FLAT ROCK
SubstationAlabama
At a glance
FLAT ROCK is an electric transmission substation in Alabama. It is classified as sub-transmission (138 kv) and connects 1 transmission line. 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
No owner is recorded for the lines that connect here.
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #175049 | 161 kV | — | IN SERVICE | 2.1 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of FLAT ROCK, 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 |
|---|---|---|---|---|---|---|---|
| WIDOWS CREEK 500KV | Substation-Adjacent | AL | Dade County | 500 kV | 1,000 MW | 3.9 yrs | 73.0 |
| RACCOON MOUNTAIN | Substation-Adjacent | TN | Hamilton County | 500 kV | 1,000 MW | 3.9 yrs | 72.0 |
| BELLEFONTE | Substation-Adjacent | AL | Jackson County | 500 kV | 1,000 MW | 3.9 yrs | 68.3 |
| TAP152961 | Substation-Adjacent | AL | Jackson County | 500 kV | 1,000 MW | 3.9 yrs | 68.0 |
| TAP153404 | Substation-Adjacent | AL | Jackson County | 500 kV | 1,000 MW | 3.9 yrs | 67.6 |
| OZ Hamilton | Greenfield | TN | Hamilton | — | — | 3.9 yrs | 67.3 |
| OZ Hamilton | Greenfield | TN | Hamilton | — | — | 3.9 yrs | 67.1 |
| MOCCASIN | Substation-Adjacent | TN | Hamilton County | 161 kV | 100 MW | 3.9 yrs | 65.2 |
How does FLAT ROCK 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. 98 named substations in the state are in FLAT ROCK's 115–229 kV band (62% of named stations). 48 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.
How do candidate sites near FLAT ROCK score?
The 8 highest-scoring candidate sites within about 25 miles range from 65 to 73 on the 0–100 DC Readiness scale. They fall in Dade County, Hamilton County, Jackson County, Hamilton. 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 FLAT ROCK substation?
FLAT ROCK has a maximum voltage of 161 kV. That places it in the 115–229 kV band. The median named US substation in this dataset is 115 kV, so FLAT ROCK is above the national midpoint.
How many transmission lines connect to FLAT ROCK substation?
1 transmission line terminate at or pass through FLAT ROCK in the HIFLD line data. The connected lines listed here run at 161 kV. Together the listed lines cover about 2.1 miles.
Where is FLAT ROCK substation located?
FLAT ROCK is in Alabama at 34.7680, -85.7009. The datacenter candidate sites closest to it are in Dade County, Hamilton County, Jackson County.
Are there datacenter candidate sites near FLAT ROCK substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of FLAT ROCK. The highest-scoring is WIDOWS CREEK 500KV at 73/100. Across Alabama, the average DC Readiness score is 55.
Other 161 kV substations in Alabama
- CHEROKEE· 15 lines
- WILSON DAM· 10 lines
- GUNTERSVILLE DAM· 9 lines
- HUNTSVILLE· 9 lines
- DECATUR· 8 lines
- NORTHWEST PRIMARY· 8 lines
- ATHENS· 7 lines
- WHEELER DAM· 7 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, “FLAT ROCK substation, Alabama”, https://gridcensus.com/substations/alabama/flat-rock-53d0b910 (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 FLAT ROCK 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.