Cable works underway in Shetland.
Cable works underway in Shetland.
Cable works underway in Shetland.
Cable works underway in Shetland.
Cable works underway in Shetland.

Shetland HVDC Link Project Onshore Cable Installation Now Underway

July 21, 2021
Work to install 10 km of underground cable marks a milestone for the 600-MW Shetland HVDC project.

SSEN Transmission announced that work to install 10 km of underground cable is now underway in Shetland and Caithness, marking a milestone for the 600-MW Shetland HVDC project.

The onshore cable will run from the converter station at Kergord in Shetland and the Switching Station at Noss Head in Caithness to the subsea cable landfall points. Once installed, it will connect with the 260-km subsea HVDC cable, which will enable Shetland's connection to the national grid for the first time and facilitate the connection of new renewable generation, unlocking Shetland's renewable potential.

The cable installation works are being carried out by SSEN Transmission's principal contractor, cable specialists NKT and follows the progress made on the construction of the switching station at Noss Head and the converter station at Kergord.

Lead Project Manager Chris Finnigan, responsible for the HVDC cable installation project, said: "It's great to see the cable installation getting underway and Shetland's connection to the U.K. grid for the first time becoming a reality. It is a significant milestone for the project, it has taken a lot of hard work and collaboration with our colleagues at NKT to get to this stage.

"We're extremely grateful to everyone who lives along the respective onshore cable routes for their co-operation and understanding, and look forward to delivering the 260 km of cabling safely with the least amount of disruption possible."

Arne Abrahamsson, NKT's project director, said: "This is a truly significant project not only in terms of its technical complexity but also in terms of the role the project will play in the transition to net-zero emissions once it is complete. It has been quite a journey to get to this point in the project, and we are delighted to see everyone's hard work and the months of planning and pre-construction work coming to fruition."

As the teams in Shetland and Caithness start working on the cable installation, NKT has also initiated the manufacture of both the land and submarine cables, joints and terminations, in preparation for installation works next year.

In addition to preparing to start the onshore cable installation, SSEN Transmission has also been carrying out marine surveys ahead of the installation of the subsea cable section, which is expected to start in late summer 2022. The survey vessel Nordhoek Pathfinder is conducting pre-lay surveys that are carried out to create an updated picture of the subsea cable route from Caithness to Shetland. These help the project team understand the seabed condition, sediment depth, locate bedrock, and identify any hazards such as shipwrecks or unexploded ordnances.

For the nearshore route, an autonomous survey vessel has been surveying the cable route close to the Shetland shoreline at Weisdale Voe, acquiring survey data at the end of May. The data captured will help to ensure the cable route is designed and constructed to suitably protect the cable and other sea users from harm.

To find out more about the £660 million (US$896.6 million) Shetland HVDC project and the progress being made, visit here.

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