It should be noted that under the current system for organizing international electricity trade, a gold mine is exactly what this is - Denmark does exactly what is proposed here already, and while the net trade in kwh sums to near zero, the net trade in kroner favors the storage vendors. A lot.

.. Which actually causes me a good deal of puzzlement. Selling timeshifting is currently a heck of a lot more profitable than selling intermittent electricity is, yet investment in intermittent generation capacity appears to be running ahead of investment in grid and storage quite badly.