MaresConnect 750 MW HVDC interconnector system

Summary

The tender concerns the MaresConnect project, a 750 MW HVDC interconnector system linking Ireland and Great Britain. The project comprises four EPC/Turnkey lots: LOT 1A for two HVDC converter stations; LOT 1B for the Irish 400 kV AC Tail Substation; LOT 2A for the HVDC subsea and HVAC underground cable system; LOT 2B for the HVAC underground cable system in Ireland. The contract is to be executed on a fixed-price, lump-sum EPC basis and will be based on the FIDIC Silver Book, with lot-specific Particular Conditions. The procurement documents set multiple award criteria; price is not the sole criterion. The estimated total contract value is around EUR 1,000,000,000. The deadline for submission is 31 October 2026 at 12:00 UTC. Realization locations include North County Dublin, Ireland, and Denbighshire, Wales (UK). The contracting parties include MaresConnect Limited, the High Court of Justice of England and Wales, Royal Courts of Justice, and the Publications Office of the European Union. The procurement is conducted under a negotiated call for competition with the possibility of variant tenders; tender guarantees are not required.