The world's nuclear fleet in 1965
In 1965, 58 nuclear reactors were operating in 11 countries, 4.7 GWe net, with 42 under construction. 10 of those units are not included in the net capacity because no net figure has been published for them.
Compared with 1964, the operating fleet grew by 12 reactors. 11 reactors were connected to the grid that year, 1,830 MWe, mostly in United Kingdom (6), France (1) and Japan (1). Puerto Rico connected its first nuclear reactor in 1965. The countries with the most operating capacity were United Kingdom (2,559 MWe), United States (865 MWe) and Italy (563 MWe).
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Connected to the grid in 1965
| Unit | Country | Type | Model | MWe |
|---|---|---|---|---|
| Chinon A-2 |  France | GCR | UNGG | 180 |
| Tokai 1 |  Japan | GCR | Magnox | 137 |
| Boiling Nuclear Superheater (BONUS) |  Puerto Rico | BWR | Superheater | 17 |
| Siberian ADE-5 |  Russia | LWGR | unknown | 167 |
| Dungeness A1 |  United Kingdom | GCR | Magnox | 225 |
| Dungeness A2 | United Kingdom | GCR | Magnox | 225 |
| Hinkley Point A1 | United Kingdom | GCR | Magnox | 235 |
| Hinkley Point A2 | United Kingdom | GCR | Magnox | 235 |
| Trawsfynydd 1 | United Kingdom | GCR | Magnox | 195 |
| Trawsfynydd 2 | United Kingdom | GCR | Magnox | 195 |
| Experimental Breeder Reactor 2 |  United States | — | unknown | 19 |
Countries by operating capacity in 1965
| # | Country | Reactors | MWe | Under construction |
|---|---|---|---|---|
| 1 | United Kingdom | 22 | 2,559 | 9 |
| 2 | United States | 14 | 865 | 8 |
| 3 |  Italy | 3 | 563 | — |
| 4 | France | 5 | 329 | 5 |
| 5 | Russia | 8 | 304 | 2 |
| 6 |  Canada | 1 | 22 | 1 |
| 7 | Puerto Rico | 1 | 17 | — |
| 8 |  Germany | 1 | 15 | 7 |
| 9 | Japan | 1 | 12 | 1 |
| 10 |  Belgium | 1 | 10 | — |
| 11 |  Sweden | 1 | 10 | — |
| 12 |  India | 0 | 0 | 3 |
| 13 |  Kazakhstan | 0 | 0 | 1 |
| 14 |  Netherlands | 0 | 0 | 1 |
| 15 |  Slovakia | 0 | 0 | 1 |
| 16 |  Spain | 0 | 0 | 1 |
| 17 |  Switzerland | 0 | 0 | 2 |
Data: Global Energy Monitor (CC BY 4.0), IAEA PRIS 2025, Wikipedia (CC BY-SA), Wikidata and Wikimedia Commons. Capacities in net MWe unless stated.