Timeline · 2021
The world's nuclear fleet in 2021
In 2021, 434 nuclear reactors were operating in 34 countries, 387.3 GWe net, with 59 under construction.
Compared with 2020, the operating fleet shrank by 3 reactors. 6 reactors were connected to the grid that year, 5,255 MWe, mostly in China (3), India (1) and Pakistan (1). 10 units were permanently shut down, 8,668 MWe. The countries with the most operating capacity were United States (95,523 MWe), France (61,370 MWe) and China (49,950 MWe).
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Connected to the grid in 2021
| Unit | Country | Type | Model | MWe |
|---|---|---|---|---|
| Hongyanhe 2-5 |  China | PWR | ACPR-1000 | 1,061 |
| Shidao Bay 1 | China | HTGR | HTR-PM | 150 |
| Tianwan 3-6 | China | PWR | CNP-1000 (CNNC) (CNP-1000) | 1,060 |
| Kakrapar 3 |  India | PHWR | IPHWR-700 | 630 |
| Karachi 2 |  Pakistan | PWR | ACP1000 | 1,017 |
| Barakah 2 |  United Arab Emirates | PWR | APR-1400 | 1,337 |
Shut down in 2021
| Unit | Country | Type | Model | MWe | Grid connection |
|---|---|---|---|---|---|
| Brokdorf |  Germany | PWR | Siemens-KWU (KWU) | 1,410 | 1986 |
| Grohnde | Germany | PWR | Siemens-KWU (KWU) | 1,360 | 1984 |
| Gundremmingen C | Germany | BWR | KWU BWR, '72 design line (BWR-72) | 1,288 | 1984 |
| Karachi 1 | Pakistan | PHWR | CANDU (KANUPP) (CANDU-137 MW) | 90 | 1971 |
| Kursk 1-1 |  Russia | LWGR | RBMK-1000 | 925 | 1976 |
| Kuosheng 1 |  Taiwan | BWR | BWR-6 | 985 | 1981 |
| Dungeness B1 |  United Kingdom | GCR | AGR | 545 | 1983 |
| Dungeness B2 | United Kingdom | GCR | AGR | 545 | 1985 |
| Hunterston B1 | United Kingdom | GCR | AGR | 490 | 1976 |
| Indian Point 3 |  United States | PWR | Westinghouse 4-loop (WH 4LP) | 1,030 | 1976 |
Countries by operating capacity in 2021
| # | Country | Reactors | MWe | Under construction |
|---|---|---|---|---|
| 1 | United States | 93 | 95,523 | 2 |
| 2 |  France | 56 | 61,370 | 1 |
| 3 | China | 51 | 49,950 | 18 |
| 4 |  Japan | 33 | 31,679 | 2 |
| 5 | Russia | 37 | 27,727 | 3 |
| 6 |  South Korea | 24 | 22,764 | 4 |
| 7 |  Canada | 19 | 13,744 | — |
| 8 |  Ukraine | 15 | 13,107 | 2 |
| 9 | United Kingdom | 12 | 7,343 | 2 |
| 10 |  Spain | 7 | 7,123 | — |
| 11 |  Sweden | 6 | 7,012 | — |
| 12 | India | 21 | 6,157 | 9 |
| 13 |  Belgium | 7 | 5,922 | — |
| 14 | Germany | 3 | 4,055 | — |
| 15 |  Czech Republic | 6 | 3,972 | — |
| 16 |  Switzerland | 4 | 2,973 | — |
| 17 | Taiwan | 3 | 2,859 | — |
| 18 |  Finland | 4 | 2,794 | 1 |
| 19 | Pakistan | 5 | 2,245 | 1 |
| 20 |  Bulgaria | 2 | 2,006 | — |
| 21 |  Hungary | 4 | 1,916 | — |
| 22 |  Brazil | 2 | 1,884 | 1 |
| 23 |  Slovakia | 4 | 1,868 | 2 |
| 24 |  South Africa | 2 | 1,854 | — |
| 25 |  Argentina | 3 | 1,631 | 1 |
| 26 |  Mexico | 2 | 1,552 | — |
| 27 | United Arab Emirates | 1 | 1,337 | 3 |
| 28 |  Romania | 2 | 1,300 | — |
| 29 |  Belarus | 1 | 1,110 | 1 |
| 30 |  Iran | 1 | 915 | 1 |
| 31 |  Slovenia | 1 | 696 | — |
| 32 |  Netherlands | 1 | 482 | — |
| 33 |  Armenia | 1 | 416 | — |
| 34 |  North Korea | 1 | 5 | — |
| 35 |  Bangladesh | 0 | 0 | 2 |
| 36 |  Philippines | 0 | 0 | — |
| 37 |  Türkiye | 0 | 0 | 3 |
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.