15.5.2025

Latest regulatory developments for renewable energy in Finland

The Finnish government has introduced a proposal (HE 42/2025) to amend the Act on expedited permit procedures for renewable energy power plants (1145/2020). The reform would extend the scope of the Act to renewable energy production facilities that use only renewable energy as their energy source. However, it remains unclear which types of facilities would be covered and whether, for example, hydrogen facilities would be included. 

Key highlights of the proposal include

1. Binding Deadlines: The reform extends the range of binding deadlines for permit procedures to accelerate renewable energy investments. For example, the duration of permitting for the installation of solar energy equipment with a maximum capacity of 11 kilowatts may not exceed one month. The duration of permitting for renewable energy production facilities with a capacity of less than 150 kilowatts located on land areas may not exceed one year, and for facilities with a larger capacity, two years. In renewables acceleration areas, these deadlines are six months and one year, respectively.

2. Renewables Acceleration Areas: Designation of special areas for accelerated renewable energy development, initially focusing on solar energy. The upcoming Finnish Supervisory Agency will designate renewables acceleration areas based on proposals from municipalities.

3. Streamlined Processes: Shorter permit processing times and potential exemptions from environmental impact assessments (EIA) and Natura evaluations in designated acceleration areas. An exemption could only be granted in an area where the introduction of a specific form of renewable energy is not expected to have significant environmental impacts. In addition, the measures to mitigate adverse environmental impacts set out in the decision designating the area must be complied with. Only certain types of projects, such as wind farms, are eligible for exemption.

4. Enhanced Coordination: Strengthening the role of the upcoming Finnish Supervisory Agency should ensure smooth permit processes. The proposal to expedite permitting of renewable energy projects is a part of a broader a one-stop shop reform which aims to combine regional administrative units under the upcoming Finnish Supervisory Agency.

This proposal aims to foster a more efficient and supportive environment for renewable energy projects, aligning with the goals of the RED III directive. The legislation is intended to enter into force at the same time as the legislation on the reform of regional administration, i.e. on 1 January 2026.

Looking for guidance? Our expert team in environment, energy and the green transition is happy to help.

Latest references

We advised Oomi Solar Oy on the sale of a solar power park and battery energy storage project to Tuulipolar Oy. The transaction concerned a 24 MWp solar power plant and a 36 MW / 70 MWh battery energy storage system (BESS) to be constructed in Tornio. Tuulipolar Oy will act as the owner and operator of the plant, while Oomi Solar Oy will be responsible for its design and construction. The project will form the world’s northernmost industrial hybrid power plant, contributing to Finland’s green energy transition by increasing renewable energy production and electricity storage capacity in Northern Finland. The hybrid solution enables optimization of production as well as active participation in electricity markets and reserve services, improving the project’s profitability and supporting the balance of the electricity system year-round. Electricity production from the hybrid plant is expected to begin in 2028. Oomi Solar Oy is a Finnish renewable energy expert with experience from nearly 200 MW of installed solar capacity. The company helps businesses and communities accelerate the green transition by offering comprehensive solutions, including solar power plants, energy storage systems, and related lifecycle services from project development to maintenance. Oomi Solar Oy employs more than 20 energy professionals and delivers solar power projects across Finland. The company’s vision is to be Finland’s most desired partner for solar energy and energy solutions.
Case published 5.6.2026
Castrén & Snellman advised Nscale, a European AI infrastructure company, in connection with its planned data centre project in Harjavalta, Finland. The facility will be located in the Sievari industrial area. Castrén & Snellman’s advisory role encompassed the negotiation and execution of a site securing and development agreement (SSDA) with Fortum, as well as the preliminary land sale process for the Sievari site with the Town of Harjavalta. Under the SSDA, Fortum supports the advancement of Nscale’s project development, including grid connection design and permitting.
Case published 15.4.2026
We advised UK-based investment company Downing in its acquisition of the entire share capital of Tornionlaakson Voima Oy. Tornionlaakson Voima owns three hydropower plants in the Tengeliönjoki river system – the Portimokoski power plants in Ylitornio, the Jolmankoski power plants in Raanujärvi and the Kaaranneskoski power plants in Sirkkakoski. The power plants produce a total of approx. 45 gigawatt-hours of electricity per year. Tornionlaakson Voima’s daily operations will continue normally, and the transaction will not affect customers. The consummation of the transaction is subject to the approval of the Ministry of Economic Affairs and Employment. Downing has over 35 years’ experience in providing a wide range of investment solutions to the needs of institutional investors, advisers and retail investors. The company manages over £2 billion in assets in both the private and public markets and its current hydro power portfolio includes approx. 50 hydro power plants in the Nordics. 
Case published 27.3.2026
Castrén & Snellman successfully assisted Terrafame Ltd in environmental and water management permit processes concerning the company’s entire operations and the KL1 side rock area, on which the Supreme Administrative Court issued its decision on 12 February 2026 (KHO 366/2026 and 367/2026). The changes made to the decisions of the Vaasa Administrative Court as a result of Terrafame’s appeals, enable the company to implement its new strategy and develop its operations as planned. The decisions of the Supreme Administrative Court brought the nearly ten-year-long permit process to a close.
Case published 20.2.2026