This is a source-attributed discovery row. It can help you find a place and its citations; it is not a DataCenterData finding that the facility is distinct or currently operating.
Reported geography
Source-reported location for APECS Data Center Campus (Former GM Assembly Plant).
Approximate source coordinates; this is not a parcel claim. Nearby source points are combined into one accessible target that opens this exact map scope. View these exact rows on the interactive map →
Source row snapshot
- Operator as published
- Viridian Acquisitions LLC
- Address and locality
- Janesville · Rock County · Wisconsin
- Official metro area
- Janesville-Beloit, WI
- Source-reported status
- proposed
- Provider facility type
- data center
- Reported capacity
- Planned: 800 MW (source-reported; boundary not independently verified; MW measure not stated by provider)
- Source freshness
- 18 August 2026
- Location precision
- approximate
- Compute Atlas confidence label
- confirmed (provider's classification; not a DataCenterData check)
- Stable directory ID
dcd-dir-001552
Reported details
Source-reported by Compute Atlas; not independently verified by DataCenterData. Provider wording is kept; long provider notes are shortened and marked …; unknown is not zero; none of these values is totaled, ranked or compared.
- Land area
- 250 acres (source-reported; parcel boundary not established)
- Announced investment
- $8 billion
- Announced jobs
- 600 permanent · 1,200 construction
- Community response
- Provider label: contested
- AI-use label (provider)
- likely
- Announced
- November 2025
Provider notes
Community. More than 20 residents spoke against the proposal at the November 2025 council meeting; a Nov. 3, 2026 Janesville ballot initiative would require voter approval for projects over $450 million at the GM/JATCO site.
What the source record says
Redevelopment of the 250-acre former General Motors assembly plant (demolished 2019), a DNR-cleanup brownfield. Two configurations are under evaluation: an 11-building data center campus or an 8- or 9-building hyperscale campus, drawing up to 800 MW. Utility is Alliant Energy. The end user has not been disclosed. Coordinates are the geocoded former GM plant site, not a parcel-confirmed footprint.
Any MW value is reproduced as source-reported context. Its measurement boundary is not established consistently enough for comparison. Unknown is not zero.
Status history supplied by the source
- 2025-11-11 · source-reported proposed
Janesville City Council voted 5-2 to approve a non-binding letter of intent, opening a 120-day negotiation window with Viridian.
Sources and attribution
These sources are listed for the whole row. Unless a figure links to its own source, the provider does not mark which one gave it, so a figure may not appear in every source.
- Janesville moves forward with data center plans for abandoned GM site · Wisconsin Public Radio
- APECS Data Center Campus — project record · Baxtel
- The Rock County data center fight: Janesville's three proposals · 608 Scanner
Adapted from Compute Atlas by Edward Kubiak, edition 1.34.1, under CC BY 4.0. Upstream ID viridian-apecs-janesville-wi. Filtered to data-center records in the 50 U.S. states; selected fields normalized for search and display; DataCenterData directory IDs added. Some locations in this layer are reported by the provider as derived from OpenStreetMap (© OpenStreetMap contributors, ODbL, https://www.openstreetmap.org/copyright) and Epoch AI (CC BY 4.0).
Compute Atlas 1.34.1 with retained prior rows and publication holds. This is a DataCenterData composite, not an unmodified publisher edition. This row uses the captured source from 1.34.1, source as of 2026-10-14T20:40:52.293Z.
That does not mean the row is wrong, and it does not mean no reviewed record exists for the same place. A link is added only when an identifier or source establishes the match.
Recorded information
What this page records, grouped by topic, with the source's units and qualifications. Company-reported values stay labeled as company-reported. Related listings are shown separately.
Licensed directory listing dcd-dir-001552
Licensed directory row.
Provider notes and the source narrative are printed on this page and are not repeated here.
Identity and relationships
- Provider facility type: data center
Provider facility type.
- AI-use label (provider): likely
Compute Atlas classification, not a DataCenterData finding.
Location and precision
- Janesville, WI · Rock (Approximate location)
Roles
- Operator: Viridian Acquisitions LLC
Operator label as published by the provider; no parent company is inferred.
Lifecycle
- Source-stated status: source-reported proposed
Provider status label; not a DataCenterData finding that the facility is operating.
- Announced: November 2025
Provider-reported announcement date.
- Status history: 2025-11-11 · source-reported proposed
Status history supplied by the source.
Area, acreage and buildings
- Land area: 250 acres (source-reported; parcel boundary not established)
Power capacity
- Reported capacity: Planned: 800 MW (source-reported; boundary not independently verified; MW measure not stated by provider)
Reproduced as the page prints it; not ranked or totaled; unknown is not zero.
Permits, incentives, jobs and proceedings
- Announced investment: $8 billion
Announced figure; whether it covers one building, a campus or a multi-phase program is not established.
- Announced jobs: 600 permanent · 1,200 construction
Announced figures; whether they cover one building, a campus or a multi-phase program is not established.
- Community response: Provider label: contested
Compute Atlas characterization, not a DataCenterData assessment.
Sources, dates, limitations and corrections
- Provider update date: 2026-08-18
Provider update date is not a DataCenterData verification date.
Not yet recorded here: Cooling, water, PUE and WUE · Connectivity · Services · Certifications and design ratings · Rack density · Availability · Specification links and contact.
Licensed values: adapted from Compute Atlas by Edward Kubiak under CC BY 4.0. Source-reported and not independently verified.
Update this profile with a public source. The request includes topics needing more information; this does not mean the facility lacks them. Corrections and additions are reviewed before publication.