"Collapse" is in the eye of the beholder anyway. There is a minority of peoples and sub-cultures in the United States that Kunstler's version of collapse would have near zero effect upon anyway. And there is a much larger sub-set of the population that collapse would have relatively minor effects upon. The city of Louisville, Kentucky (where I grew up) is a city of just about one million people with it's own 10 Megawatt hydroelectric plant less than a mile from the downtown district. Some sub-cultures and some locales are better suited for the coming "collapse" than others.
Ten megawatts for a million people? Got your candles ready?
Yes, I do; and much more. No, 10 watts per person isn't enough to maintain anything near current standards. It is enough to maintain current standards for 10K+ households, however. Alternatively, it's enough to keep a million cell phones charged and the local infrastructure running. More likely, however; one quarter that number of cell phones and refrigeration for foodstuff is where the dust settles. Communications and hygiene are two high priorities for our society, and there is no form of mass communication more effective than the Internet. People will make special efforts to make sure that their cell phones work and the refrigerator is cold. Which of those two things is more important depends upon the generation of the person you are asking, but there is no doubt that those two are most important. In places where the flow of water requires power input, that would be high on the list of priorities for rationed hydropower as well, but in the long run people simply move out of such areas. In addition to the hydroplant, Louisville also sits right on top of the largest
self-replenishing aquifier in the United States, and it covers more than the county. As I sit here at home, the water table is no more than 26' below the grass, which is why I can't have a basement. I have considered, in the past, buying a driven wellpoint and a hand operated well pump just to keep around should I ever need it, but I have never gotten around to it.
EDIT: My kindle uses a tenth the power that my android cell phone uses, and both can run for a long time with their transceivers off. Did you know that there are apps that permit you to download the most commonly accessed Wikipedia articles in English, and save them to your phone for offline use? And the long term educational and survival value of an e-ink based e-reader cannot be overstated. Literally a one-pound library that can be maintained with a 2.5 watt solar cell, and still not take too much sun time to prevent you from charging your other devices.