Williams Air Force Base
BrownfieldMaricopa County, Arizona · WECC
At a glance
Williams Air Force Base is a brownfield datacenter candidate site in Maricopa County, Arizona, scoring 62.4/100 DC Readiness — 12th of 1,170 scored sites in the county. Its nearest substation is UNKNOWN305997 (0.6 mi, 69 kV). It sits in the WECC grid region and the SALT RIVER PROJECT service territory, where interconnection has averaged 3.5 years from request to operation. GridCensus catalogs 2 MW of candidate capacity here.
Power & interconnection
Speed to power
Deep queue and long historical waits — plan for a multi-year interconnection timeline and engage the utility early.
Connectivity
Site characteristics
Risk & environment
Location context
Regulatory climate
Sales-tax exemption suspended Jul 2026–Jun 2029; water constraints add scrutiny.
Incentive detail: Government Property Lease Excise Tax (GPLET) for qualified facilities on government land.
Site location
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How does Williams Air Force Base compare with other sites in Maricopa County?
Williams Air Force Base ranks 12th of 1,170 scored candidate sites in Maricopa County. Its 62.4/100 is about 21% above the county average of 51.6. It is about 29% above the Arizona average of 48.5 and about 17% above the national average of 53.2.
Against the Arizona average, its strongest sub-score is water (49 vs 17) and its weakest is natural hazard (68 vs 77). Power and speed to power each carry 20% of the composite score, fiber 12%, water 7% and hazard 6%.
How close is Williams Air Force Base to power, fiber and other datacenters?
The nearest mapped substation, UNKNOWN305997, is about 0.6 miles away and operates at 69 kV. For connectivity, the nearest internet exchange facility is EdgeCore Phoenix at 6.7 miles. 27 fiber providers report service at the location in FCC broadband data. The closest operating datacenter on record is Apple Mesa, 1.4 miles away.
What are the flood, water and hazard risks at Williams Air Force Base?
The site is in FEMA flood zone X, outside the Special Flood Hazard Area (minimal or moderate flood risk). WRI rates baseline water stress at 4.20 on a 0–5 scale. No mapped wetlands are recorded on the parcel. A Superfund site is nearby (MADISON ELEMENTARY SCHOOL). At the county level, FEMA's National Risk Index rates Maricopa County "Relatively Low".
Full DC Readiness breakdown
All 13 weighted sub-scores (0–100) behind the composite DC Readiness score.
Nearby comparable sites
Other scored datacenter candidate sites in Maricopa County, ranked by DC Readiness.
| Site | Type | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|
| KYRENE | Substation-Adjacent | 500 kV | 1,000 MW | 3.5 yrs | 66.0 |
| RUDD | Substation-Adjacent | 500 kV | 1,000 MW | 3.5 yrs | 65.9 |
| PINNACLE PEAK APS | Substation-Adjacent | 500 kV | 1,000 MW | 3.5 yrs | 64.7 |
| WESTWING | Substation-Adjacent | 500 kV | 1,000 MW | 3.5 yrs | 64.1 |
| MORGAN | Substation-Adjacent | 500 kV | 1,000 MW | 3.5 yrs | 63.6 |
| WARD | Substation-Adjacent | 230 kV | 300 MW | 3.5 yrs | 63.3 |
| EC Near Crosscut | Greenfield | — | — | 3.5 yrs | 63.2 |
| OZ Maricopa | Greenfield | — | — | 3.5 yrs | 62.9 |
Williams Air Force Base: common questions
What is the DC Readiness score of Williams Air Force Base?
Williams Air Force Base scores 62.4/100 on the GridCensus DC Readiness scale, rated good. It ranks 12th of 1,170 scored sites in Maricopa County. The Maricopa County average is 51.6 and the Arizona average is 48.5.
What is the nearest substation to Williams Air Force Base?
The nearest mapped substation is UNKNOWN305997, about 0.6 miles away, at 69 kV. GridCensus catalogs 2 MW of candidate capacity for the site.
Which electric utility serves Williams Air Force Base?
SALT RIVER PROJECT (political subdivision) holds the retail service territory that contains the site.
What grid region is Williams Air Force Base in?
Williams Air Force Base is in the WECC region. Projects interconnecting there have averaged a 3.5-year wait from queue request to operation.
Is Williams Air Force Base in a flood zone?
The site is in FEMA flood zone X, outside the Special Flood Hazard Area (minimal or moderate flood risk).
How far is Williams Air Force Base from an internet exchange?
The nearest internet exchange facility is EdgeCore Phoenix, about 6.7 miles away; 27 fiber providers report service at the location.
Related pages
About this data
Source: GridCensus composite of HIFLD transmission and substation data, EIA, FEMA National Risk Index, FCC broadband data, PeeringDB and ISO interconnection queues, as published October 10, 2026 — GridCensus refreshes it monthly. See the methodology for how records are matched, cleaned and scored.
Cite as: GridCensus, “Williams Air Force Base, Maricopa County, AZ”, https://gridcensus.com/datacenter-sites/arizona/maricopa-county/williams-air-force-base-27fdb9c9 (data as of October 10, 2026).
Dataset updated . Screening estimates derived from public data sources.
Figures are screening estimates derived from public infrastructure data. Catalogued capacity reflects theoretical candidate capacity, not deliverable or committed interconnection. Confirm all values with the utility, ISO, and on-the-ground due diligence.
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