Actually Zid the OP is correct, technically there is no physcial conection from beginning to end, all transformers work with induced currents, not coppper to copper connections.
Large CMEs do send enough plasma to break through our ionosphere.
The National Academy of Sciences report states: “A severe space weather event in the US could induce ground currents that would knock out 300 key transformers within about 90 seconds, cutting off the power for more than 130 million people.”
Having said that, I really doubt there is anywhere clse to enough impact to cause plate disturbances.