# Microsoft Fairwater AI Datacenter — Mount Pleasant

MISO data center · https://askthegrid.com/assets/facilities/microsoft-fairwater-ai-datacenter-mount-pleasant

Microsoft Fairwater is an operating and expanding AI data-center campus in Mount Pleasant, Wisconsin, within MISO and the We Energies service territory. Microsoft completed the first facility in June 2026 for large-scale AI training, while an adjacent second facility is under construction for planned completion in 2028 and another area remains in early site work. Public records distinguish the operating facility’s reported load from much larger campus interconnection figures, including a 1,480 MW large-load figure identified by MISO for 2026.

## Identity and location

- Operating status: expanding
- Asset scope: campus
- Location: 4800 90th Street, Mount Pleasant, Racine County, Wisconsin
- Developer: Microsoft (campus)
- Operator: Microsoft (campus)

## Power and grid context

- Utility service: 58.75 MW · operating · exact asset — Public facility listing reports 58.75 MW of power capacity for the operational Microsoft Mount Pleasant site.
- Critical it load: 35.25 MW · operating · exact asset — Public facility listing reports 35.25 MW of IT load for the operational site; this is not treated as total campus power capacity.
- Interconnection request: 450 MW · reported · phase · Phase 1 — Reported Phase 1 load figure in the Wisconsin regulatory record for Microsoft Mount Pleasant.
- Interconnection request: 1,480 MW · reported · campus · as of 2026 — MISO large-load announcement lists Microsoft Mount Pleasant, Wisconsin, at 1,480 MW for 2026. This is kept separate from the reported Phase 1 figure and the operational-site listing.
- ISO/RTO: Midcontinent Independent System Operator (MISO)
- Balancing authority: Midcontinent Independent System Operator (MISO)
- Electric utility: Wisconsin Electric Power Company, operating under the trade name We Energies
- Point of interconnection: Mount Pleasant Substation, through a 138-kV connection; a separate customer-side POI identifier was not publicly identified.
- Substation: Mount Pleasant Substation. The broader Western Feed project also includes the planned Jupiter and Cosmos 345-kV substations, but the direct Fairwater point of interconnection is not separately identified in the public record.
- Interconnection voltage: 138 kV

## Development

- Site status: Operating and expanding: the first Fairwater facility is fully operational; the adjacent second facility is under construction with completion scheduled for 2028; a further future area is in preliminary earthwork/site preparation.
- Site area: 315 acres
- Gross floor area: 1,200,000 square feet
- Buildings: 3
- Construction: Microsoft’s Fairwater campus at 4800 90th Street comprises a 315-acre initial site. The initial project was announced in 2023; site preparation began in June 2023, construction commenced in August 2023, and foundation work began in November 2023. The first Fairwater facility was completed and became fully operational on June 23, 2026; equipment was brought online and startup activities were conducted in April 2026. An adjacent second facility began construction-related site expansion work in November 2025 and is scheduled for completion in 2028. Preliminary earthwork and site preparation are also underway for a third future area at Durand Avenue and Hewitt Memorial Drive. Wisconsin DNR records list active construction permits for the exact 4800 90th Street facility; permit scope is not treated as completed or operating capacity.

## Compute and operations

- Facility classes: hyperscale, cloud, ai_hpc
- Workloads: AI training, running large-scale artificial-intelligence models and applications
- Operating context: Microsoft's purpose-built Fairwater AI datacenter campus in Mount Pleasant is operating and expanding. The first facility became fully operational in June 2026 after equipment startup in April; an adjacent second facility is under construction and scheduled for completion in 2028.

## Sources

- [Sales tax break helped spur Microsoft's Mount Pleasant ...](http://bizjournals.com/milwaukee/news/2023/11/13/microsoft-corp-mount-pleasant-data-center.html)
- [http://blogs.microsoft.com/blog/2025/09/18/inside-the-worlds-most-powerful-ai-datacenter](http://blogs.microsoft.com/blog/2025/09/18/inside-the-worlds-most-powerful-ai-datacenter)
- [Microsoft to expand Mount Pleasant data center project](http://finance-commerce.com/2025/08/microsoft-mount-pleasant-data-center-expansion)
- [Gateway Technical College's Datacenter Academy Strengthens Workforce Pathways for Wisconsin – Greater Racine County](http://greaterracinecounty.com/gateway-technical-colleges-datacenter-academy-strengthens-workforce-pathways-for-wisconsin)
- [Mount Pleasant datacenter project update - Microsoft Local](http://local.microsoft.com/blog/mount-pleasant-datacenter-project-update) — Microsoft Local
- [Microsoft announces $3.3 billion investment in Wisconsin to spur artificial intelligence innovation and economic growth - Source](http://news.microsoft.com/source/2024/05/08/microsoft-announces-3-3-billion-investment-in-wisconsin-to-spur-artificial-intelligence-innovation-and-economic-growth)
- [http://news.microsoft.com/source/2026/06/23/microsoft-completes-construction-on-first-datacenter-facility-in-mount-pleasant-wisconsin](http://news.microsoft.com/source/2026/06/23/microsoft-completes-construction-on-first-datacenter-facility-in-mount-pleasant-wisconsin)
- [http://news.microsoft.com/source/features/ai/from-wisconsin-to-atlanta-microsoft-connects-datacenters-to-build-its-first-ai-superfactory](http://news.microsoft.com/source/features/ai/from-wisconsin-to-atlanta-microsoft-connects-datacenters-to-build-its-first-ai-superfactory)
- [PSC Overhauls We Energies' Data Center Tariff, Makes Improvements to Protect Existing Customers](http://psc.wi.gov/Documents/PressReleases/04.24.2026PressRelease.PDF)
- [DOR Qualified Data Center Exemption](http://revenue.wi.gov/Pages/FAQS/ExemptionforQualifiedDataCenter.aspx)
- [NOTICE OF PUBLIC HEARING: Microsoft Data Centers | Sturtevant WI](http://sturtevant-wi.gov/administration/page/notice-public-hearing-microsoft-data-centers)
- [Key Facts](http://we-energies.com/company/key-facts)
- [Boldt Co. aims to play active role in state's data center development | WisBusiness](http://wisbusiness.com/2025/boldt-co-aims-to-play-active-role-in-states-data-center-development)
- [Sturtevant residents file class action suit over Microsoft data center noise • Wisconsin Examiner](http://wisconsinexaminer.com/briefs/mount-pleasant-residents-file-class-action-suit-over-microsoft-data-center-noise) — Wisconsin Examiner · 2026-07-02
- [Made in Wisconsin: The world’s most powerful AI datacenter - Microsoft On the Issues](https://aka.ms/WIdatacenter)
- [Public Notice](https://apps.dnr.wi.gov/warp_ext/AM_DownloadObject.aspx?id=1184282)
- [Public Notice](https://apps.dnr.wi.gov/warp_ext/AM_DownloadObject.aspx?id=1192690)
- [Public Notice](https://apps.dnr.wi.gov/warp_ext/AM_DownloadObject.aspx?id=1262713)
- [Permit Tracking](https://apps.dnr.wi.gov/warp_ext/am_permittracking2.aspx?id=35961)
- [Case Management System - Docket Detail](https://apps.psc.wi.gov/APPS/dockets/content/detail.aspx?id=137&case=CE&num=209)
- [Inside the world’s most powerful AI datacenter - The Official Microsoft Blog](https://blogs.microsoft.com/blog/2025/09/18/inside-the-worlds-most-powerful-ai-datacenter/)
- [Made in Wisconsin: The world’s most powerful AI datacenter - Microsoft On the Issues](https://blogs.microsoft.com/on-the-issues/2025/09/18/made-in-wisconsin-the-worlds-most-powerful-ai-datacenter/) — Microsoft On the Issues · 2025-09-18
- [LARGE LOAD FACILITY ADDITIONAL INFORMATION: Existing Large Load and New Load Additions Announced in MISO South, Central and North Regions.](https://cdn.misoenergy.org/NEW%20LOAD%20ANNOUNCEMENTS%20IN%20MISO%20REGIONS%2012062024684954.pdf)
- [Press Release: Gov. Evers, Microsoft Officials Announce New $4 Billion Investment in Mount Pleasant Datacenter](https://content.govdelivery.com/accounts/WIGOV/bulletins/3f327b5)
- [Measuring energy and water efficiency for Microsoft datacenters - Microsoft Datacenters](https://datacenters.microsoft.com/sustainability/efficiency)
- [Microsoft Corporation Data Center Construction (24-MIN-238) And Operation Permit (25230249A-F03) Public Hearing | Wisconsin DNR](https://dnr.wisconsin.gov/calendar/hearing/100736) — Wisconsin DNR · 2024-11-20
- [Notice Of Public Hearing | Wisconsin DNR](https://dnr.wisconsin.gov/calendar/hearing/121621) — Wisconsin DNR · 2026-04-10
- [Public Hearing for Microsoft MKE 09-14 Wetland Individual Permit Application | Wisconsin DNR](https://dnr.wisconsin.gov/calendar/hearing/99371)
- [Medium](https://itnext.io/inside-azures-ai-superfactory-how-fairwater-turns-every-gigawatt-into-useful-tokens-413bf8470d7e)
- [Mount Pleasant datacenter project update - Microsoft Local](https://local.microsoft.com/blog/mount-pleasant-datacenter-project-update/)
- [Microsoft datacenters in Wisconsin](https://local.microsoft.com/wp-content/uploads/2025/10/Microsoft-datacenters-in-Wisconsin.pdf)
- [Thank you for joining the Racine County open house and presentation about the Microsoft datacenter projects](https://local.microsoft.com/wp-content/uploads/2026/06/Boards-Mount-Pleasant-6.2.pdf)
- [Microsoft's Fairwater Wisconsin: The Flagship AI Data Center, Built on Foxconn's Foundations](https://measuredai.substack.com/p/microsoft-fairwater-wisconsin-data-centers)
- [Demanding Data Center Transparency - City of Racine | Midwest Environmental Advocates | Legal Services | Policy](https://midwestadvocates.org/our-work/legal-action/demanding-transparency-about-the-environmental-impacts-of-data-centers)
- [April 14, 2026 Mr. Quinton LeSage Wisconsin Department of Natural Resources, Bureau of Air Management, 101 S. Webster Street, Box](https://midwestadvocates.org/wp-content/uploads/Vantage-Air-Permit-Comment-Sierra-Club.pdf)
- [Microsoft Signs Power Purchase Agreement for Portage Solar](https://nationalgridrenewables.com/press-release/national-grid-renewables-signs-power-purchase-agreement-with-microsoft/)
- [Microsoft announces $3.3 billion investment in Wisconsin to spur artificial intelligence innovation and economic growth - Source](https://news.microsoft.com/source/2024/05/08/microsoft-announces-3-3-billion-investment-in-wisconsin-to-spur-artificial-intelligence-innovation-and-economic-growth/)
- [Microsoft completes construction on first datacenter facility in Mount Pleasant, Wisconsin - Source](https://news.microsoft.com/source/2026/06/23/microsoft-completes-construction-on-first-datacenter-facility-in-mount-pleasant-wisconsin/) — Microsoft Source · 2026-06-23
- [Microsoft closes on 1,030 acres of land in Mount Pleasant; company is now largest land owner in TID 5 | Racine County Eye](https://racinecountyeye.com/2023/12/22/microsoft-1030-acres-mount-pleasant/)
- [Microsoft in Racine County – News & Updates – RCEDC](https://rcedc.org/microsoft-in-racine-county/) — Racine County Economic Development Corporation

## Data quality

- The exact site is corroborated by Wisconsin DNR records identifying Microsoft Mount Pleasant Data Centers at 4800 90th Street, Mount Pleasant, Racine County, with FID 252302490.
- Benefits and investment figures are primarily Microsoft-reported claims, although the Racine County economic-development source independently reports employment, investment, construction, and workforce-development information.
- The noise lawsuit allegations are not adjudicated findings. The complaint identifies the facility at 4800 90th Street and alleges private nuisance and negligence.
- 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/microsoft-fairwater-ai-datacenter-mount-pleasant
Profile generated: 2026-08-30T19:46:40.137307Z
Source: Ask the Grid — https://askthegrid.com/