A lot of wind, a lot of watts. Green energy sources flow irregularly. When there are storms, enormous amounts of electricity can strain power grids so much that they are in danger of collapsing. And so far the technical capacities have not been able to absorb and store the surplus capacities. In an emergency, that can even mean wind parks will stop operating completely. Here the economic grid of the Leipzig company Deutsche Energieversorgung comes into play. It links households with an energy storage device to create a decentralized electricity depot. Those who belong to this Smart Grid get surplus electricity free of charge and ensure stability in the public network.