Reverion raises $175 million Series B for 250 MW fuel-cell factory

Reverion has raised $175 million in Series B funding, most of it earmarked for a production facility that would expand annual manufacturing capacity tenfold to 250 MW. The Bavarian start-up builds reversible solid-oxide systems that run as both electrolysers and fuel cells, turning surplus electricity into hydrogen or other storable gases and then reversing the process to generate power when wind and solar cannot — the firmness problem that has kept fossil-fuel backup on the grid.

At 500 kW a unit, 250 MW a year works out to 500 units, a capacity that has to be set against the seven commercial plants operating in the field. Chief operating officer Felix Fischer frames the raise as a way to clear a backlog and steer the company toward long-term profitability, the economics of equipment manufacturing rather than project development: revenue arrives as units ship to utilities and industrial customers, not when an offtake contract is signed.

The performance claim attached to those units is the manufacturer's own. Reverion says its equipment has reached 74.2% electrical efficiency in generation mode, measured during live customer operation on units from pre-series production; the announcement names no independent verification and does not identify the customers involved. On biomethane the systems can capture high-purity carbon dioxide, the basis for calling the plants potentially carbon-negative, and on hydrogen they operate without producing CO2. A related link on the ESG News page points to $41 million in carbon-removal deals for Reverion, suggesting the carbon stream is sold as a product line in its own right.

Kembara led the round, with Allianz, KfW Capital and Carbon Equity among the new backers, according to our September report. No labeled instrument sits anywhere in the structure — no green bond, no sustainability-linked ratchet — and the capital is being priced against an industrial milestone: tenfold capacity, larger units, a backlog the company describes as international and growing. It is a different underwriting question than a labeled security poses, and a harder one to check early, because efficiency on pre-series units in customer trials does not yet establish what a 500 kW fleet delivers across a year of cycling between electrolysis and generation.

Whether orders arrive at anything like five hundred units a year is what the capital now has to prove.

Transition capital has spent several years moving from wrapper to project economics, and this round shows the direction of travel in its plainest form: an equity check written against manufacturing throughput, with the diligence left to later. The $175 million does not buy a subsidy, an offtake guarantee or a verified label; it buys a building, tooling and the presumption that utilities and industrial operators will pay for firm, carbon-negative power at a rate no current installation has yet demonstrated. The capacity number is the easy part; the 500 units a year it implies are the hard part.