PSC provided specialist HVDC engineering consultancy support to SHE Transmission for the Western Isles HVDC scheme by reviewing and updating an Invitation to Tender (ITT) document for issuing to HVDC vendors. PSC’s scope included HVDC technology advice on equipment and studies specifications, incorporating lessons learned from the Caithness–Moray HVDC project, integrating SHE Transmission internal standards, and ensuring the ITT was vendor-neutral and addressed AC/DC system interaction for the island network interface.