Timeline · 1954
The world's nuclear fleet in 1954
In 1954, 2 nuclear reactors were operating in 2 countries, 5 MWe net, with 3 under construction.
One reactor was connected to the grid that year, 5 MWe: Atomic Power Station 1 Obninsk (Russia). Russia connected its first nuclear reactor in 1954. The countries with the most operating capacity were Russia (5 MWe).
That year: Obninsk. First reactor to deliver electricity to a grid, USSR.
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Connected to the grid in 1954
| Unit | Country | Type | Model | MWe |
|---|---|---|---|---|
| Atomic Power Station 1 Obninsk |  Russia | LWGR | AM-1 | 5 |
Countries by operating capacity in 1954
| # | Country | Reactors | MWe | Under construction |
|---|---|---|---|---|
| 1 | Russia | 1 | 5 | — |
| 2 |  United States | 1 | 0 | 1 |
| 3 |  United Kingdom | 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.
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