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Cleantech Open 2021 Virtual Accelerator Program

For the past three years, Sunstein has been a proud sponsor of Cleantech Open Northeast. Cleantech Open Northeast is part of Cleantech Open, the world’s oldest and largest cleantech accelerator, and is managed by NECEC as the on-the-ground affiliate. Since 2005, Cleantech Open (CTO) has trained over 1,600 early-stage clean technology startup entrepreneurs through its annual business accelerator. Cleantech Open provides between 100-150 companies in the U.S. a rich program of customer discovery, extensive mentoring, training, investor meetings, startup-corporate matching, and showcasing at both the regional and national levels.

Cleantech Open Startup Accelerator 2021

This year, Cleantech Open has organized a VIRTUAL Accelerator Program that includes five months of cleantech-specific mentoring, training, resources, visibility, and access to capital to boost your startup to the next level, culminating at the CTO Global Forum event in October 2021.

All early-stage clean energy and environmental sustainability startups are welcome to apply. The Early Bird Deadline is February 28, 2021, and the Final Application Deadline is April 18, 2021.

Start your application today!

Meet the Sunstein Mentors


“I like working with cleantech companies to identify and protect their intellectual property. I’ve worried about the environment since I was a kid in the 1960s, so it’s gratifying to see these startups tackle some challenging problems with such innovative solutions.” - George J. Jakobsche, Sunstein Partner

“My experience mentoring startup companies in the clean energy industry through Cleantech Open has been incredibly rewarding. By helping participants navigate complex business and legal matters, I am playing a small part in the organization’s important mission to find and fund the most promising start-ups focused on solving critical environmental and energy challenges.” John W. Powell, Sunstein Partner




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