Microsoft · San Antonio, Texas

Microsoft SAT40

106MW

The power of 86,000 US homes.

Drawing power since May 2024.

Capital cost
$2.8B
Chips
H100, B300
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Power over time

facility power · 4 milestones
Every milestone
  1. 28 Dec 2018 — Land clearing begins for the site, specifically digging up a parking lot and making outlines for the buildings. Evident on Google Earth.
  2. 24 May 2024 66 MW Building 1 operational. Estimated 3 months out from February, when there was still construction equipment.
  3. 1 Dec 2025 106 MW Building 2 operational. No more construction on building, and surrounding roads are also complete.
  4. 4 Feb 2026 106 MW Site has already been completed, with no more visible construction on any building.

Gas made 40% of the power on this site's grid

net generation by fuel · Oct 2025 to Sep 2026

Electric Reliability Council of Texas, Inc. ERCO · balancing authority

  1. Gas 40%
  2. Coal 12%
  3. Nuclear 8%
  4. Wind 24%
  5. Solar 16%
  6. Hydro <1%
  7. Other <1%

The grid of the utilities that serve Bexar County, TX. Each grid is a balancing authority. Generation only; imports are excluded. Every grid behind an AI site.

Owners plan 750 MW of new power in Bexar County, mostly storage

power plants in Bexar County · EIA-860M, September 2026
  1. Alamo City ESS Storage · 200 MW · Jul 2027 · proposed · Alamo City ESS LLC
  2. Rush ESS Storage · 200 MW · Dec 2031 · proposed · Rush ESS LLC
  3. Padua 3 Storage · 200 MW · Oct 2026 · being built · Padua 3
  4. El Patrimonio Solar · 150 MW · Sep 2027 · proposed · Heritage Solar LLC

In service in Bexar County today: 5.0 GW. Since January 2023: 511 MW added, 942 MW retired. Owners plan to retire 1.5 GW more. A plant in the same county does not mean it feeds the site. Power plants near every AI site.

Sources

selected by Epoch AI
  1. TDLR for SAT40 (Building 2)
  2. TDLR for a set of three long buildings, which includes the first building we believe is for AI (Building 1)

Data: Epoch AI, “AI data centers”, CC BY 4.0, retrieved 22 Oct 2026. Facility power adds cooling and other overhead to the IT power the servers draw. Placed at the centre of San Antonio. Grid: U.S. Energy Information Administration, Hourly Electric Grid Monitor (Form EIA-930), public domain, retrieved 16 Oct 2026; utilities by county from Form EIA-861 and the U.S. Census Bureau Geocoder, public domain. Power plants: U.S. Energy Information Administration, Form EIA-860M, public domain, inventory as of September 2026. All sources.