Microsoft Leesburg Data Center
Operating · 19515 Compass Creek Parkway, Leesburg, VA
Microsoft operates a data center at 19515 Compass Creek Parkway in Leesburg, Loudoun County. In 2025 a failure at the Cochran Mill substation cut grid power for seven days and the site ran 62 emergency engines. Its air permit covers 104 diesel generators and 3 fire pumps. Virginia DEQ proposed a $2,499,000 civil charge for exceeding fuel and emission limits, and Microsoft cited a $31 million dual-feed system to reduce the chance of a repeat.
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Overview
- Exact-site power
- Not disclosed
- No exact-site MW figure in cited sources.
- Status
- Operating
- Operating facility
- IT floor area
- Not disclosed
- Facility
- Project scope
- Facility at 19515 Compass Creek Parkway, Leesburg, VA.
- Power and grid
- Dual-feed system installed after the 2025 outage
- Cooling and environment
- Asset-specific cooling design and water demand are not disclosed.
Power and grid
- Utility
- Northern Virginia Electric Cooperative
- Substation
- Cochran Mill
- Redundancy
- Dual-feed system installed after the 2025 outage
- Backup generation
- 104 diesel generators and 3 diesel-engine fire pumps permitted
- Grid flexibility
- Ran 62 emergency engines for 7 days on backup power during a June-July 2025 grid outage
Facility and development
- Land transaction
- Microsoft bought 332 acres of the Compass Creek development from Peterson Companies in 2018 for a reported $73 million
- Emissions
- Permit limits of 94.67 tons NOx, 3.34 tons PM and 6.86 tons VOC on a rolling 365-day average; fuel throughput capped at 655,850 gallons per year
- Grid record
- Northern Virginia Electric Cooperative · Cochran Mill
- Regulatory record
- Public project record
Virginia DEQ proposed a $2,499,000 civil charge against Microsoft for air-permit violations during the 2025 outage; public comment ran to Oct. 14, 2026