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Japan
Abandoned Constructions
2
Operating
15
Long-Term Outage
18
Closed
27
Number of Reactors
(as of August 2026)
39.2
Mean Age of Reactor Fleet
(as of August 2026)
9.2%
Stable
Nuclear Share in Electricity Production
(2025)
1
2
3
WNISR
Essential News –
20 June 2018
Genkai-4 Reconnected to Japanese Grid After 6.5-Year Outage
Genkai-4 Reconnected to Japanese Grid After 6.5-Year Outage
WNISR
, 20 June 2018 The Genkai-4
PWR
was reconnected to the grid 20 June 2018, six and a half years after it shut down in December 2011. The 1180 MWe reactor, owned by the Kyushu Electric Power Company, is located in Genkai town, Saga Prefecture in southern Kyushu. Restart of the Genkai reactor had been delayed by two months due to the Kobe Steel scandal, where parts supplied to Kyushu Electric, amongst many others, were (…)
WNISR
Essential News –
13 May 2018
Ohi-4, Down Since 2013, Finally Reconnected to the Japanese Grid
Ohi-4, Down Since 2013, Finally Reconnected to the Japanese Grid
WNISR
, 12 May 2018 The Ohi unit 4 reactor was reconnected to the grid 11 May 2018, plant owner Kansai Electric Power Company (
KEPCO
) announced. The reactor, located on Wakasa bay, Fukui Prefecture in western Japan, last operated on 14 September 2013.
KEPCO
had planned to restart in March 2018, but had to delay for two months due to the need for inspections following the disclosure of data falsifications on products supplied (…)
WNISR
in the Media –
12 April 2018
Christian Science Monitor (
US
)
How Fukushima turned a nuclear advocate into an antinuclear champion
A Shift in Thought
Naoto Kan, Japan’s former prime minister, was devoted to the idea of nuclear power. But after his country’s nuclear disaster in 2011, he turned into an improbable activist against atomic energy. Can he persuade the pro-nuke French? Clare Kittredge Contributor Naoto Kan came to France anyway. The once pro-nuclear former prime minister who led Japan through the Fukushima nuclear disaster recently made a swing through one of France’s most nuclearized areas – the tip of Normandy – giving (…)
WNISR
Essential News –
27 March 2018
Permanent Closure of Ikata-2 Brings Total Shutdowns to One Third of Pre-Fukushima Capacity in Japan
Permanent Closure of Ikata-2 Brings Total Shutdowns to One Third of Pre-Fukushima Capacity in Japan
WNISR
, 27 March 2018 Only two days after Kyushu Electric’s restart announcement for Genkai-3, on 27 March 2018, Shikoku Electric Power Company announced that its Board of Directors had taken the decision for the permanent shutdown of the Ikata-2 reactor. The 538
MW
Pressurized Water Reactor (
PWR
), located in Ehime Prefecture on the island of Shikoku, was connected to the grid on 19 August (…)
WNISR
Essential News –
26 March 2018
Japan: Genkai-3 Restarted After 7-Year Outage
Japan: Genkai-3 Restarted After 8-Year Outage
WNISR
, 26 March 2018 Genkai-3 was reconnected to the grid 25 March 2018, more than seven years after it shut down in December 2010. The 1180 MWe Pressurized Water Reactor (
PWR
), owned by the Kyushu Electric Power Company, is located in Genkai town, Saga Prefecture in southern Kyushu. Restart of the Genkai reactor had been delayed by two months due to the Kobe Steel scandal, where parts supplied to Kyushu Electric were required to be checked (…)
WNISR
Essential News –
17 March 2018
Japan: Ohi-3 Restarted After 4.5-Year Outage
Japan: Ohi-3 Restarted After 4.5-Year Outage
WNISR
, 17 March 2018 On 16 March 2018, Japanese utility Kansai Electric Power Company (
KEPCO
) reconnected its reactor Ohi-3 to the grid, four and a half years after it was shut down on 2 September 2013.
KEPCO
plans to restart Ohi-4 in mid May 2018. The Ohi nuclear plant has been the subject of multiple lawsuits since its shutdown.
KEPCO
submitted its applications to the Nuclear Regulation Authority (
NRA
) for safety examinations of Ohi-3 and -4 (…)
WNISR
in the Media –
4 February 2018
The Independent (
UK
)
Fukushima nuclear disaster: Lethal levels of radiation detected in leak seven years after plant meltdown in Japan
Expert warns of ’global’ consequences unless the plant is treated properly The Independent Jeff Farrell Friday 2 February 2018 14:23
GMT
Lethal levels of radiation have been detected at Japan’s Fukushima nuclear power plant, seven years after it was destroyed by an earthquake and tsunami. The Tokyo Electric Power Company (Tepco), which operated the complex and is now responsible for its clean up, made the discovery in a reactor containment vessel last month. The energy firm found (…)
WNISR
Essential News –
10 June 2017
Fifth Reactor Operating in Japan with Grid Connection of Takahama-3
Fifth Reactor Operating in Japan with Grid Connection of Takahama-3 World Nuclear Industry Status Report (
WNISR
), 10 June 1017 The Takahama-3 reactor was connected to the grid on 9 June 2017. The restart of the 33-year old 830
MW
Pressurized Water Reactor (
PWR
), owned by Kansai Electric Power Company (
KEPCO
) and located on Takahama Bay in Fukui Prefecture in western Japan, follows a ruling on 28 March 2017 by the Osaka High Court that overturned an injunction against operation of the (…)
WNISR
Essential News –
22 May 2017
Takahama-4 Restart in Japan After Court Injunction Was Overturned
Takahama-4 Restart in Japan After Court Injunction Was Overturned World Nuclear Industry Status Report (
WNISR
), 22 May 2017 The Takahama-4 reactor was connected to the grid on 22 May 2017. The restart of the 33-year old 880
MW
Pressurized Water Reactor (
PWR
), owned by Kansai Electric Power Company (
KEPCO
) and located on Takahama Bay in Fukui Prefecture in western Japan, follows a ruling on 28 March 2017 by the Osaka High Court that overturned an injunction against operation of the (…)
WNISR
Essential News –
21 February 2012
Only Two Reactors Operating in Japan
Japan. At midnight on 20 February 2012, the Takahama-3 reactor in Fukui Prefecture was shut down for regular inspection and refueling. That leaves Japan with only 2 of its 54 commercial reactors operating. The Kashiwasaki-6 reactor in Niigata prefecture is scheduled to be taken off the grid on 26 March and the Tomari-3 unit in Hokkaido is expected to shut down by late April 2012. Restart of any of the idled reactors has so far been prevented by local authorities and an increasingly vocal (…)
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