Skagerrak 3. In 1999, the full 1,000 MW capacity was reserved by large power companies. Skagerrak 4 In November 2009, Statnett and Energinet.dk signed the agreement to construct Skagerrak 4. The capacity of Skagerrak 4 is approximately 700 MW. It had been in a test phase since 1 October 2014 and became operational at the end of 2014, when strong winds created negative prices despite the new connection. It was officially inaugurated by Frederik, Crown Prince of Denmark and Haakon, Crown Prince of Norway on 12 March 2015. As for the existing Skagerrak 1-3, the grid connection points are Kristiansand and Tjele. Differently from Skagerrak 1–3, for Skagerrak 4 a cable solution is chosen for the complete route length. The 300 million DKK Prysmian land cable on the Danish side is approximately , while the subsea cable and the Norwegian land cable is to be made by Nexans for 638 million DKK. Converter stations were built by ABB, as for Skagerrak 1–3. The combined budget is 2.8-3.2 billion DKK. The technology used was VSC, capable of black start. Although thyristor-based converters have a loss of only 0.7%, the IGBTs of VSC get close with a loss of 0.8 to 1%. Skagerrak 1 and 2 previously used Skagerrak 3 as a return cable, but 1 and 2 were again coupled so that Skagerrak 4 can use number 3 for returns. The cable also supplies 110 MW of reserve power. Some of the 24 fiber pairs may be rented for business by telecommunications companies. Sites Waypoints Overhead line in Denmark Underground cable in Denmark Overhead line in Norway Electrode line in Norway See also Baltic Cable Kontek Konti-Skan NORD.LINK NorNed Scotland-Norway interconnector References External links Description of Skagerrak 3 Pictures More pictures Animation of Skagerrak 4 4c pages for 1+2, 3, 4 Monthly exchange Electrical interconnectors to and from the Nordic grid Electrical interconnectors to and from the Synchronous Grid of Continental Europe Electric power infrastructure in Denmark Electric power infrastructure in Norway HVDC transmission lines Electrical interconnectors in the North Sea Denmark–Norway relations Energy infrastructure completed in 1977 Energy infrastructure completed in 1993 1977 establishments in Denmark 1977 establishments in Norway