An information portal of the Federal government and the Länder

Unterweser nuclear power plant


Unterweser nuclear power plant in Lower Saxony is operated by PreussenElektra GmbH. Commercial operation began in 1979. The plant was shut down on 18 March 2011. Authorisation for power operation in accordance with the German Atomic Energy Act (AtG) expired on 6 August 2011. The first licence for decommissioning and dismantling was granted according to section 7 (3) AtG on 5 February 2018.


General information

SiteStadland (Kleinensiel district)
Federal stateLower Saxony
Type (construction line)Pressurised water reactor
Current operatorPreussenElektra GmbH
OwnerPreussenElektra GmbH

Operational data

Application date 7 April 1971
Start of construction 1972
First criticality 16 September 1978
First grid synchronisation 29 September 1978
Start of commercial operation 6 September 1979
Shutdown date 18 March 2011
Expiry of authorisation for power operation in accordance with the German Atomic Energy Act (AtG) 6 August 2011
First decommissioning and dismantling licence 5 February 2018
Second dismantling licence 15 July 2021

Technical data

Thermal reactor power3,900 MW
Gross electric capacity1,410 MW
Net electric capacity1,345 MW
Number of reactor coolant pumps4
Number and mass of fuel elements in the reactor core193, mass per fuel element 840 kg
Number of fuel rods per fuel element236
Composition of the nuclear fuel1.9-4.4 w/o U-235 (uranium oxide with 1.9 - 4.4 % U-235)
Number of control elements61
Type of cooling systemRiver water cooling