One application could be to join up the world's electricity grids, though I suspect that our land-mass politics could well be a barrier to that. It could smooth

One application could be to join up the world's electricity grids, though I suspect that our land-mass politics could well be a barrier to that. It could smooth the supply/demand requirements between the dayside and the nightside of the earth. It could likely be done with ordinary cables, but the power loss would be significant.