Currently we're talking about small islands. But why would an industrialized area built enough storage now if we don't have enough supply? Germany for example g

Currently we're talking about small islands. But why would an industrialized area built enough storage now if we don't have enough supply? Germany for example gets about 40-50% of its electricity from renewables (averaged over a year), with hardly any storage. Yet only a few percent of the renewable supply are wasted. We're very far away from getting 50% of our primary energy from renewables, so we could plausibly wait with building storage until that goal is achieved. If we had a proper carbon price, we could let the market figure out when it is most economical to start building storage for multiple days...