GRAND TOWER
SubstationIllinois · AMEREN ILLINOIS COMPANY
GRAND TOWER is an electric transmission substation in Illinois, operated by AMEREN ILLINOIS COMPANY. It is classified as sub-transmission (138 kv) and connects 6 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 |
|---|---|---|---|---|
| #25871 | 138 kV | AMEREN ILLINOIS COMPANY | IN SERVICE | 16.6 mi |
| #33253 | 138 kV | AMEREN ILLINOIS COMPANY | IN SERVICE | 16.9 mi |
| #34845 | 138 kV | AMEREN ILLINOIS COMPANY | IN SERVICE | 0.1 mi |
| #39467 | 138 kV | AMEREN ILLINOIS COMPANY | IN SERVICE | 22.0 mi |
| #41897 | 138 kV | AMEREN ILLINOIS COMPANY | IN SERVICE | 20.8 mi |
| #42351 | 138 kV | — | IN SERVICE | 23.6 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of GRAND TOWER, 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 |
|---|---|---|---|---|---|---|---|
| TAP153821 | Substation-Adjacent | MO | Bollinger County | 345 kV | 600 MW | 4.6 yrs | 69.4 |
| TAP139473 | Substation-Adjacent | IL | Franklin County | 230 kV | 300 MW | 4.6 yrs | 67.6 |
| UNKNOWN121880 | Substation-Adjacent | IL | Jackson County | 138 kV | 100 MW | 4.6 yrs | 66.6 |
| ST JOHNS | Substation-Adjacent | IL | Perry County | 230 kV | 300 MW | 4.6 yrs | 66.3 |
| TAP153686 | Substation-Adjacent | IL | Union County | 138 kV | 100 MW | 4.6 yrs | 66.0 |
| UNKNOWN122348 | Substation-Adjacent | IL | Randolph County | 161 kV | 100 MW | 4.6 yrs | 65.4 |
| UNKNOWN174145 | Substation-Adjacent | MO | Cape Girardeau County | 161 kV | 100 MW | 4.6 yrs | 65.3 |
| CARBONDALE NW | Substation-Adjacent | IL | Jackson County | 138 kV | 100 MW | 4.6 yrs | 64.8 |
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
This page shows a public slice of the GridCensus dataset for GRAND TOWER substation, Illinois. Pro and Enterprise plans unlock the full 164,098-site catalog, raw sub-scores, parcel ownership, interconnection-queue detail, saved searches, and programmatic API access.