I was just going to write that it already exists, but @mrlaconic beat me to it.
And, @IchtheosaurusRex LOL! I’m all for hydro power. We have all the hydro power we need here in Norway, and wouldn’t need to build any more if we just upgraded the old stations, but people here are too fond of new shiny things and governments don’t think ‘upgraded’ sounds as good as ‘built new’ in their achievements they drag out at election time.
Electricity is interesting, though. It’s always been a matter of ‘acceptable loss’ over distance and the cost of the material carrying the power. ‘Air’ isn’t an efficient carrier of current. Copper isn’t even the most efficient metal conductor, but it’s efficiency, relative to cost made it the industry choice. If we were able to cool the lines to near absolute zero, then there are ceramics that would work (and are currently by NASA) very well. Developed from studies of superconductors. Superconductors, which when brought down to very low temperatures turn into superhighways of current—they conduct electricity without any resistance whatsoever.
Short distance is possible now, with a certain amount of wasted energy, but sending it like waves though the air, like radio? Nah.