TAP156110
SubstationIllinois · AMEREN ILLINOIS COMPANY
At a glance
TAP156110 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 |
|---|---|---|---|---|
| #156654 | — | AMEREN ILLINOIS COMPANY | IN SERVICE | 1.2 mi |
| #156655 | — | AMEREN ILLINOIS COMPANY | IN SERVICE | 0.0 mi |
| #156656 | — | AMEREN ILLINOIS COMPANY | IN SERVICE | 6.4 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TAP156110, 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 |
|---|---|---|---|---|---|---|---|
| UNKNOWN117735 | Substation-Adjacent | MO | St. Louis city | 345 kV | 600 MW | 4.3 yrs | 67.0 |
| TAP139481 | Substation-Adjacent | IL | St. Louis city | 345 kV | 600 MW | 4.8 yrs | 66.6 |
| STALLINGS | Substation-Adjacent | IL | Madison County | 345 kV | 600 MW | 4.8 yrs | 66.5 |
| ROXFORD | Substation-Adjacent | IL | Madison County | 345 kV | 600 MW | 4.8 yrs | 65.1 |
| SIOUX | Substation-Adjacent | MO | Jersey County | 345 kV | 600 MW | 4.3 yrs | 64.9 |
| UNKNOWN122139 | Substation-Adjacent | IL | Madison County | 138 kV | 100 MW | 4.8 yrs | 63.3 |
| OZ St. Louis | Greenfield | MO | St. Louis | — | — | 4.3 yrs | 63.1 |
| EC Near Stallings | Greenfield | IL | Madison | — | — | 4.8 yrs | 62.6 |
Who owns the transmission lines at TAP156110?
The 3 connected lines listed above are owned by AMEREN ILLINOIS COMPANY. Their combined recorded length is about 7.6 miles.
How do candidate sites near TAP156110 score?
The 8 highest-scoring candidate sites within about 25 miles range from 63 to 67 on the 0–100 DC Readiness scale. They fall in St. Louis city, Madison County, Jersey County, St. Louis. 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 TAP156110 substation?
3 transmission lines terminate at or pass through TAP156110 in the HIFLD line data. Together the listed lines cover about 7.6 miles.
Who owns TAP156110 substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at TAP156110 belong to AMEREN ILLINOIS COMPANY. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is TAP156110 substation located?
TAP156110 is in Illinois at 39.0713, -89.9231. The datacenter candidate sites closest to it are in St. Louis city, Madison County, Jersey County.
Are there datacenter candidate sites near TAP156110 substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of TAP156110. The highest-scoring is UNKNOWN117735 at 67/100. 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, “TAP156110 substation, Illinois”, https://gridcensus.com/substations/illinois/tap156110-1c99f690 (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 TAP156110 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.