The expansion of the photovoltaic system for the needs of the “Catalyst Wrocław by LemonTree” warehouse and logistics centre, which houses the world’s largest Hilti service shop, includedthe coordination of the detailed design, the necessary formal and legal arrangements, as well as the comprehensive implementation of a roof-mounted PV system with a peak power output of 250 kWp (approx. 220 MWh per year). Power from the panels is entirely used by the Hilti Polska service centre, powering, among others, the compressed air, dust extraction, precision air conditioning and ventilation process systems, as well as the tenant’s domestic systems.