The list spotlights the early-stage companies poised to deliver breakthrough solutions to the world’s most pressing climate and sustainability challenges. Selected from hundreds of nominations worldwide, the 50 companies represent the most compelling innovators at the intersection of technology, business, and impact.
This year’s Cleantech 50 to Watch emerges against a backdrop of heightened geopolitical and economic uncertainty. Global tariffs, policy reversals, and development bottlenecks continue to reshape project timelines and investment flows. Yet, even amid these headwinds, a new generation of entrepreneurs is redefining what is possible—accelerating advances in clean energy, sustainable materials, food and agriculture, and digital-enabled climate solutions.
“As we’ve seen throughout 2025, innovation doesn’t stand still,” said Anthony DeOrsey, Research Manager at Cleantech Group. “These 50 companies represent where the market is heading next: increasing sophistication of AI, new frontiers in resource resilience, and breakthrough solutions in consumer goods sustainability. Their work shows us not just what’s possible, but what’s urgently needed.”
At the beginning of the year, Cleantech Group introduced a “Grow, Flow, Slow” framework to identify which technologies are likely to accelerate, advance steadily, or encounter significant headwinds. Updated throughout the year, the framework continues to highlight the dynamic forces shaping cleantech markets.
Within this framework:
Areas of Focus/Innovation
The Importance of Ecosystems
The 2025 Cleantech 50 to Watch also highlights the role of innovation ecosystems in supporting early-stage growth. Regional accelerators, public agencies, and venture platforms—including SGInnovate (Singapore), Innovate UK, and Greentown Labs (Massachusetts)—are playing a critical role in helping start-ups access markets, partners, and capital.
Looking Ahead
This year’s honorees reflect the cleantech sector’s resilience and ingenuity in the face of global uncertainty. From AI-driven breakthroughs to novel approaches in recycling and agriculture, the Cleantech 50 to Watch demonstrates that innovation continues to push boundaries, even in turbulent times.
“We congratulate all 50 companies recognized this year,” said DeOrsey. “Their progress shows that the path to a low-carbon, resource-efficient future is not only alive but accelerating in unexpected and exciting ways.” Download your complimentary copy of the 2025 Cleantech 50 to Watch list and supplementary report here: https://www.cleantech.com/50towatch/
About Cleantech Group
Cleantech® Group is the human intelligence authority on global cleantech innovation. By blending our intelligence, proprietary data, and the global network we’ve cultivated for more than 20 years, we deliver insights you can trust and guidance you can act on.
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