Recently I came across some pictures during Edison’s day, where the power line was in DC. Since there are lots of power loss (see Why Transfer Power At High Voltage), lots of cabling were required for power transmission. And the end result? Below is the picture that I managed to Google. At that time, in some part of the city people literally cannot see the sky!
Picture from wiki : http://en.wikipedia.org/wiki/Electric_power_transmission
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