Abstract: Identification of the significant few faults in Electric Power Distribution Systems (EPDS) is very crucial in reliability assessment. This study presents the application of Pareto analysis in capturing the faults that, if attended to, will increase the reliability of Electric Power Distribution Systems. Historical power outage data in 2004 were collected from the monopolistic operator of the Nigerian power system, National Electric Power Authority-NEPA (now unbundled and called Power Holding Company of Nigeria, (PHCN) Plc) on the four feeders: Uselu, Ugbowo, Eguadaiken and FGGC Road feeders radiating from the 2�15 MVA transformers, 33/11kV Ugbowo injection substation were collected and analysed using Microsoft Access database. The substation serves about 17537 customers. The Pareto charts were then plotted using the line-column in two-axis of Microsoft Excel spreadsheet. The results obtained showed that attending to load shedding, load shedding and earth faults, load shedding and 33kV line failures, load shedding in the FGGC Road, Ugbowo, Uselu and Eguadaiken feeders will lead to reliability increase from 0.78879-093353, 0.69483-0.91959, 0.78797-0.94413 and 0.75938-0.93032, respectively. It is apparent that the reduction of load shedding as suggested by the analysis implies the need for the increase of Electric power generation in Nigeria to meet demand and system losses. The other faults that are not captured by this analysis will cost more to solve than the derivable benefits.