What is Transmission?

The following graphic explains how the electric transmission system works.

How Electricity is Transmitted


  • Energy is generated from both renewable and conventional energy sources.
  • A substation at the site of electricity generation increases the voltage for transfer to transmission lines, enabling electricity to travel longer distances.
  • Transmission lines carry the electricity from the generation substation to a distribution substation, located closer to electricity users.
  • A distribution station then lowers the voltage and transfers the electricity to local distribution lines.
  • Local distribution lines carry electricity to business and household consumers.