Mainspring
Series F in 2025
Mainspring Energy, Inc. is a technology company based in Menlo Park, California, that specializes in developing linear generator technology for low carbon, dispatchable energy solutions. Founded in 2010 by three Stanford engineers, the company focuses on creating advanced prototypes that convert fuel into electricity through a unique, low-temperature reaction of air and fuel. This innovative approach allows Mainspring to offer generators that provide affordable, reliable electricity while significantly reducing carbon emissions compared to traditional electric grids. The company's mission is to address climate change and enhance energy accessibility, contributing to the development of net-zero carbon energy systems for the future.
Fervo Energy
Series D in 2024
Founded in 2017, Fervo Energy specializes in developing and operating geothermal assets using proprietary technology. Based in San Francisco, the company generates clean power through innovative geoscience methods, aiming to provide a dispatchable foundation for a 100% clean energy future.
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.
Zap Energy
Series D in 2024
Zap Energy, Inc. is a Seattle-based company that specializes in the design and manufacture of sheared-flow stabilized Z-Pinch fusion reactors for power generation. Founded in 2017, the company focuses on developing compact and scalable fusion technology that offers low-carbon, cost-effective, and flexible energy solutions. Unlike conventional fusion methods, Zap Energy's approach utilizes electric current to create magnetic fields that confine and compress plasma, enhancing the stability and efficiency of the fusion process. This innovative technology aims to provide sustainable energy while requiring less capital investment compared to traditional fusion systems.
Twelve, formerly known as Opus 12, is a Berkeley, California-based company that specializes in recycling carbon dioxide emissions into valuable chemicals and fuels. Founded in 2015, the company has developed innovative technology that can be integrated with any source of CO₂ emissions. By utilizing only water and electricity as inputs, Twelve transforms captured carbon dioxide into essential products such as methane, ethylene, and ethanol. The firm aims to provide a cost-competitive alternative to petroleum-derived chemicals and fuels, thereby addressing carbon emissions while simultaneously creating economically viable solutions.
Fervo Energy
Series D in 2024
Founded in 2017, Fervo Energy specializes in developing and operating geothermal assets using proprietary technology. Based in San Francisco, the company generates clean power through innovative geoscience methods, aiming to provide a dispatchable foundation for a 100% clean energy future.
Equilibrium Energy
Funding Round in 2023
Equilibrium Energy specializes in optimizing energy consumption and reducing costs through its advanced energy management platform. The company aims to facilitate sustainable practices, enhance efficiency for power companies, and contribute positively to the environment.
Fourth Power
Series A in 2023
Fourth Power specializes in utility-scale thermal battery storage solutions. It converts renewable energy into a reliable on-demand power source, addressing grid needs while facilitating the transition to decarbonized infrastructure.
Mach Industries
Series A in 2023
Mach Industries specializes in developing advanced technology solutions for defense systems. The company focuses on producing and combusting hydrogen from field-sourced materials, aiming to enhance global security and supply chain resiliency.
Nium is a climate technology company focused on decarbonizing industry through innovative nanotechnology. The company has developed a nanocatalyst reactor that facilitates the on-site synthesis of ammonia, utilizing renewable energy sources. This system, known as Green Ammonia on Demand, allows for the decentralized production of ammonia, which can be stored and transported efficiently. By integrating its reactor with hydrogen-producing facilities, Nium aims to significantly reduce carbon dioxide emissions, thereby helping industries lower their carbon footprints and contribute to a more sustainable economy.
Amogy specializes in developing carbon-free energy solutions for hard-to-abate sectors such as maritime, power generation, and heavy industry. Its patented ammonia cracking technology converts liquid ammonia into electrical power using hydrogen fuel cells.
Reach designs and delivers long-range wireless power networks that provide scalable and resilient energy infrastructure. Its system transfers power wirelessly, analogous to how Wi-Fi delivers data, through patented technologies such as high-efficiency power beaming circuits, network optimization algorithms, and adaptive electromagnetic surfaces. The platform is designed to be safe, scalable, and easy to use for a range of industries, including manufacturing, government, energy, logistics, and retail. By using radio frequency transmission, its solutions rely on proprietary antenna structures, converter designs, and system architectures to power devices without cables, enabling operations that are not constrained by traditional wiring.
Fervo Energy
Series C in 2022
Founded in 2017, Fervo Energy specializes in developing and operating geothermal assets using proprietary technology. Based in San Francisco, the company generates clean power through innovative geoscience methods, aiming to provide a dispatchable foundation for a 100% clean energy future.
Twelve, formerly known as Opus 12, is a Berkeley, California-based company that specializes in recycling carbon dioxide emissions into valuable chemicals and fuels. Founded in 2015, the company has developed innovative technology that can be integrated with any source of CO₂ emissions. By utilizing only water and electricity as inputs, Twelve transforms captured carbon dioxide into essential products such as methane, ethylene, and ethanol. The firm aims to provide a cost-competitive alternative to petroleum-derived chemicals and fuels, thereby addressing carbon emissions while simultaneously creating economically viable solutions.
Zap Energy
Series C in 2022
Zap Energy, Inc. is a Seattle-based company that specializes in the design and manufacture of sheared-flow stabilized Z-Pinch fusion reactors for power generation. Founded in 2017, the company focuses on developing compact and scalable fusion technology that offers low-carbon, cost-effective, and flexible energy solutions. Unlike conventional fusion methods, Zap Energy's approach utilizes electric current to create magnetic fields that confine and compress plasma, enhancing the stability and efficiency of the fusion process. This innovative technology aims to provide sustainable energy while requiring less capital investment compared to traditional fusion systems.
Amogy specializes in developing carbon-free energy solutions for hard-to-abate sectors such as maritime, power generation, and heavy industry. Its patented ammonia cracking technology converts liquid ammonia into electrical power using hydrogen fuel cells.
Twelve, formerly known as Opus 12, is a Berkeley, California-based company that specializes in recycling carbon dioxide emissions into valuable chemicals and fuels. Founded in 2015, the company has developed innovative technology that can be integrated with any source of CO₂ emissions. By utilizing only water and electricity as inputs, Twelve transforms captured carbon dioxide into essential products such as methane, ethylene, and ethanol. The firm aims to provide a cost-competitive alternative to petroleum-derived chemicals and fuels, thereby addressing carbon emissions while simultaneously creating economically viable solutions.
Amogy
Funding Round in 2021
Amogy specializes in developing carbon-free energy solutions for hard-to-abate sectors such as maritime, power generation, and heavy industry. Its patented ammonia cracking technology converts liquid ammonia into electrical power using hydrogen fuel cells.
Reach designs and delivers long-range wireless power networks that provide scalable and resilient energy infrastructure. Its system transfers power wirelessly, analogous to how Wi-Fi delivers data, through patented technologies such as high-efficiency power beaming circuits, network optimization algorithms, and adaptive electromagnetic surfaces. The platform is designed to be safe, scalable, and easy to use for a range of industries, including manufacturing, government, energy, logistics, and retail. By using radio frequency transmission, its solutions rely on proprietary antenna structures, converter designs, and system architectures to power devices without cables, enabling operations that are not constrained by traditional wiring.
Citrine Informatics
Series A in 2017
Citrine Informatics, Inc. is a software company based in Redwood City, California, with an additional office in Pittsburgh, Pennsylvania, founded in 2013. It specializes in materials informatics by developing an artificial intelligence platform that aggregates extensive data on materials, chemicals, and devices. This platform leverages machine learning and data science to enhance research and development, manufacturing, and supply chain operations for organizations involved in producing physical products. By streamlining the materials development process, Citrine Informatics aims to facilitate the discovery of new materials and reduce defects early in the research phase, thus improving product growth and design. The company's focus spans various sectors, including energy, aerospace, and electronics.