QUARTZ HILL
SubstationCalifornia · SOUTHERN CALIFORNIA EDISON
At a glance
QUARTZ HILL is an electric transmission substation in California, on SOUTHERN CALIFORNIA EDISON's transmission network. It is classified as distribution (<69 kv) and connects 4 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
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 |
|---|---|---|---|---|
| #305765 | 66 kV | AZUSA LIGHT & POWER | IN SERVICE | 5.3 mi |
| #313751 | 66 kV | SOUTHERN CALIFORNIA EDISON | IN SERVICE | 5.3 mi |
| #313755 | 66 kV | SOUTHERN CALIFORNIA EDISON | IN SERVICE | 5.6 mi |
| #313756 | 66 kV | SOUTHERN CALIFORNIA EDSION | IN SERVICE | 10.6 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of QUARTZ HILL, 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 |
|---|---|---|---|---|---|---|---|
| RINALDI | Substation-Adjacent | CA | Los Angeles County | 500 kV | 1,000 MW | 7.6 yrs | 60.9 |
| VINCENT | Substation-Adjacent | CA | Los Angeles County | 500 kV | 1,000 MW | 7.6 yrs | 59.8 |
| ANTELOPE | Substation-Adjacent | CA | Los Angeles County | 500 kV | 1,000 MW | 7.6 yrs | 58.5 |
| UNKNOWN300537 | Substation-Adjacent | CA | Los Angeles County | 345 kV | 600 MW | 7.6 yrs | 58.4 |
| WINDHUB | Substation-Adjacent | CA | Kern County | 500 kV | 1,000 MW | 7.6 yrs | 56.9 |
| WHIRLWIND | Substation-Adjacent | CA | Kern County | 500 kV | 1,000 MW | 7.6 yrs | 56.7 |
| OLIVE | Substation-Adjacent | CA | Los Angeles County | 230 kV | 300 MW | 7.6 yrs | 56.5 |
| CES Placerita Power Plant | Brownfield | CA | Los Angeles County | 66 kV | 60 MW | 7.6 yrs | 56.5 |
How does QUARTZ HILL compare with other substations in California?
California has 4,260 substation records in HIFLD, of which 3,003 carry a station name; the rest are unnamed tap points, risers and line ends. 1,439 named substations in the state are in QUARTZ HILL's below 69 kV band (48% of named stations). 1,504 sit in a higher band. 44 named substations in California 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 QUARTZ HILL?
The 4 connected lines listed above are owned by AZUSA LIGHT & POWER, SOUTHERN CALIFORNIA EDISON, SOUTHERN CALIFORNIA EDSION. Line voltages range from 66 kV to 66 kV. Their combined recorded length is about 26.8 miles.
How do candidate sites near QUARTZ HILL score?
The 8 highest-scoring candidate sites within about 25 miles range from 57 to 61 on the 0–100 DC Readiness scale. They fall in Los Angeles County, Kern 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 QUARTZ HILL substation?
QUARTZ HILL 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 QUARTZ HILL is below the national midpoint.
How many transmission lines connect to QUARTZ HILL substation?
4 transmission lines terminate at or pass through QUARTZ HILL in the HIFLD line data. The connected lines listed here run at 66 kV. Together the listed lines cover about 26.8 miles.
Who owns QUARTZ HILL substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at QUARTZ HILL belong to SOUTHERN CALIFORNIA EDISON, and others to AZUSA LIGHT & POWER, SOUTHERN CALIFORNIA EDSION. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is QUARTZ HILL substation located?
QUARTZ HILL is in California at 34.6597, -118.2281. The datacenter candidate sites closest to it are in Los Angeles County, Kern County.
Are there datacenter candidate sites near QUARTZ HILL substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of QUARTZ HILL. The highest-scoring is RINALDI at 61/100. Across California, the average DC Readiness score is 45.4.
Other 66 kV substations in California
- SATICOY· 7 lines
- BRIGGSMORE· 5 lines
- CAROLINA· 5 lines
- DELSUR· 5 lines
- FEDERALGEN TAP· 5 lines
- GANESHA· 5 lines
- HAMILTON· 5 lines
- JERSEY· 5 lines
- All named substations in California· 3,003 stations
- Datacenter candidate sites in California· 8,490 sites
- Brownfield and retired plant sites in California
- 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, “QUARTZ HILL substation, California”, https://gridcensus.com/substations/california/quartz-hill-71a24f1f (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 QUARTZ HILL 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.