The company operates Olkiluoto Nuclear Power Plant, which consists of two BWRs (boiling water reactors), an EPR (European Pressurized Reactor) which reached full operational capacity in 2023, and formerly one half of a coal-fired power plant along with a wind farm.

[9] On 21 April 2010, the Government of Finland decided to grant a permit for the construction of a fourth reactor at Olkiluoto.

[13] In January 2015 TVO announced plans to save around $17.7 million per year through 'efficiency-related structural changes' which are expected to cause up to 110 job cuts.

The CEO of TVO, Jarmo Tanhua, explained the reasons as: The competitiveness of the electricity produced in Olkiluoto has declined during the recent years and the outlook of the future is uncertain.

[14]An October 2016 story in the Süddeutsche Zeitung reported that TVO called on Siemens to take financial responsibility for the completion of unit 3 of the Olkiluoto Nuclear Power Plant, because its project partner, the French Areva Group, was restructured by the French government.