TAP138551
SubstationSouth Dakota · NORTHWESTERN ENERGY - (SD)
TAP138551 is an electric transmission substation in South Dakota, operated by NORTHWESTERN ENERGY - (SD). 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 & 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 |
|---|---|---|---|---|
| #36091 | 115 kV | NORTHWESTERN ENERGY - (SD) | IN SERVICE | 2.2 mi |
| #42996 | 115 kV | NORTHWESTERN ENERGY - (SD) | IN SERVICE | 3.6 mi |
| #46908 | 115 kV | NORTHWESTERN ENERGY - (SD) | IN SERVICE | 4.2 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TAP138551, 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 |
|---|---|---|---|---|---|---|---|
| UNKNOWN131194 | Substation-Adjacent | SD | Hughes County | 115 kV | 100 MW | 1.0 yrs | 63.4 |
| Greenfield (OAHE - SULLY BUTTES) | Greenfield | SD | Sully County | 230 kV | 300 MW | 1.0 yrs | 62.7 |
| FT. PIERRE | Substation-Adjacent | SD | Stanley County | 115 kV | 100 MW | 1.0 yrs | 62.6 |
| TAP138551 | Substation-Adjacent | SD | Stanley County | 115 kV | 100 MW | 1.0 yrs | 62.4 |
| Greenfield (FORT THOMPSON - OAHE) | Greenfield | SD | Hughes County | 230 kV | 300 MW | 1.0 yrs | 62.4 |
| Greenfield (WHITLOCK - SULLY BUTTES) | Greenfield | SD | Sully County | 230 kV | 300 MW | 1.0 yrs | 62.0 |
| Greenfield (FORT THOMPSON - OAHE) | Greenfield | SD | Stanley County | 230 kV | 300 MW | 1.0 yrs | 61.9 |
| Greenfield (OAHE - UNKNOWN204132) | Greenfield | SD | Stanley County | 230 kV | 300 MW | 1.0 yrs | 61.8 |
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 TAP138551 substation, South Dakota. 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.