The primary reason for using extremely high voltages for transmission is to increase efficiency and reduce power loss over long distances. According to the power formula, Power (P) = Voltage (V) × Current (I). When voltage is stepped up, the current is reduced for the same amount of power. Power loss in a conductor is proportional to the square of the current (Loss = I²R). By lowering the current, we significantly minimize energy lost as heat, making long-distance transmission much more economical. A lower current also means we can use thinner, lighter, and more cost-effective wires, which reduces the construction and engineering costs for our towers and lines.