How to maintain the balance between the energy needs in our everyday life and the energy production that is being shaken by variable renewable energy sources and electrification? The energy network must sustain equal amount of energy as is currently needed for living and running businesses. On the other hand, energy being produced to the network must be consumed in total or otherwise the balance is being violated. The transition from centralized energy production to distributed energy system involves all of us and requires new technologies and services as well as new models to run and optimize the system. In the midst of all this, the crucial question then is: how do we store all the electricity we need?