NORTH UNION CITY
SubstationTennessee
At a glance
NORTH UNION CITY is an electric transmission substation in Tennessee. 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
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 |
|---|---|---|---|---|
| #163735 | 161 kV | — | IN SERVICE | 0.1 mi |
| #162829 | 69 kV | — | IN SERVICE | 7.6 mi |
| #163746 | 69 kV | — | IN SERVICE | 1.3 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of NORTH UNION CITY, 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 |
|---|---|---|---|---|---|---|---|
| WEAKLEY | Substation-Adjacent | TN | Weakley County | 500 kV | 1,000 MW | 3.9 yrs | 68.4 |
| EC FFE Carlisle County | Greenfield | KY | Carlisle County | — | — | 3.9 yrs | 61.9 |
| OZ Graves | Greenfield | KY | Graves | — | — | 3.9 yrs | 61.6 |
| OZ Carlisle | Greenfield | KY | Carlisle | — | — | 3.9 yrs | 60.9 |
| MARTIN | Substation-Adjacent | TN | Weakley County | 161 kV | 100 MW | 3.9 yrs | 60.3 |
| TAP152134 | Substation-Adjacent | TN | Weakley County | 161 kV | 100 MW | 3.9 yrs | 60.3 |
| TAP170525 | Substation-Adjacent | TN | Weakley County | 161 kV | 100 MW | 3.9 yrs | 60.3 |
| CLINTON | Substation-Adjacent | KY | Hickman County | 161 kV | 100 MW | 3.9 yrs | 60.3 |
How does NORTH UNION CITY compare with other substations in Tennessee?
Tennessee has 1,967 substation records in HIFLD, of which 517 carry a station name; the rest are unnamed tap points, risers and line ends. 376 named substations in the state are in NORTH UNION CITY's 115–229 kV band (73% of named stations). 26 sit in a higher band. 25 named substations in Tennessee 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 NORTH UNION CITY score?
The 8 highest-scoring candidate sites within about 25 miles range from 60 to 68 on the 0–100 DC Readiness scale. They fall in Weakley County, Carlisle County, Graves, Carlisle. The Tennessee average across 2,190 scored sites is 57. 886 of those Tennessee sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is NORTH UNION CITY substation?
NORTH UNION CITY has a maximum voltage of 161 kV and a minimum of 69 kV. That places it in the 115–229 kV band. The median named US substation in this dataset is 115 kV, so NORTH UNION CITY is above the national midpoint.
How many transmission lines connect to NORTH UNION CITY substation?
3 transmission lines terminate at or pass through NORTH UNION CITY in the HIFLD line data. The connected lines listed here run at 161 kV, 69 kV. Together the listed lines cover about 8.9 miles.
Where is NORTH UNION CITY substation located?
NORTH UNION CITY is in Tennessee at 36.4666, -89.0535. The datacenter candidate sites closest to it are in Weakley County, Carlisle County, Graves.
Are there datacenter candidate sites near NORTH UNION CITY substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of NORTH UNION CITY. The highest-scoring is WEAKLEY at 68/100. Across Tennessee, the average DC Readiness score is 57.
Other 161 kV substations in Tennessee
- JOHN SEVIER· 18 lines
- NORTHEAST GATE· 16 lines
- SOUTHEAST GATE· 16 lines
- ALLEN· 15 lines
- NORTH NASHVILLE· 13 lines
- WEST NASHVILLE· 13 lines
- ALCOA SW STATION· 12 lines
- FORT LOUDON DAM· 12 lines
- All named substations in Tennessee· 517 stations
- Datacenter candidate sites in Tennessee· 2,190 sites
- Brownfield and retired plant sites in Tennessee
- 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, “NORTH UNION CITY substation, Tennessee”, https://gridcensus.com/substations/tennessee/north-union-city-f639e890 (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 NORTH UNION CITY substation, Tennessee 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.