THREE POINTS
SubstationArizona · TRICO ELECTRIC COOPERATIVE
At a glance
THREE POINTS is an electric transmission substation in Arizona, on TRICO ELECTRIC COOPERATIVE's transmission network. It is classified as sub-transmission (115 kv) and connects 3 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 |
|---|---|---|---|---|
| #300284 | 115 kV | TRICO ELECTRIC COOPERATIVE | IN SERVICE | 15.7 mi |
| #307125 | 115 kV | — | IN SERVICE | 19.3 mi |
| #309890 | 115 kV | — | IN SERVICE | 11.5 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of THREE POINTS, 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 |
|---|---|---|---|---|---|---|---|
| OZ Pima | Greenfield | AZ | Pima | — | — | 3.5 yrs | 62.8 |
| TUCSON | Substation-Adjacent | AZ | Pima County | 345 kV | 600 MW | 3.5 yrs | 62.7 |
| OZ Pima | Greenfield | AZ | Pima | — | — | 3.5 yrs | 62.4 |
| IRVINGTON | Substation-Adjacent | AZ | Santa Cruz County | 230 kV | 300 MW | 3.5 yrs | 61.7 |
| OZ Pima | Greenfield | AZ | Pima | — | — | 3.5 yrs | 61.6 |
| OZ Pima | Greenfield | AZ | Pima | — | — | 3.5 yrs | 60.6 |
| SOUTH | Substation-Adjacent | AZ | Santa Cruz County | 345 kV | 600 MW | 3.5 yrs | 60.2 |
| EC Near H Wilson Sundt Generating Station | Greenfield | AZ | Pima | — | — | 3.5 yrs | 60.0 |
How does THREE POINTS compare with other substations in Arizona?
Arizona has 892 substation records in HIFLD, of which 466 carry a station name; the rest are unnamed tap points, risers and line ends. 87 named substations in the state are in THREE POINTS's 115–229 kV band (19% of named stations). 138 sit in a higher band. 47 named substations in Arizona operate at 345 kV or above. The highest voltage recorded in the state is 500 kV, and the state median is 69 kV.
Who owns the transmission lines at THREE POINTS?
The 3 connected lines listed above are owned by TRICO ELECTRIC COOPERATIVE. Line voltages range from 115 kV to 115 kV. Their combined recorded length is about 46.5 miles.
How do candidate sites near THREE POINTS score?
The 8 highest-scoring candidate sites within about 25 miles range from 60 to 63 on the 0–100 DC Readiness scale. They fall in Pima, Pima County, Santa Cruz County. The Arizona average across 3,816 scored sites is 48.5. 614 of those Arizona sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is THREE POINTS substation?
THREE POINTS has a maximum voltage of 115 kV. That places it in the 115–229 kV band. The median named US substation in this dataset is 115 kV, so THREE POINTS is at the national midpoint.
How many transmission lines connect to THREE POINTS substation?
3 transmission lines terminate at or pass through THREE POINTS in the HIFLD line data. The connected lines listed here run at 115 kV. Together the listed lines cover about 46.5 miles.
Who owns THREE POINTS substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at THREE POINTS belong to TRICO ELECTRIC COOPERATIVE. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is THREE POINTS substation located?
THREE POINTS is in Arizona at 32.0945, -111.2856. The datacenter candidate sites closest to it are in Pima, Pima County, Santa Cruz County.
Are there datacenter candidate sites near THREE POINTS substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of THREE POINTS. The highest-scoring is OZ Pima at 63/100. Across Arizona, the average DC Readiness score is 48.5.
Other 115 kV substations in Arizona
- ORACLE JUNCTION· 5 lines
- DEL BAC· 4 lines
- ADAMS· 3 lines
- FRAZIER· 3 lines
- HAYDEN· 3 lines
- HORSE MESA DAM· 3 lines
- KARTCHNER· 3 lines
- MARANA TAP· 3 lines
- All named substations in Arizona· 466 stations
- Datacenter candidate sites in Arizona· 3,816 sites
- Brownfield and retired plant sites in Arizona
- Substations by state
About this data
Source: HIFLD Electric Substations and Transmission Lines (U.S. Department of Homeland Security), as published June 29, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: GridCensus, “THREE POINTS substation, Arizona”, https://gridcensus.com/substations/arizona/three-points-f90f0de3 (data as of June 29, 2026).
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
Every site and score for THREE POINTS substation, Arizona is free to browse. Pro adds Watchtower on 25 sites, alerts when new candidate sites, datacenters or interconnection-queue requests appear in your markets, score and capacity history, and CSV export. Enterprise adds team seats, weekly data files for all 147,272 sites, the REST API and an MCP server for AI tools.