Fitted to a published figure of 480 million gallons a year
Air — what the stacks emit
Nitrogen oxides304t/yr
Sulphur dioxide347t/yr
Fine particulates47.8t PM2.5
Health damages$42.2M/yr
Where it burns
ERCOT — Texas
Generation mix
Gas 40 · Wind 24 · Solar 11 · Coal 13 · Nuclear 9
CO₂e
764 kt/yr — climate, not air quality
Who wanted it
Who asked for it
Microsoft — self-build and Azure customers
Who approved it
City of San Antonio + Bexar County incentives; San Antonio Water System recycled-water contract
What it serves
Azure south-central US region
IT capacity
300 MW running of 600 MW announced
Runs largely on SAWS reclaimed water rather than potable supply, which is the mitigation most often proposed elsewhere. Even so, in a city under recurring Stage 3 drought restrictions the volumes remain politically contested.
Water and air figures are modelled from disclosed capacity, not measured — site-level
error is roughly ±40%. Diesel backup generators are not counted, so on-site figures are floors.
Full method.