Arbor Energy Raises $55 Million to Deploy Zero-Emission Supercritical CO2 Turbines

Clean power startup Arbor Energy announced a $55 million Series A funding round to accelerate development of its supercritical CO2 turbine technology capable of delivering zero-emission baseload power to energy-intensive industries. The round was co-led by Lowercarbon Capital and Voyager Ventures, with participation from Marathon Petroleum and others.

Founded in 2022 by SpaceX veterans, Arbor has developed a supercritical CO2 turbine using advanced oxy-combustion technology that enables emission-free electricity generation across fuel types from natural gas to syngas and biomass. When operating on biomass, the system delivers carbon-negative power. The company announced $41 million in carbon removal agreements with Frontier, on behalf of companies including Google, Shopify, and H&M Group, earlier in 2025. The new capital will support completion of Arbor's 1 MW ATLAS pilot system and accelerate development of the 25 MW HALCYON commercial power system.

Arbor's HALCYON system combines oxy-combustion — which prevents CO2 release by using pure oxygen rather than air as the oxidant — with supercritical CO2 cycles that enhance thermodynamic efficiency while reducing the physical footprint of the power unit. The technology uses 3D printing to reduce supply chain dependencies and can be deployed in modular units from 25 MW to over 1 GW, enabling scalable deployment for industrial and data center customers. Unlike intermittent renewables, the turbines provide dispatchable baseload power, addressing one of the key gaps in clean energy portfolios for heavy industry.

Arbor expects the first HALCYON turbine to come online by 2028, with plans to manufacture gigawatts of capacity by the end of the decade. The technology is particularly relevant for data centers, energy-intensive manufacturing, and industries requiring continuous power supply that cannot be reliably served by renewables alone. For India, which is navigating both rapid industrial growth and ambitious climate targets, supercritical CO2 power systems compatible with domestic fuel sources could represent a future baseload decarbonization pathway, particularly if the technology achieves the cost competitiveness that Arbor's investors are backing.

Key figure — $41 million in carbon removal agreements with Frontier announced earlier in 2025