We investigate whether, and to what extent, the physical phenomenon of long-lifetime
resonant electromagnetic states with localized slowly-evanescent field patterns can
be used to transfer energy efficiently over non-negligible distances, even in the
presence of extraneous environmental objects. Via detailed theoretical and numerical
analyses of typical real-world model-situations and realistic material parameters,
we establish that such a non-radiative scheme could indeed be practical for medium-range
wireless energy transfer.