COMHAIRLE CONTAE ÁTHA CLIATH THEAS
SOUTH DUBLIN COUNTY COUNCIL

South Dublin County Council Crest

MEETING OF SOUTH DUBLIN COUNTY COUNCIL

Monday, December 08, 2025

QUESTION NO. 13

QUESTION: Councillor E. Ó Broin

To ask the Chief Executive if he has carried out any work to explore the possibility of utilizing deep geothermal energy, i.e. >3KM underground, in the county?

REPLY:

The Council's energy agency Codema and TU Dublin are partners in an EU Project called the GEMINI Project. Campus locations at both Grangegorman and Tallaght are sites where preliminary investigative bores have been drilled to approximately 1km depth. Both yeilded good temperatures, the Grangegorman borehole had 38degC at 1km depth for example. In Grangegorman the GEMINI project will look to cover the cost of drilling a production borehole to approximately 3km depth which is estimated to have heat available at circa 80degC. Geological Survey Ireland GSI are also planning to undertake seismic reflection surveys for mapping the subsurface in the Dublin area to highlight the best locations for potential drilling of production wells in the future. Geothermal Investigations