For the most part yes. There are a few exceptions and
Posted on: March 7, 2017 at 13:04:10 CT
SuperTone
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it also depends on how you define cyber attacks. But for the most part, the US grids are not accessible by normal internet connections. You need to be at a physical location on the physical grid network/LAN. It is a closed system. all the big players have their own fiber networks that are not connected to the internet.