NEW UNDERWOOD
SubstationSouth Dakota · WAPA-- WESTERN AREA POWER ADMINISTRATION
NEW UNDERWOOD is an electric transmission substation in South Dakota, operated by WAPA-- WESTERN AREA POWER ADMINISTRATION. It is classified as high-voltage (230 kv) and connects 7 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 |
|---|---|---|---|---|
| #61557 | 230 kV | — | IN SERVICE | 18.6 mi |
| #69274 | 230 kV | WAPA-- WESTERN AREA POWER ADMINISTRATION | — | 80.2 mi |
| #69275 | 230 kV | WAPA-- WESTERN AREA POWER ADMINISTRATION | — | 60.6 mi |
| #69276 | 230 kV | WAPA-- WESTERN AREA POWER ADMINISTRATION | — | 72.2 mi |
| #12726 | 115 kV | — | IN SERVICE | 13.9 mi |
| #12728 | 115 kV | — | IN SERVICE | 15.8 mi |
| #12697 | 115 kV | — | IN SERVICE | 12.4 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of NEW UNDERWOOD, 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 |
|---|---|---|---|---|---|---|---|
| LANGE | Substation-Adjacent | SD | Pennington County | 230 kV | 300 MW | 1.0 yrs | 75.8 |
| RAPID CITY DC TIE | Substation-Adjacent | SD | Pennington County | 230 kV | 300 MW | 1.0 yrs | 71.9 |
| SOUTH RAPID CITY | Substation-Adjacent | SD | Pennington County | 230 kV | 300 MW | 1.0 yrs | 70.8 |
| UNKNOWN131182 | Substation-Adjacent | SD | Pennington County | 115 kV | 100 MW | 1.0 yrs | 70.4 |
| NEW UNDERWOOD | Substation-Adjacent | SD | Pennington County | 230 kV | 300 MW | 1.0 yrs | 69.9 |
| Greenfield (UNKNOWN202528 - SOUTH RAPID CI) | Greenfield | SD | Custer County | 230 kV | 300 MW | 1.0 yrs | 69.5 |
| UNKNOWN131179 | Substation-Adjacent | SD | Pennington County | 115 kV | 100 MW | 1.0 yrs | 69.5 |
| EC Near Ben French | Greenfield | SD | Pennington | — | — | 1.0 yrs | 68.2 |
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 NEW UNDERWOOD 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.