The increasing insertion of renewable distributed generation (DG) in electrical distribution systems has been profoundly changing the structure of these networks. The presence of these resources makes the assessment of reliability even more relevant in view of existing regulatory aspects. If, on the one hand, such an impact can contribute positively to the performance of the system, on the other hand, the complexity of the analysis increases dramatically due to the intermittency characteristics of renewable resources. Thus, it is essential to develop an efficient methodology capable of adequately modeling the behavior of the network and its new technologies. This paper evaluates the performance of distribution systems with DG using sequential Monte Carlo simulation, including the failures of these units. For this, a modification of an IEEE standard test system is used, where several tests are performed to certify the accuracy and efficiency of the proposed methodology.