Undersea cable fault leaves inner islands without power for 28 hours

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Undersea cable fault leaves inner islands without power for 28 hours

Post  Sirop14 on Wed Aug 02, 2017 5:36 am

Undersea cable fault leaves inner islands without power for 28 hours

http://www.nation.sc/article.html?id=255073

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Public Utilities Corporation to install new undersea cables

Post  Sirop14 on Fri Sep 22, 2017 11:18 am

Thursday 21 September 2017
Power supply
Public Utilities Corporation to install new undersea cables
Depending on availability of financial resources PUC will, in the near future, install new undersea cables between Mahé and Cerf Island, and between Praslin and La Digue. As for the installation of underground cables as a measure to prevent power outages on Mahé, more elements are at play, say the authorities.
by S. Marivel
Following PUC’s announcement that they will be installing two additional generator sets at the Roche Caiman power station, and electric transmission cables around the entire island, TODAY enquired whether it would be more efficient to have underground cables on Mahé and new undersea cables linking the inner islands.
In response, PUC informed this newspaper that it is in their policy “...to install new transmission and distribution systems underground and to convert existing overhead networks to underground networks wherever practical and economical... and most of the new transmission and distribution projects are now being undertaken with underground cables.”
However in realistic terms, such a project is still not completely viable - especially for areas where underground installations are not yet possible.
“Where undergrounding is not possible we are using Aerial Bundled Cables (ABC) instead of bare conductors,” PUC explains, reasoning that these are less likely to cause power outages from trees falling onto electrical poles. They also add that Aerial Bundled Cables “have less visual impact and is more environmentally friendly.”
However, PUC confirms that “…depending on availability of financial resources, PUC will, in the near future, install new undersea cables between Mahé and Cerf Island and between Praslin and La Digue.”
When it comes to the environmental impact of overhead cables, Principal Secretary for the Energy and Climate Change Department Wills Agricole, confirms that having an “alternative solution of power transmission for Seychelles in the future” can help the situation “rather than using the traditional method”.
He does add that undersea cables may be efficient in curbing power outages and helping Seychelles become more environmentally friendly.
“But laying underwater cables does cause some disturbance of the ocean floor, even if within days the area tends to return to normal but there is still that risk of the undersea cable getting damaged,” he explains to TODAY.
“Hence a pre-feasibility study has to be conducted including a marine environment impact assessment,” he suggests, adding that “even then, exploring such underwater connections will be a plus for Seychelles as it will help in the efficient usage of electricity. At the same time it has as an advantage of connecting with distant renewable sources such as a solar farm on a remote island and/or other energy resources such as wind, geothermal, ocean energy etc.”
Mr. Agricole reasons that future renewable energy projects in the future can boost the use of undersea power cables and transnational grids to bring power lines below the waves as opposed to the traditional overhead power lines.
As a result, “the renewable sources will be more widely available, and would provide greater incentives for renewable energy investment in Seychelles, while at the same time preserving green spaces on the mainland.”

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