TAP139490
SubstationIllinois · UNION ELECTRIC CO - (MO)
TAP139490 is an electric transmission substation in Illinois, operated by UNION ELECTRIC CO - (MO). It is classified as sub-transmission (138 kv) 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 |
|---|---|---|---|---|
| #13353 | 138 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 14.5 mi |
| #26927 | 138 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 10.4 mi |
| #28698 | 138 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 0.1 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of TAP139490, 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 |
|---|---|---|---|---|---|---|---|
| TAP139428 | Substation-Adjacent | MO | Jefferson County | 345 kV | 600 MW | 4.6 yrs | 69.8 |
| 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 |
| UNKNOWN117859 | Substation-Adjacent | MO | St. Francois County | 138 kV | 100 MW | 4.6 yrs | 65.1 |
| UNKNOWN121834 | Substation-Adjacent | MO | St. Francois County | 138 kV | 100 MW | 4.6 yrs | 64.5 |
| TAP139472 | Substation-Adjacent | MO | St. Francois County | 138 kV | 100 MW | 4.6 yrs | 64.3 |
| Greenfield (LUTESVILLE - ST FRANCOIS) | Greenfield | MO | St. Francois County | 345 kV | 600 MW | 4.6 yrs | 64.0 |
| UNKNOWN121748 | Substation-Adjacent | MO | Jefferson County | 138 kV | 100 MW | 4.6 yrs | 63.8 |
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 TAP139490 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.