There's a huge cultural difference between Telecom and Power.
When AT&T started out, they hired telegraph boys to operate the switches, and then after getting tired of their antics, fired them en masse and replaced them with young women. That sparked the first wave of people tampering with telecom wires to pull pranks, and the telecom sector has been familiar with that issue ever since. Phone phreaking, as in tampering with crossbar switches remotely, is at least as old as the Arab Israeli war of 1948.
Power utilities, meanwhile, have had some protection from the simple fact that even sociopaths don't like to risk their own lights going out. Even during civil wars, militias will spare the other side's power because they want to use it when they conquer the other side's territory. Power utilities have to worry about copper thieves, squirrels, and tree branches. Getting bits diddled remotely by bad actors is not something they've had to think about as long.