Denmark-based biotech start-up Again is using gas fermentation technology to convert industrial carbon dioxide (CO2) emissions into chemicals and fertilisers, aiming to enhance industrial resilience and reduce carbon emissions in chemical supply chains.
Speaking at gasworld’s European CO2 Summit 2025 in Rotterdam, the Netherlands, Harshvardhan Khotia from Again explained the company’s three-stage gas fermentation process, which utilises specialised bacteria to transform CO2 emissions into commercially useful products.
The start-up is moving towards commercial-scale deployment. Following over 10,000 operational hours at its pilot plant near Copenhagen, Denmark, Again is building its first full-scale facility, TXS-1, in partnership with Finnish energy group Helen and an undisclosed chemical company. The facility will produce glacial acetic acid, commonly used in paints, lacquers, and varnishes, as well as ammonium sulphate fertiliser.
“We have signed an off-take agreement with Helen for all the acetic acid produced,” Khotia said, adding that the 10-year deal provides off-take certainty for up to 50,000 tonnes of acetic acid production annually, supporting Again’s commercial rollout.
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