WEST JOHN DAY
SubstationOregon · IDAHO POWER CO
WEST JOHN DAY is an electric transmission substation in Oregon, operated by IDAHO POWER CO. It is classified as sub-transmission (138 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 |
|---|---|---|---|---|
| #70513 | 138 kV | IDAHO POWER CO | — | 65.9 mi |
| #72079 | 138 kV | IDAHO POWER CO | — | 67.3 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of WEST JOHN DAY, 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 |
|---|---|---|---|---|---|---|---|
| WEST JOHN DAY | Substation-Adjacent | OR | Grant County | 138 kV | 100 MW | 1.7 yrs | 56.3 |
| Greenfield (QUARTZ - WEST JOHN DAY) | Greenfield | OR | Grant County | 138 kV | 100 MW | 1.7 yrs | 53.1 |
| Greenfield (QUARTZ - WEST JOHN DAY) | Greenfield | OR | Grant County | 138 kV | 100 MW | 1.7 yrs | 52.8 |
| Greenfield (TAP207207 - SENECA) | Greenfield | OR | Grant County | 115 kV | 100 MW | 1.7 yrs | 51.6 |
| Greenfield (WEST JOHN DAY - UNKNOWN202641) | Greenfield | OR | Grant County | 138 kV | 100 MW | 1.7 yrs | 51.5 |
| Greenfield (QUARTZ - WEST JOHN DAY) | Greenfield | OR | Grant County | 138 kV | 100 MW | 1.7 yrs | 50.9 |
| Greenfield (WEST JOHN DAY - UNKNOWN202641) | Greenfield | OR | Grant County | 138 kV | 100 MW | 1.7 yrs | 49.9 |
| Greenfield (WEST JOHN DAY - UNKNOWN202641) | Greenfield | OR | Grant County | 138 kV | 100 MW | 1.7 yrs | 49.5 |
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 WEST JOHN DAY substation, Oregon. 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.