SOUTH MONTGOMERY
SubstationAlabama · ALABAMA POWER CO
At a glance
SOUTH MONTGOMERY is an electric transmission substation in Alabama, on ALABAMA POWER CO's transmission network. 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
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #125140 | 230 kV | ALABAMA POWER CO | IN SERVICE | 7.7 mi |
| #141200 | 230 kV | ALABAMA POWER CO | IN SERVICE | 7.6 mi |
| #122956 | 115 kV | ALABAMA POWER CO | IN SERVICE | 1.9 mi |
| #105938 | 115 kV | ALABAMA POWER CO | IN SERVICE | 3.8 mi |
| #133059 | 115 kV | ALABAMA POWER CO | IN SERVICE | 4.5 mi |
| #165521 | 115 kV | ALABAMA POWER CO | IN SERVICE | 7.8 mi |
| #116560 | 115 kV | ALABAMA POWER CO | IN SERVICE | 4.1 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of SOUTH MONTGOMERY, 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 |
|---|---|---|---|---|---|---|---|
| AUTAUGAVILLE | Substation-Adjacent | AL | Autauga County | 500 kV | 1,000 MW | 3.9 yrs | 71.9 |
| SNOWDOUN | Substation-Adjacent | AL | Montgomery County | 500 kV | 1,000 MW | 3.9 yrs | 69.6 |
| WEST MONTGOMERY | Substation-Adjacent | AL | Montgomery County | 230 kV | 300 MW | 3.9 yrs | 67.2 |
| SOUTH MONTGOMERY | Substation-Adjacent | AL | Montgomery County | 230 kV | 300 MW | 3.9 yrs | 66.2 |
| MONTGOMERY SWITCHING STATION | Substation-Adjacent | AL | Montgomery County | 230 kV | 300 MW | 3.9 yrs | 66.2 |
| TAP146014 | Substation-Adjacent | AL | Montgomery County | 230 kV | 300 MW | 3.9 yrs | 66.1 |
| MADISON PARK | Substation-Adjacent | AL | Elmore County | 230 kV | 300 MW | 3.9 yrs | 66.0 |
| UNKNOWN109716 | Substation-Adjacent | AL | Montgomery County | 230 kV | 300 MW | 3.9 yrs | 65.9 |
How does SOUTH MONTGOMERY compare with other substations in Alabama?
Alabama has 2,790 substation records in HIFLD, of which 158 carry a station name; the rest are unnamed tap points, risers and line ends. 33 named substations in the state are in SOUTH MONTGOMERY's 230–344 kV band (21% of named stations). 15 sit in a higher band. 15 named substations in Alabama operate at 345 kV or above. The highest voltage recorded in the state is 500 kV, and the state median is 161 kV.
Who owns the transmission lines at SOUTH MONTGOMERY?
The 7 connected lines listed above are owned by ALABAMA POWER CO. Line voltages range from 115 kV to 230 kV. Their combined recorded length is about 37.4 miles.
How do candidate sites near SOUTH MONTGOMERY score?
The 8 highest-scoring candidate sites within about 25 miles range from 66 to 72 on the 0–100 DC Readiness scale. They fall in Autauga County, Montgomery County, Elmore County. The Alabama average across 3,107 scored sites is 55. 1,164 of those Alabama sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is SOUTH MONTGOMERY substation?
SOUTH MONTGOMERY has a maximum voltage of 230 kV and a minimum of 115 kV. That places it in the 230–344 kV band. The median named US substation in this dataset is 115 kV, so SOUTH MONTGOMERY is above the national midpoint.
How many transmission lines connect to SOUTH MONTGOMERY substation?
7 transmission lines terminate at or pass through SOUTH MONTGOMERY in the HIFLD line data. The connected lines listed here run at 230 kV, 115 kV. Together the listed lines cover about 37.4 miles.
Who owns SOUTH MONTGOMERY substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at SOUTH MONTGOMERY belong to ALABAMA POWER CO. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is SOUTH MONTGOMERY substation located?
SOUTH MONTGOMERY is in Alabama at 32.3257, -86.2927. The datacenter candidate sites closest to it are in Autauga County, Montgomery County, Elmore County.
Are there datacenter candidate sites near SOUTH MONTGOMERY substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of SOUTH MONTGOMERY. The highest-scoring is AUTAUGAVILLE at 72/100. Across Alabama, the average DC Readiness score is 55.
Other 230 kV substations in Alabama
- LEEDS· 15 lines
- PINCKARD· 12 lines
- PLANT GASTON· 12 lines
- GREENE COUNTY STATION· 11 lines
- NORTH MOBILE· 11 lines
- HOLT T.S.· 10 lines
- MAGELLA· 10 lines
- OPP· 10 lines
- All named substations in Alabama· 158 stations
- Datacenter candidate sites in Alabama· 3,107 sites
- Brownfield and retired plant sites in Alabama
- Substations by state
About this data
Source: HIFLD Electric Substations and Transmission Lines (U.S. Department of Homeland Security), as published June 29, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: GridCensus, “SOUTH MONTGOMERY substation, Alabama”, https://gridcensus.com/substations/alabama/south-montgomery-28e91836 (data as of June 29, 2026).
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
Every site and score for SOUTH MONTGOMERY substation, Alabama is free to browse. Pro adds Watchtower on 25 sites, alerts when new candidate sites, datacenters or interconnection-queue requests appear in your markets, score and capacity history, and CSV export. Enterprise adds team seats, weekly data files for all 147,272 sites, the REST API and an MCP server for AI tools.