Cleantech Startups
5,221 companies tagged Cleantech, with their investors and founders.
HomeBoost provides home energy efficiency services aimed at making energy affordability accessible to homeowners through three offerings. The company operates in the residential energy sector in the United States.
3 investors
Huue produces bio-based indigo dye for the denim industry using bioengineered microbes that convert sugar into pigment, replacing toxic chemical and petroleum-based processes. The company's sustainable indigo is compatible with existing manufacturing and reduces toxicity, fossil fuel use, and water pollution in denim production.
3 investors
HydGene develops biocatalyst technology that converts biomass into fertilisers, fuels, and chemicals for industrial producers. The company focuses on enabling chemical manufacturing from existing biomass feedstocks.
3 investors
Hydrostor develops long-duration energy storage using Advanced Compressed Air Energy Storage (A-CAES), a closed-loop system combining air, water, and purpose-built underground hard-rock caverns to store off-peak electricity for the electric grid. It designs and operates utility-scale storage facilities (500 MW, 8+ hours) providing grid services such as inertia, voltage support, and black start, with projects in Canada, the United States, and Australia.
3 investors
Hyliion develops the KARNO linear power generator, a technology for clean, flexible, and scalable electricity production. The company operates in the power generation and energy technology sector.
3 investors
Iconic Air offers a carbon accounting platform that helps companies in energy-intensive industries calculate, visualize, and report emissions data at high frequency. The software supports auditing, forecasting, scenario planning, and third-party verification to track progress toward net-zero goals.
3 investors
Imperium Technologies builds an integrated electro-mechanical steam trap paired with a real-time steam system intelligence platform to detect and manage steam system waste, faults, and emissions. It serves industrial operators and service providers who traditionally relied on manual inspections and older infrastructure.
3 investors
Impossible Metals builds underwater robotic vehicles to collect critical metals from the seabed for clean energy applications, with a focus on sustainable and environmentally responsible extraction practices.
3 investors
Indow makes custom-fit acrylic window inserts that press into existing window frames to reduce noise, drafts, and temperature transfer as a lower-cost alternative to window replacement. The inserts are handcrafted in the USA for homeowners across the US and Canada.
3 investors
iMicrobes uses synthetic biology to develop cost-effective sustainable materials and replace conventional manufacturing processes. The company focuses on circular economy principles, converting waste streams into value through biotechnology.
3 investors
Infinite Composites designs, manufactures and analyzes composite pressure vessels for aerospace, aviation, defense, bulk gas transport and vehicular transportation applications. The products enable efficient storage and transport of pressurized liquids and gases while maximizing payload capacity and minimizing transportation costs.
3 investors
Innovate UK is a government-backed community platform that connects investors, innovators, industries, institutes, and government bodies to fund and scale solutions in emerging technologies and innovation sectors. The platform focuses on financing the Future Economy with emphasis on Net Zero, Health, Agriculture, Digital Technologies, and Diversity and Inclusion across the UK and international markets.
3 investors
Inspire is a clean energy supplier that provides residential customers with 100% renewable energy by purchasing Renewable Energy Certificates (RECs) on their behalf and coordinating with local utilities to take over as the energy supplier without service interruption. It serves households in the United States seeking a lower-carbon energy option through their existing utility bill.
3 investors
Interface Fluidics develops microfluidic technology for the energy industry, specifically high-pressure PVT (pressure-volume-temperature) systems for fluid analysis.
3 investors
InventWood produces SUPERWOOD, a wood-based structural material engineered at the nanoscale to be stronger than steel while lighter, offering properties like fire resistance and transparency for use in construction and buildings. Spun out of research at the University of Maryland and Yale, it operates a manufacturing facility in Maryland.
3 investors
Ionworks provides a Battery Simulation OS that combines physics-based electrochemical modeling with machine learning for battery R&D. The platform turns cycler data into validated models and generates labeled datasets for ML methods, serving cell makers, OEMs, and battery researchers.
3 investors
Jaipur Robotics develops automation and digitization solutions for the waste-to-energy industry, converting non-recyclable waste into electricity, heat, and raw materials through controlled incineration processes. The company uses data, AI, and computer vision to optimize waste management operations.
3 investors
Jetson helps North American homeowners replace fossil-fuel heating and cooling systems with electric heat pumps, handling the installation process directly rather than through traditional contractors. It focuses on making home electrification cheaper and simpler while cutting energy use and emissions.
3 investors
Karman Industries builds the Heat Processing Unit (HPU), a modular thermal management system designed to cool high-power AI data center chips while eliminating water use and enabling heat reuse for power generation and district heating. It targets operators of AI data centers and industrial energy systems seeking more efficient cooling.
3 investors
KBCols Sciences is a biotech studio that manufactures Non-GMO natural biocolors extracted from India's biodiversity. Its sustainable, reproducible colors are aimed at applications including fashion/textiles, personal care, food, and feed.
3 investors
King Energy develops software and financing solutions for commercial solar installations on multi-tenant properties. The company provides billing software (King Energy OneBill) that enables shared solar energy across multiple businesses and manages solar programs nationwide.
3 investors
Kinitics Automation builds all-electric valve actuators, linear actuators, and piston pumps using Shape Memory Alloy (SMA) technology to replace methane-venting pneumatic actuators used at natural gas well sites. Its products serve the energy and process control industries, targeting methane emission reduction and industrial decarbonization, with a focus on North America.
3 investors
KluraLabs develops antimicrobial packaging materials for food that extend shelf life and reduce preservative use, serving retailers, distributors, and manufacturers in the food supply chain.
3 investors
Komham develops microbial technology to decompose organic waste and sells biomass recycling systems based on that research. The company operates in the waste treatment and environmental technology sector in Japan.
3 investors