How we invest for impact in renewable energy

Investing in the global energy transition contributes to social and economic development and the preservation of our planet

Solid track record and in-depth sector knowledge

Over 40 years, we have financed and actively managed hundreds of renewable energy projects and businesses. From the first wind turbine in the Netherlands to the largest floating solar park in Europe and battery. Our investment teams have built up in-depth expertise in high-impact sectors and a full range of financial instruments, from pure private debt and private equity to mezzanine finance.

Sound investment strategy

The energy transition offers strong investment opportunities, driven by the need to enhance energy efficiency, expand renewable energy capacity, and modernise and expand infrastructure.

Integrated assessment optimising impact, risk and return

Guided by a thorough on-the-ground due diligence process, we assess and select companies based on impact, risk and return considerations, with a relationship-driven approach. This results in well-diversified and scalable impact investment portfolios, with attractive market-rate return profiles and low historic default rates.

Our first onshore wind investment dates back to the 1980s. Since then, we have established ourselves as pioneering investors in Energy and Climate. Our strategies are actively managed with a long-term vision, aimed at generating positive impact and risk-adjusted returns for retail, professional and institutional investors.

Our Energy and Climate team is composed of experienced fund managers and an international team of investment managers.

Sonja de Ruiter
Head of Fund Management
Sonja de Ruiter is Head of Fund Management (since 2024) and Fund Manager of Triodos Energy Transition Europe Fund (since 2023). She joined Triodos IM in May 2019 and became Head of Equity Investments Energy & Climate in 2020. Previously, she worked at ING in the energy sector in field of corporate and project finance. Sonja holds a Master degree in International Economics from the University of Groningen.
Willy Bulsink
Fund Manager
Willy Bulsink is Fund Manager of Triodos Groenfonds and Triodos Emerging Markets Renewable Energy Fund. He joined Triodos Investment Management in 2020 as Senior Investment Manager, working for Triodos Groenfonds, Triodos Emerging Markets Renewable Energy Fund and the Triodos Financial Inclusion funds. Prior to joining Triodos Investment Management, Willy worked in a similar position at FMO. Before that he worked at Kempen & Co, among others as an equity analyst. Willy holds a Master degree in Business Administration and Finance from the University of Maastricht.
Tim Crijns
Fund Manager
Tim Crijns is Lead Fund Manager of Triodos Microfinance Fund since 2019 and of Triodos Emerging Markets Renewable Energy Fund since March 2024. He joined Triodos Investment Management in 2016 as investment officer Africa. Tim started his career at Triodos in 2014 as corporate secretary to the Board of Directors of Triodos Bank, Supervisory Board and the Foundation for the Administration of Triodos Bank Shares (SAAT). Prior to Triodos he spent two years in Tanzania, setting up a vocational training project, and worked as lawyer at Clifford Chance and ING Bank. Tim holds a Master degree in law from the Radboud University of Nijmegen and a Master in business administration (Strategic Management) from the Erasmus University of Rotterdam. Tim is a member of the Board of Directors of 3Bank Serbia.
Andre d'Ursel
Associate Fund Manager
André dUrsel is associate fund manager of Triodos Energy Transition Europe Fund. André started his career at CACEIS before joining Triodos in May 2019 as a business controller before becoming an investment analyst for the listed funds specialised in renewable energy and information technology from May 2021 to September 2024. In those roles, André has acquired a broad set of skills and knowledge that allow him to effectively help managing and improving the Fund's operations. André has passed the second level of the CFA exam and holds a Master degree in finance and Investments from the Rotterdam School of management.
Michiel van Beek
Head of Project Equity
Michiel van Beek joined Triodos IM early 2021 as Sr. Investment Manager and heads the investment team since April 2024. He worked his entire professional life in the energy sector mainly as a manager or an entrepreneur. In these roles he developed several renewable energy assets throughout Europe and South Africa. Combining his knowledge of the technical, planning, contracting and financing aspects of project development. Michiel holds a master degree in Mechanical Engineering from the University of Twente and he has a business education from TSM and Insead.
Kay van der Kooi
Senior Investment Manager
Kay van der Kooi joined Triodos Bank in 2017 in Project Finance for Renewable Energy team, transferring to Investment Manager TETEF on 1 September 2022. His strategic focus is on the next steps in the energy transition; the heat transition and storage and distribution solutions. He combines financial (modeling), legal and technical experience with entrepreneurial drive and strategic problem solving to create value for investment opportunities. Additionally, Kay gives lectures on Financing the energy transition for the Energy Delta Institute business school. He holds a Master degree in Sociology and Development Studies from University of Groningen.
Sagar Thakar
Senior Investment Manager
Sagar is a Senior Investment Manager, a seasoned investment professional with over 15 years of experience in private equity, private debt and investment banking. His experience spans across sectoral themes such as energy transition, financial inclusion, nature-based solutions, and circularity. Prior to joining Triodos IM, Sagar worked as Vice President at Zephyr Peacock Private Equity, leading early-stage investments in India across financial services, food & agri and infrastructure ancillaries. Earlier, he began his investment banking career with Motilal Oswal in India. Sagar holds an MBA from Indian Institute of Management, Bangalore and undergraduate degree in Computer Science from National Institute of Technology, Trichy (India).
Gerrit-Jan Brunink
Senior Investment Manager
Gerrit-Jan Brunink is Senior Investment Manager and has been leading renewable energy investments in emerging markets at Triodos IM since he joined in 2007. In this capacity he has been on the board of several investee companies with a renewable energy focus. Before joining Triodos IM, Gerrit-Jan worked at FMO, the Dutch Development Bank, as a Senior Investment Officer in Africa and Asia for the Least Developed Countries Infrastructure Fund. He started his career at ABN-AMRO as Account Manager Global Clients in Amsterdam. Gerrit-Jan holds an MSc in Economics from Erasmus University in Rotterdam.
Marius Groenenberg
Senior Investment Manager
Marius Groenenberg joined Triodos IM in 2004 as Senior Investment Manager. His focus lies with energy efficiency and renewable energy projects, especially wind, solar and hydro, in Asia, Sub-Saharan Africa and Latin America. He has also served as advisor for several European wind and solar PV developers in emerging markets. Before joining Triodos IM, Marius worked two years at Fortis Bank Nederland as Senior Relationship Manager and Credit Analyst, and 12 years at ING as Senior Relationship Manager Business Banking. He holds Master degree from Arnhem University of Applied Sciences.
Nadine Hoeppermans
Investment Manager
Nadine Hoeppermans joined Triodos IM in 2012, working as an Internal Account Manager for the Africa and Asia team. Nadine started her career at Welten and worked on secondment at different commercial banks in The Netherlands. Prior to joining Triodos IM, she worked for the Business Banking department of the Dutch branch of Triodos Bank. Nadine holds an MSc in Development Studies from the Radboud University in Nijmegen.
Keiran Everden
Investment Manager
Keiran is an Investment Manager that brings extensive experience in the renewable energy sector from his time working in both the UK and the Netherlands. Prior to working for the fund, Keiran worked for Deloitte for nearly eight years in their Edinburgh, London and Amsterdam offices. In this role he advised public and private sector clients in Europe and the Middle East on their investments in the renewable energy sector. Keiran is a qualified Chartered Accountant with the Institute of Chartered Accountants of Scotland and holds a Bacc in Accountancy and Finance from the University of Glasgow.
Maria Christina Rabbi
Investment Associate
Johannes Reinking
Investment Associate
Johannes Reinking joined the Investment Team in February 2024. Before this role Johannes was an Analyst in the Performance Measurement Team. He joined Triodos Investment Management in 2020. Prior to obtaining his MSc. at International Business from Grenoble Ecole the Management in collaboration with Singapore Institute of Management, Johannes worked one year for a fund in New-Delhi. Besides his MSc., he holds both a Harvard Business School Certificate on Alternative Investments (2020) and a CAIA level 1 certificate (2023).
Jeremy Ruis
Investment Associate
Jeremy Ruis joined the Triodos team in early 2024 after a career in financial advisory, where he focused on capital structuring of renewable energy projects within project finance. Thanks to his experience in financial modelling, capital structuring and project management, Jeremy is able to support investment managers in keeping oversight of deals and deal flow through commercial activities, performance management and deal structuring. He holds a Master in Global Business and Sustainability from the Rotterdam School of Management, Erasmus University.
Ritika Gupta
Investment Associate
Ritika is an Investment Associate in the Project debt team, focusing on Energy and Climate in Emerging Markets. She joined Triodos Investment Management in 2021 as Internal account manager in the Private Equity team. Prior to Triodos, Ritika worked for 4 years at Natwest Group where she was responsible for supporting portfolio of PE funds and Financial Institutions with execution of debt deals and working on credit appetite and risk reports. Ritika holds an MBA from NALSAR University, India and completed CFA Level 1.

Explore the latest exciting investments and read in-depth analyses and expert interviews focused on advancing the energy transition.

Discover our impact reports, learn more about financing renewable energy in emerging markets and explore our investments on the interactive world map.

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Solid track record and in-depth sector knowledge

Sound investment strategy

Integrated assessment optimising impact, risk and return

Triodos Energy Transition Europe Fund

Triodos Groenfonds

Triodos Emerging Markets Renewable Energy Fund

Bespoke solutions

Finance for good

Find out how we made money work for positive change in 2024

Powerful potential

Financing renewable energy in emerging markets

Impact on a global scale

Find out how our investments work towards a green, inclusive and resilient economy.

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