HAVRE / ASSINNIBOINE
SubstationMontana · NORTHWESTERN ENERGY LLC - (MT)
HAVRE / ASSINNIBOINE is an electric transmission substation in Montana, operated by NORTHWESTERN ENERGY LLC - (MT). It is classified as high-voltage (230 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 & 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 |
|---|---|---|---|---|
| #68447 | 230 kV | WAPA-- WESTERN AREA POWER ADMINISTRATION | — | 51.5 mi |
| #69288 | 230 kV | NORTHWESTERN ENERGY LLC - (MT) | — | 93.8 mi |
| #69289 | 230 kV | WAPA-- WESTERN AREA POWER ADMINISTRATION | — | 30.1 mi |
| #69294 | 115 kV | WAPA-- WESTERN AREA POWER ADMINISTRATION | — | 32.9 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of HAVRE / ASSINNIBOINE, 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 |
|---|---|---|---|---|---|---|---|
| VERONA | Substation-Adjacent | MT | Chouteau County | 230 kV | 300 MW | 1.1 yrs | 75.8 |
| HAVRE / ASSINNIBOINE | Substation-Adjacent | MT | Hill County | 230 kV | 300 MW | 1.1 yrs | 72.8 |
| UNKNOWN208245 | Substation-Adjacent | MT | Hill County | 115 kV | 100 MW | 1.1 yrs | 69.6 |
| Greenfield (HAVRE / ASSINNIBOINE - VERONA) | Greenfield | MT | Chouteau County | 230 kV | 300 MW | 1.1 yrs | 69.1 |
| UNKNOWN208249 | Substation-Adjacent | MT | Hill County | 115 kV | 100 MW | 1.1 yrs | 68.3 |
| Greenfield (HARLEM - HAVRE / ASSINNIBOINE) | Greenfield | MT | Blaine County | 230 kV | 300 MW | 1.1 yrs | 67.3 |
| Greenfield (HARLEM - HAVRE / ASSINNIBOINE) | Greenfield | MT | Hill County | 230 kV | 300 MW | 1.1 yrs | 66.6 |
| Greenfield (HAVRE / ASSINNIBOINE - UNKNOWN) | Greenfield | MT | Hill County | 230 kV | 300 MW | 1.1 yrs | 66.3 |
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.
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This page shows a public slice of the GridCensus dataset for HAVRE / ASSINNIBOINE 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.