Noora Ahonen

Senior Associate, Member of the Finnish Bar, M.Sc. (Econ.)

I advise our clients on a wide array of domestic and international tax matters. I joined Castrén & Snellman in 2021. Before joining Castrén & Snellman, I worked, among other things, as a tax specialist in the Finnish Tax Administration, as a judge of the administrative court, as tax consultant for a major auditing firm and as a lawyer at another Finnish law firm. I have, therefore, worked with a wide range of tax matters concerning both private persons as well as domestic and international organisations and gained valuable experience in handling tax matters in the Finnish Tax Administration and in the administrative courts.

In addition to my law degree, I hold a Master of Science in Economics. I have also completed court training, i.e. I have appointed as a lawyer trained on the bench.

Latest references

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
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 advised Jefferies as the sole arranger and lead manager in a transaction in which Finnfund, a Finnish development financier and impact investor, issued a EUR 100 million green bond. The 10-year bond bears interest at the rate of 3.5% per annum. The bond offering was placed to international investors, including a portion of dedicated green bond investors/portfolios. The bond represents Finnfund’s first ever green transaction and second issuance under its Sustainability Bond Framework established in September 2022. The proceeds from the issue will be used in accordance with the green project categories of Finnfund’s Sustainability Bond Framework to finance and/or refinance eligible green lending, equity investments, and mezzanine financing mainly targeting, for example, the objective of climate change mitigation and adaptation and/or environmentally sustainable management of living natural resources. Net proceeds will be allocated to eligible projects with the objective to mobilise debt capital to support Finnfund’s mission to generate lasting impact by investing in businesses that solve global development challenges. In addition, it contributes to Finnfund’s goal to foster sustainable development by providing investment opportunities for private investors. In its strategy, adopted in January 2022, Finnfund sets one of its targets to fund 50% of its investments with private capital by 2030. Mobilising private capital is key to achieving the UN Sustainable Development Goals (SDGs) in developing countries, given that the UN estimates the financing gap at USD 2.5 trillion per year. Jaakko Kangasniemi, Managing Director, CEO at Finnfund said: “Sustainable, innovative businesses and investors play an integral role in solving both global and local challenges, such as climate change mitigation and adaptation, and biodiversity loss. Capital markets are also vital in the transition away from fossil fuels. We are glad to have such a strong support for our impact investing activity and our mission to foster sustainable development and green transition.” Andrey Medvedev, Senior Vice President at Jefferies said: “We are delighted to have assisted Finnfund issuing its longest private placement to date and showcasing its innovative green projects. This deal demonstrates Finnfund’s appeal to a diversified international investor base and cements its position as a leading development financing agency.”
Case published 26.1.2024
We advised G&W Electric with its acquisition of Safegrid Oy, a leading provider of intelligent grid monitoring solutions based in Finland. The acquisition accelerates G&W Electric’s long-term strategy to integrate intelligent monitoring and predictive analytics into its power distribution portfolio, strengthening its offering to utility customers worldwide. Founded in 1905 and headquartered in Bolingbrook, Illinois, G&W Electric is a global leader in innovative power grid solutions, with a presence in over 100 countries. The company is known for advanced load and fault interrupting switches, reclosers, sensors, system protection equipment, power grid automation, intelligent grid monitoring, and transmission and distribution cable accessories. Safegrid is a Finnish technology company headquartered in Espoo, Finland. The company develops the Intelligent Grid System®, a grid monitoring solution that combines instant-on wireless sensors with advanced analytics to deliver real-time insight into grid conditions, enabling utilities to identify emerging issues, anticipate failures, and reduce outage duration across medium and high voltage distribution and transmission networks.
Case published 8.5.2026
We advised Kiwa in its acquisition of Sertio Oy, a Finnish notified body designated by the authority in accordance with the EU Regulation on in vitro diagnostic medical devices (IVDR). Sertio provides conformity assessment services in accordance with IVDR. Kiwa is one of the world’s leading testing, inspection, and certification companies, operating in over 35 countries. 
Case published 7.5.2026
We advised Metsäkonepalvelu Oy in its acquisition of the entire share capital of Junnonen Forest Oy, a Finnish timber harvesting services company, and the timber harvesting services business of Lamerit Oy. The acquisition supports Metsäkonepalvelu’s growth strategy and strengthens the company’s position, particularly in southeastern Finland. Metsäkonepalvelu is a portfolio company of A. Ahlström Oy, a Finnish family-owned industrial owner. The company provides mechanical timber harvesting services to forest companies, large private forest owners, and the public sector in Finland and Sweden. Metsäkonepalvelu Group employs nearly two hundred forestry professionals.
Case published 6.5.2026
We acted as Finnish counsel to Scanreco in its acquisition of CrossControl. Mannheimer Swartling (Sweden) acted as lead counsel for Scanreco. CrossControl, founded in Sweden, is a high-tech supplier of advanced display computers and central vehicle computing solutions for industrial vehicles and machines. Scanreco is a world leading supplier of professional radio remote control systems to international machinery, heavy equipment, and crane manufacturers. The combined group comprises approximately 600 employees and generates annual revenue of around SEK 1.4 billion.
Case published 5.5.2026
We advised the NATO Innovation Fund as lead investor on Kelluu’s EUR 15 million Series A funding round, with participation from Keen Venture Partners, Gungnir Capital, and Tesi. Kelluu is a Finnish deep tech company operating the world’s largest autonomous airship fleet. We advised NIF on this transaction alongside global law firm Latham & Watkins.
Case published 17.4.2026