What is the primary engineering justification for using high voltage during bulk power transport?

Answer

It dramatically lowers the required current (I), thus minimizing I²R heat loss

Since power delivered is P=VI, increasing the voltage for a fixed power requirement causes a proportional drop in current. This lowered current drastically reduces the proportional I²R losses.

What is the primary engineering justification for using high voltage during bulk power transport?
resistanceenergytransmissionLossconductor