The possibility of supply disturbances could be detrimental to some customers. Such as in some industries, where these types of disruptions can represent a serious cost. Productivity and competitiveness in manufacturing and service industries increasingly depend on the quality of electricity supply and are also dependent on the good efficiency of continuity indicators. After initially monitoring its indicators in 2001, Portugal introduced a continuity of supply incentive regime in 2003. Since the introduction of the regime, indicators have consistently improved over the years, which pressures a constant improvement of the service related to client satisfaction. Frequency and duration of continuity service indicators are here considered to study the quality of service in Portugal’s mainland in the period of 2014 up to 2022. Here a two–way analysis of variance (ANOVA) was performed aiming to evaluate the existence of differences between two factors: quality service regulation (QSR) zones and municipality code. The results point to the need to seek a more accurate analysis for each of the variables that represent continuity indicators. Even so, it was possible to identify differences in the medium and low voltage indicators regarding the two factors, as well as the existence of differences in the mean values in each factor.

The first author, this work was partially supported by Funda¸c˜ao para a Ciˆencia e a Tecnologia, I.P. (FCT) [ISTAR Projects: UIDB/04466/2020 and UIDP/04466/2020]