Cleantech 50 to Watch
Explore early-stage innovators from across the globe, creating groundbreaking solutions to address some of the world’s most pressing environmental and sustainability challenges.
Explore the
Cleantech 50 to Watch Report
Cut through the noise and discover tomorrow’s gamechangers with the annual Cleantech 50 to Watch, spotlighting early-stage innovators around the globe developing groundbreaking technologies and business models poised to redefine industries.
Methodology
Our nomination process is designed to identify the most impressive early-stage high-impact solutions. We collect insights from our analysts, a global expert panel of early-stage innovation professionals, and public nominations, ensuring a balanced and comprehensive evaluation.
1. Nominations
We partner with a global network of corporates, investors, and advisors who focus on early-stage innovation to gather diverse perspectives and insights.
2. Expert-Led Evaluation
Our analysts assess companies using qualitative and impact filters, weighing all nominations by relevance.
3. A Global Selection
Nominations are supported by real market activity, performance metrics, and innovation milestones across the cleantech ecosystem. It’s not just about ideas; it’s about real-world solutions making a tangible difference.
The Numbers Behind the
2025 Cleantech 50 to Watch
CX
Countries represented on list in 2025
Companies evaluated
Total venture funding raised by 2025 Cleantech 50 to Watch companies on the list
Meet the Expert Panel Helping to Shape the Cleantech 50 to Watch
Ben Soltoff
Ecosystem Builder, Martin Trust Center for MIT Entrepreneurship
Cleantech 50 to Watch Alumni
Connect at Cleantech Forum Europe
Join us for Cleantech Forum Europe and connect with many of the companies named to the Cleantech 50 to Watch. Experience our new format—an intimate community off-site event, outside the hustle of the city, to give participants the chance to unplug and really connect with others.
Discover the Next Wave of Innovation
Early-stage pipeline of technologies and business models poised for significant market impact across industries.