Being built
Microsoft data center campus SAT89-SAT91 (U.S. 90 West, near Castroville)
Also called: SAT89, SAT90, SAT91
Microsoft is building another data center campus on U.S. 90 just west of Castroville. State filings show two one-story buildings with about 489,400 square feet in all. About 124 acres had been cleared by 2024.
Where things stand: Being built; filings show two large buildings at 2995 U.S. 90 West.
🕒 Latest update (March 2025): Microsoft filed state plans for two buildings (SAT89 and SAT90) at 2995 U.S. 90 West, costing $765 million, built June 2025 to July 2027.
What we know
- 📍 Where2995 U.S. 90 West, west of Castroville, Unincorporated Medina County, Medina County
- 🏢 CompanyMicrosoft
- 👤 Built forMicrosoft
- 💵 Cost$765 million
❓ Still unanswered
Nobody has answered these in public yet. Can you help find out?
- How much water and power will this campus use? 🙋 I'll find out
- Did Medina County give a tax break for this site? 🙋 I'll find out
What happened so far
- Aug 2024About 124 acres were cleared for a data center on U.S. 90 west of Castroville.
- March 2025Microsoft filed state plans for two buildings (SAT89 and SAT90) at 2995 U.S. 90 West, costing $765 million, built June 2025 to July 2027.
🛰️ See it from above
An aerial photo of the area.
Photos: USGS The National Map.
Where this comes from
- Microsoft files for data center campus outside San Antonio · DatacenterDynamics · March 21, 2025
- Microsoft Drops $400 Million Data Fortress on Castroville's Edge · Hoodline · Dec 25, 2025
- Castroville Braces as $500 Million Data Giant Rolls In on U.S. 90 · Hoodline · July 18, 2026
- Data centers replacing farmland, straining resources and nerves · San Antonio Report · Aug 25, 2024
- Texas data centers map and list · Cleanview (tracker) · Oct 2026
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