CARLTON HILLS
SubstationCalifornia · SAN DIEGO GAS & ELECTRIC
At a glance
CARLTON HILLS is an electric transmission substation in California, on SAN DIEGO GAS & ELECTRIC's transmission network. It is classified as sub-transmission (138 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 |
|---|---|---|---|---|
| #310628 | 138 kV | SAN DIEGO GAS & ELECTRIC | IN SERVICE | 1.4 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of CARLTON HILLS, 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 |
|---|---|---|---|---|---|---|---|
| MIGUEL | Substation-Adjacent | CA | San Diego County | 500 kV | 1,000 MW | 7.6 yrs | 60.6 |
| SUNCREST | Substation-Adjacent | CA | San Diego County | 500 kV | 1,000 MW | 7.6 yrs | 58.0 |
| PENASQUITOS | Substation-Adjacent | CA | San Diego County | 230 kV | 300 MW | 7.6 yrs | 57.7 |
| MISSION | Substation-Adjacent | CA | San Diego County | 230 kV | 300 MW | 7.6 yrs | 57.6 |
| FRIARS | Substation-Adjacent | CA | San Diego County | 230 kV | 300 MW | 7.6 yrs | 57.6 |
| OLD TOWN | Substation-Adjacent | CA | San Diego County | 230 kV | 300 MW | 7.6 yrs | 57.4 |
| STATION F | Substation-Adjacent | CA | San Diego County | 230 kV | 300 MW | 7.6 yrs | 57.4 |
| CALPEAK PE 7 | Substation-Adjacent | CA | San Diego County | 230 kV | 300 MW | 7.6 yrs | 57.1 |
How does CARLTON HILLS 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. 697 named substations in the state are in CARLTON HILLS's 115–229 kV band (23% of named stations). 428 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 CARLTON HILLS?
The 1 connected line listed above is owned by SAN DIEGO GAS & ELECTRIC. Line voltages range from 138 kV to 138 kV. Their combined recorded length is about 1.4 miles.
How do candidate sites near CARLTON HILLS 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 San Diego 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 CARLTON HILLS substation?
CARLTON HILLS has a maximum voltage of 138 kV. That places it in the 115–229 kV band. The median named US substation in this dataset is 115 kV, so CARLTON HILLS is above the national midpoint.
How many transmission lines connect to CARLTON HILLS substation?
1 transmission line terminate at or pass through CARLTON HILLS in the HIFLD line data. The connected lines listed here run at 138 kV. Together the listed lines cover about 1.4 miles.
Who owns CARLTON HILLS substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at CARLTON HILLS belong to SAN DIEGO GAS & ELECTRIC. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is CARLTON HILLS substation located?
CARLTON HILLS is in California at 32.8549, -117.0120. The datacenter candidate sites closest to it are in San Diego County.
Are there datacenter candidate sites near CARLTON HILLS substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of CARLTON HILLS. The highest-scoring is MIGUEL at 61/100. Across California, the average DC Readiness score is 45.4.
Other 138 kV substations in California
- LA BREA· 8 lines
- STATION D (FAIRFAX)· 8 lines
- WILMINGTON (STATION C)· 8 lines
- GRAMERCY· 6 lines
- SOUTH BAY· 6 lines
- CARLTON HILLS TAP· 4 lines
- IMPERIAL TERMINAL TOWER· 4 lines
- STATION N (AIRPORT)· 4 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, “CARLTON HILLS substation, California”, https://gridcensus.com/substations/california/carlton-hills-483338cd (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 CARLTON HILLS 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.