Cleantech Startups
5,220 companies tagged Cleantech, with their investors and founders.
Rewind performs permanent carbon removal by backfilling mine voids with sustainably sourced biomass, which simultaneously fulfills mine reclamation obligations for the mining industry. It monitors sealed chambers with digital MRV and issues third-party certified carbon removal credits under Isometric's BSSM module.
3 investors
Rhizocore Technologies develops mycorrhizal fungal inoculum products to enhance plant growth, woodland restoration, and ecosystem resilience. The company serves forestry, agriculture, and ecosystem restoration sectors with biotech solutions for carbon-negative forest productivity.
3 investors
Rhythmos.io, now part of Electron, provides analytics tools that give insight into distributed energy resource (DER) location and grid impact for intelligent energy delivery and use.
3 investors
RISE Robotics develops RISE® Cylinder, a fluid-free electro-mechanical alternative to hydraulic cylinders for heavy equipment and machinery that uses belt technology to deliver hydraulic-like forces with significantly greater energy efficiency. The company serves industrial machinery manufacturers and operators seeking to reduce energy consumption and maintenance costs in equipment ranging from liftgates to construction machinery.
3 investors
Rock Rabbit provides an AI-powered platform that simplifies the application, verification, and payment of energy efficiency incentives for contractors, installers, and equipment manufacturers. The company streamlines the incentive claim process to accelerate residential building electrification and energy upgrades.
3 investors
RTDT develops Aerosense, a wireless, ultra-thin sensor patch that retrofits onto wind turbine blades to capture high-frequency aero-structural data, paired with analysis modules and dashboards. The system serves wind turbine operators and designers for design, control, operations, and risk management.
3 investors
Rubicon provides tech-enabled waste and recycling services to national brands, small and independent businesses, contractors, and households, offering a platform to track service levels, equipment, pickups, and costs across locations. It also runs Technical Advisory Services for site audits, material recovery, and zero waste program design to help organizations meet sustainability goals.
3 investors
Safire develops hardware and software for energy systems, including resilient battery design, ruggedized sensing, secure communications, and an AI-powered energy operating system for real-time monitoring and control. The company targets critical energy infrastructure applications.
3 investors
Sage Geosystems develops pressure geothermal technology to generate energy from the earth's subsurface heat, drawing on decades of experience drilling wells worldwide. The company operates in the geothermal energy sector, aiming to provide sustainable power generation.
3 investors
Salient Energy manufactures zinc and manganese batteries for electricity storage, providing an alternative to lithium-ion with lower costs and reduced environmental impact from mining and manufacturing.
3 investors
Sanivation partners with local governments and water utilities in African secondary cities to manage waste safely. Its work focuses on sanitation and waste management, with stated goals of cleaning cities, creating jobs, and mitigating climate change.
3 investors
SensorFlow provides an IoT-based energy management platform for hotels, offering guest room automation devices and tools (SmartGRD, SmartBEA, SmartREM) to monitor and optimize electricity, water, gas, and waste consumption. It serves hotel operations, sustainability, and management teams looking to reduce costs, improve energy efficiency, and report ESG metrics.
3 investors
Sentra.world offers an AI-powered SaaS platform for carbon accounting, emissions monitoring, and automated CBAM/CCTS compliance reporting across supply chains, targeting metals and engineering producers such as the steel industry. It also provides consultancy services and a marketplace for green products, and is recognized as an official CBAM consultant by EEPC India.
3 investors
SepPure Technologies develops nano-filtration membrane technology that replaces conventional energy-intensive chemical separation processes, reducing solvent use, energy consumption, and emissions. It serves industrial chemical manufacturers seeking cleaner separation methods.
3 investors
ShineFusion develops fusion energy technology, pursuing a step-by-step commercialization approach that generates revenue from intermediate applications to fund progress toward clean fusion power.
3 investors
Sirona builds modular Direct Air Capture systems that use solid sorbents to remove CO2 from the air, then hands the captured CO2 to partners who inject it into basalt rock for permanent mineralized storage. The company deploys projects in regions with renewable energy and storage capacity, using sensor-based measurement and third-party verification to sell carbon removal to organizations offsetting unavoidable emissions.
3 investors
Sirrus develops chemical building blocks based on patented methylene malonate monomers and oligomeric crosslinkers that polymerize anionically at ambient temperatures. Its technology targets high-performance coatings, adhesives, sealants, binders and other polymer products for chemical industry partners.
3 investors
Snowfox Discovery is a natural hydrogen exploration company developing technology to locate and unlock naturally occurring hydrogen in the geological subsurface. It aims to supply natural hydrogen as a feedstock for ammonia, fertiliser, and metal and fuel refining to support the energy transition.
3 investors
SOLARCYCLE provides recycling services for solar farm components including solar panels, inverters, transformers, cables, and other power electronics, diverting waste from landfills and recovering metals such as silver, copper, gold, and lead. It serves solar companies in the US with certified recycling, refurbishment, and reporting for clean energy circularity.
3 investors
Solarize offers a cloud-based, API-first billing platform for decentralized energy business models such as tenant electricity (Mieterstrom), community building supply, energy sharing, and on-site PPAs. It serves utilities, municipal energy providers (Stadtwerke), property owners, and energy contractors, primarily in Germany.
3 investors
Solfácil is a Brazilian solar energy company that provides financing, photovoltaic equipment distribution, and technology tools for solar installers across the country. It serves a network of solar integrator partners with equipment such as panels, inverters, batteries, and monitoring systems for residential, commercial, industrial, and agricultural projects.
3 investors
Solidec builds autonomous electrolyzer-based generators that use air, water, and electricity to produce essential chemicals on site and on demand, removing supply-chain, delivery, and storage burdens. The company develops electrochemical reactor technology for sustainable, emissionless chemical and fuel manufacturing.
3 investors
Solutum Technologies develops a proprietary sustainable material designed as an alternative to single-use flexible plastic packaging, engineered to support recycling, industrial composting, and full biodegradation in soil and water without leaving microplastics or toxic residues. It targets brands and packaging producers seeking to reduce plastic pollution while maintaining performance and cost.
3 investors
Soraa makes LED lighting products focused on color rendering, offering deeper reds, accurate whites, and dimming with reduced blue light. Its lighting emphasizes color performance in an energy-efficient package.
3 investors