It relates to the process of moving electricity that is generated by turbines in a thermal or hydro electric power plant to power sub stations that are placed near populated areas. It is noted to maintain a sub station at an area that is close or in the middle area to supply electricity efficiently to huge population in order to save costs on making extra sub stations. Therefore, the lines offer a way for electricity to travel from power plants to near places where it can be used by the consumers.
Distribution starts after electricity reaches the sub stations that are made near the populated areas. It is the process of carrying high voltage electricity to customers by converting high voltages of around 11000 V to 220 V as it is safe and efficient in houses, offices and factories. The conversion is done through transformers. Also know that the lines carrying the electricity to end consumers are thin with respect to transmission lines. Electricity is carried in single phase to near places as they get it from a phase coming from the power plant.