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Japan

Total projects
4
Under construction
0
Companies
3
Upcoming reg. events
0

Nuclear overview

Japan has 4 SMR projects tracked on SMR Brief Pro, ranging from Planning to Operational.

Nuclear Readiness Score

7.5/10
Regulatory: 8Political: 7Grid: 8Public: 6Financing: 7Experience: 9

Japan possesses strong regulatory and grid infrastructure, coupled with extensive nuclear experience. While political commitment is growing, public acceptance remains a significant hurdle, impacting financing and overall SMR deployment speed.

Score updated Jun 22, 2026

Projects in Japan

Mitsubishi DMS — Japan
Mitsubishi Heavy Industries
Planning
300 MWe
X-energy — IHI Corporation Japan Supply Chain Programme
X-energy / IHI Corporation
Planning
0 MWe
TEPCO Kashiwazaki-Kariwa Unit 7 — Delayed Restart 2029-2030
Tokyo Electric Power Company (TEPCO)
Planning
1356 MWe
Japan Kashiwazaki-Kariwa Unit 6 Restart — TEPCO First Post-Fukushima
Tokyo Electric Power Company (TEPCO)
Operational
1356 MWe

Companies headquartered in Japan

IHI Corporation
Tokyo, Japan
HTGR
Kyoto Fusioneering
Kyoto, Japan
MSR
Tokyo Electric Power Company (TEPCO)
Tokyo, Japan
BWR

SMR Brief Pro members also see:

  • Regulatory Calendar for Japan
  • Funding & Grants available in Japan
  • Deals involving Japan
  • Country Readiness Score

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Track every SMR project in Japan with SMR Brief Pro