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The new face of Cleantech innovation

1.2k technology startup entrepreneurs trained
1.2b Dollars Raised
3K clean economy jobs


Since 2005 Cleantech Open (CTO) has trained over 1200 early-stage clean technology startup entrepreneurs through its annual business accelerator. A majority of CTO alumni have survived the merciless technology startup "valley of death" and gone on to raise $1.2 billion and create over 3,000 clean economy jobs.

CTO's one-of-a-kind innovation ecosystem built over the last 11 years of programming spans key cleantech innovation hubs in the U.S. and globally. As a non-profit organization run largely by volunteers, there are many ways to contribute. Join our global network of innovation and together let's forge a clean and sustainable future.


Cleantech Open Northeast Welcomes 30 Cleantech Startups to Participate in the 2018 Cleantech Open Accelerator

by Beth Zonis

Emphasis on agriculture, water & waste, and information & communications technology, with a class of 30 companies, plus 6 CDP teams from across the Northeast.


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Cleantech Open Northeast Hosts 2018 Mentor Mixer

by Elise Baker

Connections were the focus of Cleantech Open Northeast’s 2018 ‘mentor mixer’, hosted by Pepper Hamilton on May 23. While founders of startups concentrated on...

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Wells Fargo Foundation Re-Upping CTO Sponsorship for 3 Yrs; CTO a Wells Fargo IN2 Channel Partner

by Emily Lundberg

Wells Fargo Foundation has been an ardent supporter of Cleantech Open since 2011. This month, Wells Fargo re-upped the company’s sponsorship of CTO for another...

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Cleantech Open Announces Startup Selections for Participation in 2018 Business Accelerator

by Jessica Smothermom

Cleantech Open announced today the selection of over 100 cleantech startups from around the country as participants in its rigorous five-month accelerator program of...

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