Fra essi va ricordato, in primo luogo, il rinnovo automatico e permanente dell'energia utilizzata, i costi di esercizio molto bassi e la lunga durata degli impianti. ###>In those places where the topography was suitable, water power traditionally held pride of place, thanks to a number of indisputable advantages, among which were the continuous natural replenishment of the energy consumed, the very low operating costs and the long operating life of the generating plant.