the stove and hot water tank? What energy source are you using to power them? How do you supply the energy requirements of apartment buildings, hospitals, schools, factories, shopping centers and other high density areas without a power delivery system?

These Self sufficient houses that you talk about work so long as they maintain an adequate roof or other energy gathering area to occupant ratio and limit the power usage per occupant to a predefined level. This usually involves a significant change in the habits of the occupants.
The actual minimum power needed is dependant on the actual location involved.
For this to work the system must have enough reserve capacity to remain fully functional at the end of the worst cold cloudy period expected.
Given that the goal is energy independence from the grid and freedom from fossil fuels exactly what will your heating source be for those areas that reach sub zero temperatures?
Remember that the occupants probably would like to be able to flush the toilets and shower year round.
I am in favour of reducing energy consumption through any practical means.
I simply do not see how we can eliminate the distribution grid and remain capable of manufacturing these high tech houses appliances and cars then distributing them to the point of use.
I believe that the city as we know it is a dinosaur that must be abandoned in favour of a more energy efficient work / residence / food source relationship that minimizes energy used (wasted?) moving people between those locations.

I also believe that ultimately we must strike a balance between population, available renewable energy and food production.

Electric cars are the future but they are not pollution free they are pollution relocators.
Compare your current electrical bill to your transportation fuel bill then factor in part of your other living expenses to account for the fuel costs included.
When you consider the percentage of our total energy budget going to transportation it becomes obvious that it would be impossible to supply even 75% of it without an enlargement of the delivery grid which is contrary to the intent of reducing or eliminating the grid.
Terry