Cleantech Startups

EX-Fusion is a Japanese private company developing laser-based nuclear fusion energy technology, aiming to decarbonize existing energy sources and contribute to carbon neutrality. It also develops advanced optical control technology derived from its fusion research to build new light-based industries.

5 investors

Factorial develops solid-state batteries for electric vehicles, supplying prototype and sample cells to global automotive OEMs for testing. Spun out of a company founded from Cornell University research, it focuses on lithium-metal solid-state battery technology and related recycling and supply-chain solutions.

5 investors

Florrent develops bio-based supercapacitors with higher energy density than standard supercapacitors, aimed at short-duration power quality and reliability applications such as data center backup power, grid reliability, and renewables firming. Its active material is derived from domestic biomass waste sourced through a network of Black and Indigenous farmers.

5 investors

Flowcarbon provides financing solutions including project finance, private credit, and transferable tax credits for infrastructure, waste-to-value, and niche energy sectors. The firm specializes in capital solutions for frontier industries.

5 investors

Forge installs and services residential heat pumps for heating and cooling, guiding homeowners through system selection, design, installation, and Mass Save rebates. It serves homeowners across Massachusetts.

5 investors

FREDsense builds portable, field-ready sensors and lab services to detect PFAS and other chemical contaminants in water, including an on-site PFAS field test kit and a 5-day PFAS lab analysis service. It serves environmental consultants, technology developers, municipalities, utilities, and non-profits for water quality monitoring and treatment optimization.

5 investors

Generate Capital is a sustainable infrastructure investment and operating platform that provides capital and expertise for developers, businesses, and communities to invest in and operate sustainable assets across power, mobility, waste, green digital, water, agriculture, and industrial decarbonization sectors. The firm has invested over $10 billion since 2014 and manages over 2,000 assets globally.

5 investors

Global Neighbor uses patented directed energy technology to control weeds and stimulate crop growth without chemicals, offering products such as a harvest weed seed control unit (bSCU) and a seed priming system for farmers. Its tools serve conventional and organic agricultural producers seeking to reduce herbicide use, improve soil health, and increase yields.

5 investors

GoBolt operates a supply chain network for merchants, providing warehousing, pick and pack, shipping, and last-mile delivery through a network of warehouses across North America and custom-built apps. The company offers carbon-neutral deliveries by prioritizing electric vehicles and offsetting emissions when needed.

5 investors

GridPoint develops building energy management and optimization technology for commercial buildings, aimed at reducing energy consumption, decarbonizing facilities, and supporting grid modernization. It serves commercial sectors such as retail and quick service restaurants through hardware, cloud software, and energy management services.

5 investors

Hammerhead makes Karoo, a cycling computer device for recording and displaying ride data, routes, and workouts. The product is now operated under SRAM ownership.

5 investors

Helion develops fusion energy systems designed to generate clean electricity for commercial use. The company builds pulsed magnetic fusion prototypes with applications for industrial and commercial electricity generation.

5 investors

Heron Power develops power electronics and energy storage systems, leveraging expertise in software and manufacturing. The company is led by Drew Baglino, former Tesla executive responsible for battery and power systems development.

5 investors

HILOS develops digital design and manufacturing tools for footwear brands and designers, serving major fashion companies and independent creators. The company focuses on 3D design, manufacturing, and commercialization capabilities within the footwear industry.

5 investors

Hometree provides energy services and solutions to help homeowners and landlords decarbonise their residential properties in the UK. The company operates a subscription model focused on residential heating solutions and has served over 100,000 customers.

5 investors

HST Powers develops software for clean energy project development, optimization, and procurement, serving clean energy developers building large-scale projects. The platform helps assess and build projects that deliver clean energy to the grid.

5 investors

Hullbot operates an autonomous underwater robotics service that frequently cleans ship hulls, propellers, and niche areas to remove biofouling, reducing drag and fuel consumption for fleet operators. It also provides routine inspections and asset intelligence on vessel performance and hull condition, and offers its service globally.

5 investors

Humble Sustainability is a Philippine climate technology company that helps businesses resell and recirculate used IT equipment such as laptops, monitors, desktops, and phones to keep them out of landfills. It also provides climate impact data to support clients' ESG initiatives.

5 investors

Hydroleap develops electrochemical water treatment technology that replaces traditional chemical-intensive processes for wastewater treatment across industries including data centers, food and beverage production, and pharmaceuticals. The company serves industrial businesses seeking cost-effective and sustainable alternatives to conventional water treatment methods.

5 investors

INERATEC produces synthetic fuels and chemicals from CO₂ and renewable hydrogen using microstructure technology, offering e-SAF, e-diesel, and other drop-in ready fuels and chemical products for energy and manufacturing industries.

5 investors

KETOS develops an automated water quality and monitoring platform combining hardware, connectivity, software, and services to test water safety and efficiency for cities and businesses. The company replaces manual, slow testing processes with real-time intelligence for leak detection, usage monitoring, and composition analysis.

5 investors

Last Energy develops modular micro nuclear power plants designed to reduce deployment time and cost. The company targets decarbonization of global energy production and increased access to reliable power through scaled nuclear technology.

5 investors

LI-IND develops patent-protected, closed-loop production technology for making low-cost, high-performance battery materials. The company automates traditionally manual processes to reduce economic and environmental costs and secure the supply of critical battery materials.

5 investors

LineVision provides a grid intelligence platform offering Dynamic Line Ratings and situational awareness for electric utilities, using contactless edge sensors to monitor transmission lines and forecast capacity. Its NexusIQ portal turns real-time and environmental data into insights for utility operators and planners in the U.S. and U.K.

5 investors