|---|---|
| 1960s | 74.55 terawatt-hours | 0.436 terawatt-hours | 74.12 terawatt-hours | Japan |
| 1970s | 78.49 terawatt-hours | 0.5933 terawatt-hours | 77.9 terawatt-hours | Japan |
| 1980s | 83.39 terawatt-hours | 1.73 terawatt-hours | 81.66 terawatt-hours | Japan |
| 1990s | 83.37 terawatt-hours | 9.52 terawatt-hours | 73.84 terawatt-hours | Japan |
| 2000s | 81.73 terawatt-hours | 20.24 terawatt-hours | 61.48 terawatt-hours | Japan |
| 2010s | 80.85 terawatt-hours | 59.81 terawatt-hours | 21.04 terawatt-hours | Japan |
| 2020s | 76.85 terawatt-hours | 86.44 terawatt-hours | 9.59 terawatt-hours | Viet Nam |
Averages of every year both report within each decade.
Frequently asked questions
- Which has higher hydropower generation by region, Japan or Viet Nam?
- Viet Nam, at 101.83 terawatt-hours against 74.25 terawatt-hours in Japan as of 2025.
- What is the difference in hydropower generation by region between Japan and Viet Nam?
- 27.58 terawatt-hours, with Viet Nam ahead.
- How many years of comparable data are there for Japan and Viet Nam?
- 61 years are reported by both, from 1965 to 2025.
- How do Japan and Viet Nam rank globally for hydropower generation by region?
- Japan ranks 10th and Viet Nam ranks 9th of 80 countries.
- Where does this data come from?
- Energy Institute - Statistical Review of World Energy (2026) β with major processing by Our World in Data, published as Hydropower generation by region. Statizoid refreshes it automatically from the source and publishes the full history for both places.
Individual pages
About this data
Figures are based on gross primary hydroelectric generation and do not account for cross-border electricity supply.