Last year they used 14% more of the electricity supply.
Data centres consumed a third more electricity in 2021 compared to 2020.
CSO figures show that last year they used up 14 per cent of the metered electricity supply.
Since 2015 there has been an increase of 265 per cent in the power used by the centres.
Meanwhile, overall there was a 5 per cent increase in electricity consumption last year compared to the year before.
Dublin postal districts had the highest proportion at 18%, followed by Cork (12%), Dublin county (7%), Galway (6%) and Kildare (5%).
Social Democrats Energy Spokesperson Jennifer Whitmore commented: “The country has been convulsed in recent weeks by attempts to ban turf sales by the government.
"Meanwhile, the CSO informs us today that data centres are consuming more electricity in Ireland than every single rural dwelling combined.
“This stark statistic highlights a central problem of the government’s “see-no-evil, hear-no-evil’ efforts to reduce our carbon emissions.
"All of the responsibility to reduce emissions is put on the individual, while the State continues to facilitate and incentivise energy-guzzling industries," she said.

Sharp Rise In M9 Collisions With Garda Call-Outs Up Year-On-Year
Councillor Seeks Clarity On How Often Nightclubs and Late Bars In Naas Are Inspected For Fire Risks
New Figures From CSO Reveal How Much International Protection Applicants Earn Compared To Average Worker In Ireland
Unpaid Eight-Month Work And Training Placement For Adults With Disabilities Branded "Extremely Unfair"
Department Of Education Defends Kildare SNA Cuts Amid Claims Of Reduced Need At Some Schools
Naas Nurses Threaten Escalation As Staffing Row Deepens
Driving Tests Face Disruption As RSA Testers To Strike Next Week
Jury Delivers Not Guilty By Reason Of Insanity Verdict In Ballyfin Demesne Strangling Case