Inexpensive charging when there is a high supply, feeding back when there is a shortage in the grid: the VW energy service provider Elli and the Belgian grid operator Elia want to make the use of electric cars as electricity storage systems marketable. On Friday both sides concluded an agreement with the aim of establishing e-vehicles as an integral part of the energy network in the medium term. Elia also brings in the start-up realto, as VW announced. The proportion of renewable energies is to be expanded further. However, wind and solar power often fluctuate, so that phases of peak and underutilization can occur in the grid. To compensate, the possible contribution of electric car batteries has been discussed for some time.