BUT is here the reality of a power grid network...had that computer been attached to the power grid and all grids are based on a network...once you gain entrance to any network a hacker can then work his way easily to the controlling network of power grids as they car inherently also connected to the power company management network for things like email....and computer updates.....
Take it from someone who works with power companies here in Europe...easy easy easy once you have a single infected computer on any network.....
And surprise surprise most of the power grid hacks conducted by Russians here in Europe come via email phishing....so much more needs to be done on the security education of the end users....
BTW...this was the entrance method for the election hacks of DNC....and the three State voting databases....just need one single inflected computer these days...
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