# Pennsylvania Digital 1 (PAX-1) Data Center Campus

PJM data center · https://askthegrid.com/assets/facilities/pennsylvania-digital-1-pax-1-data-center-campus--grid-load-ef3a4a8f6c60903a

Pennsylvania Digital 1 (PAX-1) is a three-campus hyperscale data center development on about 700 acres in Middlesex Township, Cumberland County, Pennsylvania. It is a joint venture of Pennsylvania Data Center Partners and PowerHouse Data Centers, and the end user has not been disclosed. Site grading began in spring 2026 and PPL Electric has begun work on a new substation. The developer plans 1,350 MW of utility capacity with expandability to 1,800 MW, delivered in stages through 2029.

## Identity and location

- Operating status: under_construction
- Asset scope: campus
- Location: Country Club Road, Carlisle, Cumberland County, PA
- Developer: Pennsylvania Data Center Partners (exact asset)
- Developer: PowerHouse Data Centers (exact asset)

## Power and grid context

- Utility service: 1,350 MW · proposed · exact asset — Developer-stated initial utility capacity with three dedicated substations
- Utility service: Up to 1,800 MW · proposed · exact asset — Expandability ceiling stated by the developer
- Utility service: 450 MW · proposed · exact asset — Dedicated substation per campus, three campuses
- Utility service: 450 MW · approved · exact asset — Township supervisors' March 2026 vote approving a 450 MW substation
- Reported unspecified: 300 MW · target · exact asset — Near-term power delivery in the July 2025 announcement
- Reported unspecified: 450 MW · target · exact asset — First stage of the developer's delivery schedule
- Reported unspecified: 900 MW · target · exact asset — Second stage of the developer's delivery schedule
- Reported unspecified: 1,350 MW · target · exact asset — Third stage of the developer's delivery schedule
- Reported unspecified: 450 MW · target · exact asset — State environmental agency project summary
- ISO/RTO: PJM
- Electric utility: Ppl Electric Utilities Corp
- Point of interconnection: Newly planned PPL 500 kV to 138 kV switching station
- Substation: Each campus is supported by a dedicated 450 MW electrical substation

## Development

- Site area: 693.44 acres
- Buildings: 16

## Compute and operations

- Facility classes: hyperscale

## Sources

- [https://www.pennlive.com/news/2026/10/pax-1-data-center-in-cumberland-county-delays-tenant-reveal-amid-potential-revisions.html](https://www.pennlive.com/news/2026/10/pax-1-data-center-in-cumberland-county-delays-tenant-reveal-amid-potential-revisions.html)
- [www.cumberlandcountypa.gov](https://www.cumberlandcountypa.gov/DocumentCenter/View/54948/Pennsylvania-Digital-PAX-1-Final-SD-Review-Report-2026-03-05)
- [Pennsylvania Digital I Hyperscale Campus | Pennsylvania Data Center Partners](https://www.padatacenters.com/campus)
- [https://middlesextwp.com/wp-content/uploads/2026/07/PC-MINUTES-05-11-2026.pdf](https://middlesextwp.com/wp-content/uploads/2026/07/PC-MINUTES-05-11-2026.pdf)
- [$15 Billion AI Data Center Project in Pennsylvania Clears Key Milestone](https://constructionreviewonline.com/450-mw-substation-approved-for-15b-pennsylvania-digital-i-pax-ai-data-center-in-carlisle/)
- [Pennsylvania Data Center Partners and PowerHouse Data Centers Launch Joint Venture to Build Next-Gen 1.35 GW Hyperscale Data Center Campus in Carlisle, Pennsylvania](https://www.powerhousedata.com/news/pennsylvania-data-center-partners-and-powerhouse-data-centers-launch-joint-venture-to-build-next-gen-1-35-gw-hyperscale-data-center-campus-in-carlisle-pennsylvania)
- [Southcentral Regional Office | Department of Environmental Protection | Commonwealth of Pennsylvania](https://www.pa.gov/agencies/dep/dep-regions/southcentral-regional-office)
- [https://stoppax1.com/files/2026-08-05-cccd-inspection-report-amendment-4.pdf](https://stoppax1.com/files/2026-08-05-cccd-inspection-report-amendment-4.pdf)
- [https://stoppax1.com/files/2026-05-22-eia-excerpt-utility-needs.pdf](https://stoppax1.com/files/2026-05-22-eia-excerpt-utility-needs.pdf)
- [https://files.dep.state.pa.us/RegionalResources/SCRO/SCROPortalFiles/Community%20Info/DataCenters/PAX-1/GP052103226-001%20GP072103225-004%20Wetland%20Road%20Crossing%20Acknowledgement.pdf](https://files.dep.state.pa.us/RegionalResources/SCRO/SCROPortalFiles/Community%20Info/DataCenters/PAX-1/GP052103226-001%20GP072103225-004%20Wetland%20Road%20Crossing%20Acknowledgement.pdf)
- [PA Data Center Partners & Powerhouse Launch 1.35 GW Campus in Carlisle | Pennsylvania Data Center Partners](https://www.padatacenters.com/pennsylvania-data-center-partners-and-powerhouse-data-centers-launch-joint-venture-to-build-next-gen-135-gw-hyperscale-data-center-campus-in-carlisle-pennsylvania)
- [https://services3.arcgis.com/OYP7N6mAJJCyH6hd/arcgis/rest/services/Electric_Retail_Service_Territories_HIFLD/FeatureServer/0/query?f=json&where=1%3D1&geometry=-77.11522%2C40.25522&geometryType=esriGeometryPoint&inSR=4326&spatialRel=esriSpatialRelIntersects&outFields=ID%2CNAME&returnGeometry=false](https://services3.arcgis.com/OYP7N6mAJJCyH6hd/arcgis/rest/services/Electric_Retail_Service_Territories_HIFLD/FeatureServer/0/query?f=json&where=1%3D1&geometry=-77.11522%2C40.25522&geometryType=esriGeometryPoint&inSR=4326&spatialRel=esriSpatialRelIntersects&outFields=ID%2CNAME&returnGeometry=false)

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Profile generated: 2026-11-02T21:33:23.436825Z
Source: Ask the Grid — https://askthegrid.com/