This was a link off that page… gives names to Google, essentially it’s Nikola Tesla style broadcast wave…
BBC News – Researchers develop new system to ‘eliminate’ batteries
EDIT: Efficiency would be dependent on distance (inverse square law for broadcasts) but should also be modifiable by the lobe shape of “directed” energies.
Mind you, you can get energy just from two parrallel wires making use of ambient radio waves. Such arrays are very large, low power, but don’t actually require input from an outside source at all.
