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 758 start-ups with an aggregate funding of $20.0b. The average funding per company in this subset is $290.3m.

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

See all results for this search

Track over 71,000 companies

Discover
Fast-growing Global startups

Seedtable uses technology and people to track over 71,000 companies to help you find the right ones to partner with.

Pricing + Sign up

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:

1

Funding Rounds

$50.0k

Money raised

Pembient uses advances in biotechnology to fabricate horn and other wildlife products to combat the threat to endangered species.

11

Funding Rounds

$1.9b

Money raised

Impossible Foods is a plant-based meat company making meat and dairy products that are made to look and feel like animal products by manufacturing heme, the oxygen binding molecule found in blood, using engineered yeast grown in bioreactors.

8

Funding Rounds

$406.4m

Money raised

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

4

Funding Rounds

$74.3m

Money raised

Pachama is a company estimating carbon storage in forests and predicting future deforestation or potential for forest restoration with the use of satellite images.

6

Funding Rounds

$577.8m

Money raised

Helion Energy is a fusion power company aiming to build the world's first fusion power plant.

Key people:

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:

3

Funding Rounds

$2.9m

Money raised

Caban Systems is a Burlingame, California-based renewable energy and energy storage company developing modular energy storage platforms for critical infrastructure power needs.

Key people:

5

Funding Rounds

$58.2m

Money raised

Shelf Engine is a Seattle-based software company and developer of an automated prediction ordering platform for food retailers, intended to reduce food waste.

Location:

Key people:

9

Funding Rounds

$177.9m

Money raised

Pyrowave is a company founded by Jocelyn Doucet, Jamal Chaouki, and Jean-Philippe Laviolette.

7

Funding Rounds

$83.0m

Money raised

Molecular Assemblies, Inc. is an enzymatic DNA synthesis technology founded in 2013 by Curt Becker, Bill Efcavitch and William Efcavitch.

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.

4

Funding Rounds

$580.8m

Money raised

Upside Foods is a San Francisco-based company making cultured meat products. The company was founded by Uma Valeti, Nicholas Genovese, and Will Clem.

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.

1

Funding Rounds

$408.5k

Money raised

Urban Electric Power is a Pearl River, New York-based developer of a zinc manganese dioxide battery technology. The company was spun out of the CUNY Energy Institute in 2013.

Key people:

7

Funding Rounds

$63.3m

Money raised

Catalog is a Boston, Massachusetts-based company developing a platform for DNA-based digital data storage.

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.

9

Funding Rounds

$331.1m

Money raised

Modern Meadow is a biotechnology company using cellular agriculture and biofabrication to manufacture bioleather, "Zoa", out of cultured animal free collagen mixed with natural and man made materials.

6

Funding Rounds

$99.3m

Money raised

LevelTen Energy provides a clean energy procurement platform for midsize businesses and enterprises.

Location:

Key people:

5

Funding Rounds

$43.9m

Money raised

Via Separations is a Watertown, Massachusetts-based company founded in 2016 by Shreya Dave.

5

Funding Rounds

$104.5m

Money raised

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

8

Funding Rounds

$269.6m

Money raised

Boom Supersonic is a Colorado-based company developing supersonic commercial aircraft.

Location:

Key people:

1

Funding Rounds

$13.0m

Money raised

Blue Origin is an American, privately-funded, aerospace developer and manufacturer that is interested in lowering the cost of spaceflight in order to explore the solar system

Location:

Key people:

1

Funding Rounds

$1.0m

Money raised

Zeedz is a play-for-purpose, NFT collectible game, in which players reduce global carbon emissions by collecting plant-inspired creatures: Zeedles.

Location:

Key people:

9

Funding Rounds

$1.3b

Money raised

Back Market is an online refurbished goods marketplace connecting consumers with sellers of electronic devices.

Location:

Key people:

2

Funding Rounds

$5.0m

Money raised

Avalanche Energy Designs is an American start-up company designing, testing, and building micro-fusion reactors.

Location:

Key people:

9

Funding Rounds

$474.1m

Money raised

Solugen is a speciality chemical manufacturing company developing aiming to replace petroleum-based chemicals with alternatives made from plant-based substitutes.

8

Funding Rounds

$175.0m

Money raised

Viridos is applying synthetic biology to microalgae for the production of products that address climate change and sustainability. Viridos is focused on producing algal biofuels and other sustainable resources from algae.

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.

10

Funding Rounds

$28.5m

Money raised

Membrion is a Seattle-based clean technology company and developer of flexible ceramic ion exchange membranes capable of being used in wastewater cleaning and in energy storage solutions.

Location:

Key people:

3

Funding Rounds

$145.0m

Money raised

Cala Health offers bioelectronic medicines, medical devices, and neurotherapeutics for managing chronic health conditions.

Key people:

3

Funding Rounds

$80.7m

Money raised

ZeroAvia is an aerospace company developing practical zero emission aviation powertrains using hydrogen power.

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.

11

Funding Rounds

$262.6m

Money raised

BlocPower is a Brooklyn-based provider of a platform for energy efficiency and management for commercial and residential buildings.

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.

8

Funding Rounds

$11.6m

Money raised

RoadBotics is a Pittsburgh-based artificial intelligence company.

Location:

Key people:

6

Funding Rounds

$265.4m

Money raised

A New Zealand industrial biotechnology company developing a gas fermentation platform for converting concentrated industrial emissions into valuable chemicals.

5

Funding Rounds

$40.7m

Money raised

Terrestrial Energy is developing molten salt nuclear reactors.

Location:

Key people:

5

Funding Rounds

$69.9m

Money raised

75F is a Bloomington, Minnesota-based technology company offering an Internet of Things (IoT) building automation system for HVAC, lighting, and equipment control.

4

Funding Rounds

$150.0m

Money raised

Net Power is a Durham, North Carolina-based natural gas electricity producer using carbon capture and storage to maintain zero emissions production.

2

Funding Rounds

$300.0m

Money raised

Diamond Foundry is a San Francisco-based company focusing on lab-grown diamonds.

1

Funding Rounds

Remora is a carbon capture for semi trucks founded in 2020 by Paul Gross.

7

Funding Rounds

$13.2m

Money raised

Epic Cleantec is a full-service water technology company providing turnkey wastewater treatment and reuse systems for the built environment.

Location:

Key people:

3

Funding Rounds

$113.0m

Money raised

Natural Fiber Welding is a Peoria, Illinois-based company developing a scalable fabrication platform that can offset the global dependence on petroleum-based, human-made materials.

2

Funding Rounds

$95.0m

Money raised

A data intelligence company aiding urban opeartors in decision making

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:

10

Funding Rounds

$33.0m

Money raised

NEXT Energy Technologies is a Santa Barbara, California-based developer of photovoltaic coatings for window.

Key people:

5

Funding Rounds

$40.4m

Money raised

Enervee is a company founded in 2010 by Hjalmar Branting, Iker Casillas, Aoife Ní Fhearraigh, Yhonastan Fabian, The Sxplay, Ujiie Naotomo, Robbie Grossman, Ingrid Gfölner, Moisey Uretsky, Don Epperson, Matt Service FBCS and Bhavesh M. Mehta.

6

Funding Rounds

$9.1m

Money raised

PRENAV is a company that is digitizing critical infrastructure in the world using AI.

3

Funding Rounds

$187.0m

Money raised

A company creating sustainable design solutions with biomaterials. It was founded in 2013 and is located in San Francisco, California.

6

Funding Rounds

$490.0m

Money raised

An nanotechnology company with focus on developing solar products. It was founded in 2002 and closed in 2013.

7

Funding Rounds

$332.8m

Money raised

Zap Energy is developing compact fusion power that doesn't require magnets or lasers.

10

Funding Rounds

$121.7m

Money raised

iUNU is a Seattle-based agricultural tech startup founded in 2013.

Location:

Key people:

3

Funding Rounds

$27.8m

Money raised

Coreshell Technologies is engineering liquid-deposited nanolayer coatings for Lithium Ion Batteries.

8

Funding Rounds

$851.0m

Money raised

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

4

Funding Rounds

$12.4m

Money raised

Nori is a company that hosts an open-source, blockchain-based market for purchasing carbon offsets.

3

Funding Rounds

$12.2m

Money raised

Capturing CO2 from the sky and re-selling it for 2x cheaper

17

Funding Rounds

$1.5b

Money raised

Proterra is an American automotive and energy storage company based in Burlingame, California.

Key people:

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.

7

Funding Rounds

$3.2m

Money raised

Faraday Bicycles is a San Francisco-based company founded in 2012 by Adam Vollmer.

10

Funding Rounds

$14.4m

Money raised

Carbon capture and storage company founded in 2007 and based in Dartmouth, Nova Scotia, Canada. CarbonCure Technologies Inc. provides carbon dioxide sequestering technology to concrete plants in a system for recycling carbon dioxide waste from industrial emitters and incorporating it into concrete products.

4

Funding Rounds

$217.5m

Money raised

Pure Watercraft is a company that produces electric boats and motors. It was founded in 2011 by Andy Rebele and Kerwin Loukusa.

1

Funding Rounds

$40.0m

Money raised

Allonnia is developing a new solution intended for waste remediation and management.

5

Funding Rounds

$264.5m

Money raised

Arcadia, previously Arcadia Power, is a Washington, D.C. based tech company which aims to enable a zero-carbon economy. Arcadia is also the developer of a clean energy tech platform designed to facilitate access to clean energy.

Key people:

7

Funding Rounds

$151.6m

Money raised

A carbon sequestration technology and bioplastics company based in Huntington Beach, California, founded in 2003, that uses their technology to capture carbon from greenhouse emissions for production of bioplastics.

5

Funding Rounds

$225.0m

Money raised

A biotechnology company that specialized in the renewable energy sector. It was located in Bedford, Massachusetts and is no longer in operation.

Key people:

2

Funding Rounds

$81.0m

Money raised

Monarch Tractor offers a fully electric tractor platform.

Key people:

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.

Sign up to access our full database

Enter your email and get access to 71,000 + technology companies you can partner with.

Join 29000+ founders, operators, and investors.