Nuclear Power Plants of Japan

List of nuclear power plants in Japan

• Fukushima-1 (NPP)
• Mihama Nuclear Power Plant

Chronicle

2025

The world's largest nuclear power plant "Kashivazaki Kariva" received approval to restart two reactors

In November 2025, the world's largest nuclear power plant, Kashiwazaki Kariva, in Japan received approval to restart two reactors, an important step for the country in reducing its dependence on gas and coal.

The restart will also reduce LNG demand by about 130,000 tonnes per month.

14 operating nuclear reactors

The number of operating nuclear reactors in countries around the world according to Bloomberg as of February 2025:

• UNITED STATES: 94
• China: 57
• France: 57
• Russia: 36
• South Korea: 26
• India: 20
• Canada: 17
• Ukraine: 15
• Japan: 14
• United Kingdom: 9
• Spain: 7
• Czech Republic: 6
• Pakistan: 6
• Sweden: 6
• Belgium: 5
• Finland: 5
• Slovakia: 5
• Hungary: 4
• Switzerland: 4
• UAE: 4
• Argentina: 3
• Belarus: 2
• Brazil: 2
• Bulgaria: 2
• Mexico: 2
• Romania: 2
• South Africa: 2
• Armenia: 1
• Iran: 1
• Netherlands: 1
• Slovenia: 1

2024: Average capital expenditures for NPP construction

2023

Only 8.5% of Japan's energy mix comes from nuclear power plants

World's largest experimental fusion reactor launched in Japan

On December 1, 2023, the world's largest experimental thermonuclear reactor, the JT-60SA complex, was launched in Japan. The installation is the size of a six-story building located in Naka (Ibaraki Prefecture) north of Tokyo. Read more here.

2022:10 operating reactor plants and a construction plan for new

Japan in December 2022 adopted a plan to extend the life of nuclear reactors, replace old ones and build new ones. After the Fukushima disaster, the country planned to abandon the use of nuclear power, but has now changed this decision amid global interruptions in energy supplies.

Data as of 2022

Notes