SOUTH
SubstationArizona · TUCSON ELECTRIC POWER COMPANY
SOUTH is an electric transmission substation in Arizona, operated by TUCSON ELECTRIC POWER COMPANY. It is classified as high-voltage (345 kv) and connects 7 transmission lines. Substation proximity is one of the strongest speed-to-power signals for siting a datacenter — interconnection distance to an energized, high-voltage bus is often the binding constraint on time-to-energization.
Voltage & classification
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #91336 | 345 kV | — | IN SERVICE | 117.2 mi |
| #92675 | 345 kV | TUCSON ELECTRIC POWER COMPANY | IN SERVICE | 14.0 mi |
| #83063 | 138 kV | — | IN SERVICE | 15.5 mi |
| #82027 | 138 kV | TUCSON ELECTRIC POWER COMPANY | IN SERVICE | 13.0 mi |
| #86779 | 138 kV | — | IN SERVICE | 5.7 mi |
| #85432 | 138 kV | TUCSON ELECTRIC POWER COMPANY | IN SERVICE | 15.8 mi |
| #82686 | 138 kV | TUCSON ELECTRIC POWER COMPANY | IN SERVICE | 14.7 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of SOUTH, ranked by DC Readiness. Sites this close to an energized substation carry a strong speed-to-power advantage.
| Site | Type | State | County | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|---|---|
| VAIL | Substation-Adjacent | AZ | Santa Cruz County | 345 kV | 600 MW | 3.5 yrs | 69.7 |
| SOUTH | Substation-Adjacent | AZ | Santa Cruz County | 345 kV | 600 MW | 5.7 yrs | 67.3 |
| TUCSON | Substation-Adjacent | AZ | Pima County | 138 kV | 100 MW | 5.7 yrs | 64.9 |
| SAHUARITA | Substation-Adjacent | AZ | Santa Cruz County | 230 kV | 300 MW | 5.7 yrs | 64.8 |
| SANTA CRUZ | Substation-Adjacent | AZ | Pima County | 138 kV | 100 MW | 5.7 yrs | 64.8 |
| UNKNOWN301866 | Substation-Adjacent | AZ | Santa Cruz County | 230 kV | 300 MW | 5.7 yrs | 64.5 |
| SNYDER | Substation-Adjacent | AZ | Pinal County | 138 kV | 100 MW | 5.7 yrs | 64.4 |
| Greenfield (SPRINGERVILLE - VAIL) | Greenfield | AZ | Santa Cruz County | 345 kV | 600 MW | 3.5 yrs | 63.4 |
Dataset updated . Screening estimates derived from public data sources.
Substation attributes are derived from public HIFLD / EIA infrastructure data and may lag real-world upgrades or retirements. Voltage and connected-line counts are screening figures — confirm available capacity and interconnection terms directly with the operating utility and ISO.
Go deeper than the public screen
This page shows a public slice of the GridCensus dataset for SOUTH substation, Arizona. Pro and Enterprise plans unlock the full 164,098-site catalog, raw sub-scores, parcel ownership, interconnection-queue detail, saved searches, and programmatic API access.