JOHANNA
SubstationCalifornia · AZUSA LIGHT & POWER
JOHANNA is an electric transmission substation in California, operated by AZUSA LIGHT & POWER. It is classified as high-voltage (230 kv) and connects 2 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
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #84118 | 230 kV | AZUSA LIGHT & POWER | IN SERVICE | 8.2 mi |
| #89381 | 230 kV | AZUSA LIGHT & POWER | IN SERVICE | 6.1 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of JOHANNA, 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 |
|---|---|---|---|---|---|---|---|
| SERRANO | Substation-Adjacent | CA | Orange County | 500 kV | 1,000 MW | 5.7 yrs | 66.6 |
| HAYNES | Substation-Adjacent | CA | Orange County | 230 kV | 300 MW | 5.7 yrs | 66.0 |
| HUNTINGTON BEACH | Substation-Adjacent | CA | Orange County | 230 kV | 300 MW | 5.7 yrs | 65.7 |
| AES Alamitos LLC | Brownfield | CA | Orange | — | 940 MW | — | 65.5 |
| STATION F (VELASCO & KINETIC) | Substation-Adjacent | CA | Los Angeles County | 230 kV | 300 MW | 5.7 yrs | 64.2 |
| BARRE | Substation-Adjacent | CA | Orange County | 230 kV | 300 MW | 5.7 yrs | 64.1 |
| STATION P (MARKET) | Substation-Adjacent | CA | Los Angeles County | 230 kV | 300 MW | 5.7 yrs | 63.9 |
| RIVER | Substation-Adjacent | CA | Los Angeles County | 230 kV | 300 MW | 5.7 yrs | 63.8 |
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
This page shows a public slice of the GridCensus dataset for JOHANNA substation, California. Pro and Enterprise plans unlock the full 164,098-site catalog, raw sub-scores, parcel ownership, interconnection-queue detail, saved searches, and programmatic API access.