Timeline · 1955
The world's nuclear fleet in 1955
In 1955, 3 nuclear reactors were operating in 2 countries, 5 MWe net, with 11 under construction. 2 of those units are not included in the net capacity because no net figure has been published for them.
Compared with 1954, the operating fleet grew by 1 reactor. One reactor was connected to the grid that year, 50 MWe: Siberian I-1 (Russia). The countries with the most operating capacity were Russia (5 MWe).
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Connected to the grid in 1955
| Unit | Country | Type | Model | MWe |
|---|---|---|---|---|
| Siberian I-1 |  Russia | LWGR | unknown | 50 |
Countries by operating capacity in 1955
| # | Country | Reactors | MWe | Under construction |
|---|---|---|---|---|
| 1 | Russia | 2 | 5 | — |
| 2 |  France | 0 | 0 | 1 |
| 3 |  United Kingdom | 0 | 0 | 9 |
| 4 |  United States | 1 | 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.