One of the tsunami characteristics is tsunami wave energy. Computation of tsunami wave energy is a way to measure the power of tsunamis. However, the energy of tsunami is not usually calculated and discussed. Using tsunami simulation, we evaluate the tsunami wave energy generated by the sea bottom motion for a tsunamigenic source model involving the full length of the Makran Subduction Zone. The full rupture of the plate boundary is divided into 20 segments: width of order of 210 km but with various lengths. The tsunami energy radiation follows the tsunami propagation pattern. The exchanges between kinetic and potential energies are observed in the results. While the potential energy of tsunami waves weakens with time, the kinetic component of energy becomes stable to impact the coasts. The amount of tsunami wave energy represents only 0.33% of seismic energy released from the earthquake source. For every increase in magnitude by 1 unit, the associated tsunami wave energy becomes 1000 times greater.