In order to give some estimate of the system cost, according to our preliminary test analysis, using the light UAS described in Section III-A, it is possible to reach an optimal quality-price ratio if three or four small plants are located in the same area, or on the contrary, a unique big plant is inspected in a single day. The described system was targeted for a plant size of around 0.2–1 MW, and some scale effect can be envisaged in terms of logistic costs [26]. However, since the operating cost of such vehicles is very low, when compared with traditional aircrafts or helicopters, the overall system cost can be evaluated by less than 5% of the average annual maintenance cost for the cited plant size, but the potential benefits resulting from the inspection can multiply the value with respect to the initial expenditure for the monitoring system..