NORTHWEST PRIMARY
SubstationAlabama · TENNESSEE VALLEY AUTHORITY
NORTHWEST PRIMARY is an electric transmission substation in Alabama, operated by TENNESSEE VALLEY AUTHORITY. It is classified as sub-transmission (138 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
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #19131 | 161 kV | TENNESSEE VALLEY AUTHORITY | IN SERVICE | 2.0 mi |
| #27764 | 161 kV | TENNESSEE VALLEY AUTHORITY | IN SERVICE | 1.1 mi |
| #32512 | 161 kV | TENNESSEE VALLEY AUTHORITY | IN SERVICE | 16.0 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of NORTHWEST PRIMARY, 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 |
|---|---|---|---|---|---|---|---|
| MADISON | Substation-Adjacent | AL | Madison County | 500 kV | 1,000 MW | 3.7 yrs | 80.9 |
| LIMESTONE | Substation-Adjacent | AL | Limestone County | 500 kV | 1,000 MW | 3.7 yrs | 78.3 |
| UNKNOWN114484 | Substation-Adjacent | AL | Limestone County | 500 kV | 1,000 MW | 3.7 yrs | 75.8 |
| BROWNS FERRY | Substation-Adjacent | AL | Limestone County | 500 kV | 1,000 MW | 3.7 yrs | 75.7 |
| TAP155769 | Substation-Adjacent | AL | Madison County | 161 kV | 100 MW | 3.7 yrs | 73.6 |
| TAP153429 | Substation-Adjacent | AL | Madison County | 161 kV | 100 MW | 3.7 yrs | 73.2 |
| Greenfield (BROWNS FERRY - MADISON) | Greenfield | AL | Madison County | 500 kV | 1,000 MW | 3.7 yrs | 72.9 |
| Greenfield (BROWNS FERRY - MADISON) | Greenfield | AL | Madison County | 500 kV | 1,000 MW | 3.7 yrs | 72.6 |
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 NORTHWEST PRIMARY substation, Alabama. 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.