Cleantech Open runs the largest clean technology accelerator program in the world.

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Technology Startups


Entrepreneurs Trained


Total Dollars Raised


and/or Women

Since 2005 Cleantech Open (CTO)  has trained over 3,500 entrepreneurs from 1,800 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 $1.5 billion equity, and in recent cohorts, 39% of founder CEOs self-identified as BIPOC and/or women.

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