From power plant there is a Step up transformer which convert generated voltage in to high voltage to reduce losses.
Power plant can be any form hydro,wind,coal,thermal.
After that it is converted into 230KV to supply substation after substation it is converted in to 69KV and then to 11KV, now some industries require 11KV so before further step down of voltage it is supplied to industries, after that 11kV is further step down to 220-240V for houses and other residential areas
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