Overhead line conductors both in England and Scotland are predominately Aluminium Conductor
Steel Reinforced (ACSR). Many of these will require replacement in the RIIO-ED2 price control
period. Many of these replacement schemes require increased current carrying ability. Presently to
achieve the increase in current High Temperature Low Sag (HTLS) conductors are being utilised.
Composite cored HLTS conductors have been trialled and, while effective, have exhibited higher
installation risks than those associated with steel core conductors.
Horizon scanning activity has revealed another potential HTLS solution which utilises Aluminium
Conductor Steel Supported (ACSS) conductor technology. This may offer a different cost
performance option and may offer lower installation risk than the composite core conductor