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Energy storage is already a reality, and is part of the costs of generation -- i.e. storage costs are also dropping. Crescent Dunes already uses a molten salt energy storage system; there are wind systems as well.
Constant supply has its own issues, as it can be inflexible. E.g. it is not easy to modulate coal or nuclear plans, and constantly changing generation can strain existing equipment, which increases costs, maintenance and risk. I.e. constant sources are not without their own problems.
Exactly, because consumption isn't constant.
We have an interesting system here: A nuclear plant, which has to run constantly, is linked to a hydro plant. When there isn't enough demand for the nuclear energy, it's used to pump the water back uphill so it can be run through the generator again. It works well. It's in effect a huge battery for storing energy.
Oh, and the trout fishing in the two reservoirs is a great fringe benefit.
Such a system could work for solar or wind as well.