Olkiluoto 2 to Resume Electricity Production in May – After Generator Rotor Replacement, Production Will Continue at a Lower Power Level

Electricity production at the Olkiluoto 2 plant unit (OL2) was interrupted on Tuesday, April 15, due to increased moisture detected in the turbine island’s generator. The issue has no impact on nuclear safety.

The estimate for resuming electricity production at OL2 is based on TVO’s previous experience with rotor replacements. A similar situation occurred last autumn, when OL2’s generator rotor failed, and the plant unit was operated for several months at reduced power following the rotor replacement.

The rotor now being installed is a refurbished spare part that arrived in Olkiluoto in April and is the last available rotor in TVO’s inventory. For this reason, the unit will continue to operate at a lower power level, based on conservative analyses to reduce the risk of failure.

After the rotor replacement, OL2 will produce electricity at a reduced output of 735 MW, compared to its full capacity of 890 MW. The power limitation will remain in effect until the 2026 annual outage.

The rotor replacement will be carried out before OL2’s regular annual outage. The outage, lasting approximately three weeks, is scheduled to begin on May 25.

Olkiluoto 1 is producing electricity normally. Olkiluoto 3 is currently undergoing its scheduled annual outage.

More detailed information on scheduling is available on the Nordpool electricity market platform: https://umm.nordpoolgroup.com