Data Center Campus
Microsoft: San Geronimo Campus
Microsoft's two-building data center campus on about 727 acres off County Road 381 in eastern Medina County, west of San Antonio, where STEC plans its new San Geronimo substation. Site work began in 2025, with completion planned for 2029.
Campus at a Glance
Microsoft is developing a two-building data center campus on County Road 381 in unincorporated eastern Medina County, about 25 miles west of downtown San Antonio and about 3 miles northwest of its Texas Research Park campus.
Land. Microsoft bought about 727 acres from Wurzbach Land Holdings LP in June 2023. The holding fronts County Road 381 and runs west in a narrow strip toward FM 471.
Power. Medina Electric Cooperative provides retail service. South Texas Electric Cooperative (STEC) plans its new San Geronimo 138-kV substation on Microsoft's land, fed by a new Castroville-Rio Medina-San Geronimo line (PUC Docket 57793). CPS Energy will tie San Geronimo to its new Legend Falls substation on the Texas Research-Talley Road 138-kV line (PUC Docket 59549).
Milestones. Microsoft registered both buildings with TDLR in February 2025 and re-registered them with later dates in March 2026. Clearing began in 2025, and mass grading continued through 2026.
Buildings
Sites on this Campus
| Site | Operator | Status | Operational | Building Size | Built |
|---|---|---|---|---|---|
| PrimeInterested in this information?Contact us | Microsoft Azure |
Planned
|
— | — | 2029 |
| Center UltraInterested in this information?Contact us | Microsoft Azure |
Planned
|
— | — | 2029 |
Map and Nearby Locations
Microsoft: San Geronimo Campus Power Growth Over Time
Developer
Microsoft uses Containers (called ITPACs) to build out its data centers. These Containers are Shipping Containers fitted with all the necessary climate control, networking, server racks and other hardware necessary to be a “mini” data center all in one.
Azure Regions
An Azure region is a set of data centers deployed within a latency-defined perimeter and connected through a dedicated regional low-latency network.
With more global regions than any other cloud provider, Azure gives customers the flexibility to deploy applications where they need to. Azure is generally available in 46 regions around the world, with plans announced for 8 additional regions.
Geographies
An Azure geography is a discrete market, typically containing two or more regions, that preserves data residency and compliance boundaries.
Geographies allow customers with specific data-residency and compliance needs to keep their data and applications close. Geographies are fault-tolerant to withstand complete region failure through their connection to our dedicated high-capacity networking infrastructure.
Availability Zones
Availability Zones are physically separate locations within an Azure region. Each Availability Zone is made up of one or more data centers equipped with independent power, cooling, and networking.
Availability Zones allow customers to run mission-critical applications with high availability and low-latency replication.