Cleantech Startups
5,227 companies tagged Cleantech, with their investors and founders.
Solarcore is a materials technology company developing ultra-thin, aerogel-based thermal insulation for use across industries including HVAC, battery and energy storage systems, automotive, marine, apparel, and footwear. Its proprietary insulation applies NASA-licensed aerogel material in foam to deliver temperature control with minimal thickness.
12 investors
Valar Atomics is developing and scaling high-temperature gas nuclear reactors for grid-independent applications including hydrogen production, data center power, and clean hydrocarbon fuel production.
12 investors
Aerones provides robotic inspection, cleaning, coating, and repair services for wind turbine blades. The company serves wind park operators in the renewable energy sector.
11 investors
Antares Industries develops nuclear reactor technology, with teams spanning nuclear, reactor hardware, and mission engineering as well as manufacturing and regulatory operations. The company works in the nuclear energy and deeptech sector.
11 investors
Bloom Energy manufactures solid oxide fuel cell systems for onsite power generation at commercial, industrial, and data center facilities. The company serves enterprises and infrastructure operators seeking reliable, resilient power with lower emissions.
11 investors
BurnBot builds purpose-built, remotely controlled machines and services for wildfire mitigation, fuels management, vegetation control, and timber operations. It serves infrastructure operators, communities, agencies, and ecological partners looking to reduce fire risk while protecting land and ecosystems.
11 investors
Crux is a capital platform that modernizes financing for clean energy and critical infrastructure projects through advisory, investment, technology, and intelligence services. The platform serves project developers, financial institutions, and investors seeking to deploy capital in the clean economy.
11 investors
.png)
Exowatt builds modular clean energy infrastructure systems designed for 24/7 solar power generation, targeting global AI infrastructure and critical industries that require reliable, ultra-low-cost sustainable power. The company manufactures its systems in the United States.
11 investors
Harbinger Motors designs and manufactures electric vehicles built on medium-duty platforms for commercial and industrial transportation. The company focuses on electrification of the medium-duty vehicle segment to provide cleaner mobility solutions for commercial operators.
11 investors
Intramotev develops battery-electric retrofit technology for rail transportation, converting traditional railcars into independently-moving, self-propelled vehicles that reduce operational costs and emissions.
11 investors
it's electric develops curbside electric vehicle charging infrastructure that draws power from adjacent buildings, aimed at accelerating electrified transportation for cities across the U.S. The company focuses on deploying EV charging within the urban built environment.
11 investors
Oklo develops next-generation fast fission reactors for producing clean electricity at scale, with a focus on safety features and the ability to use recycled nuclear waste as fuel. The company's Aurora reactor is designed to generate up to 75 megawatts of electrical power.
11 investors
11 investors
ZeroAvia develops hydrogen-electric powertrain technology for aircraft, aiming to enable zero-emission aviation. It operates in the aerospace and clean transportation sector.
11 investors
Boston Metal develops Molten Oxide Electrolysis (MOE), an electrified process for producing steel and other metals from a range of oxide feedstocks without direct emissions. The company targets industrial metals and critical-metals production, operating from Massachusetts with a subsidiary in Brazil.
10 investors
Brimstone develops co-production processes to manufacture cement, steel, aluminum, and other critical minerals from a single feedstock in an integrated facility. The company targets heavy industry producers seeking lower-cost, more sustainable production methods for materials essential to construction and manufacturing.
10 investors
Cleancult produces cleaning products in recyclable, paper-based refillable bottles with transparent, non-toxic formulas. The company targets consumers seeking sustainable household cleaners as an alternative to conventional plastic-packaged products.
10 investors
David Energy builds technology to enable electricity grids powered by 100% clean, renewable energy. The company serves residential and business customers seeking to transition away from fossil fuel-dependent electricity systems.
10 investors
Enertiv provides a software platform for real estate portfolios to automate sustainability reporting, compliance, and utility data collection, and to manage decarbonization, energy optimization, tenant utility billing, and maintenance. It serves real estate owners and sustainability teams, having started with building equipment monitoring hardware before expanding into a broader operations platform.
10 investors
General Fusion develops Magnetized Target Fusion (MTF) technology, combining plasma physics, mechanical compression, and liquid metal systems to build a practical, cost-competitive fusion power plant. The company operates large-scale demonstration machines, including LM26 at its Vancouver facility, on a roadmap toward a first fusion plant producing energy in the mid-2030s.
10 investors
Heirloom operates Direct Air Capture (DAC) facilities that use limestone and carbon mineralization technology to permanently remove CO2 from the atmosphere at scale. The company combines natural limestone carbonation with engineering to create verifiable, low-cost carbon removal solutions powered by renewable energy.
10 investors
Kadeya operates a closed-loop beverage dispensing system that bottles drinks on demand in workplace settings and collects bottles for cleaning and reuse, eliminating single-use plastic waste. The system serves construction sites, offices, and other workplaces seeking to reduce packaging waste and improve employee hydration and wellness.
10 investors
TIER operates a shared electric micromobility service (e-scooters and related vehicles) available in over 400 cities across Europe and the Middle East. Founded in 2018 and merged with Dott in 2024, the company runs its operations in-house with a focus on safe, low-carbon urban transport.
10 investors
Vammo offers electric motorcycles on a subscription model with a battery-swapping network, letting riders exchange a depleted battery for a charged one in under a minute and providing preventive maintenance and 24-hour support. It targets urban commuters and riders in large Brazilian city centers.
10 investors