The tidal energy due to Moon is 1.8x10^17 J. I found the tidal energy of the earth due to the Sun to be 5.2x10^25 J. Can any one help me (to confirm) find such energies?
Well, the time-rate-of-change of Earth's Rotational Kinetic Energy would be
d/dt ( L^2/2I ) = w dL/dt
The Moon is receding from earth at 3-4 cm/yr which defines dL/dt, and Earth's angular frequency is once around per day. A quick calculation gives me 2-3TW of power dissipation.