The World's Busiest Data Center Market Ended Its Own Shortcut. Tomorrow It Votes on Whether the Projects Already in Line Still Get to Use It.

Loudoun County, Virginia holds something close to a fifth of the world's live data center capacity and carries roughly 70 percent of global internet traffic through its substations on an average day — the densest concentration of the industry anywhere on Earth, built over two decades largely on a single administrative convenience: a developer who met the zoning ordinance's basic use standards could get a data center permitted by staff, without ever going in front of the Board of Supervisors. The county ended that convenience, "by-right" permitting, in March 2025, by a 7-2 vote. It grandfathered everything already in the pipeline when the change took effect. On October 6th, the Board takes up whether that grandfather clause should survive, for a batch of projects that assumed, when they filed, that it would.

What by-right meant, and why the board killed it

By-right zoning is the normal, low-friction end of land-use law: if a proposed use is already listed as permitted on a parcel's zoning designation and the application meets the ordinance's objective standards — setbacks, height, parking, that kind of thing — staff approves it administratively, with no public hearing and no vote required. It's how most ordinary commercial and industrial construction gets built everywhere in the country, and for years it's how Loudoun's data center campuses got built too, inside the county's designated data center overlay districts. The problem, as residents and eventually a majority of supervisors came to see it, is that "data center" at the scale these campuses actually operate at — hundreds of megawatts, diesel backup generation, 24-hour cooling plants, new substations — bears very little resemblance to the kind of use the ordinance's objective standards were written to screen for when the overlay districts were drawn. The March 2025 vote moved new data center applications into the "legislative" track: a special exception or special use permit, a public hearing, and a vote the Board can say no to. What it didn't do is touch anything already filed. Those applications kept their by-right status under a grandfather clause written into the same ordinance change — the compromise that got the vote to 7-2 instead of something closer to unanimous opposition from the industry.

The grandfather clause the board now wants to take back

That compromise lasted about eighteen months. In July, Supervisors Laura TeKrony and Juli Briskman — representing districts that have absorbed much of the recent buildout — proposed reopening the question: should the roughly 20 applications still moving through the county's administrative pipeline on by-right status be reclassified as legislative too, so they face the same hearing and the same vote as everything filed after March 2025? A July count put the number of grandfathered applications waiting in that pipeline at 17, representing on the order of 11 million square feet of data center space — a figure that moves as applications are filed, withdrawn, or advanced, which is presumably why county staff and board members have cited slightly different counts at different points over the summer. County Attorney Leo Rogers complicated the simpler version of this plan in August: Virginia law, per a Fairfax County case and a subsequent Attorney General's opinion, doesn't let a locality simply stop accepting or processing land-use applications — a true moratorium, in the traditional sense, isn't available to Loudoun no matter how the Board votes. So the Board reworked the mechanism rather than abandoning the goal. On September 15th, supervisors voted 7-1-1 to advance a resolution — not yet adopted, but teed up for a vote on October 20th — that would pause the Board's own action on data center and substation applications requiring legislative approval, for up to twelve months, retroactive to September 15th. October 6th is where the grandfather clause itself gets taken up directly: whether those 17-to-20 already-filed applications keep the by-right status they were promised, or get swept into the legislative track, and the twelve-month pause, along with everything newly filed.

The planning commission had already said no once

The policy fight didn't arrive out of nowhere. In July, Loudoun's Planning Commission voted 5-0 to recommend denying Active Infrastructure's application for Spring Valley Technology Park, a 325-acre, roughly 3.25-million-square-foot campus near Beaverdam Reservoir — at the time, one of the largest single data center proposals the county had seen. County staff logged 166 written comments opposing it against seven in support, and fifty residents spoke against the project at the hearing versus one in favor. The objections tracked the same list that shows up in nearly every data center fight nationally — grid strain, diesel generator noise and emissions, a rural area's character changing under a campus built at industrial scale — but the vote itself mattered beyond this one project: it was the clearest signal yet that even a planning body accustomed to data center applications had stopped treating them as routine, months before the Board took up the grandfather clause question directly.

It isn't just Loudoun, and it isn't just a pause

Zoom out one county and the same month gets more striking. On September 22nd, Prince William County's Board of Supervisors voted 8-0 — unanimous, no dissent at all — to end by-right data center development countywide, not just pause it. The county's Data Center Opportunity Zone Overlay, the district where by-right rules applied, shrinks from roughly 9,700 acres to about 3,641 acres under the new ordinance; every future project outside whatever stays by-right will need a special use permit, with a 90-day grace period for developers to get applications in before the new rules take effect. And on top of both county actions, Governor Abigail Spanberger signed Executive Order 22 in September, which bans state executive-branch agencies from signing non-disclosure agreements with data center developers, directs state environmental regulators to write new noise rules and designate parts of Eastern Virginia a cooling-water-scarcity area, and — the piece that matters most for anything already in a permitting pipeline — immediately excludes any data center with 25 megawatts or more of peak demand from every expedited-permitting, discretionary economic-development, or site-readiness program the state runs. Three separate governments, inside the same few weeks, all moving the same direction: away from treating a data center application as a routine administrative matter, and toward treating it as something that gets a hearing, a vote, and in the state's case, no expedited lane at all above 25 megawatts — a threshold most of the campuses actually driving this fight clear by an order of magnitude.

The money the shortcut built

None of this is happening in a county that can treat data centers as a nuisance to be zoned away without cost, and it's worth saying plainly what Loudoun stands to lose if the pace of new approvals actually slows. Data center real and personal property taxes generate somewhere between 38 and 42 percent of the county's local tax revenue, depending on exactly which funds get counted — by a wide margin the single largest source of money funding Loudoun's schools, public safety, and the tax rate cuts the county has been able to afford in recent budget cycles. That dependency is the real reason this fight is happening inside the legislative and administrative machinery of county government rather than at the ballot box or in court the way it has in some other jurisdictions this year: Loudoun's supervisors aren't trying to drive the industry out, they're trying to get a vote on each new project before it's built, while still collecting the tax base that already exists. Whether a slower, more discretionary pipeline costs the county meaningfully in future projects that choose to locate somewhere else instead is an open question nobody on either side of this vote can actually answer yet — which is exactly why it's being litigated application by application rather than settled by a single, clean set of numbers.

The diligence angle

By-right status normally sits near the top of our evidence ladder — it's the rung where a government has already pre-cleared a use, with no discretionary vote left to lose. What Loudoun's grandfather-clause fight shows is that even that rung isn't fixed once a county changes its mind about the policy underneath it, and the gap between "filed under by-right rules" and "vested rights that actually crystallized under Virginia law before the cutoff" is exactly the kind of distinction a Kill Test is built to force into the open rather than assume. Memphis found a version of this same problem from the opposite direction — a zoning code that never had a category for a hyperscale campus in the first place, so "industrial" became the only box anyone had to check. Loudoun's problem is the inverse: a code that did have a category, administrative and fast, that the county is now actively trying to take back from the projects that already relied on it. Both failure modes land on the same lesson. A permitted-use label, by itself, tells you how a project is currently classified. It doesn't tell you how durable that classification is against a government that's already shown, in the same calendar year, that it's willing to revisit the rule rather than live with what it wrote eighteen months earlier.

GridPermit works Colorado, not Northern Virginia, and nothing in Xcel Energy's territory has anything close to Loudoun's concentration of hyperscale load or its share of the county budget. But every site we evaluate gets asked a version of the question Loudoun's own supervisors are about to answer for seventeen-odd projects that thought they'd already cleared it: is the entitlement actually vested, on terms a court would recognize if the jurisdiction changed the rules tomorrow, or is it just the classification that happened to apply on the day the application was filed? Texas's interconnection deposit rule exists because regulators stopped taking a claimed megawatt figure on faith. October 6th is the day Loudoun finds out whether the same skepticism now applies to a zoning status the county itself granted.