  The energy of a Gamma-Ray Burst is one of the most interesting factors that
can help determining the origin of these mysterious explosions. After the
discovery that GRBs are cosmological it was thought, for a while that they are
standard candles releasing $\sim 10^{51}$ergs. Redshift measurements that
followed the discovery of GRB afterglow revealed that GRBs are (i) further than
what was initially believed and (ii) have a very wide luminosity function. Some
bursts revealed an enormous energy release with a record estimate of $ 1.4
\times 10^{54}$ergs for GRB990123. The energy budget was stretched even further
when it was suggested that the conversion efficiency of producing gamma-rays is
low. The realization that GRBs are beamed changed this perspective and brought
the energy budget of GRBs down back to a "modest" $\sim 5 \times 10^{50}$ergs.
I discuss here various estimates showing that GRB energy is narrowly
distributed and discuss the implications of this conclusion to GRB models.
