There's something else that I dislike in most people's PSHTF plans - most people plan to take an active approach to protecting what's theirs.
For the most part, that means being really obvious about announcing their presence. Generators running...
Like it or not, if you aren't sitting on top of an oil field, or have made massive investments in a geothermal power system, you're going to have limits to power. Or, rather, be very obvious that you have an energy harvesting system - especially if you want power. And, you might have to spend a lot of time gathering fuel if you want a lot of power.... If have to spend time gathering fuel, the less time you have to deal with everything else that comes along.... And you'd better home you're living next to a national park or tree plantation.... And THEN, you should really keep track of how much wood is growing, versus how much you're burning. The amount of deforestation that happens when a few people start cutting down trees for themselves.
Did the Easter Islanders give any thought to conservation, as the number of big trees diminished, then the number of small trees diminished, until there were no more trees?