Amazon IAD-156/157/158/159 Data Center
Expanding · 43920 Lone Cedar Lane, Chantilly, VA
Amazon Data Services' IAD-156 data center at 43920 Lone Cedar Lane, Chantilly, sits on an 82.17-acre Amazon parcel in Loudoun County that also holds IAD-157 and IAD-158 on Meadowdale Drive. The county assesses Building A there as a two-story, 259,420 sq ft data center built in 2023, and in May 2026 issued a shell construction permit for IAD-159. Virginia DEQ permit 74250 covers IAD-156 to IAD-159 and IAD-327, including 26 Caterpillar 3516C-HD emergency gen-sets and 104 non-emergency diesel gen-sets fitted with SCR.
Overview
- Exact-site power
- Not disclosed
- No exact-site MW figure in cited sources.
- Status
- Expanding
- Expanding facility
- IT floor area
- Not disclosed
- Facility
- Compute profile
- Hyperscale · Cloud
- Project scope
- Amazon's parcel holds Building A, a two-story 259,420 sq ft data center built in 2023. In May 2026 Loudoun County issued a new data center shell construction permit for IAD-159 on the same parcel.
Power and grid
- Backup generation
- Twenty-six Caterpillar 3516C-HD gen-sets (Ref. Nos. 1-26), one 600 ekW Caterpillar C18, three Caterpillar 3512C, four 750 ekW Caterpillar C18 and two Caterpillar 3516C transitory units are emergency gen-sets; 104 further gen-sets (Ref. Nos. 31-134) are permitted as non-emergency diesel units with closed-loop SCR and catalyzed diesel particulate filters.
Facility and development
- Construction
- Amazon's parcel holds Building A, a two-story 259,420 sq ft data center built in 2023. In May 2026 Loudoun County issued a new data center shell construction permit for IAD-159 on the same parcel.
- Facility class
- Hyperscale · Cloud
- Air permits
- Virginia DEQ minor NSR permit, Registration No. 74250 (June 24, 2025; supersedes the March 30, 2023 permit)
- Permits and dockets
- Virginia DEQ air permit Registration No. 74250 · Loudoun County new data center shell construction permit for IAD-159 (May 2026)