Nuclear reactors supplied by Hitachi

Hitachi is recorded as the nuclear steam supply system (NSSS) supplier of 13 units in 1 country, per the IAEA PRIS register: 6 operating with 5,851 MWe net, 2 under construction and 5 shut down.

Japan's other boiling water reactor supplier; today GE's partner in GE Hitachi. By country: Japan (13). By technology: 12 BWR and 1 HWLWR. The first unit was connected in 1973 and the most recent in 2005. The most powerful unit in operation is Kashiwazaki Kariwa 7, in Japan, with 1,315 MWe. 2 units are under construction: Ohma 1 (Japan) and Shimane 3 (Japan). 5 units have been permanently shut down.

PRIS supplier codes: HITACHI, H/G · Reference · Names per IAEA, Nuclear Power Reactors in the World 2025, table 25

Units with a Hitachi nuclear steam supply system

Unit	Country	Type	Model	MWe	Grid connection	Status
Shimane 1	Japan	BWR	BWR-3	439	1973	Shut down
Fugen	Japan	HWLWR	ATR	148	1978	Shut down
Fukushima Daiichi 4	Japan	BWR	BWR-4	760	1978	Shut down
Fukushima Daini 2	Japan	BWR	BWR-5	1,067	1983	Shut down
Fukushima Daini 4	Japan	BWR	BWR-5	1,067	1986	Shut down
Shimane 2	Japan	BWR	BWR-5	789	1988	Operating
Kashiwazaki Kariwa 5	Japan	BWR	BWR-5	1,067	1989	Operation suspended
Kashiwazaki Kariwa 4	Japan	BWR	BWR-5	1,067	1993	Operation suspended
Shika 1	Japan	BWR	BWR-5	505	1993	Operation suspended
Kashiwazaki Kariwa 7	Japan	BWR	ABWR	1,315	1996	Operation suspended
Shika 2	Japan	BWR	ABWR	1,108	2005	Operation suspended
Ohma 1	Japan	BWR	ABWR	1,328	2029	Under construction
Shimane 3	Japan	BWR	ABWR	1,325	—	Under construction

Data: Global Energy Monitor (CC BY 4.0), IAEA PRIS 2025, Wikipedia (CC BY-SA), Wikidata and Wikimedia Commons. Capacities in net MWe unless stated.

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