Source: https://tendernation.io/opportunities/01a14062-fbf8-72f2-86bf-1c855a75562f/ireland-construction-work-for-electricity-power-lines-the-maresconnect-750mw Open for bids IE # Construction work for electricity power lines – The MaresConnect 750MW HVDC Interconnector System [MaresConnect Limited (MCL)](https://tendernation.io/buyers/maresconnect-limited-mcl) Estimated value €1,000,000,000 Published 5 Oct 2026 Deadline 12 days left 31 Oct 2026 ## About this tender The MaresConnect Project is a proposed 750 MW, 320 kV High Voltage Direct Current (HVDC) electricity interconnector linking Denbighshire, Wales and North County Dublin, Ireland. Developed by MaresConnect Limited, a joint venture between Foresight Group Holdings Ltd and Etchea Energy Nominees Ltd, the project will transmit electricity via approximately 240 km of subsea and underground cables between new converter stations on each side. It aims to enhance security of supply, market integration, and renewable energy utilisation between the Irish and GB grids. MaresConnect shall utilise Voltage Source Converter (VSC) technology and the configuration shall be a Symmetrical Monopole. The rated DC voltage shall be +/-320 kV. The link shall be bi-directional and shall have a rated power (receiving end) of 750 MW. The project is being procured as separate EPC (Turnkey) contracts, divided into four lots: LOT 1A: EPC for two HVDC Converter Stations; LOT 1B: EPC for one Irish 400kV AC Tail Substation; LOT 2A: EPC for the HVDC subsea and underground cable system, and for the HVAC underground cable system in Wales (Bodelwyddan); LOT 2B: EPC for the supply and installation of HVAC cable system in Ireland (Dublin). The contract model for the lots will be amended FIDIC Conditions of Contract for EPC/Turnkey Projects (Silver Book). MaresConnect has conducted Preliminary Market Engagement prior to publication of this Contract Notice and encourages further collaboration between OEMs and Construction Contractors to establish bidding arrangements in time for the next step of the Procurement Process (notably the Pre-Qualification Questionnaire). Read full description ## CPV classification Construction work for electricity power lines Transformer substation Substation construction work Installation of cable laying Transformers Nuclear-power station construction work Switchgear Substation equipment Power distribution cables Source Tenders Electronic Daily (EU) · Notice 681481-2026 [View official notice](https://ted.europa.eu/en/notice/681481-2026) Never miss a tender like this again Get AI summaries, deadline alerts and a bid pipeline for tenders matched to your business. Free to start. [Track tenders free](https://tendernation.io/register) [Buyer profile MaresConnect Limited (MCL): past awards and live tenders](https://tendernation.io/buyers/maresconnect-limited-mcl) [Sector More Construction work tenders](https://tendernation.io/sectors/construction-work) ## More tenders like this [Construction work for electricity power lines – The MaresConnect 750MW HVDC Interconnector System · MaresConnect Limited (MCL) · 12 days left · 31 Oct 2026](https://tendernation.io/opportunities/01a14064-6034-71af-b2b7-496c12348481/ireland-construction-work-for-electricity-power-lines-the-maresconnect-750mw) [Construction work for electricity power lines – The MaresConnect 750MW HVDC Interconnector System · MaresConnect Limited (MCL) · 12 days left · 31 Oct 2026](https://tendernation.io/opportunities/01a14064-4b65-735d-8b17-f558545dbdc5/ireland-construction-work-for-electricity-power-lines-the-maresconnect-750mw) [24/033 - Qualification System for the provision of Engineering, Procurement and Construction Services for South West Scotland Onshore System (SWSOS) · Gas Networks Ireland · 3319 days left · 20 Nov 2035](https://tendernation.io/opportunities/01a13bc7-f251-729e-84a1-c6c8df7ca96a/24033-qualification-system-for-the-provision-of-engineering-procurement-and) [Construction work – Restricted Procedure for the manufacture and laying of 2 x 33 kV Three-Core Submarine Power Cables with embedded FO cable between Malta and Gozo · Enemalta plc · 2 days left · 21 Oct 2026](https://tendernation.io/opportunities/01a14063-cb12-7367-84f7-369640d10c67/malta-construction-work-restricted-procedure-for-the-manufacture-and-laying) [Construction work – Multi-Party Framework Agreement for Civil Engineering Works at Dublin Port · Dublin Port Company\_411 · 24 days left · 12 Nov 2026](https://tendernation.io/opportunities/01a14210-5da8-70af-a7ac-a930e28e59ea/ireland-construction-work-multi-party-framework-agreement-for-civil-engineer) [Electricity distribution and control apparatus – 35HAV26 - Procurement of a cable management system (CMS) for Kneppeskjær · Oslo kommune v/ Oslo Havn KF · 14 days left · 2 Nov 2026](https://tendernation.io/opportunities/01a14062-dfdb-7083-96cf-c824e162da64/norway-electricity-distribution-and-control-apparatus-35hav26-procurement)