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 of those units is not included in the net capacity because no net figure has been published for it.
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.
Next year, 1955 → · See this year on the map · Today's rankings
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 Kingdom | 0 | 0 | 2 |
| 3 |  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.