Tero Tuomisto

Partner, Member of the Finnish Bar, LL.Lic.

I head the firm`s Banking & Finance service. I have been the lead counsel in numerous domestic and cross-border financing transactions of all types and have been responsible for negotiating and preparing documentation in several such arrangements. I am a well-recognised lecturer on financial topics in Finland and have also written several books and articles on this area. In addition to a Master of Laws degree, I have also received a Licentiate in Laws degree, which is the second highest legal degree in Finland.

The Legal 500, Chambers Europe, Chambers Global, Best Lawyers and IFLR1000 rank me among Finland`s leading legal experts.

Latest references

We advised CapMan Infra’s portfolio company Koiviston Auto Group, Finland’s largest bus operator, in a finance arrangement in which it completed an approximately EUR 300 million refinancing. The transaction consists of the refinancing of the Group’s existing senior debt and secures long-term growth financing to support the Group’s continued investments in its rapidly expanding electric bus fleet. The financing package has been provided by a group of lenders consisting of Nord/LB, ABN AMRO, Edmond de Rothschild, LBP AM and Siemens. The transaction strengthens Koiviston Auto’s funding base and provides significant flexibility to execute the company’s growth strategy focused on sustainable public transportation. CapMan Nordic Infrastructure I acquired Koiviston Auto in December 2021 to support its expansion and operational development. The Group now serves communities nationwide and is at the forefront of the transition to zero-emission public transport in Finland. It operates approximately 300 electric buses, with more than 50 additional electric buses expected to be deployed into traffic during 2026, further accelerating the electrification of its fleet. “The successful completion of this refinancing marks an important milestone for Koiviston Auto Group,” says Henrik Mikkola, CEO of Koiviston Auto Group. “The strong support from a diversified group of high-quality lenders underlines the robustness of our business and our long-term strategy. This financing allows us to continue investing in electric mobility and to provide reliable, sustainable and high-quality public transport services across Finland.” “Koiviston Auto Group plays a key role in the green transition of public transportation in Finland,” comments Ville Poukka, Managing Partner at CapMan Infra. “This refinancing significantly strengthens the company’s financial platform and enables continued investments into electric buses at scale. We are pleased to see strong lender confidence in the company’s strategy, operational performance and long-term growth prospects.”
Case published 25.3.2026
We advised Fingrid Oyj on the Finnish law aspects in the update of a EUR 3 billion Euro Medium Term Note programme (EMTN). Notes issued under the programme may be listed on the Irish Stock Exchange. Fingrid operates Finland’s main electricity transmission grid and all significant cross-border transmission connections. The main grid is the backbone of the electricity transmission network, to which major power plants, industrial plants and regional electricity distribution networks are connected.
Case published 17.3.2026
We advised Neste Corporation on the refinancing of its EUR 500 million term facility by way of two EUR 250 million bilateral term facilities provided by OP Corporate Bank plc and Danske Bank A/S, Finland Branch.  Each term facility has a maturity of three years with extension options.
Case published 25.11.2025
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
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
We advised Metsä Board Corporation on the issuance of senior unsecured green notes of EUR 200 million. The maturity of the notes is six years, and they mature on 28 May 2031.  The notes carry fixed annual interest of 3.875 per cent., and the issue price of the notes is 99.570 per cent. The notes were allocated to both Finnish and foreign investors. ‘We are delighted with the trust and interest shown by investors in Metsä Board’s first green bond. This arrangement extends the maturity of our financing and supports our strategy to grow in fibre-based packaging materials and renew our industrial operations. It also contributes to the achievement of our ambitious sustainability targets for 2030’, comments Henri Sederholm, CFO of Metsä Board. Danske Bank A/S and Skandinaviska Enskilda Banken AB (publ) acted as joint lead managers for the issue of the Notes.
Case published 27.5.2025
We advised Fingrid Oyj on the Finnish law aspects of the update of an EMTN programme and increase to EUR 3 billion. Notes issued under the programme may be admitted to trading on Euronext Dublin. Fingrid Oyj is Finland’s transmission system operator.
Case published 2.4.2025
We advised Neste as it signed a EUR 200 million bilateral green term loan agreement with Skandinaviska Enskilda Banken AB (publ). The proceeds of the loan will be used to finance eligible assets and projects in accordance with Neste’s Green Finance Framework. The loan has a tenor of five years. Neste published a renewed Green Finance Framework in February 2024 to align future financing activities with market best practices and standards. In addition to renewable and circular solutions, Neste’s renewed framework includes renewable energy as an investment category. Longer term actions on Neste’s climate roadmap include scaling up new technologies and innovations, with focus on renewable hydrogen. Renewable hydrogen and other new technologies are estimated to have a reduction potential of 20% or more of the 2019 scope 1 and 2 emission baseline by 2030.
Case published 21.2.2025