I was wondering if Superposition Theorem can be applied to find power in a circuit?

Indirectly, yes, since power can be expressed in terms of voltages and currents which CAN be applied to linear circuits.

Calculating power directly using superposition, however, does not work because power goes like the square of the voltage or the current. The fundamental theorem of superposition relies on the fact that things add linearly. Power doesn't behave that way. If you double the voltage, for example, power goes up by a factor of four.