Why reactive power cannot be transmitted to long distances?

• If reactive power is to be transmitted through long distances in the power system It requires larger size of the power system equipment (transformers and cables).
• It is inefficient during the high real power transfer and also requires higher voltage magnitude gradients.
• It causes high real and reactive power losses if reactive power is transmitted through long distances. 
• It can lead to damaging temporary over voltages following load rejections. When the receiving end circuit breaker opens with transmission line still energized from sending end, then over voltages occurs as the voltage magnitude depends upon the reactive power in the system. Over voltage will damage the insulation of the conductor and wingdings.