  We calculate the gravitational energy spectrum of the perturbations of a
Schwarzschild black hole described by quasinormal modes, in the framework of
the teleparallel equivalent of general relativity (TEGR). We obtain a general
formula for the gravitational energy enclosed by a large surface of constant
radius $r$, in the region $m\,<<\,r\,<<\infty$, where $m$ is the mass of the
black hole. Considering the usual asymptotic expression for the perturbed
metric components, we arrive at finite values for the energy spectrum. The
perturbed energy depends on the two integers $n$ and $l$ that describe the
quasinormal modes. In this sense, the energy perturbations are discretised. We
also obtain a simple expression for the decrease of the flux of gravitational
radiation of the perturbations.
