FREMONT
SubstationIdaho · IDAHO POWER CO
At a glance
FREMONT is an electric transmission substation in Idaho, on IDAHO POWER CO's transmission network. It is classified as sub-transmission (138 kv) and connects 5 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 |
|---|---|---|---|---|
| #203135 | 161 kV | IDAHO POWER CO | — | 3.8 mi |
| #203131 | 138 kV | IDAHO POWER CO | — | 3.1 mi |
| #203169 | 69 kV | IDAHO POWER CO | — | 0.8 mi |
| #203170 | 69 kV | IDAHO POWER CO | — | 0.8 mi |
| #203171 | 46 kV | IDAHO POWER CO | — | 8.8 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of FREMONT, 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 |
|---|---|---|---|---|---|---|---|
| KINPORT | Substation-Adjacent | ID | Power County | 345 kV | 600 MW | 5.0 yrs | 62.0 |
| SUNBEAM | Substation-Adjacent | ID | Power County | 230 kV | 300 MW | 5.0 yrs | 59.6 |
| UNKNOWN207277 | Substation-Adjacent | ID | Bannock County | 115 kV | 100 MW | 5.0 yrs | 57.2 |
| UNKNOWN205004 | Substation-Adjacent | ID | Bannock County | 115 kV | 100 MW | 5.0 yrs | 57.2 |
| FREMONT | Substation-Adjacent | ID | Bannock County | 161 kV | 100 MW | 5.0 yrs | 57.1 |
| TAP207212 | Substation-Adjacent | ID | Bingham County | 138 kV | 100 MW | 5.0 yrs | 57.0 |
| TAP204750 | Substation-Adjacent | ID | Bingham County | 138 kV | 100 MW | 5.0 yrs | 57.0 |
| BLACKFOOT | Substation-Adjacent | ID | Bingham County | 138 kV | 100 MW | 5.0 yrs | 56.9 |
How does FREMONT 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 FREMONT'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 FREMONT?
The 5 connected lines listed above are owned by IDAHO POWER CO. Line voltages range from 46 kV to 161 kV. Their combined recorded length is about 17.2 miles.
How do candidate sites near FREMONT score?
The 8 highest-scoring candidate sites within about 25 miles range from 57 to 62 on the 0–100 DC Readiness scale. They fall in Power County, Bannock County, Bingham 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 FREMONT substation?
FREMONT has a maximum voltage of 161 kV and a minimum of 46 kV. That places it in the 115–229 kV band. The median named US substation in this dataset is 115 kV, so FREMONT is above the national midpoint.
How many transmission lines connect to FREMONT substation?
5 transmission lines terminate at or pass through FREMONT in the HIFLD line data. The connected lines listed here run at 161 kV, 138 kV, 69 kV, 46 kV. Together the listed lines cover about 17.2 miles.
Who owns FREMONT substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at FREMONT belong to IDAHO POWER CO. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is FREMONT substation located?
FREMONT is in Idaho at 42.8580, -112.4705. The datacenter candidate sites closest to it are in Power County, Bannock County, Bingham County.
Are there datacenter candidate sites near FREMONT substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of FREMONT. The highest-scoring is KINPORT at 62/100. Across Idaho, the average DC Readiness score is 51.7.
Other 161 kV substations in Idaho
- JEFFERSON· 7 lines
- SUGARLOAF· 6 lines
- DRUMMOND· 5 lines
- JOLLY HILL· 4 lines
- SWAN VALLEY· 4 lines
- BONNEVILLE· 3 lines
- WESTSIDE· 3 lines
- CINDER BUTTE· 2 lines
- All named substations in Idaho· 274 stations
- Datacenter candidate sites in Idaho· 2,171 sites
- Brownfield and retired plant sites in Idaho
- Substations by state
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, “FREMONT substation, Idaho”, https://gridcensus.com/substations/idaho/fremont-16770354 (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 FREMONT 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.