One pole is opened for work, so the current takes the honeycomb road around the break, and the town at the end of the line never notices.
An artistic imagining, not existing hardware: a long distance power line across a Martian highland, drawn as a technical plate, with one conductor opened for repair while its current is carried around the break through a hexagonal switch frame. A bipole transmission link really can keep running with one pole out of service, which is the physical reason a break like this need not mean a dark town.Image: poweringspace.com. Artistic imagining.