MARIOSA DELTA
SubstationMissouri · UNION ELECTRIC CO - (MO)
MARIOSA DELTA is an electric transmission substation in Missouri, operated by UNION ELECTRIC CO - (MO). It is classified as high-voltage (345 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 |
|---|---|---|---|---|
| #27068 | 345 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 10.7 mi |
| #35700 | 161 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 14.4 mi |
| #48260 | 161 kV | UNION ELECTRIC CO - (MO) | IN SERVICE | 3.9 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of MARIOSA DELTA, 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 |
|---|---|---|---|---|---|---|---|
| CALLAWAY | Substation-Adjacent | MO | Callaway County | 345 kV | 600 MW | 1.4 yrs | 73.1 |
| UNKNOWN117843 | Substation-Adjacent | MO | Boone County | 161 kV | 100 MW | 1.4 yrs | 69.8 |
| TAP140561 | Substation-Adjacent | MO | Callaway County | 345 kV | 600 MW | 1.4 yrs | 69.4 |
| CALLAWAY | Substation-Adjacent | MO | Callaway County | 345 kV | 600 MW | 4.6 yrs | 68.3 |
| LOOSE CREEK | Substation-Adjacent | MO | Osage County | 345 kV | 600 MW | 1.4 yrs | 68.2 |
| TAP140552 | Substation-Adjacent | MO | Boone County | 161 kV | 100 MW | 1.4 yrs | 67.3 |
| UNKNOWN117848 | Substation-Adjacent | MO | Boone County | 161 kV | 100 MW | 1.4 yrs | 67.3 |
| UNKNOWN117725 | Substation-Adjacent | MO | Boone County | 161 kV | 100 MW | 1.4 yrs | 66.7 |
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 MARIOSA DELTA 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.