The voltage continuity and quality are two different aspects of the quality on the electrical supply. Their regulation is of great importance due to the economical consequences associated with the presence of the disturbances in the electrical power systems. While voltage continuity has been regulated in several countries for his undouble importance, the voltage quality has only recently become an important concern for utilities, customers and consulting engineers. Actually, a fervid international debate is underway to find the best economic regulatory mechanism to improve the voltage quality. This paper illustrates some mechanisms of economic voltage quality regulation proposed in the most recent international literature.