ABB

ABB supplied the original HVDC converter infrastructure for the Skagerrak 1 and 2 interconnector between Kristiansand in Norway and Tjele in Denmark. Commissioned in 1977, Skagerrak 1 & 2 formed a bipolar HVDC scheme providing 500 MW of transfer capacity at 250 kV. ABB was responsible for the design, manufacture and installation of the onshore converter substations at both terminals, including thyristor valve halls, converter transformers and associated high‑voltage equipment and controls. Subsequent ABB communication and reference data on the Skagerrak system confirm that the company delivered the first two links in the 1970s and is listed as manufacturer of the Skagerrak substations. This work established the core cross‑border HVDC conversion capability on which later Skagerrak 3 and 4 extensions were built.