TAP168857
SubstationIllinois · AMEREN ILLINOIS COMPANY
At a glance
TAP168857 is an electric transmission substation in Illinois, on AMEREN ILLINOIS COMPANY's transmission network. 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
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #170356 | 69 kV | AMEREN ILLINOIS COMPANY | IN SERVICE | 10.6 mi |
| #170357 | 69 kV | AMEREN ILLINOIS COMPANY | IN SERVICE | 2.7 mi |
| #170358 | 69 kV | AMEREN ILLINOIS COMPANY | IN SERVICE | 5.5 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TAP168857, 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 |
|---|---|---|---|---|---|---|---|
| EC Coal Williamson County | Greenfield | IL | Williamson County | — | — | 4.8 yrs | 59.9 |
| PINCKNEYVILLE STATION | Substation-Adjacent | IL | Perry County | 230 kV | 300 MW | 4.8 yrs | 59.9 |
| UNKNOWN121881 | Substation-Adjacent | IL | Jackson County | 138 kV | 100 MW | 4.8 yrs | 59.7 |
| EC Coal Williamson County | Greenfield | IL | Williamson County | — | — | 4.8 yrs | 59.5 |
| UNKNOWN121872 | Substation-Adjacent | IL | Williamson County | 161 kV | 100 MW | 4.8 yrs | 59.3 |
| OZ Williamson | Greenfield | IL | Williamson | — | — | 4.8 yrs | 59.1 |
| UNKNOWN122131 | Substation-Adjacent | IL | Perry County | 230 kV | 300 MW | 4.8 yrs | 59.1 |
| EC Coal Williamson County | Greenfield | IL | Williamson County | — | — | 4.8 yrs | 58.9 |
Who owns the transmission lines at TAP168857?
The 3 connected lines listed above are owned by AMEREN ILLINOIS COMPANY. Line voltages range from 69 kV to 69 kV. Their combined recorded length is about 18.8 miles.
How do candidate sites near TAP168857 score?
The 8 highest-scoring candidate sites within about 25 miles range from 59 to 60 on the 0–100 DC Readiness scale. They fall in Williamson County, Perry County, Jackson County, Williamson. The Illinois average across 3,641 scored sites is 54.3. 795 of those Illinois sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
How many transmission lines connect to TAP168857 substation?
3 transmission lines terminate at or pass through TAP168857 in the HIFLD line data. The connected lines listed here run at 69 kV. Together the listed lines cover about 18.8 miles.
Who owns TAP168857 substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at TAP168857 belong to AMEREN ILLINOIS COMPANY. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is TAP168857 substation located?
TAP168857 is in Illinois at 37.7354, -89.3441. The datacenter candidate sites closest to it are in Williamson County, Perry County, Jackson County.
Are there datacenter candidate sites near TAP168857 substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of TAP168857. The highest-scoring is EC Coal Williamson County at 60/100. Across Illinois, the average DC Readiness score is 54.3.
More in Illinois
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, “TAP168857 substation, Illinois”, https://gridcensus.com/substations/illinois/tap168857-61015283 (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 TAP168857 substation, Illinois 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.