Microsoft Three Mile Island Energy Supply
Constellation Energy has proposed a 835 MW data center in Dauphin County, Pennsylvania (proposed). One source reports this facility in the Kapwork Grow tracker.
- Capacity
- 835 MW
- Investment
- $1.6B
- Expected completion
- 2028
- Reported jobs
- 627
Who's on this build
Named in the cited sources. No source reports who builds it.
Operator
Constellation Energy
Schedule
Dates as reported. Not a bid calendar. A planned date is not evidence that work occurred.
- in 2 yr
Expected completionPlanned
- Today
Proposed
Last material change Sep 24, 2026.
- last year
Construction start
- ~2 yr ago
Announced
- ~2 yr ago
Event date: · First observed: Not reported
Reported updates without an event date
Reported for 2028.
Event date: Not reported · First observed: Not reported
Reported for 2025.
Event date: Not reported · First observed: Not reported
Record quality
- Datasets
- 1
- Summary
- From published records
- Source as of
- Last material change
Site and infrastructure
SC Server CountryKW Kapwork Grow tracker record
Status
- Operator
- Constellation Energy
- Tenants
- Microsoft
- Stage
- Proposed
- Facility type
- AI data center
Scale
- Reported capacity
- 835 MW
- Reported investment
- $1.6B
- Reported jobs
- 627
Reported dates
- Announced
- 2024-09-20Reported date — see the source for the event evidenced.
- Construction start reported
- 2025
- Expected completion
- 2028
Site
- City
- Londonderry Township
- County
- Dauphin County
- State
- Pennsylvania
Power and cooling
- AI workload
- AI or machine-learning workload reported
Permits and public records
- Incentives reported
- Other; $1,000,000,000
Sources, method and limits
Show 1 sourceHide
What each source reports
| Dataset | Reported name | Reported status | Reported MW |
|---|---|---|---|
| Server Country | Microsoft Three Mile Island Energy Supply | Proposed | 835 MW |
Sources and evidence
- SCServer Country project record (CC BY 4.0)As of: Sep 24, 2026 · Record: 0434
- KWKapwork Grow tracker record, merged from the sources listed here (free account)As of: Sep 23, 2026 · Record: 52925224207951
Limitations and interpretation
- This record is the Kapwork Grow tracker's merged view of a facility, from the tracker snapshot built 2026-09-23. Facts tagged KW are the tracker's resolved values; the per-source rows it was merged from are listed under Sources and on the tracker record.
- Sources on this record: Server Country, https://servercountry.org/data/ (CC BY 4.0). Every source is licensed for commercial use with attribution.
- An announced or permitted build is not a contract, an open bid or a purchase order.
- Capacity figures are as reported by the cited sources and may describe planned rather than energised capacity.
Cite or correct this record
Kapwork Grow, “Microsoft Three Mile Island Energy Supply”, https://kapwork.com/grow/directory/datacenters/microsoft-three-mile-island-energy-supply-pa-dc_30229d30464f, materially updated Sep 24, 2026.
Report an error in this record and we will check it against the cited sources.
An announced or permitted build is not a contract, an open bid or a purchase order. Capacity and dates are as reported by the cited sources. “Not reported” means missing information, not zero. Completed and withdrawn records can remain available as historical records.
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