ST FRANCOIS
SubstationIllinois · UNION ELECTRIC CO - (MO)
ST FRANCOIS is an electric transmission substation in Illinois, operated by UNION ELECTRIC CO - (MO). It is classified as high-voltage (345 kv) and connects 10 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 |
|---|---|---|---|---|
| #26653 | 345 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 17.0 mi |
| #43889 | 345 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 17.0 mi |
| #39300 | 345 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 62.9 mi |
| #30248 | 138 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 8.1 mi |
| #38492 | 138 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 10.8 mi |
| #41864 | 138 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 7.1 mi |
| #2343 | 138 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 18.6 mi |
| #49453 | 138 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 16.7 mi |
| #3396 | 138 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 9.3 mi |
| #22986 | 138 kV | — | IN SERVICE | 24.5 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of ST FRANCOIS, 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 |
|---|---|---|---|---|---|---|---|
| UNKNOWN121749 | Substation-Adjacent | IL | Monroe County | 345 kV | 600 MW | 4.6 yrs | 73.0 |
| TAP139428 | Substation-Adjacent | MO | Jefferson County | 345 kV | 600 MW | 4.6 yrs | 69.8 |
| TAP160053 | Substation-Adjacent | IL | Monroe County | 345 kV | 600 MW | 4.6 yrs | 69.2 |
| TAP139427 | Substation-Adjacent | MO | Jefferson County | 345 kV | 600 MW | 4.6 yrs | 67.1 |
| ST FRANCOIS | Substation-Adjacent | MO | St. Francois County | 345 kV | 600 MW | 4.6 yrs | 66.4 |
| TAP139434 | Substation-Adjacent | MO | Jefferson County | 138 kV | 100 MW | 4.6 yrs | 66.2 |
| TAP139491 | Substation-Adjacent | IL | Monroe County | 138 kV | 100 MW | 4.6 yrs | 65.7 |
| UNKNOWN117859 | Substation-Adjacent | MO | St. Francois County | 138 kV | 100 MW | 4.6 yrs | 65.1 |
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 ST FRANCOIS 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.