TL;DR · 30-second read

The Short Version

A huge data center campus is being built in Port Washington, Wisconsin. To plug it into the electric grid, it needs new high-voltage power lines and substations costing $1.3 billion to $1.7 billion.

Wisconsin’s utility regulators just sent that power-line plan back to square one. The company behind it changed its paperwork so often, filing or refiling 564 documents, that officials and the public could not keep up.

The takeaway: a building can go up faster than the wires that power it.

Wisconsin’s Public Service Commission (PSC) voted unanimously on Thursday to revoke its “completeness” determination for American Transmission Co.’s application to build the Ozaukee County Distribution project, Wisconsin Public Radio reported. The project is a package of new substations, new high-voltage transmission lines and upgrades to existing infrastructure. ATC told regulators it is needed to serve the hyperscale data center campus under construction in Port Washington. A revised application filed in July put the cost at $1.3 billion to $1.7 billion, and the work would have spanned six counties.

The vote closes the current case and eliminates the December 2026 deadline for regulators to rule. ATC must now file a new application in a new proceeding. The commission did not deny the project. But the reset undercuts ATC’s plan to begin construction in December and finish by the end of 2027.

Executive Summary

The PSC withdrew its finding that ATC’s application was complete enough to review. Commission chair Summer Strand said ATC filed or refiled 564 application documents after the December 2025 completeness determination. She called the result a “moving-target application” that left staff unable to prepare evidence and kept intervening parties and the public from participating meaningfully. ATC and a ratepayer watchdog both said they could not recall the commission taking this step in recent decades, if ever.

The decision matters beyond the six counties the line would cross. It separates two things developers often treat as one schedule: building a data center and energizing it. The Port Washington campus is under construction. The $1.3 billion to $1.7 billion of grid work that ATC says the campus needs is now back at the start of state review, with no ruling deadline in place.

Vantage Data Centers, one of the campus developers, said it respects the commission’s role but is disappointed. ATC said it is “considering its options.” Neither company has said when a new application will be filed or how the reset affects the campus’s power-on dates.

The Campus Is Rising; Its Power Line Just Went Back to Start

The Port Washington case shows a data center moving faster than the infrastructure it depends on. ATC stated in PSC filings that the Ozaukee County Distribution project is needed to provide electric service to a data center that is already under construction. Under ATC’s plan, regulators would rule by December 2026, construction would begin in December, and the buildout would be complete by the end of 2027. Thursday’s vote removed the first step of that sequence, and the others depend on it. A new application means a new proceeding, a fresh completeness review, and a new statutory clock that starts only once regulators again find the filing complete.

Chair Strand was direct about the cost of that reset: “I recognize the impacts this decision will have on construction timelines and in-service dates for the project.” In-service date is utility shorthand for the day a line is energized and able to carry power. For a hyperscale campus, the kind of facility being built to meet cloud and AI computing demand, that date matters more than any other. Until it arrives, a finished data hall cannot run the servers it was built for.

The mechanism is two approval tracks moving at different speeds. The building advances on local approvals and private capital. The wires require a state certificate, reviewed in a contested proceeding in which staff, intervenors and the public all have a role. The size of the dependency is set by the $1.3 billion to $1.7 billion estimate: substations, new high-voltage lines and upgrades across Ozaukee, Washington, Sheboygan, Calumet, Fond du Lac and Manitowoc counties. When the grid track slips, the delay falls on the developers, on ATC’s capital plan, and on whichever tenants eventually expect to occupy the campus.

What 564 Filings Did to a Legal Clock

In Wisconsin, a major transmission project needs a certificate of public convenience and necessity (CPCN), the state’s permission to build a large utility facility. A completeness determination is the gate into that process. It confirms the application contains what regulators need, and it starts the deadline for a decision. Commissioner Marcus Hawkins described the logic: “We have strict timelines that are feasible only when we have a complete application.” If the application keeps changing after that gate, the deadline stays fixed while the thing being reviewed does not.

That was the commission’s core finding. According to Strand, ATC filed or refiled 564 documents after being found complete in December 2025. The commission’s administrative law judge had raised concerns last month about missing and changing information. All three commissioners criticized the volume of changes. The reasoning is procedural, not a verdict on whether the line is needed. Staff cannot build an evidentiary record, and parties cannot respond, when the proposal keeps moving.

ATC’s counterargument deserves a fair hearing. Its attorneys wrote that “in its entire history, the Commission has never revoked a determination that a CPCN application is complete,” and argued against doing so here. Large grid projects serving new, very large loads can change as the load itself is refined, and a restart is a costly remedy. The commission weighed that against the integrity of the review and chose reviewability. Both positions protect something real. The open question is which of them ATC’s revisions were actually driven by.

A Precedent That Will Shape the Next Filing

A first-ever revocation signals a lot to every utility preparing a large application in Wisconsin. The practical lesson for transmission owners and data center developers is to settle project scope before filing, not during review, because a regulator has now shown it will reset the clock rather than review a shifting target. That raises the value of early coordination between the developer’s load plans and the utility’s design. It also raises the cost of filing early to secure a place in the schedule.

The decision also landed amid visible public opposition. Residents and anti-data center activists pushed back on the project, and comedian Charlie Berens submitted comments to the PSC arguing it was “no longer clear to the public or public officials what their actual plans are.” Opponents framed the issue as transparency. The commissioners framed it as process integrity, grounding their vote in the volume of changes rather than in objections to the data center. The outcome addresses the transparency concern procedurally, by requiring a stable application the public can review. It says nothing yet about whether the project should ultimately be built.

For Vantage, the statement that it will pursue “responsible development” of the needed transmission suggests it expects to see the project through. How quickly that can happen now depends on how fast ATC can refile a fixed application and how long a restarted proceeding takes.

Background

American Transmission Co. is a transmission-only utility that builds and operates high-voltage power lines across much of Wisconsin. Major new lines require a certificate from the Public Service Commission of Wisconsin, the three-member state body that regulates utilities. The commission reviews applications in formal proceedings in which staff, intervening parties and the public can weigh in, under deadlines that begin once an application is found complete.

Port Washington, in Ozaukee County north of Milwaukee, is the site of a hyperscale data center campus. Vantage Data Centers is one of its developers. Campuses of this scale need far more electricity than local distribution networks were built to deliver. That is why ATC proposed the Ozaukee County Distribution project, which the PSC found complete in December 2025 before the application’s many subsequent revisions led to Thursday’s revocation.

Sources

Source: PSC deals major blow to transmission project supporting Port Washington data center (Wisconsin Public Radio). Report on the Wisconsin PSC’s vote to revoke the completeness determination for ATC’s $1.3 billion to $1.7 billion Ozaukee County Distribution project.

TL;DR · 30-second read

The Short Version

A data center in Virginia makes its own electricity with eight gas-burning turbines, each about the size of a bus, close to people’s homes.

A Harvard researcher estimated its air pollution could cause tens of millions of dollars a year in health harm. Virginia’s environmental regulator moved quickly to challenge that estimate, even though one of its own experts said judging health effects was outside his training.

Why it matters: more of the buildings that run artificial intelligence want their own power plants, and fights like this one will decide where they can be built.

Politico reported on July 25 that internal emails, obtained through a public records request, show Virginia’s Department of Environmental Quality (DEQ) organized a rebuttal to a health analysis of Vantage Data Centers’ self-powered facility in Sterling, Loudoun County, before that analysis was published. DEQ Director Michael Rolband forwarded the Piedmont Environmental Council’s report to seven air-permitting staff within five minutes of receiving it in early March. He asked for “a defensible critique that will stand the test of public and critical review.”

The Piedmont-commissioned study estimated that soot from the facility’s eight natural gas turbines could cause $53 million to $99 million a year in health costs, and 3.4 to 6.5 premature deaths, if the site emitted the maximum its permit allows. DEQ’s own report, released in late April, said actual emissions were 28 to 69 percent of permitted levels. The agency has said its staff “did not collaborate with PEC, Vantage or any other external participants” in its assessment.

Executive Summary

This dispute centers on the only data center in Virginia that generates its own electricity. Its on-site power system combines eight bus-sized natural gas turbines with dozens of backup diesel generators, and it sits in a residential area. DEQ’s 2023 permits allow up to 95 tons a year of nitrogen oxides (gases that help form smog) and more than 56 tons of soot, meaning fine particles that lodge in the lungs. Both pollutants are linked to asthma and heart attacks. Those limits are typical for a minor pollution source. The dispute arose because of where the facility sits, not because of how large the limits are.

It matters beyond one building because self-generation is becoming the industry’s answer to grid congestion. Dominion Energy disclosed in February that it receives about 10 new connection requests a month from large-load customers. It also disclosed that dozens of projects requesting a combined 70 gigawatts are waiting to connect, three times the utility’s all-time peak load. Vantage itself described its turbines to DEQ as “a temporary solution given the current power constraints of the grid.”

The episode shows how the health case against on-site generation gets built. Critics model the legal ceiling in the permit, not the meter reading. Even when actual emissions come in well below that ceiling, the permit keeps the higher figure in play.

The Permit Ceiling Is the Number That Gets Modeled

Michael Cork, a biostatistics research fellow at Harvard’s T.H. Chan School of Public Health, did not have Vantage’s operating data when Piedmont hired him. He used the only public figures available, which were the permitted maximums. That produced the headline range of $53 million to $99 million in annual health costs. Vantage objected that this was a “worst case scenario,” and DEQ’s report made the same point: measured emissions of soot, volatile organic compounds and nitrogen oxides ran at 28 to 69 percent of what the permit allows.

The correction lowered the estimate but did not end the argument. Cork reran his model with DEQ’s actual-emissions figures and arrived at $33 million to $63 million a year and two to four premature deaths. He also noted that nothing in the permit prevents the facility from increasing output back toward its ceiling. That is the mechanism the headline refers to. A permit is a legal right to emit, so outside analysts can reasonably treat it as the facility’s potential footprint, whatever the current meter shows.

This matters for developers planning on-site generation. Operators often seek permit headroom so they can run harder when the grid is strained or when load grows. That headroom has operational value. It is also, in effect, a published number that critics can model. A project that wants its real-world performance to count in public debate may need to make that performance binding, through enforceable limits closer to expected output or regular public reporting of actual emissions, rather than relying on a regulator to vouch for it after the fact.

Why Self-Power Keeps Spreading Anyway

The economics pushing data centers toward their own power plants are not easing. A 70-gigawatt connection backlog at a single utility means many projects face long waits for grid power. On-site gas turbines offer a way to start operating sooner. They also answer the political charge that data centers raise household electricity bills. The federal government has encouraged the model too: President Donald Trump promoted a wave of power plants for new data centers at a White House meeting with technology companies in early March.

The Vantage case shows the trade-off. Self-generation moves the power question off the utility’s books and onto the local air-permit docket. The cost stops appearing in rate cases and starts appearing in health-damage estimates for the neighborhood downwind. The more facilities follow this path, the more often permitting agencies will be asked to rule on disputes that go beyond their traditional remit.

A Regulator’s Rebuttal Is Not a Health Finding

The emails show disagreement inside DEQ about how far the agency should go. Michael Kiss, a manager in the Office of Air Quality Assessments, wrote that the magnitude of impacts was “relatively low” and not surprising. He also said he had “absolutely no comments on the health study” because “we aren’t qualified to do that review.” Robert Burnley, who led DEQ from 2002 to 2006, said the conventional defense of a permit is narrower: that the emissions do not cause a violation of air quality standards.

Several claims in DEQ’s final report are open to challenge on their own terms. The report said health impacts were “unlikely” because Loudoun County soot levels are below EPA standards. Health experts, including former EPA air quality official Michael Koerber, said soot can harm health even at EPA-approved levels, and the World Health Organization’s guideline is nearly half the EPA figure. The report also cited 2023 state health data, collected before Vantage began operating, to describe Loudoun as one of Virginia’s healthiest localities. That data says little about the facility’s effect.

For the industry, the lesson is practical rather than partisan. The Data Center Coalition circulated DEQ’s report to reporters and lawmakers as evidence that the Piedmont analysis was wrong. A rebuttal whose health reasoning is contested gives less protection than it appears to. The most useful thing DEQ published was arguably the actual-emissions data. It narrowed the dispute to a real number, even though that number still produced a substantial estimate.

Siting Near Homes Is Where the Costs Land

DEQ’s permits for Vantage are in line with other minor-source permits in the state. The concern stems from the facility’s location in a residential area. Neighbors report constant noise as well as air pollution. Vantage says it has taken steps to reduce the noise. Health-cost models of the kind Cork used scale with the number of people in a plume’s path, so the same turbines sited away from housing would generate a very different estimate.

Virginia has more than 600 data centers, and many future self-powered sites will compete for land in areas that are already developed. Where generation sits relative to homes is likely to be as consequential for permitting risk as how many tons it is allowed to emit.

Background

Northern Virginia, and Loudoun County in particular, hosts the world’s largest concentration of data centers, and Virginia is home to more than 600 of them. Dominion Energy, the region’s largest utility, has struggled to keep pace with demand. Large projects now wait in a queue that is far larger than anything the utility has ever served. In response, developers have begun planning facilities that generate their own electricity on site, usually with natural gas turbines.

Vantage Data Centers’ Sterling facility came before that trend. DEQ issued its air permits in 2023. The Piedmont Environmental Council, a Virginia conservation group, has been active on data center land-use and environmental impacts. The Data Center Coalition is the industry’s trade group.

Sources

Source: Emails show how Virginia regulators downplayed data center health concerns — Politico’s report on internal DEQ emails concerning Vantage’s self-powered Loudoun County data center.