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A new methodology evaluates the reliability of distribution systems considering the impact of failures from the generation and transmission (G&T) systems is presented. An integrated adequacy evaluation, including generation, transmission and distribution, is performed to provide detailed information on the interruptions experienced by consumers. G&T systems are represented by a fictitious equivalent network whose parameters are obtained by Monte Carlo nonsequential. simulation. The equivalent G&T network is then connected with the distribution network and analysed using minimal cut-set theory. Traditional distribution indices (e.g. SAIFI, SAIDI, etc.) as well as the loss-of-load cost indices are disaggregated to measure the contribution of G&T and distribution systems on the overall system indices. The method is applied to a hybrid system created from two standard test systems. The results and their potential applications in the new power system competitive environment are discussed.