ALTADENA
SubstationArizona · ARIZONA PUBLIC SERVICE COMPANY
At a glance
ALTADENA is an electric transmission substation in Arizona, on ARIZONA PUBLIC SERVICE COMPANY's transmission network. It is classified as distribution (69–115 kv) and connects 1 transmission line. 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
Ownership
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #302370 | 69 kV | ARIZONA PUBLIC SERVICE COMPANY | — | 3.7 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of ALTADENA, 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 |
|---|---|---|---|---|---|---|---|
| KYRENE | Substation-Adjacent | AZ | Maricopa County | 500 kV | 1,000 MW | 3.5 yrs | 66.0 |
| BROWNING | Substation-Adjacent | AZ | Pinal County | 500 kV | 1,000 MW | 3.5 yrs | 65.7 |
| PINNACLE PEAK APS | Substation-Adjacent | AZ | Maricopa County | 500 kV | 1,000 MW | 3.5 yrs | 64.7 |
| WARD | Substation-Adjacent | AZ | Maricopa County | 230 kV | 300 MW | 3.5 yrs | 63.3 |
| EC Near Crosscut | Greenfield | AZ | Maricopa | — | — | 3.5 yrs | 63.2 |
| OZ Maricopa | Greenfield | AZ | Maricopa | — | — | 3.5 yrs | 62.9 |
| OZ Maricopa | Greenfield | AZ | Maricopa | — | — | 3.5 yrs | 62.8 |
| EC Near Crosscut | Greenfield | AZ | Maricopa | — | — | 3.5 yrs | 62.6 |
How does ALTADENA 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. 231 named substations in the state are in ALTADENA's 69–114 kV band (50% of named stations). 225 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 ALTADENA?
The 1 connected line listed above is owned by ARIZONA PUBLIC SERVICE COMPANY. Line voltages range from 69 kV to 69 kV. Their combined recorded length is about 3.7 miles.
How do candidate sites near ALTADENA score?
The 8 highest-scoring candidate sites within about 25 miles range from 63 to 66 on the 0–100 DC Readiness scale. They fall in Maricopa County, Pinal County, Maricopa. 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 ALTADENA substation?
ALTADENA has a maximum voltage of 69 kV. That places it in the 69–114 kV band. The median named US substation in this dataset is 115 kV, so ALTADENA is below the national midpoint.
How many transmission lines connect to ALTADENA substation?
1 transmission line terminate at or pass through ALTADENA in the HIFLD line data. The connected lines listed here run at 69 kV. Together the listed lines cover about 3.7 miles.
Who owns ALTADENA substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at ALTADENA belong to ARIZONA PUBLIC SERVICE COMPANY. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is ALTADENA substation located?
ALTADENA is in Arizona at 33.5912, -111.8390. The datacenter candidate sites closest to it are in Maricopa County, Pinal County, Maricopa.
Are there datacenter candidate sites near ALTADENA substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of ALTADENA. The highest-scoring is KYRENE at 66/100. Across Arizona, the average DC Readiness score is 48.5.
Other 69 kV substations in Arizona
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, “ALTADENA substation, Arizona”, https://gridcensus.com/substations/arizona/altadena-0207a3e6 (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 ALTADENA 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.