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are mainly used for data transmission such as telephone calls or data from sites. These fibre optic cables are not used for current energy. Fibre optic cables can transmit light. The data are converted into light signals, transported through the glass fibre and than converted into legible data at the terminal.  In a normal current cable you can do that too: then the data is transported as an electron in the current.  Fibre optic cables are much more popular because they can carry a lot more data than a power line. And data transmission from smart phones has increased: As I was informed only smart phones worldwide now need 4,200 MW, i.e. 3 nuclear power plants as German Brockdorf. Better to produce this energy need by solar energy!