TAP139450
SubstationIllinois · UNION ELECTRIC CO - (MO)
TAP139450 is an electric transmission substation in Illinois, operated by UNION ELECTRIC CO - (MO). It is classified as sub-transmission (138 kv) and connects 7 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 |
|---|---|---|---|---|
| #5131 | 138 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 0.2 mi |
| #8701 | 138 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 2.2 mi |
| #8702 | 138 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 2.2 mi |
| #22454 | 138 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 0.2 mi |
| #23932 | 138 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 0.4 mi |
| #27749 | 138 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 0.4 mi |
| #27974 | 138 kV | — | IN SERVICE | 2.3 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TAP139450, 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 |
|---|---|---|---|---|---|---|---|
| TAP139481 | Substation-Adjacent | MO | St. Louis city | 345 kV | 600 MW | 4.6 yrs | 75.9 |
| UNKNOWN117735 | Substation-Adjacent | MO | St. Louis city | 345 kV | 600 MW | 4.6 yrs | 75.0 |
| MASON | Substation-Adjacent | MO | St. Louis County | 345 kV | 600 MW | 4.6 yrs | 74.6 |
| CAHOKIA | Substation-Adjacent | MO | St. Louis city | 345 kV | 600 MW | 4.6 yrs | 73.4 |
| STALLINGS | Substation-Adjacent | IL | Madison County | 345 kV | 600 MW | 4.6 yrs | 73.0 |
| JARVIS | Substation-Adjacent | IL | Madison County | 345 kV | 600 MW | 4.6 yrs | 72.7 |
| SIOUX | Substation-Adjacent | IL | Jersey County | 345 kV | 600 MW | 4.6 yrs | 72.6 |
| TURKEY HILL | Substation-Adjacent | IL | St. Clair County | 345 kV | 600 MW | 4.6 yrs | 71.9 |
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 TAP139450 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.