The Isosuo solar power plant in Utajärvi was, upon completion, Finland’s first solar power plant exceeding 100 MW. Its total capacity is 106.8 MWp, and it produces approximately 97 GWh of renewable solar electricity per year, equivalent to the annual electricity consumption of about 12,000 households. The solar power plant has been built on a decommissioned peat production area. Across an area of approximately 150 hectares, 170,000 bifacial solar panels have been installed.
The project’s investment decision was made in December 2023, and construction began at the start of 2024. The first part of the plant was connected to the grid and electricity production began in May 2025. Construction of the solar power plant was completed at the end of 2025, and in spring 2026 the second part of the plant was also commissioned, meaning the solar power plant has been operating at full capacity since spring 2026. A 20 MW/40 MWh battery storage system is also being built alongside the plant; its construction is complete, but commissioning is still underway.
