Electricity Transmission Lines

[Colortec]

Is it possible to determine where the electricity was generated on a particular line?

[dipee65]

No, theres no particular individual characteristic you can trace back to a source of power. In fact, by the electricity gets to you it will be "mixed up" from several sources.
Think of a water analogy of several rivers feeding into a large pool. You take a drink from the pool and you don't know which river it came from. It will be a mixture from several.
In fact "pool" is the term the electricity managers use to buy and sell power on the energy market.

[2825]

Yes it is. You check the date on the particular electron you are interested in. EU directives state that each electron be stamped before transmission.