Loviisa Nuclear Power Plant Delivers Strong Output and Advances Modernisation Plans

Loviisa Nuclear Power Plant Delivers Strong Output and Advances Modernisation Plans

(IN BRIEF) Fortum’s Loviisa Nuclear Power Plant produced 7.9 TWh of electricity in 2025, covering roughly 10% of Finland’s electricity consumption and achieving an overall availability rate of 89.4%. While production remained at a strong level, output was slightly impacted by extended outages, temporary power reductions linked to high seawater temperatures, and technical issues. The plant continued its transition to western nuclear fuel with the loading of a second Westinghouse fuel batch. Looking ahead, Fortum plans to launch several modernisation projects in 2026 as part of a long-term investment programme supporting operations through 2050. Loviisa also continues to play a major role as a regional employer and recipient of significant ongoing investment.

(PRESS RELEASE) ESPOO, 5-Jan-2026 — /EuropaWire/ — Fortum reports that its fully owned Loviisa Nuclear Power Plant generated a total of 7.9 terawatt-hours (TWh) of electricity in 2025, corresponding to around 10% of Finland’s total electricity consumption. The output is nearly equivalent to the annual electricity demand of the Helsinki metropolitan area, underlining the plant’s continued importance to Finland’s energy system.

During the year, Loviisa unit 1 produced 4.0 TWh of electricity with an availability rate of 89.9%, while unit 2 generated 3.9 TWh with an availability of 88.8%. The overall availability of the plant reached 89.4%. Production levels remained solid, although output fell slightly below internal targets due to extended annual outages and a limited number of unplanned power reductions.

According to Sasu Valkamo, Senior Vice President of the Loviisa power plant, temporary power reductions during the summer months were partly caused by elevated seawater temperatures, while several short-term reductions resulted from technical faults. Despite these challenges, progress continued in the transition to western nuclear fuel, with the second batch of fuel supplied by Westinghouse successfully loaded into unit 2 during the annual outage.

Looking ahead, Loviisa Nuclear Power Plant is preparing to launch several major modernisation projects as part of a long-term investment programme aimed at ensuring safe and reliable operations well into the future. The plant holds an operating license granted by the Finnish Government through 2050, with total planned investments estimated at approximately EUR 1 billion. Projects scheduled to begin during the extensive annual outage in 2026 include the modernisation of low-pressure turbines, renewal of turbine automation systems, and replacement of main seawater pumps and motors. Each investment will be assessed and approved individually.

Loviisa Nuclear Power Plant also remains a significant employer in the region. The site employs around 580 Fortum staff, alongside nearly 100 permanent employees from partner companies. In addition, approximately 650 contractor employees supported annual outage activities, and around 100 summer trainees and temporary workers were engaged during peak periods. Fortum’s investments at the Loviisa plant totalled around EUR 70 million in 2025, compared with approximately EUR 50 million in the previous year.

Further information:
Fortum News Desk, newsdesk@fortum.com, +358 40 198 2843

Loviisa Nuclear Power Plant

In 2025, the availability at Fortum’s fully-owned Loviisa nuclear power plant was 89.4%. In 2025, the power plant produced a total of 7.9 terawatt hours of electricity, which is approximately 10% of Finland’s electricity production. Fortum employs about 800 nuclear sector professionals, 580 of them work at the Loviisa power plant. Additionally, nearly 100 permanent employees of other companies work in the power plant area every day. More information: http://www.fortum.com/loviisa

SOURCE: Fortum Corporation