Microsoft Leesburg (IAD01-02-03-04-05) Data Center
approved CampusOperated by Microsoft Corporation
Virginia DEQ issued Microsoft an amended air permit (Registration No. 74220) on March 7, 2025 covering emergency engine gen-sets and three diesel fire pumps at the Leesburg IAD01 through IAD05 data center. The permit equipment list covers 100 Caterpillar C175-16 emergency gen-sets rated 3,100 ekW each, permitted in tranches originally dated June 26, 2020, December 21, 2021, September 14, 2023, and August 16, 2024, plus two Caterpillar C27 units at 750 ekW and two Caterpillar C32 units at 1,000 ekW.
Land use jurisdiction: Town of Leesburg
Measurements on record
Approvals, by aspect
| Aspect | Approving body | Instrument | Status |
|---|---|---|---|
| Air permit (backup generators) | Virginia Department of Environmental Quality | Article 6 minor NSR permit (amended), Registration No. 74220 (2025-03-07) document |
on record |
| Land use entitlement (CUP / rezoning) | not yet requested | ||
| CEQA review | not yet requested | ||
| Building permit | not yet requested | ||
| Water supply (will-serve) | not yet requested | ||
| Wastewater / septic | not yet requested | ||
| Stormwater / retention ponds / dry wells | not yet requested | ||
| Grid interconnection | not yet requested | ||
| Natural gas supply | not yet requested | ||
| Tax abatement / development agreement | not yet requested |
Location and sources
Leesburg, Loudoun County, Virginia
Every record links to its source: openly licensed datasets (Epoch AI, CC BY; Wikidata, CC0; US EPA, public domain) and public permit records. Full sourcing and licensing: methodology · sources.