Compass PHX II Campus Compass Datacenters
Microsoft PHX-83 (El Mirage campus expansion)
Microsoft. Filed.
Microsoft has filed a site plan amendment for PHX-83, a 245,500 square foot data center building at its existing campus on West Olive Avenue, part of a footprint that has grown to more than 400 acres in the El Mirage area since Microsoft first acquired 150 acres there in 2019.
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- Status
- Filed
- Operator
- Microsoft
- Applicant on record
- Microsoft
- Location
- 12901 W Olive Ave, El Mirage, AZ, Maricopa County, AZ
- Size
- MW not reported, 245,500 sq ft
- Cooling
- Not reported
- Utility
- Arizona Public Service
- Last updated
- August 19, 2026
What happens next
Still to come: public hearings, a rezoning or permit vote, and a utility interconnection agreement.
Sources
- Microsoft files to expand El Mirage data center campus in Arizona, Data Center Dynamics, 2026
- Microsoft acquires nearly 300 acres for data center growth in El Mirage, ABC15 Arizona, 2026
What it would mean nearby
Arizona Public Service is asking the commission for a 16.4% residential increase (2025 general rate case (docket E-01345A-25-0105)). On a $160 monthly bill that is about $22 to $30 a month.
For how far this is from your own address, check it here. For a noise, water, and power bill estimate for one address, see the address report.
Other tracked projects within 25 miles
Project Baccara Operator not disclosed
Aligned PHX-13 (Glendale campus) Aligned Data Centers
Microsoft PHX-10 Goodyear Campus Microsoft
Vantage AZ1 Goodyear Campus Vantage Data Centers
Common questions
Where is the Microsoft PHX-83 (El Mirage campus expansion) data center?
It is in El Mirage, Maricopa County, AZ.
Has the Microsoft PHX-83 (El Mirage campus expansion) data center been approved?
Not yet. An application has been filed and has not been decided.
How big is the Microsoft PHX-83 (El Mirage campus expansion) data center?
Reported size: 245,500 square feet.
Is it near you?
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