Supply quality issues have been addressed, viewed, and reported by the electricity authority in the Kingdom of Saudi Arabia (KSA) and its customers with the common goal of improving the performance of the electricity system and ensuring that the electricity supply service is delivered according to the applicable national regulation and standard and with sufficient reliability and security. This paper presents the results of a recently completed study, in order to address and investigate the supply quality issues in industrial, commercial and residential sectors establishments. The work of the study included tasks to monitor measure and analyze the different supply quality parameters for various sectors, such as, industrial, commercial and residential sectors.