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Originally Posted by UFO
Please explain how capacitance causes loss.
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Ever stood close to (well, not TOO close, though :-)) to a high voltage power line, and heard the 60-cycle hum? That's power being lost. Changing currents (and AC is always changing, by definition) generate electromagnetic radiation, which is energy lost over & above the resistance of the conductor.
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...it is far less efficient to boost line voltage to 110kV as DC than AC.
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But it is significantly MORE efficient to boost voltage to 1000 kV and send 1000 miles or so as DC, than as A/C.