Microsoft Westover Link Campus (SAT15/SAT16)
Buildings
2
Building area
490,000 sq ft
Cooling
Evaporative cooling (assumed; Microsoft standard)
Investment
$0.8B
Developer
Microsoft Corporation
Microsoft filed plans in early 2025 for two data centers (SAT15 and SAT16) at 3555 Westover Link in west San Antonio, totaling approximately 490,000 sq ft and representing an investment of approximately $765 million. This is distinct from — but physically near — the Wiseman Blvd campus. Construction was planned to begin mid-2025. Microsoft has identified San Antonio's west side as a primary Azure cloud infrastructure hub.
Water Impact
Daily water use (estimated range)
Unknown
Water returned per day
None reported
Per MW capacity not yet publicly disclosed, based on Two buildings totaling 490,000 sq ft; MW not confirmed in TDLR records
vs. 5M gal/day (typical 400 MW facility)
- Water intake
- Unknown
- Lost to evaporation
- 100%
- Returned to system
- 0% (None reported)
Direct water figures are estimates from permit applications and developer disclosures. Indirect (power generation) figures are calculated estimates. Actual water use depends on technology choices, operating capacity, and weather conditions.
Location
Address: 3555 Westover Link, San Antonio, Bexar County, TX
Distance to aquifer edge: 0 miles
Water source: SAWS
Infrastructure
- Water provider
- SAWS
- Power provider
- CPS Energy / ERCOT
This project needs your attention.
Permitted — the decision is made, but conditions still matter
The primary decision cannot be undone, but the conditions attached to the approval can still be negotiated or enforced. Officials can be held accountable for permit violations. Community pressure matters for shaping how the project is operated and what monitoring is required.
Timeline
May 1, 2026
SAT15 projected completion — May 2026 per revised TDLR schedule
Microsoft SAT15 at 3555 Westover Link has a revised TDLR completion date of May 1, 2026. The 245,000 sq ft, $215.9 million building includes five colocation data halls. This reflects an extended timeline from the original Q1 2024 target.
Source →(opens in new tab)March 1, 2025
Data Center Dynamics covers Microsoft SAT16 TDLR filing
Data Center Dynamics reported Microsoft's SAT16 TDLR filing for a $215 million, 245,000 sq ft building at 3555 Westover Link, noting that Microsoft's TDLR-registered spending on its West Side San Antonio data centers had exceeded $1.17 billion since 2015.
Source →(opens in new tab)February 1, 2025
Microsoft files TDLR permit for SAT16 at Westover Link — $215M
Microsoft filed a TDLR permit in February 2025 for SAT16 at 3555 Westover Link, a second 245,000 sq ft data center building with five colo facilities and administrative areas, estimated at $215 million. The filing confirmed expansion of the Westover Hills campus adjacent to the in-progress SAT15.
Source →(opens in new tab)October 1, 2022
Construction begins on Microsoft SAT15 at Westover Link
Per TDLR permit TABS2022026535, construction on Microsoft SAT15 at 3555 Westover Link officially began October 1, 2022. The 245,000 sq ft building includes five colocation data halls and administrative areas. Originally targeted for Q1 2024 completion, the schedule was later extended to May 2026.
Source →(opens in new tab)August 18, 2022
Microsoft files TDLR permit for SAT15 at 3555 Westover Link — $215.9M (TABS2022026535)
Microsoft filed TDLR permit TABS2022026535 on August 18, 2022 for SAT15 at 3555 Westover Link, San Antonio. The project covers a 245,000 sq ft data center building shell and fit-out including administrative areas and five colo facilities. Scheduled start October 1, 2022; revised completion May 1, 2026. Estimated cost $215,900,000.
Source →(opens in new tab)
Documents
Sources
- 1. Microsoft files to build two more data centers in San Antonio, Texas — Data Center Dynamics, 2025-03-01. Link →(opens in new tab)
- 2. Number of Microsoft data centers in San Antonio starting to add up — San Antonio Report, 2025-01-01. Link →(opens in new tab)
Community Notes
Part of the dense data center cluster forming in west Bexar County along the Edwards Aquifer recharge zone. Microsoft's cumulative investment in Bexar and Medina counties now exceeds $1.5 billion across more than 300 acres in Bexar County alone.