BANNACK
SubstationMontana · IDAHO POWER CO
At a glance
BANNACK is an electric transmission substation in Montana, on IDAHO POWER CO's transmission network. It is classified as distribution (69–115 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
Ownership
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #202352 | 69 kV | IDAHO POWER CO | — | 0.1 mi |
| #209191 | 46 kV | VIGILANTE ELECTRIC COOP, INC | — | 40.1 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of BANNACK, 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 |
|---|---|---|---|---|---|---|---|
| UNKNOWN205102 | Substation-Adjacent | MT | Beaverhead County | 115 kV | 100 MW | 1.1 yrs | 57.5 |
| DILLON-SALMON | Substation-Adjacent | MT | Beaverhead County | 115 kV | 100 MW | 1.1 yrs | 57.1 |
| UNKNOWN204584 | Substation-Adjacent | MT | Beaverhead County | 69 kV | 50 MW | 1.1 yrs | 55.3 |
| UNKNOWN204585 | Substation-Adjacent | MT | Beaverhead County | 69 kV | 50 MW | 1.1 yrs | 55.3 |
| PETERSON FLATS | Substation-Adjacent | MT | Beaverhead County | 69 kV | 50 MW | 1.1 yrs | 54.9 |
| BANNACK | Substation-Adjacent | MT | Beaverhead County | 69 kV | 50 MW | 1.1 yrs | 54.4 |
| UNKNOWN207236 | Substation-Adjacent | MT | Beaverhead County | 69 kV | 50 MW | 1.1 yrs | 54.3 |
| East Bench (P-S) | Federal Excess | MT | Beaverhead County | — | — | 1.1 yrs | 52.0 |
How does BANNACK compare with other substations in Montana?
Montana has 1,211 substation records in HIFLD, of which 149 carry a station name; the rest are unnamed tap points, risers and line ends. 58 named substations in the state are in BANNACK's 69–114 kV band (39% of named stations). 84 sit in a higher band. 5 named substations in Montana operate at 345 kV or above. The highest voltage recorded in the state is 500 kV, and the state median is 115 kV.
Who owns the transmission lines at BANNACK?
The 2 connected lines listed above are owned by IDAHO POWER CO, VIGILANTE ELECTRIC COOP, INC. Line voltages range from 46 kV to 69 kV. Their combined recorded length is about 40.2 miles.
How do candidate sites near BANNACK score?
The 8 highest-scoring candidate sites within about 25 miles range from 52 to 58 on the 0–100 DC Readiness scale. They fall in Beaverhead County. The Montana average across 2,542 scored sites is 54.3. 815 of those Montana sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is BANNACK substation?
BANNACK has a maximum voltage of 69 kV and a minimum of 46 kV. That places it in the 69–114 kV band. The median named US substation in this dataset is 115 kV, so BANNACK is below the national midpoint.
How many transmission lines connect to BANNACK substation?
2 transmission lines terminate at or pass through BANNACK in the HIFLD line data. The connected lines listed here run at 69 kV, 46 kV. Together the listed lines cover about 40.2 miles.
Who owns BANNACK substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at BANNACK belong to IDAHO POWER CO, and others to VIGILANTE ELECTRIC COOP, INC. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is BANNACK substation located?
BANNACK is in Montana at 45.1775, -113.0164. The datacenter candidate sites closest to it are in Beaverhead County.
Are there datacenter candidate sites near BANNACK substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of BANNACK. The highest-scoring is UNKNOWN205102 at 58/100. Across Montana, the average DC Readiness score is 54.3.
Other 69 kV substations in Montana
- KERR· 6 lines
- APPLEWAY· 3 lines
- FORT BENTON· 3 lines
- LEWISTOWN NO. 1· 3 lines
- NINEPIPE· 3 lines
- REED POINT· 3 lines
- THOMPSON FALLS· 3 lines
- WHITEFISH· 3 lines
- All named substations in Montana· 149 stations
- Datacenter candidate sites in Montana· 2,542 sites
- Brownfield and retired plant sites in Montana
- 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, “BANNACK substation, Montana”, https://gridcensus.com/substations/montana/bannack-028eacae (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 BANNACK substation, Montana 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.