not true. in standard HV-AC lines, power losses are ~10% per megameter. HVDC gets to 3-5%. So Nevada to Seattle would be at most 20% loss, and in practice 15%, and with HVDC closer to 7%.
https://www.nationalgrid.com/sites/default/files/documents/1...
https://en.wikipedia.org/wiki/Inverse-square_law
This is where you picture an expanding wireless sphere of transmission from a point source and since the surface area of this sphere grows by the square of the distance you get this "power attenuates by the square of the distance" rule.
This of course doesn't apply to power over a 2D cable.
My point of view with Tesla vs Edison is that they were both right and wrong under select circumstances.