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Reference data
Page built2026-10-22
Data as ofAugust 2026

Nuclear power in Japan

nuclearchain.net/countries/japan/ · data: Global Energy Monitor (GNPT, August 2026), CC BY 4.0 · printed from the live page

Japan operates 15 nuclear power reactors across 27 sites, with 14.6 GW of gross capacity. A further 2 units are under construction, adding 2.8 GW. 27 units have been retired.

Operating
15
14.6 GW gross
Under construction
2
2.8 GW
Planned
0
incl. 0 announced
Retired
27
10 cancelled
CHINAKashiwazaki Kariwa nuclear power plant: 7 units, 8,212 MWHamaoka nuclear power plant: 6 units, 6,397 MWOhi nuclear power plant: 4 units, 4,710 MWFukushima Daiichi nuclear power plant: 6 units, 4,696 MWTsuruga nuclear power plant: 4 units, 4,593 MWFukushima Daini nuclear power plant: 4 units, 4,400 MWGenkai nuclear power plant: 4 units, 3,478 MWTakahama nuclear power plant: 4 units, 3,392 MWSendai nuclear power plant: 3 units, 3,370 MWHigashidori (Tepco) nuclear power plant: 2 units, 2,770 MWKaminoseki nuclear power plant: 2 units, 2,746 MWShimane nuclear power plant: 3 units, 2,653 MWHigashidori (Tohoku) nuclear power plant: 2 units, 2,485 MWOnagawa nuclear power plant: 3 units, 2,174 MWTomari nuclear power plant: 3 units, 2,070 MWIkata nuclear power plant: 3 units, 2,022 MWShika nuclear power plant: 2 units, 1,746 MWMihama nuclear power plant: 3 units, 1,666 MWOhma nuclear power plant: 1 unit, 1,383 MWTokai nuclear power plant: 2 units, 1,266 MWMonju nuclear power plant: 1 unit, 280 MWFugen nuclear power plant: 1 unit, 165 MWJapan Power Demonstration Reactor nuclear power plant: 1 unit, 13 MW, position approximate500 km
Operating9Under construction1Mothballed7Shelved1Retired5circle area ∝ site capacitydashed = approximate position Coastlines, borders and lakes: Natural Earth (1:10 million, public domain), which is generalised, so a coastal plant can sit a couple of kilometres off its true shoreline. Site positions: Global Nuclear Power Tracker.

Operating fleet by type: PWR (12), BWR (3). Principal operators: Kansai Electric Power, Kyushu Electric Power, Tokyo Electric Power.

Operating capacity over time

First reactor online1965
Peak29.5 GW in 1997
Now14.6 GW 15 units
2026 so far+1.4 GW 1 started
0102030197019801990200020102020GW
Gross capacity of units that had started up and not been permanently shut down by 31 December each year (2026 is to date). Amber marks the peak, green the present. 19 units are left out because they have no date to place on a timeline; mothballed units carry no date for going offline, and a guess would add capacity the record does not support.
Data table
YearUnits onlineGW grossChange, GW
196510.01+0.01
196620.18+0.17
197040.88+0.70
197151.34+0.46
197261.84+0.50
197493.91+2.07
1975115.29+1.39
1976137.43+2.14
1977147.99+0.57
19781710.40+2.41
19792114.02+3.62
19812214.58+0.56
19822416.24+1.67
19842718.76+2.51
19853122.49+3.73
19873223.59+1.10
19913324.77+1.18
19933425.95+1.18
19943628.02+2.07
19953728.30+0.28
19973829.48+1.18
19983729.31−0.17
20033629.15−0.17
20093427.77−1.38
20113024.95−2.81
20132823.07−1.88
20152320.85−2.22
20162220.29−0.57
20172120.01−0.28
20181716.57−3.44
20191211.61−4.96
20241413.25+1.65
20261514.61+1.36

Only years in which capacity changed are listed.

Position in the fuel chain

FacilityStageOperatorCapacity / output
Mutsu Recyclable Fuel Storage Center dry storage Recyclable-Fuel Storage Company 3,000tHM
Rokkasho Enrichment Plant enrichment Japan Nuclear Fuel Limited 150tSWU/yr
Kurihama (GNF-J) fabrication Global Nuclear Fuel 630tHM/yr
Tokai-Mura (Mitsubishi Nuclear Fuel) fabrication Mitsubishi Heavy Industries 440tHM/yr
Kumatori (NFI) fabrication Nuclear Fuel Industries 284tHM/yr
Tokai-Mura (NFI) fabrication Nuclear Fuel Industries 250tHM/yr
J-MOX, Rokkasho fabrication Japan Nuclear Fuel Limited 130tHM/yr
Rokkasho LLW Disposal Center repository Japan Nuclear Fuel Limited not disclosed
Rokkasho Reprocessing Plant reprocessing Japan Nuclear Fuel Limited 800tHM/yr

All units in Japan

UnitSiteStatusTypeGross MWOnline
Genkai nuclear power plant 3 Genkai nuclear power plant Operating PWR 1,180 1994
Genkai nuclear power plant 4 Genkai nuclear power plant Operating PWR 1,180 1997
Ikata nuclear power plant 3 Ikata nuclear power plant Operating PWR 890 1994
Kashiwazaki Kariwa nuclear power plant 6 Kashiwazaki Kariwa nuclear power plant Operating BWR 1,356 2026
Mihama nuclear power plant 3 Mihama nuclear power plant Operating PWR 826 1976
Ohi nuclear power plant 3 Ohi nuclear power plant Operating PWR 1,180 1991
Ohi nuclear power plant 4 Ohi nuclear power plant Operating PWR 1,180 1993
Onagawa nuclear power plant 2 Onagawa nuclear power plant Operating BWR 825 2024
Sendai nuclear power plant 1 Sendai nuclear power plant Operating PWR 890 1984
Sendai nuclear power plant 2 Sendai nuclear power plant Operating PWR 890 1985
Shimane nuclear power plant 2 Shimane nuclear power plant Operating BWR 820 2024
Takahama nuclear power plant 1 Takahama nuclear power plant Operating PWR 826 1974
Takahama nuclear power plant 2 Takahama nuclear power plant Operating PWR 826 1975
Takahama nuclear power plant 3 Takahama nuclear power plant Operating PWR 870 1985
Takahama nuclear power plant 4 Takahama nuclear power plant Operating PWR 870 1985
Ohma nuclear power plant 1 Ohma nuclear power plant Under construction BWR 1,383 2029
Shimane nuclear power plant 3 Shimane nuclear power plant Under construction BWR 1,373 -
Ashihama nuclear power plant 1 Ashihama nuclear power plant Cancelled - 1,300 -
Ashihama nuclear power plant 2 Ashihama nuclear power plant Cancelled - 1,300 -
Fugen nuclear power plant Fugen nuclear power plant Retired PHWR 165 1979
Fukushima Daiichi nuclear power plant 1 Fukushima Daiichi nuclear power plant Retired BWR 460 1971
Fukushima Daiichi nuclear power plant 2 Fukushima Daiichi nuclear power plant Retired BWR 784 1974
Fukushima Daiichi nuclear power plant 3 Fukushima Daiichi nuclear power plant Retired BWR 784 1976
Fukushima Daiichi nuclear power plant 4 Fukushima Daiichi nuclear power plant Retired BWR 784 1978
Fukushima Daiichi nuclear power plant 5 Fukushima Daiichi nuclear power plant Retired BWR 784 1978
Fukushima Daiichi nuclear power plant 6 Fukushima Daiichi nuclear power plant Retired BWR 1,100 1979
Fukushima Daiichi nuclear power plant 7 Fukushima Daiichi nuclear power plant Cancelled BWR 1,380 -
Fukushima Daiichi nuclear power plant 8 Fukushima Daiichi nuclear power plant Cancelled BWR 1,380 -
Fukushima Daini nuclear power plant 1 Fukushima Daini nuclear power plant Retired BWR 1,100 1982
Fukushima Daini nuclear power plant 2 Fukushima Daini nuclear power plant Retired BWR 1,100 1984
Fukushima Daini nuclear power plant 3 Fukushima Daini nuclear power plant Retired BWR 1,100 1985
Fukushima Daini nuclear power plant 4 Fukushima Daini nuclear power plant Retired BWR 1,100 1987
Genkai nuclear power plant 1 Genkai nuclear power plant Retired PWR 559 1975
Genkai nuclear power plant 2 Genkai nuclear power plant Retired PWR 559 1981
Hamaoka nuclear power plant 1 Hamaoka nuclear power plant Retired BWR 540 1976
Hamaoka nuclear power plant 2 Hamaoka nuclear power plant Retired BWR 840 1978
Hamaoka nuclear power plant 3 Hamaoka nuclear power plant Mothballed BWR 1,100 1987
Hamaoka nuclear power plant 4 Hamaoka nuclear power plant Mothballed BWR 1,137 1993
Hamaoka nuclear power plant 5 Hamaoka nuclear power plant Mothballed BWR 1,380 2005
Hamaoka nuclear power plant 6 Hamaoka nuclear power plant Shelved BWR 1,400 -
Higashidori (Tepco) nuclear power plant 1 Higashidori (Tepco) nuclear power plant Mothballed BWR 1,385 -
Higashidori (Tepco) nuclear power plant 2 Higashidori (Tepco) nuclear power plant Shelved BWR 1,385 -
Higashidori (Tohoku) nuclear power plant 1 Higashidori (Tohoku) nuclear power plant Mothballed BWR 1,100 2005
Higashidori (Tohoku) nuclear power plant 2 Higashidori (Tohoku) nuclear power plant Shelved BWR 1,385 -
Hohoku nuclear power plant 1 Hohoku nuclear power plant Cancelled BWR 1,067 -
Hohoku nuclear power plant 2 Hohoku nuclear power plant Cancelled BWR 1,067 -
Ikata nuclear power plant 1 Ikata nuclear power plant Retired PWR 566 1977
Ikata nuclear power plant 2 Ikata nuclear power plant Retired PWR 566 1982
Japan Power Demonstration Reactor nuclear power plant Japan Power Demonstration Reactor nuclear power plant Retired BWR 13 1965
Kaminoseki nuclear power plant 1 Kaminoseki nuclear power plant Shelved BWR 1,373 -
Kaminoseki nuclear power plant 2 Kaminoseki nuclear power plant Shelved BWR 1,373 -
Kashiwazaki Kariwa nuclear power plant 1 Kashiwazaki Kariwa nuclear power plant Mothballed BWR 1,100 1985
Kashiwazaki Kariwa nuclear power plant 2 Kashiwazaki Kariwa nuclear power plant Mothballed BWR 1,100 1990
Kashiwazaki Kariwa nuclear power plant 3 Kashiwazaki Kariwa nuclear power plant Mothballed BWR 1,100 1993
Kashiwazaki Kariwa nuclear power plant 4 Kashiwazaki Kariwa nuclear power plant Mothballed BWR 1,100 1994
Kashiwazaki Kariwa nuclear power plant 5 Kashiwazaki Kariwa nuclear power plant Mothballed BWR 1,100 1990
Kashiwazaki Kariwa nuclear power plant 7 Kashiwazaki Kariwa nuclear power plant Mothballed BWR 1,356 1997
Maki nuclear power plant 1 Maki nuclear power plant Cancelled BWR 780 -
Maki nuclear power plant 2 Maki nuclear power plant Cancelled BWR 1,067 -
Mihama nuclear power plant 1 Mihama nuclear power plant Retired PWR 340 1970
Mihama nuclear power plant 2 Mihama nuclear power plant Retired PWR 500 1972
Monju nuclear power plant Monju nuclear power plant Retired FBR 280 1995
Namie-Odaka nuclear power plant 1 Namie-Odaka nuclear power plant Cancelled BWR 825 -
Ohi nuclear power plant 1 Ohi nuclear power plant Retired PWR 1,175 1979
Ohi nuclear power plant 2 Ohi nuclear power plant Retired PWR 1,175 1979
Ohma nuclear power plant Original Ohma nuclear power plant Cancelled - 600 -
Onagawa nuclear power plant 1 Onagawa nuclear power plant Retired BWR 524 1984
Onagawa nuclear power plant 3 Onagawa nuclear power plant Mothballed BWR 825 2002
Sendai nuclear power plant 3 Sendai nuclear power plant Shelved PWR 1,590 -
Shika nuclear power plant 1 Shika nuclear power plant Mothballed BWR 540 1993
Shika nuclear power plant 2 Shika nuclear power plant Mothballed BWR 1,206 2006
Shimane nuclear power plant 1 Shimane nuclear power plant Retired BWR 460 1974
Tokai nuclear power plant 1 Tokai nuclear power plant Retired GCR 166 1966
Tokai nuclear power plant 2 Tokai nuclear power plant Mothballed BWR 1,100 1978
Tomari nuclear power plant 1 Tomari nuclear power plant Mothballed PWR 579 1989
Tomari nuclear power plant 2 Tomari nuclear power plant Mothballed PWR 579 1991
Tomari nuclear power plant 3 Tomari nuclear power plant Mothballed PWR 912 2009
Tsuruga nuclear power plant 1 Tsuruga nuclear power plant Retired BWR 357 1970
Tsuruga nuclear power plant 2 Tsuruga nuclear power plant Mothballed PWR 1,160 1987
Tsuruga nuclear power plant 3 Tsuruga nuclear power plant Shelved PWR 1,538 -
Tsuruga nuclear power plant 4 Tsuruga nuclear power plant Shelved PWR 1,538 -

More on Japan

Fuel supply exposure

The fuel families Japan's operating reactors take, and the fabricators our sources document as able to make each. This is capability, not contracts: it does not say who actually supplies a given plant.

Fuel familyUnitsGW grossDocumented fabricatorsNote
PWR (square-lattice) fuel1211.6Westinghouse Electric Company, Framatome, KEPCO Nuclear Fuel, China National Nuclear Corporation, ENUSA Industrias Avanzadas, Mitsubishi Heavy Industries
BWR fuel33.0Global Nuclear Fuel, Westinghouse Electric Company, Framatome

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