MARIES
SubstationMissouri · UNION ELECTRIC CO - (MO)
MARIES is an electric transmission substation in Missouri, operated by UNION ELECTRIC CO - (MO). It is classified as sub-transmission (138 kv) and connects 4 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 |
|---|---|---|---|---|
| #21671 | 161 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 0.3 mi |
| #23127 | 161 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 6.4 mi |
| #24117 | 161 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 5.9 mi |
| #36539 | 161 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 11.7 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of MARIES, 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 |
|---|---|---|---|---|---|---|---|
| FRANKS | Substation-Adjacent | MO | Pulaski County | 345 kV | 600 MW | 1.4 yrs | 70.6 |
| UNKNOWN117771 | Substation-Adjacent | MO | Pulaski County | 161 kV | 100 MW | 1.4 yrs | 65.7 |
| UNKNOWN117731 | Substation-Adjacent | MO | Gasconade County | 161 kV | 100 MW | 1.4 yrs | 65.2 |
| TAP138938 | Substation-Adjacent | MO | Phelps County | 138 kV | 100 MW | 4.6 yrs | 65.2 |
| Greenfield (FRANKS - TAP153680) | Greenfield | MO | Phelps County | 345 kV | 600 MW | 1.4 yrs | 64.6 |
| UNKNOWN117083 | Substation-Adjacent | MO | Cole County | 138 kV | 100 MW | 1.4 yrs | 64.3 |
| Greenfield (FRANKS - HUBEN) | Greenfield | MO | Pulaski County | 345 kV | 600 MW | 1.4 yrs | 64.1 |
| UNKNOWN117817 | Substation-Adjacent | MO | Pulaski County | 161 kV | 100 MW | 1.4 yrs | 64.1 |
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 MARIES substation, Missouri. 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.