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A computer based method for analysis of electric distribution feeder reliability is developed. The method utilizes component failure rates and feeder configuration in determining values for the reliability measures: Feeder Average Interruption Frequency Index, FAIFI and Feeder Average Interruption Duration Index, FAIDI. The analysis method is applied to the prediction of the reliability of a Pacific Gas and Electric Company feeder. This 21 kV underground feeder, designated Stockdale 2114, was upgraded extensively during 1985. The effect on reliability of each stage of the upgrade program is evaluated and the cumulative effects on the reliability indices are predicted.