Cleantech Startups
5,222 companies tagged Cleantech, with their investors and founders.
1KOMMA5Β° provides residential energy systems that combine solar panels, heat pumps, battery storage, and EV wallboxes, coordinated by its Heartbeat AI software to optimize electricity use and offer dynamic, individualized electricity pricing. It serves homeowners through a network of regional installation businesses and showrooms across Germany and Europe.
3 investors
2S Water makes the AquaValid sensor, which provides automated, real-time monitoring of dissolved metal concentrations in water for mining, extraction, and industrial facilities. It supports process control, environmental compliance monitoring, equipment protection, and delivers a continuous water-chemistry data stream for AI and control systems.
3 investors
8inks develops a multilayer curtain coating process for battery electrode manufacturing, enabling layered cell architectures in a single coating line to improve energy density, cycle life, and cost. It serves battery makers across applications such as automotive, aviation, drones, consumer electronics, and stationary storage, offering pilot projects, contract manufacturing, and production system implementation.
3 investors
Accelerate Wind develops edge-of-roof wind turbine technology for commercial and industrial customers globally, enabling local energy generation by harnessing wind channeled by building structures. The company builds hardware solutions to make small-scale wind energy cost-effective and accessible for businesses seeking on-site renewable energy.
3 investors
Acelfil develops industrial filtration systems designed to handle variable and spiking suspended-solids loads without manual operator intervention, aiming to reduce equipment shutdowns and downstream membrane damage. The product targets industrial water/wastewater treatment plant operators.
3 investors
Actasys develops ActaJet air-jet cooling technology that provides spot-on thermal management for high-density data center server racks and components such as Network Interface Cards, Data Processing Units, and Switches. The ultra-compact, energy-efficient system targets data centers running AI and high-rate data processing workloads.
3 investors
Active Surfaces develops flexible, thin-film solar panels using organic and perovskite photovoltaic materials and roll-to-roll manufacturing, aimed at deploying solar in locations where conventional rigid panels are unsuitable. The company builds on printed electronics and materials research to make lightweight solar for remote and unconventional surfaces.
3 investors
ACTUAL co-develops commercial-scale energy infrastructure projects, working from early stages to turn them into financeable, bankable assets. It uses machine-learning, statistical, and physics-based modeling to design projects around required outcomes, collaborating with stakeholders such as feedstock providers, off-takers, and governments.
3 investors
Adden Energy develops solid-state, dynamically-stable batteries based on self-healing separator technology discovered at Harvard, aimed at fast charging, long lifetime, and non-flammable components. The batteries target electric vehicles, automakers, and other applications including drones, data centers, and robotics.
3 investors
Aeromutable develops active flow control technology that dynamically alters the aerodynamic behavior of heavy vehicles to reduce drag, cut fuel consumption, and improve maneuverability and safety. The technology targets trucking fleets seeking to lower operational costs and carbon footprint.
3 investors
Aionics uses artificial intelligence and physics-based simulation to design and screen new material formulations, focusing on high-performance battery chemistries and electrolytes. It serves industries including electric vehicles, aerospace and aviation, long-duration energy storage, and decarbonized manufacturing.
3 investors
Aira provides clean energy solutions centered on heat pumps, making renewable heating technology accessible and affordable for residential homes across Europe.
3 investors
AirEx makes Floorvent, a smart underfloor ventilation and draught-proofing product that reduces heat loss through suspended floors, improving SAP scores and EPC ratings. It is aimed at social landlords, local authorities, and retrofit installers delivering energy-efficiency upgrades under UK funding schemes such as ECO4 and Warm Homes.
3 investors
Airhive develops low-cost direct air capture (DAC) technology using fluidised beds, a mineral sorbent, and an electric calciner to remove CO2 from ambient air. It supplies carbon removal credits, CO2 for industrial uses such as beverage carbonation and sustainable aviation fuel, and modular DAC units and technology licensing, with large-scale deployment planned in the UK.
3 investors
Airthium manufactures high-temperature industrial heat pumps that reach up to 550Β°C and operate in hybrid mode, switching between electricity and gas to optimize cost and carbon emissions. The system is designed for industrial process heat applications requiring reliable 24/7 operation in the 150β550Β°C range.
3 investors
Albotherm develops a heat-activated coating for adaptive glazing that changes transparency in response to temperature, validated in commercial greenhouse trials and in development for the built environment, energy, and mobility surfaces. It targets horticulture growers, commercial building glazing, and PV/vehicle applications as a passive alternative to chalk shade paint and electrochromic or motorised systems.
3 investors
alcemy provides software that uses cement producers' lab data to predict cement strength in real time and automate recipe and mill fineness decisions, aiming to reduce clinker content and cut CO2. It also tracks concrete batches from plant to construction site, monitoring consistency, water additions, and delivery performance for cement and concrete manufacturers.
3 investors
Allumia helps utilities design and manage energy efficiency programs from launch through measured results, and helps small and medium-sized businesses cut energy use through lighting, HVAC, and refrigeration upgrades. It also supports organizations in funding and running efficiency initiatives to meet sustainability and clean energy goals.
3 investors
Alta develops mining technology aimed at securing critical mineral supply chains, based on technology licensed from Lawrence Livermore National Laboratory and co-developed with researchers at Pennsylvania State University. The company focuses on strengthening U.S. competitiveness in critical mineral production.
3 investors
alterBiota develops green materials and energy technologies, including bio-graphene concrete admixtures and low-carbon concrete solutions, along with related R&D and testing services. The company focuses on decarbonizing cement and concrete and converting mined ore and waste tailings into value-added industrial materials.
3 investors
AlternΕ develops thermal energy storage systems, including sand-based thermal batteries, to provide low-carbon heat for agricultural, industrial, and residential use. It offers plug-and-play and custom installations with financing options such as Heat-as-a-Service.
3 investors
Altiro Energy develops an iron-based energy storage system that stores renewable or excess energy as reusable CO2-free iron fuel and later releases it as on-demand heat or power, producing rust that is recharged for the next cycle. It targets large renewable energy producers seeking to stockpile and distribute energy to consumers.
3 investors
AM Batteries develops Powder to Electrode dry coating technology for lithium-ion electrode manufacturing, reducing solvent use and energy consumption compared to traditional slurry methods. The technology targets battery manufacturers seeking to lower capital and operating costs while improving production efficiency.
3 investors
Ambient Fuels develops and finances green hydrogen projects across the US and internationally, handling site feasibility through production of hydrogen derivatives such as eFuels and ammonia. It serves industrial customers seeking to buy hydrogen gas or fully financed hydrogen projects for heavy industry use cases.
3 investors