TARKIO
SubstationMontana · NORTHWESTERN ENERGY LLC - (MT)
TARKIO is an electric transmission substation in Montana, operated by NORTHWESTERN ENERGY LLC - (MT). It is classified as sub-transmission (115 kv) and connects 1 transmission line. 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 & operation
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #69344 | 115 kV | NORTHWESTERN ENERGY LLC - (MT) | — | 11.3 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TARKIO, 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 |
|---|---|---|---|---|---|---|---|
| Greenfield (TAFT - GARRISON) | Greenfield | MT | Mineral County | 500 kV | 1,000 MW | 1.1 yrs | 71.5 |
| Greenfield (TAFT - GARRISON) | Greenfield | MT | Missoula County | 500 kV | 1,000 MW | 1.1 yrs | 71.3 |
| Greenfield (TAFT - GARRISON) | Greenfield | MT | Mineral County | 500 kV | 1,000 MW | 1.1 yrs | 68.9 |
| TAP207787 | Substation-Adjacent | MT | Mineral County | 115 kV | 100 MW | 1.1 yrs | 68.3 |
| Greenfield (TAFT - GARRISON) | Greenfield | MT | Mineral County | 500 kV | 1,000 MW | 1.1 yrs | 67.8 |
| Greenfield (TAFT - GARRISON) | Greenfield | MT | Mineral County | 500 kV | 1,000 MW | 1.1 yrs | 67.2 |
| Greenfield (TAFT - GARRISON) | Greenfield | MT | Mineral County | 500 kV | 1,000 MW | 1.1 yrs | 66.8 |
| Greenfield (TAFT - GARRISON) | Greenfield | MT | Mineral County | 500 kV | 1,000 MW | 1.1 yrs | 66.8 |
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
This page shows a public slice of the GridCensus dataset for TARKIO substation, Montana. Pro and Enterprise plans unlock the full 164,098-site catalog, raw sub-scores, parcel ownership, interconnection-queue detail, saved searches, and programmatic API access.