The Hallanvahti project is 100% owned by the Taaleri SolarWind III fund, managed by Taaleri Energia, a Finnish-based wind, solar and battery energy storage developer and fund manager.

The 129 MWp Hallanvahti project is situated approximately 6.5 kilometers from Joroinen in east-central Finland. Spanning around 200 hectares of wet peatland with a lightly dense forest, the site features a thick layer of peat, ranging from 500mm to 7000mm in depth. The project’s goal is to preserve the peat layer throughout its construction and lifecycle while effectively managing the water flow.

This project includes over 206,000 solar panels on an east/west tracking system, making it the largest of its kind in Finland. It is expected to generate between 130 and 145 GWh of electricity annually, sufficient to power thousands of homes and businesses. Over its projected 40-year lifespan, the project will produce a total of 5,200 to 5,800 GWh of clean energy. During its lifetime the project will supply energy to nearly 300,000 single-family homes or nearly 1.5 million apartment buildings. With the energy produced by the project, it would also be possible to drive an electric car for up to 25 billion kilometers.

Extensive environmental, soil, and hydrological investigations have been conducted to ensure the sustainability and efficiency of the site. The project has been developed by Etec Automation Oy and 3Flash Finland Oy. As part of the process, Etec Automation Oy and 3Flash Finland Oy worked with Pelastakaa Sysmäjärvi ry, Joroinen municipality, and Pohjois-Savo ELY Centre on a locally important water protection project, aiming to significantly improve the water quality of Sysmäjärvi in the long term.

When realised, the project will be a significant employer, creating up to 290 person-years of work with annual maintenance work for at least 30 years.

This operation benefits from support from the European Union under the InvestEU Fund. This project has received funding from the European Union's NextGenerationEU campaign.