  We study the definitions of energy, naturally arising in the splitting
theory, which is the field theoretic formulation of the Regge-Teitelboim
gravity. The latter regards our spacetime as a surface embedded in a flat bulk.
The splitting theory describes embedded spacetime in the language of the some
field theory in a flat bulk. We consider the Noether energy-momentum tensor
(EMT) and the metric EMT defined by the variation with respect to the metric of
a flat bulk. We discuss a localizability of energy. Then using these EMTs we
calculate the full energy of an isolated massive body. We compare the results
with the standard general relativity results obtained from the Einstein
energy-momentum pseudotensor (pEMT) and from the M{\o}ller pEMT. Finally, we
propose the several ways of correction of the definitions of the energy in the
splitting theory.
