Brenntangen - Solberg
CrossingOperationalNO420 kV2.7 km2017
Status:Operational
Type:crossing
Website:www.statnett.no
Brenntangen–Solberg (Inner Oslofjord) is an onshore–subsea 420 kV alternating-current transmission link connecting Solberg (Hurum) and Brenntangen (Vestby) within Norway. Delivered as part of Statnett’s Inner Oslofjord reinforcement, the project was designed to replace legacy links (1958/1975 vintage) and to strengthen security of supply for central Eastern Norway while facilitating power...
Supply Chain (1)
Project Timeline (11)
1 Sept 2017Onss Commissioned
Statnett commissioned the Solberg (Hurum)–Brenntangen (Vestby) 420 kV subsea cable installation in the inner Oslofjord in September 2017, putting this section of the Indre Oslofjord reinvestment project into operation as the first of two planned cable systems. The project involved reinvestment in new 420 kV cable infrastructure to secure the electricity supply to the central eastern Norway region.
2017Commercial Operations Full Power
In 2017, Statnett SF commissioned the 420 kV Solberg–Brenntangen line, a 2.7 km double-circuit AC underground cable connection between Solberg in Hurum (Buskerud) and Brenntangen in Vestby (Akershus), bringing the Brenntangen–Solberg interconnector into full commercial operation.
2017Cable Installation Complete
Project works on the 420 kV Solberg–Brenntangen underground line between Solberg and Brenntangen were completed in 2017, enabling commissioning of the Brenntangen–Solberg interconnector.
1 Jan 2017Cable Installation Start
As part of Statnett’s Indre Oslofjord project to replace two ageing cable systems, Nexans Norway undertook engineering, production and installation of new 420 kV subsea cable systems. Installation work in and around the inner Oslofjord took place during spring and summer 2017–2018, with the first seven subsea cables installed on the Brenntangen (Vestby)–Solberg (Hurum) link in summer 2017.
2016Onshore Construction Start
Construction works for Statnett’s new 420 kV Solberg–Brenntangen underground line, forming the Brenntangen–Solberg interconnector between Solberg (Hurum) and Brenntangen (Vestby) in Norway, started in 2016.
15 Jul 2015Cable Supplier Selected
On 15 July 2015, Nexans announced it had been awarded a contract worth about €50 million by Statnett to design, manufacture, test and install two new 420 kV subsea cable systems in the Inner Oslofjord, including the Solberg–Brenntangen link that forms part of the Brenntangen–Solberg interconnector. The project uses Nexans’ XLPE subsea cable technology, with production at its Halden facility and installation using Statnett’s cable-laying vessel M/S Elektron and Nexans’ Capjet trenching system, with completion planned for 2018.
15 Jul 2015Cable Preferred Supplier
On 15 July 2015, Statnett announced Nexans as the supplier for two new 420 kV subsea cable systems in Indre Oslofjord, including the Solberg (Hurum)–Brenntangen (Vestby) link, with Nexans to design, produce, test and support installation of seven individual PEX cables on this route using Statnett’s laying vessel M/S Elektron. The project, valued at about EUR 50 million and planned for completion in 2018, is intended to replace older cables from 1958 and 1975 and strengthen power supply in eastern Norway.
11 Apr 2014Planning Consent Awarded
Authority: Norges vassdrags- og energidirektorat (NVE) · Licence: Concession for new 420 kV subsea cables and landfall/jointing stations between Solberg and Brenntangen (inner Oslofjord)
On 11 April 2014, the Norwegian Water Resources and Energy Directorate (Norges vassdrags- og energidirektorat, NVE) granted Statnett a concession for new 420 kV subsea cable connections across the inner Oslofjord, including the Solberg–Brenntangen link, with associated new landfall and jointing (muffe) stations. The approval replaces existing ageing cables that will be removed once the new facilities are in operation, and is intended to improve security of electricity supply in Eastern Norway and safeguard trading capacity between Norway and Sweden.
Date TBDFid Financial Close
Statnett’s Board of Directors has taken an investment decision for the Inner Oslofjord subsea interconnectors, which include the 420 kV Solberg–Brenntangen cable link between Hurum and Brenntangen in Vestby municipality. This decision enables Statnett to proceed with the renewal project designed to reinforce the power supply in central Eastern Norway by replacing ageing subsea connections across the Inner Oslofjord.
Date TBDOther Permit Awarded
Licence: Licence for new subsea cables across Inner Oslofjord, including the Solberg–Brenntangen link
The Norwegian Water Resources and Energy Directorate (NVE) granted Statnett a licence for new subsea power cables across the Inner Oslofjord, covering the 420 kV cable links including the Solberg–Brenntangen interconnector that reinforce electricity supply in central Eastern Norway.