Legal action
Challenging Inadequate Environmental Review of Vantage's Port Washington Data Center
MEA filed a lawsuit against the Wisconsin Department of Natural Resources on behalf of the Sierra Club over the agency’s decision to issue permits for a massive data center campus in Port Washington without fully evaluating the project’s environmental consequences. The lawsuit seeks answers about the extent to which tech companies and data center developers are influencing decisions that impact Wisconsin’s environment.
Case Summary
On July 10, 2026, Midwest Environmental Advocates filed a lawsuit on behalf of the Sierra Club challenging a Wisconsin Department of Natural Resources (DNR) decision to issue permits for a massive data center campus in Port Washington without fully evaluating the project’s environmental consequences.
The lawsuit was filed after emails obtained through a public records request revealed that DNR staff initially informed data center representatives that a detailed Environmental Impact Statement (EIS) would be required due to the scope and scale of the project. After data center representatives complained that an EIS would “kill the project,” the DNR reversed course and decided to conduct a more limited “environmental analysis summary.” The agency has never publicly explained that decision.
A Project of Unprecedented Scale
The Port Washington data center is unlike anything Wisconsin has seen before. It will completely transform the local landscape, consume staggering amounts of electricity and water and significantly increase fossil fuel emissions.
Vantage Data Centers, Oracle, and OpenAI are building the project as part of a broader effort to expand computing infrastructure for artificial intelligence. It is one of the first hyperscale data centers under construction in Wisconsin. The first phase alone will require an unprecedented 1.3 gigawatts of power—an amount that could power more than half a million households. The data center itself will cover 672 acres, and its energy demand will spur the construction of new gas plants, substations and high-voltage transmission lines that will spread over six counties.
The Need for Full Environmental Review
In comments submitted to the DNR earlier this year, MEA and the Sierra Club urged the DNR to prepare a comprehensive Environmental Impact Statement that would evaluate the data center’s direct, indirect, and cumulative environmental impacts. In particular, they pointed to the inconsistency and lack of transparency regarding the infrastructure needed to support the data center’s extraordinary energy demands.
While the project’s public-facing website and other marketing materials tout renewable energy development, they make little or no mention of the new fossil fuel infrastructure—including the new Foundry Ridge gas plant in Walworth County—that will be built to power the Port Washington data center.
When data center developers aren’t forthright with the public and regulators aren’t willing to hold them accountable, it’s difficult to understand the true environmental impact of a single project, much less the combined impact of multiple hyperscale data centers. The EIS process exists for moments exactly like this. It requires government agencies to step back, examine the whole picture, and explain its decisions. In this case, regulators abandoned environmental review without ever telling the public why.
MEA Attorney Michael Greif
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