Gigawatt Ledger · one-page briefing
Campus profile Operating
Grange Castle / Dublin West
Microsoft · Clondalkin, Dublin, Leinster, Ireland
The resource footprint
Modelled averageIn one day, this campus consumes about
1.6550-metre swimming pools
Filled with the volume of water consumed by the campus and its electricity supply.
The actual estimate1,090,439 US gallons consumed
Power-plant water may come from a different watershed. This is a volume comparison, not a claim that households lose this water.
At current operating capacity · Annual model spread evenly over time, not a live meter. Site estimates may differ by roughly ±40%.
Comparison sizes & sources
One pool = 50 × 25 × 2 metres = 2.5 million litres (about 660,430 US gallons). Pool depths vary; this is a defined comparison size.
One home-year = 10,791 kWh, the EIA’s 2022 average US residential electricity purchases. This excludes electricity generated at home and is a fixed US benchmark for all sites.
One car-year = 4.6 tonnes CO₂, the EPA’s typical passenger vehicle tailpipe estimate. The campus model is in CO₂e; the comparison expresses approximate climate scale, not equal mixtures of pollutants.
Monthly values are annual totals ÷ 12; daily values are annual totals ÷ 365. Actual demand varies. Comparisons cover the whole campus, including non-AI uses.
Water: see the numbers and sources
This is water used up, mainly through evaporation. Power-generation water may be used in a different watershed.
- Pressure on local water
- Low — a regional measure of demand compared with available water
- Where the water comes from
- Municipal potable supply
- Cooling
- Free-air cooling almost year-round; evaporative on rare warm days
- Basis
- Modelled from cooling design — WUE 0.25 L/kWh
Air: see the numbers and sources
The totals include nitrogen oxides, sulphur dioxide and fine particles. They cover both this site and the power plants supplying it.
- Health range
- $6.91–19.5 million a year. Lower bound is EASIUR national mid-range; upper is EPA benefit-per-ton at a ~$12M VSL.
- Statistical deaths
- 1.63 a year at that VSL — a national-average conversion from tons, not a local concentration study.
- Equals
- 295,946 cars of NOx
- Where it burns
- Ireland — EirGrid
- Generation mix
- Gas 47 · Wind 34 · Coal 3
- Diesel backup
- Diesel backup is not yet counted for this campus, so on-site air figures are a floor.
- CO₂e
- 641 kt/yr — climate, not air quality
The project, approvals and community concerns
- Who asked for it
- Microsoft — self-build and Azure customers, including EU data-residency workloads
- Who approved it
- South Dublin County Council planning; EirGrid connection agreements — new Dublin-area connections are effectively frozen until 2028
- What it serves
- Azure North Europe — the default European region for much of the world's SaaS
- IT capacity
- 300 MW current capacity / 450 MW full-build scenario
Irish data centers passed 21% of national electricity consumption in 2023 and kept climbing — more than all urban households combined. EirGrid's de facto Dublin moratorium is the strongest grid-side brake any country has applied.
Keep this guide handy
53.3130°, -6.4200°
Quote or share these estimates
Gigawatt Ledger (2026). Grange Castle / Dublin West: water and air. https://gigawatt-ledger.pages.dev/site/grangecastle/. Modelled from disclosed capacity; site-level error ±40%.
Include the estimate’s date, whether it describes current or proposed capacity, and its uncertainty. Get an embeddable card.
Gigawatt Ledger · September 2026. Water and air figures are estimated from public records and disclosed capacity. How we calculate them · Use this in your community.