OL2 to resume power production with full capacity on April 19

The Olkiluoto 2 (OL2) nuclear power plant unit will return to full power output of 890 megawatts, said the owner of the plant Teollisuuden Voima Oyj (TVO) in a press release on Saturday.

The power increase will begin on Monday at 1:00 AM, and the unit is expected to reach full power on April 19.

OL2 had previously been operated at a reduced net output of 735 megawatts to minimize risks associated with damage to the generator rotor.

The damage was discovered in early September 2024, leading to a shutdown of electricity production and disconnection from the national grid.

The faulty water-cooled rotor was replaced with a spare rotor, and electricity production resumed on 6 October 2024.

To ensure operational reliability, production has continued at a reduced level for several months, as the rotor installed in October was the last spare rotor in TVO’s inventory.

A new spare rotor was delivered to Olkiluoto in April, enabling OL2 to resume electricity production at normal power levels.

Electricity production at Olkiluoto 1 and Olkiluoto 3 has continued normally during OL2's reduced output period.

Olkiluoto 3 is currently undergoing annual outage, which is scheduled to be completed on 2 May.

Olkiluoto 1’s annual outage is scheduled for 11–22 May, and Olkiluoto 2’s outage will take place between 25 May and 15 June.