ASM Terni owns and operates the local power distribution network throughout the City of Terni, which has a population of 111,750 and covers an area of 211 km². As a Distribution System Operator (DSO), ASM Terni manages a power grid that delivers approximately 400 GWh of electricity annually to 65,000 customers. The grid infrastructure includes 3 primary substations, 60 Medium Voltage lines (10 and 20 kV), 700 secondary substations, 587 km of Medium Voltage (MV) lines, and 1,762 km of Low Voltage (LV) lines, supporting a peak power of 70 MW. The network connects more than 1,350 production plants to the LV and MV networks, with a total installed capacity of 72 MW, of which 200 GWh of the yearly electricity supply comes from Distributed Energy Resources (DER), including 30 GWh from intermittent renewable sources like photovoltaic arrays.