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A 6‐ha field at Aberystwyth, UK, was converted in 2012 from semi‐improved grassland to Miscanthus x giganteus for biomass production; results from transition to the end of the first 3 years are presented here. An eddy covariance sensor mast was established from year one with a second mast added from year two, improving coverage and providing replicated measurements of CO₂ exchange between the ecosystem and atmosphere. Using a simple mass balance approach, above‐ground and below‐ground biomass production are combined with partitioned CO₂ fluxes to estimate short‐term carbon deltas across individual years. Years one and two both ended with the site as a net source of carbon following cultivation disturbances, cumulative NEE by the end of year two was 138.57 ± 16.91 g C m⁻². The site became a cumulative net sink for carbon by the end of June in the third growing season and remained so …