# Microsoft Castroville SAT89-90 Data Center

ERCOT data center · https://askthegrid.com/assets/facilities/microsoft-castroville-sat89-90-data-center--grid-load-9fdf22dea89b04f5

The Microsoft Castroville SAT89-90 Data Center is a campus under construction on US Highway 90 West near Castroville in Medina County, Texas. The state registration describes two single-story data center buildings, each with five colos, totaling approximately 489,400 square feet, at an estimated cost of $765,000,000. Microsoft is the registered owner and operator. The record gives no campus electrical demand; the only published ratings are for emergency generators.

## Identity and location

- Operating status: under_construction
- Asset scope: campus
- Location: 2995 US HWY 90 W, Castroville, Medina County, TX
- Owner: Microsoft (exact asset)
- Operator: Microsoft (exact asset)
- Developer: Microsoft (exact asset)

## Power and grid context

- ISO/RTO: ERCOT

## Sources

- [https://records.tceq.texas.gov/cs/idcplg?IdcService=TCEQ_EXTERNAL_SEARCH_GET_FILE&dID=9517989&Rendition=Web](https://records.tceq.texas.gov/cs/idcplg?IdcService=TCEQ_EXTERNAL_SEARCH_GET_FILE&dID=9517989&Rendition=Web)
- [TDLR TABS - Project Details](https://www.tdlr.texas.gov/TABS/Projects/TABS2025012765)
- [https://records.tceq.texas.gov/cs/idcplg?IdcService=TCEQ_EXTERNAL_SEARCH_GET_FILE&Rendition=Web&dID=9520383](https://records.tceq.texas.gov/cs/idcplg?IdcService=TCEQ_EXTERNAL_SEARCH_GET_FILE&Rendition=Web&dID=9520383)
- [Data centers replacing farmland, straining resources and nerves](https://sanantonioreport.org/medina-county-farmland-data-centers-strain/)
- [https://geocoding.geo.census.gov/geocoder/geographies/onelineaddress?address=2995+US+HWY+90+W%2C+Castroville%2C+TX&benchmark=Public_AR_Current&vintage=Current_Current&format=json](https://geocoding.geo.census.gov/geocoder/geographies/onelineaddress?address=2995+US+HWY+90+W%2C+Castroville%2C+TX&benchmark=Public_AR_Current&vintage=Current_Current&format=json)
- [Data Centers in Texas](https://comptroller.texas.gov/taxes/data-centers/data-center-lists.php)

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Canonical page: https://askthegrid.com/assets/facilities/microsoft-castroville-sat89-90-data-center--grid-load-9fdf22dea89b04f5
Profile generated: 2026-11-02T21:32:22.900123Z
Source: Ask the Grid — https://askthegrid.com/