TVO Nuclear Services Oy (TVONS) is a wholly-owned subsidiary of TVO. TVONS provides its customers with expertise in high-level nuclear safety, cost-effective operations, and nuclear waste management and services related to building new nuclear plants. The special expertise and networks of TVO personnel is at TVONS customers' disposal.
Posiva Oy, jointly owned by TVO and Fortum, is responsible for the research of the final disposal of spent nuclear fuel and implementation of the final repository of its shareholders' Olkiluoto and Loviisa NPPs. Posiva Solutions Oy (PSOY) is wholly-owned subsidiary of Posiva. As stated in its Articles of Association PSOY does nuclear waste management consultancy and planning, research and development activity related to the industry.
