For a mature hurricane, the amount of kinetic energy generated is equal to that being dissipated due to friction (See Emanuel 1999 for details). One could either integrate a typical wind profile over a range of radii from the hurricane’s center to the outer radius encompassing the storm, or assume an average windspeed for the inner core of the hurricane. Doing the latter and using 40 m/s (90 mph) winds on a scale of radius 60 km (40 n.mi.), one gets a wind dissipation rate (wind generation rate) of:
1.3 x 1017 Joules/day or
1.5 x 1012Watts.(1.5 trillion Watts!)
This is equivalent to about half the world-wide electrical generating capacity!