Data center fact sheet · county
Rock County, Wisconsin
As of . Latest dated change shown: Jun 22, 2026. Source: Data Center Census (datacentercensus.com), CC BY 4.0.
- Tracked projects
- 2
- 1 proposed, 1 cancelled
- Planned capacity
- None published
- 0 projects publish a figure; 1 project publishes none; 1 cancelled or denied not counted
- Moratorium actions
- 0
- Upcoming hearings
- 0
Projects
| Project | Status | Planned capacity | Developer |
|---|---|---|---|
| Viridian Data Center Campus (former GM/JATCO site) Janesville | Cancelled | 800 MW | Viridian Partners (Viridian Acquisitions LLC) |
| Project Cornmaze Beloit | Proposed | none published | Panattoni |
Pauses and local rules
No moratorium action on record.
Upcoming votes and hearings
No upcoming hearing on record. Agendas change; check with the body before attending.
Latest changes
- Jun 22, 2026 Panattoni holds an invite-only gathering on the project (Project Cornmaze)[1]
- Jun 2026 Panattoni says the Town of Turtle board postponed a cost reimbursement agreement that had been set for its June 9 meeting (Project Cornmaze)[2]
- Jun 2026 City Council votes not to extend the letter of intent with Viridian (Viridian Data Center Campus (former GM/JATCO site))[3]
- May 2026 Panattoni informs local government it is taking over the project (Project Cornmaze)[2]
- Mar 5, 2026 Pre-development agreement for Project Cornmaze becomes public (Project Cornmaze)[4]
- Feb 9, 2026 City Council places a citizen initiative requiring voter approval for projects over $450 million at the GM/JATCO site on the Nov. 3, 2026 ballot (Viridian Data Center Campus (former GM/JATCO site))[5]
Notes
Planned capacity adds each record’s first published figure for projects not cancelled or denied; projects that publish none are never estimated. IT load is the power reaching computing equipment, so a total that includes it understates total power. Locations may be approximate where a record gives only a town or county. Counts cover tracked projects, not every data center.
Sources
- WIFR / Rockford News First, “Data center developer sheds light on $1B Beloit project raising community concern”, Jun 22, 2026. https://www.rockfordnewsfirst.com/2026/06/23/data-center-developer-sheds-light-1-billion-beloit-project-raising-community-concern/
- DCD, “Developer Panattoni seeks to claw back cash from town of Turtle, Wisconsin, for 430-acre data center”, Jun 9, 2026. https://www.datacenterdynamics.com/en/news/developer-panattoni-seeks-to-claw-back-cash-from-town-of-turtle-wisconsin-for-430-acre-data-center/
- WMTV 15 News, “Janesville seeks public input on former GM/JATCO site redevelopment”, Jun 26, 2026. https://www.wmtv15news.com/2026/06/27/janesville-seeks-public-input-former-gmjatco-site-redevelopment/
- DCD, “Meta signs pre-development agreement for data center in Beloit, Wisconsin”, Mar 5, 2026. https://www.datacenterdynamics.com/en/news/meta-signs-pre-development-agreement-for-data-center-in-beloit-wisconsin/
- Ballotpedia News, “Janesville, Wisconsin, voters to decide Nov. 3, 2026, initiative requiring approval for development projects exceeding $450 million at GM/JATCO site, such as proposed data center”, Feb 12, 2026. https://news.ballotpedia.org/2026/02/12/janesville-wisconsin-voters-to-decide-nov-3-2026-initiative-requiring-approval-for-development-projects-exceeding-450-million-at-gm-jatco-site-such-as-proposed-data-center/
Each project record lists all of its sources and excerpts. Cite as: Data Center Census, “Data center fact sheet: Rock County, Wisconsin,” October 14, 2026, https://datacentercensus.com/fact-sheets/wisconsin/rock-county.