About us

Perpetual Next

Perpetual Next upgrades organic residues to the highest quality sustainable raw materials, fuels and (semi-finished) products. From food waste to biogas. From paper sludge to sustainable heat. From pruning waste to high-grade carbon. We work exclusively with low-grade, regional, organic residues to minimize the impact on the environment.

This is an opportunity to get returns from organic residues and to reduce waste and pollution. At the same time, it reduces the demand for and dependence on fossil fuels. The future is now. The future is Perpetual.

Our team

Martijn van Rheenen


Before Martijn van Rheenen became CEO of Perpetual Next, he was the founder and CEO of Momentum Capital. Momentum Capital has established several international companies, including companies in the energy and infrastructure sectors, with a combined value of around €475 million. In 2012, Martijn initiated the first investments in upgrading organic residual flows. He oversaw the founding of several companies in this sector, which now have ten production facilities in Europe. These activities were merged into Perpetual Next in 2019 and 2020.

Erik Huis

Chairman of the Board of Directors

Erik Huis has over 25 years of international experience (US, EU, Russia, Middle East, and Asia) as an entrepreneur in the fossil energy sector (including General Electric and Shell) with a focus on industry & technology. In 2012, he joined forces with Momentum Capital to build a sustainable energy portfolio, which would eventually become Perpetual Next. Erik obtained an MBA from Fox School of Business, Temple University, Philadelphia, USA.

Rene Buwalda


25 years ago, Rene's career began in the power generation sector. He worked in senior positions in development, engineering, and production facilities and later as a senior project manager and project director in several complex international energy projects. Rene is a natural leader in multidisciplinary teams and uses his strategic thinking to implement successful and ambitious projects with partners.

Albert Fischer

Sr. Advisor to the Board

Albert Fischer is passionate about promoting sustainability by building young and innovative businesses. He has over 25 years of experience in venture capital and management in the Netherlands, the United Kingdom, and Switzerland. Over the course of his career, he has invested in 22 companies that focus on sustainability and clean energy. Albert obtained a PhD in physics from the University of Leiden and followed executive education courses at the Amsterdam Institute of Finance and IMD Lausanne.

Eija-Riitta Korhola

Sr. Advisor to the Board

Dr. Eija-Riitta Korhola (former Member of the EU Parliament) has more than 15 years of experience in European legislation on energy, climate, environment, and the internal market. She worked as a visiting senior fellow at Tsinghua-Brookings (Beijing), as a delegate of the Advisory Committee on Industrial Change to the European Economic and Social Committee, and is a member of the Steering Committee of the Japanese Climate Initiative Innovation for the Cool Earth Forum.

Maarten Gnoth


Maarten (MSc) is a driven manager with 20 years of international experience. Maarten is experienced in M&A, finance, and joint venture development in the fields of international business development, sustainability, and consultancy in renewable energy. He is also an expert in converting organic waste streams to energy, bio supply chain management, organic waste (wood and agricultural residues) pelletization, and environmental and social responsibility within the energy sector.

Dennis Krispijn


Dennis (MSc) is an all-round CFO with a technical background and approximately 18 years of international experience at technology-driven companies within the energy sector. He comes over from Yokogawa Electric and previously worked for 15 years in various positions for Exxon-Mobil and Shell. Dennis has a broad financial experience, accompanied by a hands-on attitude plus experience in coaching teams.

Martijn Dekker


Martijn supervises the maturity phase of the unique technology for the torrefaction of organic waste. Martijn received a PhD in theoretical physics. After a series of technical management and CEO positions in the lighting industry, he is excited to contribute with the Perpetual team to the world’s transition to renewable energy by ramping up to industrial scale this proprietary technology for producing biocoal from organic waste.

Marcel Verhoeven

Chief of Staff

Marcel serves as the Chief of Staff of Perpetual and is responsible for the internal affairs. He is heading the Executive Committee and will plan and direct all administrative, financial, and operational activities on behalf of the CEO. Marcel has worked in several Sr. Management and Executive roles, where he successfully built up organizations from scratch and transformed existing organizations to suit new business needs.

Joost Oostveen

Corporate Communications

Joost (MSc) has over 25 years of experience in developing and implementing marketing and sales strategies in the financial services industry and utilities. Joost co-developed and realised the strategy for a large Dutch utility company to enter the German market. He worked directly for the Board of one of the largest insurance companies worldwide. From 2008 on Joost started working for Momentum Capital. Recently he became responsible for Corporate Communications at Perpetual Next.

Ramón Boekhoff

Corporate Finance

Ramón works to capitalize on unique opportunities that make a real contribution to our society. He started his career as an investor on the Amsterdam stock exchange in 1987. He then progressed into asset management and afterwards to Capital Markets at Momentum Capital. He is currently responsible for Corporate Finance at Perpetual Next and plays a key role in achieving success for investors.

Martijn van Kleef

Corporate Finance

Martijn van Kleef has a broad background and over 15 years of experience in banking and asset management. Combining his analytical skills with his knowledge of investing he has a positive yet critical attitude and is always looking for opportunities while remaining aware of the common interest. Martijn (MSc) studied business economics at the University of Amsterdam and followed various investment programs.

Meity van der Stokker – Heesbeen

Assistant to the Executive Committee

Over the years, Meity has worked to develop her skills in different sectors and roles. She has gained broad knowledge and experience and is therefore able to anticipate the needs of different levels in the organization. She likes to maintain contact with people and enjoys making sure things are well organized, clear communication, and working on improvement and efficiency.