A wire fence insulator and buffer (10, 100, 200) for retrofitting to a wire fence of the type where the fence wire (18) passes through lateral apertures (26) in fence posts (16). The wire fence insulator and buffer (10, 100, 200) has an inner member (12,112, 212) and an outer member (14, 114, 214) capable of coupling together around the fence wire (18) within respective ones of the lateral apertures (26) of the fence post (16) to inhibit leakage of electrical energy from the fence wire (18) to the fence post (16) and/or to inhibit wear and corrosion of the fence wire (18) with the fence post (16). The inner member (12, 112, 212) has a wire slot (38, 44) for placement of the inner member (12, 112, 212) laterally onto the fence wire (18) on one side of the fence post (16) and the out member (14, 114, 214) has a mating slot (68, 74) for lateral placement of the outer member (14, 114, 214) onto the fence wire (18) on the other side of the fence post (16) and the inner member (12, 112, 212) and the outer member (14, 114, 214) being able to insert into the lateral aperture (26) and couple together when in the lateral aperture (26) for retrofitting of the wire fence insulator and buffer (10, 100, 200) to a wire fence. A wire fence system and method of electrification of the wire fence are also claimed.