SIOUX
SubstationIllinois · UNION ELECTRIC CO - (MO)
SIOUX is an electric transmission substation in Illinois, operated by UNION ELECTRIC CO - (MO). It is classified as high-voltage (345 kv) and connects 16 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 |
|---|---|---|---|---|
| #50160 | 345 kV | — | IN SERVICE | 12.8 mi |
| #26489 | 345 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 22.1 mi |
| #6415 | 345 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 23.4 mi |
| #26152 | 138 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 9.1 mi |
| #26739 | 138 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 0.4 mi |
| #28445 | 138 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 7.3 mi |
| #29297 | 138 kV | UNION ELECTRIC CO - (MO) | — | 0.1 mi |
| #31007 | 138 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 13.6 mi |
| #33553 | 138 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 7.3 mi |
| #34243 | 138 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 0.4 mi |
| #35629 | 138 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 9.1 mi |
| #50618 | 138 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 24.1 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of SIOUX, 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 |
| SIOUX | Substation-Adjacent | IL | Jersey County | 345 kV | 600 MW | 4.6 yrs | 72.6 |
| ROXFORD | Substation-Adjacent | IL | Madison County | 345 kV | 600 MW | 4.6 yrs | 71.6 |
| O'FALLON RENEWABLE ENERGY CENTER | Substation-Adjacent | MO | St. Charles County | 345 kV | 600 MW | 4.6 yrs | 71.3 |
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 SIOUX 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.