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Operations Asset Management

NIA SSEN 0033: ACSS Conductor Study

Key activities

Overhead line conductors in Great Britain are predominately Aluminium Conductor Steel Reinforced (ACSR). Many of these will require replacement in the RIIO-ED2 price control period. The replacement schemes will require increased current carrying ability. This is currently being achieved by the utilisation of High Temperature Low Sag (HTLS) conductors. Composite cored HTLS 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.

Expected outcomes

Aluminium Steel Supported technology, may offer a different cost performance option and may offer lower installation risk than the composite core conductor solution.  The project seeks to quantify any benefits available from ACSS and compare ACSS H285 to other conductor options in modelled scenarios.


NIA £53,000

Start/end date


Project Manager

Tim Sammon