Countries With the Most Nuclear Reactors in Operation 2026
Key Findings
🏆
United States leads in Reactors in Operation with 94 in 2026.
📊
Average Reactors in Operation in 2026: 27.21 · median: 17.
↔️
Gap in 2026: United States is 15.7× larger than Czechia.
About This Dataset
Countries With the Most Nuclear Reactors in Operation 2026
Power reactors connected to the grid and available for operation in 2026, as recorded by the IAEA. Units in long-term shutdown are counted separately by the agency and are excluded here, which is why Japan appears well below the fleet size it had before 2011.
Analysis
The United States operates 94 of the 427 power reactors running worldwide, 22.0% of the global fleet and 1.5 times the 64 of China. The 14 countries here run 381 reactors, 89.2% of the world total. 9 of them are also building new units, led by China with 37. The smallest fleet on the chart belongs to Czechia with 6.
Data Insights
Numbers, trends & sources behind this chart
Methodology & source
- Data source
- IAEA Power Reactor Information System, via Wikipedia
- Coverage
- 14 entities · 2026 · 14 observations
- Measure
- Reactors in Operation
- Last updated
- 7 September 2026
- Compiled by
- The ANYSTAT team, from the source above
How the figures are calculated
- Values use the measure and unit named on this page. Consult the dataset description and cited source for coverage, definitions and any unit conversions. Displayed values may be rounded for readability.
- Entities are ranked highest-first on their value in 2026.
Data Sources & References
All external sources cited in this dataset
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