HORSE FLAT
SubstationOregon · IDAHO POWER CO
HORSE FLAT is an electric transmission substation in Oregon, operated by IDAHO POWER CO. It is classified as high-voltage (230 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
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #70405 | 230 kV | IDAHO POWER CO | — | 83.1 mi |
| #70406 | 230 kV | IDAHO POWER CO | — | 19.5 mi |
| #70468 | 138 kV | IDAHO POWER CO | — | 34.6 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of HORSE FLAT, 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 |
|---|---|---|---|---|---|---|---|
| TAP204965 | Substation-Adjacent | ID | Washington County | 138 kV | 100 MW | 1.7 yrs | 61.8 |
| TAP207388 | Substation-Adjacent | ID | Adams County | 115 kV | 100 MW | 2.0 yrs | 60.6 |
| OXBOW | Substation-Adjacent | ID | Adams County | 230 kV | 300 MW | 1.7 yrs | 60.6 |
| HUNTER CREEK | Substation-Adjacent | ID | Adams County | 230 kV | 300 MW | 1.7 yrs | 60.6 |
| WEISER | Substation-Adjacent | ID | Washington County | 138 kV | 100 MW | 1.7 yrs | 60.5 |
| UNKNOWN204912 | Substation-Adjacent | ID | Adams County | 138 kV | 100 MW | 2.0 yrs | 59.5 |
| Greenfield (TAP207369 - BROWNLEE) | Greenfield | ID | Washington County | 230 kV | 300 MW | 1.7 yrs | 58.4 |
| BROWNLEE | Substation-Adjacent | ID | Adams County | 230 kV | 300 MW | 1.7 yrs | 58.4 |
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 HORSE FLAT 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.