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§ Private Profile · Los Angeles, CA, USA
Climate technology company developing modular power plants for baseload clean electricity and carbon capture for industries.
Based in El Segundo, California, Arbor Energy develops modular supercritical carbon dioxide turbine systems that generate clean baseload electricity from organic waste while permanently capturing and storing emissions. The company utilizes bioenergy with carbon capture and storage technology to build scalable power plants, including a 1-megawatt pilot facility and a planned 25-megawatt commercial system. The venture-backed firm recently raised a $55 million Series A funding round to scale operations, drawing investment from prominent venture capital firms such as Lowercarbon Capital and Toyota Ventures. Arbor Energy generates revenue by selling renewable electricity and carbon dioxide removal credits, securing a $41 million agreement with Frontier on behalf of Google and a contract to remove 25,000 tons of carbon for Microsoft. The climate technology company was originally founded in 2021 by entrepreneurs Brad Hartwig and Andres Garcia Clark.
Arbor Energy has raised $62.0M across 3 funding rounds.
Key people at Arbor Energy.
Arbor Energy has raised $62.0M in total across 3 funding rounds.
Arbor Energy has raised $62.0M across 3 funding rounds. Most recently, it raised $55.0M Series A in October 2025.
| Date | Round | Lead Investors | Other Investors | Status |
|---|---|---|---|---|
| Oct 1, 2025 | $55M Series A | Lowercarbon Capital, Sarah Sclarsic | 11.2 Capital, Afore Capital, Countdown Capital, Aniq Kassam, Orca Climate Fund | Announced |
| Mar 1, 2023 | $5M Seed | — | 11.2 Capital, Afore Capital, Countdown Capital, Aniq Kassam, Lowercarbon Capital, Orca Climate Fund | Announced |
| Dec 1, 2021 | $2M Seed | — | 11.2 Capital, Afore Capital, Browder Capital, Countdown Capital, Feenix Ventures, Founders Fund, MAC Venture Capital, Ravelin Capital, SNR, Aaron Peterman | Announced |
Key people at Arbor Energy.
Arbor Energy is a cleantech company developing modular, scalable power stations that generate clean baseload electricity with zero operating emissions using supercritical CO₂ turbine systems powered by advanced oxy-combustion.[1][2] The technology is fuel-flexible, running on natural gas to syngas or organic waste, enabling carbon-negative power by converting waste into energy while sequestering CO₂.[2][4][5] Headquartered in Denver, CO, with 70-120 employees and a $340M valuation post-$55M Series A in October 2025 led by Breakthrough Energy Ventures, Arbor serves sustainability leaders like Microsoft and targets data centers, utilities, and industries needing reliable, low-cost clean power.[3][5] It solves the challenge of dependable 24/7 baseload energy amid rising demand—projected to triple in the U.S. by 2050—while addressing emissions through rapid deployment faster than traditional plants.[1][5]
Founded in 2022 (with some sources noting 2021 activity), Arbor Energy was established by aerospace engineers, including Cofounder and CEO Brad Hartwig, who applied rocket engine and turbomachinery expertise from space propulsion to terrestrial clean energy challenges.[3][5][7] The idea emerged from recognizing Earth's finite resources as a "spaceship," leveraging advanced tech to reverse climate impacts by converting waste into energy and permanently removing CO₂.[4] Early traction included winning the U.S. Department of Energy's Carbon Negative Shot and securing a Microsoft deal for 25,000 tons of CO₂ removal starting 2027, powering 4,000 homes annually, validating their pivot to scalable carbon-negative systems.[5]
(Note: A separate entity, Arbor Energy Holdings Inc., founded around 2021 and focused on a digital energy platform for consumers, appears distinct based on different leadership and solutions; this profile centers on the cleantech power innovator.[6])
Arbor rides the surge in electricity demand from AI data centers and electrification, where tech giants seek 24/7 carbon-free power amid limited options like intermittent renewables.[5] Timing aligns with CleanTech funding boom and policy pushes like DOE's Carbon Negative Shot, as global energy markets hit $1.3T potential.[3][5] Market forces—rising waste emissions from decomposition/wildfires, net-zero mandates—favor its waste-to-power model, influencing the ecosystem by enabling circular economies, rapid decarbonization, and scalable infrastructure for hyperscalers.[4][5]
Arbor plans to hit 100 MW generation by 2030, removing nearly 2M tons CO₂ yearly, fueled by Series A for product acceleration, team scaling, and market expansion.[3][5] Trends like tripling U.S. power needs and corporate carbon goals will propel growth, potentially via more OEM deals and international rollout. Its aerospace roots position it to evolve from niche innovator to baseload leader, redefining clean energy as limitless and planet-positive—echoing its mission to power abundance without costing the planet.[2][5]
Arbor Energy has raised $62.0M in total across 3 funding rounds.
Arbor Energy's investors include Lowercarbon Capital, Sarah Sclarsic, 11.2 Capital, Afore Capital, Countdown Capital, Aniq Kassam, Orca Climate Fund, Browder Capital, Feenix Ventures, Founders Fund, MaC Venture Capital, Ravelin Capital.
