Remember, that power is voltage times current. You can increase voltage to push as much power as you want through any wire. This is the reason why overhead line

Remember, that power is voltage times current. You can increase voltage to push as much power as you want through any wire. This is the reason why overhead lines use such high voltages. Now, the limitation is the insulation of the wire. The insulation will determine how high voltage you can use and when you increase voltage, the insulation requirements grow very quickly. The fiberoptic can transfer more power, just not for the reason you think it can.