Nordic Nuclear Power

Olkiluoto nuclear power plant live

Total active power

2,914MW
88% total utilization

Last updated:

3

Active reactors

0

Maintenance

0

Outages

Reactors at Olkiluoto

Olkiluoto 1

Eurajoki, Satakunta
Operational
98%

Current power

873

/ 890 MW

Reactor typeBoiling water reactor
A boiling water reactor (BWR) allows water to boil directly in the reactor, creating steam that drives the turbines. This is a simpler design but requires the turbines to handle radioactive steam.
Operators

Teollisuuden Voima Oyj

Olkiluoto 2

Eurajoki, Satakunta
Operational
83%

Current power

741

/ 890 MW

Reactor typeBoiling water reactor
A boiling water reactor (BWR) allows water to boil directly in the reactor, creating steam that drives the turbines. This is a simpler design but requires the turbines to handle radioactive steam.
Operators

Teollisuuden Voima Oyj

Planned
ReasonGenerator rotor limitation
Expected completionApr 18, 2027

Message details

MessagePlanned
StatusFailureReasonGenerator rotor limitationPublication dateAug 26, 2026, 11:44 AMExpected completionApr 18, 2027, 03:00 PMRemarksThe maximum power of OL2 is limited due to rotor limitation.

Olkiluoto 3

Eurajoki, Satakunta
Operational
81%

Current power

1,300

/ 1,600 MW

Reactor typePressurized water reactor
A pressurized water reactor (PWR) uses pressurized water as a coolant to prevent boiling. This water transfers heat to a secondary circuit that drives the turbines, ensuring that radioactive water never reaches the turbines.
Operators

Teollisuuden Voima Oyj

Unplanned(2)
ReasonOlkiluoto 3 net output remains at approximately 1300 MW due to technical faults in two main primary coolant pumps in the nuclear island.
Expected completionSep 9, 2026

All messages(2)

Message 1Unplanned
StatusFailureReasonOlkiluoto 3 net output remains at approximately 1300 MW due to technical faults in two main primary coolant pumps in the nuclear island.Publication dateAug 17, 2026, 06:21 AMExpected completionSep 9, 2026, 10:00 PMRemarksEvent stop updated.
Message 2Planned
StatusFailureReasonThe power of OL3 power plant is limited due to the capacity of system protection.Publication dateJul 16, 2026, 06:40 AMExpected completionSep 9, 2026, 10:00 PMRemarksThe maximum power of OL3 is limited to 1590 MW when Olkiluoto battery energy storage system is part of System Protection and without battery energy storage system 1570 MW due to limitations set by Fingrid.

About Olkiluoto nuclear power plant

Olkiluoto nuclear power plant is located on Olkiluoto island in Eurajoki, Satakunta, and is operated by Teollisuuden Voima (TVO). Olkiluoto 1 and 2 are 890 MW boiling water reactors commissioned in 1979 and 1982. Olkiluoto 3, a 1,600 MW EPR pressurized water reactor, entered commercial operation in 2023 and is Europe's largest reactor. Olkiluoto is also home to Onkalo, the world's first deep geological repository for spent nuclear fuel.

Olkiluoto nuclear power plant in Eurajoki operates three reactors. Olkiluoto 1 and 2 are boiling water reactors with a net output of 890 MW each. Olkiluoto 3 is an EPR pressurized water reactor with a net output of 1,600 MW.

Olkiluoto at a glance

Location
Eurajoki, Satakunta, Finland
Type
BWR (OL1–2), PWR/EPR (OL3)
Operators
Teollisuuden Voima Oyj (TVO)

Frequently asked questions about Olkiluoto

How many reactors are there at Olkiluoto?

Three: Olkiluoto 1 and 2 (890 MW each) and Olkiluoto 3 (1,600 MW). The plant's combined capacity is about 3,400 MW.

How big is Olkiluoto 3?

Olkiluoto 3 has a net output of 1,600 MW, making it the most powerful reactor in Finland and in Europe. On its own it supplies around 14 percent of Finland's electricity.

Is Olkiluoto 3 operating right now?

The reactor card shows OL3's current output based on TVO data. If the reactor is offline, the reason is shown from Nord Pool's UMM messages.

What is Onkalo?

Onkalo is Posiva's final repository for spent nuclear fuel at Olkiluoto, built 400–450 metres deep in the bedrock. It is the first facility of its kind in the world.

Other nuclear power plants

Loviisa nuclear power plant

Loviisa nuclear power plant operates two VVER-440 pressurized water reactors with a net output of 507 MW each. Because the real-time source used here does not split generation by unit, the plant's calculated total is shown as one combined card.

Location

Loviisa, Uusimaa, Finland

Type

Two pressurized water reactors (VVER-440)

Operators

Fortum Power and Heat Oy

View reactor status
All Finnish reactors

Data sources and reliability

All power data presented on this page comes from official data sources. Power data for Olkiluoto 1–3 comes directly from Teollisuuden Voima Oyj (TVO), while Finland's total nuclear generation comes from Fingrid. Loviisa's combined value is calculated by subtracting Olkiluoto 1–3 from Fingrid's total. Data related to maintenance and outages comes from the Nord Pool UMM platform (Urgent Market Messages), a European platform for sharing information about maintenance and outages on the power grid. This ensures accurate, up-to-date information about Finland's nuclear power generation.

Data sources include Teollisuuden Voima Oyj (TVO), Fingrid Open Data, and the Nord Pool UMM Platform, providing comprehensive coverage of all Finnish nuclear reactors. Fingrid data is used under CC BY 4.0, and the Loviisa calculation is a modification of the source data made by Nordic Nuclear Power.