Groundwork › Counties

Data centers in Loudoun County, VA

Everything on file with the regulator, added up. Every figure links to the filing it came from.

85data center sites
92issued air permits
5,882permitted backup generators
4,859tons/year NOx permitted
[01] Is that a lot?

The densest county Groundwork tracks.

Loudoun County holds 5,882 permitted backup generators across 85 sites. The median tracked county with any generator data has 248. This is one of the densest concentrations of permitted data center generation in the country.

Loudoun County 5,882
Prince William County 2,058
Fairfax County 1,757
Spotsylvania County 605
Fauquier County 521
Caroline County 266
Henrico County 248
Culpeper County 147

Counties with permitted generator counts Groundwork has read from permit documents. Only Virginia publishes permits in a form that makes this countable today, so this ranking is Virginia-only — not a claim that no county elsewhere is denser.

[02] What the permits actually authorise

What this does — and doesn't — mean.

It is smaller than it sounds

These are emergency backup generators. They are permitted to run during grid outages and for routine testing — typically tens of hours a year, not continuously. A permit is a ceiling on what a site may emit, not a measurement of what it does emit.

A permit also is not a building. An issued permit establishes approval; it does not establish that anything is built, energised or running.

None of the 49 sites here that Groundwork could locate sits in a FEMA Special Flood Hazard Area.

It is bigger than any one filing shows

No single permit discloses the 5,882 generators permitted in this county. That number exists only because 92 separately-published filings were added together. Each one, read alone, looks routine.

39 of the 73 permits here with a readable NOx figure are permitted at 90–99.99 tons per year — just beneath the 100 ton/year threshold that triggers major-source review and public participation. Statewide the pattern is sharper still: 70 permits sit in that band and 2 reach 100.

SiteOperatorPermitted NOx (t/yr)Under 100 by
Amazon Data Services, Inc. IAD-62/68/81/83/93/609/614Amazon99.180.82
STACK Infrastructure Data Center - SI NVA06A LLCSTACK Infrastructure99.170.83
QTS LLC - Ashburn-Shellhorn Data CenterQTS98.321.68
Cologix ASH1Cologix96.823.18
ASH2 Lockridge Data Center - QTS Investment Properties Ashburn II LLCQTS96.733.27
Darab Ventures One, Two, Six LLCCloudHQ96.573.43
Digital Realty - Sterling Premiere LLCDigital Realty96.323.68
Amazon Data Services, Inc. IAD-61 IAD-63 IAD-65 IAD-86 IAD-155 IAD-600 IAD-018Amazon96.123.88
Aligned Energy Data Centers (Ashburn), LLCAligned Data Centers96.053.95
Amazon Data Services IAD-215Amazon96.043.96
Amazon Data Services, Inc. IAD-114 IAD-115Amazon96.033.97
Amazon Data Services, Inc. IAD-116 IAD-117Amazon96.033.97
Amazon Data Services, Inc. IAD-144 IAD-145Amazon96.033.97
Amazon Data Services, Inc. IAD 50 IAD 60 IAD-71 IAD-78 IAD-79 IAD-80Amazon96.033.97
Amazon Data Services Inc IAD-180, IAD-181, IAD-182, & IAD-183Amazon96.033.97
Amazon Data Services Inc IAD-156 IAD-157 IAD-158 IAD-159 IAD-327Amazon96.033.97
Amazon Data Services, Inc. IAD-90 IAD-91 IAD-92Amazon96.033.97
Amazon Data Services Inc - IAD-667, IAD-668, IAD-669, IAD-670, and IAD-671Amazon96.033.97
Amazon Data Services, Inc. IAD-140/141/143Amazon964
Aligned Data Centers IAD03Aligned Data Centers964
Equinix, LLC - AshburnEquinix95.964.04
Zayo Group, LLCZayo95.874.13
SI NVA01 ABS, LLCSTACK Infrastructure95.624.38
Vantage Data Centers VA2 LLCVantage Data Centers955
Vantage Data Centers VA16 LLCVantage Data Centers955
Wheeler Data Center—955
Hayden Technologies, LLCHayden Technologies955
CyrusOne – NVA14CyrusOne94.985.02
Microsoft Corp - Leesburg Data Center (IAD01-02-03-04-05)Microsoft94.675.33
CyrusOne KincoraCyrusOne94.615.39
MECP1 Ashburn 2, LLC—94.55.5
1501 Moran Road Development Owner, LLC—94.55.5
Belmont Innovation Campus—94.495.51
Amazon Data Services Inc IAD-170Amazon94.455.55
Amazon Data Services Inc - IAD-243/244/290/291/292Amazon94.455.55
CyrusOne Sterling IX/X/XICyrusOne94.435.57
Compass IAD DatacenterCompass Datacenters94.055.95
Digital Western Lands LLCDigital Realty946
Vantage Data Centers VA11, VA12, VA13, VA14, & VA15Vantage Data Centers93.56.5

Read from the emissions table of each permit and labelled probable accordingly. A permit sized below a review threshold is lawful and common; Groundwork reports the pattern, and takes no view on any individual application.

[03] The sites

Every tracked site in Loudoun County.

SiteOperatorPermitsGeneratorsNOx t/yrFlood zone
Intergate Ashburn, LLCSabey Data Centers190054.37Zone X
Amazon Data Services, Inc. IAD-51 IAD-56 IAD-88 IAD-89Amazon17502.21Pending
Digital Western Lands LLCDigital Realty175094Zone X
Digital Loudoun Pkwy Center N LLCDigital Realty250086.7Zone X
Equinix, LLC - AshburnEquinix150095.96Zone X
Aligned Energy Data Centers (Ashburn), LLCAligned Data Centers150096.05Zone X
Iskander (LC-1A) Jamshid (LC-1B) Kaveh (LC2) Lohrasp Ventures (LC3)CloudHQ114280.97Zone X
Darab Ventures One, Two, Six LLCCloudHQ113196.57Zone X
Vantage Data Centers VA11, VA12, VA13, VA14, & VA15Vantage Data Centers112193.5Pending
Digital Realty (Digital Loudoun 3 & 4, LLC)Digital Realty111960.4Zone X
Amazon Data Services, Inc. IAD-140/141/143Amazon110896Pending
CyrusOne KincoraCyrusOne110294.61Zone X
Amazon Data Services Inc IAD-124/125/126/127Amazon1963Pending
Compass IAD DatacenterCompass Datacenters17594.05Zone X
Cologix ASH1Cologix17596.82Zone X
QTS LLC - Ashburn-Shellhorn Data CenterQTS16598.32Zone X
21571 Beaumeade Circle LLC—16024.7Zone X
Amazon Data Services Inc IAD-161, IAD-162, IAD-606, IAD-285, IAD-286, IAD-299, IAD-611Amazon15286.38Zone X
Aligned Data Centers IAD03Aligned Data Centers15096Zone X
Vantage Data Centers VA2 LLCVantage Data Centers14995Zone X
CyrusOne Sterling IX/X/XICyrusOne14894.43Zone X
STACK Infrastructure Data Center - SI NVA06A LLCSTACK Infrastructure14299.17Pending
Digital Filigree LLCDigital Realty1294.37Zone X
Digital Realty - Ashburn CampusDigital Realty32815Zone X
Zayo Group, LLCZayo12695.87Pending
H5 Data Centers - AshburnH5 Data Centers12675.54Zone X
NTT Global Data Centers Americas, Inc.NTT Global Data Centers12525Pending
Amazon Data Services, Inc. IAD-114 IAD-115Amazon12096.03Zone X
Belmont Innovation Campus—12094.49Pending
Amazon Data Services, Inc. IAD-116 IAD-117Amazon12096.03Zone X
Amazon Data Services, Inc. IAD-144 IAD-145Amazon12096.03Pending
VA1 Data Center—11926Zone X
Amazon Data Services, Inc. IAD-61 IAD-63 IAD-65 IAD-86 IAD-155 IAD-600 IAD-018Amazon11896.12Pending
Amazon Data Services, Inc. IAD-10 IAD-32 IAD-98 IAD-99 IAD-118 IAD-119 IAD-129Amazon11814.4Zone X
MECP1 Ashburn 2, LLC—11694.5Zone X
1501 Moran Road Development Owner, LLC—11694.5Pending
Microsoft Corp - Leesburg Data Center (IAD01-02-03-04-05)Microsoft11694.67Pending
Amazon Data Services, Inc. IAD-12 IAD-15 IAD-16 IAD-76 IAD-230Amazon1162.6Pending
Amazon Data Services Inc IAD-169/179Amazon1162.88Zone X
Amazon Data Services, Inc. IAD 50 IAD 60 IAD-71 IAD-78 IAD-79 IAD-80Amazon11696.03Pending
Amazon Data Services IAD-215Amazon11596.04Pending
SDC Ashburn I - SE Parcel Campus—11519.28Zone X
Amazon Data Services Inc IAD-170Amazon11594.45Pending
Amazon Data Services Inc IAD-180, IAD-181, IAD-182, & IAD-183Amazon11596.03Pending
Kincora Data Center—11576.87Zone X
Vantage Data Center VA3 LLCVantage Data Centers11517.71Zone X
Equinix LLC (DC-21/DC-22)Equinix11577.3Zone X
Amazon Data Services Inc IAD-156 IAD-157 IAD-158 IAD-159 IAD-327Amazon11596.03Zone X
Amazon Data Services, Inc. IAD-90 IAD-91 IAD-92Amazon11596.03Pending
CyrusOne – NVA14CyrusOne11594.98Zone X
Vantage Data Centers VA16 LLCVantage Data Centers11595Zone X
Digital Realty - Sterling Premiere LLCDigital Realty11596.32Zone X
QTS Dulles, LLCQTS1156.38Zone X
Equinix LLCEquinix21566.15Zone X
Wheeler Data Center—11495Pending
Amazon Data Services Inc - IAD-667, IAD-668, IAD-669, IAD-670, and IAD-671Amazon1996.03Pending
QTS Investment Properties Ashburn LLCQTS160.55Zone X
Amazon Data Services Inc IAD-120/121/122Amazon152.88Pending
SI NVA01 ABS, LLCSTACK Infrastructure1595.62Zone X
Amazon Data Services, Inc. IAD-6 IAD-13 IAD-54Amazon154Pending
ASH2 Lockridge Data Center - QTS Investment Properties Ashburn II LLCQTS1596.73Zone X
Amazon Data Services Inc - IAD-163/164/174Amazon152.88Pending
CyrusOne Northern Virginia Data Center - Maries RoadCyrusOne1521.82Zone X
VeriSign Incorporated Broad Run Facility2VeriSign1423.6Zone X
Hayden Technologies, LLCHayden Technologies1395Pending
Amazon Data Services Inc - IAD-243/244/290/291/292Amazon1294.45Pending
Inova Health Care Systems - IT OperationsInova Health12—Zone X
George Washington University - VA Campus Bldg IIGeorge Washington University1210.95Pending
Yondr Data CenterYondr1——Pending
Microsoft Corp Blue Ridge (IAD11-12-13) Data CenterMicrosoft1——Pending
Amazon Data Services, Inc. IAD-62/68/81/83/93/609/614Amazon1—99.18Pending
Amazon Data Services, Inc.Amazon1——Pending
Verizon Business Network Services, Inc.Verizon1——Pending
Equinix LLC - DC 13Equinix1——Pending
21110 Ridgetop Circle LLC—1——Pending
Amazon Data Services, Inc. IAD-150 IAD-151 IAD-152Amazon1——Pending
Sentinel Ashburn NexusSentinel Data Centers1——Pending
CyrusOne Loudoun Tech CenterCyrusOne1—71.36Zone X
CyrusOne Northern Virginia Data Center - Shaw RoadCyrusOne1——Pending
NTT Global Data Centers VA2, LLCNTT Global Data Centers1——Zone X
Amazon Data Services, Inc. IAD-57 IAD-58Amazon1—63.76Zone X
Visa USA IncorporatedVisa4—71Zone X
VADATA Inc MEG FourAmazon1—1.7Zone X
22995 Wilder Court LLC—1—24.6Zone X
22810-22860 International Drive LLC—1——Zone X

24 operators of record · 1 of 49 located sites draw from a basin WRI rates high or extremely high for water stress.

What VA publishes

Virginia is the only state that publishes a data-center-specific air permit list, with the issuance document for every permit. That is why Virginia pages carry permit counts, generator counts and permitted NOx, and most other states do not.

  • VA DEQ — Issued Air Permits for Data Centers — in use. 201 permits, each with its issuance PDF, read for address, equipment and permitted emissions.

Spotted an error?

Fuzzy-matched fields are labelled as such and some will be wrong. Open an issue — corrections are tracked in public and noted on the page.