In ver 1 there was a mod that made truly underground power--it simply provided power without interacting with the world otherwise. You could drive over it, you could build over it--your power grid could stay a grid even when a pumpjack was in the wrong spot. Really nice for those of us who like things neat. This gets rid of the wires but does nothing else, despite being a lot more expensive than the regular versions.

Yeah, this was the mod that provided truly underground powerpoles... But it was pretty unstable. It broke my worlds so many times that I figured it just wasn't worth it. I might look into it again, but no promises.

I never had any problem other than with the lack of visible wires making it easy to place one off by one. Once I switched to placing them with grid absolute blueprints I never had any more problem.