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Notes -
It's specifically the transformers that are vulnerable to E3; the extra voltage/current buggers up the assumptions that go into their design, so they lose efficiency (efficiency at transmitting the normal power from power stations) and, yes, overheat. Of course, power grids don't work without the transformers, but the long wires themselves are in no danger (we know that one experimentally due to the Carrington event).
But yes, transformers are metal and they are vulnerable if not unplugged.
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