Notable Alumni

Stay up to date with the latest CTO Alumni achievements!

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Cleantech Open has been in operations for more than 15 years, and in that time has seen countless incredible startups complete our program and move on to even greater successes. We are so proud of where our Alumni have gone, and the accomplishments they have reached. Here we have created a consolidated place to track big news from our previous startups. We love to see them doing well and want to share this information with our network when we can. If you are an Alumni and would like to submit an update on Twitter, use the hashtag above #CTOAlumniSuccess. If you're not on Twitter, please email your updates and any supporting links to

Alumni Highlights


Region: Northeast

Year completed CTO: 2016

Our goal is to make EV ownership easy by partnering with businesses to create the world’s first mobile and intelligent on-demand EV charging infrastructure. We are making energy accessible by partnering with companies to create an EV charging network, thus democratizing energy around the world. We want to accelerate the adoption of electric vehicles on a global scale. Creating a cleaner, healthier, safer, and more sustainable world.

Radical Plastics

Region: Northeast

Year completed CTO: 2018 Grand Prize Winner!

This innovation journey phase is based on the identification, selection and testing of innovations that are developed by individuals or organizations outside of your company. External calls can take the form of Accelerator programs, Calls for Startups, Tech Scouting, Corporate Venturing  and Joint Projects. The selected innovations will be provided with funding and support for testing and evaluation.


Region:  Northeast

Year completed CTO: 2019 Grand Prize Winner

AeroShield Materials is making the next generation of energy-efficient windows possible by manufacturing super-insulating aerogel sheets. AeroShield’s material is designed to drop inside existing double-pane manufacturing to create a window 50% more insulating – reducing energy use and improving comfort. Developed by the founders at MIT, this patent-pending porous glass offers state-of-the-art performance in a lightweight and affordable form-factor. AeroShield is part of the Wells Fargo Innovation Incubator, the Activate Boston, MA 2020 cohort, and featured in Forbes 30 Under 30: Energy.

Natel Energy

Region: Northeast (now in Alameda, California)

Year completed CTO:  2005

Natel Energy is a California-based company with a mission to mitigate climate change and build climate resilience by providing hardware and software solutions that enable a 100% renewable grid via a hydropower backbone. Climate change is water change, and hydropower is situated at the confluence of climate mitigation and adaptation. Hydropower is a crucial component of a low-carbon, renewable grid because of its reliability, flexibility and complementary generation characteristics to wind and solar. Hydropower projects are also integrally dependent upon and have substantial impact on watershed function. Natel’s solutions address cost, operations and environmental performance challenges at the heart of unlocking additional sustainable, reliable hydropower generation – both from the existing fleet and from new project development.

Flux Marine 

Region:  Northeast

Year completed CTO: 2019 National Grand Prize Runner Up, People’s Choice Winner, Best in Showcase

Flux Marine is developing high performance electric marine propulsion systems that are maintenance free and silent. They offer outboards from 15-150HP and complete boat packages.


Check out this great news on funding!

Region: Northeast

Year completed CTO:   2013

BlocPower is a Brooklyn-based energy technology startup rapidly greening American cities. Since its founding in 2012, the company has completed energy projects in nearly 1,000 buildings and delivers results ahead of schedule and under budget. BlocPower utilizes its proprietary software for analysis, leasing, project management, and monitoring of urban clean energy projects and its customers are saving 20-40% on their energy bills each year. The company is backed by the world’s top investors, including Kapor Capital, one of Uber’s first investors, Andressen Horowitz, early investor in Facebook, Twitter, AirBnB and Lyft, the former Chairman of Google, and American Family Insurance Institute for Corporate and Social Impact.