An electric wire fence system comprises at least one electric fencing wire (10) attached to a support structure and an energizer unit to energize the electric wire (10). The electric fencing wire (10) comprises twisted wires wherein a first wire (12) is a non-insulated steel wire connected to the energizer unit； and a second wire (14) is a coated steel wire having a visibility-enhancing color. The wires are longitudinally twisted together in an alternating manner to provide an enhanced elasticity； i.e. in two consecutive twisted sections, the wires are twisted in alternate directions. In particular the electric wire (10) is a two-strand wire consisting of the first (12) wire and second wire (14). In one embodiment, the second wire is electrically insulated； and the first wire and second wire are locally electrically interconnected at one or more positions along the length of the electric wire.
