 After the war, PreussenElektra's assets in East Germany came under state control and the headquarters of PreussenElektra were moved from Berlin to Hanover in 1947.In 1957 PreussenElektra and NWK, together with other electricity utilities, founded a nuclear energy research company "Studiengesellschaft für Kernkrafte GmbH".During the early 1960s NWK began its cooperation with electric utilities from neighboring countries.