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.
Terra AI
Seed Round in 2023
Terra's AI platform models and optimizes complex natural resource projects, enabling faster designs, reduced capital costs, and improved energy/resource output for large-scale developments.
Caelux is a renewable energy company based in Pasadena, California, founded in 2014. It specializes in developing and manufacturing perovskite-on-glass technology for the terrestrial solar and commercial space industries. This innovative technology is designed to enhance solar device efficiency while minimizing the amount of semiconducting material required, thereby reducing production costs. Caelux's products improve power production and integrate seamlessly into existing photovoltaic module manufacturing processes, allowing users to lower installed costs and boost overall performance.
Realta Fusion
Seed Round in 2023
Realta Fusion develops fusion energy technology for industrial heat and power production. It combines advancements in superconducting materials, plasma physics, and computing power in a simple linear fusion reactor design, utilizing abundant fuel sources to generate zero-carbon heat and power.
Founded in 2005, LanzaTech is a pioneering carbon recycling company that converts industrial waste gases into fuel ethanol and other valuable products. Its innovative bio-catalytic toolkits enable gas fermentation microbes to recycle carbon emissions from sources like steel mills and landfills, reducing reliance on fossil fuels and supporting a circular economy.
Mainspring
Series E in 2022
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.
Mainspring
Series E in 2022
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.
Gaiascope
Seed Round in 2021
Gaiascope, Inc. is a software-as-a-service company based in Brooklyn, New York, that specializes in developing innovative analytics solutions for the energy industry. Founded in 2019, Gaiascope employs machine learning techniques to analyze large datasets, enabling energy companies and investors to better understand and navigate the complexities of the electric grid. Their user-friendly software provides critical insights, including locational marginal pricing, grid constraints, and demand forecasts, facilitating more informed decision-making in real-time trading, operations, and development. Gaiascope emphasizes transparency in its tools, which are designed to optimize the management of power markets while addressing the challenges posed by increasing renewable energy integration and evolving market dynamics.
Mainspring
Series D in 2021
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.
Commonwealth Fusion
Series A in 2020
Founded in 2017, Commonwealth Fusion is a research company developing fusion energy through an inexhaustible power plant. It combines proven physics with revolutionary superconducting magnet technology to accelerate the path to commercial fusion energy.
Commonwealth Fusion
Series A in 2019
Founded in 2017, Commonwealth Fusion is a research company developing fusion energy through an inexhaustible power plant. It combines proven physics with revolutionary superconducting magnet technology to accelerate the path to commercial fusion energy.
Mainspring
Series C in 2018
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.
SunFunder
Series B in 2015
SunFunder Inc. is a solar energy finance company based in San Francisco, California, that specializes in providing various forms of financing to solar energy enterprises, particularly in emerging markets. Founded in 2012, the company offers short-term working capital, inventory, construction, and structured finance loans to solar product distributors, manufacturers, and project developers primarily in East and West Africa, as well as Asia. SunFunder's mission is to catalyze the development of solar energy infrastructure by leveraging its expertise in the solar market and facilitating efficient due diligence processes. By acting as a financial intermediary, SunFunder enables investors to engage in high-impact, fixed-income debt offerings that support the growth of solar assets in regions with inadequate energy access.
LanzaTech
Series D in 2014
Founded in 2005, LanzaTech is a pioneering carbon recycling company that converts industrial waste gases into fuel ethanol and other valuable products. Its innovative bio-catalytic toolkits enable gas fermentation microbes to recycle carbon emissions from sources like steel mills and landfills, reducing reliance on fossil fuels and supporting a circular economy.
SunFunder
Series A in 2014
SunFunder Inc. is a solar energy finance company based in San Francisco, California, that specializes in providing various forms of financing to solar energy enterprises, particularly in emerging markets. Founded in 2012, the company offers short-term working capital, inventory, construction, and structured finance loans to solar product distributors, manufacturers, and project developers primarily in East and West Africa, as well as Asia. SunFunder's mission is to catalyze the development of solar energy infrastructure by leveraging its expertise in the solar market and facilitating efficient due diligence processes. By acting as a financial intermediary, SunFunder enables investors to engage in high-impact, fixed-income debt offerings that support the growth of solar assets in regions with inadequate energy access.
Avogy, Inc. is a company based in San Jose, California, founded in 2010, that specializes in the design, development, and manufacturing of vertical gallium nitride (GaN) based power semiconductor devices. The company produces diodes, JFETs, and vertical GaN transistors, which are essential for improving the efficiency and reliability of power conversion systems. Avogy's innovative products enable system manufacturers to significantly reduce power consumption, size, weight, and costs of various applications, including data center servers, switches, routers, solar and wind inverters, and electric and hybrid vehicles. By focusing on GaN on GaN technology, Avogy aims to enhance the performance and reliability of power electronics, thereby supporting advancements in electrical characterization, reliability testing, and product development for its clients.
Caelux
Venture Round in 2014
Caelux is a renewable energy company based in Pasadena, California, founded in 2014. It specializes in developing and manufacturing perovskite-on-glass technology for the terrestrial solar and commercial space industries. This innovative technology is designed to enhance solar device efficiency while minimizing the amount of semiconducting material required, thereby reducing production costs. Caelux's products improve power production and integrate seamlessly into existing photovoltaic module manufacturing processes, allowing users to lower installed costs and boost overall performance.
LanzaTech
Series C in 2013
Founded in 2005, LanzaTech is a pioneering carbon recycling company that converts industrial waste gases into fuel ethanol and other valuable products. Its innovative bio-catalytic toolkits enable gas fermentation microbes to recycle carbon emissions from sources like steel mills and landfills, reducing reliance on fossil fuels and supporting a circular economy.
KiOR, Inc. is a renewable fuels company that specializes in the production of cellulosic gasoline and diesel derived from lignocellulosic biomass. Utilizing its proprietary biomass-to-cellulosic fuel technology platform, the company aims to provide sustainable fuel alternatives to refiners, terminal and rack owners, as well as fleet operators. Founded in 2007 and headquartered in Pasadena, Texas, KiOR is committed to addressing the growing demand for renewable energy solutions in the transportation sector.
Stion
Private Equity Round in 2012
Stion Corporation is a manufacturer of thin-film solar modules, established in 2006 and headquartered in San Jose, California, with a manufacturing facility in Hattiesburg, Mississippi. The company specializes in developing high-efficiency solar modules that offer reduced material and processing costs, enhancing their power output and reliability. Stion’s products are designed for a variety of applications, including residential, commercial, utility, and off-grid uses. The company markets its solar modules through a network of authorized dealers both in the United States and internationally. By utilizing innovative cell architecture and all-weather construction, Stion aims to lower the overall costs of electricity and improve the efficiency of solar power generation.
KiOR, Inc. is a renewable fuels company that specializes in the production of cellulosic gasoline and diesel derived from lignocellulosic biomass. Utilizing its proprietary biomass-to-cellulosic fuel technology platform, the company aims to provide sustainable fuel alternatives to refiners, terminal and rack owners, as well as fleet operators. Founded in 2007 and headquartered in Pasadena, Texas, KiOR is committed to addressing the growing demand for renewable energy solutions in the transportation sector.
Stion
Private Equity Round in 2011
Stion Corporation is a manufacturer of thin-film solar modules, established in 2006 and headquartered in San Jose, California, with a manufacturing facility in Hattiesburg, Mississippi. The company specializes in developing high-efficiency solar modules that offer reduced material and processing costs, enhancing their power output and reliability. Stion’s products are designed for a variety of applications, including residential, commercial, utility, and off-grid uses. The company markets its solar modules through a network of authorized dealers both in the United States and internationally. By utilizing innovative cell architecture and all-weather construction, Stion aims to lower the overall costs of electricity and improve the efficiency of solar power generation.
Danotek Motion Technologies
Series B in 2011
Danotek Motion Technologies Inc, founded in 2001, in Ann Arbor, Michigan is an ISO 9001:2000 certified technology innovator. Danotek develops clean, energy efficient, generators, electrical conversion systems, brushless motors and electronics controls for alternative energy and advanced transportation applications.
Danotek has developed a number of patent-pending innovative products that include variable speed permanent magnet (PM) generators and brushless motors with integrated electronics for wind power, fuel cell, CHP, auxiliary power and electric and hybrid electric vehicles. Their designs represent industry leadership and are expected to replace inefficient and unreliable systems with added extensive control features.
Ciris Energy
Series B in 2011
Ciris Energy, Inc. is a technology company founded in 2007 and based in Centennial, Colorado. It specializes in the development of proprietary technologies aimed at producing electricity from buried coal and other hydrocarbon deposits. The company focuses on biologically converting coal to methane in large-scale quantities, striving to create a more environmentally responsible and economically efficient method of producing natural gas from coal. Through its innovative approaches, Ciris Energy seeks to enable clients to access coal as a renewable form of energy.
Matrix Industries
Seed Round in 2011
Matrix Industries, Inc. is a technology company based in Menlo Park, California, specializing in the manufacture of thermoelectric products designed for energy harvesting. Founded in 2011, the company is best known for its MATRIX PowerWatch, a smartwatch that harnesses body heat to power its functions, eliminating the need for traditional charging. The watch not only tracks calories burned and activity levels but also monitors sleep patterns. In addition to the smartwatch, Matrix Industries offers various energy harvesting components, including boost converters and thermoelectric energy harvesters, which are distributed through a network of distributors. The company was previously known as Silicium Energy, Inc.
LS9, known as the Renewable Petroleum Company, is a privately-held industrial biotechnology firm based in South San Francisco, California. The company focuses on the development and production of patent-pending UltraClean fuels and sustainable chemicals utilizing synthetic biology. By harnessing advanced industrial synthetic biology techniques, LS9 aims to create renewable petroleum biofuels that serve as eco-friendly alternatives to traditional fossil fuels.
EchoFirst
Series B in 2010
EchoFirst is a manufacturer specializing in integrated solar energy systems designed to meet the electric and heating needs of residential properties. Its innovative Echo solar systems surpass the energy output of traditional photovoltaic systems by generating electricity along with hot water for household uses such as washing and bathing, as well as providing thermal energy for home heating and cooling. The company serves a diverse clientele, including homeowners, installation partners, and developers of new homes, aiming to enhance energy efficiency and sustainability in residential environments.
Kior
Private Equity Round in 2010
KiOR, Inc. is a renewable fuels company that specializes in the production of cellulosic gasoline and diesel derived from lignocellulosic biomass. Utilizing its proprietary biomass-to-cellulosic fuel technology platform, the company aims to provide sustainable fuel alternatives to refiners, terminal and rack owners, as well as fleet operators. Founded in 2007 and headquartered in Pasadena, Texas, KiOR is committed to addressing the growing demand for renewable energy solutions in the transportation sector.
LanzaTech
Series B in 2010
Founded in 2005, LanzaTech is a pioneering carbon recycling company that converts industrial waste gases into fuel ethanol and other valuable products. Its innovative bio-catalytic toolkits enable gas fermentation microbes to recycle carbon emissions from sources like steel mills and landfills, reducing reliance on fossil fuels and supporting a circular economy.
Stion Corporation is a manufacturer of thin-film solar modules, established in 2006 and headquartered in San Jose, California, with a manufacturing facility in Hattiesburg, Mississippi. The company specializes in developing high-efficiency solar modules that offer reduced material and processing costs, enhancing their power output and reliability. Stion’s products are designed for a variety of applications, including residential, commercial, utility, and off-grid uses. The company markets its solar modules through a network of authorized dealers both in the United States and internationally. By utilizing innovative cell architecture and all-weather construction, Stion aims to lower the overall costs of electricity and improve the efficiency of solar power generation.
Nordic Windpower
Series C in 2010
Nordic’s N1000, a simple, light-weight 1MW wind turbine is known for its unsurpassed ease of installation and maintenance, exceptional reliability, and low cost of energy generation.
Nordic Windpower is a technology developer and manufacturer of innovative, two-bladed wind turbines for the rapidly expanding global wind market.
Mainspring
Seed Round in 2010
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.
Danotek Motion Technologies
Venture Round in 2009
Danotek Motion Technologies Inc, founded in 2001, in Ann Arbor, Michigan is an ISO 9001:2000 certified technology innovator. Danotek develops clean, energy efficient, generators, electrical conversion systems, brushless motors and electronics controls for alternative energy and advanced transportation applications.
Danotek has developed a number of patent-pending innovative products that include variable speed permanent magnet (PM) generators and brushless motors with integrated electronics for wind power, fuel cell, CHP, auxiliary power and electric and hybrid electric vehicles. Their designs represent industry leadership and are expected to replace inefficient and unreliable systems with added extensive control features.
LS9, known as the Renewable Petroleum Company, is a privately-held industrial biotechnology firm based in South San Francisco, California. The company focuses on the development and production of patent-pending UltraClean fuels and sustainable chemicals utilizing synthetic biology. By harnessing advanced industrial synthetic biology techniques, LS9 aims to create renewable petroleum biofuels that serve as eco-friendly alternatives to traditional fossil fuels.
SeaMicro
Venture Round in 2009
SeaMicro is a company focused on developing innovative low-power data center solutions aimed at addressing the escalating energy consumption of traditional servers. With the power demands of servers having more than doubled over the past six years, SeaMicro has engineered a new server architecture that utilizes advanced CPU design, virtualization, supercomputing, and networking technologies. Their compact servers consume only one-quarter of the power and occupy one-sixth of the space of conventional servers, making them an efficient alternative for scale-out infrastructures. Furthermore, SeaMicro's servers are designed to be plug-and-play, ensuring compatibility without the need for modifications to existing software operating systems, applications, or management systems. This approach positions SeaMicro as a leader in transforming the data center landscape into a more sustainable and efficient environment.
Ausra
Venture Round in 2009
Ausra is a manufacturer and developer of utility-scale solar technologies aimed at addressing global electricity demands in an environmentally responsible manner. The company specializes in solar thermal power infrastructure, particularly through its compact linear Fresnel reflector systems, which utilize focused sunlight to boil water and generate high-pressure steam that powers conventional turbine generators. Ausra is also advancing low-cost thermal energy storage systems, enabling the generation of solar electric power on demand, both during daylight and nighttime hours. By providing zero-carbon power plants, Ausra offers a viable alternative to fossil-fuel-based electricity generation, delivering energy at competitive market prices while minimizing emissions associated with traditional fuel combustion.
Calera Corporation is focused on carbon sequestration, aiming to combat global warming and ocean acidification by capturing greenhouse gases, particularly carbon dioxide, from the atmosphere. Established in 2007 and headquartered in Los Gatos, California, the company works to reduce atmospheric carbon levels through innovative technologies. Calera has formed a strategic alliance with Bechtel Power Corporation to enhance its efforts in this domain.
Ausra is a manufacturer and developer of utility-scale solar technologies aimed at addressing global electricity demands in an environmentally responsible manner. The company specializes in solar thermal power infrastructure, particularly through its compact linear Fresnel reflector systems, which utilize focused sunlight to boil water and generate high-pressure steam that powers conventional turbine generators. Ausra is also advancing low-cost thermal energy storage systems, enabling the generation of solar electric power on demand, both during daylight and nighttime hours. By providing zero-carbon power plants, Ausra offers a viable alternative to fossil-fuel-based electricity generation, delivering energy at competitive market prices while minimizing emissions associated with traditional fuel combustion.
AltaRock Energy, Inc., established in 2007, is a geothermal energy technology and services company. Headquartered in Seattle, Washington, with additional offices in Sausalito, California, AltaRock specializes in the development and commercialization of geothermal technology to produce clean, renewable power. The company offers a range of services, including project development, management, operations, performance improvement, and reservoir maintenance for both new and existing geothermal projects. AltaRock is also involved in greenfield enhanced geothermal systems projects and commercial stimulation services, aiming to expand the capacity of existing geothermal resources and increase profitability. The company's leadership includes Don O'Shei, Chief Executive Officer, and Susan Petty, President and Chief Technology Officer.
KiOR, Inc. is a renewable fuels company that specializes in the production of cellulosic gasoline and diesel derived from lignocellulosic biomass. Utilizing its proprietary biomass-to-cellulosic fuel technology platform, the company aims to provide sustainable fuel alternatives to refiners, terminal and rack owners, as well as fleet operators. Founded in 2007 and headquartered in Pasadena, Texas, KiOR is committed to addressing the growing demand for renewable energy solutions in the transportation sector.
Firefly International Energy
Series C in 2008
Firefly International Energy is a developer and manufacturer of advanced lead-acid battery technologies, focusing primarily on carbon and graphite foam-based solutions. Launched as a spin-out from Caterpillar in May 2003, the company targets military and commercial industries with its innovative microcell foam-based battery technology. Firefly International Energy aims to enhance the performance and efficiency of lead-acid batteries, positioning itself as a key player in the energy storage sector.
Mascoma develops a consolidated bioprocessing platform to convert non-food biomass such as wood and switchgrass into cellulosic ethanol and biochemicals. It provides engineered microorganisms and proprietary CBP technology that combine enzyme production, hydrolysis, and fermentation into a single, streamlined workflow, enabling renewable fuel producers and industrial bioprocessors to access low-carbon ethanol and value-added biochemicals. The approach aims to simplify production, reduce costs, and accelerate scalable, sustainable alternatives to gasoline.
Infinia Corporation is a solar energy technology company that specializes in the development of innovative power generation systems. The company's flagship product, the PowerDish, is a proprietary solar power generation device that efficiently converts solar energy into electricity. Infinia also provides micro combined heat and power systems targeted at residential energy consumers, as well as solar and biomass-powered electric generators designed for various applications, including deep space missions and remote power needs. The PowerDish is aimed at energy asset developers, utilities, and commercial companies involved in large-scale solar projects, with a global launch anticipated to have begun in late 2010.
PAX Streamline
Series A in 2008
PAX Streamline is a cleantech group that works on reducing the amount of energy waste during the mechanical and productive processes. They a product development firm that designs and markets efficient industrial equipment.
Nanostellar
Series E in 2008
Nanostellar, Inc. develops precious-metals containing materials for the automotive and stationary power industries, enabling these industries to meet stringent diesel emissions-control requirements mandated in Europe, the U.S. and Asia.
The company delivers nano-engineered catalyst materials that reduce exhaust emissions and increase effectiveness of precious metals in these catalysts by 25%-30%. Nanostellar's Rational Catalyst Design methodology combines computation materials science, novel synthesis and chemical engineering to aid in the rapid development of new materials.
Ausra
Debt Financing in 2008
Ausra is a manufacturer and developer of utility-scale solar technologies aimed at addressing global electricity demands in an environmentally responsible manner. The company specializes in solar thermal power infrastructure, particularly through its compact linear Fresnel reflector systems, which utilize focused sunlight to boil water and generate high-pressure steam that powers conventional turbine generators. Ausra is also advancing low-cost thermal energy storage systems, enabling the generation of solar electric power on demand, both during daylight and nighttime hours. By providing zero-carbon power plants, Ausra offers a viable alternative to fossil-fuel-based electricity generation, delivering energy at competitive market prices while minimizing emissions associated with traditional fuel combustion.
Infinia Corporation is a solar energy technology company that specializes in the development of innovative power generation systems. The company's flagship product, the PowerDish, is a proprietary solar power generation device that efficiently converts solar energy into electricity. Infinia also provides micro combined heat and power systems targeted at residential energy consumers, as well as solar and biomass-powered electric generators designed for various applications, including deep space missions and remote power needs. The PowerDish is aimed at energy asset developers, utilities, and commercial companies involved in large-scale solar projects, with a global launch anticipated to have begun in late 2010.
Topanga Technologies
Venture Round in 2008
Topanga Asia specializes in the development of advanced plasma lighting technology, offering energy-efficient and reliable lighting solutions for industrial and commercial applications. The company has created innovative solid-state driven lighting products that utilize an electrode-free high-intensity discharge (HID) bulb. These products are designed to replace traditional lighting sources such as metal halide, high-pressure sodium, halogen, induction, and LED lights, achieving superior lumen output per watt. By focusing on efficiency and low maintenance, Topanga Asia enables businesses to significantly reduce their lighting and energy costs while enhancing overall illumination in outdoor and commercial environments.
KiOR, Inc. is a renewable fuels company that specializes in the production of cellulosic gasoline and diesel derived from lignocellulosic biomass. Utilizing its proprietary biomass-to-cellulosic fuel technology platform, the company aims to provide sustainable fuel alternatives to refiners, terminal and rack owners, as well as fleet operators. Founded in 2007 and headquartered in Pasadena, Texas, KiOR is committed to addressing the growing demand for renewable energy solutions in the transportation sector.
LS9, known as the Renewable Petroleum Company, is a privately-held industrial biotechnology firm based in South San Francisco, California. The company focuses on the development and production of patent-pending UltraClean fuels and sustainable chemicals utilizing synthetic biology. By harnessing advanced industrial synthetic biology techniques, LS9 aims to create renewable petroleum biofuels that serve as eco-friendly alternatives to traditional fossil fuels.
Ausra is a manufacturer and developer of utility-scale solar technologies aimed at addressing global electricity demands in an environmentally responsible manner. The company specializes in solar thermal power infrastructure, particularly through its compact linear Fresnel reflector systems, which utilize focused sunlight to boil water and generate high-pressure steam that powers conventional turbine generators. Ausra is also advancing low-cost thermal energy storage systems, enabling the generation of solar electric power on demand, both during daylight and nighttime hours. By providing zero-carbon power plants, Ausra offers a viable alternative to fossil-fuel-based electricity generation, delivering energy at competitive market prices while minimizing emissions associated with traditional fuel combustion.
AltaRock Energy, Inc., established in 2007, is a geothermal energy technology and services company. Headquartered in Seattle, Washington, with additional offices in Sausalito, California, AltaRock specializes in the development and commercialization of geothermal technology to produce clean, renewable power. The company offers a range of services, including project development, management, operations, performance improvement, and reservoir maintenance for both new and existing geothermal projects. AltaRock is also involved in greenfield enhanced geothermal systems projects and commercial stimulation services, aiming to expand the capacity of existing geothermal resources and increase profitability. The company's leadership includes Don O'Shei, Chief Executive Officer, and Susan Petty, President and Chief Technology Officer.
Stion Corporation is a manufacturer of thin-film solar modules, established in 2006 and headquartered in San Jose, California, with a manufacturing facility in Hattiesburg, Mississippi. The company specializes in developing high-efficiency solar modules that offer reduced material and processing costs, enhancing their power output and reliability. Stion’s products are designed for a variety of applications, including residential, commercial, utility, and off-grid uses. The company markets its solar modules through a network of authorized dealers both in the United States and internationally. By utilizing innovative cell architecture and all-weather construction, Stion aims to lower the overall costs of electricity and improve the efficiency of solar power generation.
Infinia Corporation is a solar energy technology company that specializes in the development of innovative power generation systems. The company's flagship product, the PowerDish, is a proprietary solar power generation device that efficiently converts solar energy into electricity. Infinia also provides micro combined heat and power systems targeted at residential energy consumers, as well as solar and biomass-powered electric generators designed for various applications, including deep space missions and remote power needs. The PowerDish is aimed at energy asset developers, utilities, and commercial companies involved in large-scale solar projects, with a global launch anticipated to have begun in late 2010.
LanzaTech
Series A in 2007
Founded in 2005, LanzaTech is a pioneering carbon recycling company that converts industrial waste gases into fuel ethanol and other valuable products. Its innovative bio-catalytic toolkits enable gas fermentation microbes to recycle carbon emissions from sources like steel mills and landfills, reducing reliance on fossil fuels and supporting a circular economy.
Brenco
Venture Round in 2007
Brenco is a renewable energy company based in Sao Paulo, Brazil, specializing in the production of ethanol and electricity from sugar cane. Founded in 2007, Brenco focuses on developing industrial plants, particularly in greenfield sites located in the midwest region of Brazil. The company's operations contribute to sustainable energy solutions by harnessing the potential of sugar cane as a renewable resource.
LS9, known as the Renewable Petroleum Company, is a privately-held industrial biotechnology firm based in South San Francisco, California. The company focuses on the development and production of patent-pending UltraClean fuels and sustainable chemicals utilizing synthetic biology. By harnessing advanced industrial synthetic biology techniques, LS9 aims to create renewable petroleum biofuels that serve as eco-friendly alternatives to traditional fossil fuels.
Mascoma develops a consolidated bioprocessing platform to convert non-food biomass such as wood and switchgrass into cellulosic ethanol and biochemicals. It provides engineered microorganisms and proprietary CBP technology that combine enzyme production, hydrolysis, and fermentation into a single, streamlined workflow, enabling renewable fuel producers and industrial bioprocessors to access low-carbon ethanol and value-added biochemicals. The approach aims to simplify production, reduce costs, and accelerate scalable, sustainable alternatives to gasoline.
Mascoma develops a consolidated bioprocessing platform to convert non-food biomass such as wood and switchgrass into cellulosic ethanol and biochemicals. It provides engineered microorganisms and proprietary CBP technology that combine enzyme production, hydrolysis, and fermentation into a single, streamlined workflow, enabling renewable fuel producers and industrial bioprocessors to access low-carbon ethanol and value-added biochemicals. The approach aims to simplify production, reduce costs, and accelerate scalable, sustainable alternatives to gasoline.
GreatPoint Energy
Series B in 2006
GreatPoint Energy, Inc. is a technology-focused company that specializes in producing pure hydrogen and substitute natural gas using its proprietary catalytic hydromethanation process. This innovative technology converts carbon-rich feedstocks, including coal, petroleum coke, and biomass, into a methane-rich gas stream, facilitating the creation of low-cost, clean gas suitable for various applications. The company's products serve residential and commercial heating, power generation, industrial processes, and chemical production, while also enabling near-zero carbon electricity generation. In addition to its primary outputs, GreatPoint Energy's process yields valuable by-products such as vanadium, nickel, activated carbon, ammonia, and sulfuric acid. Founded in 2004 and headquartered in Cambridge, Massachusetts, the company caters to clients in several countries, including China, South Korea, Japan, Taiwan, and Indonesia, while collaborating with strategic partners such as AES Corp, Dow Chemical, Peabody Energy, and Suncor Energy.
Stion Corporation is a manufacturer of thin-film solar modules, established in 2006 and headquartered in San Jose, California, with a manufacturing facility in Hattiesburg, Mississippi. The company specializes in developing high-efficiency solar modules that offer reduced material and processing costs, enhancing their power output and reliability. Stion’s products are designed for a variety of applications, including residential, commercial, utility, and off-grid uses. The company markets its solar modules through a network of authorized dealers both in the United States and internationally. By utilizing innovative cell architecture and all-weather construction, Stion aims to lower the overall costs of electricity and improve the efficiency of solar power generation.
Nanostellar
Series A in 2004
Nanostellar, Inc. develops precious-metals containing materials for the automotive and stationary power industries, enabling these industries to meet stringent diesel emissions-control requirements mandated in Europe, the U.S. and Asia.
The company delivers nano-engineered catalyst materials that reduce exhaust emissions and increase effectiveness of precious metals in these catalysts by 25%-30%. Nanostellar's Rational Catalyst Design methodology combines computation materials science, novel synthesis and chemical engineering to aid in the rapid development of new materials.
Realta Fusion develops fusion energy technology for industrial heat and power production. It combines advancements in superconducting materials, plasma physics, and computing power in a simple linear fusion reactor design, utilizing abundant fuel sources to generate zero-carbon heat and power.