Microsoft Project Osmium (West Des Moines)
AI data center in Cumming (West Des Moines), Iowa, operated by Microsoft.
Microsoft's West Des Moines-area AI campus, where the supercomputer OpenAI used for GPT-era training was built. Epoch AI estimates about 190 MW of IT power.
Power: what each source says
Epoch AI estimates 190 MW IT / 228 MW facility as of 2026-06-16. SemiAnalysis ties early OpenAI training runs to this site; Microsoft has described Iowa AI supercomputers used by OpenAI.
Figures labelled Epoch AI are estimates from satellite imagery, permits and filings. Company figures come from the operator, owner or its filings. IT power is what the servers draw; in Epoch AI’s figures for these campuses it runs about 15–35% below total facility power.
Tenants
Part reported Microsoft; OpenAI (speculative, per Epoch AI)
“Reported” means a press outlet or Epoch AI named the tenant and neither the operator nor the tenant has confirmed it. The outlet is named in brackets and listed under sources.
Campus facts
- Operator
- Microsoft 1
- Owner / developer
- Microsoft 1
- City
- Cumming (West Des Moines) 1
- State / region
- Iowa 1
- Country
- United States 1
- First power
- 2021 1
- Chips
- NVIDIA A100, NVIDIA H100, NVIDIA B200 (Epoch AI) 1
- GPUs / accelerators
- Not published
- Cooling
- Not published
- Power source
- Not published
- Coordinates
- 41.48° N, 93.76° W (town level)
- Verified
Sources
- Epoch AI data center profile: Microsoft Project Osmium (CC-BY 4.0) (licence: CC BY 4.0) accessed 2026-11-09
- Epoch AI, AI data centers dataset (CC-BY 4.0, updated 2026-11-06) (licence: CC BY 4.0) accessed 2026-11-09