# SAT82 Data Center

ERCOT data center · https://askthegrid.com/assets/facilities/sat82-data-center

Microsoft is developing SAT82, a 244,676-square-foot data-center building at 18844 FM 1957 in Castroville with five colocation areas, estimated at $482.6 million. Permitted construction is scheduled to start April 11, 2026, with completion targeted for February 8, 2028; no power capacity or commercial-operation date is specified.

## Identity and location

- Operating status: approved
- Asset scope: building
- Location: 18844 FM1957, San Antonio, TX
- Operator: Microsoft (exact asset) — https://www.microsoft.com/

## Power and grid context

- ISO/RTO: ERCOT
- Balancing authority: ERCOT

## Development

- Site status: Permitted; TDLR review complete. The permit lists construction as scheduled to start April 11, 2026, but the evidence does not explicitly confirm that physical construction had begun as of July 27, 2026.
- Gross floor area: 244,676 square feet
- Buildings: 1
- Construction: SAT82 Data Center is a privately funded Microsoft new-construction project at 18844 FM 1957, Castroville, Texas. The permit describes a one-story building with five colocation areas and approximately 244,676 square feet of gross building area. Construction is scheduled to start April 11, 2026 and finish February 8, 2028; no separate commercial-operation date is stated.

## Compute and operations

- Facility classes: colocation
- Operating context: Planned Microsoft SAT82 data-center building at 18844 FM 1957 in Castroville, Texas. The official filing describes a one-story, approximately 244,676-square-foot building with five colocation areas; construction was scheduled from April 11, 2026 through February 8, 2028. No further operating or commercial model is disclosed for this exact building.

## Sources

- [http://datacenter.fyi/public-record/microsoft-sat82-data-center-e24b67b9](http://datacenter.fyi/public-record/microsoft-sat82-data-center-e24b67b9)
- [http://datacenterdynamics.com/en/news/microsoft-plans-400m-data-center-in-castroville-texas](http://datacenterdynamics.com/en/news/microsoft-plans-400m-data-center-in-castroville-texas)
- [http://tdlr.texas.gov/TABS/Search/Project/TABS2024023976](http://tdlr.texas.gov/TABS/Search/Project/TABS2024023976)
- [Fetched web page](http://www.castrovilletx.gov/AgendaCenter/ViewFile/Minutes/_05162024-868)
- [Measuring energy and water efficiency for Microsoft datacenters - Microsoft Datacenters](https://datacenters.microsoft.com/sustainability/efficiency/)
- [Microsoft SAT 82 — Data Center - DC Hub](https://dchub.cloud/facilities/microsoft-microsoft-sat-82-66188529)
- [Fetched web page](https://mccmeetings.blob.core.usgovcloudapi.net/cstroviltx-pubu/MEET-Packet-313375330b234594955c80222a4576dd.pdf)
- [Microsoft to Build $400M Data Center in Castroville, Bringing Job](https://myneighborhoodnews.com/microsoft-to-build-400m-data-center-in-castroville-bringing-jobs-and-growth-to-far-west-san-antonio)
- [Data centers replacing Medina County farmland, straining ...](https://sanantonioreport.org/medina-county-farmland-data-centers-strain/)
- [Water | Castroville, TX](https://www.castrovilletx.gov/2371/Water)
- [Microsoft SAT82 Data Center - Castroville, TX](https://www.datacenter.fyi/public-record/microsoft-sat82-data-center-e24b67b9)
- [Microsoft to build $482.5 million data center in Castroville](https://www.expressnews.com/business/real-estate/article/microsoft-data-center-castroville-san-antonio-19615951.php)
- [Microsoft SAT82 Castroville Data Center Watch - Low Voltage Nation](https://www.lowvoltagenation.com/posts/microsoft-sat82-castroville-data-center-watch)
- [Microsoft plans $482M data center in Medina County](https://www.mysanantonio.com/business/article/microsoft-medina-county-19606508.php) — My San Antonio · 2024-07-30
- [How Microsoft is pouring $1.5B into a tiny Hill Country town](https://www.mysanantonio.com/news/hill-country/article/microsoft-castroville-20391352.php) — My San Antonio · 2025-07-05
- [Mega data hub plans spark concerns in tiny Texas town](https://www.mysanantonio.com/realestate/article/microsoft-data-centers-castroville-san-antonio-20827271.php) — My San Antonio · 2025-08-24
- [The data centers of Medina County | Off the Kuff](https://www.offthekuff.com/wp/?p=115782) — Off the Kuff · 2024-10-10
- [Indexes to Air Permits by Rule - Texas Commission on Environmental Quality - www.tceq.texas.gov](https://www.tceq.texas.gov/permitting/air/permitbyrule/air_pbr_index.html)
- [Water Rights Permits: Annual Water Use Reporting - Texas Commission on Environmental Quality - www.tceq.texas.gov](https://www.tceq.texas.gov/permitting/water_rights/wr-permitting/water-right-permits-annual-water-use-report)
- [TDLR TABS - Project Details](https://www.tdlr.texas.gov/TABS/Search/Project/TABS2024023976)
- [Medina Technology Park - Tract](https://www.tract.com/project/medina-technology-park/)

## Data quality

- The authoritative TDLR record identifies the exact asset as SAT82 Data Center, project TABS2024023976, at 18844 FM 1957; similarly named SAT82 reports at FM 471 N are a separate project or contain an address error and were not merged.
- The strongest exact-site community evidence is limited: a local article reports mixed resident reactions, and Castroville EDC minutes record general discussion of data centers and a Microsoft annexation discussion. No verified SAT82-specific community-benefit agreement, water commitment, traffic mitigation plan, or public-relations program was found.
- The reported tax abatement is a project incentive and should not be described as a community benefit without separately accounting for foregone tax revenue.
- No MW, water-use volume, PUE, WUE, tenant, or commercial-term claims are made because the reviewed sources do not establish those facts for this exact building.
- Power values retain their reported, requested, contracted, energized, gross-campus, or critical-IT basis.

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Canonical page: https://askthegrid.com/assets/facilities/sat82-data-center
Profile generated: 2026-07-27T23:45:23.758563Z
Source: Ask the Grid — https://askthegrid.com/