Electrical power can only be stored in 2 forms.1.Inductance 2.Capacitance. These are the two forms required to carry the energy to longer distances whether wired or wireless. Hence reactance associated is inevitable.
In AC transmision if there is no Magnetic field and magnetic flux which is proportional to current I and inductance L and Electric energy field proportional to U2 and capacitancem so there willl be no trasmission of el energy. There is constant oscillation of capacitive and inductive energy in the line.
The transmission of power is nothing but the transmission of the alternating electric and magnetic fields. For establishing these fields we need reactive power. Then only real power can be transmitted.The reactive power will be generated only in the presence of an inductor or capacitor which has the capacity to reduce or increase the reactive power component.So if reactance is zero ,it means there is no inductor or capacitor,no reactive power ( no establishment of the electromagnetic fields) so no power transfer.Hope this clears your doubt.
I agree with the answer of Poornima....Power can be transferred only if reactance is present. In case reactance X is zero, there will be no transfer of power as transfer of power will not be possible without phase shift if equal voltages are to be maintained at both ends. Also Maximum power will be transferred from the sending end to receiving end when the line reactance is √3 times its resistance (i.e. X = √3 R).