Photovoltaic systems (PVSs) and plug-in electric vehicles (PEVs) are becoming increasingly common and expected to be further integrated into electric power distribution systems (EDSs) in the near future. In this paper, the combined effects of PVSs and PEVs on the feeder and transformer loads, voltage profiles and harmonic distortions of an urban area EDS are investigated. The results indicate that the simultaneous connection of PVSs and PEVs, at the correct ratio, can impact load reduction and produce a reduction in voltage variations while potentially resulting in an increase the total harmonic distortion of voltage (THDV). In addition, this paper presents changes in the characteristic daily load and voltage profiles and changes in the THDV of the system caused by the simultaneous operation of PVSs and PEVs. The test EDS with 19 nodes is based on a real EDS. Two seasons, summer and winter, and several different degrees of penetration of PVSs and PEVs were studied. We used a stochastic approach to model the loads, PVSs and PEVs based on data measured in real systems and data found in the literature. (C) 2014 Elsevier Ltd. All rights reserved.