This paper aims to study the operational consequences of the integration of a large number of plug-in electric vehicles in a renewable-dominated power system. The coordination between the power system operator and the charging process of plug-in electric vehicles under a smart-grid environment is modeled using several approaches. The operation of the power system is modeled by means of a network-constrained stochastic economic dispatch. This problem is formulated using a two-stage stochastic programming model in which the uncertainties associated with the charging process of plug-in electric vehicles and with the availability of the renewable sources are characterized as stochastic processes. Numerical results on a realistic case based on the Iberian Peninsula power system are provided and analyzed. (C) 2015 Elsevier Ltd. All rights reserved.