Northern Virginia.

The market right now

Loudoun County alone runs about 199 operational data centers with another 117 in development. That density has a consequence nobody writes into the marketing brochures: at any given hour, somewhere in the Alley, a crew is racking a breaker, commissioning a UPS string, or verifying absence of voltage in gear that was energized for the first time last week. The market's 4,000+ permitted standby diesel generators — over 11 GW of them — mean paralleling switchgear and ATS work is a daily trade here, not a specialty.

• World's largest data center market: ~7 GW inventory with vacancy under 1% (JLL H1 2026)
• Virginia holds ~13 GW of existing + under-construction capacity (JLL H1 2026)
• Led all North American markets with 1,102 MW net absorption in 2025 (CBRE H2 2025)
• Loudoun County alone: ~199 operational data centers and 117+ in development, 30M+ sq ft (Loudoun County / ROC Telecom 2026)
• 4,000+ permitted backup diesel generators totaling 11+ GW across the region (ROC Telecom 2026 brief)

Every campus on the map

Solid copper markers are operating campuses; white markers are under construction; dashed outlines are announced or planned. Locations are approximate campus-level centroids compiled from public sources — county records, operator announcements, and market reports — as of August 2026. Dense clusters are grouped. Corrections are welcome through the contact page.

Operating campuses mapped

• Equinix Ashburn campus (DC1-DC21) — Equinix · Ashburn. One of the world's densest interconnection hubs, anchor of Data Center Alley
• Digital Realty Ashburn cluster (multiple buildings) — Digital Realty · Ashburn. Multi-campus Loudoun footprint including Digital Dulles sites
• AWS us-east-1 cluster — Amazon Web Services · Sterling / eastern Loudoun. Dozens of AWS-operated buildings anchoring the us-east-1 region
• Vantage VA1 campus — Vantage Data Centers · Ashburn. Large multi-building hyperscale leased campus
• Microsoft Leesburg cluster — Microsoft · Leesburg. Azure East US footprint across western Loudoun sites
• CloudHQ Manassas campus — CloudHQ · Manassas. Multi-building hyperscale-leased mega campus
• QTS Manassas mega campus — QTS (Blackstone) · Manassas. One of QTS's largest East Coast campuses
• Iron Mountain VA campus — Iron Mountain · Manassas / Prince William. Multi-building colocation campus in Prince William
• CyrusOne Sterling campus — CyrusOne · Sterling. Multi-building Northern Virginia colocation cluster
• Aligned Ashburn campus — Aligned Data Centers · Ashburn. High-density colocation campus in Data Center Alley
• NTT Ashburn campus — NTT Global Data Centers · Ashburn. Multi-building VA campus serving hyperscale tenants

Under construction & planned

• Amazon Warrenton data center — Amazon (AWS) · Warrenton (Fauquier County) · planned. Approved 2023 on Blackwell Rd; survived litigation — Fauquier's first hyperscale site (Fauquier Now)
• Devlin Technology Park — Stanley Martin · Bristow (Prince William) · planned. Rezoning approved for multi-building data center park
• PowerHouse Loudoun developments — PowerHouse Data Centers (AREP) · Sterling / Ashburn · under construction. Multiple powered-shell hyperscale buildings in Loudoun
• Amazon statewide expansion (multiple NoVa sites) — Amazon · Loudoun / Prince William · planned. $35B Virginia data center investment pledge by 2040 (Commonwealth of VA 2023)
• Digital Dulles campus — Digital Realty · Leesburg area · planned. Large planned western-Loudoun campus expansion
• Iron Mountain VA expansion — Iron Mountain · Manassas · under construction. Additional buildings underway on Prince William campus

Power

Service territory: Dominion Energy · NOVEC (Northern Virginia Electric Cooperative) · Rappahannock Electric Cooperative (Fauquier).

• Dominion plans ~$50B in capital projects 2025-2029, largely for data center load and new 500kV transmission (Dominion / ROC Telecom 2026)
• Multi-year interconnection waits persist in eastern Loudoun after Dominion's 2022 delivery constraint (Data Center Frontier)
• Massive on-site diesel standby fleets; operators exploring on-site generation and grid-support programs as queue lengthens

The regulatory picture

Enforcement. State-plan state: VOSH (Virginia Occupational Safety and Health), run by the VA Dept. of Labor and Industry, enforces its own construction and electrical standards with local emphasis on construction hazards

Licensing. Statewide licensing via DPOR: journeyman and master electrician cards plus Class A/B/C contractor licenses with electrical (ELE) specialty

Also in play. Prince William Digital Gateway (once billed as world's largest DC corridor) died July 2026 after courts voided rezoning and Compass/QTS withdrew (Virginia Business, WTOP 2026); VA sales-tax exemption on DC equipment remains

What it means for the work

Here is what the numbers mean if you hold the ESWC pen: this region has more first-energizations, more closed-door switching operations, and more contractor crews crossing 110.5 host/contract lines in a week than most states see in a year.

Densest concentration of live electrical rooms on earth — ~200 operating facilities in Loudoun alone means constant commissioning, maintenance and energized-work exposure

4,000+ diesel standby generators (11+ GW) create generator paralleling gear, ATS and fuel-system work at unmatched scale

State-plan VOSH enforcement — Virginia-specific citations and emphasis programs, not federal OSHA

Substation and 500kV transmission buildout (Dominion ~$50B plan) drives medium/high-voltage contractor demand