HARLEM
SubstationMontana · WAPA-- WESTERN AREA POWER ADMINISTRATION
HARLEM is an electric transmission substation in Montana, operated by WAPA-- WESTERN AREA POWER ADMINISTRATION. It is classified as high-voltage (230 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 & 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 |
|---|---|---|---|---|
| #68446 | 230 kV | WAPA-- WESTERN AREA POWER ADMINISTRATION | — | 48.6 mi |
| #68447 | 230 kV | WAPA-- WESTERN AREA POWER ADMINISTRATION | — | 51.5 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of HARLEM, 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 |
|---|---|---|---|---|---|---|---|
| HARLEM | Substation-Adjacent | MT | Blaine County | 230 kV | 300 MW | 1.1 yrs | 76.9 |
| Greenfield (MALTA - HARLEM) | Greenfield | MT | Blaine County | 230 kV | 300 MW | 1.1 yrs | 70.1 |
| Greenfield (HARLEM - HAVRE / ASSINNIBOINE) | Greenfield | MT | Blaine County | 230 kV | 300 MW | 1.1 yrs | 69.6 |
| Greenfield (HARLEM - HAVRE / ASSINNIBOINE) | Greenfield | MT | Blaine County | 230 kV | 300 MW | 1.1 yrs | 69.0 |
| Greenfield (HARLEM - HAVRE / ASSINNIBOINE) | Greenfield | MT | Blaine County | 230 kV | 300 MW | 1.1 yrs | 67.1 |
| Greenfield (MALTA - HARLEM) | Greenfield | MT | Blaine County | 230 kV | 300 MW | 1.1 yrs | 66.7 |
| Greenfield (MALTA - HARLEM) | Greenfield | MT | Blaine County | 230 kV | 300 MW | 1.1 yrs | 64.9 |
| OZ Blaine | Greenfield | MT | Blaine | — | — | 1.1 yrs | 64.3 |
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.
Go deeper than the public screen
This page shows a public slice of the GridCensus dataset for HARLEM 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.