Nuclear reactors supplied by ASEA-Atom / ABB Atom

ASEA-Atom / ABB Atom is recorded as the nuclear steam supply system (NSSS) supplier of 12 units in 2 countries, per the IAEA PRIS register: 6 operating with 6,577 MWe net and 6 shut down.

Sweden's and Finland's home-designed boiling water reactors. By country: Sweden (10) and Finland (2). By technology: 11 BWR and 1 PHWR. The first unit was connected in 1964 and the most recent in 1985. The most powerful unit in operation is Oskarshamn 3, in Sweden, with 1,400 MWe. 6 units have been permanently shut down.

PRIS supplier codes: ABB ATOM, ASEASTAL · Reference · Names per IAEA, Nuclear Power Reactors in the World 2025, table 25

Units with a ASEA-Atom / ABB Atom nuclear steam supply system

Unit	Country	Type	Model	MWe	Grid connection	Status
Agesta	Sweden	PHWR	R3	10	1964	Shut down
Oskarshamn 1	Sweden	BWR	ASEA-I	473	1971	Shut down
Oskarshamn 2	Sweden	BWR	ASEA-II	638	1974	Shut down
Ringhals 1	Sweden	BWR	ASEA-I	881	1974	Shut down
Barseback 1	Sweden	BWR	ASEA-II	600	1975	Shut down
Barseback 2	Sweden	BWR	ASEA-II	600	1977	Shut down
Olkiluoto 1	Finland	BWR	ASEA-III, BWR-2500	890	1978	Operating
Olkiluoto 2	Finland	BWR	ASEA-III, BWR-2500	890	1980	Operating
Forsmark 1	Sweden	BWR	ASEA-III, BWR-2500	1,104	1980	Operating
Forsmark 2	Sweden	BWR	ASEA-III, BWR-2500	1,121	1981	Operating
Forsmark 3	Sweden	BWR	ASEA-IV, BWR-3000	1,172	1985	Operating
Oskarshamn 3	Sweden	BWR	ASEA-IV, BWR-3000	1,400	1985	Operating

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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