If you have any questions, please check out our application FAQs here.


We find, fund, and foster the most promising cleantech startups on the planet.


Cleantech Open is...

the oldest and largest cleantech startup accelerator program, with the mission to find, fund, and foster entrepreneurs with ideas to solve our greatest environmental and energy challenges. Through our annual business competition and accelerator program, we connect cleantech startups with the people and resources that will accelerate their success, and provide a national platform for public visibility.

Cleantech Open Northeast History

Cleantech Open Northeast was founded in 2005 as the Ignite Clean Energy program by the Energy Special Interest Group (ESIG) of the MIT Enterprise Forum. At the beginning, with less than 30 teams applying and a huge outpouring of community, business, academic, and volunteer enthusiasm, the program initially focused on student entrepreneurship at MIT and then expanded rapidly to the larger community. In 2010, Ignite expanded its reach and impact by joining forces with the national organization Cleantech Open creating the largest cleantech innovation footprint in the country. Shortly after its inception, Cleantech Open Northeast (CTONE) entered an affiliate agreement with the Northeast Clean Energy Council (NECEC). As part of this agreement, NECEC provides office space and visibility, in exchange for CTONE helping to promote NECEC’s interests and creating a pipeline for potential new members for NECEC.

Cleantech Open Northeast Covers...

Massachusetts, Vermont, Maine, Connecticut, Rhode Island, New Hampshire, New York, Pennsylvania, New Jersey, and Eastern Canada. We are proud to be a central part of the highly unique and productive regional cleantech ecosystem: we work with partners all over our two regions to support the growth of innovative startups coming out of our tremendous research institutions and the business community.

Meet the Northeast staff

WE ARE HIRING! 2021 Summer Innovation Intern

Meet the 2020 Cleantech Open Northeast Cohort

Congratulations to the 2020 Northeast Regional Winners, Finalists and Runners-Up!

In 2020, the following teams were recognized at the 2020 Northeast Regional Finals: The 2020 Northeast Winners, Finalists and Runners-Up all pitched live at the 2020 Cleantech Open Global Forum. CLIP and Polycarbin were selected as 2020 National Finalists. 

2020 Northeast Regional Winners

Andluca Technologies



T-Omega Wind

2020 Northeast Regional Finalists

Atrevida Science


2020 Northeast Regional Runners-Up

Harmony Desal


Cleantech Open Northeast is effective, thriving and diverse

Learn more about the Northeast Region from our 2020 Impact Report


                Sebastien Mannai, Founder of Acoustic Wells 

                    (formerly Acoustic Diagnostic System)

Alicia Barton, former President of NYSERDA 

Check out the CTONE YouTube page for alumni testimonials, startup videos, and more!

Get to know NECEC, the Northeast Regional Affiliate

NECEC is the Northeast regional affiliate for Cleantech Open. NECEC executes the Cleantech Open Northeast accelerator and business plan competition in Massachusetts, New York, Maine, Vermont, New Hampshire, Connecticut, Rhode Island, New Jersey and Pennsylvania and builds the region’s innovation network for Cleantech Open and NECEC’s successor program for cleantech entrepreneurs Cleantech Navigate Northeast. Cleantech Navigate Northeast program helps better connect accelerator participants and alumni with financiers, strategic partners, and early adoption customers. Learn more about NECEC and its programs to help clean energy businesses start, scale and succeed in the Northeast at: http://www.necec.org/Stay connected to the cleantech ecosystem by subscribing to NECEC's Northeast Innovation Newsletter below.

This calendar is a collection of public events in the northeast clean energy ecosystem. 

Events for the 2020 accelerator will be invite-only to your email, if appropriate.