Stream Data Centers San Antonio III
Proposed size
200 MW
Site area
135 ac
Buildings
5
Building area
1,500,000 sq ft
Cooling
Evaporative cooling towers (CPS-powered)
Investment
$0.4B
Developer
Stream Data Centers
Stream Data Centers broke ground June 26, 2024 on a 135-acre hyperscale campus at 11203 Military Drive W in west San Antonio. The five-building campus will support up to 200 MW of IT capacity across 1.5 million sq ft at full build. The campus includes an on-site 334 MW CPS Energy substation. Phase 1 (40 MW, 300,000 sq ft) was scheduled for occupancy Q2 2025; full campus completion anticipated 2027.
Water Impact
Daily water use (estimated range)
1.8M – 2.6M gal/day
Water returned per day
None reported
Per Estimated from 200 MW full-build using LBNL benchmark 9,000–13,000 gal/day/MW, based on MW benchmark at WUE 1.8–2.5 L/kWh, 80% utilization; first phase 40 MW operational Q2 2025
vs. 5M gal/day (typical 400 MW facility)
The higher estimate is equivalent to the daily water use of approximately 26,000 households. San Marcos has approximately 25,000 households.
- Water intake
- 1.8M – 2.6M gal/day
- 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: 11203 Military Drive W, San Antonio, Bexar County, TX
Distance to aquifer edge: 0 miles
Water source: SAWS
Infrastructure
- Water provider
- SAWS
- Power provider
- CPS Energy / ERCOT
- On-site generation
- 334 MW CPS Energy on-site substation
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Timeline
March 4, 2026
San Antonio City Council receives CPS Energy and SAWS briefing on data center growth
San Antonio City Council received a joint briefing from CPS Energy and SAWS on data center impacts to the electric grid and water supply. Council members representing the west-side cluster where Stream San Antonio III is located signaled support for a Unified Development Code update to regulate future approvals.
Source →(opens in new tab)November 11, 2025
KSAT maps San Antonio data centers; City Council files first policy CCR
KSAT12 published an interactive map of nearly 50 data centers completed or planned in San Antonio. District 6 Councilmember Ric Galvan filed the city's first Council Consideration Request to examine data center growth and its impact on water, electricity, and neighborhoods — directly prompted by the concentration of large campuses including Stream San Antonio III.
Source →(opens in new tab)November 1, 2024
TDLR fit-out permit filed for SAT B1 data hall (TABS2025003451)
Stream Data Centers filed TDLR permit TABS2025003451 for a 24,000 sq ft tenant fit-out of data hall space at 11203 Military Dr W (SAT B1). Registered October 17, 2024; work scheduled November 2024 – December 2025 at an estimated cost of $10 million. Design firm: Corgan.
Source →(opens in new tab)July 1, 2024
Community Impact covers Stream groundbreaking as sign of San Antonio tech growth
Community Impact published coverage of Stream Data Centers' June 26 groundbreaking, framing it as evidence of accelerating technology and biotech company growth on San Antonio's far West Side.
Source →(opens in new tab)June 26, 2024
Stream breaks ground on 135-acre hyperscale campus (San Antonio III)
Stream Data Centers broke ground on its third San Antonio campus at 11203 W Military Drive, a 135-acre site planned for up to five 40 MW AI-ready buildings totaling 1.5 million sq ft and 200 MW at full build. The first 300,000 sq ft building targeted Q2 2025 occupancy. An on-site 334 MW CPS Energy substation was included in the project.
Source →(opens in new tab)June 26, 2024
Data Center Dynamics covers San Antonio III groundbreaking
Data Center Dynamics reported on Stream's third San Antonio campus groundbreaking, noting the $400 million investment, five-building plan, 200 MW capacity at full build, and on-site 334 MW CPS substation at 11203 W Military Drive.
Source →(opens in new tab)
Documents
Sources
- 1. Stream Data Centers Breaks Ground on New Hyperscale Data Center Campus in San Antonio — Stream Data Centers, 2024-06-26. Link →(opens in new tab)
- 2. Stream breaks ground on third data center campus in San Antonio, Texas — Data Center Dynamics, 2024-06-26. Link →(opens in new tab)
- 3. Behind the boom: San Antonio data centers spark resource worries — KENS5, 2025-11-01. Link →(opens in new tab)
Community Notes
Located on San Antonio's far West Side near Loop 1604, within the Edwards Aquifer recharge zone. Existing residents and aquifer advocates have raised concerns about water use as the Edwards Aquifer faces historically low levels. San Antonio City Council initiated data center zoning review in 2025, partly driven by this corridor's rapid development.