the system has three depots. due madonne depot, in the east; battindarno depot, in the west; and ferrarese depot, in the north. none of them is connected to the trolleybus route network with overhead wires, and trolleybuses use their diesel-powered generators to run to and from the depots. ferrarese depot is relatively new, having opened in 2013 (initially only for motorbuses; for trolleybuses in 2016).