In general, a network of current is able to carry more energy with respect to the AC. The voltage l

AC power grids, as a consequence of the variation of the amplitude of the current and voltage function limited depending on the time required to load and unload limited the capacity of the wires causes additional energy losses. If you use the current, these losses do not occur.
In general, a network of current is able to carry more energy with respect to the AC. The voltage level determines the section of insulation and / or separation of conductors as a given constant power DC voltage is less than the peak value of the alternating current.
In the absence frequency (variation of the amplitude versus time) is not necessary synchronization networks, as there is no "phase" and that the magnitude is constant versus time (excluding voltage limited drop by Ohm )
The following video shows the order in ABB for the interconnection of 232 km of which 186 km pass by sea between Ireland and the UK High Voltage Direct Courrent (HVDC) with a carrying capacity of 500 MW
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