Data Center Campus
Microsoft: Castroville Hwy 90 Campus
Microsoft's two-building data center campus on a 112-acre lot on US Highway 90, about 4 miles west of Castroville in Medina County, next to Tract's Medina Technology Park. Site work began in 2024, with completion planned for 2027.
Campus at a Glance
Microsoft is building two single-story data centers, SAT89 and SAT90, at 2995 US Highway 90 W, about 4 miles west of Castroville in unincorporated Medina County. Microsoft registered them with TDLR in February 2025 as one project.
Land. Microsoft bought the 112-acre site from Maurine D. Grooms in September 2021 and platted it as SAT 89 Lot 1. Tract's Medina Technology Park adjoins it on the north and east. CyrusOne's SAT14 land adjoins it on the west.
Backup power. TCEQ registration 182686 (February 2026) covers sixty 3.1 MW Caterpillar diesel generators, six per colo across ten colos, plus two 500 kW admin generators.
Utilities. The site is in Medina Electric Cooperative territory. East Medina County Special Utility District negotiated a non-standard water service agreement with Microsoft in 2024.
Buildings
Sites on this Campus
| Site | Operator | Status | Operational | Building Size | Built |
|---|---|---|---|---|---|
| Valley GammaInterested in this information?Contact us | Microsoft Azure |
Under Construction
|
— | — | 2027 |
| Station GammaInterested in this information?Contact us | Microsoft Azure |
Planned
|
— | — | 2027 |
Map and Nearby Locations
Microsoft: Castroville Hwy 90 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.