Celtic Interconnector: How's It Progressing in 2024?

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The Republic of Ireland and France united by a thin blue cable with electricity signals over it

The Celtic Interconnector is said to make Irish electricity cheaper and easier to transport to the island. It's been an ongoing process for a number of years now but it's at last getting closer to a reality. So will Celtic Interconnector be good for Ireland? Read our full Celtic Interconnector guide to find out more!


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What Is the Celtic Interconnector?

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The Celtic Interconnector is a proposed electricity and optic fibre cable connection between France and Ireland. The subsea cable of approximately 500 km in length and 75 km of on-land cable would run between a connection point in the south of Ireland to Brittany in the north-west coast of France.

Brittany is a cultural region and the traditional homeland of the Celtic Breton people and is recognised as one of the six Celtic nations. Hence the names “Celtic Interconnector” and "Celtic Link".

How Did the Celtic Interconnector Eirgrid Project Start?

electricity bill

Research into the feasibility of the Celtic Interconnector has been ongoing long before Brexit was even on the table. Eirgrid reported on the possibility of the interconnector as early as 2009 in their “Interconnection Economic Feasibility” report.

The report mainly focused on the economic benefits such a connection might bring, and the different scenarios which would have an effect on the project, as well as how energy prices might be affected. The results of the investigation carried out in the report were favourable and further research into detailed costs of such a project was called for.

The case was also put forward for Ireland being able to export wind-powered renewable energy to Europe when its renewable energy infrastructure is further developed. The project is now a joint venture between Eirgrid and RTE (le Réseau de Transport d'Électricité, the French equivalent of Eirgrid).

Eirgrid and RTE are responsible for the operation, maintenance and development of the electricity transmission infrastructure in Ireland and France respectively.

What Are the Stages of the Celtic Interconnector Project?

The Celtic Interconnector Eirgrid project is progressing at an accelerated pace, as most projects marked of common interest do. The initial planning allowed for the following phases:

  1. 2014-2016: Feasibility studies
  2. 2017-2018: Initial design and pre-consultation
  3. 2019-2021: Detailed design, consultations, and planning the Celtic Interconnector route
  4. 2022-2026: Construction

What's the Plan for the Celtic Interconnector Project in 2022?

image of globe held above open palms

As we enter 2022, the Celtic Interconnector gains in pace and commences the construction phase. The Eirgrid group has stepped up their updates regarding the progress of the project, posting short reports frequently on their “What’s happening now?” page.

The Celtic Interconnector project is so far going as planned, with members of the Eirgrid Celtic Interconnector team meeting stakeholders to cover any questions in both Cork and Youghal in March. EirGrid is currently awaiting further decisions from An Bord Pleanála regarding the development of the on-shore section of the Celtic Interconnector, along with other similar such application and licence results.

How Much Will the Celtic Interconnector Cost to Build?

As of 25 April 2019, financing was secured for the project. With a cost of nearly €930 million euros, the Celtic Interconnector will be mainly funded by the EU, who are likely to shell out for around 60% of the bill, with France offering to pay 35%. This means that Ireland itself will make very little in terms of direct contributions (outside of the standard EU membership expectations), yet will reap many benefits when the project concludes.


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What Are the Possible Advantages of the Celtic Interconnector?

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Although a massive undertaking requiring extensive funding, the Celtic Interconnector could provide sizeable benefits such as:

  1. Provide a more secure energy supply, as France would be Ireland’s only EU source of electricity after the UK exits the European Union.
  2. Being able to import and export more electricity - up to 700MW, enough to power around 450,000 homes and also farms.
  3. Drive down electricity prices in Ireland for consumers and reduce power outages.

Also of interest is the fact that fibre optic cable will be laid along with electric cables, physically connecting Ireland to Europe’s internet resources while potentially leading to an increase in internet speeds and more diverse broadband plans. One of the most important points in our opinion is the possibility of lowering energy prices in Ireland, by increasing competition and enabling easier access to our electricity market.

In the table below, you can see the cheapest electricity offer per Irish supplier.

Cheapest Electricity Offer per Supplier


Best Offer

Estimated Annual Bill

Trustpilot Reviews


31% Selectra Discount 📞


4.1 / 5

Yuno Energy

Fixed Discount


3.5 / 5


No Discount


4.0 / 5

SSE Airtricity

Fixed Offer


1.3 / 5

Bord Gáis

22% on Electricity


1.7 / 5

Electric Ireland

5.5% or 8.5% on DF


1.3 / 5


No Discount



Community Power

No Discount




No Discount


4.8 / 5


No Discount


3.9 / 5


No Discount


4.6 / 5





*Figures are for illustrative purposes only. Calculations based on average consumption figures for an urban home with a 24-hour standard meter unless specified. All discounts and cashback have been applied. This also includes the PSO Levy at €0.00.
Last updated: February 2024

How Will the Project Brexit-Proof Irish Electricity?

The EU’s stake in this is also somewhat strategic: by rescuing Ireland from geographical isolation following Brexit and additionally strengthening the Celtic link, the EU will be strengthening its ties with Europe as well as gaining access to the potential for renewable energy generation in Ireland. The French grid is already interconnected with Belgium, Great Britain, Italy, Spain and Switzerland.

Access to the massive European power market through France would mean Ireland would no longer be dependent on its UK electricity connections. It remains to be seen what will be done about our gas supply (which is managed by Gas Networks Ireland), although gas use should be phased out or replaced in keeping with our international commitments to lowering our carbon footprint and greenhouse gas emissions.

Will France See Any Benefit?

The Celtic Interconnector project has been earmarked a project of common interest by the EU, improving the movement and distribution of energy around Europe. Better interconnection means that surplus generated energy can be diverted from one country to another where there is a lack.

In fact, one of the motivations behind its construction is so that France can tap into the green energy potential that Ireland could generate, mainly its capacity for wind-powered renewable energy. Given Ireland’s abysmal progress towards its Paris agreement targets, this will hopefully translate to a renewed impetus, and more pressure on the responsible parties, to increase our wind power capabilities.


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What Are the Possible Disadvantages of the Celtic Interconnector?

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A public consultation was launched in France to discuss any concerns raised regarding laying the high-voltage cables. Some thorny issues have arisen over the environmental impact, including worries about how the physical line and electrical currents may affect sea life, and the potential risks should the cable deteriorate.

EirGrid and Réseau de Transport d’Électricité have several teams in place to monitor environmental effects such as habitat loss and/or deterioration, water pollution, and disturbance or displacement of protected species in order to minimise any negative impact. Both of these firms have also pledged to engage with offsetting in order to reverse any harm caused, and to help flora, fauna, and water quality improve again. This was a particular focus in the pre-2022 construction planning phase.

The shortlisted locations for the where the Celtic Interconnector route will make landfall (where the cable will surface) locations are:

  1. Ballinwilling strand
  2. Claycastle Beach
  3. Redbarn Beach

A substation site connecting the locations of Knockraha in County Cork to the La Martyre substation in Finistère - France has recently been confirmed, a distance of roughly 357 miles.

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How Do I Contact Eirgrid Regarding the Celtic Interconnector?

If you have questions to ask, views to be shared, or simply wish to request information on the Celtic Interconnector, Eirgrid have made the following methods of contact available to the general Irish public. You can also read through the many documents, studies and analyses provided by Eirgrid. The CRU, Ireland’s energy watchdog (formerly the CER), have also published various information papers and responses regarding the Celtic Interconnector. ESB networks has also been involved.

For Queries in Writing
The Celtic Interconnector Eirgrid Project Manager
EirGrid plc.
The Oval
160 Shelbourne Road
Dublin 4.

For Queries via Telephone
Michelle Walsh (CI Liaison Officer): +353 (0)85 870 4999
Eoghan O'Sullivan (Community Liaison Officer): +353 (0)87 247 7732
Eirgrid Customer Relations: +353 (0)1 237 0472

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