Microsoft Project Osmium

OperatingEst.AI campusCampusCumming, Warren County, Iowa

Microsoft Project Osmium is an operating ai campus in Cumming, Iowa. Operated or owned by Microsoft. Current power: 228 MW (estimated). Verification: verified operating. 11 cited sources.

70% profile completeness

45 claims from 11 sources

Last verified against sources: Oct 12, 2026

Newest dated evidence: Jun 16, 2026

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Cite this

Text

Datacenter Source. “Microsoft Project Osmium.” /facilities/microsoft-project-osmium-cumming-ia. Data as of 2026-10-12. Accessed 2026-10-12.

BibTeX

@misc{datacentersource_microsoft_project_osmium_cumming_ia_2026,
  title = {{Microsoft Project Osmium}},
  author = {{Datacenter Source}},
  year = {2026},
  howpublished = {\url{/facilities/microsoft-project-osmium-cumming-ia}},
  note = {Data as of 2026-10-12; accessed 2026-10-12. Compiled from cited sources, including OpenStreetMap contributors (ODbL) and Epoch AI (CC BY 4.0)},
}

Please also cite the original source of any specific figure (linked beside it).

Current facility power

228 MW[1]

Est.Likelyestimated

Planned capacity

Not yet sourced

Floor area

Not yet sourced

Buildings (planned)

4[1]

Est.Likelyderived

Capital cost / investment

$7.2B[1]

Est.Likelyestimated

First operational

Jan 1, 2021[1]

Est.Likelyderived

POWER & GRID

Time-to-power · verification · interconnection

Time to power

Energized — operating

High confidence

Project verification

Verified operating

Operation documented by satellite imagery.

Current stage

Operational

Furthest stage with documented evidence

Utility · ISO

MidAmerican Energy · MISO

Substation: On-site substation

Power reality

Announced

No record

Interconnection request

No record

Contracted / approved

No record

Under construction

No record

Operational

228 MW[1]

Estimated from buildings observed operational

AI evidence brief

Summarizes only the evidence on this page. Answers citing anything else are rejected automatically.

Project verification

Development

Announcedimplied by a later stage
Land acquiredimplied by a later stage
Planning / zoningimplied by a later stage
Permittingimplied by a later stage

Grid interconnection

Interconnection application
Feasibility study
System impact study
Facilities study
Interconnection agreement / service contract

Build & energization

Financing
Under constructionDec 18, 2018
Model estimate · Satellite imagery
- Dec 18, 2018 · Reported status: under construction[1]
- Dec 18, 2018 · Construction start[1]
- Dec 18, 2018 · Land clearing begins on the north part of the site[1]
- Jan 1, 2021 · Reported status: expanding[1]
EnergizationJan 1, 2021
Satellite imagery
- Jan 1, 2021 · Building 1 and 1st building on the site are operational. Foundation work begins on Building 2[1]
- Jun 30, 2023 · Building 2 is operational. Estimated based on Microsoft H100 count 2023[1]
- Mar 1, 2025 · Building 3-4 operational, no visible construction.[1]
OperationalJan 1, 2021
Satellite imagery
- Jan 1, 2021 · Building 1 and 1st building on the site are operational. Foundation work begins on Building 2[1]
- Jun 30, 2023 · Building 2 is operational. Estimated based on Microsoft H100 count 2023[1]
- Mar 1, 2025 · Building 3-4 operational, no visible construction.[1]

● documented · ◌ implied by a later stage · ○ no evidence found. Dates are those of the earliest dated evidence, which can be later than when a stage actually began. Evidence classes: Model estimate, Satellite imagery.

Grid path

facility
Microsoft Project Osmium
→
substation
On-site substation[1]
Satellite imageryLikely
1 substation outline traced inside the campus on satellite imagery
→
transmission
161 kV line[5]
Proximity onlyUnverified
Highest-voltage line mapped within 2 km (0.26 km away). Not confirmed as the supply path.
→
utility
MidAmerican Energy[2]
Service territoryLikely
Retail service territory containing the site
→
ISO / RTO
MISO[4]
Service territoryLikely
Balancing authority: MISO

Substation capacity:: not published
Required upgrades:: not yet sourced
Congestion:: not yet sourced (no nodal price data)

Dashed boxes are based on proximity only and do not establish which asset serves the site.

Interconnection records

No interconnection-queue record is linked to this site. Of the ISOs we ingest, only NYISO publishes large-load requests; PJM, ERCOT, MISO, SPP and CAISO queues list generation only.

On-site & dedicated generation

No on-site, behind-the-meter or dedicated generation found in sources.

LOCAL IMPACT

Water · generation · incentives · regulation · rates

Water & cooling

Not yet collected: we haven't found a source for water use or the cooling type at this site. Know one? Add a source

On-site generation & air permits

Not yet collected: we haven't found a source for on-site generation or an air permit for this site. Know one? Add a source

Incentives

Not yet collected: we haven't found a source for tax abatements, PILOTs or other incentives for this project. Know one? Add a source

Regulatory events

Not yet collected: we haven't found a source for hearings, rezonings, permits or commission proceedings. Know one? Add a source

Utility & rates

Not yet collected: we haven't found a source for a large-load tariff or commission docket for MidAmerican Energy. Know one? Add a source

Location & imagery

Mapped outline

Coordinates: 41.49637, -93.78742
Address: 5855 SW Kerry St, Cumming, IA 50061[1]Est.Modeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure. As of Jun 16, 2026.Likely
County: Warren County

Photographs

No openly licensed ground-level photos matched to this site yet.

Ownership, operation & customers

1. Property owner of record
Not identified
2. Owner / developer
Microsoft[1]
3. Operator
Not identified
4. Tenant / cloud
Not identified
5. End customer / workload
OpenAI[1]Speculative

Power supply

Utility:

MidAmerican Energy[2]Unverified

Each link is sourced separately. The property owner of record is often a special-purpose entity; the same company appearing in two roles is shown only when sources say so.

All parties with evidence

Owner: Microsoft[1]Confirmed
End user: OpenAI[1]Speculative
Utility: MidAmerican Energy[2]Unverified
Most likely retail provider among 2 overlapping service territories (largest retail sales; territory polygons are approximate). Also overlapping: Clarke Electric Coop INC - (Ia).

Power (all fields)

Current facility power: 228 MW[1]Est.Modeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure. As of Jun 16, 2026.Likelyestimated
Estimated total facility power (IT plus cooling and overhead) at the latest observed milestone.
Current IT capacity: 190 MW[1]Est.Modeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure. As of Jun 16, 2026.Likelyestimated
Estimated IT load currently online, based on buildings observed operational.
Estimated annual consumption: 1,398 GWh/yr[3]Est.Modeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure. As of Oct 12, 2026.Speculativeestimated
228 MW × 8,760 h × 70% utilization.
Planned capacity: Not yet sourced

Capacity figures are nameplate or contracted; annual consumption is a labeled model estimate, not metered data.

Grid & electricity

ISO / RTO: MISO[4]Est.Modeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure.Likelyderived
Location falls inside this ISO/RTO footprint.
Balancing authority: MISO[2]Est.Modeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure.Likelyderived
Control area of the containing utility territory.
Nearest mapped substation: Microsoft Project Osmium Data Center (161 kV)[5]Est.Modeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure. As of Sep 28, 2026.Likelyderived
Nearest substation mapped in OpenStreetMap; proximity does not establish which substation serves the site.
Distance to substation: 0.6 km[5]Est.Modeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure. As of Sep 28, 2026.Likelyderived
Highest-voltage line nearby: 161 kV[5]Est.Modeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure. As of Sep 28, 2026.Likelyderived
Highest-voltage transmission line mapped within 2 km.
State avg. industrial price: 9.99¢/kWh[6]ConfirmedBacked by a filing, deed, permit, interconnection-queue record, or a government or utility record. As of Jul 2026.Confirmed
Iowa statewide average, July 2026.
State avg. commercial price: 13.27¢/kWh[6]ConfirmedBacked by a filing, deed, permit, interconnection-queue record, or a government or utility record. As of Jul 2026.Confirmed
Iowa statewide average, July 2026.
Generation within 50 km: 1.46 GW[7]Est.Modeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure. As of Jan 1, 202502.Confirmedderived
18 EIA-reported plants within 50 km.
Interconnection status: Not yet sourced
Contracted / committed power: Not yet sourced

Nearby infrastructure	Type	Distance	Voltage / capacity	Source
161 kV line · MidAmerican Energy	Transmission line	0.26 km	161 kV	[5]
River Hills · MidAmerican Energy Co	Power plant (Natural Gas)	17.4 km	113 MW	[7]
Sycamore (Ia) · MidAmerican Energy Co	Power plant (Natural Gas)	21.6 km	141 MW	[7]
Greater Des Moines · MidAmerican Energy Co	Power plant (Natural Gas)	22.6 km	504 MW	[7]
Pleasant Hill · MidAmerican Energy Co	Power plant (Natural Gas)	22.9 km	154 MW	[7]
Indianola · Indianola Municipal Utilities	Power plant (Petroleum)	24.1 km	42 MW	[7]
Arbor Hill Solar · MidAmerican Energy Co	Power plant (Solar)	39.7 km	24 MW	[7]
Arbor Hill Wind Farm · MidAmerican Energy Co	Power plant (Wind)	40.8 km	310 MW	[7]
Macksburg Wind Project · MidAmerican Energy Co	Power plant (Wind)	41.4 km	120 MW	[7]
Microsoft Project Osmium Data Center · MidAmerican Energy	Substation	0.55 km	161 kV	[5]

Utility, ISO and nearby assets are derived from the site's location. Proximity to a substation or line doesn't establish the interconnection; that needs a utility filing or interconnection-queue record. Queue requests are applications, not commitments — most never reach operation.

Construction & permitting

Announced
—
Land acquired
—
Permitting
—
Construction start
Dec 18, 2018[1]
First operational
Jan 1, 2021[1]
Expected completion
—

Buildings (planned): 4[1]Est.Modeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure. As of Jun 16, 2026.Likelyderived
Count of building outlines traced on satellite imagery.
Buildings operational: 4[1]Est.Modeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure. As of Jun 16, 2026.Likelyestimated

Phase	Status	Added MW	Completed / expected	Source
Building 1	operational	57 MW	Jan 1, 2021	[1]
Building 2	operational	57 MW	Jun 30, 2023	[1]
Buildings 3–4	operational	114 MW	Mar 1, 2025	[1]

Real estate

Official assessments

Assessor's value for a tax year

None sourced yet

Recorded transactions

Sale prices from recorded deeds

None sourced yet

Model estimates

Our model — not an appraisal

None sourced yet

Capital cost / investment: $7.2B[1]Est.Modeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure. As of Jun 16, 2026.Likelyestimated
Modeled total capital cost (2025 USD) of capacity currently operational, incl. compute hardware.
Annual property tax: Not yet sourced

No county parcel or assessor records linked yet. County records are currently ingested for Loudoun County, VA and Maricopa County, AZ.

Size

Floor area: Not yet sourced

Compute

Chip types: A100, H100, B200[1]Est.Modeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure. As of Jun 16, 2026.Confirmed
Compute (H100-equivalents): 155,600[1]Est.Modeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure. As of Jun 16, 2026.Likelyestimated

What changed (last 3 years)

Follow this facility (RSS)

Current IT capacity
95 MWJun 30, 2023[1]EstimatedModeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure.→190 MWMar 1, 2025[1]EstimatedModeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure.
Current facility power
114 MWJun 30, 2023[1]EstimatedModeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure.→228 MWMar 1, 2025[1]EstimatedModeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure.
Buildings operational
2Jun 30, 2023[1]EstimatedModeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure.→4Mar 1, 2025[1]EstimatedModeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure.
Status
Operating + expandingJan 1, 2021[1]EstimatedModeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure.→OperatingJun 16, 2026[1]EstimatedModeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure.

Timeline

Construction start: Dec 18, 2018[1]

First operational: Jan 1, 2021[1]

Dec 18, 2018[1]
Land clearing begins on the north part of the site
Jan 1, 202157 MW facility power· 1 buildings operational[1]
Building 1 and 1st building on the site are operational. Foundation work begins on Building 2
Jun 30, 2023114 MW facility power· 2 buildings operational[1]
Building 2 is operational. Estimated based on Microsoft H100 count 2023
Mar 1, 2025228 MW facility power· 4 buildings operational[1]
Building 3-4 operational, no visible construction.
Oct 8, 2025228 MW facility power· 4 buildings operational[1]
Site already complete.
Jun 16, 2026228 MW facility power· 4 buildings operational[1]
No notable changes since October.

Buildings on this campus

MicrosoftOperating · 239,500 sq ft footprint
MicrosoftOperating · 243,900 sq ft footprint
MicrosoftOperating · 242,500 sq ft footprint
MicrosoftOperating · 247,400 sq ft footprint
MicrosoftOperating · 247,400 sq ft footprint

All claims (provenance audit)

Field	Value	Source	Confidence	As of	Status
Name	Microsoft Project Osmium	[1]	Likely	2026-06-16	Shown
Status	Under construction	[1] derived	Likely	2018-12-18	Superseded / alternative
Status	Operating + expanding	[1] derived	Likely	2021-01-01	Superseded / alternative
Status	Operating + expanding	[1] derived	Likely	2023-06-30	Superseded / alternative
Status	Operating + expanding	[1] derived	Likely	2025-03-01	Superseded / alternative
Status	Operating + expanding	[1] derived	Likely	2025-10-08	Superseded / alternative
Status	Operating	[1] derived	Likely	2026-06-16	Shown
Facility type	AI campus	[1] derived	Likely	2026-06-16	Shown
Address	5855 SW Kerry St, Cumming, IA 50061	[1]	Likely	2026-06-16	Shown
Owner	MicrosoftOwner: Microsoft	[1]	Confirmed	2026-06-16	Shown
End users	OpenAIUsers: OpenAI	[1]	Speculative	2026-06-16	Shown
Utility	MidAmerican Energyterritory 12341: MIDAMERICAN ENERGY CO (INVESTOR OWNED, BERKSHIRE HATHAWAY ENERG	[2] derived	Unverified	2022	Shown
Current facility power	228 MW	[1] estimated	Likely	2026-06-16	Shown
Current facility power	57 MW	[1] estimated	Likely	2021-01-01	Superseded / alternative
Current facility power	114 MW	[1] estimated	Likely	2023-06-30	Superseded / alternative
Current facility power	228 MW	[1] estimated	Likely	2025-03-01	Superseded / alternative
Current facility power	228 MW	[1] estimated	Likely	2025-10-08	Superseded / alternative
Current IT capacity	190 MW	[1] estimated	Likely	2026-06-16	Shown
Current IT capacity	48 MW	[1] estimated	Likely	2021-01-01	Superseded / alternative
Current IT capacity	95 MW	[1] estimated	Likely	2023-06-30	Superseded / alternative
Current IT capacity	190 MW	[1] estimated	Likely	2025-03-01	Superseded / alternative
Current IT capacity	190 MW	[1] estimated	Likely	2025-10-08	Superseded / alternative
Estimated annual consumption	1,398 GWh/yr	[3] estimated	Speculative	2026-10-12	Shown
ISO / RTO	MISOMIDCONTINENT INDEPENDENT TRANSMISSION SYSTEM OPERATOR, INC..	[4] derived	Likely	—	Shown
Balancing authority	MISO	[2] derived	Likely	—	Shown
Nearest mapped substation	Microsoft Project Osmium Data Center (161 kV)way/830885772	[5] derived	Likely	2026-09-28	Shown
Distance to substation	0.6 km	[5] derived	Likely	2026-09-28	Shown
Highest-voltage line nearby	161 kV	[5] derived	Likely	2026-09-28	Shown
State avg. industrial price	9.99¢/kWh	[6]	Confirmed	2026-07	Shown
State avg. commercial price	13.27¢/kWh	[6]	Confirmed	2026-07	Shown
Generation within 50 km	1.46 GW	[7] derived	Confirmed	202502	Shown
Buildings (planned)	4	[1] derived	Likely	2026-06-16	Shown
Buildings operational	4	[1] estimated	Likely	2026-06-16	Shown
Buildings operational	0	[1] estimated	Likely	2018-12-18	Superseded / alternative
Buildings operational	1	[1] estimated	Likely	2021-01-01	Superseded / alternative
Buildings operational	2	[1] estimated	Likely	2023-06-30	Superseded / alternative
Buildings operational	4	[1] estimated	Likely	2025-03-01	Superseded / alternative
Buildings operational	4	[1] estimated	Likely	2025-10-08	Superseded / alternative
Capital cost / investment	$7.2B	[1] estimated	Likely	2026-06-16	Shown
Compute (H100-equivalents)	155,600	[1] estimated	Likely	2026-06-16	Shown
Chip types	A100	[1]	Confirmed	2026-06-16	Shown
Chip types	H100	[1]	Confirmed	2026-06-16	Shown
Chip types	B200	[1]	Confirmed	2026-06-16	Shown
Construction start	Dec 18, 2018	[1] derived	Likely	2026-06-16	Shown
First operational	Jan 1, 2021	[1] derived	Likely	2026-06-16	Shown

Sources

[1]
AI data centers (Frontier Data Centers Hub)
Epoch AI · retrieved 2026-10-12 · CC BY 4.0
[2]
Electric Retail Service Territories (HIFLD, from EIA-861)
DHS HIFLD / U.S. EIA (via Esri Living Atlas) · retrieved 2026-09-28 · Public domain
[3]
Annual energy estimate
Datacenter Source (this site)
[4]
Independent System Operators (HIFLD)
DHS HIFLD (via PNNL ArcGIS) · retrieved 2026-09-28 · Public domain
[5]
OpenStreetMap — features tagged telecom=data_center or building=data_center
OpenStreetMap contributors · retrieved 2026-10-12 · ODbL 1.0
[6]
Electric Power Monthly, Table 5.6.A — Average price of electricity to ultimate customers by state (July 2026)
U.S. Energy Information Administration · retrieved 2026-10-12 · Public domain
[7]
Power Plants in the U.S. (EIA-860)
U.S. Energy Information Administration · retrieved 2026-10-12 · Public domain
[8]
SemiAnalysis article
SemiAnalysis
[9]
DCD Article on site expansion
DCD
[10]
MISO Announcement reporting power for newest buildings, likely an overestimate
cdn.misoenergy.org
[11]
Microsoft article on data centers in Iowa used by OpenAI
Microsoft

Record links

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Evidence level: ConfirmedBacked by a filing, deed, permit, interconnection-queue record, or a government or utility record. filing, deed, permit or grid recordAnnouncedStated by the company or reported in the press; not yet backed by a filing or grid record. company or press claimEst.Modeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure. satellite, model or map inferenceHow levels are assigned

derived computed by our pipeline; estimated a model estimate, not a disclosed figure. Methodology →