 In addition, overhead lines do not lend themselves at all well physically to the incorporation of cryogenic hydrogen piping, due to the likely weight of the transmission medium and the considerable brittleness of supercooled materials.It would probably be necessary for a supercooled hydrogen-carrying transmission line to be subterranean, and this in turn means that for such a cable, if it were of any distance (e.g.over 60 km), the power would have to be converted to DC and transmitted as such, since otherwise the capacitive losses would be too high.