Project Cornmaze Data Center (Towns of Beloit and Turtle) Panattoni Data Centers
Rock County, WI
Viridian GM/JATCO Site Data Center (Janesville)
Viridian Acquisitions. Withdrawn. 800 MW.
Viridian Acquisitions proposed an 8 billion dollar, 11 building, 800 megawatt data center campus on the city owned former GM/JATCO auto plant site, which closed in 2008. After a 4,000 signature petition and months of packed public meetings, the Janesville City Council voted unanimously in June 2026 to let its letter of intent with Viridian expire, ending the specific proposal. Voters will still decide a November 3, 2026 referendum requiring a citywide vote before any future project over 450 million dollars can be approved on the site's undeveloped portions.
- Status
- Withdrawn
- Operator
- Not disclosed
- Applicant on record
- Viridian Acquisitions
- Location
- 1000 General Motors Drive, Janesville, WI, Rock County, WI
- Size
- 800 MW, 250 acres
- Cooling
- Not reported
- Utility
- Alliant Energy
- Next hearing
- November 3, 2026, Janesville voters (referendum)
- Last updated
- June 25, 2026
Sources
- Janesville scraps data center plans with Viridian Acquisitions, Spectrum News 1, 2026-06-25
- 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, Ballotpedia News, 2026-02-12
What it would mean nearby
The cooling design has not been reported. If it uses evaporative cooling, a 800 MW facility would draw roughly 2.5 million to 9.1 million gallons of water a day, about what 29,200 households use.
Meta says the contract means other Alliant customers will not pay for the energy used by its Beaver Dam data center, though consumer advocates say the secrecy around the deal makes that hard for the public to independently verify. Alliant Energy (Wisconsin Power and Light) general rate case for 2026 and 2027 (docket 6680-UR-125) raised residential rates 5.4%, decided November 6, 2025: about $7 to $10 a month on a $160 bill. Transmission upgrades like this are typically billed to every electric customer in the state through transmission charges, not just to the data center that made the new line necessary, which is why the cost allocation question matters for ordinary bills even outside the four counties involved.
For a noise estimate and the three distance rings, check your own address.
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