The world's nuclear fleet in 1977
In 1977, 199 nuclear reactors were operating in 22 countries, 92.8 GWe net, with 190 under construction.
Compared with 1976, the operating fleet grew by 13 reactors. 18 reactors were connected to the grid that year, 13,200 MWe, mostly in Japan (3), United States (3) and Canada (2). 5 units were permanently shut down, 774 MWe. Finland, South Korea, Taiwan and Ukraine connected their first nuclear reactor in 1977. The countries with the most operating capacity were United States (48,403 MWe), Japan (7,587 MWe) and Germany (6,542 MWe).
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Connected to the grid in 1977
| Unit | Country | Type | Model | MWe |
|---|---|---|---|---|
| Bruce A1 |  Canada | PHWR | CANDU 791 | 816 |
| Bruce A3 | Canada | PHWR | CANDU 750A | 770 |
| Loviisa 1 |  Finland | PWR | VVER-440/V-213 | 507 |
| Fessenheim 1 |  France | PWR | CP0 | 880 |
| Fessenheim 2 | France | PWR | CP0 | 880 |
| Greifswald 3 |  Germany | PWR | VVER-440/V-230 | 408 |
| Isar 1 | Germany | BWR | BWR-69 | 878 |
| Fukushima Daiichi 5 |  Japan | BWR | BWR-4 | 760 |
| Ikata 1 | Japan | PWR | Mitsubishi (2-loop) | 538 |
| Ohi 1 | Japan | PWR | W (4-loop) | 1,120 |
| Kori 1 |  South Korea | PWR | WH 60 | 576 |
| Barseback 2 |  Sweden | BWR | ASEA-II | 600 |
| Jinshan 1 |  Taiwan | BWR | BWR-4 | 604 |
| Chernobyl 1 |  Ukraine | LWGR | RBMK-1000 | 740 |
| Hunterston B2 |  United Kingdom | GCR | AGR | 495 |
| Crystal River 3 |  United States | PWR | B&W LLP (DRYAMB) | 860 |
| Davis Besse 1 | United States | PWR | B & W (DRY) | 894 |
| Joseph M Farley 1 | United States | PWR | WH 3-Loop (DRY) | 874 |
Shut down in 1977
| Unit | Country | Type | Model | MWe | Grid connection |
|---|---|---|---|---|---|
| Gentilly 1 | Canada | HWLWR | CANDU BLWR 250 | 250 | 1971 |
| Gundremmingen A | Germany | BWR | GE, BWR-1 | 237 | 1966 |
| Lingen | Germany | BWR | BWR | 183 | 1968 |
| Bohunice A1 |  Slovakia | HWGCR | KS 150 | 93 | 1972 |
| Dounreay DFR | United Kingdom | FBR | unknown | 11 | 1962 |
Countries by operating capacity in 1977
| # | Country | Reactors | MWe | Under construction |
|---|---|---|---|---|
| 1 | United States | 67 | 48,403 | 58 |
| 2 | Japan | 14 | 7,587 | 10 |
| 3 | Germany | 13 | 6,542 | 16 |
| 4 | United Kingdom | 32 | 6,203 | 7 |
| 5 |  Russia | 21 | 5,798 | 10 |
| 6 | Sweden | 6 | 4,044 | 4 |
| 7 | Canada | 8 | 3,921 | 8 |
| 8 | France | 11 | 2,526 | 26 |
| 9 |  Belgium | 4 | 1,862 | 2 |
| 10 |  Switzerland | 3 | 1,103 | 2 |
| 11 |  Spain | 3 | 1,067 | 5 |
| 12 |  Bulgaria | 2 | 816 | 2 |
| 13 |  Italy | 3 | 563 | 1 |
| 14 |  Netherlands | 2 | 537 | — |
| 15 | Finland | 1 | 507 | 3 |
| 16 |  India | 3 | 434 | 5 |
| 17 |  Armenia | 1 | 376 | 1 |
| 18 |  Argentina | 1 | 340 | 1 |
| 19 |  Pakistan | 1 | 90 | — |
| 20 |  Kazakhstan | 1 | 52 | — |
| 21 | Puerto Rico | 1 | 18 | — |
| 22 | Panama | 1 | 10 | — |
| 23 |  Brazil | 0 | 0 | 2 |
| 24 |  Hungary | 0 | 0 | 2 |
| 25 |  Iran | 0 | 0 | 1 |
| 26 |  Lithuania | 0 | 0 | 1 |
| 27 |  Mexico | 0 | 0 | 2 |
| 28 |  Philippines | 0 | 0 | 1 |
| 29 | Slovakia | 0 | 0 | 4 |
| 30 |  Slovenia | 0 | 0 | 1 |
| 31 |  South Africa | 0 | 0 | 2 |
| 32 | South Korea | 0 | 0 | 3 |
| 33 | Taiwan | 0 | 0 | 4 |
| 34 | Ukraine | 0 | 0 | 6 |
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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