Punkalaidun In development

Isosuo in numbers


number of turbines


Ilmatar is developing Isosuo wind farm located in the southwestern part of Punkalaidun municipality. The planned areas have predominantly been in peat production use. High-quality wind conditions, distance to residential areas and compatibility with existing land use purposes make especially Isosuo a suitable area for wind power production.

A partial land use plan has been prepared for the Isosuo project and the plan was accepted by the municipality of Punkalaidun in 2015. The plan allows for constructing up to 6 wind turbines with tip heights up to 210m. The environmental impacts of the project have been assessed as part of the land use plan process.

The parallel use of the wind farm areas for example in recreational and berry picking purposes will be allowed also after the wind farm has been commissioned.


The construction schedule of the Isosuo wind farm depends on when the granted building permits become legally valid. Construction can potentially start in 2024, with the commencement of production taking place in 2025.

Ilmatar has been developing the Isosuo wind farm projects in close collaboration with YIT Rakennus Oy in the past. Ilmatar has since acquired YIT’s share in the project companies and is currently the sole developer.

Ilmatar is progressing the Isosuo wind farm project towards construction phase through its project company, Punkalaitumen Tuulivoima Oy, which is domiciled in Punkalaidun.

The municipality of Punkalaidun declared the enabling master plan of the Isosuo wind power project legally binding on March 9, 2020. The building control committee of Punkalaidun municipality granted the building permits for the planned wind turbines on March 30, 2021. The building permits allow for the construction of six wind turbines with a maximum height of 210 meters. Appeals regarding the building permits were processed by the Administrative Court, and a decision led to the annulment of building permit for four wind turbines and appeal right to the Supreme Administrative Court. This means that the area has legal building permit for two wind turbines.

Wind measurements will be finished in the are during autumn 2023. Ilmatar will analyse the project’s technical economic feasibility with two wind turbines and the possibility to apply new building permits. Ilmatar will also investigate the possibility to build a solar power park as a part of the project.


Further information

Ville Huovinen
Ilmatar Energy Oy
+358 45 672 1192
[email protected]