One of the most technically challenging stages of the Orkney Link project has been completed, marking another significant step towards connecting Orkney directly to the national electricity transmission network.

SSEN Transmission has successfully finished horizontal directional drilling works at Dounreay in Caithness, completing the mainland landfall for the future subsea electricity cable linking the islands with the mainland.

The engineering operation involved drilling an 830 metre underground route from the coastline at Dounreay to a point beneath the seabed, allowing the subsea cable to be installed in future while minimising disturbance to the surrounding coastline and marine environment.

The completion means the underground landfall infrastructure is now in place at both ends of the project, following similar work completed at Warebeth in Orkney last year.

Together, the two landfall sections pave the way for the installation of the subsea cable that will strengthen Orkney’s electricity network and increase the capacity to export renewable energy generated across the islands.

The project also showcased innovative construction methods, including the use of remotely operated excavators to complete the final section beneath the seabed, improving safety while tackling one of the most demanding parts of the build.

Environmental specialists worked alongside engineers throughout the construction programme to reduce impacts on sensitive coastal and marine habitats.

Ian Clark, Project Director for the Orkney Link Project at SSEN Transmission, said:

“The completion of horizontal directional drilling at Dounreay represents a huge milestone for the Orkney Link Project and is a testament to the expertise, collaboration and innovation demonstrated by everyone involved.

“This was one of the most complex construction activities on the project and required careful planning to ensure it could be delivered safely while protecting the surrounding environment.

“With both landfall HDD sections now complete, we’re another significant step closer to connecting Orkney to the national electricity transmission network, unlocking renewable energy potential and supporting our transition to a cleaner, more secure energy system for our customers in Orkney.”

The work was carried out by principal contractor RJ McLeod with support from OCU Group, Lucion, Kirkwall based Leask Marine and drilling specialists Peter McCormack and Sons.

The Orkney Link forms part of SSEN Transmission’s wider programme of investment across the north of Scotland, designed to strengthen the electricity network and support the growing role of renewable energy in Scotland’s future energy system.