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Microsoft San Antonio SAT89/SAT90 Data Centers

Castroville, Medina County, Texas · All 45 Microsoft sites · Every Microsoft case on our tracker

Under constructionMixed receptionAI likelyRecord updated July 6, 2026

Microsoft San Antonio SAT89/SAT90 Data Centers is a data center under construction in Castroville, Texas (Medina County), operated by Microsoft. The public record puts it at announced May 2025, a reported $765 million investment. It has documented support and documented opposition on record.

Every line on this page traces to a public source listed at the bottom. Where a figure was looked for and not found, the row says so. A blank is never a zero.

Facility record

Under construction

Operator
Microsoft
Facility type
Data center, AI use likely
Location
Castroville, Medina County, TX
Coordinates
29.3500, -98.8800
Power capacity
Not established from a public source
Land
Not established from a public source
Investment
$765 million
Announced
May 2025
Utility
Grid (CPS Energy / renewable-matched)
Power source
Grid
Cooling
air
Water use
Not established from a public source
Jobs
Not established from a public source
Public subsidy
Not established from a public source
Community reception
Mixed reception
Source confidence
Reported by at least one credible outlet or filing

Timeline from the record

Newest first. Record entries come from the filings and reports the registry cites. Coverage entries are headlines from publisher feeds we monitor daily, linked to the outlet; last checked September 14, 2026.

  1. June 2025
    Under construction
    Construction scheduled to begin June 2025; completion targeted July 2027. Source: Data Center Dynamics
  2. May 2025
    Proposed
    Permit filings submitted for two new single-story data centers (SAT89 and SAT90) along US Hwy 90 in Medina County. Source: Data Center Dynamics

Opposition and litigation at this site

Partly. Both documented support and documented opposition to Microsoft San Antonio SAT89/SAT90 Data Centers in Castroville, Medina County, Texas appear in the record, with no clear majority position. Medina County, west of San Antonio, hosts one of the densest Microsoft data-center clusters in the U.S.; residents and officials have raised concern over farmland conversion and groundwater strain, while the local tax base benefits and a cooperative water-supply redesign (air-cooling) resolved one supplier's objection.

How the community has taken it

Reception is a sourced signal, not an editorial judgment: mixed reception means documented support and documented opposition both exist with no clear majority position on record.

Medina County, west of San Antonio, hosts one of the densest Microsoft data-center clusters in the U.S.; residents and officials have raised concern over farmland conversion and groundwater strain, while the local tax base benefits and a cooperative water-supply redesign (air-cooling) resolved one supplier's objection. No litigation found.

Source: San Antonio Report

Power and water

Microsoft has contracted 4.7 GW of renewable electricity in Texas statewide. Individual facility utility not confirmed in available sources.

Microsoft switched the Medina County design from evaporative to air-cooling at the request of Yancey Water Supply (which serves the area), cutting projected water use ~85% (~150,000 gpd). No site-specific residual water-use (MGD) figure is published.

Notes on the record

Two single-story facilities (SAT89 and SAT90), each 244,700 sq ft, along US Hwy 90 in Medina County. Part of Microsoft's broader San Antonio campus (operating since 2005). $765M investment covers the two new buildings; broader expansion including Texas Research Park adds another $1B. Coordinates are approximate Castroville area centroid; exact parcel not publicly identified. Completion target corrected to July 2027 per permit filings. Tax abatements for SAT89/SAT90 are shielded under Texas competitive-information law (a Chapter 312 abatement is confirmed only for the earlier SAT82 building); site-specific job counts are unpublished (an earlier SAT82 building cited ~50 permanent / ~1,500 construction).

What the record does not establish, and the document that would

In every fight on our tracker the decisive fact came out of a public records request. These are the requests for this site.

  • Power capacity in megawatts
  • Tax abatements or other public subsidy
  • Permanent jobs promised
  • Land area
Which document closes each gap
Power capacity in megawatts
The utility's large load service agreement, the interconnection request in the grid operator's queue, or the electrical site plan in the permit file.
Tax abatements or other public subsidy
The abatement, PILOT, or development agreement approved by the county, city, or development authority, and the state's data center sales tax exemption certificate if one was issued.
Permanent jobs promised
The economic development application or incentive agreement, which usually states a job commitment and a clawback.
Land area
The rezoning application, the plat, or the deed recorded with the county.

Have one of these documents? Send it to us and we will add it to the record with attribution.

Other sites within 30 miles

Distances are between recorded coordinates, many of which are a city or county centroid, so treat them as approximate. Cumulative load on one utility and one aquifer is the question a planning commission rarely asks.

Questions people ask about this site

Is there opposition to the Microsoft San Antonio SAT89/SAT90 Data Centers data center in Castroville?

Partly. Both documented support and documented opposition to Microsoft San Antonio SAT89/SAT90 Data Centers in Castroville, Medina County, Texas appear in the record, with no clear majority position. Medina County, west of San Antonio, hosts one of the densest Microsoft data-center clusters in the U.S.; residents and officials have raised concern over farmland conversion and groundwater strain, while the local tax base benefits and a cooperative water-supply redesign (air-cooling) resolved one supplier's objection.

Has anyone filed a lawsuit over the Microsoft San Antonio SAT89/SAT90 Data Centers data center?

No lawsuit over Microsoft San Antonio SAT89/SAT90 Data Centers appears in the record we track as of July 6, 2026. Residents most often reach a lawyer over water supply, well drawdown, noise from cooling plant, property value, or a rezoning approved without the notice the ordinance required. If any of that is happening near this site, it is worth a review whether or not a case has been filed yet.

How much water does Microsoft San Antonio SAT89/SAT90 Data Centers use?

No water withdrawal figure for Microsoft San Antonio SAT89/SAT90 Data Centers is on record here. Cooling is recorded as air, which is the strongest available clue: closed loop and air cooled plant draw far less than evaporative cooling. We leave the number blank rather than estimate one.

Who operates Microsoft San Antonio SAT89/SAT90 Data Centers, and how big is it?

Microsoft is the operator on record. We hold 45 sites for that company across the registry. No capacity figure is on record for this site.

How to cite this page

SueDataCenters.org Data Center Registry, "Microsoft San Antonio SAT89/SAT90 Data Centers," updated July 6, 2026, https://suedatacenters.org/data-centers/microsoft-san-antonio-expansion-tx.

Facility data from Compute Atlas (E. Kubiak), version 1.32.0 (September 7, 2026), licensed CC BY 4.0, record https://www.compute-atlas.com/facilities/microsoft-san-antonio-expansion-tx, retrieved September 14, 2026.

Corrections with a public source are welcome at the Compute Atlas record or through our contact page. The whole registry is available as CSV and JSON under CC BY 4.0.

Sources for this record

As compiled and cited by Compute Atlas, with our own reporting appended. Archived links are used where the original has moved.

  1. 1.Microsoft files for data center campus outside San Antonio · Data Center Dynamics · retrieved July 6, 2026
  2. 2.Microsoft $1.5 billion data center expansion in San Antonio · Datacenters.com · retrieved July 6, 2026
  3. 3.How One Texas County Struck a Deal With Its Data Centers · Texas Monthly · retrieved July 7, 2026
  4. 4.Data centers replacing Medina County farmland, straining resources · San Antonio Report · retrieved July 7, 2026

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