I wonder if paying the boring company to make a tunnel for the cables would be cost effective and avoid complaints. I believe that they can bore tunnels without digging along the path on the surface.
Horizontal drilling is already part of the plan in many places - Elon Musk isn't the first person to think of it. It still costs loads to do it per mile - by the looks of it you'd have six bores with three cables each (or one or two much larger bores). And a deep, concrete-sheathed cable is a huge pain to maintain compared to cables around 1-3m underground.
