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

Brookfield – EUR 1 billion holdco financing for DayOne Data Centers
We advised a leading global investment firm Brookfield, alongside a global sovereign wealth investor, on the Finnish law aspects of a EUR 1 billion holdco financing for DayOne Data Centers, a Singapore-headquartered developer and operator of hyperscale data centres. Structured as a seven-year secured holdco financing facility of €500 million, expandable to €1 billion – and secured by DayOne’s Finland platform – the financing will support the rollout of hyperscale developments in Lahti and Kouvola, providing nearly 300MW of planned capacity across Finland. The proceeds will also support DayOne’s global expansion across the EU and APAC, with flexibility to allocate to other key growth markets as required.
Case published 29.1.2026
Rabobank – Financing arrangement for Olana Energy
Castrén & Snellman acted as legal advisor to Coöperatieve Rabobank U.A. in its capacity as sole lender and hedging bank providing senior financing to Olana Energy for a Battery Energy Storage Systems (BESS) portfolio in Finland. Our advice included preparing a legal due diligence report on the projects as well as advising on the negotiation of the various finance and project agreements. Olana Energy is a management-owned fast-growing independent power producer with an international pipeline of over 1 GW. The diversified portfolio of assets ranging from 5 to 30 MW reinforces the Finnish grid at a granular level.
Case published 18.11.2025
Ministry of the Environment – Report on the promotion of circular economy aspects in public procurement
Castrén & Snellman was commissioned by the Ministry of the Environment to carry out a study on how the Circular Economy Act could be used to promote circular economy aspects in public procurement. Our report provides valuable information to the working group tasked with preparing the new Circular Economy Act. The report includes an overview of relevant strategies, action programmes and policies, a look at relevant legislation and case law, an assessment of the current state of circular economy procurement and examples of integrating circular economy aspects into public procurement from around the world. We end the report with concrete conclusions and a proposal for a new circular economy provision with justification. The proposal aims to maximise the regulation’s effectiveness and minimise any adverse side effects. The final report is available on the Circular Economy Act project’s Gateway to Information (in Finnish). The study was carried out by Anna Kuusniemi-Laine, Sanna Aalto-Setälä, Lotta Huhtamäki, Marja Ollila, Laura Vuorinen, Paavo Heinonen and Anna Ylitalo.
Case published 11.11.2025
Suomen Aurinkovoima – Financing arrangement to build solar parks
Castrén & Snellman acted as legal advisor to Suomen Aurinkovoima Oy and its owners in a financing tender process and a financing arrangement implemented with Danske Bank to secure financing for the company’s future solar park projects. Suomen Aurinkovoima, established by Oulun Seudun Sähkö, Oulun Energia, Vantaan Energia and Savon Voima, is a company focused on increasing domestic solar power. The company manages solar park projects from planning to implementation and maintenance, and its goal is to build dozens of new solar parks across Finland by 2030.
Case published 22.10.2025
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Latest insights

Article published 16.12.2025 – Environment, Energy & Green Transition Parliament approves substantial increases in tax on mined minerals
Tarja Pirinen
Mikko Alakare
Noora Ahonen

Tarja Pirinen, Mikko Alakare & Noora Ahonen

 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
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