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 u...
Buyer
MaresConnect Limited (MCL)
Value
€1,000,000,000
Published
29 Sept 2026
Closes
31 Oct 2026
Procurement details
Source
TED (EU)
Country
Ireland (IE)
Procurement method
Selective
Category
Works
Contract starts
Not provided
Contract ends
Not provided
CPV classifications
45231400
Construction work for electricity power lines
45232221
Transformer substation
31170000
Transformers
45251110
Nuclear-power station construction work
45232220
Substation construction work
31214000
Switchgear
31682540
Substation equipment
45314310
Installation of cable laying
Lots
Lot LOT-0001 LOT 1A: EPC for HVDC Converter Stations
Value not provided
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-su...
Delivery: IE061 · Ireland, United Kingdom
Lot LOT-0002 LOT 1B: EPC for Irish 400kV AC Tail Substation
Value not provided
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 civi...
Delivery: IE061 · Ireland
Lot LOT-0003 LOT 2A: EPC for the HVDC Subsea and Underground Cable System, and for the associated HVAC Underground Cable System
Value not provided
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 co...
Delivery: IE061 · Ireland, IEZZZ · Ireland, United Kingdom
Lot LOT-0004 LOT 2B: EPC for the HVAC underground cable system in Ireland (Dublin)
Value not provided
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 contracte...
Delivery: IE061 · Ireland
Documents
Unlock document linkTED notice 667588-2026
29 Sept 2026
Tender notice · Web page
Procurement documents
Not provided
Bidding documents
TED notice 673645-2026
30 Sept 2026
Tender notice · Web page
TED notice 681481-2026
5 Oct 2026
Tender notice · Web page
Contains information from TED (Tenders Electronic Daily), © European Union, reused under CC BY 4.0.