23.9.2021

The Time for Offshore Wind Farms Approaching in Finland – Hundreds of Turbines in Development

Onshore wind power has solidified its place as a form of electricity production in Finland. In contrast, there is currently only one offshore wind power plant operating in Finland, located in Tahkoluoto, Pori. The most significant obstacle to offshore wind power is generally considered to be weaker profitability than onshore wind power. There are plans in Finland to accelerate the construction of offshore wind farms, for example, by lowering the real estate tax rate.

The political will to increase the adoption of offshore wind power is clearly present. In November 2020, the European Commission published the EU Strategy to harness the potential of offshore renewable energy for a climate neutral future. The goal of the strategy is to increase offshore wind power capacity to at least 60 gigawatts (GW) by 2030 and then to 300 GW by 2050. This would be a 25-fold increase of the current 12 GW capacity over the next 30 years.

Finland is also seeking to increase the adoption of offshore wind power. According to Prime Minister Sanna Marin’s government programme from 2019, the government will seek to improve the prerequisites for the construction of offshore wind farms and ultimately increase implementation in order to achieve the goal of nearly emission-free production of electricity by the end of the 2030s. According to Finland’s sustainable development programme published in 2021, a total of 161 million euros will be directed to investments in new energy technology, such as offshore wind power. The funds will come from the EU’s recovery package.

Lower Real Estate Tax Would Improve Profitability

One example of a concrete measure to promote offshore wind power is the planned reduction of the real estate tax for wind power. Currently, the replacement cost is 75% of the construction costs for both offshore wind farms and onshore wind farms. In practice, offshore wind farms nevertheless pay significantly more real estate tax than onshore ones. This is because offshore wind farms involve demanding foundation work and other construction costs, which means that the taxation values that form the basis for real estate tax are higher than for onshore wind farms.

The Ministry of Finance has prepared an amendment to the real estate taxation so that the replacement cost of offshore wind farms would include a smaller amount of the construction costs. The intent here is to place onshore and offshore wind power on equal footing with respect to real estate tax.

Significant Potential in the Baltic

The regional councils of Finland’s coastal municipalities approved the first maritime spatial plan for Finland’s territorial waters and exclusive economic zone at the end of 2020. Finland’s Maritime Spatial Plan 2030 is not legally binding, but does identify, among other things, potential areas for the development of offshore wind power. According to the plan, the Baltic Sea has significant potential with respect to offshore wind power. This potential is greater in Finland’s coastal regions compared to other Nordic countries. The Gulf of Bothnia, in particular, has been identified as being well suited to extensive offshore wind power construction.

There are numerous offshore wind power projects currently being developed in Finland. For example, a large-scale offshore wind farm is being planned in Åland, with LUT University studying options for moving forward. The government of Åland is planning as many as 500 offshore wind turbines with a total nominal capacity of 6 GW in an area of approximately 1,000 square kilometres. The planning and preparatory phase is estimated to continue into 2024.

Territorial Waters or Exclusive Economic Zone?

The authority processes required for offshore wind power projects, such as permitting processes, differ slightly from onshore wind power projects. For example, offshore wind farms require a water permit in accordance with the Water Act. The authority proceedings for offshore wind farms also differ according to whether the wind farm is going to be constructed in Finnish territorial waters, which are closer to the coast, or in the exclusive economic zone, which is farther out to sea.

In territorial waters, wind farms require, among other things, a zoning plan that allows wind farms as well as building permits, just like for onshore wind farms. In contrast, the exclusive economic zone is not subject to land use planning and no building permits are necessary for wind turbines in the exclusive economic zone. However, construction in the exclusive economic zone requires an exploitation right and consent to construct in the exclusive economic zone granted by the Finnish government and may also require, among other things, an environmental impact assessment process.

There is a very strong will in Finland to significantly increase the adoption of offshore wind power, and the practical implementation of projects requires versatile legal expertise. Castrén & Snellman has assisted clients in the permitting of major projects in the Finnish exclusive economic zone. Our firm also has extensive experience of wind power projects, most recently the development and sale of the Puskakorpi wind farm project

Latest references

We are acting as the joint legal advisor to Oomi Oy and Lumme Energia Oy in a transaction whereby Lumme Energia will merge with Oomi. As from the completion of the merger, the combined entity will be the largest electricity retail and service company in the Finnish market. In 2024, Oomi reported a turnover of EUR 373.9 million and had approximately 110 employees. Lumme Energia’s turnover for the same year was approximately EUR 314.6 million and it had approximately 50 employees. The transaction is primarily driven by the recent developments in the electricity market and the strategic goal to develop competitive products and services. Another key objective is to further enhance the customer experience, which is a shared value between the two companies. As a result of the merger, Lumme Energia’s customers will transfer to Oomi, and Lumme Energia will become one of Oomi’s shareholders. The completion of the transaction is subject to an approval by the Finnish Competition and Consumer Authority.
Case published 29.8.2025
We assisted Oomi Oy in its expansion into the mobile telecommunications market with the launch of Oomi Mobiili, a new MVNO brand. Our work covered the preceding due diligence process as well as structuring and negotiating key partner agreements, laying a solid foundation for Oomi’s entry into the new market. Oomi Mobiili will operate as a virtual mobile network operator, offering customers the option to purchase a mobile subscription together with their electricity contract. The phased launch is set to begin in autumn 2025, with nationwide availability targeted for early 2026. 
Case published 15.8.2025
We advised Nevel Oy in its acquisition of the business of Labio Oy. Lahti Aqua Oy and Salpakierto Oy sold their entire shareholdings in Labio to Nevel, expanding Nevel’s already significant biogas portfolio. The transaction will have no impact on Lahti Aqua’s water utility operations or Salpakierto’s municipal waste management responsibilities. Labio’s operations and customer relationships will continue as before. ‘This partnership is a natural next step for us as we continue investing in sustainable material efficiency and renewable energy solutions. By integrating Labio’s comprehensive offerings and expertise, we can provide customers with a strong platform for material circularity. We are also strengthening our market position as one of Finland’s leading material efficiency solution providers,’ says Ville Koikkalainen, Director of Industrial and Biogas Business at Nevel. Nevel is an energy infrastructure company offering advanced, climate-positive solutions for industry and real estate. It operates more than 130 energy production plants and manages over 40 district heating networks. Nevel’s annual turnover is EUR 150 million, and it employs 190 experts in Finland, Sweden and Estonia.
Case published 16.7.2025
We advised Oomi Solar Oy on the sale of a 250-megawatt solar power project portfolio to Suomen Aurinkovoima Oy. The portfolio consists of ten separate projects, marking a significant development in the Finnish solar energy market and enabling over EUR 100 million in investments. Construction of the first projects is expected to commence as early as 2025, with sites located across various regions of Finland.
Case published 30.5.2025