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October 8, 2021

Hunterston – Deeside HVDC Line – New – 600 kV, UK

By Carmen

Hunterston – Deeside HVDC Line – New – 600 kV is a 600kV underground line with a length of 420km from Hunterston, Ayrshire, the UK, to Deeside, Alyn and Deeside, the UK.

Construction works on the Hunterston – Deeside HVDC Line – New – 600 kV started in 2016 and the project was commissioned in 2017.


The Hunterston – Deeside HVDC Line – New – 600 kV, which is an underground line, is being operated by National Grid. The Hunterston – Deeside HVDC Line – New – 600 kV is a new line. The line carries direct current (AC) through double circuit cable.

Hunterston – Deeside HVDC Line – New – 600 kV project development status

The development of the Hunterston – Deeside HVDC Line – New – 600 kV project was approved by The Office of Gas and Electricity Markets in 2016 and the project works were completed in 2017.

Contractors Involved

Prysmian Cables & Systems and Siemens was appointed by National Grid to supply the cables for executing the 600kV Hunterston – Deeside HVDC Line – New – 600 kV.

About National Grid

National Grid Plc (National Grid) is an energy utility, which transmits and distributes electricity and natural gas. The company owns and operates electricity and gas transmission and distribution networks; and also serves as transmission owner and system operator. It provides installation and maintenance services to electricity metering and LNG suppliers; develops and operates electricity inter-connectors; and carries out LNG storage; and insurance and corporate activities. National Grid operates an energy monopoly entity regulated by Ofgem. It also builds sub-sea electricity inter-connectors to join the UK to renewable energy on the continent.


All publicly-announced T&D Line & Substation projects included in this analysis are drawn from GlobalData’s Power IC. The information regarding the projects is sourced through secondary information sources such as country specific utility players, company news and reports, statistical organisations, regulatory body, government planning reports and their publications and is further validated through primary from various stakeholders such as power utility companies, consultants, energy associations of respective countries, government bodies and professionals from leading players in the power sector.

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