Microsoft · Cumming, Iowa

Microsoft Project Osmium

228MW

The power of 190,000 US homes.

Drawing power since Jan 2021.

H100-equivalents: 156K
Capital cost: $7.2B
Chips: A100, H100, B200
Users: OpenAI (unconfirmed)

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This site on the globe

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Every site on the globe

<iframe src="https://jesseahawkins.com/buildout/embed/" title="The AI buildout: the world's largest AI data centers on a globe" width="100%" height="600" style="border:0;max-width:100%" loading="lazy"></iframe>

Each frame credits Epoch AI and links back to its page. Preview it.

Cite

This page

Jesse Hawkins, “Microsoft Project Osmium · The AI buildout”, jesseahawkins.com, data retrieved 22 Oct 2026. https://jesseahawkins.com/buildout/microsoft-project-osmium/. Data: Epoch AI, “AI data centers”, CC BY 4.0.

BibTeX

@misc{hawkins2026buildoutmicrosoftprojectosmium,
  author = {Hawkins, Jesse},
  title = {{Microsoft Project Osmium · The AI buildout}},
  year = {2026},
  howpublished = {\url{https://jesseahawkins.com/buildout/microsoft-project-osmium/}},
  note = {Data: Epoch AI, ``AI data centers'', CC BY 4.0, retrieved 2026-10-22}
}

The data · Epoch AI

Epoch AI, 'AI data centers'. Published online at epoch.ai. Retrieved from 'https://epoch.ai/data/ai-data-centers' [online resource]. CC BY 4.0.

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Power over time

facility power · 6 milestones

Every milestone

18 Dec 2018 — Land clearing begins on the north part of the site
1 Jan 2021 57 MW Building 1 and 1st building on the site are operational. Foundation work begins on Building 2
30 Jun 2023 114 MW Building 2 is operational. Estimated based on Microsoft H100 count 2023
1 Mar 2025 228 MW Building 3-4 operational, no visible construction.
8 Oct 2025 228 MW Site already complete.
16 Jun 2026 228 MW No notable changes since October.

Gas made 37% of the power on this site's grid

net generation by fuel · Oct 2025 to Sep 2026

Midcontinent Independent Transmission System Operator, Inc. MISO · balancing authority

Gas 37%
Coal 26%
Nuclear 14%
Wind 15%
Solar 6%
Hydro 1%
Other 1%

The grid of the utilities that serve Warren County, IA. Each grid is a balancing authority. Generation only; imports are excluded. Every grid behind an AI site.

No new plant is planned in Warren County

power plants in Warren County · EIA-860M, September 2026

In service in Warren County today: 44 MW. Since January 2023: 3 MW added, 0 MW retired. A plant in the same county does not mean it feeds the site. Power plants near every AI site.

Sources

selected by Epoch AI

Data: Epoch AI, “AI data centers”, CC BY 4.0, retrieved 22 Oct 2026. Facility power adds cooling and other overhead to the IT power the servers draw. Placed at the centre of Cumming. Grid: U.S. Energy Information Administration, Hourly Electric Grid Monitor (Form EIA-930), public domain, retrieved 16 Oct 2026; utilities by county from Form EIA-861 and the U.S. Census Bureau Geocoder, public domain. Power plants: U.S. Energy Information Administration, Form EIA-860M, public domain, inventory as of September 2026. All sources.