It can, but that would lead to wasted energy when demand is pushed below supply (when there is no way to store the supply). That sort of defeats the benefit of

It can, but that would lead to wasted energy when demand is pushed below supply (when there is no way to store the supply). That sort of defeats the benefit of elasticity in the demand that was the premise. The idea was that when there is a lot of power being generated on a sunny and windy day, everyone should charge all batteries, heat their water a few extra degrees, run heating or air conditioning a bit harder, etc, as an hour later, the sun could go down, the wind stop blowing and power generation could be scarce. On the other hand elastic supply sources with a fuel cost (hydro, fossil fuels and to some extent nuclear) are much more suited for cases where consumption elasticity is linked to limitations of the distribution systems.