Ireland – Construction work for electricity power lines – The MaresConnect 750MW HVDC Interconnector System — MaresConnect Limited (MCL) (IRL) · 1000000000 EUR

667588-2026 cor-buy 17 https://maresconnect.ie/ ORG-0001 MaresConnect Limited (MCL) The Victorians, 15-18 Earlsfort Terrace Dublin 2 D02 YX28 IE061 IRL 605488 Joseph Moneley +35319131245 procurement@maresconnect.ie https://www.find-court-tribunal.service.gov.uk/courts/royal-courts-of-justice ORG-0002 High Court of Justice of England and Wales, Royal Courts of Justice Strand London WC2A 2LL GBR n/a +44 20 7947 6000 https://op.europa.eu ORG-0000 Publications Office of the European Union Luxembourg 2417 LU000 LUX PUBL +352 29291 ted@publications.europa.eu 00673645-2026 189/2026 2026-09-30+02:00 2.3 eforms-sdk-1.14 c4caa4d6-bf55-42d9-9234-6a92547e6750 b2e4d9c7-5a31-4f86-8c0e-1a7b3d5e9f24 2026-09-29Z 07:55:06Z 01 32014L0025 cn-standard ENG https://maresconnect.ie/ electricity ORG-0001 ted-esen ORG-0000 epo-procurement-document 4 neg-w-call false The MaresConnect 750MW HVDC Interconnector System 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). works Lot combinations: bidders for LOT 1A are also required to bid for LOT 1B, and bidders for LOT 1B are also required to bid for LOT 1A. Bidders for LOT 2A are also required to bid for LOT 2B, and bidders for LOT 2B are also required to bid for LOT 2A. The procurement process in respect of each of the Lots may result in a single contract being awarded to the successful contractor in that Lot (i.e. a single EPC contract which encompasses all elements of the project in that Lot). Alternatively, a number of different contracts may be awarded to the (same) successful contractor in the Lot, each covering a specific element(s) of the project. By way of example, in Lots 1A and 1B, the successful EPC contractor may be awarded a specific Long Term Service Agreement. Similarly, in Lots 2A and 2B, the successful EPC contractor may be awarded a specific Inspection, Maintenance and Repair Contract. In all of the Lots, the successful EPC contractor may be awarded a specific early works contract(s), which may for example encompass Front End Engineering Design and/or civil and structural enabling works. MCL is not a regulated utility for the purposes of Irish/UK/EU procurement law, and this procurement is therefore not subject to such rules. MCL intends to voluntarily follow Irish procurement rules in part but fully reserves its right to deviate from those rules. The publication of this notice does not make MCL and/or this procurement subject to any procurement rules. Form of Contract: The contracts to be awarded for all lots will be based on the FIDIC Conditions of Contract for EPC/Turnkey Projects, Second Edition 2017 (the 'Silver Book'). The FIDIC Silver Book will be amended and supplemented by Particular Conditions (specific to each lot), which are included in the procurement documents. Risk Allocation: Tenderers are explicitly advised that, in line with the EPC/Turnkey (FIDIC Silver Book) model, the successful contractor for each lot will assume full responsibility for the design and execution of their respective works. Requests to participate: a 'request to participate' is made by submitting a completed Pre-Qualification Questionnaire by the stated deadline. Variant tenders: Variant tenders may be submitted; however, this is at MCL's sole discretion and will only be permitted where the form and content of such variant tender has been agreed in principle with MCL in advance. 1000000000 45231400 North County Dublin, Ireland IE061 IRL Denbighshire, Wales, United Kingdom GBR LOT-0001 allowed nyk false MCL-PROCUREMENT-DOCUMENTS non-restricted-document https://maresconnect.ie/ As set out in the procurement documents (amended FIDIC Silver Book and Particular Conditions for the lot). epo-procurement-document false none no performance The contract will be based on the FIDIC Conditions of Contract for EPC/Turnkey Projects, Second Edition 2017 (Silver Book), amended and supplemented by Particular Conditions specific to the lot, as included in the procurement documents. not-allowed quality Price is not the only award criterion and all criteria are stated in the Procurement Process documents. ORG-0001 https://eu1.aconex.com/hub/index.html ORG-0001 ORG-0002 ENG required false 2026-10-31Z 12:00:00Z false none none LOT 1A LOT 1A: EPC for HVDC Converter Stations This lot is for the design, engineering, procurement, manufacturing, construction, installation, commissioning, and testing of two (2) 750 MW, 320 kV VSC-based HVDC converter stations, one at each end of the interconnector, and the grid connection. The LOT 1A scope includes all civil works, AC-side switchyards, and auxiliary systems on a fixed-price, lump-sum turnkey (EPC) basis. This lot also includes the maintenance, repair and spares management of the two converter stations which will be contracted under separate terms and conditions provided to candidates as part of the Procurement Process. (If applicable) separate agreements for the Early Works Contracts for FEED and Enabling Civil Works: FEED - tender design of the two (2) 750 MW, 320 kV VSC-based HVDC converter stations; Civil and structural Enabling Works. works Bidders for LOT 1A are also required to bid for LOT 1B. 45232221 31170000 45251110 Onshore site near a substation in the North Dublin Area, Ireland. IE061 IRL Onshore site near the substation at Bodelwyddan, Denbighshire, Wales. GBR UNKNOWN 0 LOT-0002 allowed nyk false MCL-PROCUREMENT-DOCUMENTS non-restricted-document https://maresconnect.ie/ As set out in the procurement documents (amended FIDIC Silver Book and Particular Conditions for the lot). epo-procurement-document false none no performance The contract will be based on the FIDIC Conditions of Contract for EPC/Turnkey Projects, Second Edition 2017 (Silver Book), amended and supplemented by Particular Conditions specific to the lot, as included in the procurement documents. not-allowed quality The most economically advantageous tender in terms of the criteria stated in the specifications, in the invitation to tender or to negotiate or in the descriptive document. ORG-0001 https://eu1.aconex.com/hub/index.html ORG-0001 ORG-0002 ENG required false 2026-10-31Z 12:00:00Z false none none LOT 1B LOT 1B: EPC for Irish 400kV AC Tail Substation This lot is for the design, engineering, procurement, manufacturing, construction, installation, commissioning, and testing of one 400kV AC Tail Substation in Ireland, in the proximity of the Irish Converter Station. The LOT 1B scope includes a 400kV AC tail substation in the proximity of the converter station compound in Ireland. The scope includes all civil works, AC-side switchyards, and auxiliary systems on a fixed-price, lump-sum turnkey (EPC) basis. This lot also includes the maintenance, repair and spares management of the 400kV AC Tail Substation which will be contracted under separate terms and conditions provided to candidates as part of the Procurement Process. (If applicable) separate agreements for the Early Works Contracts for the FEED and Enabling Civil Works: FEED - tender design of the 400kV AC Tail Substation; Civil and structural Enabling Works. works Bidders for LOT 1B are also required to bid for LOT 1A. 45232220 31214000 45232221 31170000 31682540 Onshore site near a substation in the North Dublin Area, Ireland. IE061 IRL UNKNOWN 0 LOT-0003 allowed nyk false MCL-PROCUREMENT-DOCUMENTS non-restricted-document https://maresconnect.ie/ As set out in the procurement documents (amended FIDIC Silver Book and Particular Conditions for the lot). epo-procurement-document false none no performance The contract will be based on the FIDIC Conditions of Contract for EPC/Turnkey Projects, Second Edition 2017 (Silver Book), amended and supplemented by Particular Conditions specific to the lot, as included in the procurement documents. not-allowed quality Price is not the only award criterion and all criteria are stated only in the procurement documents. ORG-0001 https://eu1.aconex.com/hub/index.html ORG-0001 ORG-0002 ENG required false 2026-10-31Z 12:00:00Z false none none LOT 2A LOT 2A: EPC for the HVDC Subsea and Underground Cable System, and for the associated HVAC Underground Cable System This lot is for the design, engineering, procurement, manufacturing, installation, commissioning, and testing of the 320 kV HVDC cable system (symmetrical monopole) and the 400 kV AC cable system for the GB grid connection works. The scope includes route survey, subsea installation, burial, landfall works (e.g., HDD), and underground cable installation to connect to the converter stations (GB and Ireland) and onto the HVAC transmission system connection point in GB. This lot also includes the inspection, maintenance, repair and spares management of the HVDC and HVAC cable systems which will be contracted under separate terms and conditions provided to candidates as part of the Procurement Process. The contract is on a fixed-price, lump-sum, turnkey (EPC) basis. (If applicable) separate agreements for the Early Works Contracts for the FEED and Enabling Civil Works: FEED - tender design of the cable system; Civil and structural Enabling Works for the cable system. works Bidders for LOT 2A are also required to bid for LOT 2B. 45314310 31320000 Underground HVDC cable route and underground HVAC cable route between the Converter Station in Ireland and a substation in the North Dublin Area, Ireland. In Ireland the HVDC Onshore Cable System is circa 10km to 26km and the HVAC Onshore Cable System is circa 2km. IE061 IRL Subsea HVDC route (approx. 190 km) in the Irish Sea between landfalls in Ireland (near Dublin) and Wales (near Bodelwyddan). IEZZZ IRL Underground HVDC cable route and underground HVAC cable route between the Converter Station in Wales and the substation at Bodelwyddan, Denbighshire, Wales, and the UK sea area of the subsea route. In Wales the HVDC Onshore Cable System is circa 14km and the HVAC Onshore Cable System is circa 2km. GBR UNKNOWN 0 LOT-0004 allowed nyk false MCL-PROCUREMENT-DOCUMENTS non-restricted-document https://maresconnect.ie/ As set out in the procurement documents (amended FIDIC Silver Book and Particular Conditions for the lot). epo-procurement-document false none no performance The contract will be based on the FIDIC Conditions of Contract for EPC/Turnkey Projects, Second Edition 2017 (Silver Book), amended and supplemented by Particular Conditions specific to the lot, as included in the procurement documents. not-allowed quality Price is not the only award criterion and all criteria are stated only in the procurement documents. ORG-0001 https://eu1.aconex.com/hub/index.html ORG-0001 ORG-0002 ENG required false 2026-10-31Z 12:00:00Z false none none LOT 2B LOT 2B: EPC for the HVAC underground cable system in Ireland (Dublin) This lot is for the design, engineering, procurement, manufacturing, installation, commissioning, and testing of the 400 kV AC cable systems to connect the converter station in Ireland to the transmission system connection point. This lot also includes the inspection, maintenance, repair and spares management of the HVAC cable systems which will be contracted under separate terms and conditions provided to candidates as part of the Procurement Process. In Ireland the HVAC Onshore Cable System is circa 2km. (If applicable) separate agreements for the Early Works Contracts for the FEED and Enabling Civil Works: FEED - tender design of the cable system; Civil and structural Enabling Works for the cable system. works Bidders for LOT 2B are also required to bid for LOT 2A. 45314310 31320000 HVAC underground cable route between the Converter Station in Ireland and the transmission system connection point, North Dublin Area, Ireland. In Ireland the HVAC Onshore Cable System is circa 2km. IE061 IRL UNKNOWN 0

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