Group structure
TVO is part of the Pohjolan Voima group, whose parent company is Pohjolan Voima Oy.
The Teollisuuden Voima Oyj sub-group consists of TVO itself as the parent company and joint venture company Posiva Oy (of which TVO owns 60%) and the wholly owned subsidiaries TVO Nuclear Services Oy (TVONS), Olkiluodon Vesi and Perusvoima Oy.



