TAP205580
SubstationMontana · BIG HORN COUNTY ELECTRIC COOP, INC
At a glance
TAP205580 is an electric transmission substation in Montana, on BIG HORN COUNTY ELECTRIC COOP, INC's transmission network. It is classified as sub-transmission (115 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
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 |
|---|---|---|---|---|
| #204507 | 115 kV | BIG HORN COUNTY ELECTRIC COOP, INC | — | 12.5 mi |
| #204508 | 115 kV | BIG HORN COUNTY ELECTRIC COOP, INC | — | 4.1 mi |
| #204509 | 115 kV | BIG HORN COUNTY ELECTRIC COOP, INC | — | 8.8 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TAP205580, 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 |
|---|---|---|---|---|---|---|---|
| HARDEN | Substation-Adjacent | MT | Big Horn County | 230 kV | 300 MW | 1.1 yrs | 63.4 |
| CROSSOVER | Substation-Adjacent | MT | Big Horn County | 230 kV | 300 MW | 1.1 yrs | 63.2 |
| OZ Big Horn | Greenfield | MT | Big Horn | — | — | 1.1 yrs | 60.9 |
| EC Coal Big Horn County | Greenfield | MT | Big Horn County | — | — | 1.1 yrs | 60.8 |
| EC Coal Big Horn County | Greenfield | MT | Big Horn County | — | — | 1.1 yrs | 60.2 |
| UNKNOWN202457 | Substation-Adjacent | MT | Big Horn County | 230 kV | 300 MW | 1.1 yrs | 59.3 |
| UNKNOWN201491 | Substation-Adjacent | MT | Big Horn County | 230 kV | 300 MW | 1.1 yrs | 59.3 |
| TAP205581 | Substation-Adjacent | MT | Big Horn County | 115 kV | 100 MW | 1.1 yrs | 59.0 |
Who owns the transmission lines at TAP205580?
The 3 connected lines listed above are owned by BIG HORN COUNTY ELECTRIC COOP, INC. Line voltages range from 115 kV to 115 kV. Their combined recorded length is about 25.4 miles.
How do candidate sites near TAP205580 score?
The 8 highest-scoring candidate sites within about 25 miles range from 59 to 63 on the 0–100 DC Readiness scale. They fall in Big Horn County, Big Horn. 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 TAP205580 substation?
TAP205580 has a maximum voltage of 115 kV. That places it in the 115–229 kV band. The median named US substation in this dataset is 115 kV, so TAP205580 is at the national midpoint.
How many transmission lines connect to TAP205580 substation?
3 transmission lines terminate at or pass through TAP205580 in the HIFLD line data. The connected lines listed here run at 115 kV. Together the listed lines cover about 25.4 miles.
Who owns TAP205580 substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at TAP205580 belong to BIG HORN COUNTY ELECTRIC COOP, INC. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is TAP205580 substation located?
TAP205580 is in Montana at 45.6075, -107.5563. The datacenter candidate sites closest to it are in Big Horn County, Big Horn.
Are there datacenter candidate sites near TAP205580 substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of TAP205580. The highest-scoring is HARDEN at 63/100. Across Montana, the average DC Readiness score is 54.3.
More in Montana
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, “TAP205580 substation, Montana”, https://gridcensus.com/substations/montana/tap205580-18a42082 (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 TAP205580 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.