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.

CTO BLOG

Cleantech Open Announces 2017 Startup Accelerator Participants

by Cleantech Open

Cleantech Open Announces 2017 Startup Accelerator Participants

Over 100 teams of cleantech entrepreneurs from around the country embark on a rigorous program of niche...

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Three Cleantech Trends: Corporate-funded Incubators, Partnerships, and Bold New Investment Models

by Cleantech Open

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Accelerator application deadline extended to May 15 for all regions but the Northeast

by Cleantech Open



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Apply Today to the 2017 Cleantech Open Accelerator

by Cleantech Open


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