The world’s oldest and largest
cleantech startup accelerator.
Bringing early-stage cleantech acceleration
to emerging economies.
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.
ACCELERATOR APPLICATION DEADLINE EXTENDED TO MAY 15 FOR ALL REGIONS BUT THE NORTHEAST
by Bruce Witney
The world's first stick-on electrical sub-meter.
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A solution for upgrading your lighting system to the most efficient technology with zero upfront cost.
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