Prometheus

Market position

The company operates in the e-fuels / direct air capture segment and has been described in 2021 coverage as the first unicorn in electrofuels. Sources do not provide market share, revenue or comparative benchmarking against other e-fuel producers.

The stated differentiator is a 100% electrochemical, room-temperature synthesis route that avoids the heat-intensive distillation used in conventional processes, which the company argues lowers cost enough for carbon-neutral fuels to compete with commodity fossil fuel prices when powered by low-cost off-grid solar. The founder has acknowledged theoretical system efficiency of only 50-60% but argued that lower energy intensity offsets this on cost. A second claimed differentiator is that the same platform functions as seasonal, months-long energy storage and can run intermittently without grid power.

Technology

The process combines direct air capture of CO2 with electrochemical conversion. Per Wikipedia, a solution of water and CO2 is exposed to an electrified copper plate, catalyzing a reaction that produces fuel alcohols, mostly ethanol. Carbon nanotube membranes — cylindrical nanotubes embedded in plastic — separate ethanol from water, yielding roughly 95% ethanol, which is then catalyzed with zeolite into longer-chain hydrocarbons such as gasoline, diesel or jet fuel. The reaction runs at room temperature, unlike conventional distillation-based separation. The company describes the resulting products as diesel, jet fuel, kerosene, methanol and gasoline, packaged into ULDES systems for seasonal storage and Fuel Forge systems for intermittent, off-grid operation, including containerized units powered by portable small modular reactors.

Go-to-market

The website organizes the offering around three named application segments — data center power, transportation, and defense — and stresses that the platform has "no infrastructure prerequisites," enabling deployment from central grid infrastructure to remote sites. Prior public commercial traction cited on the Y Combinator profile takes the form of a large jet-fuel offtake order from an airline.

Data center and grid operators seeking firm, dispatchable power and seasonal renewable firming; aviation and shipping fuel buyers; and defense customers requiring on-site fuel production in temporary or remote locations. An airline (American Airlines) is named as a jet fuel customer in the Y Combinator profile.

Geography

Headquartered in Santa Cruz, California, USA. No other offices or production sites are identified in the sources.

History

The company was founded by Rob McGinnis and participated in Y Combinator's Winter 2019 batch, having been selected in March 2019 as one of two projects funded under YC's call for carbon-removal companies. Media coverage followed in 2019 from Bloomberg, Science, Chemistry World and Santa Cruz Works. BMW announced a $12.5 million investment in June 2020, and Norwegian investment firm Tjuvholmen Ventures is also listed as an investor. In September 2021 the company announced the close of a Series B and was described in coverage as the first electrofuels unicorn, with Maersk reported as a backer. The most recent item listed on its YC profile dates to August 2025. The current website emphasizes ULDES and Fuel Forge energy-storage systems rather than gasoline alone.

Risks & controversies

Sources contain unverified and promotional claims: the Wikipedia article carries an October 2025 maintenance banner for promotional tone, and several performance and commercial claims (price parity with fossil jet fuel, the 10-million-gallon airline order, unicorn status) originate from the company's own Y Combinator listing rather than independent verification. Founding year is inconsistent across sources (2018 per Y Combinator, 2019 per Wikipedia). The founder himself has noted low theoretical process efficiency of 50-60%. Several public sources also share the Prometheus name with an unrelated AI company, creating identification risk in datasets.