Data center profile · 15000 Lambda Drive, San Antonio, Bexar County, Texas (Texas Research Park)

Microsoft SAT40 (San Antonio)

Microsoft's Lambda Drive site in San Antonio, in service: about 75 MW of IT capacity (Epoch AI estimate) on CPS Energy power, diesel backup only.

Operating. The building was registered complete with Texas in Sept. 2023; a Feb. 2026 Epoch AI snapshot lists it as in service. The federal air operating permit is pending; the governor's Sept. 2026 halt on data-center permits leaves its timing unclear.
75 MW
IT capacity running
Epoch AI estimate; Epoch also lists 106 MW planned for the campus
153,227 sq ft
SAT40 building
registered with Texas as a $175.9M shell
53.3 MW
backup diesel engines at SAT40
17 engines; emergency backup, not a power supply
$1B
Texas Research Park plan on 158 acres
press; covers more than SAT40
OperatorMicrosoft
CustomerMicrosoft (owner-occupied)
Planned IT capacity85 MW at full build-out (our estimate from the company's 106 MW campus power figure)
First building in serviceIn service since May 2024 (about 75 MW of IT capacity live, estimated)
Next stepDecision on the pending federal air operating permit (no date published)
Power

Power and the grid

Energized, size not disclosed

Sources on record, size not disclosed

Getting on the grid

Who supplies what, what it costs, and what is still not public.

  1. Sept. 15, 2023
    Building registered complete
    The Texas building registration lists Sept. 15, 2023 as the completion date for the SAT40 shell. see Permits
  2. Feb. 4, 2026
    Running per Epoch AI
    Epoch AI lists two buildings and about 75 MW operating, with no more visible construction.
  3. Not set
    No power contract on record
    No public electric service agreement or contracted load was found with CPS Energy. News report · Oct. 2026

Backup generators on file

Emergency units only; they are not a power supply for the campus.

Permits

Permits checklist

1 pending · 2 granted · 1 checked, nothing on file

What we found for this site. Zoning, site plan and water approvals are not in our sources.

Risks

What could slow it down

Money

Money on record

$175.9M
cost of the SAT40 building shell
as registered with Texas in 2023 State agency · Oct. 2026
$1B
campus plan on 158 acres
press; includes the earlier SAT46 building News report · Oct. 2026
Land assembly

1 recorded land document for the campus company in county records (Dec. 2015); it lists no price. Parcel counts come from the deed; acreage is not recorded.

Timeline

What happened, and what is due

SitePaper trailConstructionPowerPermitsMoneyLegalUpcoming
  1. Dec. 9, 2015
    Money Land purchase by Microsoft Corp recorded, no price on the deed; seller not named County deed records · Dec. 2015
  2. Dec. 2015
    Site Microsoft's purchase of the 158-acre research park land is reported (press) News report · Oct. 2026
  3. March 2021
    Permits The neighboring SAT46 building (79,385 sq ft, $140M) is filed with Texas (press) State agency · Oct. 2026
  4. June 15, 2023
    Permits SAT40 is registered with Texas, with a $175.9M estimated cost State agency · Oct. 2026
  5. Sept. 15, 2023
    Site Registered completion date for the SAT40 shell State agency · Oct. 2026
  6. Jan. 26, 2024
    Permits All 172 campus backup engines are claimed under a Texas permit-by-rule State agency · Oct. 2026
  7. Sept. 9, 2025
    Permits Microsoft files for a federal air operating permit covering the campus State agency · Oct. 2026
  8. Jan. 23, 2026
    Permits The air operating permit application is updated; no permit has issued State agency · Oct. 2026
  9. Feb. 4, 2026
    Site Epoch AI lists about 75 MW running and no more visible construction
  10. Sept. 21, 2026
    Permits Gov. Abbott directs Texas regulators to halt data-center permits until ERCOT completes an audit State agency · Oct. 2026
Construction activity

Building activity by quarter

Since Nov. 2017: 4 building permits (4 pending or open). Job values are not added up: trade permits often repeat the whole project's value.

Building permits
’18
Dot size: records in the quarter, largest = 2. Two-digit years mark each first quarter.
The buildings

Specs

17 engines
diesel backup units at SAT40, claimed under a Texas permit-by-rule
State agency · Oct. 2026
98.26 tons/yr
nitrogen oxide cap for the whole campus's engines
State agency · Oct. 2026
7 buildings
on the campus air permit record (SAT09-13, 40, 46)
State agency · Oct. 2026
158 acres
land owned at the campus (press)
News report · Oct. 2026
Other data centers within 40 km (20)
This campus (footprint)
33 ac
ALE061 Data Center
62 ac
12807 Donop Rd Data Center
10 ac
7400 Potranco Rd Data Center
9 ac
San Antonio 3 Data Center
3 ac
Iron Mountain
3 ac
Who is involved

Owners, partners and builders

Owner and operator
  • Microsoft Corporation: owner and operator of record
Power
  • CPS Energy: city-owned utility serving the site
  • ERCOT: grid operator
Regulators
  • Texas Commission on Environmental Quality: air permits
  • Texas Department of Licensing and Regulation: building registration
Builders and advisers
  • Page Southerland Page: design firm
  • SEVA EHS: prepared the air permit application
Builders on site
  • The Brandt Companies, Llc. Umb: 2 building permits
  • Hoffman Construction CO of Ame: 1 building permit
Still unknown

Open questions

Where this comes from

84 records from 11 documents

Drawn from news reports, state agency records, public and commercial datasets and local government records, each kept with its date and source. The bar shows documents by type.

News report 5State agency 3Dataset 3Local government 1
Evidence

Every quote behind this page

Grade key: A = the primary record itself (permit, filing, exhibit) · B = a dated official statement · C = news reporting. Map distances are our own measurements on OpenStreetMap and carry no grade. Allegations in lawsuits are marked as such in the quotes.

Power (14)
  • TCEQ campus record lists diesel-fired emergency generators (multiple Caterpillar/Cummins models) supporting the combined SAT09-13/40/46 campus under Permit by Rule 106.511. Engine counts and ekW ratings are backup equipm
    “is a data center supported by the following dieselfired emergency generators authorized under Permitby Rule 106.511:”
    State agency · Oct. 2026 · grade A
  • Power plan: grid (CPS Energy / ERCOT) with on-site diesel backup generation
    “All generators are Tier 2 certified and intended for operation as emergency-only engines in accordance with applicable federal and state regulations”
    State agency · Oct. 2026 · grade A
  • On-site generation: 53.3 MW
    “SAT40 12 x 4376 bhp Caterpillar C175-16 Engines 4 x 5647 bhp Caterpillar C175-20 Engines 1 x 762 bhp Caterpillar C15 Engine”
    State agency · Oct. 2026 · grade A
  • Backup generator units sat40: 17 units
    “SAT40 12 x 4376 bhp Caterpillar C175-16 Engines 4 x 5647 bhp Caterpillar C175-20 Engines 1 x 762 bhp Caterpillar C15 Engine”
    State agency · Oct. 2026 · grade A
  • Campus-wide backup fleet under the single TCEQ regulated entity: 172 diesel engines totalling 437.5 MW nameplate across 7 buildings (SAT09-13, SAT40, SAT46). SAT40's own share (53.3 MW) is the figure booked in campus fac
    “The engines are associated with seven (7) different buildings within the campus, referred to as SAT09, SAT10, SAT11, SAT12, SAT13, SAT40 and SAT46”
    State agency · Oct. 2026 · grade A
  • Third-party estimate on an unstated basis; no Microsoft, CPS Energy, TDLR or TCEQ source denominates SAT40 load, so no M
    “Facility Name: SAT40 Data Center”
    State agency · Feb. 2026 · grade A
  • Grid operator: ERCOT
    “Governor Greg Abbott today directed the Texas Commission on Environmental Quality (TCEQ) to halt all permits sought by data centers until the Electric Reliability Council of Texas (ERCOT) completes its audit”
    State agency · Oct. 2026 · grade B
  • Utility: CPS Energy (city-owned municipal utility, San Antonio) - general area supply; no SAT40-specific service record found
    “The far West Side is known for its abundance of cheap and reliable power supplied by the public utility, CPS Energy”
    News report · Oct. 2026 · grade C
  • Utility: CPS Energy
    “Microsoft has a notable footprint in the city, with eight data centers in operation and development across the city, representing over $1.2 billion in investment”
    News report · Oct. 2026 · grade C
  • Utility service: not stated
    “Microsoft has a notable footprint in the city, with eight data centers in operation and development across the city, representing over $1.2 billion in investment”
    News report · Oct. 2026 · grade C
  • Epoch AI snapshot: 2 buildings operating, 106 MW planned, site already completed with no more visible construction. Epoch's 2-building scope does not match the state record (SAT40 = 1 registered building; the TCEQ campus
    “Site has already been completed”
    grade C
  • CPS Energy plans upwards of $1.3B in transmission and generation over the next five years to serve data-center growth across San Antonio. System-level figure only - never booked as campus MW.
    “Texan municipal electric utility CPS Energy estimates it will spend upwards of $1.3 billion on transmission and generation projects over the next five years”
    News report · Oct. 2026 · grade C
  • IT capacity: 75 MW
    “Site has already been completed”
    grade C
  • Stated campus size: 106 MW
    “Site has already been completed”
    grade C
Money and contracts (13)
  • Tenants: Microsoft (self)
    “Owner Name: Microsoft Owner Address: One Microsoft Way Redmond, Washington 98052”
    State agency · Oct. 2026 · grade A
  • Tenant status: owner-occupied
    “TENANT Not Assigned”
    State agency · Oct. 2026 · grade A
  • Project cost: 175900000 USD
    “Estimated Cost: $175,900,000 Type of Work: New Construction”
    State agency · Oct. 2026 · grade A
  • Tax abatement / incentive agreement: finding - no executed agreement located
    “Microsoft has identified a site consisting of 44 acres of land located in the Westover Hills development located at 5150 Rogers Road”
    Local government · Oct. 2026 · grade A
  • Land purchase (recorded deed): contract value USD
    “Recorded: Dec. 9, 2015 · Grantee: MICROSOFT CORP · Address: 000 ADDRESS EXCEPTION · City: CITY EXCEPTION”
    County deed records · Dec. 2015 · grade B
  • SAT46 (79,385 sq ft) and SAT09-13 share the 15000/15434 Lambda Drive Texas Research Park campus with SAT40
    “It owns 158 acres of land at the campus in the Texas Research Park, where it plans to spend $1 billion building one million square feet of data center space.”
    News report · Oct. 2026 · grade C
  • Land area: 158 acres
    “It owns 158 acres of land at the campus in the Texas Research Park, where it plans to spend $1 billion building one million square feet of data center space”
    News report · Oct. 2026 · grade C
  • Campus plan investment: 1000000000 USD
    “It owns 158 acres of land at the campus in the Texas Research Park, where it plans to spend $1 billion building one million square feet of data center space”
    News report · Oct. 2026 · grade C
  • Land purchase: scope 158 acres
    “It owns 158 acres of land at the campus in the Texas Research Park, where it plans to spend $1 billion building one million square feet of data center space”
    News report · Oct. 2026 · grade C
  • Land purchase: investment plan 1000000000 USD
    “It owns 158 acres of land at the campus in the Texas Research Park, where it plans to spend $1 billion building one million square feet of data center space”
    News report · Oct. 2026 · grade C
  • Electric service agreement: finding - no public ESA or contracted load
    “Texan municipal electric utility CPS Energy estimates it will spend upwards of $1.3 billion on transmission and generation projects over the next five years”
    News report · Oct. 2026 · grade C
  • Press: Microsoft's Texas Research Park plan is $1B for 1M sq ft on 158 acres; SAT46 (79,385 sq ft, $140M) was filed in March 2021 and SAT40 followed in 2023 under TDLR registration TABS2023013247.
    “It owns 158 acres of land at the campus in the Texas Research Park, where it plans to spend $1 billion building one million square feet of data center space”
    News report · Oct. 2026 · grade C
  • Announced: Dec. 11, 2015
    “Microsoft reportedly looks to break ground in the coming months on an eight-building data center campus of over 1 million square feet.”
    News report · Dec. 2015 · grade C
Permits and government (12)
  • air permit-by-rule / Title V site record (campus-wide, includes SAT40): Campus listed with diesel-fired emergency generators authorized under Permit by Rule 106.511; sitewide emissions capped
    “The engines are associated with seven (7) different buildings within the campus, referred to as SAT09, SAT10, SAT11, SAT12, SAT13, SAT40 and SAT46.”
    State agency · Oct. 2026 · grade A
  • Architectural Barriers project registration: registered - review complete
    “Project Name: SAT40 Project Number: TABS2023013247 Facility Name: SAT40 Data Center Location Address: 15000 Lambda Drive”
    State agency · Oct. 2026 · grade A
  • Permit-by-Rule authorization: claimed
    “3MW40-1 155872 106.511 1/26/2024 3MW40-12 155872 106.511 1/26/2024 4MW40-13 155872 106.511 1/26/2024 0.5MW40-17 155872 106.511 1/26/2024”
    State agency · Oct. 2026 · grade A
  • Permit-by-Rule authorization: claimed
    “The generators are supported by diesel storage tanks within a 2000 - 15,000-gallon size range authorized under Permit-by-Rule 106.472”
    State agency · Oct. 2026 · grade A
  • Federal Operating Permit (Title V) application: initial application submitted
    “C. Submittal Date (mm/dd/yyyy): 09/09/2025”
    State agency · Oct. 2026 · grade A
  • Federal Operating Permit (Title V) application: application update submitted
    “The application was submitted on 2026-01-23 at 11:05:35 CST”
    State agency · Oct. 2026 · grade A
  • building registration (new construction): Registered; current status Review Complete
    “Site and building shell data center including administrative components and data center.”
    State agency · June 2023 · grade A
  • Governor Abbott directed TCEQ to halt all data-center permits until ERCOT completes its audit. This campus's operative authorizations predate the halt (PBR claims Jan. 26, 2024) and its Title V application was filed in 2025
    “Until they do, TCEQ will issue no permits sought by data center projects.”
    State agency · Oct. 2026 · grade B
  • building permit: Mechanical permit application: filed
    “Permit number: 2344441 · Type: Mechanical permit application · Status: filed · Effective date: Feb. 26, 2018 · Business: The Brandt Companies, Llc. Umb · Address: 15000 Lambda Dr · Description: Mechanical permit for microsoft data center(s) sat10. To include commercial chillers ahu's rtu's ef's cra”
    Local building-permit records · Feb. 2018 · grade B
  • building permit: Mechanical permit application: filed
    “Permit number: 2340224 · Type: Mechanical permit application · Status: filed · Effective date: Feb. 23, 2018 · Business: The Brandt Companies, Llc. Umb · Address: 15000 Lambda Dr · Description: Mechanical permit for microsoft data center(s) sat9. To include commercial chillers ahu's rtu's ef's crac”
    Local building-permit records · Feb. 2018 · grade B
  • building permit: Commercial single building: filed
    “Permit number: A2152995 · Type: Commercial single building · Status: filed · Effective date: Nov. 15, 2017 · Business: Jorge G Gonzalez · Address: 15000 Lambda Dr · Description: Foundation frame/shell & interior finish out only for building 10 (sat 10) - overall projects consists of two data center”
    Local building-permit records · Nov. 2017 · grade B
  • building permit: Commercial single building: suspended
    “Permit number: AM2125935 · Type: Commercial single building · Status: suspended · Effective date: Nov. 15, 2017 · Business: Hoffman Construction CO OF AME · Address: 15000 Lambda Dr · Description: Site work and underground utilities for microsoft sat 09 & 10 only - overall project consists of two d”
    Local building-permit records · Nov. 2017 · grade B
Site and other (22)
  • Campus context: SAT40 is one building of the Microsoft SAT Campus (SAT09-13, 40, 46) at Texas Research Park, Lambda Drive
    “The Microsoft SAT Campus - SAT09-13, 40, 46 (registered currently as the SAT 09/10 facility) at 15434 Lambda Drive, San Antonio TX 78245 is a data center”
    State agency · Oct. 2026 · grade A
  • Campus name: Microsoft SAT40
    “Facility Name: SAT40 Data Center”
    State agency · Oct. 2026 · grade A
  • Developer: Microsoft Corporation
    “Owner Name: Microsoft Owner Address: One Microsoft Way Redmond, Washington 98052”
    State agency · Oct. 2026 · grade A
  • Owner entity: Microsoft Corporation
    “Full legal name of the applicant: Legal Name Microsoft Corporation Texas SOS Filing Number 10404606”
    State agency · Oct. 2026 · grade A
  • Address: 15000 Lambda Drive, San Antonio, TX 78245
    “Location Address: 15000 Lambda Drive San Antonio, TX 78245 Location County: Bexar”
    State agency · Oct. 2026 · grade A
  • Regulated entity address: 15434 Lambda Drive, San Antonio, TX 78245
    “Physical Address Number and Street 15434 LAMBDA DR City SAN ANTONIO State TX ZIP 78245 County BEXAR”
    State agency · Oct. 2026 · grade A
  • City: San Antonio
    “Location Address: 15000 Lambda Drive San Antonio, TX 78245 Location County: Bexar”
    State agency · Oct. 2026 · grade A
  • County code: Bexar County, TX (48029)
    “Physical Address Number and Street 15434 LAMBDA DR City SAN ANTONIO State TX ZIP 78245 County BEXAR”
    State agency · Oct. 2026 · grade A
  • Coordinates: 29.414005, -98.802941
    “Latitude (N) 29.414005 Longitude (W) -98.802941”
    State agency · Oct. 2026 · grade A
  • Stage: operating
    “The application was submitted on 2026-01-23 at 11:05:35 CST”
    State agency · Oct. 2026 · grade A
  • Original target date: Sept. 15, 2023
    “Start Date: 6/15/2023 Completion Date: 9/15/2023 Current Status: Review Complete”
    State agency · Oct. 2026 · grade A
  • Current target date: Sept. 15, 2023
    “Start Date: 6/15/2023 Completion Date: 9/15/2023 Current Status: Review Complete”
    State agency · Oct. 2026 · grade A
  • First announced: June 2023
    “Start Date: 6/15/2023 Completion Date: 9/15/2023 Current Status: Review Complete”
    State agency · Oct. 2026 · grade A
  • Building sq ft: 153227 sq ft
    “Scope of Work: Site and building shell data center including administrative components and data center. Square Footage: 153,227 ft 2”
    State agency · Oct. 2026 · grade A
  • Buildings in campus record: 7 buildings
    “The engines are associated with seven (7) different buildings within the campus, referred to as SAT09, SAT10, SAT11, SAT12, SAT13, SAT40 and SAT46”
    State agency · Oct. 2026 · grade A
  • Sitewide NOx cap: 98.26 tpy
    “Sitewide emissions have been capped as follows under Registration # 155872”
    State agency · Oct. 2026 · grade A
  • Project status: operating - SAT40 shell completed 2023 within the operating Microsoft Texas Research Park (Lambda Drive) campus; fit-out/occupancy not separately documented in this light pass
    “Site and building shell data center including administrative components and data center.”
    State agency · Sept. 2023 · grade A
  • County code: 48029
    “Location County: Bexar”
    State agency · June 2023 · grade A
  • Operator: Microsoft
    “Owner Name: Microsoft”
    State agency · June 2023 · grade A
  • Address: 15000 Lambda Drive, San Antonio, TX 78245
    “Location Address: 15000 Lambda Drive”
    State agency · June 2023 · grade A
  • Building sq ft: 153227 sq ft
    “Square Footage: 153,227 ft 2”
    State agency · June 2023 · grade A
  • Construction stage: operating
    “Site has already been completed”
    grade C

Imagery and records: County deeds and building permits: ATTOM.