About Us

We help you to grow your clean technology and renewable energy business


We are a global team of Commercial and Investment Bankers, CPAs, Lawyers and Engineers

As an independent corporate development and corporate finance advisory firm, CleanTech Capital has formed very experienced and effective core team that will be supplemented by highly qualified experts from different areas.

CleanTech Capital has a strong network of advisors, entrepreneurs and investors throughout Europe, North America, South America, the Middle East and Asia and cooperates with leading law firms, accounting firms and financial institutions around the world.

Dr. Winfried Weigel

Founder, Head Europe

Winfried Weigel is an experienced investment banker with a track record of landmark transactions in mergers and acquisitions, capital markets, project finance and private equity. He served as Managing Director for UBS in Zurich and Frankfurt, as Executive Director for UBS Warburg in London, and as Vice President for J.P. Morgan Chase in New York and London before starting his own entrepreneurial activities. Winfried holds a PhD in Economics (Capital Markets Theory), a MBA in Business Administration (Majors in Accounting, Tax and Banking), a LL.M. (Corporate and Capital Markets Law) and a B.Sc. (majors IT & OR).

Gustavo Weigel

CPA, Head South America

Gustavo Weigel is Head of the South America region for CleanTech Capital. With more than 25 years of international professional experience, he focuses on M&A transactions, business valuation, investment projects and finance structuring. He has been involved in many international transactions between Latin America countries in ports, logistics, agribusiness, renewables, real estate industries, financial, insurance and beverage industries. Gustavo founded his own corporate finance business, Weigel Haller, in 2000. Gustavo worked at accounting firms Coopers & Lybrand and Price Waterhouse and several multinational companies where he held management and board of director positions. Gustavo holds a CPA degree from the University of the Republica Oriental del Uruguay and has completed post-graduated business executive studies in Universidad de Montevideo.

Rosana Bomba

South America, Chief Operating Officer

Rosana Bomba holds a CPA degree from the University of the República Oriental del Uruguay and a post-graduate in Corporate Finance from the Catholic University of Uruguay. She has more than four-teen years of professional experience, previously to joined the Firm she worked for Deloitte. Rosana is highly knowledgeable in M&A deals, company valuations and investment projects development mainly in the logistics and agribusiness sectors.

Geoffrey I. Marney

Head North America

Geoff Marney joined CleanTech Capital in 2008 and runs our North American office as Managing Director of CleanTech Capital North America. Geoff brings a wealth of experience in international cleantech and green technologies transactions. He brings Wall Street and Bay Street expertise to environmentally focused business owners. After working with leading firms such as NBTel, Aliant Telecom as well as a number of technology joint ventures with Nortel Networks and Bell Canada, Geoff joined an investment banking group based on Bay Street, Toronto and eventually founded Pathpoint Capital Partners. Geoff holds a BSc from DeVry University with a major in operations research and a minor in accounting.

Matthias Retter


Matthias dedicated his career to environmental finance and water where he has gained over 12 years of experience in investment management, management consulting, engineering and research. He is recognized by value adding assignments to institutional investors, banks, export credit agencies, corporates and the private and public sectors. He previously had been a global leader of the sustainable water management hub at PricewaterhouseCoopers (PwC), which he built up and managed it for years.

His professional overview earned him invitations for key notes at conferences and UN meetings, but also media reviews from Handelsblatt, FAZ, L’Express France or Les Echos France. Co-contributions to water projects were also awarded by the White House in Washington under president Barack Obama as Top 1 private sector innovator.

In addition, Matthias drives education towards a sustainable world for next generation decision makers by lecturing at the Copenhagen Business School and the Vienna University of Economics and Business.

Will this be you?

If interested, please email your CV to: my.job@cltcap.net
We staff our projects to your needs and we bring in additional industry experts as needed for the project.