Microsoft is seeking approval to build 15 additional data centers in Mount Pleasant, expanding its footprint in southeastern Wisconsin with two new campuses valued at more than $13 billion.

The proposed expansion, first reported by BizTimes and confirmed by Microsoft, would build on land the company purchased in 2024 and comes as the tech giant is already investing more than $7 billion in two data center projects in the village. Microsoft is also planning a separate data center campus in Kenosha.

“These preliminary plans are the next step in our yearslong development process and we look forward to sharing more about our specific plans as we go forward,” a Microsoft spokesperson said in an email, as reported by Wisconsin Public Radio.

The plans are currently under review by Mount Pleasant’s planning commission. According to village officials, the two campuses would be developed on land acquired from both the village and private property owners. (RELATED: Milwaukee Officials Say ICE Surge Rumors Lack Evidence)

Planning documents show Microsoft submitted updated site plans for two locations. The first, along Durand Avenue, represents the initial phase of a campus with a taxable value exceeding $7.97 billion. That development would include nine data centers, a 96,000-square-foot office building and related facilities, spanning roughly 5.2 million square feet across 791 acres.

A second campus proposed for International Drive carries a taxable value of more than $5.3 billion. That site would feature six data centers, a 74,000-square-foot office and other buildings, totaling more than 3.5 million square feet on about 530 acres. (RELATED: Hispanic Waukesha School Board Candidate Says Ethics Complaint Is Baseless, Steps Back From Campaign)

Both developments would be located within tax increment financing districts. Village officials estimate the Durand Avenue campus would generate approximately $45 million annually in village revenue once district debts are paid, while the International Drive campus would generate around $30 million per year. Planning documents state the projects are expected to produce “far more tax revenue than (required) in adjacent public infrastructure liability and public service costs to the village.”

The planning commission has recommended approval of the site plans, contingent on several conditions. Microsoft must complete traffic impact analyses, as each campus is expected to generate 1,000 or more vehicle trips per day, and comply with all state and local regulations governing water use.

If approved, Microsoft would next submit detailed engineering plans followed by building permit applications. Village officials said the company has not provided a timeline for construction, pending the outcome of the site plan review.

The expansion comes amid growing scrutiny of the energy and water demands of large-scale data centers. Microsoft has previously said its Mount Pleasant facilities would use up to 8.4 million gallons of water annually at full buildout, a figure the company confirmed would include the proposed expansion unless additional approvals are required.

Last week, Brad Smith, Microsoft’s president and vice chair, said he supports regulation of data centers and a proposed “Very Large Customer” electricity rate from We Energies.

“We want to pay a higher price so that our data center does not increase the price of electricity for consumers,” Smith told WPR.