Semiconductor CitiesCumming, Iowa
Microsoft Project Osmium
Operating checked 1 Nov 2026
190 MWpower online now
190 MWpeak planned or projected
$7.2Bestimated capital cost, built so far
IAIowa
Facts
- Owner
- Microsoft
- Main user
- OpenAI
- Chips
- A100, H100, B200
Timeline
2018-12-18
Land clearing begins on the north part of the site
2021-01-01
Building 1 and 1st building on the site are operational. Foundation work begins on Building 2
57 MW2023-06-30
Building 2 is operational. Estimated based on Microsoft H100 count 2023
114 MW2025-03-01
Building 3-4 operational, no visible construction.
228 MW2025-10-08
Site already complete.
228 MW2026-06-16
No notable changes since October.
228 MWPast entries are observations; entries marked projected are estimates and can change.
Sources (checked 1 Nov 2026)
- SemiAnalysis article with IT power estimations and detailing usage by OpenAI for training GPT 3.5
- DCD Article on site expansion
- MISO Announcement reporting power for newest buildings, likely an overestimate
- Microsoft article on data centers in Iowa used by OpenAI
- Epoch AI: AI data centers dataset (CC BY 4.0)
Data: Epoch AI, AI data centers dataset, licensed CC BY 4.0. We selected fields, cleaned location names, and added the status label.