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    ContractsIreland-Wales 750MW HVDC Electricity Interconnector - Construction Work Contracts
    Open tender

    Ireland-Wales 750MW HVDC Electricity Interconnector - Construction Work Contracts

    Contract value
    €1bn
    Published 5 Oct 2026

    MaresConnect seeks EPC contractors for construction and installation of a 750MW electricity interconnector linking Wales and Ireland via subsea and underground cable systems.

    🇮🇪IrelandPublished 5 Oct 2026· TodayviaTED
    Contract value
    €1bn
    Published 5 Oct 2026

    Decision brief

    4 fields
    • Contract value
      est.€1,000,000,000
      Euros
    • Closing date
      Rolling
      No closing date published
    • Sector
      Construction
      Browse related listings
    • Location
      🇮🇪Ireland

    Lifecycle

    Open

    Open tender — no closing date published. Opened today.

    5 October 2026
    Open tender · no closing date published

    Brief

    The MaresConnect Project is a major infrastructure initiative to build a 750 MW, 320 kV High Voltage Direct Current (HVDC) electricity interconnector connecting Denbighshire, Wales to North County Dublin, Ireland. The system will transmit electricity through approximately 240 km of subsea and underground cables using Voltage Source Converter (VSC) technology in a Symmetrical Monopole configuration. The bi-directional link aims to improve electricity supply security, enhance market integration, and support renewable energy utilization between the Irish and GB power grids. The project is being procured through four separate Engineering, Procurement, and Construction (EPC) turnkey contracts: LOT 1A covers two HVDC Converter Stations; LOT 1B covers one Irish 400kV AC Tail Substation; LOT 2A covers HVDC subsea and underground cables plus HVAC underground cables in Wales; and LOT 2B covers HVAC cable supply and installation in Ireland. Contracts will use amended FIDIC Conditions of Contract for EPC/Turnkey Projects (Silver Book). Preliminary market engagement has been completed, and MaresConnect encourages collaboration between Original Equipment Manufacturers (OEMs) and Construction Contractors to establish bidding partnerships ahead of the Pre-Qualification Questionnaire stage.

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    View tender on sourceTED

    Full notice and submission process on the publisher's site

    Publisher
    Publications Office of the European Union
    Licence
    EU 2011/833/EU + TED reuse notice
    Source
    ted.europa.eu
    Record ID
    681481-2026
    MM
    Buyer
    MaresConnect Limited (MCL)
    Sector
    Construction