Data Center Site Selection in Wisconsin

Wisconsin was not a traditional data center market. That changed when Microsoft began building in Mount Pleasant, south of Milwaukee, on land assembled for the earlier Foxconn project. Microsoft has described its Fairwater AI campus there as one of its most powerful, with three buildings and about 1.2 million square feet on 315 acres, and it has pledged a second campus of similar scale, bringing its stated Wisconsin investment to more than $7 billion.¹

In October 2025, Vantage Data Centers announced Lighthouse, a roughly $15 billion campus in Port Washington, north of Milwaukee, to host OpenAI and Oracle workloads as part of the Stargate program. It is planned at close to 1 GW across four buildings.²¹⁰ By early 2026, further billion-dollar proposals were emerging elsewhere in the state while lawmakers and regulators debated who should pay for the power they need.¹¹

The draw is a mix of large industrial parcels near Lake Michigan, a cool climate that suits free cooling, a regulated utility system willing to build generation, and a sales tax exemption that dates to 2023. The constraints are equally real: rising scrutiny from regulators and residents, generation that must be built rather than found, and water rules unlike those in most states. For how these factors compare across the Midwest, see our guide to MISO data center site selection.

We Energies proposed its Very Large Customer (VLC) and Bespoke Resources tariffs in 2025 after several large data center prospects entered its service territory.³ The Public Service Commission of Wisconsin approved them on April 24, 2026, but with substantial changes pushed by intervenors.³¹² As approved, the framework:

• Lowers the eligibility threshold to 100 MW, well below the level We Energies proposed, so mid-sized campuses fall under it.³
• Requires a minimum initial contract term of 15 years.³
• Drops a proposed capacity-only option under which a customer would have paid for 75% of a generating plant’s cost, leaving a full-benefits model in which the customer pays 100% of the costs of resources built for it.³
• Adds reporting requirements so the commission and the public can see how the tariff and individual agreements work in practice.³

For site selection, the tariff means that a campus in We Energies territory is effectively paying for new generation and grid upgrades as a condition of service, and committing to it for a long period. That shifts the analysis from “is there spare capacity?” to “can the project carry a dedicated resource portfolio and a 15-year commitment?” Trade press has read the decision as a likely template for other Midwestern commissions.¹² Our guide to large-load tariffs and electric service agreements explains the common terms, such as minimum bills, contract demand and exit fees.

Wisconsin’s data center wave is being served largely by new generation. In May 2025 the PSC unanimously approved about $1.5 billion of We Energies gas plants, an 1,100 MW plant in Oak Creek and a 128 MW plant in the Town of Paris in Kenosha County, with cost caps and other conditions. Demand from the Microsoft campus was a major factor in the case, and the plants are expected online in 2027 and 2028.¹³

For Port Washington, Vantage has said it is paying for about 2,000 MW of new supply, including wind and solar, while the campus itself needs roughly 1,400 MW.¹⁴ That pattern, where the developer funds a portfolio larger than its own load, is what the Bespoke Resources structure was designed to handle.

On the transmission side, Wisconsin is in MISO. MISO’s board approved the $21.8 billion Long Range Transmission Planning Tranche 2.1 portfolio in December 2024, 24 projects with a 765 kV backbone that extends into Wisconsin.⁵ Those lines still need state siting approval and will take years to build, so they matter for a campus planned for the 2030s more than for near-term power.

2023 Wisconsin Act 19, the state budget, created a sales and use tax exemption for qualified data centers, effective October 1, 2023. It covers tangible personal property used exclusively to develop, construct, renovate or repair a qualified data center, such as servers, networking gear and other hardware, whether or not the property becomes part of the real estate.⁴

The Wisconsin Economic Development Corporation certifies projects, and the exemption applies only to purchases after WEDC’s certification date. The project must reach a minimum qualified investment within five years of certification, scaled by county population.⁴⁷

The lower thresholds in small counties give rural sites a modest advantage on paper, though at hyperscale the threshold is rarely the binding issue. Because certification precedes eligibility, sequence matters: apply early, before major equipment orders. Our state-by-state sales tax exemption comparison puts Wisconsin’s program in context, and a tax advisor should confirm eligibility for any specific project.

Much of eastern Wisconsin’s appeal is Lake Michigan, but the Great Lakes Compact bans diversions of basin water outside the basin, with narrow exceptions. The basin boundary near the lake’s southwest shore runs close to the shoreline, so parcels only a few miles inland can sit outside it. Mount Pleasant qualifies as a “straddling community,” one of the exceptions, which is how the Wisconsin DNR in 2018 approved Racine drawing up to 7 million gallons a day for the former Foxconn development.⁶

Records released by Racine in 2025 put Microsoft’s first-phase peak at about 234,000 gallons per day, or 2.8 million gallons a year, rising to 702,000 gallons per day and 8.4 million gallons a year in later phases.⁶ Microsoft says more than 90% of its Fairwater facility will use closed-loop liquid cooling, with outside air for the rest and water only on the hottest days.¹ For a new site, check three things early: which side of the basin divide the parcel is on, whether the serving water utility has an approved diversion or headroom, and whether the design can stay within those limits. Our guide to municipal water and sewer capacity covers the utility side.

In January 2026 the Assembly passed AB 840, 53–44, which would have required closed-loop cooling, annual water-use reporting to the DNR and protections against shifting utility costs to other ratepayers.⁸ The Senate adjourned its 2025–26 floor session in March 2026 without voting on that bill or a competing Democratic version.⁹ As of this review, Wisconsin has no statewide data center siting law beyond the tax exemption and PSC tariff authority, which leaves most land-use decisions with villages, cities, towns and counties.

Local processes have drawn close public attention as proposals multiply.¹¹ Expect rezoning, development agreements and tax incremental financing to be negotiated locally, and expect questions about water, noise and electric rates at every hearing. Our guides to community engagement and development agreements cover how to prepare.

1. 01Identify the electric utility and its large-load terms. In We Energies territory, test the project against the 100 MW threshold, the 15-year term and full cost responsibility.³
2. 02Find the nearest 345 kV substation and ask whether MISO Tranche 2.1 projects change the picture for your timeline.⁵
3. 03Map the Great Lakes basin divide and the water utility’s approved supply before assuming lake water is available.⁶
4. 04Confirm county population to know the sales tax investment threshold, and plan WEDC certification ahead of purchases.⁴
5. 05Read local zoning and any recent data center ordinances; with no statewide siting law, local rules govern.⁹
6. 06Check wetlands, floodplain and farmland status; much of southeast Wisconsin’s available acreage is agricultural.

A desktop screen can answer most of these before an option is signed. If you want a second opinion on a parcel, you can get a site reviewed.