Kraftwerk Union

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Kraftwerk Union AG

legal form Corporation
founding 1969
Seat Mülheim an der Ruhr , Germany
Number of employees 14,000
Branch Power plant construction

The Kraftwerk Union AG ( KWU ) was a joint subsidiary of Siemens and AEG . It operated the construction of power plants , especially nuclear power plants . The locations were Mülheim an der Ruhr , Erlangen , Berlin , Karlstein am Main and Offenbach am Main . The KWU later became synonymous with Siemens' power plant business.


  • After the nuclear power plant divisions of Siemens and AEG cooperated from 1968, Kraftwerk Union AG, based in Mülheim, was founded in 1969 from the power plant divisions of AEG and Siemens. Steam turbines and generators were manufactured at the Mülheim site, and gas turbines at Berlin. Development and planning took place at the Erlangen and Offenbach locations. In the same year, the Transformatoren Union (TU) was also founded by the corporations. Up to this point, AEG had only built boiling water reactors based on the technology of the US company General Electric , while Siemens had built pressurized water reactors under license from Westinghouse . But Siemens' non-nuclear power plant business was also integrated into KWU. Five years later, the AEG nuclear power division was taken over by KWU. Another division was KWU-Umwelttechnik GmbH, which, for example, offered smoldering systems in cooperation with MAN-Gutehoffnungshütte GmbH .
  • In 1977 Siemens became the sole shareholder of KWU AG.
  • In 1978 AEG also sold parts of the Transformatoren Union to the KWU. On October 1, 1987 the takeover of KWU and TU was completed.
  • The KWU experienced its most successful period in the 1980s with the construction of the so-called convoy reactor line. Abroad, KWU is involved in the construction of the Gösgen nuclear power plant in Switzerland , from 1974 on the power plant near Bushehr (Iran) destroyed by Iraqi air raids , the heavy water reactors Atucha  I and II in Argentina, and the Angra  2 and 3 nuclear power plant (for block 3 only almost all parts were delivered, but was not under construction during the KWU era) in Brazil. The only commercial nuclear power plant in Austria, the Zwentendorf nuclear power plant , never went into operation after it was built by the KWU. In Germany, it was also involved in the construction of various advanced reactors, such as the fast breeder in Kalkar , the KNK II research reactor in Karlsruhe and the FRM and FRM2 research reactors in Munich .
  • SIEMENS SNP and PG: The nuclear division of KWU was spun off in July 2000 under the name Siemens Nuclear Power GmbH , the conventional power plant and turbine division was renamed Power Generation .
  • From the beginning of the 1990s, the French Framatome began developing the European Pressurized Water Reactor together with Siemens' nuclear power subsidiary . The German side was primarily responsible for the safety-related aspects ( material testing and others). The control technology (Siemens Teleperm M ) was also developed in Germany.
  • The political and public attitude towards nuclear power in Germany as well as the poor order situation - Siemens' nuclear power division was almost exclusively active in the maintenance and fuel business - led Siemens to decide to outsource the nuclear power business again and to sell the majority stake.
  • Framatome ANP - Siemens and the French company Framatome formed a joint venture in 2001: Siemens SNP and Framatome became Framatome ANP - Siemens AG received a 34 percent stake in Framatome ANP. In March 2006 the name was changed to Areva NP .
  • Power Generation (PG) and Power Transmission and Distribution (PTD) remained 100 percent integrated in the Siemens Group as business areas.
  • On March 18, 2011, Siemens sold all of its shares in Areva NP for 1.62 billion euros to its parent company Areva.
  • In 2018, the majority of Areva NP was sold to EDF and has been trading under the Framatome name again since then.

Nuclear power plants (commercial power reactors)

The following nuclear power plants or reactor blocks were built by Kraftwerk Union.

Boiling water reactors (BWR)

Reactor block designated
country status operator
Würgassen NPP KWW Germany dismantled PreussenElektra
Brunsbüttel NPP KKB Germany Out of service Vattenfall
Zwentendorf / Tullnerfeld nuclear power plant GKT Austria not put into operation Joint nuclear power plant Tullnerfeld GmbH
Philippsburg NPP 1 KKP-1 Germany Out of service EnBW
Isar NPP 1 KKI-1 Germany Out of service PreussenElektra
KKW Krümmel KKK Germany Out of service Vattenfall
NPP Gundremmingen B KRB-B Germany Out of service RWE
NPP Gundremmingen C KRB-C Germany Operational management RWE

Pressurized water reactors (PWR)

Reactor block designated
country status operator
Obrigheim NPP KWO Germany In dismantling (by 2020) EnBW
Stade NPP KKS Germany In dismantling (until 2023) PreussenElektra
Borssele NPP KCB Netherlands Operational management EPZ
Biblis A KWB-A Germany Out of service RWE
Biblis B NPP KWB-B Germany Out of service RWE
Neckarwestheim NPP 1 GKN-1 Germany Out of service EnBW
Neckarwestheim NPP 2 GKN-2 Germany Operational management EnBW
Lower Weser NPP KKU Germany Out of service PreussenElektra
Trillo NPP 1 CNT1 Spain Operational management ENDESA
Trillo NPP 2 CNT2 Spain Appointed in 1981/82, not established ENDESA
Regodola NPP CT Spain Appointed in 1981/82, not established
Gösgen NPP KKG Switzerland Operational management Gösgen-Däniken AG
Brokdorf NPP KBR Germany Operational management PreussenElektra
Grohnde NPP KWG Germany Operational management PreussenElektra
Philippsburg NPP 2 KKP-2 Germany Out of service EnBW
Grafenrheinfeld NPP KKG Germany Out of service PreussenElektra
Emsland NPP KKE Germany Operational management RWE
Isar NPP 2 KKI-2 Germany Operational management PreussenElektra
Angra nuclear power plant 2 ANG Brazil Operational management Eletrobrás
Angra NPP 3 ANG Brazil Under construction Eletrobrás
Bushehr NPP 1 BNPP Iran Operations management, modified to VVER-1000/446 Nuclear Power Production & Developement Co. of Iran
Bushehr NPP 2 BNPP Iran Construction canceled Nuclear Power Production & Developement Co. of Iran

Other Konvoi- type plants previously planned for Germany were the Wyhl nuclear power plant (south), the Hamm nuclear power plant , the Borken nuclear power plant , the Pfaffenhofen nuclear power plant and the Biblis C nuclear reactor .

Buschehr 1 nuclear power plant was completed by Atomstroiexport and the technical structure now corresponds to the Russian construction line VVER-1000/446, not the KWU pressurized water reactors.

Heavy water reactors

Reactor block designated
country status operator
Niederaichbach NPP KKN Germany dismantled → green meadow Niederaichbach GmbH nuclear power plant
Atucha NPP 1 CNA1 Argentina Operational management Nucleoeléctrica Argentina SA
Atucha NPP 2 CNA2 Argentina Operational management Nucleoeléctrica Argentina SA

Research reactors

Furthermore, Kraftwerk Union operated two research reactors in Karlstein am Main in the 1960s and 1970s , the AEG test reactor (PR-10) and the AEG zero-energy reactor (TKA), which were taken over by AEG.

Web links

Individual evidence

  1. Kraftwerk Union AG and its service system
  2. Commercial register entry HRB 499, District Court Mülheim / Ruhr
  3. Siemens leaves the French nuclear company . World online ; Retrieved May 31, 2011.
  4. Signing of definitive binding agreements for the sale of AREVA NP's activities. December 22, 2017, accessed January 10, 2019 (en-en).
  5. Convention on Nuclear Safety ( Memento of March 22, 2011 in the Internet Archive ) (PDF; 3.79 MB), Report of the Government of the Federal Republic of Germany for the Fourth Review Meeting in April 2008
  6. Würgassen power station. In: , accessed on July 6, 2018.
  7. a b Roland Kollert: The policy of latent proliferation: military use "peaceful" nuclear technology in Western Europe . In: DUV , 1994, ISBN 3-8244-4156-X
  8. ^ Christian Sebald: 33 years of operation, 20 years of demolition . In: . June 20, 2015, ISSN  0174-4917 ( [accessed July 7, 2017]).