Leszno water utility (WWTP Henrykowo) in Poland is investing in a pilot-scale fermentation unit in order to use sewage from e.g. meat industry for biogas production. They are also evaluating the potential benefits and challenges of utilizing effluents containing heavy metals and other harmful substances from the point of view of sludge utilization for energy production. City of Helsinki team had an opportunity to visit Leszno water utility and Henrykowo waste water treatment plant. Investment is proceeding smoothly, thank you for the hospitality to Leszno water utility personnel!