TAP307979
SubstationCalifornia · SOUTHERN CALIFORNIA EDISON
At a glance
TAP307979 is an electric transmission substation in California, on SOUTHERN CALIFORNIA EDISON'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
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 |
|---|---|---|---|---|
| #313897 | 115 kV | SOUTHERN CALIFORNIA EDISON | IN SERVICE | 2.3 mi |
| #313911 | 115 kV | SOUTHERN CALIFORNIA EDISON | IN SERVICE | 0.7 mi |
| #313912 | 115 kV | SOUTHERN CALIFORNIA EDISON | IN SERVICE | 1.0 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TAP307979, 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 |
|---|---|---|---|---|---|---|---|
| DEVERS | Substation-Adjacent | CA | Riverside County | 500 kV | 1,000 MW | 7.6 yrs | 57.7 |
| EL CASCO | Substation-Adjacent | CA | Orange County | 230 kV | 300 MW | 7.6 yrs | 54.8 |
| OZ Riverside | Greenfield | CA | Riverside | — | — | 7.6 yrs | 54.7 |
| OZ Riverside | Greenfield | CA | Riverside | — | — | 7.6 yrs | 54.2 |
| OZ Riverside | Greenfield | CA | Riverside | — | — | 7.6 yrs | 54.1 |
| GOLDHILL | Substation-Adjacent | CA | San Bernardino County | 230 kV | 300 MW | 7.6 yrs | 53.3 |
| UNKNOWN307724 | Substation-Adjacent | CA | Riverside County | 230 kV | 300 MW | 7.6 yrs | 53.2 |
| MIRAGE | Substation-Adjacent | CA | Riverside County | 230 kV | 300 MW | 7.6 yrs | 53.2 |
Who owns the transmission lines at TAP307979?
The 3 connected lines listed above are owned by SOUTHERN CALIFORNIA EDISON. Line voltages range from 115 kV to 115 kV. Their combined recorded length is about 4 miles.
How do candidate sites near TAP307979 score?
The 8 highest-scoring candidate sites within about 25 miles range from 53 to 58 on the 0–100 DC Readiness scale. They fall in Riverside County, Orange County, Riverside, San Bernardino 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 TAP307979 substation?
TAP307979 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 TAP307979 is at the national midpoint.
How many transmission lines connect to TAP307979 substation?
3 transmission lines terminate at or pass through TAP307979 in the HIFLD line data. The connected lines listed here run at 115 kV. Together the listed lines cover about 4 miles.
Who owns TAP307979 substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at TAP307979 belong to SOUTHERN CALIFORNIA EDISON. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is TAP307979 substation located?
TAP307979 is in California at 33.9254, -116.7197. The datacenter candidate sites closest to it are in Riverside County, Orange County, Riverside.
Are there datacenter candidate sites near TAP307979 substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of TAP307979. The highest-scoring is DEVERS at 58/100. 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, “TAP307979 substation, California”, https://gridcensus.com/substations/california/tap307979-932398c3 (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 TAP307979 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.