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A review of potential impacts of submarine power cables on the marine environment: Knowledge gaps, recommendations and future directions

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  • Taormina, Bastien
  • Bald, Juan
  • Want, Andrew
  • Thouzeau, Gérard
  • Lejart, Morgane
  • Desroy, Nicolas
  • Carlier, Antoine

Abstract

Submarine power cables (SPC) have been in use since the mid-19th century, but environmental concerns about them are much more recent. With the development of marine renewable energy technologies, it is vital to understand their potential impacts. The commissioning of SPC may temporarily or permanently impact the marine environment through habitat damage or loss, noise, chemical pollution, heat and electromagnetic field emissions, risk of entanglement, introduction of artificial substrates, and the creation of reserve effects. While growing numbers of scientific publications focus on impacts of the marine energy harnessing devices, data on impacts of associated power connections such as SPC are scarce and knowledge gaps persist. The present study (1) examines the different categories of potential ecological effects of SPC during installation, operation and decommissioning phases and hierarchizes these types of interactions according to their ecological relevance and existing scientific knowledge, (2) identifies the main knowledge gaps and needs for research, and (3) sets recommendations for better monitoring and mitigation of the most significant impacts. Overall, ecological impacts associated with SPC can be considered weak or moderate, although many uncertainties remain, particularly concerning electromagnetic effects.

Suggested Citation

  • Taormina, Bastien & Bald, Juan & Want, Andrew & Thouzeau, Gérard & Lejart, Morgane & Desroy, Nicolas & Carlier, Antoine, 2018. "A review of potential impacts of submarine power cables on the marine environment: Knowledge gaps, recommendations and future directions," Renewable and Sustainable Energy Reviews, Elsevier, vol. 96(C), pages 380-391.
    • Handle: RePEc:eee:rensus:v:96:y:2018:i:c:p:380-391
    DOI: 10.1016/j.rser.2018.07.026
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    3. Hutchison, Zoë L. & Gill, Andrew B. & Sigray, Peter & He, Haibo & King, John W., 2021. "A modelling evaluation of electromagnetic fields emitted by buried subsea power cables and encountered by marine animals: Considerations for marine renewable energy development," Renewable Energy, Elsevier, vol. 177(C), pages 72-81.
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    6. M. A. Clare & A. Lichtschlag & S. Paradis & N. L. M. Barlow, 2023. "Assessing the impact of the global subsea telecommunications network on sedimentary organic carbon stocks," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
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