Table: Japan nuclear operations: Kansai Electric restarts Mihama No.3 reactor after replacing pipe

Hokuriku Electric Power

16/10/2026 09:55

TOKYO, Oct 16 (Reuters) - Kansai Electric Power 9503.T restarted its 826-megawatt No. 3 reactor at the Mihama nuclear power station in western Japan on October 10 after replacing a pipe that had developed a hole due to external corrosion, a company spokesperson said on Friday. 
The reactor was manually shut down on September 18 for safety checks after water droplets were detected in a high-pressure turbine feedwater heater. 
The company replaced the corroded pipe with a stainless steel pipe and also replaced its cover and insulation.
As of Friday, Japan has 12 opreational nuclear reactors, with a combined capacity of 11,379 MW.
Many utilities are undergoing re-licensing to meet stricter safety standards implemented after the 2011 Fukushima disaster. Before the disaster, Japan operated a total of 54 reactors.    
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 18/5/26
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
Online 9/2/26
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 10/10/26
Kansai
Takahama
1
826
Online 30/11/25
Kansai
Takahama
2
826
Online 19/6/26
Kansai
Takahama
3
870
Shutdown 7/4/26
Kansai
Takahama
4
870
Online 16/10/25
Kansai
Ohi
3
1,180
Shutdown 8/8/26
Kansai
Ohi
4
1,180
Online 26/5/26
Chugoku
Shimane
2
820
Online 13/8/26
Shikoku
Ikata
3
890
Online 25/12/25 
Kyushu
Genkai
3
1,180
Shutdown 30/6/26
Kyushu
Genkai
4
1,180
Online 17/10/25
Kyushu
Sendai
1
890
Online 21/12/25
Kyushu
Sendai
2
890
Online 28/3/26
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 Tasim Zahid)
 ((Yuka.Obayashi@thomsonreuters.com; +813-4520-1265;))