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Venture - Series Unknown CleanTech Companies

Explore 102 cleantech startups that raised venture - series unknown funding. Access verified founder contact information and fundraising data.

Total Companies
102
Total Funding
$250.5M
Avg Funding
$10.0M
Cities
25

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Lisbon, Portugal
$3.3M
raised

Personal finance and investment app that connects people and companies with organizations that need funding for sustainability projects.

May 2025
Venture - Series Unknown

Founder Contacts

41,000+ verified contacts

Woburn, United States
$75.0M
raised

Boston Metal is a metals production company that develops an electric-powered tech to decarbonize steelmaking and metal production.

May 2026
Venture - Series Unknown

Founder Contacts

41,000+ verified contacts

Somerville, United States

Sublime Systems develops technology to decarbonize cement-making.

May 2025
Venture - Series Unknown

Founder Contacts

41,000+ verified contacts

New York, United States
$6.4M
raised

Carbon conversion technology bolts onto ANY source of carbon dioxide emissions converts the pollution into clean natural gas StandardRNG

May 2025
Venture - Series Unknown

Founder Contacts

41,000+ verified contacts

Mesa, United States
$4.3M
raised

Persefoni AI is an IT company that provides a climate management and accounting platform for real-time management and disclosure.

May 2026
Venture - Series Unknown

Founder Contacts

41,000+ verified contacts

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41,000+ verified emails
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Boulder, United States

Electra is a a clean iron company that uses a low-temperature, electrochemical-hydrometallurgical system to refine iron ore.

Apr 2026
Venture - Series Unknown

Founder Contacts

41,000+ verified contacts

Florø, Norway
$7.7M
raised

Evoy designs and delivers powerful electric motor systems for boats that reduce environmental impact

Apr 2022
Venture - Series Unknown

Founder Contacts

41,000+ verified contacts

Santa Clara, United States
$55.4M
raised

Natron Energy is an energy storage company that develops sodium ion battery solutions leveraging Prussian Blue electrode materials.

Apr 2025
Venture - Series Unknown

Founder Contacts

41,000+ verified contacts

Saint-sulpice, Switzerland
$19.2M
raised

Daphne Technology is a developer of a sustainable, technically advanced and cost efficient air emissions control system.

Apr 2026
Venture - Series Unknown

Founder Contacts

41,000+ verified contacts

Stockholm, Sweden
$4.2M
raised

Bright Energy is a Swedish electricity company that offers companies and households hourly rates on electricity.

Apr 2022
Venture - Series Unknown

Founder Contacts

41,000+ verified contacts

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41,000+ verified emails
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San Diego, United States

EFG is an innovative change in the portable generator and independent energy market converting hydrogen-on-demand to electricity.

Apr 2026
Venture - Series Unknown

Founder Contacts

41,000+ verified contacts

Watertown, United States

Via Separations is a technology company that develops membrane materials for modular and resource separation solutions.

Apr 2026
Venture - Series Unknown

Founder Contacts

41,000+ verified contacts

Cambridge, United Kingdom
$2.3M
raised

Pulsiv develops world-leading electronic solutions for AC to DC Power Supplies and Solar Energy applications.

Mar 2024
Venture - Series Unknown

Founder Contacts

41,000+ verified contacts

Portland, United States
$2.2M
raised

Bold Reuse is a full-service reuse platform that makes transitioning to reusables easy.

Mar 2026
Venture - Series Unknown

Founder Contacts

41,000+ verified contacts

Vilnius, Lithuania

Viezo is a tech start-up company that specializes in energy harvesting technology that convert vibrations into electricity.

Mar 2023
Venture - Series Unknown

Founder Contacts

41,000+ verified contacts

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41,000+ verified emails
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London, United Kingdom

Heat Geek is a designer and installer of energy systems.

Mar 2026
Venture - Series Unknown

Founder Contacts

41,000+ verified contacts

Vantaa, Finland
$1.4M
raised

Themo is a smart thermostat cleantech company.

Mar 2024
Venture - Series Unknown

Founder Contacts

41,000+ verified contacts

Barcelona, Spain
$11.9M
raised

WtEnergy operates as a clean energy startup.

Feb 2026
Venture - Series Unknown

Founder Contacts

41,000+ verified contacts

Henderson, United States

ECO Integrated Technologies is a cleantech company that produces water alternative and solid waste conversion.

Feb 2023
Venture - Series Unknown

Founder Contacts

41,000+ verified contacts

Tallinn, Estonia

Hepta Insights is a Automating defect analysis for power lines bringing 3 dimensional world to everyone, everywhere.

Feb 2025
Venture - Series Unknown

Founder Contacts

41,000+ verified contacts

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41,000+ verified emails
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Golden, United States
$1.9M
raised

Steelhead Composites is a provider of hydrogen storage solutions used to allow widespread zero-emission fuel cell electrification.

Oct 2025
Venture - Series Unknown

Founder Contacts

41,000+ verified contacts

Sheffield, United Kingdom
$6.8M
raised

mopo provides clean, affordable energy to the off-grid market in Africa.

Sep 2025
Venture - Series Unknown

Founder Contacts

41,000+ verified contacts

Bozeman, United States
$3.5M
raised

MagDrive Technologies is a magnetically actuated valve drive capable of producing torque.

Jul 2025
Venture - Series Unknown

Founder Contacts

41,000+ verified contacts

Oakville, Canada
$25.8M
raised

Terrestrial Energy is a developer of a reactor power plant technology to provide carbon-free energy for the global industry.

Jul 2025
Venture - Series Unknown

Founder Contacts

41,000+ verified contacts

Menlo Park, United States
$19.2M
raised

Novoloop is an upcycling company that provides a proprietary lifecycling platform to create chemicals and materials from plastic waste.

Jun 2025
Venture - Series Unknown

Founder Contacts

41,000+ verified contacts

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102 CleanTech Venture - Series Unknown Startups (September 2026) — Page 2 | VCBacked