North Sea Link | Mitsubishi Electric Europe.


ACS was appointed as a subcontractor on the Blyth North Sea Link project, building the world’s longest subsea electricity interconnector for National Grid Electric. Developing its relationship with Mitsubishi Electric Europe, the principal contractor of the project, ACS constructed all civil works to the new 400 KV GIS substation at Blyth which is an extension to the existing substation.


The scope of the works includes:


  • The construction of a platform consisting of 300mm thick compacted granular fill to MOT Type 3- and 75-mm site wide stone chippings including associated earthworks
  • A flexible access road which will branch from the existing access road to the north west of the site to the new substation
  • Underground cable ducts, troughs and draw pits will be installed to link the new substation works into the existing infrastructure
  • A precast concrete cable trench where cables extend from the extended substation level down a slope to the existing substation at low level
  • Upgrade external lighting and connection to existing cables and ducts
  • A reinforced concrete ground bearing slab for a portable SF6 decontamination unit to be provided by others
  • Reinforced concrete North Sea cable sealing end-pit to accept cable from the new convertor station
  • The provision of new drainage including manholes, catch pits and connection to the existing drainage system


We developed a proactive working relationship with Mitsubishi Electric Europe, operating in close coordination to ensure the successful delivery of this challenging project. Along with Mitsubishi Electric Europe, we developed close partnerships with the other key stakeholders on the project including National Grid, the design teams and the other construction/M&E teams.