This is something I’ve been half-considering in the back of my mind, it just didn’t have a high enough “nice” to become a foreground task and actually get thought about properly.
I’m not sure how accurate this is – I’m sure it’s not good enough to complain to the electricity supplier if the bill differs, but an interesting idea:
Now, if I just wrap enough cable around the incoming supply, I wonder if I can run the Pi off the induced current from the house….