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Cleantech Open

runs the largest clean technology accelerator program in the world.

2,100+

Technology Startups

4000+

Entrepreneurs Trained

$3B+

Total Dollars Raised

76%

Teams w/BIPOC and/or Women (2024)

business accelerator

Since 2005 Cleantech Open (CTO)  has trained over 4,000 entrepreneurs from 2,100+ early-stage clean technology startups through its annual business accelerator.

A majority of CTO alumni surveyed have survived the merciless technology startup “valley of death” and gone on to raise over $3 billion equity, and in recent cohorts, 75%+ of Teams contain members who identify as BIPOC and/or women.

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innovation ecosystem

CTO’s one-of-a-kind innovation ecosystem built over the last decade and a half 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.

National Sponsors