Australia was an early mass adopter of suburban rooftop solar and a similar issue played out here.<p>It turns out that the cost of building and maintaining the grid is the majority of the cost of electricity to the home. As the cost of actual kWh trends to zero, the cost of the grid becomes the dominant cost.<p>If households with solar want to use the grid effectively as a battery, that has a defined and quite high cost, and has to be paid no matter how you structure it (monthly fee, tax, etc)