Nuclear reactors supplied by Siemens / Kraftwerk Union

Siemens / Kraftwerk Union is recorded as the nuclear steam supply system (NSSS) supplier of 29 units in 6 countries, per the IAEA PRIS register: 6 operating with 4,803 MWe net, 1 under construction and 22 shut down.

Germany's pressurized and boiling water reactors, and the pressure-vessel PHWRs at Atucha. By country: Germany (22), Argentina (2) and Brazil (2). By technology: 18 PWR, 8 BWR and 3 PHWR. The first unit was connected in 1966 and the most recent in 2014. The most powerful unit in operation is Angra 2, in Brazil, with 1,275 MWe. One unit is under construction: Angra 3 (Brazil). 22 units have been permanently shut down.

PRIS supplier codes: KWU, SIEMENS, S/KWU, SIEM,KWU, AEG,KWU, AEG · Reference · Names per IAEA, Nuclear Power Reactors in the World 2025, table 25

Units with a Siemens / Kraftwerk Union nuclear steam supply system

Unit	Country	Type	Model	MWe	Grid connection	Status
MZFR	Germany	PHWR	—	52	1966	Shut down
Lingen	Germany	BWR	BWR	183	1968	Shut down
Obrigheim	Germany	PWR	Siemens	340	1968	Shut down
Wuergassen	Germany	BWR	BWR-69 (AEG)	640	1971	Shut down
Stade	Germany	PWR	Siemens	640	1972	Shut down
Borssele 1	Netherlands	PWR	KWU 2LP	482	1973	Operating
Atucha 1	Argentina	PHWR	Siemens-KWU	340	1974	Operating
Biblis A	Germany	PWR	unknown	1,167	1974	Shut down
Biblis B	Germany	PWR	unknown	1,240	1976	Shut down
Brunsbuettel	Germany	BWR	BWR-69	771	1976	Shut down
Neckarwestheim 1	Germany	PWR	KWU	785	1976	Shut down
Isar 1	Germany	BWR	BWR-69	878	1977	Shut down
Unterweser	Germany	PWR	KWU	1,345	1978	Shut down
Philippsburg 1	Germany	BWR	BWR-69	890	1979	Shut down
Goesgen	Switzerland	PWR	KWU 3-loops	1,010	1979	Operating
Grafenrheinfeld	Germany	PWR	KWU	1,275	1981	Shut down
Kruemmel	Germany	BWR	BWR-69 (KWU)	1,346	1983	Shut down
Grohnde	Germany	PWR	KWU	1,360	1984	Shut down
Gundremmingen B	Germany	BWR	BWR-72 (KWU)	1,284	1984	Shut down
Gundremmingen C	Germany	BWR	BWR-72 (KWU)	1,288	1984	Shut down
Philippsburg 2	Germany	PWR	KWU	1,402	1984	Shut down
Brokdorf	Germany	PWR	KWU	1,410	1986	Shut down
Emsland	Germany	PWR	Konvoi (KWU)	1,335	1988	Shut down
Isar 2	Germany	PWR	Konvoi (KWU)	1,410	1988	Shut down
Trillo 1	Spain	PWR	KWU 3 loops	1,003	1988	Operating
Neckarwestheim 2	Germany	PWR	Konvoi (KWU)	1,310	1989	Shut down
Angra 2	Brazil	PWR	Pre-Konvoi	1,275	2000	Operating
Atucha 2	Argentina	PHWR	Siemens-KWU	693	2014	Operating
Angra 3	Brazil	PWR	Pre-Konvoi	1,340	2028	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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