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The connection

Celtic Interconnector,
Connecting the electricity grids
of Ireland and France

The Celtic Interconnector project aims to create an electrical interconnection between France and Ireland to allow the exchange of electricity between the two countries. It is being developed by EirGrid, the electricity transmission system operator in Ireland, and its French counterpart, RTE (Réseau de Transport d’Électricité).

The connection will link the electricity substation located in Knockraha (in East Cork, Ireland) to the substation in La Martyre (Finistère). Recognised as a Project of Common Interest (PCI) by the European Union, the Celtic Interconnector project responds to European challenges regarding energy transition and addresses climate change by facilitating progress towards a low-carbon electricity mix. It will contribute to more secure, more sustainable and better priced electricity.

An electrical connection
in the Celtic sea

The Celtic Interconnector project consists of a 575 km high voltage direct and alternating current connection between the French (La Martyre) and Irish (East Cork) electrical networks.


Environmental considerations

EirGrid and Réseau de Transport d’Électricité (RTE) are committed to protecting and respecting communities and the environment affected by the interconnector both at sea and on land. They are also committed to preserving the natural environment. EirGrid and RTE have appointed specialist firms to carry out specific environmental analyses, including ecological assessments, for the future connection and the converter stations. EirGrid and RTE are working with stakeholders and associations in affected areas to carry out these environmental studies which will provide clarification on the project and assist with the development of a specific route while protecting the biodiversity and any areas of environmental concern. Environmental issues identified during the studies will be the subject of careful consideration. Mitigation measures such as avoidance, reduction and compensation measures will be specified to further reduce any environmental impacts.

Project schedule

To find out more about the consultation
in France and in Ireland

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