A good number is around 17%. But, it depends on how far the electricity is being carried. Generally the amount of power loss due to transmission depends on the resistance of the material to conduxt electricity. While copper, which is the metal most frequently used, has higher resistance than some other metals, it costs substantially less, and is therefore economical. Very large power lines are run at higher voltage to reduce the amount of power lost during transmission.
The reduction in power associated with transporting energy between regions in the US is small compared to the differences in price. While this could force down the price of electricity for consumers, money in your pockets is money out of the pockets of local utilities. This is why some entrenched regional energy producers are lobbying intensely against a Smart Grid plan to connect various regions.
Electricity must travel through miles of power lines before it reaches homes. As it travels, electricity meets resistance in transmission lines and some power is lost. The amount of power that is lost can vary since more electricity is lost as it travels further, but there is a line loss calculator available online as well as a state-by-state profile. It is believed that line loss accounts for about 6.5% of total energy disposition.
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