The power produced by Sofia will be transmitted by offshore cables that arrive on land at a site between Redcar and Marske-by-the-Sea. Each offshore cable will connect to an onshore buried cable that will run seven kilometres to a new converter station to be constructed on a site adjacent to the Wilton Complex. Further buried cables will transport the power two kilometres from the converter station to the existing substation at Lackenby, where it will feed into the national grid. Onshore construction works began at the site of the converter station in June 2021, and onshore project-related activity will continue until early 2025.
Onshore converter station
Kier Infrastructure, contracted to GE's Grid Solutions, has been onsite since spring 2022 readying it for the installation of the converter station's state-of-the-art electrical infrastructure. Work is making visible leaps forward with the framework for the valve hall and control building now standing tall. There are ongoing concrete pours for the foundations for the electrical equipment that is to come, plus drainage installation and cable ducting to connect all the electrical equipment to the control building.
Sofia is keen to minimise disruption to those living nearest the site and part of this has involved re-shaping the northern of two mounds that separate the converter stations’ site from Lazenby Village. As well as being reshaped, it has also been planted with trees, shrubs and wildflowers. The second phase of reshaping, on the southern mound, is now underway. The reshaped mounds will be an improved barrier to the construction activity and will visually screen the two new converter stations and the Wilton International site.
400kV AC cable route
A second GE contractor, VolkerInfra is also now onsite and has stripped the topsoil and begun duct installation for the two-kilometre 400kV AC cable route from the converter station to the National Grid substation at Lackenby.
Cable route
The onshore civil engineering work for the export cable route is also now well underway. J. Murphy & Sons Ltd. has completed the topsoil strip, excavation for trenching and most of the duct installation in readiness for the project’s export cables to be pulled through. There is one section of the cable corridor, under the railway bridge, where tunnelling will be used. That work is set to take place in spring/summer 2023.
Regular drone surveys of the converter station and both cable corridors will be carried out throughout the works to monitor progress.
Landfall
At the landfall the teams are working on the one-kilometre horizontal directional drills from the construction compound opposite the beach near Marske-by-the-Sea, Teesside. Drilling work was on hold over winter but the site remobilises for the final drills to take place between March and May 2023.
Start of enabling works to prepare for the construction of the converter station.
Start of work on the mounds on-site - to increase the screening of the converter station site from the village of Lazenby.
Enabling works completed at the converter station site.
Work at the existing National Grid Lackenby Substation begins.
Construction of Sofia’s onshore converter station begins.
Start of works along the cable corridor from landfall to Lackenby Substation. Trenching and duct laying underway.
Start of two years construction activity at the landfall between Redcar and Marske-by-the-Sea, including horizontal directional drill under the beach to lay ducts for the offshore cable.
Start of work to install the export cables from shore to the converter station.
Installation of AC cables from the converter station site to the National Grid substation.
Completion of construction works at the landfall site.
Completion of the installation of cables from shore to the converter station.
Sofia connected to the national grid. All work, including reinstatement, completed along the cable corridor between the converter station and substation, and at the substation itself.
Onshore converter station construction completed.
Completion of the mounds screening the converter stations.
Completion of reinstatement of cable corridor from shore to the converter station site.
All relevant plans relating to the project's onshore construction, including Design, Landscape, Fencing and Drainage, will be submitted to Redcar & Cleveland Borough Council for approval prior to work starting. The button below takes you to a list of all the available documents and their reference numbers so you can find them in the Planning Register of the Council website.
| CONTRACTOR | DESCRIPTION | WEBSITE |
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Starting onsite in 2022, GE's Grid Solutions will be responsible for the construction of the onshore converter station. |
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Prysmian Group will design, supply, install and commission Sofia's HVDC export link including 15km of onshore cables and installation work. |
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Jones Bros Civil Engineering UK will deliver the enabling works package for the onshore converter station platforms for both Sofia and Dogger Bank C. |
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Kier is carrying out the onshore converter station civils construction package on behalf of GE's Grid Solutions. |
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VolkerInfra will design, supply and install the 400kV AC cable between Sofia's onshore converter station and National Grid's Lackenby Substation. |
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BakerHicks will design the Sofia onshore converter station and carry out related activities. |
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J. Murphy & Sons will design and deliver the onshore export cable civil works in relation to both Sofia and neighbouring project Dogger Bank C. |
