RISER309417
SubstationCalifornia · AZUSA LIGHT & POWER
At a glance
RISER309417 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 |
|---|---|---|---|---|
| #304851 | 66 kV | AZUSA LIGHT & POWER | — | 0.6 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of RISER309417, 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 |
|---|---|---|---|---|---|---|---|
| STATION L (SCATTERGOOD) | Substation-Adjacent | CA | Los Angeles County | 230 kV | 300 MW | 7.6 yrs | 62.9 |
| STATION E (TOLUCA) | Substation-Adjacent | CA | Los Angeles County | 500 kV | 1,000 MW | 7.6 yrs | 62.6 |
| Broadway (CA) | Brownfield | CA | Los Angeles County | 66 kV | 167 MW | 7.6 yrs | 62.4 |
| STATION M(VALLEY) | Substation-Adjacent | CA | Los Angeles County | 230 kV | 300 MW | 7.6 yrs | 61.7 |
| AIRWAY | Substation-Adjacent | CA | Los Angeles County | 230 kV | 300 MW | 7.6 yrs | 61.3 |
| 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 |
Who owns the transmission lines at RISER309417?
The 1 connected line listed above is owned by AZUSA LIGHT & POWER. Line voltages range from 66 kV to 66 kV. Their combined recorded length is about 0.6 miles.
How do candidate sites near RISER309417 score?
The 8 highest-scoring candidate sites within about 25 miles range from 61 to 63 on the 0–100 DC Readiness scale. They fall in Los Angeles County, 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 RISER309417 substation?
RISER309417 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 RISER309417 is below the national midpoint.
How many transmission lines connect to RISER309417 substation?
1 transmission line terminate at or pass through RISER309417 in the HIFLD line data. The connected lines listed here run at 66 kV. Together the listed lines cover about 0.6 miles.
Who owns RISER309417 substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at RISER309417 belong to AZUSA LIGHT & POWER. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is RISER309417 substation located?
RISER309417 is in California at 33.9296, -118.0642. The datacenter candidate sites closest to it are in Los Angeles County, Orange County.
Are there datacenter candidate sites near RISER309417 substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of RISER309417. The highest-scoring is STATION L (SCATTERGOOD) at 63/100. 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, “RISER309417 substation, California”, https://gridcensus.com/substations/california/riser309417-5c0c1f6d (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 RISER309417 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.