Irish and French grid operators mark commencement of Celtic Interconnector construction

// Commencement of works on the key strategic energy project was recognised, along with the signing of a Memorandum of Understanding //



November 21 - The chief executives of the Irish and French national electricity grids met recently to recognise the continued delivery of the Celtic Interconnector.

Developed by EirGrid and its French counterpart, Réseau de Transport d’Electricité (RTE), the Celtic Interconnector is a 700-megawatt high-voltage subsea power cable linking the electricity grids of Ireland and France. 

Construction works on the cable route from Knockraha, in east Cork have commenced on this strategic energy project, which, once delivered, will be able to import and export enough electricity to power 450,000 homes.

Xavier Piechaczyk, President of the managing board of French grid operator, Réseau de Transport d'Électricité (RTE), met with Mark Foley, Chief Executive of EirGrid to mark the latest milestone of the project and were joined by Agnès Pannier-Runacher, French Minister of Energy Transition and Eamon Ryan, Irish Minister for the Environment, Climate and Communications. 

The meeting also coincided with the signing of a new Memorandum of Understanding (MoU), which sets out aims to strengthen energy security, build on an affordable energy system and diversify energy supply in Europe, through joint cooperation between both transmission system operators (TSOs).

The ‘Cooperation on Offshore Energy Interconnection’ between EirGrid, and RTE, marks the deepening of the existing relationship between the two organisations and is a statement of shared ambition to work together on grid and system development perspectives to harness the potential abundant offshore renewable energy resources in the welfare and climate interest. 

The signing of the MoU signifies a joint cooperation between both TSOs in accordance with the European Union regulatory framework to improving security of supply, bringing diversification of energy sources, contributing to national energy targets, ambitions for renewable energy and creating new development opportunities for both Ireland’s and France’s economies.

More generally, this agreement reflects the ambition - supported by the work of the European Network of Transmission System Operators (ENTSO-E) to promote offshore projects across the Atlantic Ocean which brings together Ireland, Spain, Portugal and France - which could represent a capacity offshore wind production of 26 GW in 2040 and 54 GW in 2050. 

Welcoming the announcement of the signing, EirGrid chief executive, Mark Foley said: “To date, we have worked closely in partnership with RTE, as we deliver the Celtic Interconnector. The Celtic Interconnector is a key part in EirGrid’s strategic goal to transform Ireland’s power system and increase security of supply. 

Construction has commenced on the cable in both countries, and, when delivered, will make the power system more resilient and efficient.

We look forward to an increased partnership with RTE as we work towards achieving our climate ambitions by exploring our offshore potential, and further energy interconnection.”

RTE’s Xavier Piechaczyk said: “This partnership aims to strengthen the cooperation between Rte and EirGrid with regard to the planning and development of the energy generation and the offshore grid network, which will be one of the key pillars required for the fastest possible establishment of a decarbonised European electricity network to which the EU is committed.”




Notes to editors


  • The Government of Ireland’s Climate Action Plan 2023 sets out the connection of at least 5 GW of offshore wind capacity to Ireland’s electricity transmission grid by 2030, with an additional 2GW sought for green hydrogen production.
  • The Celtic Interconnector project will create an electrical interconnection between Ireland and France to allow the exchange of electricity between the two countries. The connection will link the existing electricity substation located in Knockraha (in east Cork) to the substation in La Martyre (Finistère, France).
  • The Celtic Interconnector project construction phase is underway and scheduled to complete in 2026.
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