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 has been repeatedly damaged: in 2004,[5] in 2010[6] and in 2013.[7][8][9] The damage in 2013 cost half a million Danish crowns per day, due to electricity price differences between Bornholm and southern Sweden and the costs of two ships waiting for calm weather to repair the cable.[7]

Reserve generating capacity for when the cable is out of service is provided by coal power plants on Bornholm and by diesel generators to cover the start-up time of the coal plants.[6] There is also a project using energy stored in electric vehicles as a backup supply for a period of hours.[10]

In 2018 the cable was buried deeper in the seabed to prevent damage.[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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