69 Best Clean Technology Startups in United States to Watch in 2025

The Definitive Seedtable Ranking of Clean Technology Startups in United States

We track 71,000+ companies and rank them dynamically using our Seedtable Score – a score that uses quantitative and qualitative data points to signal the momentum behind a company. We then monitor the list manually leveraging our expertise as founders and investors.

There are 94 start-ups with an aggregate funding of $24.5b. The average funding per company in this subset is $354.9m.

Last update to the database: Feb 18, 2025. See changelog.

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5

Funding Rounds

$72.2m

Money raised

Arzeda is a biotechnology and software company designing custom microorganisms for industrial applications through computational enzyme design, protein optimization, and metabolic engineering.

Key people:

8

Funding Rounds

$406.4m

Money raised

Bolt Threads is a biotechnology company that makes high performance fabrics and materials using biology.

7

Funding Rounds

$711.5m

Money raised

Perfect Day Foods (formerly Muufri) engineered yeast capable of producing the proteins found in cows milk. They use these proteins to make their own line of animal-free dairy products.

Key people:

8

Funding Rounds

$551.0m

Money raised

Eat Just is a San Francisco based food technology company founded in 2011. The company is known for its bean-based egg substitute called Just Egg. Eat Just also produces egg-free mayonnaise.

21

Funding Rounds

$1.9b

Money raised

Apeel Sciences is a company that develops treatments to prevent spoilage of fruits and vegetables using molecules naturally found in peels, which maintain moisture and keep out oxygen.

5

Funding Rounds

$2.1b

Money raised

Commonwealth Fusion Systems is a Cambridge, Massachusetts-based research and development company developing fusion power systems based on ARC tokamak reactors.

5

Funding Rounds

$104.5m

Money raised

A cellular agriculture company making fresh and frozen cultured seafood products.

Key people:

8

Funding Rounds

$286.6m

Money raised

SparkCognition is an artificial intelligence and cybersecurity company offering cognitive computing analytics for the information technology, operational technology, and the internet of things (IoT) industries.

7

Funding Rounds

$21.2m

Money raised

Wild Earth is a biotechnology company using cellular agriculture to produce high-protein pet food.

1

Funding Rounds

$32.0m

Money raised

Air Protein is a Berkeley-based biotechnology company producing protein with microorganisms that are fed carbon dioxide in a mission to replace animal agriculture.

8

Funding Rounds

$1.1b

Money raised

Pivot Bio is a company that creates technology that is focused on nitrogen fixation in cereal crops through microbes.It was founded in 2010 and is located in Berkeley, California.

3

Funding Rounds

$15.0m

Money raised

Biotechnology company developing proteins from algae for animal and human health and address world's food shortages

Key people:

8

Funding Rounds

$851.0m

Money raised

Nature's Fynd is a biotechnology company growing edible proteins founded in 2012.

10

Funding Rounds

$274.2m

Money raised

Calysta is a biotechnology company seeking to improve worldwide food security through making animal feed. The company is based out of Menlo Park, California and was founded in 2012 by Josh Silverman.

8

Funding Rounds

$28.3m

Money raised

Verdigris is a California-based company developing smart grid and energy management technology aided by artificial intelligence. It was founded by Mark Chung, Thomas Chung, and Jonathan Chu.

4

Funding Rounds

$250.0k

Money raised

Local Motors is an American motor vehicle manufacturing company that is interested in providing low-volume vehicle manufacturing

3

Funding Rounds

$3.0b

Money raised

Convoy is a trucking and logistics company that utilizes technology to connect shippers with carriers and book services.

9

Funding Rounds

$969.3m

Money raised

Farmers Business Network is a company that utilizes data to provide enterprise solutions for farmers.

5

Funding Rounds

$2.7b

Money raised

Nikola Motor Company is a Phoenix, Arizona-based automotive company founded in 2014 by Trevor Milton.

6

Funding Rounds

$617.5m

Money raised

Bowery Farming is a New York-based agriculture company focused on building indoor vertical farms.

Key people:

8

Funding Rounds

$25.4m

Money raised

Biosortia is a therapeutics, agrochemical and cosmetics company developing products from microbial small molecules through microbiome mining.

2

Funding Rounds

$5.1m

Money raised

Plantible Foods provides sustainable, non-GMO plant-based proteins to food manufacturers, aiming to reshape the future of food by addressing the challenges of nutrition, taste, and environmental impact.

Key people:

7

Funding Rounds

$695.0m

Money raised

Aurora Solar is a San Francisco-based developer of solar design, proposal, and sales software.

2

Funding Rounds

$28.5m

Money raised

A food and beverage company using cellular agriculture to make cow cheese.

Key people:

11

Funding Rounds

$528.2m

Money raised

Stem is a Millbrae, California-based developer of solutions for energy consumption through a combination of data, predictive analytics, and energy storage to reduce energy costs.

4

Funding Rounds

$90.0m

Money raised

Checkerspot is a Berkeley, California-based materials innovation company.

3

Funding Rounds

$24.0m

Money raised

Shiru is a food technology company developing enhanced proteins for food. It was founded in 2019 and is located in the United States.

4

Funding Rounds

$875.0m

Money raised

Sila Nanotechnologies is an Alameda, California-based company engineered materials company focused on improving energy storage.

6

Funding Rounds

$225.0m

Money raised

FreeWire Technologies is a San Leandro, California-based provider of battery systems for electric vehicle charging and mobile distributed power.

5

Funding Rounds

$162.0m

Money raised

Sense is a Cambridge, Massachusetts-based developer and distributor of energy tracking and automation solutions. Sense specializes in tracking devices and home automation solutions for its customers.

7

Funding Rounds

$52.9m

Money raised

EV Connect is a company founded in 2009 by Jordan Ramer.

8

Funding Rounds

$1.2b

Money raised

Indigo is an agricultural technology company utilizing natural microbiology and digital technologies to improve farmers' profitability, environmental sustainability and consumer health.

5

Funding Rounds

$109.7m

Money raised

TerViva is an Alameda, California-based food and agriculture technology company that produces pongamia trees with oil and protein-rich beans, similar to soybean, for plant-based food ingredients.

13

Funding Rounds

$411.1m

Money raised

A food company making dairy-free plant-based milk and dairy products.

1

Funding Rounds

$2.7m

Money raised

Holy Grail is focused on the development of autonomous research systems dedicated to material science and chemistry with the goal of replacing the use of fossil fuels with electro-chemical battery solutions.

6

Funding Rounds

$72.0m

Money raised

OhmConnect is a company founded in 2013 by Curtis Tongue, Matt Duesterberg and Cadir Lee.

Key people:

6

Funding Rounds

$28.6m

Money raised

Evrnu is a Seattle-based developer of technology to recycle cotton garment waste into renewable textiles.

Key people:

7

Funding Rounds

$45.5m

Money raised

Arcimoto is a company founded in 2007 by Mark Frohnmayer.

2

Funding Rounds

$25.0m

Money raised

Airspace Systems uses machine vision and deep learning to detect anomalies and classify rogue drones.

5

Funding Rounds

$452.1m

Money raised

Inari is a biotechnology and agricultural technology company

3

Funding Rounds

$85.0m

Money raised

GHGSat is a Montreal-based company developing sensors to monitor industrial emissions.

1

Funding Rounds

$40.0k

Money raised

re3D is a company founded in 2013 by Matthew Fiedler.

Key people:

2

Funding Rounds

$944.0k

Money raised

Swiftmile is a company founded by Colin Roche, Keith Moravick and Leo Vera.

Location:

Key people:

4

Funding Rounds

$537.4m

Money raised

Developer of software-defined high power microwave (HPM) technology designed to counter unmanned aircraft systems (UAS). The company's technology addresses threats such as drones and other asymmetric technologies, enabling defense organizations to stun drones with a hard reset or knock swarms out of the sky.

4

Funding Rounds

$4.3m

Money raised

Qubitekk is a company that is making quantum technologies for scientists, engineers, and developers.

8

Funding Rounds

$181.0m

Money raised

Fulcrum Bioenergy is a Pleasanton, California-based biofuel and clean technology company.

Key people:

5

Funding Rounds

$329.3m

Money raised

Developer of an electric bicycle. The company's electric bikes provides ample starting torque and a high top speed while keeping the weight of the bike low for floating over snow and sand.

4

Funding Rounds

$512.5m

Money raised

Crusoe Energy Systems is a company founded in 2018 by Chase Lochmiller.

3

Funding Rounds

$1.2m

Money raised

Dreamweaver International is a company that produces lithium-ion battery separators, founded by Brian Morin.

2

Funding Rounds

$35.0m

Money raised

Palmetto is a company founded in 2008.

3

Funding Rounds

$104.8m

Money raised

EcoFlow is a mobile power company that is reinventing the way the world accesses energy.

1

Funding Rounds

$8.0k

Money raised

Volt Markets is a blockchain company founded in 2016 by Rob Hitchens, Dan Nossa and James Duchenne.

5

Funding Rounds

$261.9m

Money raised

6K is a North Andover, Massachusetts and New Cumberland, West Virginia-based custom fabrication and additive manufacturing company.

1

Funding Rounds

$6.0m

Money raised

LOLIWARE has pioneered the world's leading seaweed technology to replace single-use plastics. LOLIWARE's products harness LIST (LOLIWARE Intelligent Seaweed Technologies) to create single-use items designed to disappear. LOLIWARE is poised to completely replace single-use plastics beginning with the launch of the company's new seaweed-based straw in 2019. LOLIWARE's straw looks, feels, and acts like plastic, but is made from 100% food-grade materials. It is designed to disappear either through composting or natural processes.

8

Funding Rounds

$14.1m

Money raised

Graphenix Development Inc. is a developers of energy density electrodes founded in 2010 by Robert Anstey.

3

Funding Rounds

$33.2m

Money raised

Programming biolCellibre is a best-in-class manufacturing technology company.. Employing an organism-agnostic approach, we turn cells into specialized, sustainable factories for the manufacture of globally significant products at scale.ogy to turn cells into factories company

Key people:

5

Funding Rounds

$792.0m

Money raised

Redwood Materials is a battery recycling company founded in 2017.

1

Funding Rounds

Fenix International is a company founded in 2009 by Mike Lin.

3

Funding Rounds

$53.0m

Money raised

Heirloom is a San Francisco-based environmental remediation company founded by Shashank Samala.

Key people:

2

Funding Rounds

$418.9k

Money raised

Manufacturer of electric motorbikes designed to create fully electric motorbike for urban transport, that is simple to operate and fun to drive. The company's electric motorbikes can start with a unique pass code or the owners smartphone enabling users to nimbly navigate the city without the need for registration and insurance, or even a license.

4

Funding Rounds

eMotorWerks is a company founded in 2010 by Val Miftakhov.

3

Funding Rounds

$360.0k

Money raised

TEQ Charging increases affordability and accessibility of electric vehicle charging.

Key people:

4

Funding Rounds

$550.0k

Money raised

Its mission is to offer the Solar Site Design information technology platform to solar professionals worldwide.

2

Funding Rounds

$7.0m

Money raised

Greenlots is a company founded in 2017 by Ron Mahabir.

3

Funding Rounds

$108.6m

Money raised

RoadRunner Recycling is a company founded in 2014.

1

Funding Rounds

$3.8m

Money raised

Ridepanda is a San Francisco-based company selling e-bikes, e-scooters, and e-mopeds. The company was founded by Chinmay Malaviya and Charlie Depman in 2020.

Key people:

2

Funding Rounds

$548.0m

Money raised

Onsite power generation for the zero carbon future

5

Funding Rounds

$84.4m

Money raised

Zero Mass Water is a Scottsdale, Arizona-based developer and manufacturer of solar-power devices designed to extract drinkable water from atmosphere.

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