i'd like to emphasize on this. Our energy grid was so far demand driven. The conventional power plants adjusted their output to the demand.

Continueing on this path with renewables is only possible using extraordinarily many storage systems, which are very very expensive.

If we eevelop systems that flexibilise the energy demand, based on when suplly is available, we can reduce the needed storage capacity. This is already done for systems such as warehouse cooling and generally industrial applications will be vital. Still there is large potential within households too. Refrigeration, water heating, laundry and dishwashers all can provide a valuable flexibilisation of energy demand.

With private households its more tricky though, as you need to avoid all appliances in every household to jump at the cheap energy, creating a demand peak exceeding the supply.