Arbor Energy raises $55M Series A to scale clean baseload power
The world is entering a new era of energy intensity. Data centers, EVs, and industry are all accelerating demand for around-the-clock power. Companies shaping the future of AI in particular are driving unprecedented demand, and while renewables like wind and solar are essential, they can’t power operations 24/7. Meanwhile, the global turbine supply can’t keep up. Customers today face lead times of over five years—and that’s after placing a non-refundable deposit.
Arbor is developing a new kind of turbine designed to bypass supply chain bottlenecks and deliver the clean, reliable baseload power this moment demands. Today, we’re proud to share that we’ve raised a $55M Series A, co-led by Lowercarbon Capital and Voyager Ventures, with participation from Gigascale Capital, Marathon Petroleum Corporation, Cantos Ventures, and others.
With this funding, we’ll complete demonstration of our 1 megawatt (MW) technology pilot ATLAS, while we further the design of HALCYON, our commercial 25 MW supercritical CO₂ (sCO₂) power system. The first HALCYON turbine is on track to come online by 2028. And by 2030, we aim to manufacture gigawatts’ worth of turbines in support of projects around the world.
A new kind of turbine
HALCYON combines advancements in oxy-combustion, which enables emission-free power, with sCO₂, which boosts efficiency while decreasing footprint and cost. It’s the world’s first productized sCO₂ power system, and avoids critical supply chain constraints through the use of 3D-printing for core components. The modular systems can be stacked from 25 MW to over 1 GW, delivering reliable, clean power to utilities, hyperscalers, and industrial operations.
HALCYON systems are:
Fast to build and deploy, leveraging additive manufacturing and pre-assembled process skids
Modular and scalable, enabling redundancy and phased deployment from megawatts to gigawatts
Fuel-flexible, able to run on a variety of fuels from natural gas to biomass
Investors see a clear opportunity to meet surging demand with a more flexible, deployable approach. “The AI revolution demands unprecedented amounts of clean, reliable power, and Arbor delivers exactly that,” said Sarah Sclarsic, Founding and Managing Partner at Voyager Ventures. “Arbor’s modular gas turbines provide the baseload capacity that data centers need, with the speed and flexibility that traditional infrastructure simply can’t match. And best of all, they’re made in America, low-cost, and are the first zero-emission combustion turbines on the market.”
“We have a massive opportunity to deliver abundant, clean, and reliable power that keeps pace with today’s industries,” said Brad Hartwig, Arbor’s CEO and co-founder. “This funding lets us move quickly from tech pilot to commercial deployment and shows how modular, zero-emission turbines like HALCYON can solve the greatest energy challenges faced by businesses today.”
Flexibility that meets the moment
Critically, this system offers one engine with many pathways to clean energy. Natural gas demand is rising as the default option for firming grids and powering large-scale data centers. Arbor’s system is uniquely able to meet that demand without increasing emissions.
When leveraging biomass as a fuel, the system can even deliver carbon-negative power, enabling durable carbon removal at scale. We’ve already demonstrated supercritical oxy-combustion of syngas, and are developing a novel gasification system in-house that will allow HALCYON to run on waste biomass.
Powering a balanced planet
We founded Arbor to address one of the defining challenges of our time: resolving today’s energy crisis while ensuring a truly sustainable civilization. The dual challenge of power and planet is only growing more complex, which is why HALCYON is being engineered for speed, flexibility, and long-term impact. It gives hyperscalers, utilities, and industry leaders a new tool to meet growing business needs without compounding the crisis.
What we build now will shape the world we hand forward. At Arbor, we believe the systems we leave behind should be resilient, responsible, and ready for what’s next.