Microsoft Leesburg Building 4

Under constructionEst.UnclassifiedBuildingLeesburg, Loudoun County, Virginia

Microsoft Leesburg Building 4 is an under construction data center in Leesburg, Virginia. Power capacity has not been disclosed or collected yet. Verification: under construction. 7 cited sources.

30% profile completeness

36 claims from 8 sources

Last verified against sources: Oct 12, 2026

Newest dated evidence: Oct 12, 2026

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Cite this

Text

Datacenter Source. “Microsoft Leesburg Building 4.” /facilities/microsoft-leesburg-building-4-leesburg-va. Data as of 2026-10-12. Accessed 2026-10-12.

BibTeX

@misc{datacentersource_microsoft_leesburg_building_4_leesburg_v_2026,
  title = {{Microsoft Leesburg Building 4}},
  author = {{Datacenter Source}},
  year = {2026},
  howpublished = {\url{/facilities/microsoft-leesburg-building-4-leesburg-va}},
  note = {Data as of 2026-10-12; accessed 2026-10-12. Compiled from cited sources, including OpenStreetMap contributors (ODbL) and Epoch AI (CC BY 4.0)},
}

Please also cite the original source of any specific figure (linked beside it).

Current facility power

Not yet sourced

Planned capacity

Not yet sourced

Floor area

1.29M sq ft[2]

ConfirmedConfirmed

Buildings (planned)

Not yet sourced

Capital cost / investment

Not yet sourced

First operational

Not yet sourced

POWER & GRID

Time-to-power · verification · interconnection

Time to power

Energized — operating

Medium confidence

Project verification

Under construction

Construction documented by permit / site plan.

Current stage

Operational

Furthest stage with documented evidence

Utility · ISO

Dominion Energy · PJM

Substation: Unnamed substation (230 kV) (nearest, unverified)

Power reality

Announced

No record

Interconnection request

No record

Contracted / approved

No record

Under construction

No record

Operational

No record

⚠ No public interconnection record for this load — PJM does not publish large-load requests.

AI evidence brief

Summarizes only the evidence on this page. Answers citing anything else are rejected automatically.

Project verification

Development

Announcedimplied by a later stage
Land acquiredimplied by a later stage
Planning / zoningimplied by a later stage
PermittingOct 12, 2026
Permit / site plan
- Oct 12, 2026 · Permit / case BLDC-2024-000861[2]
- Oct 12, 2026 · Permit / case B20615360100[2]
- Oct 12, 2026 · Permit / case B00263240100[2]
- Oct 12, 2026 · Permit / case B00263150100[2]
- Oct 12, 2026 · Permit / case B10443020100[2]
- Oct 12, 2026 · Permit / case B00227720100[2]
- Oct 12, 2026 · Permit / case B10442950100[2]
- Oct 12, 2026 · Permit / case B10443010100[2]
- +7 more

Grid interconnection

Interconnection application
Feasibility study
System impact study
Facilities study
Interconnection agreement / service contract

Build & energization

Financing
Under constructionOct 12, 2026
Permit / site plan
- Oct 12, 2026 · Reported status: under construction[2]
Energizationimplied by a later stage
OperationalOct 12, 2026
Community map
- Oct 12, 2026 · Reported status: operating[1]

● documented · ◌ implied by a later stage · ○ no evidence found. Dates are those of the earliest dated evidence, which can be later than when a stage actually began. Evidence classes: Permit / site plan, Community map.

Grid path

facility
Microsoft Leesburg Building 4
→
substation
Unnamed substation (230 kV)[1]
Proximity onlyUnverified
Nearest mapped substation, 0.5 km away. Proximity does not establish that it serves the site.
→
transmission
Brambleton - Goose Creek (500 kV)[1]
Proximity onlyUnverified
Highest-voltage line mapped within 2 km (1.87 km away). Not confirmed as the supply path.
→
utility
Dominion Energy[3]
Service territoryLikely
Retail service territory containing the site
→
ISO / RTO
PJM[4]
Service territoryLikely
Balancing authority: PJM

Substation capacity:: not published
Required upgrades:: not yet sourced
Congestion:: not yet sourced (no nodal price data)

Dashed boxes are based on proximity only and do not establish which asset serves the site.

Interconnection records

No interconnection-queue record is linked to this site. Of the ISOs we ingest, only NYISO publishes large-load requests; PJM, ERCOT, MISO, SPP and CAISO queues list generation only.

On-site & dedicated generation

No on-site, behind-the-meter or dedicated generation found in sources.

LOCAL IMPACT

Water · generation · incentives · regulation · rates

Water & cooling

Not yet collected: we haven't found a source for water use or the cooling type at this site. Know one? Add a source

On-site generation & air permits

Not yet collected: we haven't found a source for on-site generation or an air permit for this site. Know one? Add a source

Incentives

Not yet collected: we haven't found a source for tax abatements, PILOTs or other incentives for this project. Know one? Add a source

Regulatory events

Not yet collected: we haven't found a source for hearings, rezonings, permits or commission proceedings. Know one? Add a source

Utility & rates1

GS-5 rate class for customers demanding 25 MW or more[8]ConfirmedBacked by a filing, deed, permit, interconnection-queue record, or a government or utility record. As of Nov 25, 2025.Nov 25, 2025
Dominion Energy · Virginia State Corporation Commission · Docket PUR-2025-00058 · Final order issued · effective Jan 1, 2027
“the new GS-5 rate class will comprise customers demanding 25 megawatts or more. The new rate class will be effective beginning January 1, 2027.”
Applies to Dominion Energy Virginia's service territory; the facility's utility is the most likely retail provider by location unless a source names it.

Location & imagery

Mapped outline

Coordinates: 39.06911, -77.55952
Address: 41720 Inclusion Lane Southeast, Leesburg, VA 20175[1]Est.Modeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure. As of Oct 12, 2026.Likely
County: Loudoun County

Photographs

No openly licensed ground-level photos matched to this site yet.

Ownership, operation & customers

1. Property owner of record
Microsoft[2]
2. Owner / developer
Not identified
3. Operator
Not identified
4. Tenant / cloud
Not identified
5. End customer / workload
Not identified

Power supply

Utility:

Dominion Energy[3]Unverified

Each link is sourced separately. The property owner of record is often a special-purpose entity; the same company appearing in two roles is shown only when sources say so.

All parties with evidence

Property owner of record: Microsoft[2]Confirmed
Utility: Dominion Energy[3]Unverified
Most likely retail provider among 2 overlapping service territories (largest retail sales; territory polygons are approximate). Also overlapping: Northern Virginia Elec Coop.

No tenants or end users identified in our sources yet.

Power (all fields)

Current facility power: Not yet sourced
Planned capacity: Not yet sourced

Capacity figures are nameplate or contracted; annual consumption is a labeled model estimate, not metered data.

Grid & electricity

ISO / RTO: PJM[4]Est.Modeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure.Likelyderived
Location falls inside this ISO/RTO footprint.
Balancing authority: PJM[3]Est.Modeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure.Likelyderived
Control area of the containing utility territory.
Nearest mapped substation: Unnamed substation (230 kV)[1]Est.Modeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure. As of Sep 28, 2026.Likelyderived
Nearest substation mapped in OpenStreetMap; proximity does not establish which substation serves the site.
Distance to substation: 0.5 km[1]Est.Modeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure. As of Sep 28, 2026.Likelyderived
Highest-voltage line nearby: 500 kV[1]Est.Modeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure. As of Sep 28, 2026.Likelyderived
Highest-voltage transmission line mapped within 2 km.
State avg. industrial price: 10.07¢/kWh[6]ConfirmedBacked by a filing, deed, permit, interconnection-queue record, or a government or utility record. As of Jul 2026.Confirmed
Virginia statewide average, July 2026.
State avg. commercial price: 11.68¢/kWh[6]ConfirmedBacked by a filing, deed, permit, interconnection-queue record, or a government or utility record. As of Jul 2026.Confirmed
Virginia statewide average, July 2026.
Generation within 50 km: 1.55 GW[7]Est.Modeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure. As of Jan 1, 202502.Confirmedderived
35 EIA-reported plants within 50 km.
Generation queued in county: 1.04 GW[5]Est.Modeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure. As of Oct 12, 2026.Confirmedderived
11 active generation interconnection requests in Loudoun County: Storage 940 MW, Solar 100 MW. Queued projects often don't get built.
Interconnection status: Not yet sourced
Contracted / committed power: Not yet sourced

Nearby infrastructure	Type	Distance	Voltage / capacity	Source
230 kV line	Transmission line	0.58 km	230 kV	[1]
Brambleton - Goose Creek · Virginia Electric & Power Company	Transmission line	1.87 km	500 kV	[1]
227;2178 · Virginia Electric & Power Company	Transmission line	1.89 km	230 kV	[1]
20 kV line	Transmission line	1.95 km	20 kV	[1]
Potomac Energy Center, LLC · Potomac Energy Center LLC	Power plant (Natural Gas)	1.8 km	766 MW	[7]
Montgomery County Resource Recovery · Covanta Montgomery, Inc.	Power plant (Biomass)	17.1 km	54 MW	[7]
Dickerson Power · Dickerson Power, LLC	Power plant (Natural Gas)	17.7 km	299 MW	[7]
Blake Solar Plant · Horus West Virginia 1, LLC	Power plant (Solar)	32 km	80 MW	[7]
Nih Cogeneration Facility · National Institutes of Health	Power plant (Natural Gas)	40.9 km	28 MW	[7]
Covanta Alexandria/Arlington Energy · Covanta Alexandria/Arlington	Power plant (Biomass)	47.7 km	29 MW	[7]
Covanta Fairfax Energy · Covanta Fairfax Inc	Power plant (Biomass)	49.9 km	98 MW	[7]
Central Utility Plant At White Oak · GSA Metropolitan Service Center	Power plant (Natural Gas)	49.9 km	54 MW	[7]
Unnamed substation	Substation	0.5 km	230 kV	[1]
Altair Switching Station	Substation	0.58 km	230 kV	[1]
Cochran Mill Delivery Point	Substation	1.75 km	230 kV	[1]
Stonewater Substation	Substation	2.06 km	230 kV	[1]
Belmont Substation · Virginia Electric and Power Company	Substation	2.06 km	230 kV	[1]
Trappe Rock Substation	Substation	2.3 km	230 kV	[1]

Largest queued generation in this county	Fuel	Queue status	MW	Source
Loudoun 230 kVPJM AG2-285	Storage	In study · proposed 2023-12	150 MW	[5]
Beaumeade 230 kVPJM AG2-287	Storage	In study · proposed 2023-12	150 MW	[5]
New Road StoragePJM AE2-019	Storage	IA signed · proposed 2026-12	120 MW	[5]
Dulles SolarPJM AF1-147	Solar	IA signed · proposed 2023-12	100 MW	[5]
Roundtable 230 kVPJM AG2-307	Storage	In study · proposed 2023-12	100 MW	[5]
Shelhorn 230 kVPJM AG2-323	Storage	In study · proposed 2023-12	100 MW	[5]

Utility, ISO and nearby assets are derived from the site's location. Proximity to a substation or line doesn't establish the interconnection; that needs a utility filing or interconnection-queue record. Queue requests are applications, not commitments — most never reach operation.

Construction & permitting

Announced
—
Land acquired
—
Permitting
—
Construction start
—
First operational
—
Expected completion
—

Permit / case numbers: BLDC-2024-000861, B20615360100, B00263240100, B00263150100, B10443020100, B00227720100, B10442950100, B10443010100, B10442990100, B10442980100, B10442960100, B10443050100, B10443060100, B10443040100, B10443030100[2]ConfirmedBacked by a filing, deed, permit, interconnection-queue record, or a government or utility record. As of Oct 12, 2026.Confirmed

Real estate

Official assessments

Assessor's value for a tax year

None sourced yet

Recorded transactions

Sale prices from recorded deeds

None sourced yet

Model estimates

Our model — not an appraisal

None sourced yet

Parcel	Record owner	Acres	Zoning / use	Building sq ft	Source
235297431000 Loudoun County, VA	MICROSOFT CORP Project: Compass Creek	311.38	TOWNS · Data Center	1,289,688 built/under construction	[2]

Site area: 311.4 acres[2]ConfirmedBacked by a filing, deed, permit, interconnection-queue record, or a government or utility record. As of Oct 12, 2026.Confirmed
Legal acreage of the parcel(s).
Zoning: TOWNS[2]ConfirmedBacked by a filing, deed, permit, interconnection-queue record, or a government or utility record. As of Oct 12, 2026.Confirmed
Land use: Data Center[2]ConfirmedBacked by a filing, deed, permit, interconnection-queue record, or a government or utility record. As of Oct 12, 2026.Confirmed
Annual property tax: Not yet sourced

Size

Floor area: 1.29M sq ft[2]ConfirmedBacked by a filing, deed, permit, interconnection-queue record, or a government or utility record. As of Oct 12, 2026.Confirmed
Building area on the county's data-center parcel inventory (from building permits).
Building footprint: 247,400 sq ft[1]Est.Modeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure. As of Oct 12, 2026.Likelyderived
Computed from the mapped OSM building outline.
Parcel / land records: MCPI 235297431000 (Loudoun County)[2]ConfirmedBacked by a filing, deed, permit, interconnection-queue record, or a government or utility record. As of Oct 12, 2026.Confirmed

What changed (last 3 years)

Follow this facility (RSS)

Status
OperatingSep 27, 2026[1]EstimatedModeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure.→Under constructionSep 27, 2026[2]EstimatedModeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure.

Timeline

No dated events sourced yet.

All claims (provenance audit)

Field	Value	Source	Confidence	As of	Status
Name	Microsoft Leesburg Building 4way/1128589934 name=Microsoft Leesburg Building 4	[1]	Likely	2026-10-12	Shown
Status	Operating	[1] derived	Unverified	2026-10-12	Superseded / alternative
Status	Under construction	[2] derived	Confirmed	2026-10-12	Shown
Address	41720 Inclusion Lane Southeast, Leesburg, VA 20175	[1]	Likely	2026-10-12	Shown
Property owner of record	MicrosoftMCPI 235297431000: MICROSOFT CORP	[2]	Confirmed	2026-10-12	Shown
Utility	Dominion Energyterritory 19876: VIRGINIA ELECTRIC & POWER CO (INVESTOR OWNED, DOMINION RESOURCE	[3] derived	Unverified	2022	Shown
ISO / RTO	PJMPJM INTERCONNECTION, LLC	[4] derived	Likely	—	Shown
Balancing authority	PJM	[3] derived	Likely	—	Shown
Nearest mapped substation	Unnamed substation (230 kV)way/1292897238	[1] derived	Likely	2026-09-28	Shown
Distance to substation	0.5 km	[1] derived	Likely	2026-09-28	Shown
Highest-voltage line nearby	500 kV	[1] derived	Likely	2026-09-28	Shown
Generation queued in county	1.04 GW	[5] derived	Confirmed	2026-10-12	Shown
State avg. industrial price	10.07¢/kWh	[6]	Confirmed	2026-07	Shown
State avg. commercial price	11.68¢/kWh	[6]	Confirmed	2026-07	Shown
Generation within 50 km	1.55 GW	[7] derived	Confirmed	202502	Shown
Permit / case numbers	BLDC-2024-000861	[2]	Confirmed	2026-10-12	Shown
Permit / case numbers	B20615360100	[2]	Confirmed	2026-10-12	Shown
Permit / case numbers	B00263240100	[2]	Confirmed	2026-10-12	Shown
Permit / case numbers	B00263150100	[2]	Confirmed	2026-10-12	Shown
Permit / case numbers	B10443020100	[2]	Confirmed	2026-10-12	Shown
Permit / case numbers	B00227720100	[2]	Confirmed	2026-10-12	Shown
Permit / case numbers	B10442950100	[2]	Confirmed	2026-10-12	Shown
Permit / case numbers	B10443010100	[2]	Confirmed	2026-10-12	Shown
Permit / case numbers	B10442990100	[2]	Confirmed	2026-10-12	Shown
Permit / case numbers	B10442980100	[2]	Confirmed	2026-10-12	Shown
Permit / case numbers	B10442960100	[2]	Confirmed	2026-10-12	Shown
Permit / case numbers	B10443050100	[2]	Confirmed	2026-10-12	Shown
Permit / case numbers	B10443060100	[2]	Confirmed	2026-10-12	Shown
Permit / case numbers	B10443040100	[2]	Confirmed	2026-10-12	Shown
Permit / case numbers	B10443030100	[2]	Confirmed	2026-10-12	Shown
Floor area	1.29M sq ft	[2]	Confirmed	2026-10-12	Shown
Building footprint	247,400 sq ft	[1] derived	Likely	2026-10-12	Shown
Site area	311.4 acres	[2]	Confirmed	2026-10-12	Shown
Parcel / land records	MCPI 235297431000 (Loudoun County)	[2]	Confirmed	2026-10-12	Shown
Zoning	TOWNS	[2]	Confirmed	2026-10-12	Shown
Land use	Data Center	[2]	Confirmed	2026-10-12	Shown

Sources

[1]
OpenStreetMap — features tagged telecom=data_center or building=data_center
OpenStreetMap contributors · retrieved 2026-10-12 · ODbL 1.0
[2]
Existing Data Center Parcels
Loudoun County, VA — Department of Planning & Zoning GIS · retrieved 2026-10-12 · Public record
[3]
Electric Retail Service Territories (HIFLD, from EIA-861)
DHS HIFLD / U.S. EIA (via Esri Living Atlas) · retrieved 2026-09-28 · Public domain
[4]
Independent System Operators (HIFLD)
DHS HIFLD (via PNNL ArcGIS) · retrieved 2026-09-28 · Public domain
[5]
PJM New Services Queue (planning queues)
PJM Interconnection · retrieved 2026-10-12 · Public
[6]
Electric Power Monthly, Table 5.6.A — Average price of electricity to ultimate customers by state (July 2026)
U.S. Energy Information Administration · retrieved 2026-10-12 · Public domain
[7]
Power Plants in the U.S. (EIA-860)
U.S. Energy Information Administration · retrieved 2026-10-12 · Public domain
[8]
SCC Issues Order on DEV Biennial Review 2025 (Case No. PUR-2025-00058)
Virginia State Corporation Commission · published 2025-11-25 · retrieved 2026-09-29 · Public record

Record links

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Confirmed primary source · Likely reputable secondary or modeled · Unverified inferred · Speculative weak evidence.

Evidence level: ConfirmedBacked by a filing, deed, permit, interconnection-queue record, or a government or utility record. filing, deed, permit or grid recordAnnouncedStated by the company or reported in the press; not yet backed by a filing or grid record. company or press claimEst.Modeled, measured from satellite imagery, inferred from community mapping, or computed by this site. Not a disclosed figure. satellite, model or map inferenceHow levels are assigned

derived computed by our pipeline; estimated a model estimate, not a disclosed figure. Methodology →