Supported by generous federal incentives and customer acceptance, the number of plug-in electric vehicles (PEVs) is increasing worldwide. A PEV can be charged both at a residential or a commercial facility by connecting it to the power grid using a charging equipment. The power demand for a single PEV charging may exceed the peak power demand of an ordinary household. Hence, an increasing number of PEVs can potentially impact the power grid massively.This paper aims to quantify the impacts of an increasing number of PEVs on power distribution circuits. A comparative analysis of the PEV impacts on the North American and European distribution circuits are presented. The study also identifies the indicators representative for quantifying the grid impacts of PEV charging.The paper further intents to clarify the interface between OEMs and utilities in achieving the common goal of a successful PEV charging and therefore a faster customer acceptance. Conclusions and recommendations are presented for both instances to better understand the interface between PEV and power system.