RISER300066
SubstationCalifornia · SOUTHERN CALIFORNIA EDISON
At a glance
RISER300066 is an electric transmission substation in California, on SOUTHERN CALIFORNIA EDISON'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
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 |
|---|---|---|---|---|
| #308372 | 66 kV | SOUTHERN CALIFORNIA EDISON | IN SERVICE | 5.0 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of RISER300066, 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 |
|---|---|---|---|---|---|---|---|
| HUNTINGTON BEACH | Substation-Adjacent | CA | Orange County | 230 kV | 300 MW | 7.6 yrs | 61.0 |
| HAYNES | Substation-Adjacent | CA | Orange County | 230 kV | 300 MW | 7.6 yrs | 60.9 |
| SERRANO | Substation-Adjacent | CA | Orange County | 500 kV | 1,000 MW | 7.6 yrs | 60.8 |
| MIRA LOMA | Substation-Adjacent | CA | Orange County | 500 kV | 1,000 MW | 7.6 yrs | 59.2 |
| Anaheim GT | Brownfield | CA | Orange County | 66 kV | 49 MW | 7.6 yrs | 59.0 |
| COYOTE CREEK | Substation-Adjacent | CA | Orange County | 345 kV | 600 MW | 7.6 yrs | 58.6 |
| SAN ONOFRE | Substation-Adjacent | CA | Orange County | 230 kV | 300 MW | 7.6 yrs | 58.4 |
| JOHANNA | Substation-Adjacent | CA | Orange County | 230 kV | 300 MW | 7.6 yrs | 58.0 |
Who owns the transmission lines at RISER300066?
The 1 connected line listed above is owned by SOUTHERN CALIFORNIA EDISON. Line voltages range from 66 kV to 66 kV. Their combined recorded length is about 5 miles.
How do candidate sites near RISER300066 score?
The 8 highest-scoring candidate sites within about 25 miles range from 58 to 61 on the 0–100 DC Readiness scale. They fall in Orange 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 RISER300066 substation?
RISER300066 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 RISER300066 is below the national midpoint.
How many transmission lines connect to RISER300066 substation?
1 transmission line terminate at or pass through RISER300066 in the HIFLD line data. The connected lines listed here run at 66 kV. Together the listed lines cover about 5 miles.
Who owns RISER300066 substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at RISER300066 belong to SOUTHERN CALIFORNIA EDISON. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is RISER300066 substation located?
RISER300066 is in California at 33.6141, -117.7001. The datacenter candidate sites closest to it are in Orange County.
Are there datacenter candidate sites near RISER300066 substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of RISER300066. The highest-scoring is HUNTINGTON BEACH at 61/100. 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, “RISER300066 substation, California”, https://gridcensus.com/substations/california/riser300066-db4746df (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 RISER300066 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.