69 Best Clean Technology Startups to Watch in 2025

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

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

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.

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

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

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

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.

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

A bio-based chemical manufacturer focusing on human and animal nutrition, health, and materials markets.

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

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

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

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.

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

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.

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.

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

General Fusion pursues a fast, efficient, and collaborative path to practical fusion power. We are completing an aggressive development plan to deliver economical carbon-free fusion energy with our proprietary Magnetized Target Fusion technology by the 2030s.

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

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.

South Pole is a Zurich-based climate solutions company offering sustainable project development services in order to provide carbon offset credits to businesses and organizations.

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

Planet A Foods is a cocoa-free chocolate maker founded in 2021 by Sara Marquart.

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

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

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

Meatable is a cellular agriculture company making 100 percent clean meat products.

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

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

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

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

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

Mosa Meat is a Dutch start-up company that makes and commercializes clean meat, meat made by growing animal cells directly rather than slaughtering animals.

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.

Toast Ale is a London-based brewery using surplus fresh bread to brew beer and dedicating their profits to charities working to create greater efficiency in the food supply system.

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.

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.

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

Spiber, Inc is a private biomaterials company using industrial biotechnology to develop silk.

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

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

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

Northvolt develops sustainable lithium-ion batteries in conjunction with R&D, industrialization, and recycling to support clean energy.

Minimum is a carbon tracking and carbon offsetting company

Climeworks is a clean technology company that has developed technology for carbon dioxide (CO2) capture from ambient air. It was founded in 2009 and is located in Zurich, Switzerland.

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

Uncommon, formerly known as Higher Steaks, is a cellular agriculture company based in London, England founded in 2017 by Benjamina Bollag, Stephanie Wallis and David Hay working to develop pork and other meat products using cellular agriculture.

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.

EmitWise helps large businesses monitor and reduce their carbon footprints.

RoadBotics is a Pittsburgh-based artificial intelligence company.

LeadCold is a company developing lead-cooled small nuclear reactor technology founded in 2013 by Janne Wallenius, Jesper Ejenstam and Peter Szakalos.

Developer and manufacturer of systems for renewable industrial gas and fuel production.

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

Shiok Meats is a Singapore-based cellular agriculture company focusing on making cultured seafood.

Terrestrial Energy is developing molten salt nuclear reactors.

Svante is a Burnaby-based manufacturer of carbon capture technology to collect CO2 at its sources.

Taiwanese-based venture-backed company that develops and sells electric scooters and battery swapping infrastructure

Ynsect is a company that develops ingredients for aquaculture, pet food and fertilizer using insect protein.

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

Aerones is a company building heavy-lift drones founded in 2015 by Janis Putrams.

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

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

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

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

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.

Twelve (formerly Opus 12) is a company developing CO2 recycling devices that turn CO2 into chemicals and fuels.

A company designing and building autonomous electric transportation (AET) systems for freight and cargo.

A data intelligence company aiding urban opeartors in decision making

Olio is a London-based sharing company working to solve the problem of food waste and hunger.