Central Office AT&T
Rock County, WI
Project Cornmaze Data Center (Towns of Beloit and Turtle)
Panattoni Data Centers. Filed.
A data center code named Project Cornmaze is proposed across more than 430 acres in the Towns of Beloit and Turtle, first pursued under a predevelopment agreement with Cambrin LLC before Panattoni Data Centers took over as developer in April 2026. Cambrin LLC's paperwork shares a name and contact address with filings tied to Meta's confirmed Beaver Dam project, but Meta has not confirmed any role here. After residents raised concerns about NDAs and a lack of transparency, the Town of Beloit board voted June 1, 2026 to require board approval before staff can sign any future nondisclosure agreement.
- Status
- Filed
- Operator
- Panattoni Data Centers
- Applicant on record
- Panattoni Data Centers
- Location
- , Rock County, WI (approximate, county seat)
- Size
- MW not reported, 430 acres
- Cooling
- Not reported
- Utility
- Alliant Energy
- First reported
- 2025-07
- Last updated
- July 8, 2026
Sources
- Meta signs pre-development agreement for data center in Beloit, Wisconsin, Data Center Dynamics
- Citizens push back on possible data center in Town of Beloit, WUWM, 2026-06-04
What it would mean nearby
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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