Power line project

Tahkoluoto-Ulvila 400+110 kV power line

The Extension project of the Tahkoluoto offshore wind farm is expected to increase the green energy production in the area tenfold. The current offshore wind farm with its 11 wind turbines produces approx. 157 gigawatt hours annually, whereas the Extension is expected to generate up to 1800–2600 gigawatt hours per year.

As the existing power grid alone does not have the capacity to transmit the electricity to the main grid, Tahkoluoto Offshore Oy is planning an approx. 40 kilometres long 400+110 kV power line from Tahkoluoto to Fingrid’s substation in Ulvila. The new power line will strengthen the security of supply and act as back-up for the power transmission of the existing Tahkoluoto offshore wind farm. The new power line will also benefit the Port of Pori and the existing industry at Tahkoluoto, as well as boost new investments, e.g., in hydrogen industry.

The Tahkoluoto-Ulvila 400+110 kV power line project examines the possible routes and viable methods of transmission, with the aim of using existing structures as much as possible. The aim of the environmental impact assessment (EIA) phase is to reduce or prevent the negative environmental impact of projects. The findings of the EIA process will be taken into account in planning the implementation of the power line.

The EIA report for the power line project has now been finalized and was published in Sep 2025. The report is available on the website of Finland’s environmental administration (in Finnish) until Nov 17, 2025.

The final statement of the EIA, a reasoned conclusion, is expected to be made public by Jan16, 2026.

Juho Lappalainen

Juho Lappalainen

Project Development Manager

+358 50 560 7284 juho.lappalainen@arenso.fi

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