The presented article shows economic aspects of the power delivery systems due to loss of functional continuity. Complex power systems need to maintain their fault-tolerant operational stage. On this purpose intelligent models are used to compute the availability, taking in account the devices dependency (dependability). The intelligent models are meant to take in account the informatics/automation system action, designed to maintain the fault-tolerant stage. An algorithm is built for delivery system steady-state performance computation. The measurable results are presented for a real power delivery case study. Delivery power flow and energy losses are used for the economic study with the economic damage computation. The 20 kV power station was monitored and supervised for 1-year interval.