  Energy of a black hole is usually quantized by invoking some area
quantization scheme after expressing the energy in terms of the horizon area.
However, in this approach one has to quantize the local and asymptotic energy
of the black hole separately and the two results do not manifest any physical
correspondence with each other. Here, as opposed to this practice, we find the
unique energy spectrum of black holes by adopting a top-down approach. The
physical links among the underlying quantum theory, statistical mechanics and
thermodynamics of the black hole horizon play the central role in determining
the energy spectrum. The energy spectrum that we obtain, explicitly reveals the
correspondence between asymptotic and local observations through the presence
of the surface gravity of the horizon as a parameter in the spectrum, rather
than being expressed as a function of area and consequently getting quantized
in the usual approach. Thus, our result presents a new view as far as black
hole energy quantization is concerned. The calculations are performed using the
quantum geometric description of black hole horizons as laid down by loop
quantum gravity.
