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for the specific MW, at high voltage, current is low..... at low current we need conductor of Small dia ultimately economical it is.
Because there is no other way to transmitt bulk of power to remote areas.
to reduce power loss
to reduce cost
Electricity deliver from power plant have big capacity shall use H.V because to reduce losses in cable transmission.
To decrease current.....................
decrease losses........................
decrease conductor material....................
decrease size of poles................................
in short decrease cost......................