ELK HORN
SubstationIdaho · IDAHO POWER CO
At a glance
ELK HORN is an electric transmission substation in Idaho, on IDAHO POWER CO's transmission network. 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 |
|---|---|---|---|---|
| #203345 | 138 kV | IDAHO POWER CO | — | 10.4 mi |
| #203346 | 138 kV | IDAHO POWER CO | — | 2.0 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of ELK HORN, 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 |
|---|---|---|---|---|---|---|---|
| ELK HORN | Substation-Adjacent | ID | Camas County | 138 kV | 100 MW | 5.0 yrs | 54.9 |
| KETCHUM | Substation-Adjacent | ID | Camas County | 138 kV | 100 MW | 5.0 yrs | 54.8 |
| WOOD RIVER | Substation-Adjacent | ID | Blaine County | 138 kV | 100 MW | 5.0 yrs | 54.6 |
| HAILEY | Substation-Adjacent | ID | Blaine County | 138 kV | 100 MW | 5.0 yrs | 54.4 |
| MOONSTONE | Substation-Adjacent | ID | Camas County | 138 kV | 100 MW | 5.0 yrs | 53.3 |
| TAP204840 | Substation-Adjacent | ID | Camas County | 138 kV | 100 MW | 5.0 yrs | 53.0 |
| UNKNOWN206542 | Substation-Adjacent | ID | Blaine County | 69 kV | 50 MW | 5.0 yrs | 50.8 |
| SILVER | Substation-Adjacent | ID | Blaine County | 138 kV | 100 MW | 5.0 yrs | 50.4 |
How does ELK HORN compare with other substations in Idaho?
Idaho has 897 substation records in HIFLD, of which 274 carry a station name; the rest are unnamed tap points, risers and line ends. 149 named substations in the state are in ELK HORN's 115–229 kV band (54% of named stations). 44 sit in a higher band. 11 named substations in Idaho operate at 345 kV or above. The highest voltage recorded in the state is 500 kV, and the state median is 138 kV.
Who owns the transmission lines at ELK HORN?
The 2 connected lines listed above are owned by IDAHO POWER CO. Line voltages range from 138 kV to 138 kV. Their combined recorded length is about 12.4 miles.
How do candidate sites near ELK HORN score?
The 8 highest-scoring candidate sites within about 25 miles range from 50 to 55 on the 0–100 DC Readiness scale. They fall in Camas County, Blaine County. The Idaho average across 2,171 scored sites is 51.7. 646 of those Idaho sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is ELK HORN substation?
ELK HORN has a maximum voltage of 138 kV. That places it in the 115–229 kV band. The median named US substation in this dataset is 115 kV, so ELK HORN is above the national midpoint.
How many transmission lines connect to ELK HORN substation?
2 transmission lines terminate at or pass through ELK HORN in the HIFLD line data. The connected lines listed here run at 138 kV. Together the listed lines cover about 12.4 miles.
Who owns ELK HORN substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at ELK HORN belong to IDAHO POWER CO. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is ELK HORN substation located?
ELK HORN is in Idaho at 43.6684, -114.3278. The datacenter candidate sites closest to it are in Camas County, Blaine County.
Are there datacenter candidate sites near ELK HORN substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of ELK HORN. The highest-scoring is ELK HORN at 55/100. Across Idaho, the average DC Readiness score is 51.7.
Other 138 kV substations in Idaho
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, “ELK HORN substation, Idaho”, https://gridcensus.com/substations/idaho/elk-horn-0ddabf06 (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 ELK HORN substation, Idaho 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.