New part might not be installed at Finland nuclear station until 2027
Electricity production at the Olkiluoto-2 nuclear power plant in Finland is expected to continue at a reduced power level of 735 MW until a completely new generator rotor has been received and installed, potentially during a planned 2027 outage.
Owner and operator Teollisuuden Voima Oyj (TVO) had previously announced that the reduced power level would continue until the 2026 annual outage. The unit’s full capacity is 890 MW.
Olkiluoto-2 has been operating at a reduced power level to minimise risks associated with damage to the generator rotor, which is part of a system that converts the mechanical energy from the turbine into electrical energy that is sent to the power grid.
TVO does not have a spare generator rotor in storage. A refurbished spare rotor is expected to arrive at Olkiluoto in early 2026.
“The completely new and technically improved rotor is expected to arrive at Olkiluoto by the 2027 annual outage,” TVO said.
The generator rotor originally malfunctioned in September 2024.
Olkiluoto-2, a boiling water reactor unit that began commercial operation in July 1982, is one of three nuclear plants at the Olkiluoto site, about 270 km west of the capital Helsinki.
