Cleantech Startups
5,220 companies tagged Cleantech, with their investors and founders.
Odyssey unlocks capital for the distributed energy sector in growth markets, enabling clean energy projects to be developed and financed faster. The company works with governments, donors, and concessional finance partners to scale renewable energy infrastructure across emerging markets.
6 investors
Ofload offers a Carbon Analytics Platform that tracks and reports logistics carbon emissions using the GLEC-accredited methodology, giving shippers real-time dashboards to measure Scope 3 emissions and set reduction targets. It serves shippers using Ofload's freight services.
6 investors
Osmoses develops a membrane technology for purifying and separating gas molecules, aimed at making industrial gas separation processes more energy-efficient. It targets industrial separation applications tied to the energy transition and decarbonization.
6 investors
A company working on energy storage solutions.
6 investors
PathSpot provides a health and safety operating system for restaurants, commercial kitchens, food manufacturers, and foodservice operations. The platform combines hardware and cloud-based software to deliver real-time analytics, compliance monitoring, and actionable recommendations to reduce health and safety risks.
6 investors
Prometheus Fuels develops systems that convert intermittent renewable energy into liquid fuels for remote electrification. The ULDES and Fuel Forge systems operate independently from the grid, storing energy as liquid fuels when renewable power is available.
6 investors
Puraffinity develops adsorbent media engineered for the removal of PFAS from water, offered as bulk media, pre-filled vessels, or full treatment services. It serves municipalities, industrial clients, environmental service providers, and remediation sites, targeting applications including drinking water, wastewater, landfill leachate, and contaminated groundwater.
6 investors
Quaise Energy develops superhot geothermal drilling technology using millimeter-wave powered drilling to access deep geothermal energy sources at unprecedented depths and temperatures for large-scale clean power generation globally.
6 investors
Quilt makes a ductless heat pump system for residential heating and cooling, including indoor and outdoor units, a control dial, and an app with room-by-room temperature control and occupancy sensing. The all-electric system is sold to homeowners and installed through a certified partner network across North America.
6 investors
Renaissance Fusion builds stellarators—magnetic-confinement fusion machines—using High Temperature Superconducting (HTS) magnets and liquid metal shields to enable clean energy generation. It is a continental European fusion startup working to industrialize its core technologies for real-world energy grid deployment.
6 investors
Rubi develops biotechnology solutions for sustainable manufacturing in the fashion and textiles industry. The company uses scientific innovation to reduce environmental impact from industrial manufacturing processes.
6 investors
Seabound develops an onboard carbon capture system for maritime vessels that locks CO₂ emissions into solid carbonate pebbles for offloading and storage, enabling shipowners to reduce greenhouse gas emissions from their fleets.
6 investors
Sense provides energy management software and hardware that connects consumers and utilities through intelligent monitoring and insights. The company serves residential consumers and electricity providers to improve grid management and reduce energy consumption through home energy monitoring and smart meter integration.
6 investors
Sepion develops advanced polymer separator technology for batteries and other applications including water separation and materials recovery. The company commercializes research from Berkeley Lab with manufacturing and production capabilities in Silicon Valley.
6 investors
SewerAI provides an AI platform for underground infrastructure inspection, turning CCTV and MACP footage into automatically coded defect data, risk scores, and capital rehabilitation plans. It serves cities, utilities, and engineering firms managing sewer and manhole inspection programs across the United States.
6 investors
Sheets & Giggles manufactures sustainable lyocell bedding made from eucalyptus wood pulp, using significantly less water and energy than conventional cotton production. The company sells direct-to-consumer bedding products with a focus on environmental sustainability and customer service.
6 investors
Sofar operates an ocean monitoring network and analytics platform serving maritime shipping companies and marine researchers. The company operates Spotter, a network of ocean sensors for data collection, and Wayfinder, a voyage optimization platform that helps shipping companies reduce fuel consumption and emissions by 4-9%.
6 investors
Solideon is a manufacturing platform specializing in bespoke aerospace vehicle production, including custom-designed aircraft and components. The company serves aerospace customers and positions itself as the world's only large-scale manufacturer capable of crafting a variety of aerospace vehicles using advanced manufacturing techniques.
6 investors
sonnen builds home energy systems centered on the sonnenBatterie storage unit, along with EV chargers, electricity tariffs, heat pump integration and an app for managing solar energy production and consumption. It serves residential customers in Germany and operates the sonnenVPP virtual power plant that lets battery owners help stabilize the grid.
6 investors
Sora Fuel produces sustainable aviation fuel (SAF) and diesel using a proprietary closed-loop direct air capture and conversion process that draws carbon from air rather than biomass or industrial feedstocks. It targets the aviation and transportation fuel market as an alternative to feedstock-dependent fuel production.
6 investors
SparkCharge develops mobile off-grid electric vehicle chargers and operates a charging network for EV users. The company focuses on making EV charging more accessible and reducing carbon emissions in the mobility sector.
6 investors
Sunrun provides residential solar panels and battery storage systems to homeowners, offering installation, monitoring, maintenance, and financing plans such as leases and monthly subscription options. It operates across the United States, serving over one million homes.
6 investors
Terradot develops Enhanced Rock Weathering (ERW) technology to accelerate natural carbon removal by combining rainwater with silicate rocks, permanently sequestering atmospheric CO₂ at scale. The company combines scientific research, technology innovation, and commercial deployment to address climate mitigation, beginning with projects in Brazil's tropical regions.
6 investors
TLM builds and operates a network of regional sawmills that process timber and strengthen the domestic lumber supply chain. The company's repeatable technology platform addresses timber utilization and supports rural economic development and forest health.
6 investors