TAP310858
SubstationCalifornia · AZUSA LIGHT & POWER
At a glance
TAP310858 is an electric transmission substation in California, on AZUSA LIGHT & POWER's transmission network. It is classified as distribution (<69 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
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #300519 | 66 kV | AZUSA LIGHT & POWER | IN SERVICE | 0.5 mi |
| #301618 | 66 kV | AZUSA LIGHT & POWER | — | 4.6 mi |
| #301619 | 66 kV | AZUSA LIGHT & POWER | IN SERVICE | 2.6 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TAP310858, 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 |
|---|---|---|---|---|---|---|---|
| VALLEY | Substation-Adjacent | CA | Orange County | 500 kV | 1,000 MW | 7.6 yrs | 62.3 |
| INLAND EMPIRE | Substation-Adjacent | CA | Orange County | 500 kV | 1,000 MW | 7.6 yrs | 62.3 |
| SAN BERNARDINO | Substation-Adjacent | CA | Orange County | 500 kV | 1,000 MW | 7.6 yrs | 60.2 |
| MIRA LOMA | Substation-Adjacent | CA | Orange County | 500 kV | 1,000 MW | 7.6 yrs | 59.2 |
| LINDE | Substation-Adjacent | CA | Orange County | 500 kV | 1,000 MW | 7.6 yrs | 58.9 |
| RANCHO VISTA | Substation-Adjacent | CA | Orange County | 500 kV | 1,000 MW | 7.6 yrs | 58.8 |
| LUGO | Substation-Adjacent | CA | Los Angeles County | 500 kV | 1,000 MW | 7.6 yrs | 57.6 |
| Amazon San Bernardino | Brownfield | CA | Orange County | 500 kV | 1 MW | 7.6 yrs | 57.2 |
Who owns the transmission lines at TAP310858?
The 3 connected lines listed above are owned by AZUSA LIGHT & POWER. Line voltages range from 66 kV to 66 kV. Their combined recorded length is about 7.7 miles.
How do candidate sites near TAP310858 score?
The 8 highest-scoring candidate sites within about 25 miles range from 57 to 62 on the 0–100 DC Readiness scale. They fall in Orange County, Los Angeles County. The California average across 8,490 scored sites is 45.4. 1,573 of those California sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is TAP310858 substation?
TAP310858 has a maximum voltage of 66 kV. That places it in the below 69 kV band. The median named US substation in this dataset is 115 kV, so TAP310858 is below the national midpoint.
How many transmission lines connect to TAP310858 substation?
1 transmission line terminate at or pass through TAP310858 in the HIFLD line data. The connected lines listed here run at 66 kV. Together the listed lines cover about 7.7 miles.
Who owns TAP310858 substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at TAP310858 belong to AZUSA LIGHT & POWER. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is TAP310858 substation located?
TAP310858 is in California at 34.0810, -117.1736. The datacenter candidate sites closest to it are in Orange County, Los Angeles County.
Are there datacenter candidate sites near TAP310858 substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of TAP310858. The highest-scoring is VALLEY at 62/100. Across California, the average DC Readiness score is 45.4.
More in California
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, “TAP310858 substation, California”, https://gridcensus.com/substations/california/tap310858-407a7d7e (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 TAP310858 substation, California 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.