The world's nuclear fleet in 2023
In 2023, 437 nuclear reactors were operating in 33 countries, 390.8 GWe net, with 61 under construction. One of those units is not included in the net capacity because no net figure has been published for it.
Compared with 2022, the operating fleet grew by 3 reactors. 6 reactors were connected to the grid that year, 5,111 MWe, mostly in Belarus (1), China (1) and North Korea (1). 5 units were permanently shut down, 6,048 MWe. The countries with the most operating capacity were United States (95,835 MWe), France (61,370 MWe) and China (53,236 MWe).
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Connected to the grid in 2023
| Unit | Country | Type | Model | MWe |
|---|---|---|---|---|
| Astravets 2 |  Belarus | PWR | VVER-1200 (V-491) | 1,110 |
| Fangchenggang 2-3 |  China | PWR | Hualong One (HPR1000) | 1,000 |
| Nyongbyon 3 |  North Korea | LWGR | unknown | 30 |
| Mochovce 3 |  Slovakia | PWR | VVER-440 (V-213) | 438 |
| Shin-Hanul 2 |  South Korea | PWR | APR-1400 | 1,416 |
| Alvin W Vogtle 3 |  United States | PWR | AP1000 | 1,117 |
Shut down in 2023
| Unit | Country | Type | Model | MWe | Grid connection |
|---|---|---|---|---|---|
| Tihange 2 |  Belgium | PWR | Westinghouse 3-loop (WH 3LP) | 1,008 | 1982 |
| Emsland |  Germany | PWR | Konvoi (Siemens-KWU) (Konvoi) | 1,335 | 1988 |
| Isar 2 | Germany | PWR | Konvoi (Siemens-KWU) (Konvoi) | 1,410 | 1988 |
| Neckarwestheim 2 | Germany | PWR | Konvoi (Siemens-KWU) (Konvoi) | 1,310 | 1989 |
| Kuosheng 2 |  Taiwan | BWR | BWR-6 | 985 | 1982 |
Countries by operating capacity in 2023
| # | Country | Reactors | MWe | Under construction |
|---|---|---|---|---|
| 1 | United States | 93 | 95,835 | 1 |
| 2 |  France | 56 | 61,370 | 1 |
| 3 | China | 55 | 53,236 | 24 |
| 4 |  Japan | 33 | 31,679 | 2 |
| 5 |  Russia | 37 | 27,727 | 3 |
| 6 | South Korea | 25 | 24,193 | 3 |
| 7 |  Canada | 19 | 13,744 | — |
| 8 |  Ukraine | 15 | 13,107 | 2 |
| 9 |  Spain | 7 | 7,123 | — |
| 10 |  Sweden | 6 | 7,012 | — |
| 11 |  India | 22 | 6,787 | 8 |
| 12 |  United Kingdom | 9 | 5,883 | 2 |
| 13 |  Finland | 5 | 4,369 | — |
| 14 |  United Arab Emirates | 3 | 4,011 | 1 |
| 15 |  Czech Republic | 6 | 3,972 | — |
| 16 | Belgium | 5 | 3,908 | — |
| 17 |  Pakistan | 6 | 3,262 | — |
| 18 |  Switzerland | 4 | 2,973 | — |
| 19 | Belarus | 2 | 2,220 | — |
| 20 |  Bulgaria | 2 | 2,006 | — |
| 21 |  Hungary | 4 | 1,916 | — |
| 22 |  Brazil | 2 | 1,884 | 1 |
| 23 | Taiwan | 2 | 1,874 | — |
| 24 | Slovakia | 4 | 1,868 | 2 |
| 25 |  South Africa | 2 | 1,854 | — |
| 26 |  Argentina | 3 | 1,631 | 1 |
| 27 |  Mexico | 2 | 1,552 | — |
| 28 |  Romania | 2 | 1,300 | — |
| 29 |  Iran | 1 | 915 | 1 |
| 30 |  Slovenia | 1 | 696 | — |
| 31 |  Netherlands | 1 | 482 | — |
| 32 |  Armenia | 1 | 416 | — |
| 33 | North Korea | 2 | 5 | — |
| 34 |  Bangladesh | 0 | 0 | 2 |
| 35 |  Egypt | 0 | 0 | 3 |
| 36 |  Philippines | 0 | 0 | — |
| 37 |  Türkiye | 0 | 0 | 4 |
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.