TAP170621
SubstationTennessee
At a glance
TAP170621 is an electric transmission substation in Tennessee. It is classified as unclassified 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 |
|---|---|---|---|---|
| #172503 | — | — | IN SERVICE | 5.7 mi |
| #172504 | — | — | IN SERVICE | 3.4 mi |
| #177995 | — | — | IN SERVICE | 2.1 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TAP170621, 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 |
|---|---|---|---|---|---|---|---|
| RACCOON MOUNTAIN | Substation-Adjacent | TN | Hamilton County | 500 kV | 1,000 MW | 3.9 yrs | 72.0 |
| UNKNOWN115420 | Substation-Adjacent | TN | Hamilton County | 500 kV | 1,000 MW | 3.9 yrs | 69.9 |
| TAP155407 | Substation-Adjacent | TN | Bradley County | 500 kV | 1,000 MW | 3.9 yrs | 69.6 |
| OZ Hamilton | Greenfield | TN | Hamilton | — | — | 3.9 yrs | 67.8 |
| OZ Hamilton | Greenfield | TN | Hamilton | — | — | 3.9 yrs | 67.3 |
| OZ Hamilton | Greenfield | TN | Hamilton | — | — | 3.9 yrs | 67.1 |
| Volkswagen Chattanooga | Brownfield | TN | Hamilton | 161 kV | 10 MW | 3.9 yrs | 67.0 |
| CONCORD | Substation-Adjacent | TN | Catoosa County | 230 kV | 300 MW | 3.9 yrs | 65.6 |
How do candidate sites near TAP170621 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 Hamilton County, Bradley County, Hamilton, Catoosa County. 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
How many transmission lines connect to TAP170621 substation?
3 transmission lines terminate at or pass through TAP170621 in the HIFLD line data. Together the listed lines cover about 11.2 miles.
Where is TAP170621 substation located?
TAP170621 is in Tennessee at 35.1456, -85.2827. The datacenter candidate sites closest to it are in Hamilton County, Bradley County, Hamilton.
Are there datacenter candidate sites near TAP170621 substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of TAP170621. The highest-scoring is RACCOON MOUNTAIN at 72/100. Across Tennessee, the average DC Readiness score is 57.
More in Tennessee
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, “TAP170621 substation, Tennessee”, https://gridcensus.com/substations/tennessee/tap170621-b3ac7078 (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 TAP170621 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.