TVO – A Quarter of Finnish Electricity in 2025 Was Produced in Olkiluoto
Teollisuuden Voima Oyj (TVO, ENS Corporate Member) announced that, in 2025, a total of 23.41 TWh of electricity was produced at the Olkiluoto nuclear power plant.
The amount equals about a quarter of the Finnish electricity consumption. In particular, the newest plant unit, Olkiluoto 3 (OL3), produced electricity without any interruptions during the year.
Production at OL3 totalled 10.38 TWh last year, so recording the best year so far for the plant unit in terms of both production and reliability: there were no unplanned interruptions and the availability factor of the plant unit was 82.6 %, the highest in the three-year operational history of the plant unit.
The next planned outage at OL3 will occur in the autumn of 2026, as last spring, for the first time, the unit received fuel for an operating cycle of 18 months.
Olkiluoto 1 (OL1) produced 7.49 TWh of electricity with an availability factor of 96.2 %. Apart from the annual outages, production was disrupted in May as a result of a damaged condenser tube. The disruption was a brief one, keeping the unit off the grid for only about 25 hours.
The annual production of Olkiluoto 2 (OL2) was 5.55 TWh and the availability factor of the unit was 71.2 %. Production at OL2 was halted as a result of a generator rotor fault detected in April, which caused an interruption of about three weeks in electricity production at the plant.
Read the full TVO Press Release.
Finland currently operates five reactors: two in Loviisa and three in Olkiluoto. In 2024, the Finnish nuclear fleet accounted for approximately a 39% share of electricity production (31.1 TWh).
