The Three Maids Green Plant in Winchester is a state-of-the-art AD facility co-digesting agricultural organic residue and sequentially grown crops. This plant maximises the
energy potential of farm-based waste streams while supporting sustainable nutrientcycles and regional decarbonisation goals.

Out of the 94,000 tonnes per year of feedstock, about 20,000 tonnes per year are straw. Given the straw’s high fibrous content, the plant includes a dedicated mechanical pretreatment designed to optimise digestibility. On the other side, the chicken manure is diluted and fed to the second of three digestion stages. These measures allow to ensure highest operation reliability while maximising biogas production, generating approximately 100 GWh of biomethane.

A defining and distinguishing feature of the Three Maids plants is the implementation of full-stream sanitation step after digestion and previous to dewatering, including a heat recovery step to minimize the heat consumption.