High-voltage transmission

The transmission of electricity over long distances requires high voltages to limit losses.
This network consists of two stages:
– extra high-voltage power lines allow the transmission of electricity between regions or countries or to large urban areas. They operate at a voltage of 225 kV or 400 kV;
– high-voltage power lines allow the distribution of electricity at regional or local level. They supply electricity to heavy industries or rail transport. They operate at a voltage of 63 kV or 90 kV