At what voltages are transmission lines typically energized?

Transmission lines are typically energized at high voltages to efficiently transport electricity over long distances. The voltages of 765kV, 500kV, and 345kV are representative of the higher voltage levels used in the transmission network.

These high voltage levels are crucial because they minimize energy losses that occur due to resistance in the conductors. The greater the voltage, the lower the current for a given power level; hence, this reduces I²R losses (where I is current and R is resistance).

Transmission lines operating at these high voltages enable the delivery of large amounts of electrical power from generation sources, such as power plants, to substations nearer to populated areas, where the voltage is then stepped down for distribution to end users. This design also supports the demand for electricity and enhances the stability of the grid.