Circularity Fuels

Cover Block

Attribute	Value
Company	Circularity Fuels
Tagline	Building AI-controlled reactors to convert waste carbon into drop-in sustainable aviation fuel and other hydrocarbons.
Headquarters	Menlo Park, CA
Founded	2023
Stage	Pre-Seed
Business Model	B2B
Industry	Cleantech / Climatetech
Technology	Hardware
Geography	North America
Growth Profile	Venture Scale
Founding Team	Solo Founder
Funding Label	Undisclosed

Links

• Website: https://www.circularityfuels.com/
• LinkedIn: https://www.linkedin.com/company/circularity-fuels

The Short Version

Circularity Fuels is developing compact, AI-controlled reactors to convert waste carbon, primarily agricultural biogas, into drop-in sustainable aviation fuel. The company, founded in 2023 by Dr. Stephen Beaton, emerged from DCVC’s entrepreneur-in-residence program and is pursuing a wedge strategy, first selling high-purity methane to lab-grown diamond manufacturers before scaling to the aviation fuel market [TechCrunch, February 2025] [DCVC, retrieved 2026]. Its core technology centers on two modular, electrified reactors, the Ouro bi-reforming reactor and the Aion Fischer-Tropsch synthesis reactor, designed to operate at individual farm scale without expensive pipeline infrastructure [iGrowNews] [American Biogas Council].

Beaton’s background includes prior roles as a scientist at the National Renewable Energy Laboratory and as Lab Chief of the U.S. Air Force Petroleum Office [Pollution Online] [DCVC, retrieved 2026]. The company is venture-backed by a consortium including DCVC, MCJ Collective, and government entities like ARPA-E and the California Energy Commission [PitchBook] [MCJ Newsletter]. Its business model is B2B, targeting airlines, fuel suppliers, and long-haul trucking fleets [Circularity Fuels, retrieved 2024].

Data Accuracy: YELLOW -- Core technology and team details are well-corroborated; specific funding amounts and detailed customer deployments are not publicly confirmed.

The Company in Brief

Circularity Fuels was founded in 2023 by Dr. Stephen Beaton, emerging from DCVC's entrepreneur-in-residence program [Bioenergy International] [DCVC, retrieved 2026]. The company is headquartered in Menlo Park, California, and operates as a private, venture-backed entity focused on developing compact reactors for converting waste carbon into synthetic fuels [Crunchbase] [PitchBook].

Key operational milestones have followed a path of technical validation and strategic market entry. The company first targeted lab-grown diamond manufacturers, recycling their exhaust gases into high-purity methane as an initial revenue wedge [TechCrunch, Feb 2025]. Following this, it demonstrated the conversion of raw dairy biogas into synthesis gas at a farm in California's Central Valley [SAF Investor] [BusinessWire, June 2026]. By mid-2026, the company announced the completion of a world-first, end-to-end pilot converting that same agricultural biogas directly into jet fuel components [BusinessWire, June 2026].

Data Accuracy: YELLOW -- Founding details are consistent across multiple sources, but some early milestones rely on single-source reporting.

What They Have Built

The core bet is a hardware platform designed to shrink the footprint and cost of synthetic fuel production. Circularity Fuels builds compact, electrified reactors that convert waste carbon streams, primarily raw biogas from sources like dairy farms, into drop-in synthetic fuels [Circularity Fuels, retrieved 2024]. The process is modular, combining two proprietary reactor units: the Ouro Reactor™ for biogas reforming into syngas, and the Aion Reactor™ for Fischer-Tropsch synthesis of that syngas into a liquid fuel mixture [Circularity Fuels, retrieved 2024]. The system is designed to operate at individual farm scale, explicitly bypassing the need for pipeline access or expensive biogas cleanup infrastructure [iGrowNews].

The technology's initial commercial application serves a different, high-value niche. According to a TechCrunch report, the company's first customer segment is lab-grown diamond manufacturers [TechCrunch, Feb 2025]. The Ouro reactor is used to recycle exhaust gases from diamond production facilities back into high-purity methane, which is then sold back to the manufacturer for use in chemical vapor deposition [DCVC, retrieved 2026].

Publicly demonstrated progress centers on converting agricultural waste. In a 2026 pilot, the company successfully processed raw biogas from a California dairy farm manure storage facility through its Ouro unit to produce synthesis gas [BusinessWire, June 2026]. The syngas was then converted into jet fuel components using Fischer-Tropsch synthesis [American Biogas Council].

Data Accuracy: YELLOW -- Product claims are well-documented across multiple press releases and company sources. The diamond market wedge is reported by a single major outlet. Specific performance metrics for the AI system are not detailed.

Market Size and Demand

The market for sustainable aviation fuel (SAF) is defined by a structural supply deficit, driven by binding policy mandates and voluntary airline commitments. Demand is anchored by regulatory mandates, such as the U.S. Inflation Reduction Act's SAF tax credits and the European Union's ReFuelEU Aviation blending targets, and voluntary corporate commitments from major airlines and cargo carriers. The International Air Transport Association (IATA) estimates global SAF production must increase from less than 0.1% of total jet fuel demand today to approximately 2% by 2025 [IATA, 2023].

Feedstock availability and cost represent the critical bottleneck. Circularity Fuels' focus on agricultural biogas, specifically from dairy manure, targets a feedstock stream that is both a significant methane emission source and widely distributed. The American Biogas Council estimates the U.S. has over 15,000 new biogas system opportunities, primarily on dairy farms [American Biogas Council].

Metric	Value
Global Jet Fuel Market (2023)	$180B
Advanced Biofuels Market (2023)	$1.2B
Projected Advanced Biofuels Market (2030)	$10B

Data Accuracy: YELLOW -- Market sizing figures are drawn from analogous industry reports (IEA, Precedence Research) and trade association data. The specific TAM for the company's biogas-to-SAF niche is not independently quantified in public sources.

Who Else Is Fighting for This

Company	Positioning	Stage / Funding	Notable Differentiator
Circularity Fuels	Modular, AI-controlled reactors converting raw biogas into drop-in SAF and renewable diesel.	Pre-Seed; backed by DCVC, MCJ Collective, ARPA-E, California Energy Commission.	Targets farm-scale, decentralized production without pipeline infrastructure.
Infinium	Developer of electrofuels (e-fuels) using renewable power, water, and captured CO₂.	Later stage; raised $69M Series B in 2023.	Focuses on large-scale, centralized production facilities.
Greenlyte	Technology for direct air capture (DAC) of CO₂.	Early stage; €10.5M Pre-Series A in 2024.	Positions as a carbon feedstock supplier to fuel synthesis partners.

Data Accuracy: YELLOW -- Competitor profiles and funding stages are drawn from public databases (Crunchbase, Sifted) but lack recent verification for some metrics.

Opportunity

The prize for Circularity Fuels is a foundational role in decarbonizing heavy transport by turning a pervasive waste liability into a high-value, drop-in fuel asset. The company's core technical claim is that its reactors can convert dairy farm waste into jet fuel components at one-hundredth the capital cost of conventional methane reformers [American Biogas Council]. If validated, this cost advantage could enable the deployment of thousands of small-scale units directly at biogas sources like farms and landfills [iGrowNews].

Data Accuracy: YELLOW -- Growth scenarios are logical extrapolations from cited technology claims and market structure.

Sources

1. [TechCrunch, February 2025] Exclusive: E-fuels startup will make diamonds before powering jet planes | https://techcrunch.com/2025/02/04/e-fuels-startup-will-make-diamonds-before-powering-jet-planes/
2. [DCVC, retrieved 2026] | https://www.dcvc.com/
3. [Bioenergy International] Circularity Fuels demo's raw biogas-to-syngas | https://bioenergyinternational.com/circularity-fuels-demos-raw-biogas-to-syngas/
4. [Crunchbase] Circularity Fuels - Crunchbase Company Profile & Funding | https://www.crunchbase.com/organization/circularity-fuels
5. [PitchBook] Circularity Fuels 2026 Company Profile: Valuation, Funding & Investors | https://pitchbook.com/profiles/company/530712-64
6. [Circularity Fuels, retrieved 2024] Circularity Fuels · Fuels and chemicals for the modern era | https://www.circularityfuels.com/
7. [SAF Investor] Circularity Fuels converts dairy farm waste into SAF | https://www.safinvestor.com/news/148426/circularity-fuels/
8. [BusinessWire, June 2026] Circularity Fuels Converts Raw Dairy Biogas to Jet Fuel in World First End-to-End Pilot | https://www.businesswire.com/news/home/20260615483254/en/Circularity-Fuels-Converts-Raw-Dairy-Biogas-to-Jet-Fuel-in-World-First-End-to-End-Pilot
9. [iGrowNews] Circularity Fuels Completes World’s First End-to-End Conversion of Agricultural Biogas into Sustainable Aviation Fuel | https://igrownews.com/circularity-fuels-latest-news/
10. [American Biogas Council] Circularity Fuels Converts Dairy Farm Waste into Jet Fuel Components at One-Hundredth the Capital Cost of Conventional Methane Reformers | https://americanbiogascouncil.org/circularity-fuels-converts-dairy-farm-waste-into-jet-fuel-components-at-one-hundredth-the-capital-cost-of-conventional-methane-reformers/
11. [MCJ Newsletter] MCJ's Investment in Circularity Fuels - MCJ Newsletter | https://newsletter.mcj.vc/p/circularity-fuels-investment
12. [Pollution Online] | https://www.pollutiononline.com/
13. [IATA, 2023] | https://www.iata.org/
14. [IEA, 2024] | https://www.iea.org/
15. [Precedence Research, 2023] | https://www.precedenceresearch.com/
16. [Sifted, 2024] | https://sifted.eu/
17. [Renewable Energy Magazine, June 2026] | https://www.renewableenergymagazine.com/