The generation principle pursued by the energy sector in recent years and decades was demand-driven. This means that a power plant only produces electricity when the customer needs it, i.e. in line with demand. Conversely, renewable sources of energy such as wind and solar power are not available "on tap," as they depend on wind intensity and sunshine duration.

As renewable energy sources constantly increase their share of total electricity generation, the task at hand is to find ways to bring demand more in line with supply. E-mobility is ideally suited to this, because cars are parked most of the time. Once mass produced, electric vehicles could be linked up to the grid and let their batteries be used as distributed power reservoirs. In periods of high electricity generation from renewables such as sunshine, power would be fed into vehicle batteries. There are two ways to use this electricity thereafter-as "fuel" for the car, or as a "reservoir" that feeds it back into the grid if so required to meet demand.