W Platform raises €1M to turn winery CO2 from pollutant to circular resource

W Platform, a cleantech startup based in Bordeaux, has raised €1 million in a Seed round backed by VitiRev Innovation, Demea Sustainable Investment, and Tudigo. The company builds CO2 capture and circular valorisation systems for wine châteaux and breweries. This round extends previous Bordeaux-based funding; W Platform raised €2 million in March 2024 and has been accompanied by the Unitec incubator.

The fermentation CO2 problem

Alcoholic fermentation is, chemically, a CO2 generation machine. A winery processing a million litres of wine a year releases a substantial volume of pure CO2 — a gas that requires no cleaning or concentration, unlike industrial capture streams. It goes into the atmosphere because, historically, the economics of capturing it did not pencil out for a farm-scale operation.

W Platform's system captures that fermentation CO2 and routes it back into on-site use cases: carbonation for sparkling wines and craft beers, inert gas blanketing during bottling and storage, and injection into on-site greenhouses. The captured gas is food-grade without additional processing; the on-site use cases have an immediate economic value that offsets the capture cost.

The Bordeaux origin is not incidental — the Gironde is one of Europe's densest concentrations of wine production, which gives W Platform a dense home market and a set of pilot installations that a more geographically spread company would take years to accumulate. The Bordeaux wine industry also has specific sustainability pressure: certification bodies and export buyers increasingly require measurable carbon accounting from producers.

The circular economy argument

The unit economics are the story. For a winery or brewery, CO2 capture makes sense when the value of on-site CO2 use plus the avoided disposal cost exceeds the annualised cost of the capture system. W Platform's pitch is that this crossover has been reached — and that the €1 million from this round funds the scaling of installations to demonstrate it at more sites.

VitiRev Innovation — a fund focused specifically on viticulture innovation — leads the round, which is a credibility signal in a sector where general-purpose investors do not have the customer relationships to validate the product. Demea Sustainable Investment adds environmental-investment framing; Tudigo's crowdfunding component typically brings both capital and a community of engaged small investors, often drawn from within the relevant industry.

The 18-month test

This is a hardware-in-a-building problem at its core: the product's performance depends on installation, calibration, and the specific fermentation volumes of each client. €1 million is a compact Seed for a hardware deployment company, which means the 18-month test is whether installation economics are proven at enough sites to justify a follow-on round that funds regional and national expansion — and whether the CO2 valorisation cases beyond wineries (craft breweries, cider producers, kombucha manufacturers) materialise as commercial opportunities or remain a theoretical TAM.