Project under development Riuttamäki wind farm project

The municipal executive boards of Marttila and Koski Tl have decided to initiate the preparation of the Riuttamäki wind power partial master plan on the municipal border for the areas located within their respective municipalities. The wind power partial master plan will be prepared so that building permits for wind turbines can be granted directly based on the partial master plan (AKL Section 77a). The partial master plan will be processed separately by the municipal councils of Marttila and Koski Tl for their respective areas.

The Participation and Assessment Plans related to the initiation of the Riuttamäki wind power partial master plan will be publicly available from 10 June to 10 July 2026 in Marttila at the municipal office (Härkätie 773) and the library (Härkätie 723), and in Koski Tl at the municipal office (Härkätie 5) and the library (Hämeentie 12) during opening hours. Throughout the project, the materials will also be available on the municipalities’ websites: www.marttila.fi and www.koski.fi.

Any opinions must be submitted during the public display period to the municipalities’ registry offices by post or email:

• Municipality of Marttila, Härkätie 773, 21490 Marttila or kunta@marttila.fi
• Municipality of Koski Tl, Härkätie 5, 31500 Koski Tl or kunta@koski.fi

For further information, please contact:

• Municipality of Marttila: Municipal Manager Anne Ahtiainen, tel. +358 44 744 9110, anne.ahtiainen@marttila.fi
• Municipality of Koski Tl: Municipal Manager Henri Partanen, tel. +358 44 744 1112, henri.partanen@koski.fi

Presentation events for the project and the Environmental Impact Assessment (EIA) Programme will be held in the municipalities of Marttila and Koski Tl as follows:

• Wednesday 17 June 2026 at 18:00–20:00 at the POP Bank auditorium in Koski Tl (Hämeentie 14, 31500 Koski Tl).

The meeting can also be attended remotely. Join the meeting here

• Meeting ID: 310 094 315 697 01, Passcode: sN2hE24e

• Monday 22 June 2026 at 18:00–20:00 at Kuokantalo in Marttila (Marttilantie 18, 21490 Marttila).

The meeting can also be attended remotely. Join the meeting here

• Meeting ID: 339 323 326 786 423, Passcode: TU7AR6Si

Coffee will be served at both occasions starting at 17:30.

The materials for the project's EIA Programme are available for public review from 22 May to 17 July 2026. The materials can be viewed at the following locations:

• Koski Tl Municipal Office (Härkätie 5, 31500 Koski Tl)
• Koski Tl Library (Hämeentie 12, 31500 Koski Tl)
• Marttila Library (Härkätie 723, 21490 Marttila)
• Lieto Main Library (Kirkkotie 13, 21420 Lieto)

More information can be found here.

The zoning and environmental impact assessment procedure (EIA) for the wind farm is initiated by preparing a participation and assessment plan (PAP) and an EIA Programme. The participation and assessment plan defines, among other things, the project's background, objectives and progress, as well as how stakeholders can influence the project. The EIA Programme is the project proponent's plan for how the environmental impact assessment will be conducted. The programme describes the project, its alternatives and the impacts to be assessed. In addition, it outlines how information provision and participation will be organized. The content requirements for the EIA Programme can be found in the EIA Decree (Section 3). The PAP and EIA Programme are scheduled to be made available for public review during 2026.

The municipal executive boards of Marttila and Koski TL decided on 08 December 2025 to initiate the partial master plan zoning for a wind farm in the Riuttamäki area.

Axpo Renewable Finland Oy submitted a proposal for partial master plan zoning of a wind farm to the municipal executive boards of Marttila and Koski TL on 31 March 2025.