The world's nuclear fleet in 1961

In 1961, 23 nuclear reactors were operating in 4 countries, 1.2 GWe net, with 44 under construction.

Compared with 1960, the operating fleet grew by 3 reactors. One reactor was connected to the grid that year, 167 MWe: Siberian ADE-3 (Russia). The countries with the most operating capacity were United States (458 MWe), United Kingdom (422 MWe) and Russia (272 MWe).

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Connected to the grid in 1961

Unit	Country	Type	Model	MWe
Siberian ADE-3	Russia	LWGR	unknown	167

Countries by operating capacity in 1961

#	Country	Reactors	MWe	Under construction
1	United States	8	458	9
2	United Kingdom	8	422	16
3	Russia	4	272	2
4	France	3	86	3
5	Belgium	0	0	1
6	Canada	0	0	2
7	Germany	0	0	4
8	Italy	0	0	3
9	Japan	0	0	2
10	Slovakia	0	0	1
11	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.

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