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Re:Benefits of a single US electrical grid with high-voltage... by mikeash on Wednesday January 27, 2016 @12:44PM (#10981505)
My understanding is that there are five separate grids which are not frequency synchronized, as described here:

https://en.wikipedia.org/wiki/Eastern_Interconnection

They are connected, but with DC or other techniques that don't require matching phase.

Not so?

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