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Marine survey work starts for Greenlink interconnector

The subsea field work for the Greenlink interconnector, one of Europe’s most important
infrastructure projects, gets under way today with the launch of the first of MMT’s survey
vessels, MV Franklin, from Pembroke Dock in Wales. The offshore and nearshore surveying
along the proposed route of the electricity link between the UK and Ireland is expected to take
approximately 40 days, depending on weather conditions. MMT were awarded the contract for
the Greenlink Marine Survey (GMS) by Greenlink Interconnector Ltd in August.

Further survey work along the 170km marine route will be undertaken by vessels MV Seabeam,
MV Edda Fonn and RED7 Jack-up rig Seariser 2. The survey area is between Freshwater West,
Pembroke, Wales and Baginbun, Co Wexford, Ireland. A Notice to Mariners has been issued for
the area.

The objective of the GMS is to acquire all appropriate data for the confirmation of a preferred
route for the High Voltage Direct Current (HVDC) cable system. The surveys will also contribute
to the cable burial risk assessment and provide information for the planning applications,
ensuring that the final route selected is designed sympathetically to the existing marine
environment.

Simon Ludlam, Project Director for Greenlink said;

“We are delighted to have appointed the expertise of MMT to undertake the marine survey
work for Greenlink. This will collect vital data for the project development and planning
applications, helping us determine the best route between Pembrokeshire and Co. Wexford from
an environmental, health and safety and economic point of view. The launch of the surveying
work today is a significant step in the development of this important electricity infrastructure
project.”

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’s geophysical marine survey work comprises intertidal topographic survey, geophysical /
hydrographic nearshore and offshore data acquisition, geotechnical investigations with
vibrocoring / piston coring and cone penetration testing (PCPT), environmental sampling and
imagery, infrastructure crossing survey with ROV, UXO survey, and geotechnical boreholes to
inform horizontal directional drilling.

These operations shall provide high resolution and accurate measurements of the bathymetry
and seabed features and the shallow geological conditions along the route(s). This will be
supplemented by localized unexploded ordnance (UXO) surveys, environmental sampling and
imagery as well as surveys of infrastructure crossings using an ROV.


Media contact details:

For MMT:
Nils Ingvarson, CCO: nils.ingvarson@mmt.se Tel: +46 708 14 37 16
P-O Sverlinger, CEO: p-o.sverlinger@mmt.se Tel: +46 703 18 68 94


For Greenlink Interconnector Limited:
Anna Stanford, Communications Manager: anna.stanford@elpower.com Tel: +44 7961 234634


Notes to editors:

Image with caption, © all rights reserved to MMT


About Greenlink:

Greenlink is a proposed 500MW, 205km subsea and underground high voltage direct current (HVDC)
interconnector (with associated converter stations) between the existing electricity grids in Ireland and the UK,
operated respectively by EirGrid and National Grid Electricity Transmission. It is being developed by Greenlink
Interconnector Limited, a subsidiary of Element Power, and is due to commence construction in 2020. The project
will link the Great Island transmission substation in County Wexford (Ireland) and Pembroke transmission
substation in Pembrokeshire (Wales). Greenlink has been recognised as a Project of Common Interest (PCI) by the
European Union following support received from both the Irish and UK governments. It has also received funding
from the European Commission through the Connecting Europe Facility. More details at:
www.greenlinkinterconnector.eu and www.elpower.com


About MMT:

Specialising in high resolution subsea surveys, MMT is the solution to your marine surveying needs. We collect,
process and visualise the conditions of the seabed. We offer assured surveys in bathymetric, geophysical and
geotechnical services, specialising in the oil & gas, hydrography and renewable energy & marine cable sectors. Our
competence and services will supply you with the relevant information, designed to fit your planning processes of
your offshore infrastructure projects.