Continuity of supply is characterized by the number and duration of interruptions. Several indicators are used to evaluate the continuity of supply in transmission and distribution networks. The most widely used reliability indices are SAIFI, SAIDI, CAIDI, ENS and CENS (IEEE std. 1366-2000 and CIGRE study committee (C2). Regulation can aim to compensate customers for long supply interruptions, keep restoration time under control, and create incentives to reduce the total number and duration of interruptions. The paper presents and assessments the key performance indices for electric distribution system in Egypt, monitored, calculated and analysed by EGYPTERA to concentrate on the guideline values for distribution system, and to provide an optimal level of customer service.