Survey work underway for Greenlink interconnector

25 September 2018

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Subsea field work for one of Europe's most important infrastructure projects, the Greenlink interconnector, commenced in late September with the launch of MMT's survey vessel, MV Franklin.

Subject to weather conditions, offshore and nearshore survey along the proposed route of the electricity link between the UK and Ireland is expected to take approximately 40 days. Further work along the 170km marine route will be undertaken by vessels MV Seabeam, MV Edda Fonn and RED7 Jack-up rig Seariser 2

The objective of the Greenlink Marine Survey (GMS) is to acquire all appropriate data to confirm the preferred route for the High Voltage Direct Current (HVDC) cable system. The survey area stretches between Freshwater West (Pembrokeshire, Wales) and Baginbun (Co. Wexford, Ireland).

The survey data will also contribute to the cable burial risk assessment and provide information for planning applications, ensuring that the final chosen route is sympathetic to the existing marine environment as well as being safe and economically sound.

MMT's work scope comprises an intertidal topographic survey, geophysical and hydrographic nearshore and offshore data acquisition, geotechnical investigations with vibro and piston coring, cone penetration testing (PCPT), environmental sampling and imagery, an infrastructure crossing survey using a remotely operated vehicle (ROV), UXO (unexploded ordnance) survey and geotechnical boreholes to inform horizontal directional drilling.

These operations will provide high resolution, accurate measurements of the bathymetry and seabed features and the shallow geological conditions along the route(s). This data will be supplemented by localised UXO and infrastructure crossing surveys and environmental sampling and imagery.

Greenlink is a proposed 500MW electrical underground and submarine interconnector, connecting the UK National Grid system at Pembroke substation in Pembrokeshire, Wales to the Irish network at Great Island substation in County Wexford, Ireland. The privately-financed €400 million project is being developed by Greenlink Interconnector Limited, a subsidiary of Element Power. The commencement of the GMS represents a significant milestone in the development of the project, in preparation for the start of construction scheduled for 2020.

MMT (UK) Ltd
2A Banbury Office Village
Noral Way
Banbury
Oxon OX16 2SB
UK
T: +44 1295 817740
F: +44 1295 259829
W: www.mmt.se

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