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Suomen Hyötytuuli carries out a full demerger to prepare for large-scale offshore wind power investments

The Finnish wind energy company Suomen Hyötytuuli Oy will carry out a full demerger to strengthen its offshore wind production. The wind farms owned by Suomen Hyötytuuli will transfer to a new company by the same name, whereas Tahkoluoto Offshore Oy will assume ownership of the Tahkoluoto demonstration and extension project. Arenso Oy will provide wind energy life-cycle services to both Suomen Hyötytuuli Oy and Tahkoluoto Offshore Oy. Suomen Hyötytuuli’s wind energy production and ongoing projects will continue without interruption throughout the demerger.

 The role of renewable energy in energy production is expected to grow in the coming years. In order to prepare for a significant rise in energy production and investments in offshore wind, Suomen Hyötytuuli has decided to carry out a demerger. The demerger will allow for cost-efficient and flexible use of resources and wind energy expertise, as well as open up possibilities for further development of ownership structures and investment partnerships.

The three new companies will be owned by Suomen Hyötytuuli’s current owners: Alva-yhtiöt Oy, Helen Oy (Oy Mankala Ab), Lappeenrannan Energia Oy, Lahti Energia Oy, Oy Turku Energia – Åbo Energi Ab, Pori Energia Oy, Tampereen Energia Oy and Vantaan Energia Oy.

Suomen Hyötytuuli’s onshore wind farms and the current Tahkoluoto offshore wind farm will be owned by the new Suomen Hyötytuuli Oy. The Tahkoluoto demonstration and extension project will be transferred to Tahkoluoto Offshore Oy. Both companies will buy wind farm life-cycle services, such as development, construction, operation and maintenance and dismantling services from Arenso Oy. The current personnel of Suomen Hyötytuuli will be transferred to Arenso Oy.

Mr. Toni Sulameri, Managing Director of Suomen Hyötytuuli, will act as Managing Director for Arenso Oy, Suomen Hyötytuuli Oy and Tahkoluoto Offshore Oy.

”Developing, building and investing in offshore wind energy differs greatly from onshore wind projects. We will continue with our tried and tested models for onshore wind production, and the new company structure will heighten our potential in offshore wind,” says Mr. Toni Sulameri, Managing Director at Suomen Hyötytuuli.

The demerger process begins with filing the demerger plan with the Finnish Patent and Registration Office on March 8, 2024. The demerger is planned to be completed by the end of the summer 2024.


Further information:

Toni Sulameri, Managing Director at Suomen Hyötytuuli, toni.sulameri(at)

Requests for interviews: Marjut Heinonen, Communications Designer, +358 40 5540 699, marjut.heinonen[at)