OpenAI plans to deploy another Stargate data center cluster, this time in Port Washington, Wisconsin.

The project will be developed by the generative AI company, alongside Oracle and Vantage Data Centers, on a site from powered land provider Cloverleaf Infrastructure.

The facility is the 'unnamed site in the Midwest' that OpenAI referenced when it disclosed plans for five Stargate data centers in the US, alongside the existing Abilene, Texas, campus.

The other known projects are in Doña Ana County, New Mexico, and in Shackelford County, Texas. That latter facility is also expected to be from Vantage, with the company working on a 1.4GW campus. Altogether, the US Stargate campuses are planned to grow to 4.5GW of IT capacity.

The Wisconsin site, codenamed Lighthouse, is planned to support 'close to a gigawatt' across four data centers. Construction will begin 'soon' and is scheduled to be completed in 2028.

Vantage said that it will develop 500 of the 672 total acres of the site, with the rest preserved for natural biodiversity. More than 2,000 native trees will be planted, along with other native landscaping and an eight-foot planted berm with native species for natural sound mitigation.

The campus will use closed-loop liquid cooling, and Vantage said that it will invest in local water restoration projects to achieve water positivity.

On power, Vantage said it will deploy net-new solar, wind, and battery storage. Seventy percent of that will go to the campus, while 30 percent will go to Wisconsin customers. WEC Energy Group said that the deployment will grow to 'nearly two gigawatts.'

However, this deployment is not expected to cover all of the campus's power needs, with remaining power likely coming from fossil fuels and then matched with renewable energy purchases annually.

With the impact of data center power consumption on consumer electricity prices a hot topic, Vantage said that it will underwrite 100 percent of the power infrastructure investment with a dedicated electricity rate from WEC Energy Group utility We Energies. "This proposed rate is designed to protect other customers from any price increases from the new investments to serve Lighthouse," the company said.

Vantage will also invest a minimum of $175 million to make regional infrastructure upgrades, including expanded capacity for water and wastewater treatment facilities, upgraded water mains and sewer lines, a new water tower, and power infrastructure.

Development is expected to employ more than 4,000 majority-union skilled construction jobs, with more than 1,000 jobs over the longer term.

“Expanding Stargate to Wisconsin is another major step toward building the infrastructure that will help ensure everyone can benefit from AI,” said Peter Hoeschele, OpenAI’s vice president of industrial compute. “This project will create good jobs, advance zero-emission energy, and boost the local economy—all while expanding capacity without raising rates for local consumers. We’re grateful to our partners at Oracle, Vantage, and We Energies, as well as the many manufacturers, builders, and suppliers across the region, for helping bring this ambitious vision to life.”

Dana Adams, president of North America, Vantage Data Centers, added: “As demand for data centers expands beyond traditional hubs, the upper Midwest has become a critical and strategic market for Vantage Data Centers and our customers.

“Our investment in Wisconsin reflects the area’s strong foundation for digital growth to support sustainable AI innovation at scale. Vantage is committed to being a good neighbor and is prioritizing investing in sustainable energy, minimizing local impact, and partnering closely with the community to be an economic driver for the state.”