Statnett installed a temporary submarine power cable between Evje in Østfold and Teigen in Vestfold, replacing the Evje–Bastøy–Teigen route for contingency purposes. A Norwegian notice to mariners dated 21 December 2012 reports that installation of this unburied, unprotected cable had been completed and marks its route in the Oslofjord south of Bastøy.
Statnett planned that the new 420 kV subsea interconnector across the Oslofjord between Teigen and Evje (Teigen–Bastøy–Evje route), with an estimated cost of NOK 900 million, would be completed and fully operational in 2012, following a licence application submitted to NVE in December 2009.
Statnett planned to start construction of the new 420 kV subsea cable connection between the new cable terminations at Teigen in Vestfold and Evje in Østfold in the second half of 2010, following the concession granted by NVE, with project representatives also indicating an intention to commence building works in the autumn. The works cover installation of up to three sets of 420 kV cables along a new 13 km route that bypasses Bastøy and includes associated onshore works at the new muffe (jointing) stations at Teigen and Evje.
Licence: Licence to construct a new 420 kV subsea cable over the Oslofjord between Teigen and Evje
In December 2009, Statnett submitted a licence application to the Norwegian Water Resources and Energy Directorate (NVE) for a new 420 kV subsea cable across the Oslofjord from Teigen to Evje, part of the Oslofjord (Teigen–Evje) interconnector route via Bastøy, seeking consent to construct this reinforcement of the existing transmission link.
Following the 2008 failures on the Teigen–Bastøy–Evje cables, Statnett planned a major repair campaign in spring 2009 that would require fully disconnecting the interconnector in order to complete the remaining fault rectification on the Bastøy route, work that had been delayed due to bad weather and limited specialist cable personnel.
After the summer 2008 cable faults on the Teigen–Bastøy–Evje Oslofjord interconnector, Statnett restored the link to service at about half of its normal capacity from late November 2008, allowing limited operation while postponing completion of the remaining repair work until the following spring.
In the summer of 2008, Statnett experienced faults on four of the six 420 kV cables forming the Teigen–Bastøy–Evje crossing over the Oslofjord, one of the two 420 kV interconnectors in the area, significantly reducing transfer capacity on this link and contributing to operational constraints.
In 2008, the combination of the hydrological resource situation and faults on the two 420 kV interconnectors over the Oslofjord, including the Teigen–Bastøy–Evje link, caused congestion on exports from South Norway, contributing to the South Norway spot price averaging 12 percent below the Nordic system price.
Licence: Notice to Mariners / submarine cable chart listing
The Teigen–Bastøy–Evje 420 kV submarine cable route over the Oslofjord was formally documented with detailed geographic coordinates in the Norwegian hydrographic publication Efs 13‑2006, referencing Statnett and nautical chart 10. This notice to mariners records the cable alignment between Teigen, Bastøy and Evje for navigational and charting purposes.
Authority: Norges vassdrags- og energidirektorat (NVE) · Licence: Concession for construction and operation of new 420 kV subsea cable connection between Teigen and Evje across the Oslofjord
Norges vassdrags- og energidirektorat (NVE) granted Statnett a concession to build and operate a new 420 kV subsea cable connection between a new cable sealing end station at Teigen in Vestfold and a new sealing end station at Evje in Østfold, across the Oslofjord. The consent covers up to three sets of 420 kV sea cables (nine cables in total) and enables replacement of the existing Teigen–Bastøya–Evje cable route, improving transmission capacity and security of supply in the Østland region.
| Norway | Norway | |
|---|---|---|
| Landfall | Bastøy Island, Horten, Vestfold, Norway | Evje, Østfold, Norway |
| Grid Connection | — | — |
Norway
Norway