Electric Vehicles and Smart Grids

What impact does electromobility have on the energy conversion chain as a whole? How can fluctuating, renewable energy sources like the wind and sun be incorporated into the existing electricity grid in order to achieve the EU’s goal for developing renewables (20 percent by 2020) – while at the same time guaranteeing the reliability and quality of the power supply? How can electric cars be integrated most effectively in power grids? And can they perhaps even help stabilize the grids by acting as a kind of buffer for fluctuating sources of energy like wind and solar generators?