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 Accelerator Program Announces Top Cleantech and Energy Startups of 2017

by Gina Bellato

Cleantech Open’s East Coast Academy Held at Federal Reserve Bank of Boston

by Ian Donnelly

Cleantech Open Northeast Welcomes 2017 Cohort

by Gina Bellato

Cleantech Open Northeast Matches Mentors to Startups at the 2017 NYC Mentor Mixer

by Elise Baker

Northeast Sponsors