It's estimated the world will run out of mined copper in 25 years?

Question

Would could we use to replace it in electrical systems?

Answer 1

Aluminum comes to mind.  Aluminum has been used in the past for household wiring.

Answer 2

zinc?

Answer 3

Who estimated that?  I have raw copper here on my property, but won't mine it until the price hits $5 per pound.  The price has recently dropped from ~ $4 to $3,80 per pound.  

Let us say we run out of copper, silver or gold is a better conductor than copper. Because the communications industry has switched to fiber optics, the demand for copper is slowing. Still power distribution uses a large amount of copper.  I suspect we will eventually switch to higher frequencies to transfer power & thus take advantage of the "skin effect" (where the current travels on the outside of the conductor) & thus cover some pliable material with a thin coat of copper.  

Here's some info on copper prices: http://www.metalprices.com/