Skagerrak 3
Cross BorderOperational
NODK
440 MW350 kV240 km1993Also known as:SK 3, SK3, Pole 3, Skagerrak Pole 3
Status:Operational
Capacity:440 MW
Type:cross border
Website:www.statnett.no
Skagerrak 3 is an HVDC (line-commutated, “HVDC Classic”) subsea interconnector between southern Norway (Kristiansand) and Jutland, Denmark (Tjele). Commissioned in 1993, the pole is rated at 350 kV DC with a net transmission capacity of approximately 440 MW and forms part of the broader Skagerrak multi‑pole interconnection framework connecting the...
Supply Chain (2)
Project Timeline (6)
26 Mar 2019Other Permit Submitted
Licence: Approval to introduce implicit loss handling on the Skagerrak Interconnector using a fixed annual loss factor
On 26 March 2019, transmission system operators Energinet and Statnett submitted a joint application to introduce implicit loss handling on the Skagerrak Interconnector, which consists of four parallel HVDC cables including Skagerrak 3, proposing implementation of a fixed annual loss factor based on historic median flows and presenting the methodology, rationale, and expected socio-economic effects for Norway and Denmark.
2015Major Maintenance
In 2015 Hitachi Energy completed a major upgrade of the Skagerrak 3 HVDC Classic pole’s control system (MACH), enabling the Skagerrak 3 link between Kristiansand (Norway) and Tjele (Denmark) to operate in a bipole configuration together with the new Skagerrak 4 HVDC Light link for Statnett and Energinet.dk.
2014Operations Other
In 2014 the Skagerrak system was reconfigured so that Skagerrak 3 began operating in a hybrid bipole together with Skagerrak 4, while Skagerrak 1 and 2 again formed a separate bipole. In this new arrangement SK3 (an LCC monopole) and SK4 (an asymmetric VSC monopole) share the same earth electrode, and although they have different power ratings and DC voltages, their similar rated DC currents result in low currents to ground.
1993Cable Supplier Selected
Nexans was the selected supplier for the Skagerrak 3 subsea HVDC cable, delivering a third 350 kV submarine cable across the Skagerrak strait between Denmark’s Jutland peninsula and Norway in 1993, upgrading the interconnector with an additional 500 MW of transmission capacity.
1993Cable Installation Complete
In 1993, Nexans completed delivery and installation of the Skagerrak 3 350 kV HVDC subsea cable between Denmark and Norway, upgrading the Skagerrak interconnector with a third link that added 500 MW of transmission capacity alongside the existing Skagerrak 1 and 2 cables.
1993Commercial Operations Full Power
Skagerrak 3, a 350 kV HVDC monopole link between Kristiansand in southern Norway and Tjele in Denmark, was commissioned and became operational in 1993, adding roughly 500 MW of transmission capacity to the existing Skagerrak interconnector system owned by Statnett and Energinet. This third pole, using line-commutated converter technology, was integrated with the earlier Skagerrak 1 and 2 links to increase cross-border power exchange capability between the Norwegian hydro-based system and the Danish system, and has operated as part of the interconnector since that time.