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The numbers you've quoted, from page 7, are per MW mile, not per mile.

Thanks, that was a really quick check. And yeah, that would increase the costs markedly.

(My initial thought on posting was that $30 billion would not be enough, though the first read of actual per-mile costs, neglecting per MW-mile, seemed to suggest otherwise.)

This PDF from Wisconsin puts the cost at $280k-390k/mi depending on the voltage of the line. They put the cost of underground transmission lines at $1.5M-2M/mi for the same voltages.

https://psc.wi.gov/Documents/Brochures/Under%20Ground%20Tran...

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