In 2025, Finland’s Loviisa Nuclear Power Plant delivered 7.9 terawatt-hours of electricity, supplying roughly 10 percent of the nation’s total consumption.
That output is equivalent to the electricity needs of the entire Helsinki metropolitan area, underscoring the plant’s critical role in Finland’s energy mix. Loviisa 1 generated 4.0 TWh with an availability of 89.9 percent, while Loviisa 2 produced 3.9 TWh at 88.8 percent availability. The overall plant availability reached 89.4 percent, slightly below the target due to extended outages and unplanned power reductions.
Sasu Valkamo, Senior Vice President of Loviisa, noted that Unit 1’s power was temporarily reduced in July and August as seawater temperatures rose, affecting cooling efficiency. The plant also experienced three short-term power reductions stemming from technical faults. Despite these operational challenges, Loviisa maintained production at a consistently high level, reflecting the stability and reliability expected from modern nuclear facilities.
Fuel strategy remains a key component of operational resilience. Last year, the plant continued its integration of Western nuclear fuel, loading the second batch supplied by Westinghouse into Unit 2 during the annual outage. The gradual diversification of fuel sources is intended to strengthen supply security and optimize reactor performance over the long term.
Looking ahead, 2026 will see the launch of several modernization projects under an extensive investment program aimed at sustaining safe and reliable electricity production through the plant’s operating license, which extends until 2050. Planned upgrades include the modernization of low-pressure turbines, renewal of turbine automation systems, and replacement of main seawater pumps and motors. Each project will be evaluated individually, with Fortum targeting continuous operations over the next three decades. Total investment needs for the plant are projected at approximately one billion euros, reflecting the scale of long-term maintenance and modernization efforts required for older nuclear infrastructure.
The Loviisa plant also represents a significant local employer. Fortum directly employs around 580 staff at the site, complemented by roughly 100 employees from partner companies working daily and approximately 650 contractors participating in annual outages. Seasonal staffing includes about 100 trainees and temporary workers, ensuring sufficient labor for both routine operations and intensive maintenance periods. Fortum’s investments in the plant rose to approximately 70 million euros in 2025, up from 50 million euros in 2024, reflecting an ongoing commitment to operational reliability and workforce support.
