San Diego, San Diego County, CA
ScaleMatrix US-West 01
Why this stage: The City of San Diego issued building permits for an electrical service expansion at the data center building in 2020 and for generator work in 2024. The county air district lists three active emergency generator permits for ScaleMatrix at the address. None of these records names Cirrascale or a megawatt figure.
- Owner or developer
- ScaleMatrix, as operator. The building owner was not confirmed.
- Cirrascale's role
- Colocation tenant. The address is also Cirrascale's registered headquarters.
- Link to Cirrascale
- “operates several rows of cabinets at ScaleMatrix” Data Center Frontier (news; no primary source names Cirrascale's space in the building)
- Stated timing
- “Cirrascale says its US-West locations have enjoyed rapid adoption. It does not name the buildings.” Source
| Date | Record | What it shows | Source |
|---|---|---|---|
| December 5, 2020 | Building permitCity of San Diego Development Services Department · Approval 2477463, Project 675239 | Building permit for an electrical service expansion at an existing data center building at 5775 Kearny Villa Rd. One 2,000 amp SDG&E service is removed and two new 4,000 amp SDG&E services, new switchgear and two UPS systems are installed. Valuation $850,000.Status: Issued. The companion electrical permit closed as completed on 2025-01-08. | Record |
| December 22, 2021 | Building permitCity of San Diego Development Services Department · Approval 2519186, Project 685581 | Construction change adding a slab and foundation for a future chiller and a future generator at the same building.Status: Issued | Record |
| July 18, 2022 | Air permitSan Diego County Air Pollution Control District · APCD2022-PTO-004289 | Permit for an MTU 3,353 bhp diesel engine at the ScaleMatrix site, facility APCD2010-SITE-00573. This is a backup unit. Two more engines of the same size hold active permits APCD2011-PTO-000985 and APCD2011-PTO-000986.Stated capacity: “driving a 2,250-kW emergency electrical generator”Status: Active permit to operate | Record |
| October 16, 2024 | Building permitCity of San Diego Development Services Department · PMT-3306114, Project PRJ-1118564 | Building and electrical permits, filed by ScaleMatrix, for a new generator on a concrete foundation. Valuation $600,000. A separate permit, PMT-3300241, covers replacement of an existing generator.Status: Inspection follow-up. The electrical permit closed on 2025-01-09. | Record |
| January 8, 2026 | Public recordU.S. General Services Administration, SAM.gov · UEI UF4XBZNZ8MB1 | Federal contractor registration for Cirrascale Cloud Services LLC listing its physical address as 5775 Kearny Villa Rd, San Diego. It names no data center.Status: Registration activated January 8, 2026, as shown on the OpenGovUS mirror | Record |
Unverified: not found in online records
- No record states Cirrascale's megawatts or GPU count at this site.
- No SDG&E or CPUC approval record was found online. The 4,000 amp service upgrade is shown only in the city permit.
- The tie between Cirrascale and the data center space rests on 2017 news and its registered address. No current record names Cirrascale's space.
- No air district record for the 2024 new generator was found in the open dataset.
- The building owner was not confirmed from a primary source.

