This record consolidates 13 research observations while retaining source distinctions, location precision and unresolved fields.
| Operator / developer | Sabey Data Center Properties LLC / SDC - Austin LLC |
|---|---|
| Jurisdiction | Round Rock, TX |
| Address | 1300 Louis Henna Blvd |
| Location precision | street address |
| Coordinates | Not published; no coordinate inferred |
| Capacity | 84 MW |
| Aliases | Sabey Data Centers SDC Austin Campus (Round Rock) · 1300 Louis Henna Boulevard · SDC Austin · SDC - Austin Tandem Data Center · SDC Austin III / SDC Austin IV · former Sears call center site |
| Project profile | 0 rows |
|---|---|
| Intent / permits | 0 rows |
| Civic / infrastructure | 1 rows |
One of the very few Central Texas sites with a municipally verified water-use figure. Building A hosts TACC's Horizon system. Comptroller registrations confirm two separate registered projects (Tandem and SDC Austin III/IV) in the Sabey Austin/Round Rock portfolio.
Key data: NOT_FOUND | ERCOT South Central / Austin-Central Texas load zone | City of Round Rock Water | NOT_FOUND
Claim classification: Not yet assigned
Status date: 2026-09-05
Developer: Sabey Data Centers | Owner: SDC - Austin LLC; SDC Austin III LLC | Property entity: SDC - Austin LLC / SDC Austin III LLC | County: Williamson | Research region: Austin / Central Texas | Tenants/customers: Texas Advanced Computing Center (TACC) — Horizon AI supercomputer (Building A) | Cirrascale Cloud Services, LLC (registered occupant, 'SDC - Austin Tandem Data Center') | JS Data Center LLC (registered occupant, SDC Austin III/IV)
Claim classification: Not yet assigned
Status date: 2026-09-05
Key data: Utility region: ERCOT | Grid area: ERCOT South Central / Austin-Central Texas load zone | Gross MW: 84 | Grid/market records: Texas Comptroller Qualifying Data Center registration 'SDC - Austin Tandem Data Center', effective 03/13/2024; owner SDC - Austin LLC; occupant Cirrascale Cloud Services, LLC; operator SDC - Austin LLC | Texas Comptroller Qualifying LARGE Data Center Project registration 'SDC Austin III LLC dba SDC Austin IV LLC', effective 08/24/2026; owner SDC Austin III LLC; occupant JS Data Center LLC; operator Sabey Data Center Properties LLC
Claim classification: Not yet assigned
Status date: 2026-09-05
Key data: Water utility: City of Round Rock Water | Water source: City of Round Rock Water (Colorado River / LCRA basin) | Water demand: ~2,000,000 gallons/year (~5,500 gal/day) for Building A per City of Round Rock monitoring data | Cooling: Liquid cooling (primary; ~86% of deployments per Sabey) plus air cooling
Claim classification: Not yet assigned
Status date: 2026-09-05
Key data: Permit IDs: Comptroller Qualifying Data Center registration (SDC - Austin Tandem Data Center),Comptroller Qualifying Large Data Center Project registration (SDC Austin III LLC dba SDC Austin IV LLC) | Comptroller Qualifying Data Center registration (SDC - Austin Tandem Data Center) | Comptroller Qualifying Large Data Center Project registration (SDC Austin III LLC dba SDC Austin IV LLC) | Jurisdictions: City of Round Rock | Williamson County | City of Round Rock Water | Texas Comptroller | ERCOT
Claim classification: Not yet assigned
Status date: 2026-09-05
City of Round Rock publishes data center monitoring information, including verified water use for Building A
Claim classification: Not yet assigned
Status date: 2026-09-05
Liquid cooling keeps measured water use to roughly 5,500 gal/day, far below evaporative benchmarks for comparable load
Claim classification: Not yet assigned
Status date: 2026-09-05
Key data: Surrounding infrastructure: Adaptive reuse of the former Sears call center site on Louis Henna Blvd
Claim classification: Not yet assigned
Status date: 2026-09-05
Comptroller Qualifying Data Center registration effective (Cirrascale as occupant)
Claim classification: Not yet assigned
Status date: 2024-03-13
Building A (213,000 sq ft, ~30 MW) completed; selected by TACC for the Horizon AI supercomputer
Claim classification: Not yet assigned
Status date: 2024-10-01
Building B (54 MW, liquid-cooling-ready) breaks ground
Claim classification: Not yet assigned
Status date: 2025-07-01
Comptroller Qualifying Large Data Center Project registration effective for SDC Austin III/IV
Claim classification: Not yet assigned
Status date: 2026-08-24
First capacity in Building B available
Claim classification: Not yet assigned
Status date: 2027-07-01