Table: Japan nuclear operations: Kyushu Elec restarts Genkai No.4, shuts Sendai No.1

Kansai Electric Power Co

22/10/2025 10:24

TOKYO, Oct 22 (Reuters) - Some Japanese utility companies restarted their nuclear reactors shut earlier for maintenance and refuelling, while others have shut some, bringing the total number of reactors in operation in Japan to 11 as of Wednesday, with a combined capacity of 10,647 MW.

Kyushu Electric Power 9508.T restarted the 1,180-megawatt (MW) No.4 reactor at its Genkai nuclear power station in southern Japan on October 17, and shut the 890-MW No.1 reactor at its Sendai nuclear power station the previous day, according to a company spokesperson.

The company plans to reopen the Sendai unit in mid-December.

Kansai Electric Power 9503.T also restarted the 870-MW No.4 reactor at its Takahama nuclear power station in western Japan after scheduled maintenance and refuelling on October 16, its spokesperson said.

Meanwhile, Shikoku Electric Power 9507.T shut the 890-MW No.3 reactor at its Ikata nuclear power station in western Japan on October 11 for planned maintenance and refuelling, with plans to bring it back online in late December, a company spokesperson said.

Many companies are undergoing a re-licensing process to meet stricter safety standards implemented after the 2011 Fukushima disaster. Prior to the disaster, Japan's utility firms operated 54 reactors in total.

The table below shows the status of Japan's nuclear power plants.

The regional utilities are: Chubu Electric Power 9502.T, Chugoku Electric Power 9504.T, Hokkaido Electric Power 9509.T, Hokuriku Electric Power 9505.T, Kansai Electric Power 9503.T, Kyushu Electric Power 9508.T, Shikoku Electric Power 9507.T, Tohoku Electric Power 9506.T and Tokyo Electric Power (Tepco) 9501.T.

In the table, the companies are referred to by their regional names.

Japan Atomic Power Company (Japco), a nuclear energy company, owns two reactors.

Company
Plant
Unit
MW
Status
Hokkaido
Tomari
1
579
Shutdown 22/4/11
Hokkaido
Tomari
2
579
Shutdown 26/8/11
Hokkaido
Tomari
3
912
Shutdown 5/5/12
Tohoku
Onagawa
2
825
Online 5/12/24
Tohoku
Onagawa
3
825
Shutdown 11/3/11
Tohoku
Higashidori
1
1,100
Shutdown 6/2/11
Tepco
Kashiwazaki-Kariwa
1
1,100
Shutdown 6/8/11
Tepco
Kashiwazaki-Kariwa
2
1,100
Shutdown 16/7/07
Tepco
Kashiwazaki-Kariwa
3
1,100
Shutdown 16/7/07
Tepco
Kashiwazaki-Kariwa
4
1,100
Shutdown 16/7/07
Tepco
Kashiwazaki-Kariwa
5
1,100
Shutdown 25/1/12
Tepco
Kashiwazaki-Kariwa
6
1,356
Shutdown 26/3/12
Tepco
Kashiwazaki-Kariwa
7
1,356
Shutdown 23/8/11
Chubu
Hamaoka
3
1,100
Shutdown 29/11/10
Chubu
Hamaoka
4
1,137
Shutdown 13/5/11
Chubu
Hamaoka
5
1,380
Shutdown 14/5/11
Hokuriku
Shika
1
540
Shutdown 1/3/11
Hokuriku
Shika
2
1,206
Shutdown 11/3/11
Kansai
Mihama
3
826
Online 21/5/25
Kansai
Takahama
1
826
Shutdown 6/9/25
Kansai
Takahama
2
826
Online 8/2/25
Kansai
Takahama
3
870
Online 1/6/25
Kansai
Takahama
4
870
Online 16/10/25
Kansai
Ohi
3
1,180
Online 14/8/25
Kansai
Ohi
4
1,180
Online 20/2/25
Chugoku
Shimane
2
820
Online 22/12/24
Shikoku
Ikata
3
890
Shutdown 11/10/25
Kyushu
Genkai
3
1,180
Online 13/6/25
Kyushu
Genkai
4
1,180
Online 17/10/25
Kyushu
Sendai
1
890
Shutdown 16/10/25
Kyushu
Sendai
2
890
Online 28/11/24
Japco
Tokai Daini
1
1,100
Shutdown 11/3/11
Japco
Tsuruga
2
1,160
Shutdown 7/5/11
Total
33,083


 (Reporting by Yuka Obayashi; Editing by Janane Venkatraman)

 ((Yuka.Obayashi@thomsonreuters.com; +813-4520-1265;))