HORSE MESA DAM
Substation-AdjacentGila County, Arizona · WECC
At a glance
HORSE MESA DAM is a substation-adjacent datacenter candidate site in Gila County, Arizona, scoring 50.8/100 DC Readiness — 15th of 190 scored sites in the county. Its nearest substation is HORSE MESA DAM (0 mi, 115 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 100 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 HORSE MESA DAM compare with other sites in Gila County?
HORSE MESA DAM ranks 15th of 190 scored candidate sites in Gila County. Its 50.8/100 is about 14% above the county average of 44.5. It is roughly in line with the Arizona average of 48.5 and roughly in line with the national average of 53.2.
Against the Arizona average, its strongest sub-score is power availability (56 vs 34) and its weakest is fiber connectivity (47 vs 66). Power and speed to power each carry 20% of the composite score, fiber 12%, water 7% and hazard 6%.
How close is HORSE MESA DAM to power, fiber and other datacenters?
The nearest mapped substation, HORSE MESA DAM, is about 0 miles away and operates at 115 kV. For connectivity, the nearest internet exchange facility is EdgeCore Phoenix at 23.2 miles. 5 fiber providers report service at the location in FCC broadband data. The closest operating datacenter on record is NTT PH1 Datacenter, 22.5 miles away.
What are the flood, water and hazard risks at HORSE MESA DAM?
The site is in FEMA flood zone D, where flood risk has not been determined. At the county level, FEMA's National Risk Index rates Gila 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 Gila County, ranked by DC Readiness.
| Site | Type | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|
| SILVER KING | Substation-Adjacent | 500 kV | 1,000 MW | 3.5 yrs | 58.9 |
| OZ Gila | Greenfield | — | — | 3.5 yrs | 56.3 |
| OZ Gila | Greenfield | — | — | 3.5 yrs | 53.6 |
| OZ Gila | Greenfield | — | — | 3.5 yrs | 53.0 |
| STEWART MOUNTAIN DAM | Substation-Adjacent | 115 kV | 100 MW | 3.5 yrs | 52.9 |
| MAZATZAL | Substation-Adjacent | 345 kV | 600 MW | 3.5 yrs | 52.6 |
| PREACHER CANYON | Substation-Adjacent | 345 kV | 600 MW | 3.5 yrs | 52.6 |
| MORMON FLAT DAM | Substation-Adjacent | 115 kV | 100 MW | 3.5 yrs | 51.6 |
HORSE MESA DAM: common questions
What is the DC Readiness score of HORSE MESA DAM?
HORSE MESA DAM scores 50.8/100 on the GridCensus DC Readiness scale, rated fair. It ranks 15th of 190 scored sites in Gila County. The Gila County average is 44.5 and the Arizona average is 48.5.
What is the nearest substation to HORSE MESA DAM?
The nearest mapped substation is HORSE MESA DAM, about 0 miles away, at 115 kV. GridCensus catalogs 100 MW of candidate capacity for the site.
Which electric utility serves HORSE MESA DAM?
SALT RIVER PROJECT (political subdivision) holds the retail service territory that contains the site.
What grid region is HORSE MESA DAM in?
HORSE MESA DAM is in the WECC region. Projects interconnecting there have averaged a 3.5-year wait from queue request to operation.
Is HORSE MESA DAM in a flood zone?
The site is in FEMA flood zone D, where flood risk has not been determined.
How far is HORSE MESA DAM from an internet exchange?
The nearest internet exchange facility is EdgeCore Phoenix, about 23.2 miles away; 5 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, “HORSE MESA DAM, Gila County, AZ”, https://gridcensus.com/datacenter-sites/arizona/gila-county/horse-mesa-dam-1b82e929 (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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