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So if a power line shorts, engineers can configure the nearby lines to route the load around it from their office in realtime, rather than having to send guys out into a hurricane to fix it. If enough power lines short you need to turn down the various power plants in the area to avoid overloading the whole grid. They could build a dedicated, secure network for it... but we're talking about an industry that is still being outwitted by squirrels and tree branches.
The larger problem is that nobody ever, ever, ever invests until security until they absolutely have to. The incentives just aren't there, especially if you can pass all the costs of an attack onto someone else.
I see no reason that the computer network which handles this has to be the Internet. It makes no sense.