Problem

Phase Biolabs addresses the industrial problem of CO₂ emissions that are currently treated as a waste stream, cost, or compliance burden rather than as a feedstock. Its proposition is especially relevant to ethanol producers: much of the CO₂ generated by existing plants is vented, while producers face pressure to lower carbon intensity and secure better economics through advanced-biofuel pricing, low-carbon fuel credits, and emerging alcohol-to-jet markets.

The principal use case is retrofitting an existing grain-ethanol plant so its off-gas can be converted into additional ethanol. Phase’s illustrative model shows the potential economics: for a plant emitting 300,000 tonnes of CO₂ annually, the retrofit could produce 45 million additional gallons of ethanol and $42.3 million in modeled new revenue, assuming a $1.75-per-gallon ethanol price and including D5 RINs. These are company-model assumptions rather than demonstrated commercial results.

Product / Service

Phase develops a gas-fermentation platform using proprietary, genetically engineered microbial biocatalysts. Its three-step process prepares the gas, ferments the CO₂ into ethanol, and separates the product. The company says the process uses emissions directly with minimal processing, requires no separate carbon-capture technology, and can be installed as a bolt-on unit without disrupting the customer's existing plant.

The delivery model is a licensable retrofit: Phase licenses the technology and supplies the biocatalyst, while the industrial producer operates the production asset and retains the resulting output and upside. The benefit is a way to turn an emissions stream into more product and revenue while reducing process carbon intensity. Phase is also developing a broader platform for carbon-negative chemicals and e-fuels beyond its initial ethanol application.

Market

Phase competes in carbon capture and utilisation, industrial biotechnology, gas fermentation, low-carbon ethanol, and CO₂-derived fuels and chemicals. Its initial target market is sizeable by industrial standards: Phase says the global ethanol industry includes more than 800 plants, with the majority of their CO₂ currently vented. Relevant competitors and alternative approaches include LanzaTech, which uses gas fermentation to produce ethanol from industrial emissions and reports six commercial facilities, and Twelve, which converts CO₂ into products such as sustainable aviation fuel using renewable electricity.

Phase was founded in 2020, joined Y Combinator’s Winter 2022 batch, and reports support from Breakthrough Energy and Transition. It operates a small pilot plant in Nottingham, uses that facility to collect continuous performance data, and has reported pilot ethanol yields above 80%. It has partnership agreements involving biogenic CO₂ and renewable hydrogen and is seeking partners and a location for a commercial demonstration plant. The evidence therefore indicates a funded, pilot-stage and pre-commercial company rather than one with established commercial revenue or a full-scale operating plant.