Cleantech Startups
5,220 companies tagged Cleantech, with their investors and founders.
Transaera develops heat pump systems and Dedicated Outdoor Air Systems (DOAS) that use novel materials to dehumidify, cool, and heat air for commercial buildings. Its rooftop units remove humidity before cooling to cut energy use and emissions, targeting building operators seeking lower operating costs and comfort in humid climates.
6 investors
Treehouse provides installation services for EV chargers, home battery backup systems, electrical panel upgrades, and other electrical projects, using a virtual assessment process to deliver online quotes. It serves residential, multi-family, and commercial customers with licensed electricians who handle permitting, inspection, and financing.
6 investors
Uravu Labs develops "Clausius", a water-positive cooling platform for data centers that uses a proprietary liquid salt to absorb atmospheric water vapor and low-grade waste heat (35β60Β°C) to regenerate it, returning chilled facility water while producing distilled water as a by-product. It targets data center operators, OEMs, and engineering partners, aiming to lower PUE and achieve negative water usage effectiveness.
6 investors
X-energy develops advanced nuclear energy technology, including small modular high-temperature gas reactors and TRISO fuel. Its reactors are designed to supply electricity and high-temperature steam for utilities and energy-intensive heavy industry.
6 investors
Yardstick provides tools to measure, plan, and analyze soil carbon data, including instant soil carbon measurement, sample planning aligned with protocols such as Verra VM0042 and CAR SEP, and data mapping and auditing. It serves soil carbon project stakeholders in agriculture and carbon measurement.
6 investors
EneCoat Technologies develops and manufactures perovskite solar cells (PSCs) and related materials. The company specializes in advanced solar cell technology and materials for the renewable energy sector.
6 investors
60Hertz Energy provides asset management and computerized maintenance software for renewable energy operations, covering solar (C&I, utility scale, agrovoltaics), utility scale wind, substations, and vegetation management. It serves energy service providers and operators managing distributed generation and renewable energy campuses.
5 investors
Aclarity makes the Octa System, an electrochemical oxidation technology that destroys PFAS "forever chemicals" on-site by breaking carbon-fluorine bonds. It serves landfills, industrial sites, municipal and industrial wastewater operators, drinking water utilities, and aviation/AFFF-contaminated sites managing PFAS and other difficult-to-treat contaminants.
5 investors
actnano develops PFAS-free, gel-state conformal coatings (Advanced nanoGUARD) that protect printed circuit boards and electronics from water, condensation, and harsh environments. It serves automotive/ADAS, consumer electronics, medical, solar, industrial, and optical markets, and can integrate the coatings into existing manufacturing lines.
5 investors
Addis Energy develops technology that combines oil and gas engineering expertise with advanced research to access energy and resources from subsurface geology.
5 investors
Advanced Ionics develops electrolyzer technology for producing green hydrogen, using its Symbiotic water vapor electrolysis that operates at intermediate temperatures and taps into existing industrial steam to lower electricity and capital costs. It targets industrial customers with hydrogen needs and exothermic processes, aiming to reduce the cost premium of green hydrogen production.
5 investors
AIRMO develops satellite-based methane measurement technology for detecting methane emissions with precision and global coverage. The company serves energy operators and provides commercial monitoring solutions across Europe, the Middle East, and other continents.
5 investors
AirMyne develops engineered carbon removal technology that captures CO2 directly from the air, as well as at point-of-emissions, to help corporations and governments manage and reduce their CO2 emissions. Its platform is designed for high uptime and durable, scalable carbon removal capacity.
5 investors
Allium manufactures stainless-clad rebar that meets the AASHTO M 329M standard, offered in a full size range (#3β#18) and ASTM A615 and A706 specifications. It supplies fabricated and delivered material to the construction and infrastructure market across North America.
5 investors
Alva Industries develops electric motors and drive systems using a patented FiberPrinting production technology for ironless, slotless stator windings, offering compact torque motors such as SlimTorq and GearTorq. The company targets electrification across multiple industries with a focus on high torque-density and lightweight motor designs.
5 investors
Ambee provides environmental and climate intelligence data platforms, including air quality, pollen, wildfire, and natural disaster datasets, that help businesses understand how climate and environmental variables impact their operations and risk. The company serves Fortune 500 companies and organizations across pharma, consumer health, media, and other industries globally.
5 investors
American Terawatt is building a national high-voltage direct current (HVDC) transmission network in the United States designed to deliver gigawatts of power to large industrial loads. The company targets 4,000MW of capacity by 2028 and 14GW by 2030 using 525kV multi-terminal DC transmission.
5 investors
Ampaire develops hybrid-electric propulsion systems for aircraft, with the AmpDrive technology deployed across multiple aircraft types to reduce fuel consumption, maintenance costs, and noise emissions. The company targets the aviation industry with technology designed for scaling from current hybrid-electric operations to future mass-market electric aircraft.
5 investors
Aqua Membranes makes precision-printed elements for industrial reverse osmosis (RO) systems, designed to increase production, lower energy costs, reduce cleaning cycles, and improve recovery without retrofits. Its patented technology targets industrial water treatment and filtration applications.
5 investors
Aspiring Materials develops sustainable materials technology with environmental impact focus. The company brings together an international team committed to positive environmental change.
5 investors
AssetCool builds robotic systems, including its Capacity-1 line robots, that apply capacity-enhancing coatings to existing overhead power lines to increase grid capacity without lengthy outages or reconductoring. It serves grid operators and power utilities working on energy transition and grid upgrades.
5 investors
Aurora Solar offers a software platform for solar installers and sales teams to design, quote, finance, and deliver residential solar and storage projects, including remote 3D modeling with shade and tilt analysis, permit-quality proposals, and lead capture tools. It serves solar companies looking to speed up proposal creation and improve design accuracy across the sales and installation lifecycle.
5 investors
Axine Water Technologies develops electrochemical oxidation technology to destroy PFAS, pharmaceuticals, solvents, and other persistent organic contaminants in industrial wastewater. It offers a treatment-as-a-service model with on-site systems aimed at helping industrial operators meet wastewater compliance regulations.
5 investors
Blue Energy develops scalable small modular reactor (SMR) technology to deliver nuclear power at scale. The company focuses on removing economic barriers to nuclear infrastructure deployment for utilities and data centers seeking clean, reliable baseload energy.
5 investors