[nine_k]

I suppose that power lines may start looking more like pipelines. These can be above-ground is the actual piping is not heavy, on lower pylons with a reduced span. Liquid nitrogen is lighter than water, does not need high pressure, and the insulation is mostly styrofoam.

The voltage can be substantially lowered, because high currents don't lead to high losses; the current may be made as high as practical, near to the limit of the material's superconducting state.