The transition from internal combustion engine (ICE) vehicles to electric vehicles (EV) is currently a major trend worldwide. This revolutionary change in the transport sector could give impacts to the other sectors, including the power sector. Under some circumstances, the EV development could bring some benefits to the electricity grid. The aim of this study is to investigate the impacts of the additional demand from the EV charging to the Java-Bali system, which is projected to have an oversupply situation in 2025. Two scenarios were developed and simulated: with and without EV demand. The results suggest that the addition of EV helps moderating the effects of oversupply in three aspects: improvement in the thermal asset utilization rates, lower system cost, and reduction in CO2 emission intensity.