Power companies == greedy idiots
Nobody of any intelligence will accept this by their own choice, but try to force it on people and watch the backlash. Meters can be bypassed by someone suitably motivated who knows what they're doing - "you tamper with my gear, I'll tamper with yours, bitch" could apply here. Not condoning anything, just saying that you can only push so hard before some people start pushing back.
"will they have to encrypt the signalling on the remote powerline to stop local hackers/crims from monkeying with the neighbourhood's devices for kicks?"
They should, but what's the betting they don't bother or do it half-assed, then make legal threats against anyone who discovers a flaw and tries to disclose it.
"Utilities, I thought they LIKED selling electricity to us, seems they now want to control and limit it?"
They've not been investing enough of the profits they make into keeping the infrastructure up-to-date with demand. Now they're at a point where some areas suffer rolling blackouts and brownouts (some parts of California for example) because they can't supply enough power to meet demand at times. God forbid they spend some of their profits on improving capacity and educating consumers about being more energy-smart, because then they'd have to answer to their shareholders.