Summary
- We Energies has begun construction on solar, wind, and battery projects in Wisconsin.
- Around half of the new generation is expected to serve Vantage’s 902MW Port Washington data-centre campus.
- The arrangement links hyperscale demand to dedicated generation investment and a tariff intended to allocate infrastructure costs to large customers.
We Energies has started construction on three renewable-energy and battery projects in Wisconsin, with around half of the new generation expected to support Vantage Data Centers’ 902MW Port Washington AI campus.
The programme comprises a 150MW solar project paired with 50MWh of battery storage in Rock County, a 110MW wind development across Iowa and Grant counties, and a separate 75MW battery facility in Walworth County. The projects are expected to be completed by the end of 2027.
Invenergy is developing the assets before transferring them to Wisconsin utilities. We Energies is expected to hold the majority ownership position, with Madison Gas & Electric and Wisconsin Public Service taking the remainder.
Approximately half of the generation associated with each project has been allocated to the Port Washington campus being developed by Vantage Data Centers for Oracle and OpenAI. The campus was announced in 2025 as part of the Stargate infrastructure programme.
The 672-acre development is planned around four buildings and roughly 2.5 million sq ft of data-centre space, with an electricity requirement of up to 902MW. First operation is expected from 2028.
Dedicated generation follows dedicated load
The construction programme is more revealing than a conventional renewable-power purchase agreement. Physical generation and storage assets are being added to the Wisconsin system while a very large new electricity user is developed in parallel.
That distinction matters as utilities face gigawatt-scale data-centre requests. Adding load at this scale can require new generation, substations, transmission upgrades, and reserve capacity. Unless the costs are clearly assigned, existing electricity customers can become exposed to infrastructure built for a small number of unusually large users.
We Energies has introduced a large-load tariff designed to allocate dedicated generation and transmission costs to hyperscale customers. Vantage has said it will underwrite the power-infrastructure investment associated with the Port Washington development.
The renewable build does not mean the campus will physically consume solar or wind output at every hour it operates. Data centres require continuous supply, while renewable output varies with weather and time of day. Batteries can shift and stabilise some energy, but the wider utility system still has to balance the campus when local renewable generation is unavailable.
The structure offers a useful comparator for European markets, where the argument over data-centre electricity demand is increasingly accompanied by a second question: who pays for the generation and network investment required to serve it?
Developers can procure renewable electricity or fund new generation, but utilities still have to ensure the system can maintain frequency, capacity, and resilience when a large load is operating continuously. The cost allocation between developer and general electricity customer can therefore become as politically important as the headline megawatts.
Port Washington also combines that power requirement with high-density AI infrastructure. Vantage has previously described a closed-loop liquid-cooling approach for the campus, bringing the electrical and cooling design into the same large-scale infrastructure programme.
Construction starting on the generation portfolio turns part of that programme from a procurement commitment into physical infrastructure. The next tests will be whether the projects reach operation by the end of 2027 and whether the power and data-centre timetables remain aligned ahead of the campus’s expected 2028 start.
