ROBERTS
Substation-AdjacentSanta Cruz County, Arizona · WECC
At a glance
ROBERTS is a substation-adjacent datacenter candidate site in Santa Cruz County, Arizona, scoring 53.5/100 DC Readiness — 26th of 72 scored sites in the county. Its nearest substation is ROBERTS (0 mi, 138 kV). It sits in the WECC grid region and the TUCSON ELECTRIC POWER CO 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 ROBERTS compare with other sites in Santa Cruz County?
ROBERTS ranks 26th of 72 scored candidate sites in Santa Cruz County. Its 53.5/100 is roughly in line with the county average of 51.6. It is about 10% above 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 (58 vs 34) and its weakest is fiber connectivity (60 vs 66). Power and speed to power each carry 20% of the composite score, fiber 12%, water 7% and hazard 6%.
How close is ROBERTS to power, fiber and other datacenters?
The nearest mapped substation, ROBERTS, is about 0 miles away and operates at 138 kV. For connectivity, the nearest internet exchange facility is Simply Bits DC1 at 12.5 miles. 4 fiber providers report service at the location in FCC broadband data. The closest operating datacenter on record is DirecTV DC, 11.3 miles away.
What are the flood, water and hazard risks at ROBERTS?
The site is in FEMA flood zone X, outside the Special Flood Hazard Area (minimal or moderate flood risk). At the county level, FEMA's National Risk Index rates Santa Cruz 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 Santa Cruz County, ranked by DC Readiness.
| Site | Type | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|
| IRVINGTON | Substation-Adjacent | 230 kV | 300 MW | 3.5 yrs | 61.7 |
| VAIL | Substation-Adjacent | 345 kV | 600 MW | 3.5 yrs | 61.0 |
| SOUTH | Substation-Adjacent | 345 kV | 600 MW | 3.5 yrs | 60.2 |
| BICKNELL | Substation-Adjacent | 345 kV | 600 MW | 3.5 yrs | 58.7 |
| SAHUARITA | Substation-Adjacent | 230 kV | 300 MW | 3.5 yrs | 58.0 |
| OZ Santa Cruz | Greenfield | — | — | 3.5 yrs | 57.8 |
| UNKNOWN301866 | Substation-Adjacent | 230 kV | 300 MW | 3.5 yrs | 57.4 |
| PANTANO | Substation-Adjacent | 230 kV | 300 MW | 3.5 yrs | 56.8 |
ROBERTS: common questions
What is the DC Readiness score of ROBERTS?
ROBERTS scores 53.5/100 on the GridCensus DC Readiness scale, rated fair. It ranks 26th of 72 scored sites in Santa Cruz County. The Santa Cruz County average is 51.6 and the Arizona average is 48.5.
What is the nearest substation to ROBERTS?
The nearest mapped substation is ROBERTS, about 0 miles away, at 138 kV. GridCensus catalogs 100 MW of candidate capacity for the site.
Which electric utility serves ROBERTS?
TUCSON ELECTRIC POWER CO (investor owned) holds the retail service territory that contains the site; its holding company is UNS ELECTRIC INCORPORATED.
What grid region is ROBERTS in?
ROBERTS is in the WECC region. Projects interconnecting there have averaged a 3.5-year wait from queue request to operation.
Is ROBERTS 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 ROBERTS from an internet exchange?
The nearest internet exchange facility is Simply Bits DC1, about 12.5 miles away; 4 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, “ROBERTS, Santa Cruz County, AZ”, https://gridcensus.com/datacenter-sites/arizona/santa-cruz-county/roberts-1625a2b0 (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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