The soaring electricity demand due to Electric Vehicles (EVs) increases the urgency of the evolution from the power grid to the so-called smart grid, to manage demand peaks with minimal infrastructure costs. In this paper, we propose an approach close to Vehicle-to- Grid, where EVs can give back some energy from their batteries during peak times. But we also use EVs as energy transporters, by taking their energy where it is consumed. A typical example is a shopping mall with energy needs, benefiting from customers coming and going to alleviate its grid-based consumption, while EV owners make profits by reselling energy bought at off-peak periods. Based on a simple model for EV mobility, energy storage, and electricity pricing, we quantify the reduction in energy costs for the EV-supported system, and investigate the conditions for this scenario to be viable.