Timeline · 1958
The world's nuclear fleet in 1958
In 1958, 12 nuclear reactors were operating in 4 countries, 239 MWe net, with 30 under construction. 6 of those units are not included in the net capacity because no net figure has been published for them.
Compared with 1957, the operating fleet grew by 3 reactors. 2 reactors were connected to the grid that year, 100 MWe: Siberian EI-2 (Russia) and Calder Hall 3 (United Kingdom). The countries with the most operating capacity were United Kingdom (150 MWe), United States (84 MWe) and Russia (5 MWe).
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Connected to the grid in 1958
| Unit | Country | Type | Model | MWe |
|---|---|---|---|---|
| Siberian EI-2 |  Russia | LWGR | unknown | 50 |
| Calder Hall 3 |  United Kingdom | GCR | Magnox | 50 |
Countries by operating capacity in 1958
| # | Country | Reactors | MWe | Under construction |
|---|---|---|---|---|
| 1 | United Kingdom | 3 | 150 | 15 |
| 2 |  United States | 5 | 84 | 4 |
| 3 | Russia | 3 | 5 | 2 |
| 4 |  Belgium | 0 | 0 | 1 |
| 5 |  Canada | 0 | 0 | 1 |
| 6 |  France | 1 | 0 | 3 |
| 7 |  Germany | 0 | 0 | 1 |
| 8 |  Italy | 0 | 0 | 1 |
| 9 |  Slovakia | 0 | 0 | 1 |
| 10 |  Sweden | 0 | 0 | 1 |
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.