Olkiluoto produces 25%, Loviisa 10% of Finland´s power consumption

A total of 23.41 TWh of electricity was produced at the Olkiluoto (OL) nuclear power plant in 2025, which is about a quarter of the Finnish electricity consumption, said the owner of the plant Teollisuuden Voima Oyj (TVO) in a press release on Monday.

Production at Olkiluoto 3 ( OL3) totalled 10.38 TWh last year. 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.

Last year, Olkiluoto 1 (OL1) produced 7.49 TWh of electricity with an availability factor of 96.2 %.

Apart from the annual outage, 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.

Annual production in Olkiluoto has increased significantly as a result of the completion of OL3 and the power uprates at OL1 and OL2.

Electricity production in 2025 was about twice as high as the 11.68 TWh production 30 years ago in 1995.

Meanwhile, in 2025, Loviisa Nuclear Power Plant generated a total of 7.9 terawatt-hours of electricity, said plant owner Finnish majority state-owned energy company Fortum in a press release on Monday.

The plant's electricity production accounts for approximately 10% of the electricity consumed in Finland, which is nearly equivalent to the electricity consumption of the entire Helsinki metropolitan area.

Loviisa 1 produced 4.0 TWh with an availability of 89.9%, while Loviisa 2 produced 3.9 TWh with an availability of 88.8%. The overall availability of the plant was 89.4%.