We present a complete laboratory-scale demonstration of industrial off-gas valorisation that is achieved by integrating enzyme-promoted CO₂ capture and purification, electrochemical conversion and downstream processing. Mixed off-gas was sampled on-site before and after an industrial scrubber, subsequently purified and enriched in methyldiethanolamine (MDEA) using a carbonic anhydrase-enhanced sorption achieving an average CO₂ absorption efficiency of 62.6 ± 2.2% and a desorption efficiency of 81 ± 5%. The 300 L gained gas containing approximately 90% CO₂ was subsequently employed as feedstock for electrochemical CO₂ reduction reaction using tin gas diffusion electrodes (Sn-GDE). After 4 h of operation, 6.9 ± 0.3 L⁻¹ of formate with a coulombic efficiency of 57.8 ± 5.0% was produced in ca. 1.9 L being the combined catholyte solutions of 4 independent replicates. Downstream processing thereof enabled formate extraction and concentration to 189 L⁻¹ formic acid in 10 mL. The overall workflow, from raw off-gas to a purified product, highlights the feasibility of coupling biocatalyst-assisted CO₂ capture with electrochemical conversion for sustainable carbon utilisation. This study provides an important step toward scalable, integrated CO₂ capture and conversion technologies directly applicable to industrial emission sources, by demonstrating the operational challenges that arise only upon process integration.