Bornholm Cable

The Bornholm Cable is a submarine power cable under the Baltic Sea, connecting the power grid of the Danish island of Bornholm to the Swedish power grid owned by E.on with a capacity of 60 MW.[1] It is owned by Energinet[2], previously by Östkraft.[3]

There is an agreement between Svenska kraftnät and Energinet about balancing the Bornholm grid.[2]

Cable sections

The cable sections are:[4]

  • Hasle substation to Bornholm coast: 1.4 km underground, 400 mm2 conductors at 60 kV
  • Undersea section: 43.5 km, 240 mm2 conductors at 60 kV
  • Swedish coast to cable terminal: 700 m underground, 400 mm2 conductors at 60 kV
  • Cable terminal to Borrby substation: 4.2 km overhead line with 127 mm2 conductors at 60 kV
  • Borrby substation to Tomelilla substation: 132 kV line with two circuits

Outages

The undersea section is sometimes damaged, recently in 2004[5] , in 2010[6] and in 2013. [7] [8] [9]

In 2013 the damage cost half a million Danish crowns per day, due to differences in price of electricity between Bornholm and southern Sweden and to the costs for having two ships waiting for calm weather to be able to repair the cable.[7]

When the cable does not work, there is need to run the coal power plants on Bornholm. In order to produce electricity during the starting time of those plants, some diesel generators have been installed by Energinet.[6] There is also a project using electric vehicles as a storage for this period of some hours.[10]

In 2018 the cable was put deeper into the seabed in order to preent damages.[11]

References
  1. "Den felande länken - en manual i elektriska dröjsmål". Nordvästra Skånes Tidningar: 17. 2019-12-01. Retrieved 2020-01-11.
  2. SOU 2007:99 Förhandsprövning av nättariffer m.m. Ministry of Enterprise and Innovation (Sweden). 2007. Retrieved 2 June 2020.
  3. SOU 2001:73 Elnätsföretag - särskild förvaltning och regionnätstariffer. Ministry of Enterprise and Innovation (Sweden). 2001. Retrieved 2 June 2020.
  4. Østergaard, Jacob; Nielsen, John Eli (May 2010). "The Bornholm Power System - An overview" (PDF).
  5. "Kungörelse". Dagens Nyheter: 14. 2005-06-29.
  6. Godske Følg, Bjørn (12 January 2010). "Efter kabelbrud - Bornholm: Vi er verdensmestre i ø-drift". ing.dk. Retrieved 21 April 2020.
  7. "Bornholmskabeln lagad efter 49 dagar - Skuldfrågan ännu inte löst". Ystads Allehanda: 16. 2013-02-13.
  8. "Kabeln inte lagad än - Bornholm". Ystads Allehanda: 16. 2013-02-07.
  9. "Höga vågor försenar lagning av kabel - Skadad elledning till Bornholm". Ystads Allehanda: 18. 2013-01-15.
  10. Høm Jensen, Rikke (7 May 2019). "Afbrudt elkabel til Bornholm giver unik testmulighed". DTU. Retrieved 21 April 2020.
  11. "Søkablet til Bornholm spules ned i havbunden". Energy Supply. Sep 4, 2018.

See also
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