There is relatively little energy actually stored within the wire. So little that it is freely moved in and out and you can’t even measure how much is being used with any but the most sensitive of devices.
What energy there is, is lost in many ways. Radio waves escaping the wire and heating of the wire are the main ones.
The wire is either electrified or not. It’s not synonymous with a pipe filled with, say, water. In fact, when a section of grid spanning hundreds of miles is electrified by a power generation source, the whole thing is electrified at once, or least at a significant percentage of the speed of light.
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