Eastern Finland’s Largest Wind Farm Completed in Pieksämäki – Helen’s Wind Capacity Tops 900 MW

The park, made up of 22 turbines, is the largest in Eastern Finland and delivers a total output of 145.2 MW. With an annual production of more than 400 GWh, it can cover the yearly electricity consumption of roughly 80,000 households. Construction began in November 2022 and the site was handed over to its owners in September 2025.

“The Niinimäki wind farm reinforces Helen’s generation portfolio and our foothold in the energy market. More than 90 percent of our electricity production is already carbon-free, and our facilities are spread across Finland. Niinimäki now brings wind power to Eastern Finland as well. Excellent cooperation among all parties made this project a success,” says Harri Mattila, Helen’s Director of Power Generation and Energy System Optimisation.

Building wind power in Eastern Finland is an important part of a geographically balanced clean transition. Traditionally, wind-power investments have focused on Western and Northern Finland, but projects like Niinimäki strengthen the role of the East. This boosts Finland’s overall energy security, supports local businesses, and creates new opportunities—for example, in electrifying industry—while also easing the load on the national grid.

Helen’s clean-transition projects are advancing rapidly. In addition to wind farms, Helen is developing solar parks and investing in energy storage, increasing the flexibility of Finland’s energy system. The company is systematically cutting emissions and aims to phase out combustion-based energy production by 2040.