Electricity production at Olkiluoto 2 has been interrupted due to a fault
2.1.2026
Electricity production at OL2 was interrupted on Friday, 2 January 2026 at 10:59 due to a fault detected in the reactor plant.
A software update to the reactor power control system was carried out today, 2 January, at the Olkiluoto 2 plant unit. During the update, a fault occurred, resulting in a reactor trip. A reactor trip is a safety function in which the nuclear reaction in the plant unit is automatically shut down and electricity production is interrupted. The plant operated as designed during the event.
The event has no effect on nuclear safety.
The Olkiluoto OL1 and OL3 plant units continue in normal production operation.
You can follow the schedule for resuming electricity production at https://umm.nordpoolgroup.com/
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