TAP205571
SubstationMontana · TONGUE RIVER ELECTRIC COOP INC
At a glance
TAP205571 is an electric transmission substation in Montana, on TONGUE RIVER ELECTRIC COOP INC's transmission network. It is classified as sub-transmission (115 kv) and connects 4 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 |
|---|---|---|---|---|
| #204487 | 115 kV | TONGUE RIVER ELECTRIC COOP INC | — | 3.5 mi |
| #204488 | 115 kV | TONGUE RIVER ELECTRIC COOP INC | — | 21.2 mi |
| #204491 | 115 kV | TONGUE RIVER ELECTRIC COOP INC | — | 14.9 mi |
| #210205 | 69 kV | TONGUE RIVER ELECTRIC COOP INC | — | 17.0 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TAP205571, 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 |
|---|---|---|---|---|---|---|---|
| COLSTRIP | Substation-Adjacent | MT | Rosebud County | 500 kV | 1,000 MW | 1.1 yrs | 75.8 |
| EC Coal Rosebud County | Greenfield | MT | Rosebud County | — | — | 1.1 yrs | 65.7 |
| EC Near Colstrip | Greenfield | MT | Rosebud | — | — | 1.1 yrs | 65.7 |
| EC Near Colstrip | Greenfield | MT | Rosebud | — | — | 1.1 yrs | 64.9 |
| EC Near Colstrip | Greenfield | MT | Rosebud | — | — | 1.1 yrs | 64.9 |
| EC Near Colstrip | Greenfield | MT | Rosebud | — | — | 1.1 yrs | 64.6 |
| EC Near Colstrip | Greenfield | MT | Rosebud | — | — | 1.1 yrs | 64.4 |
| EC Near Colstrip | Greenfield | MT | Rosebud | — | — | 1.1 yrs | 64.4 |
Who owns the transmission lines at TAP205571?
The 4 connected lines listed above are owned by TONGUE RIVER ELECTRIC COOP INC. Line voltages range from 69 kV to 115 kV. Their combined recorded length is about 56.6 miles.
How do candidate sites near TAP205571 score?
The 8 highest-scoring candidate sites within about 25 miles range from 64 to 76 on the 0–100 DC Readiness scale. They fall in Rosebud County, Rosebud. 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 TAP205571 substation?
TAP205571 has a maximum voltage of 115 kV and a minimum of 69 kV. That places it in the 115–229 kV band. The median named US substation in this dataset is 115 kV, so TAP205571 is at the national midpoint.
How many transmission lines connect to TAP205571 substation?
4 transmission lines terminate at or pass through TAP205571 in the HIFLD line data. The connected lines listed here run at 115 kV, 69 kV. Together the listed lines cover about 56.6 miles.
Who owns TAP205571 substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at TAP205571 belong to TONGUE RIVER ELECTRIC COOP INC. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is TAP205571 substation located?
TAP205571 is in Montana at 45.6688, -106.6915. The datacenter candidate sites closest to it are in Rosebud County, Rosebud.
Are there datacenter candidate sites near TAP205571 substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of TAP205571. The highest-scoring is COLSTRIP at 76/100. 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, “TAP205571 substation, Montana”, https://gridcensus.com/substations/montana/tap205571-0181dfa6 (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 TAP205571 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.