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Last Update: 10/27/2026 at 5:34 AM EST
Data Centers and Energy in Wisconsin
Coverage from Wispolitics, Wisconsin Public Radio, and others
Large data-center projects in places such as Mount Pleasant, Port Washington, and Beaver Dam are shaping Wisconsin’s electricity planning.
Utilities and state regulators are addressing how to serve their substantial loads, including through special rates and financial safeguards intended to assign costs and risks to the customers driving new investment. The decisions also affect transmission and generation plans, including proposals for new natural-gas capacity, and raise questions about reliability, household bills, pollution, and local impacts.
Looking Back
135 Day Timeline
May 7
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All Articles60 articles
Important
Wisconsin's Public Service Commission approved a Very Large Customer tariff in April requiring large data centers to cover infrastructure costs, while We Energies proposed additional generation and storage cost allocations.
8/31/2026 • Power Procurement & Grid • General
Midwest Environmental Advocates sued Wisconsin DNR in Ozaukee County Circuit Court on behalf of Sierra Club Wisconsin over Lighthouse data center campus permits lacking a full environmental impact statement.
7/10/2026 • Permitting & Regulation • General
Dane County Circuit Judge Stephen Ehlke ordered Wisconsin's Public Service Commission to release Meta Beaver Dam data center load projections in Madison, Wisconsin, on August 17.
8/18/2026 • Permitting & Regulation • General
Sierra Club sued Wisconsin DNR over environmental approval for the Vantage data center after internal records indicated an Environmental Impact Statement was initially expected.
7/11/2026 • Permitting & Regulation • General
Midwest Environmental Advocates and Sierra Club sued Wisconsin DNR on July 10, seeking to block diesel generator air permits and environmental review for Vantage Data Centers AI campus in Port Washington.
7/10/2026 • Permitting & Regulation • General
American Transmission Co. has reapplied for a multibillion-dollar transmission system across eastern Wisconsin to support Oracle's planned Port Washington data center campus.
9/18/2026 • Power Procurement & Grid • General
Microsoft, Wisconsin regulators, and customer advocates challenged an ATC and We Energies transmission charge agreement for Microsoft's Mount Pleasant data center before federal regulators.
8/27/2026 • Power Procurement & Grid • General
The Public Service Commission of Wisconsin revoked American Transmission Co.'s application determination for a $1.3 billion to $1.7 billion transmission project serving Vantage Data Centers' Port Washington campus.
8/7/2026 • Power Procurement & Grid • General
Scott Lauber said Wisconsin regulators approved special rates for very large data center customers as We Energies planned grid and generation investments for projected gigawatt demand growth.
5/7/2026 • Power Procurement & Grid • General
The Public Service Commission of Wisconsin unanimously revoked American Transmission Company’s application determination for a proposed power-line and substation project serving an AI data center campus in Port Washington.
8/7/2026 • Power Procurement & Grid • General
Wisconsin's Public Service Commission voted Thursday in Wisconsin to restart review of American Transmission Co.'s proposed 100-mile line serving the Stargate data center.
8/7/2026 • Power Procurement & Grid • General
Vantage Data Centers is developing a 1,400-megawatt AI facility in Port Washington, Wisconsin, while regulators and consumer groups debate tariffs, transmission costs, and ratepayer safeguards.
7/30/2026 • Power Procurement & Grid • General
American Transmission Company filed a Wisconsin and FERC transmission-cost allocation plan for Microsoft, Vantage Data Centers, and Meta hyperscale sites, assigning data center-linked transmission costs to owners pending regulator approval.
7/26/2026 • Power Procurement & Grid • General
Clean Wisconsin urged residents to support a petition for a pause on Wisconsin data center approvals while the state adopts comprehensive integrated resource planning and clean electricity rules.
7/15/2026 • Community & Local Opposition • General
Clean Wisconsin said the Wisconsin Public Service Commission rejected reopening of an AI data center special tariff in the We Energies service territory.
7/10/2026 • Power Procurement & Grid • General
Wisconsin regulators approved a large load tariff for new We Energies data center customers, requiring 100% of energy infrastructure cost coverage after local opposition.
7/6/2026 • Power Procurement & Grid • General
Vantage Data Centers and partners filed with the Wisconsin PSC in 2020s to reopen tariff credit and collateral rules affecting Port Washington Lighthouse data-center power procurement.
6/11/2026 • Power Procurement & Grid • General
Vantage Data Centers plans the Lighthouse campus in Port Washington, Wisconsin, while Clean Wisconsin and residents cite backup diesel emissions risks in an ozone nonattainment area.
5/20/2026 • Community & Local Opposition • General
Wisconsin Public Service Commission approved a modified Alliant Energy contract on Thursday to supply electricity for Meta's Beaver Dam data center campus.
5/8/2026 • Power Procurement & Grid • General
Wisconsin PSC approved Alliant Energy and Meta contract terms for a Beaver Dam data center while ordering a standardized framework to protect other customers from future transmission-cost impacts.
5/7/2026 • Power Procurement & Grid • General
Oracle sought reconsideration of a Wisconsin Public Service Commission decision tied to We Energies tariff treatment for a nearly 1 GW Port Washington data center, estimating annual financing costs above $100 million for required power guarantees.
7/21/2026 • Power Procurement & Grid • General
Wisconsin regulators held a July 16 hearing on Invenergy's $564 million, 324 MW Foundry Ridge Energy Center proposal in Darien supporting hyperscale data centers.
7/17/2026 • Community & Local Opposition • General
Wisconsin Public Service Commission rejected a We Energies petition for hyperscale data center financial guarantee relief, leaving collateral requirements for Oracle and other below A- credit users unchanged.
7/10/2026 • Power Procurement & Grid • General
Wisconsin Public Service Commission approved Alliant Energy power terms for Meta's Beaver Dam campus and ordered a standard tariff rule for future 100 megawatt-plus data centers.
5/7/2026 • Power Procurement & Grid • General
Interesting
Vantage is developing the Lighthouse AI data center campus on 672 acres in Port Washington, Wisconsin, while environmental advocates and residents challenge the project's approval and impacts.
7/29/2026 • Community & Local Opposition • General
Vantage Data Centers continued constructing an AI campus for OpenAI and Oracle on Aug. 6 in Port Washington, Wisconsin, amid debate over grid expansion and community protections.
8/25/2026 • Community & Local Opposition • General
Green Homeowners United and Elevate discussed May 27 research in Madison showing Wisconsin residential efficiency upgrades could offset electricity demand from data center growth.
7/22/2026 • Policy & Utility Planning • General
Invenergy and We Energies sought Public Service Commission review of two gas plants in Paris and Darien, Wisconsin, for Oracle and Microsoft data centers amid concerns about limited public scrutiny.
7/14/2026 • Policy & Utility Planning • General
Wisconsin regulators and CUB pushed decisions on AI data center energy cost allocation in Beaver Dam and other markets, including Focus on Energy funding and transmission cost protection planning.
6/8/2026 • Policy & Utility Planning • General
We Energies, Vantage Data Centers, and Cloverleaf Infrastructure filed with the Wisconsin Public Service Commission to amend collateral requirements for data center special rates.
6/15/2026 • Power Procurement & Grid • General
Wisconsin policymakers and residents are evaluating data center growth and infrastructure cost protections as artificial intelligence and cloud demand accelerate across the state.
9/9/2026 • Policy & Utility Planning • General
WEC Energy CEO Scott Lauber said Oracle will meet Wisconsin's financial-security requirements for the Lighthouse data center campus during an earnings call.
7/31/2026 • Project Finance & Incentives • General
We Energies and Oracle asked Wisconsin regulators to modify a data-center special rate collateral rule, affecting Oracle Lighthouse security levels in Port Washington amid opposition.
6/12/2026 • Project Finance & Incentives • General
In Wisconsin, WEC Energy Group CEO Scott Lauber said potential data center customers could add 400 to 500 megawatts as public opposition and tariff disputes grow.
7/30/2026 • Policy & Utility Planning • General
Oracle faces Wisconsin collateral security requirements tied to We Energies for a Port Washington data center, following regulator approval of a $7 billion letter of credit or equivalent security.
7/21/2026 • Project Finance & Incentives • General
Wisconsin PSC maintained We Energies credit-rating financial guarantee rules for large data center customers in April, and Oracle challenged the decision in Ozaukee County Circuit Court in June.
7/10/2026 • Policy & Utility Planning • General
Wisconsin Public Service Commission draft planning projects 40% peak demand growth by 2032, driven largely by hyperscale data centers in Beaver Dam, Port Washington, and Mount Pleasant.
7/7/2026 • Policy & Utility Planning • General
Wisconsin Public Service Commission projects peak electricity load above 20 GW by 2032 as hyperscale data center projects drive demand, with a virtual hearing set for Aug. 20.
7/5/2026 • Policy & Utility Planning • General
Wisconsin Public Service Commission projects peak electricity demand will reach 20 GW by 2032 as hyperscale data centers expand in Beaver Dam, Port Washington, and Mount Pleasant.
7/3/2026 • Policy & Utility Planning • General
Wisconsin utilities project peak demand rising to 20 GW by 2032 as hyperscale data centers expand in Beaver Dam, Port Washington, and Mount Pleasant.
7/2/2026 • Policy & Utility Planning • General
Oracle sued Wisconsin's Public Service Commission on June 19 to challenge a new credit-rating-based collateral requirement for data center electric service in Port Washington.
6/24/2026 • Project Finance & Incentives • General
Clean Wisconsin asked the PSC in Wisconsin to reject a petition to reopen an AI data center tariff case for We Energies, after a May order imposed credit and collateral rules.
6/22/2026 • Policy & Utility Planning • General
We Energies and Oracle petitioned the Wisconsin Public Service Commission in 2020s proceedings to modify collateral requirements for the Lighthouse data center campus in Port Washington.
6/13/2026 • Project Finance & Incentives • General
We Energies asked the Wisconsin PSC to reopen credit-security requirements for data center rate service, targeting Oracle's BBB-rated Port Washington campus financing.
6/12/2026 • Policy & Utility Planning • General
On May 21, the Public Service Commission of Wisconsin issued an order in the We Energies very large customer case affecting power-cost rules for hyperscale data centers.
6/1/2026 • Policy & Utility Planning • General
Alliant Energy told the Wisconsin Public Service Commission in a Beaver Dam rate case that Wisconsin Power & Light received 12 2025 data center proposals, mostly redacted.
5/15/2026 • Policy & Utility Planning • General
Wisconsin PSC ordered Alliant Energy to file standardized data center tariffs above 100 MW after approving a modified Meta Beaver Dam contract.
5/7/2026 • Policy & Utility Planning • General
A Wisconsin judge ordered the Wisconsin Public Service Commission to release Meta's Beaver Dam data center load records after Midwest Environmental Advocates challenged the withholding in August 2026.
9/10/2026 • Policy & Utility Planning • General
Union of Concerned Scientists calls for stronger Wisconsin public-need review as Invenergy and We Energies seek natural gas plant approvals for hyperscale data center-driven load growth later this July.
7/9/2026 • Policy & Utility Planning • General
Wisconsin Public Service Commission draft assessment in June projects a 40% peak-load rise by 2032 driven by hyperscale AI data center buildouts.
7/3/2026 • Policy & Utility Planning • General
Oracle filed a June 19 lawsuit in Ozaukee County to overturn Wisconsin PSC credit-collateral rules for powering the Port Washington AI data-center campus.
6/24/2026 • Policy & Utility Planning • General
We Energies filed a June 10 petition asking Wisconsin regulators to loosen hyperscale data-center financial guarantee rules affecting Oracle’s Port Washington campus.
6/12/2026 • Policy & Utility Planning • General
Port Washington, Wisconsin, construction on a Vantage Data Centers AI campus prompts a letter challenging WE Energies after April Public Service Commission rate protections for credit guarantees.
6/27/2026 • Policy & Utility Planning • General
Oracle and We Energies sought a Wisconsin PSC exemption from ratepayer protections tied to collateral for data-center utility infrastructure if projects fail.
6/11/2026 • Policy & Utility Planning • General
Oracle voluntarily dismissed its Wisconsin lawsuit against the Public Service Commission over financial safeguards for the Lighthouse data center campus in Port Washington.
8/17/2026 • Project Finance & Incentives • General
Oracle voluntarily dismissed its lawsuit against Wisconsin regulators on Aug. 17 in Ozaukee County, leaving credit safeguards and transmission requirements for the Port Washington data center campus in place.
8/17/2026 • Project Finance & Incentives • General
Additional
Oracle withdrew its Wisconsin lawsuit on Aug. 17 in Ozaukee County after challenging financial guarantees tied to electricity service for its planned Port Washington data-center campus.
8/17/2026 • Policy & Utility Planning • General
Power Wisconsin Forward criticized a Wisconsin PSC VLC rate structure modification proposal involving We Energies, Vantage Data Centers, Cloverleaf Infrastructure, and Oracle in Docket 6630-TE-113.
6/11/2026 • Policy & Utility Planning • General
Environmental, public health, and community groups are hosting a Wisconsin webinar before Public Service Commission hearings on proposed gas plants in Darien and Paris.
6/19/2026 • Policy & Utility Planning • General
Oracle dropped its lawsuit against Wisconsin utility regulators after the Public Service Commission strengthened We Energies customer protections for data center-related infrastructure costs.
8/17/2026 • Policy & Utility Planning • General