Phoenix data center filings, Q3 2026: two new data center buildings, both in Mesa, and none found in Phoenix's permit records.

The small hollow grey dots are data centers operating today, from the public PeeringDB facility list, each linked to its PeeringDB record. An operating building is context for the filings and is in no count on this page.

A Phoenix plan review is the filing, and the later permit is the issue.

County air applications are a separate series, listed below, not counted.

First applications at new sites, from county records and weekly reports to 26 September 2026. An air permit covers backup engines, not capacity.

1. 2 Jul 2025Phoenix council: data center special permit rule, 9-0 (G-7396).
2. 19 Nov 2025Phoenix council: first waiver, 9-0 (S-52436). Pinal County: La Osa and Project Midway plan amendments approved (summary).
3. 11 Dec 2025Chandler council: Price Road campus rezoning denied 7-0 (minutes).
4. 21 Jan 2026Phoenix council: second waiver, 8-1 (S-52435).
5. 4 Feb 2026Corporation Commission: Baccara Power gas plant certificate (release).
6. 25 Mar 2026Phoenix council: third waiver, Aligned, 7-1 (S-52717).
7. 13 May 2026Mesa zoning board: NTT Mesa PH10 rezoning on the agenda. No council vote on record.
8. 1 Jul 2026Phoenix council: fourth waiver, 5C Data Centers, 8-1 (S-53089).
9. 3 Aug 2026Casa Grande council: waiver of its data center use permit rule for about 480 acres, Resolution 5960, 7-0 (minutes).
10. 26 Aug 2026Pinal County: La Osa rezoning denied (summary).
11. 2 Sep 2026Maricopa County supervisors: Balterra (3-0) and Camelback Creek (4-0) rezonings approved (summary).
12. 30 Sep 2026Maricopa County: Baccara construction yard approved (UC260030).

Projects reported in the press or in a record that does not say what it builds. None of these is in the counts above.

• Avondale. QTS, eight buildings on 212 acres, approved July 2025 (PL-23-0205). Hermosa Ranch (PL-22-0094) and STACK (PL-22-0194) under construction.
• El Mirage. Microsoft PHX82 and PHX83 (SPA24-02-01, SPA24-09-01) and Compass PHX II (PZ22-11-31), under construction.
• Aligned, Reems Road, Glendale. City permit reports list a foundation at 8895 North Reems Road (22 July) and tenant improvements at 8907 (20 August), by an Aligned parcel, with no work description.
• Tonopah and Wintersburg. Hassayampa Ranch, Wintersburg 313, Camelback Creek and Balterra, rezonings with data center standards (March, May and August minutes). No operator or building permit.
• Mesa, no power figure. In Q3: CyrusOne's data hall (PMT26-17452) and Edged's cooling galleries (PMT26-12295). Earlier: NTT PH5 vaults (PMT25-23755 and related permits), Edged's busways (PMT26-00884), EdgeCore halls (PMT25-01071, PMT25-15477) and 3261 South Hawes Road (PMT25-09255, PMT25-17623).
• Phoenix, no power figure. Suites at 5100 East Roosevelt Street (25017747, 26003848, 26003918) and 4802 East Van Buren Street (26004581), QTS hall 1200 (25004476) and PhoenixNAP cooling (2601745).
• Novva, Mesa. About 159 acres at Warner and Ellsworth roads, site plan approved January 2025 (ZON24-00291), air application September 2025 (A0012859). No permit names it.
• Project Eagle, Waddell. A data center air application with 33 backup engines (A0014684) on the Project Baccara parcel (MCP250007). No building permit or operator.
• HEGIC North, Tonopah. A data center air application with its own generation (A0014418). Size and operator unconfirmed.
• Project Midway and W Holdings, Pinal County. Plan amendments approved November 2025 (county summary), Midway's for a data center on about 215 acres and W Holdings' for an energy and technology campus (staff report). Rezoning and operator unconfirmed.
• Buckeye Tech Corridor, Buckeye. A 2,109 acre master plan, approved August 2024 (PLZZ-23-00005) naming no operator or use. No Buckeye permit names a data center.

Covered. Besides the counted Mesa and Phoenix records: county air applications, planning records of Maricopa County, Avondale, El Mirage and Buckeye, Casa Grande planning and council records, Glendale permit reports, and actions of Phoenix, Mesa, Chandler, Maricopa County, Pinal County and the Arizona Corporation Commission.

Boundary, version 1. The Phoenix-Mesa-Chandler metro in OMB Bulletin 23-01 (July 2023): Maricopa and Pinal counties. Left out: Yavapai (Prescott metro), Gila (Payson) and Pima (Tucson metro) counties.

What is counted. Filings that add data center buildings or capacity: new buildings, planning cases for new sites, and work inside an existing data center whose filing states added power with a figure. Repairs, replacements and fire, sign or office work are not.

Decisions. The figure counts official Phoenix, Mesa, Maricopa County and Pinal County actions that approve, waive or deny a named data center project. Casa Grande is a city outside those authorities, the same reason its Grande Valley filing is not counted.

Counting. A site (one address or campus) counts once in a quarter it files, a project is dated by its first filing, and a planning case counts once. Certificates of occupancy are not counted, which is not a finding that none were issued.