About Cleantech Open
Cleantech Open, an accelerator and incubator program founded in 2005, is based in Los Angeles, United States. With a presence in 5 countries, it has supported around 77 startups in sectors like Environment Tech, High Tech. As of Oct 2026, Cleantech Open has witnessed 3 portfolio exits. Most notable companies in
its portfolio include Noon, Princeton NuEnergy and Flux Marine. The program is backed by a team of 27 people who primarily support Grant (prize money) startups based in United States. Its latest investment was a $7M Seed round in Princeton NuEnergy on May 11, 2022, which also saw participation from Wistron and Shell Ventures.
Key Metrics
Founded Year
2005
Location
Los Angeles, United States
Portfolio Companies
Sectors of Investment
Stages of Investment
Grant (prize money) & Seed
Locations of Investment
Cleantech Open's List of Top Investments
Cleantech Open has a portfolio of 77 companies. Their most notable investments include Noon and Princeton NuEnergy.Their portfolio spans across United States, Canada, China and 2 more locations. They have invested in Environment Tech, High Tech, Energy Tech and 19 other sectors, across stages such as Grant (prize money), Seed stages. Here is the list of top investments by Cleantech Open:
1. Noon
Provider of solutions for flow batteries. Its battery solutions allow users to store renewable energy from solar and wind energy sources at a low cost.
Key facts about Noon
- Founded Year: 2018
- Location: Palo Alto (United States)
- Stage: Series A
- Total Funding till date: $31M
- Employee Count: 76 as on Aug 31, 2026
- Investors: Mistletoe, Collab Fund and 14 Others
- Latest Funding Round: Grant (prize money), Nov 15, 2023, $*****
- Highlight: Editors' Pick
Key facts about Princeton NuEnergy
- Founded Year: 2019
- Location: Bordentown (United States)
- Stage: Series A
- Total Funding till date: $63.3M
- Employee Count: 37 as on Aug 31, 2026
- Investors: WorldQuant Ventures, Samsung Venture Investment and 19 Others
- Latest Funding Round: Grant (prize money), Jul 07, 2025, $*****
3. Flux Marine
Electric boating: Revolutionizing marine propulsion with sustainable, powerful systems. They design and build electric propulsion systems, partnering with hull manufacturers to deliver a better boating experience. Their systems improve every aspect of boating, from the all-electric outboard to supporting technology. They offer recreational boats like dual consoles, center consoles, and pontoons. They are revolutionizing marine propulsion to be more powerful, efficient, sustainable, and enjoyable. They are looking for passionate individuals to push the boundaries of electric propulsion and contribute to a cleaner marine industry. They offer electric outboards, electric motors, and electric propulsion technology. They are advancing electric propulsion technology to deliver boating experiences.
Key facts about Flux Marine
- Founded Year: 2016
- Location: Boston (United States)
- Stage: Series A
- Total Funding till date: $30.5M
- Employee Count: 42 as on Aug 31, 2026
- Investors: Boost VC, Collide and 10 Others
- Latest Funding Round: Series A, Nov 19, 2025, $*****
4. EcoFactor
EcoFactor formerly known as GreenDeeds, provides residential energy management solutions for heating, ventilation, and air conditioning by its SaaS-based energy management engine which collects stores, and processes data points from individual homes, local weather stations, and various other geographic inputs. The company provides energy management solutions, including energy efficiency, demand response, diagnostics, and recommendations by applying data analytics. It serves utilities, energy retailers, and home services providers.
Key facts about EcoFactor
- Founded Year: 2006
- Location: Redwood City (United States)
- Stage: Series C
- Total Funding till date: $31.1M
- Employee Count: 10 as on Sep 30, 2026
- Investors: Claremont Creek Ventures, NRG Energy and 5 Others
- Latest Funding Round: Series C, 2015, $*****
- Highlight: Editors' Pick
5. Tank Utility
Propane tank monitoring solutions for fuel marketers and homeowners. This company provides a tank monitoring solution designed to streamline fuel delivery and prevent run-outs. For fuel marketers, the solution aims to optimize delivery routes and reduce costs. For homeowners, the company offers a mobile app and LTE monitor that provides alerts about fuel levels. This is a tech company offering a software solution. The business model is B2B and B2C. The company provides a SaaS solution for fuel level monitoring. Key features include remote monitoring, real-time data, and proactive alerts. The solution improves the fuel delivery experience for both suppliers and consumers. The website offers resources, support, and contact information. The company provides a login portal for users to access their accounts.
Key facts about Tank Utility
- Founded Year: 2014
- Location: Somerville (United States)
- Stage: Acquired
- Total Funding till date: $9.18M
- Employee Count: 15 as on Sep 30, 2026
- Investors: Bullpen Capital, Energy Foundry and 8 Others
- Latest Funding Round: Series A, Feb 14, 2019, $*****
- Highlight: Acquired
Cleantech Open's Year-on-Year Investment Trends
Cleantech Open has invested in 77 companies over the last 17 years, with an average of 0 new investment annually in the last 10 years. Its most recent first time investment was in Princeton NuEnergy and most recent follow-on round was in EcoFactor.Year | No. of Investments | ||
|---|---|---|---|
1st Round | Follow-on | Total | |
2026 (YTD) | 0 | 0 | 0 |
2025 | 0 | 0 | 0 |
2024 | 0 | 0 | 0 |
2023 | 0 | 0 | 0 |
2022 | 1 | 0 | 1 |
2021 | 0 | 0 | 0 |
2020 | 0 | 0 | 0 |
2019 | 1 | 0 | 1 |
2018 | 1 | 0 | 1 |
2017 | 1 | 0 | 1 |
Cleantech Open's Investments by Stage
Cleantech Open has made 9 investments in Grant (prize money) stage with an average round size of $96.2K and 5 investments in Seed stage with an average round size of $2.36M.Stage of entry | No. of Investments |
|---|---|
Grant (prize money) | 9 |
Seed | 5 |
Note: We have considered here, only first round of investments
Cleantech Open's Investments by Sector
Cleantech Open has a diverse portfolio, with companies operating in the Energy Tech, High Tech, Sustainability Tech, Environment Tech and Chemicals and Materials Tech. Notably, it has invested in 41 Tech companies, 37 Enterprise (B2B) companies, 19 Tech hardware companies and at least 10 companies focusing on Consumer (B2C).Sector | No. of Investments |
|---|---|
Energy Tech | 6 |
High Tech | 6 |
Sustainability Tech | 6 |
Environment Tech | 5 |
Chemicals and Materials Tech | 3 |
Others | 9 |
Note: We have considered here, only first round of investments
Cleantech Open's Investments by Geography
Cleantech Open has made most investments in United States (13), followed by France where it has made 1 investment.Country | No. of Investments |
|---|---|
United States | 13 |
France | 1 |
Note: We have considered here, only first round of investments
Cleantech Open's recent investments
Cleantech Open has not made any investment in 2026 so far.Here are the most recent investments by Cleantech Open:
Filter this listDate | Company | Location | Round Details | Round Amount | Co-Investors |
|---|---|---|---|---|---|
May 11, 2022 | United States | Seed | 2257 | [+4] | |
Sep 27, 2019 | United States | Grant (prize money) | 9265 | - | |
Feb 02, 2018 | United States | Grant (prize money) | 9302 | - | |
Feb 14, 2017 | France | Grant (prize money) | 5468 | - | |
2016 | United States | Seed | 6014 | - |
Acquired companies in Cleantech Open's Portfolio
3 companies from Cleantech Open's portfolio have been acquired. The most recent acquisition was Hexas Biomass in Dec 2025 by Bioleum for $*****.Here are Cleantech Open's portfolio companies that got acquired most recently:
Company | Acquisition Date | First Invested on | First Round of Investment | Round Size |
|---|---|---|---|---|
Dec 08, 2025 | - | - | 6329 | |
Sep 13, 2022 | Oct 18, 2013 | Grant (prize money) | 1530 | |
Sep 20, 2021 | Nov 24, 2015 | Grant (prize money) | 9361 |
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Team profile of Cleantech Open
Cleantech Open has a team of 27 members including 3 Partners and 7 Principals located in United States. Cleantech Open's team sits on the board of 1 company.Here is a list of top team members in Cleantech Open:
Name | Designation | Location | Board Memberships | Contact Details |
|---|---|---|---|---|
Partner | Boston | - | ||
Partner | Los Angeles | - | ||
Partner | Scottsdale | - | ||
Principal | San Francisco | |||
Principal | San Francisco | - | ||
Principal | San Francisco | - | ||
Principal | United States | - | ||
Principal | New York City | - | ||
Principal | Denver | - | ||
Principal | San Francisco | - |
Co-investors of Cleantech Open
Over the past 17 years, 71 investors have co-invested in Cleantech Open's portfolio companies. This includes only funds.
- Invested before Cleantech Open: New Jersey Economic Development Authority, Techstars and 4 others have invested in rounds before Cleantech Open. There is 1 company where New Jersey Economic Development Authority has invested before Cleantech Open and 1 company where Techstars has invested before Cleantech Open.
- Top Co-investors of Cleantech Open: 6 investors entered a company along with Cleantech Open. These include investors like Wistron (1 company).
- Invested after Cleantech Open: A total of 59 investors have invested in Cleantech Open's portfolio after their investments. Top Investors include America’s Seed Fund (2 companies) and DOE (1 company).
Recent News related to Cleantech Open
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Princeton NuEnergy raises $7M for Seed Fundingexplode.africa•May 14, 2022•Princeton NuEnergy, Wistron, Shell, Greenland Technologies and 2 others
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Surprising Takeaways from the 2013 Cleantech Open Global Forum | CleanTechIQCleanTechIQ•Grannus, Cleantech Open
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