Environment, Energy & Green Transition

Environment, Energy & Green Transition

Castrén & Snellman is recognised as a leader for energy and infrastructure work in Finland. Its strength is apparent across the board.

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We advise our clients in environmental and energy law as well as in green transition projects. 

We handle your project’s permitting and appeal processes on your behalf. Drawing on our strong industry knowledge, our experts will help you in developing green transition projects and drafting related contracts. We support you in all legal issues in the energy market.

We manage the ever-changing regulatory landscape of environmental and energy law on your behalf. We monitor EU regulatory developments to anticipate regulatory changes affecting your business. We act as your strategic speaking partner in project development and on environmental and energy law issues.

The green transition is gathering pace and creating significant new business and growth opportunities for businesses. As an adviser in environmental and energy law, we help clients in identifying and seizing the opportunities presented by the energy transition.

Latest references

Merger of Oomi and Lumme Energia
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
Oomi  – Expansion into mobile telecommunications
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
Nevel – Acquisition of Labio’s business
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
Oomi Solar – Sale of solar power project portfolio
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
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Latest insights

Article published 2.10.2025 – Environment, Energy & Green Transition Fingrid extends restrictions on new energy storage facility connections in Southern Finland until 2029
Konsta Peussa
Marius af Schultén

Konsta Peussa & Marius af Schultén

 Article published 25.6.2025 – Tax & Structuring Administrative Court ruling: the Profit Tax Act targeting electricity companies is in conflict with EU law
Janne Juusela
Mikko Alakare
Samuli Tarkiainen
Anette Laitinen
Noora Ahonen
Joakim Nivala

Janne Juusela, Mikko Alakare, Samuli Tarkiainen, Anette Laitinen, Noora Ahonen & Joakim Nivala

 Article published 15.5.2025 – Environment, Energy & Green Transition Latest regulatory developments for renewable energy in Finland
Marius af Schultén
Konsta Peussa

Marius af Schultén & Konsta Peussa

 Article published 7.4.2025 – Private Equity Tax credit for major clean transition investments passed in Parliament – application period until 29 August 2025
Janne Juusela
Mikko Alakare
Samuli Tarkiainen
Marius af Schultén
Jarno Tanhuanpää
Kanerva Sunila
Noora Ahonen

Janne Juusela, Mikko Alakare, Samuli Tarkiainen, Marius af Schultén, Jarno Tanhuanpää, Kanerva Sunila & Noora Ahonen
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