Microsoft Fairwater Wisconsin
Running (some may still be expanding)
Microsoft Fairwater Wisconsin is an AI data center in Mount Pleasant, Wisconsin, developed or operated by Microsoft for OpenAI, Microsoft. Satellite imagery shows its computers drawing about 369 MW today, against 2.3 GW planned.
U.S. average: 18.2¢ (+3.4%).
Statewide context, not this project’s effect: prices move for many reasons. Source: U.S. Energy Information Administration.
- Tax incentive: Redirected (Sep 29, 2026, Village of Mount Pleasant)
- Utility & power: Approved (Apr 2026, Wisconsin Public Service Commission (unanimous))
Satellite figures are Epoch AI estimates from imagery of buildings, cooling and power equipment; about 80% fall within a factor of 1.4 of the true value.
- May 13, 2028ScheduledSatellite analysis by Epoch AI · 2.3 GW planned
Buildings 3-11 are estimated to be operational. The grading for this revised 9-building plan was underway in May 2026, and we assume an average 2-year build time from that point.
- Feb 20, 2027ScheduledSatellite analysis by Epoch AI · 737 MW planned
Building 2 is operational. This is estimated based on (1) the delay between Building 1 and Building 2 starting land clearing, (2) in March 2025, a Microsoft spokesperson said “fully on track” with the first phase , where “southern datacenter buildings complete, and preparation begins for operations” was expected by late 2026. Finally, while it's not 100% consistent with our estimates, MISO was planning 1480 MW of load for Microsoft in Mount Pleasant in 2026.
- May 15, 2026Satellite analysis by Epoch AI · 369 MW in use
The main shell of Building 2 looks almost completed. In Area 2 (northwest of Buildings 1-2), the grading for the original design has been replaced with grading for the new 9-building design, making way for Buildings 3-11. Work continues on the northern substation in Area 2.
- Apr 16, 2026Satellite analysis by Epoch AI · 369 MW in use
Building 1 is operational. X post from Microsoft saying this date for Fairwater becoming operational.
- Jan 28, 2026Satellite analysis by Epoch AI · 0 MW in use
Building 1 looks complete, but based on Microsoft announcements, it's not fully operational yet. Steel framing is underway for Building 2.
- Sep 26, 2025Satellite analysis by Epoch AI · 0 MW in use
Building 1 cooling and backup generators all look complete from above but there is still construction visible around the building. Building 2 is well underway with a foundation and a complete substation. Large carpark and concrete area north of Building 2. Building 3 has a concrete foundation and a substation underway.
- Jul 14, 2023Satellite analysis by Epoch AI · 0 MW in use
Land clearing begins for Building 1.
Decisions and allocations
- RedirectedTax incentive· Sep 29, 2026 · City
Village of Mount Pleasant
Site sits in Tax Incremental District No. 5 (created for Foxconn). A 42% incremental tax rebate capped at $5M/year was redirected by Microsoft back to the village.
wpr.org - ApprovedUtility & power· Apr 2026 · State
Wisconsin Public Service Commission (unanimous)
Rate plan requiring data centers to pay 100% of the cost of infrastructure built to serve them.
civicmedia.us
| Chip | Designer | Units | As of | Count is |
|---|---|---|---|---|
| B200 | Nvidia | 176,391 | Apr 16, 2026 | Estimate |
Source: Epoch AI, AI data centers, CC BY 4.0
Satellite and capacity estimates via Epoch AI (CC BY 4.0)
- Microsoft blog with engineering details blogs.microsoft.com
- Microsoft blog with more general information blogs.microsoft.com
- Construction Permit Application for building 1 drive.google.com
- Plan for 9-building and 6-building expansions drive.google.com
- OpenAI article mentioning they use Microsoft's Fairwater supercomputers openai.com
- Epoch AI calculation sheet for this site
Satellite estimates: Epoch AI, CC BY 4.0, reformatted for this page.