I’m fasting! No need for energy at all.

That puts you in an energy deficit, but you still need and are using energy. Until your body is decomposed it uses energy (after you die your body is energy for the bacteria decomposing it).

Fasting can use previous/saved energy, but it still needs energy.

Yeah, that was half of a joke.

Got a wind-up computer, have you?

(Maybe that OLTP project was onto something, after all)

Seriously, might consider buying a few solar panels, but just for camping needs. It’s impossible to setup locally due to regulation and such.

It's probably also good to have things on hand as an insurance policy anyway. If shit hits the fan regulations don't apply anymore. No one is going to complain about solar on your roof if the grid isn't reliable.