Union Square Ventures

Founded in 2003, Union Square Ventures is a venture capital firm based in New York. It specializes in early to late-stage investments in internet-focused companies, with a focus on web services creating large networks and innovative use of information technology across industries like media, marketing, fintech, climate tech, and healthcare.

Mona Alsubaei

Analyst

Brad Burnham

Partner

John Buttrick

Partner

Grace Carney

Analyst

Nick Grossman

General Partner

Past deals in CleanTech

Zeitview

Venture Round in 2025
Zeitview is an aerial data analytics company specializing in drone services for energy and infrastructure sectors. It uses AI and machine learning to analyze visual data, providing actionable insights that enhance asset performance and longevity. Zeitview serves industries such as solar, wind, property management, telecommunications, and utilities.

Presto

Seed Round in 2025
Presto is a software platform to power magical charging experiences for fleets, mobility providers, and businesses.We believe that access to reliable and affordable charging is the key to unlocking mass electrification and fighting climate change.

Cactos

Venture Round in 2025
Cactos specializes in smart energy storage systems designed to optimize energy usage and ensure reliable power supply. Their systems are installed on client premises, providing backup power during outages and supporting renewable energy integration.

Bolt.Earth

Series A in 2025
Bolt.Earth is a leading provider of electric vehicle (EV) charging infrastructure solutions in India, operating over 20,000 charging points and focusing on promoting cleaner mobility in emerging markets. The company offers a comprehensive platform that enables users to locate the nearest charging stations conveniently. In addition, Bolt.Earth's technology facilitates over-the-air updates, allowing fleet operators, vehicle owners, and automotive businesses to integrate smart and sustainable services. By developing a robust network and advanced operating systems, Bolt.Earth is committed to enhancing the adoption of electric vehicles and contributing to a greener future.

Radiant

Series C in 2024
Radiant is a clean energy startup based in Los Angeles, California, that specializes in the development of portable nuclear microreactors. Founded in 2019, the company aims to provide an alternative to fossil fuels for both military and commercial applications. Its flagship product, the Kaleidos microreactor, is designed to fit within a shipping container, allowing for transportation by air, ship, and road. This innovative microreactor serves as a zero-emissions power source, making it particularly suitable for remote locations and critical applications where traditional diesel generators are typically used.

Molten Industries

Series A in 2024
Molten Industries specializes in developing clean technology aimed at decarbonizing the hydrogen market. Its innovative platform combines methane-splitting and electrolysis technologies, featuring integrated thermal control and modular design for low-emission performance. This enables various industrial sectors to access cleaner hydrogen inputs with reduced environmental impact and scalable deployment.

Zanskar

Series B in 2024
Zanskar is a geothermal exploration and technology company focused on accelerating the discovery and development of geothermal energy resources. The company utilizes a predictive platform informed by extensive data, which includes subsurface characterization technology and advanced sensing techniques. By integrating artificial intelligence and big data, Zanskar enhances the exploration process and helps clients identify previously unknown geothermal resources, ultimately reducing the risks associated with such endeavors. Through its innovative approach, Zanskar aims to contribute to the advancement of geothermal energy as a sustainable resource.

Anthro Energy

Series A in 2024
Anthro Energy is developing advanced battery technologies to address key challenges in energy storage. They focus on creating ruggedized batteries that enhance safety and enable an electrified future.

Transmutex

Series A in 2024
Transmutex is a Swiss company founded in 2019 that specializes in innovative nuclear technology aimed at significantly reducing existing nuclear waste. The company leverages advanced techniques, including particle accelerators, to transmute long-lived nuclear waste into less harmful materials while simultaneously generating carbon-free energy. This energy can be reintegrated into the power grid or utilized for green hydrogen production. Comprising a diverse team of physicists, computer scientists, and environmentalists, Transmutex is pioneering a new approach to nuclear energy that offers scalable, carbon-free solutions without the typical challenges associated with conventional nuclear power plants.

Ostrom

Series A in 2023
Ostrom facilitates the transition to renewable energy by making it accessible and inclusive for consumers. It offers a digital platform that enables users to effortlessly switch to, track, and reduce their electricity consumption.

CarbonChain

Series A in 2023
CarbonChain is a developer of a carbon accounting platform designed to assist organizations in tracking, reporting, and reducing greenhouse gas emissions throughout their supply chains. The platform is particularly focused on high-emission industries such as metals, mining, agriculture, and manufacturing. By enabling companies to identify their emissions-related transactions, CarbonChain helps them take proactive measures to mitigate their environmental impact and adapt to increasing carbon prices. This capability not only aids firms in understanding the climate implications of their procurement choices but also supports their transition towards a net-zero economy.

Noya

Series A in 2023
Noya develops carbon capture technology that enables industrial facilities to remove CO2 from the atmosphere by retrofitting existing equipment. The company adds a non-toxic CO2 absorbing chemical blend to current cooling towers, allowing simultaneous cooling and carbon capture without major mechanical changes to the towers. The captured CO2 is then sold to companies that use it as a raw material, supporting other industries' climate initiatives. Noya's approach is aimed at accelerating the world’s transition toward a carbon-negative economy by providing a modular, retrofit-based solution that tackles emissions from industrial cooling processes.

Zeitview

Series E in 2023
Zeitview is an aerial data analytics company specializing in drone services for energy and infrastructure sectors. It uses AI and machine learning to analyze visual data, providing actionable insights that enhance asset performance and longevity. Zeitview serves industries such as solar, wind, property management, telecommunications, and utilities.

Ostrom

Series A in 2022
Ostrom facilitates the transition to renewable energy by making it accessible and inclusive for consumers. It offers a digital platform that enables users to effortlessly switch to, track, and reduce their electricity consumption.

Lithos Carbon

Seed Round in 2022
Lithos Carbon is an agricultural carbon removal company focused on developing innovative carbon capture technology for farms. Founded in March 2022 by experienced entrepreneurs and experts in atmospheric geochemistry, the company aims to transform farmland into carbon capture centers, with a goal of removing one billion tons of CO2 from the atmosphere within this decade. Lithos Carbon's technology employs isotope dilution methods and advanced soil models, utilizing mineral weathering techniques that involve spreading basalt on croplands to enhance dissolved inorganic carbon and facilitate long-term storage as ocean carbonates. Their approach not only promotes significant carbon dioxide removal but also enhances crop yields and improves soil conditions. The company's solutions are custom-designed for specific fields and crops, ensuring immediate scalability and empirical effectiveness.

Anthro Energy

Seed Round in 2022
Anthro Energy is developing advanced battery technologies to address key challenges in energy storage. They focus on creating ruggedized batteries that enhance safety and enable an electrified future.

Molten Industries

Seed Round in 2022
Molten Industries specializes in developing clean technology aimed at decarbonizing the hydrogen market. Its innovative platform combines methane-splitting and electrolysis technologies, featuring integrated thermal control and modular design for low-emission performance. This enables various industrial sectors to access cleaner hydrogen inputs with reduced environmental impact and scalable deployment.

Zanskar

Series A in 2022
Zanskar is a geothermal exploration and technology company focused on accelerating the discovery and development of geothermal energy resources. The company utilizes a predictive platform informed by extensive data, which includes subsurface characterization technology and advanced sensing techniques. By integrating artificial intelligence and big data, Zanskar enhances the exploration process and helps clients identify previously unknown geothermal resources, ultimately reducing the risks associated with such endeavors. Through its innovative approach, Zanskar aims to contribute to the advancement of geothermal energy as a sustainable resource.

XFuel

Venture Round in 2022
XFuel is a company focused on producing sustainable and net-zero advanced fuels for the road, marine, and aviation sectors. Founded in 2010 and headquartered in Dublin, Ireland, with additional operations in Palma de Mallorca, Spain, XFuel has developed innovative technology for the efficient conversion of biomass waste into low-carbon fuels. This process results in a clean, drop-in fuel that can be utilized by distributors and consumers globally, offering a cost-effective alternative to traditional fossil fuels. XFuel's production methods lead to up to 85% fewer greenhouse gas emissions compared to conventional fuel production, with a clear pathway towards achieving carbon-neutral and carbon-negative fuel solutions.

Toucan

Seed Round in 2022
Toucan is a company focused on creating technology that facilitates large-scale climate action by enhancing the voluntary carbon market. It develops digital infrastructure aimed at improving transparency and integrity within this market, which is essential for directing funds to effective climate impact projects. By pioneering the use of tokenized carbon credits, Toucan aims to incorporate both established and emerging environmental assets onto the blockchain. The company's overarching goal is to establish a regenerative financial system that addresses climate change while promoting sustainable revenue flows to impactful initiatives.

Shift EV

Series A in 2022
Shift EV is an electric mobility technology startup focused on advancing the adoption of electric vehicles in commercial fleets. The company specializes in the development of electric vehicle batteries and employs proprietary electro-fitting technology to convert conventional vehicles into electric-run models. Shift EV aims to support fleet owners, operators, and financiers by providing critical insights into electric vehicle performance, including operational cost savings, electricity consumption, emissions reduction, available battery range, and mileage. By facilitating the transition to electric-driven fleets, Shift EV contributes to environmental sustainability and the conservation of natural resources, particularly in emerging markets.

Brilliant Planet

Series A in 2022
Brilliant Planet develops algae-based biomass production to permanently sequester carbon at large scale using open-air pond systems on coastal desert land. The approach grows microalgae without fresh water, leveraging natural processes to sequester carbon while supporting ocean and air health, and it also provides a source of protein to meet rising demand.

Radiant

Series A in 2022
Radiant is a clean energy startup based in Los Angeles, California, that specializes in the development of portable nuclear microreactors. Founded in 2019, the company aims to provide an alternative to fossil fuels for both military and commercial applications. Its flagship product, the Kaleidos microreactor, is designed to fit within a shipping container, allowing for transportation by air, ship, and road. This innovative microreactor serves as a zero-emissions power source, making it particularly suitable for remote locations and critical applications where traditional diesel generators are typically used.

Zeitview

Venture Round in 2021
Zeitview is an aerial data analytics company specializing in drone services for energy and infrastructure sectors. It uses AI and machine learning to analyze visual data, providing actionable insights that enhance asset performance and longevity. Zeitview serves industries such as solar, wind, property management, telecommunications, and utilities.

Bolt.Earth

Series A in 2021
Bolt.Earth is a leading provider of electric vehicle (EV) charging infrastructure solutions in India, operating over 20,000 charging points and focusing on promoting cleaner mobility in emerging markets. The company offers a comprehensive platform that enables users to locate the nearest charging stations conveniently. In addition, Bolt.Earth's technology facilitates over-the-air updates, allowing fleet operators, vehicle owners, and automotive businesses to integrate smart and sustainable services. By developing a robust network and advanced operating systems, Bolt.Earth is committed to enhancing the adoption of electric vehicles and contributing to a greener future.

Transmutex

Series A in 2021
Transmutex is a Swiss company founded in 2019 that specializes in innovative nuclear technology aimed at significantly reducing existing nuclear waste. The company leverages advanced techniques, including particle accelerators, to transmute long-lived nuclear waste into less harmful materials while simultaneously generating carbon-free energy. This energy can be reintegrated into the power grid or utilized for green hydrogen production. Comprising a diverse team of physicists, computer scientists, and environmentalists, Transmutex is pioneering a new approach to nuclear energy that offers scalable, carbon-free solutions without the typical challenges associated with conventional nuclear power plants.

Zeitview

Series C in 2021
Zeitview is an aerial data analytics company specializing in drone services for energy and infrastructure sectors. It uses AI and machine learning to analyze visual data, providing actionable insights that enhance asset performance and longevity. Zeitview serves industries such as solar, wind, property management, telecommunications, and utilities.

Remora

Seed Round in 2021
Remora develops carbon capture technology tailored for trains and trucks. Their device extracts at least 80% of a semi-truck's carbon emissions directly from the tailpipe, purifies it, and sells the CO2 to end-users for long-term storage. This generates revenue for fleet operators, enabling reduced emissions and addressing national CO2 shortages.

Zeitview

Series C in 2020
Zeitview is an aerial data analytics company specializing in drone services for energy and infrastructure sectors. It uses AI and machine learning to analyze visual data, providing actionable insights that enhance asset performance and longevity. Zeitview serves industries such as solar, wind, property management, telecommunications, and utilities.

Wren

Seed Round in 2020
Wren is a company that develops a web application designed to assist individuals and organizations in achieving carbon neutrality by tracking and offsetting their CO2 emissions. Founded in 2019 and headquartered in San Jose, California, Wren aims to create tools that empower users to take action against climate change. By offering a subscription service, the company not only provides valuable resources for users but also generates funding to support its ongoing initiatives. Wren's approach focuses on building a sustainable business model to effectively address the challenges posed by climate change.

Zeitview

Series B in 2018
Zeitview is an aerial data analytics company specializing in drone services for energy and infrastructure sectors. It uses AI and machine learning to analyze visual data, providing actionable insights that enhance asset performance and longevity. Zeitview serves industries such as solar, wind, property management, telecommunications, and utilities.

Zeitview

Series A in 2016
Zeitview is an aerial data analytics company specializing in drone services for energy and infrastructure sectors. It uses AI and machine learning to analyze visual data, providing actionable insights that enhance asset performance and longevity. Zeitview serves industries such as solar, wind, property management, telecommunications, and utilities.

Zeitview

Seed Round in 2015
Zeitview is an aerial data analytics company specializing in drone services for energy and infrastructure sectors. It uses AI and machine learning to analyze visual data, providing actionable insights that enhance asset performance and longevity. Zeitview serves industries such as solar, wind, property management, telecommunications, and utilities.

Avoidance of Mass Extinctions Engine

Series B in 2010
AMEE is dedicated to offering credible environmental data for organizations globally, starting with a focus on 2.7 million entities in the UK. The company aims to enhance decision-making regarding resource usage by providing free access to this data. By fostering an open network, AMEE allows organizations to update, compare, and share their environmental information, promoting transparency and collaboration. This platform not only facilitates better understanding and management of environmental risks but also links these risks to immediate financial pressures, encouraging businesses to adopt more sustainable practices. Through its data-driven approach, AMEE aspires to improve overall efficiency and resilience among organizations while driving innovation and responsible resource management.

Avoidance of Mass Extinctions Engine

Series A in 2008
AMEE is dedicated to offering credible environmental data for organizations globally, starting with a focus on 2.7 million entities in the UK. The company aims to enhance decision-making regarding resource usage by providing free access to this data. By fostering an open network, AMEE allows organizations to update, compare, and share their environmental information, promoting transparency and collaboration. This platform not only facilitates better understanding and management of environmental risks but also links these risks to immediate financial pressures, encouraging businesses to adopt more sustainable practices. Through its data-driven approach, AMEE aspires to improve overall efficiency and resilience among organizations while driving innovation and responsible resource management.

Mombak

Mombak is a carbon removal company based in Sao Paulo, Brazil, focused on reforestation of the Amazon. The team brings together experts in science, technology, forestry, and carbon markets to advance large-scale, nature-based climate solutions.

Volteras

Volteras provides a data platform for the energy ecosystem, collecting, standardizing, and optimizing data from hundreds of energy devices into a single data model. Its Volteras Connect service enables businesses to use this data to create new revenue streams, reduce costs, and enable new business models. The platform securely connects vehicles, chargers, and energy systems, supporting location tracking, live charging data, a uniform naming convention, and a consolidated data structure to help automobile businesses access energy-device data and plan fleets.

Bolt.Earth

Bolt.Earth is a leading provider of electric vehicle (EV) charging infrastructure solutions in India, operating over 20,000 charging points and focusing on promoting cleaner mobility in emerging markets. The company offers a comprehensive platform that enables users to locate the nearest charging stations conveniently. In addition, Bolt.Earth's technology facilitates over-the-air updates, allowing fleet operators, vehicle owners, and automotive businesses to integrate smart and sustainable services. By developing a robust network and advanced operating systems, Bolt.Earth is committed to enhancing the adoption of electric vehicles and contributing to a greener future.
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