  A decade ago, non-radiative wireless power transmission re-emerged as a
promising alternative to deliver electrical power to devices where a physical
wiring proved to be unfeasible. However, existing approaches are neither
scalable nor efficient when multiple devices are involved, as they are
restricted by factors like coupling and external environments. Zenneck waves
are excited at interfaces, like surface plasmons and have the potential to
deliver electrical power to devices placed on a conducting surface. Here, we
demonstrate, efficient and long range delivery of electrical power by exciting
nonradiative waves over metal surfaces to multiple loads. Our modeling and
simulation using Maxwells equation with proper boundary conditions shows
Zenneck type behavior for the excited waves and are in excellent agreement with
experimental results. In conclusion, we physically realize a radically
different power transfer system, based on a wave, whose existence has been
fiercely debated for over a century.
