RTE issues Celtic interconnector tender notice
de Transport d’Electricité (RTE) has issued a tender notice for integrated
nearshore surveys for the Celtic
subsea cable interconnector project. The services requested include geophysical,
unexploded ordnance (UXO) and geotechnical surveys to be performed at the
French landfall of the interconnector, mainly in water depths ranging 0-30
The geophysical investigation is to include both surface and subsurface
survey (sub-bottom profiling). The purpose of the UXO survey is to ensure
a risk of UXOs that is as low as reasonably practicable at the location
to be investigated during the geotechnical survey. The requirement for
this survey is to be confirmed.
Deep geotechnical ground truthing will be performed nearshore to characterise
the materials which would be drilled during cable installation works by
the means of horizontal directional drilling (or equivalent trenchless
technique). Both surface drilling (with or without piggyback seabed frame)
from a stable and waves uncoupled platform such as dynamic positioned vessel,
jack-up or heave suitable wave compensated rig and remotely operated drilling
can be considered.
The tender also includes the collection of quality samples of soil and
rock from nearshore locations, to be tested for the determination of physical
and mechanical properties and to support the interpretation of the geophysical
data. RTE stated this will include 30 metre depth drillings.
Interconnector will provide the first direct link between Ireland’s electricity
network and mainland Europe. When built, the interconnector is expected
to consist of around 600 km of cabling, which will run along the seabed
between France and Ireland. The cable will have the capacity to transmit
up to 700 MW of electricity, the equivalent of supplying power to around
450,000 homes, and also provide a direct fibre optic communications link
between Ireland and France. It is being developed by RTE and EirGrid, and
was designated a Project of Common Interest by the European Commission.
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