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How much of Ireland's data-centre electricity does Amazon use?

Amazon's nine EPA-licensed Irish data-centre sites drew about 3.72 TWh from the grid in 2025, equal to 49% of the CSO's 7.7 TWh for all data centres. Because the two figures come from different sources, read it as a ceiling: roughly 40–50% (EPA annual environmental reports; CSO, Jul 2026).

By StackPath · published 3 October 2026 · updated 10 October 2026 · how we know · corrections

Who uses the most data-centre electricity in Ireland?

Sixteen data-centre sites with EPA generator licences file annual environmental reports, which include metered grid electricity. Together they drew 776 MW on average in 2025, 89% of the CSO's national data-centre total. By company:

OperatorAverage MWTWhShare of CSO total
Amazon (AWS)424.73.7248.5%
Microsoft154.51.3517.7%
Meta1351.1815.4%
Google260.233%
Equinix18.50.162.1%
K2 Strategic17.50.152%

Grid electricity from EPA AERs (GJ ÷ 3,600 = GWh). Share = company MW ÷ CSO national average MW (875 MW). Sites without an EPA licence are not in this table.

Figure 1

Who uses Ireland's data-centre electricity

Amazon (AWS) alone drew about 49% of all data-centre electricity in 2025; the sites that report to the EPA account for 89%.

Data-centre electricity by operatorNational average data-centre draw 874.8 MW (2025). Amazon (AWS) 424.7 MW (49%), Microsoft 154.5 MW (18%), Meta 135.0 MW (15%), Google 26.0 MW (3%), Equinix 18.5 MW (2%), K2 Strategic 17.5 MW (2%); not in EPA reports 98.6 MW.AVERAGE GRID DRAW, 2025 · 100% = 875 MW (CSO)Amazon (AWS): 424.7 MW, 48.5% of the national averageMicrosoft: 154.5 MW, 17.7% of the national averageMeta: 135.0 MW, 15.4% of the national averageGoogle: 26.0 MW, 3.0% of the national averageEquinix: 18.5 MW, 2.1% of the national averageK2 Strategic: 17.5 MW, 2.0% of the national averageNot in EPA reports: 98.6 MW, 11.3% of the national averageAmazon (AWS)49% · 425 MWMicrosoft18% · 155 MWMeta15% · 135 MWGoogle 3% · 26.0 MWEquinix 2% · 18.5 MWK2 Strategic 2% · 17.5 MWNot in EPA reports 11% · 98.6 MW
Data-centre electricity by operatorNational average data-centre draw 874.8 MW (2025). Amazon (AWS) 424.7 MW (49%), Microsoft 154.5 MW (18%), Meta 135.0 MW (15%), Google 26.0 MW (3%), Equinix 18.5 MW (2%), K2 Strategic 17.5 MW (2%); not in EPA reports 98.6 MW.AVERAGE GRID DRAW, 2025 · 100% = 875 MW (CSO)Amazon (AWS): 424.7 MW, 48.5% of the national averageMicrosoft: 154.5 MW, 17.7% of the national averageMeta: 135.0 MW, 15.4% of the national averageGoogle: 26.0 MW, 3.0% of the national averageEquinix: 18.5 MW, 2.1% of the national averageK2 Strategic: 17.5 MW, 2.0% of the national averageNot in EPA reports: 98.6 MW, 11.3% of the national averageAmazon (AWS): 49% · 424.7 MWMicrosoft: 18% · 154.5 MWMeta: 15% · 135.0 MWGoogle: 3% · 26.0 MWEquinix: 2% · 18.5 MWK2 Strategic: 2% · 17.5 MWNot in EPA reports: 11% · 98.6 MW

The bar is the national average data-centre draw in 2025: the CSO's 7,662 GWh divided by 8,760 hours, 875 MW. Each operator's slice is the sum of the average grid draw its EPA-licensed campuses reported for 2025. Only campuses with at least 50 MW thermal of on-site generators file these reports, so smaller sites and colocation halls sit in the light "not in EPA reports" slice. The two sources use different meters and scopes, so read the operator shares as close approximations, not exact percentages.

EstimateOperator shares divide EPA-reported draw by the CSO national average (StackPath, 3 Oct 2026).

Sources: EPA annual environmental reports, 2025, 3 Oct 2026 · CSO MEC02, 7 Jul 2026

Amazon data centre locations in Ireland

Our directory lists 9 Amazon (AWS) campuses, 9 of them operating. Nine of them file EPA reports:

CampusCouncilStatusAverage grid MW, 2025
Amazon (AWS) ClonshaughDublin Cityoperating144.4
Amazon (AWS) CruiserathFingaloperating76.6
Amazon (AWS) Grange Castle SouthSouth Dublinoperating61
Amazon (AWS) BlanchardstownFingaloperating49.8
Amazon (AWS) Belgard, TallaghtSouth Dublinoperating45.6
Amazon (AWS) Greenhills Road, TallaghtSouth Dublinoperating34.6
Amazon (AWS) DroghedaMeathoperating12.7
Amazon (AWS) CitywestSouth Dublin (nearest record)operating—
Amazon (AWS) LeixlipKildareoperating—

How big is that?

About 3.72 TWh is 11% of all metered electricity in Ireland (32,987 GWh in 2025, CSO). It is 41% of what every Irish home used combined (9,075 GWh).

The single biggest campus by grid draw is Microsoft's at Grange Castle. The biggest single site under one licence is Meta's at Clonee. But no other company comes close to Amazon's total, which is spread over campuses in Dublin City, Fingal, South Dublin, Meath, Kildare.

Amazon has announced 334 MW of Irish renewable power purchase agreements across 4 deals (company announcements). Those are wind and solar capacities. They produce far less on average than their rated MW, so they do not match a 425 MW average draw.

Why read it as a ceiling, not a measurement

The share divides one source by another. The EPA figures are metered and were re-read from every report; there is no double counting. The CSO finds data-centre meters by search and judgement, and says it may miss small or new sites. If it misses some, the national total is too low and Amazon's share too high.

Taken at face value, the figures leave only about 99 MW for every other data centre in Ireland. That is low but possible, because several large sites without EPA reports run partly on their own gas, which the CSO does not see. If the rest of the sector really draws 150–300 MW, Amazon's share falls to about 46–39%.

Why it matters

Most coverage talks about "data centres" as one sector. In February 2026 The Irish Times described one large site's use as "an unknown amount". Site-level grid use is in public EPA filings.

Our reading. One company's expansion plans move roughly a tenth of national electricity demand. That makes Amazon's decisions, its contracted capacity and its renewables deals a matter of national energy planning, not only of local planning.

Questions people ask

How many data centres does Amazon have in Ireland?
Our directory lists 9 Amazon (AWS) campuses in Ireland, 9 operating (Oct 2026). Nine hold EPA generator licences and report their grid use.
What is the biggest data centre in Ireland?
By measured grid draw in 2025, Microsoft's Grange Castle campus (about 155 MW across three EPA licences), then Amazon at Clonshaugh and Meta at Clonee (EPA annual environmental reports).
Who owns the data centres in Ireland?
By electricity, mostly US hyperscalers: Amazon (up to ~49%), Microsoft (~18%) and Meta (~15%) of the CSO total in 2025.

How we know

  • Grid electricity from the "Electricity" row of each AER's energy table (GJ), converted at 3,600 GJ per GWh, then to average MW over 8,760 hours.
  • Share = company average MW ÷ CSO national data-centre average MW. A cross-source ratio, so a ceiling. We re-read every AER to check for double counting.
  • Google is one of the companies measured. The owner may return to Google; see About for the conflict-of-interest statement. No Google-internal information is used.

Sources

Numbers on this page are read from our data build of 10 October 2026 and update when it changes. Text marked Our reading is our analysis, not a sourced fact. Found a mistake? See corrections; method notes are on methodology.

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