MARKHAM
SubstationTexas · PUBLIC SERVICE CO OF OKLAHOMA
MARKHAM is an electric transmission substation in Texas, operated by PUBLIC SERVICE CO OF OKLAHOMA. 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 |
|---|---|---|---|---|
| #26657 | 161 kV | — | IN SERVICE | 5.7 mi |
| #46666 | 161 kV | PUBLIC SERVICE CO OF OKLAHOMA | IN SERVICE | 13.3 mi |
| #22638 | 161 kV | — | IN SERVICE | 26.5 mi |
| #5664 | 161 kV | — | IN SERVICE | 6.1 mi |
| #30558 | 161 kV | — | IN SERVICE | 6.1 mi |
| #32455 | 161 kV | — | IN SERVICE | 5.7 mi |
| #7352 | 115 kV | — | IN SERVICE | 5.8 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of MARKHAM, 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 |
|---|---|---|---|---|---|---|---|
| UNKNOWN118392 | Substation-Adjacent | OK | Mayes County | 345 kV | 600 MW | 3.4 yrs | 73.2 |
| CHOUTEAU | Substation-Adjacent | OK | Mayes County | 345 kV | 600 MW | 3.4 yrs | 71.5 |
| UNKNOWN118448 | Substation-Adjacent | OK | Cherokee County | 161 kV | 100 MW | 3.4 yrs | 69.6 |
| UNKNOWN119301 | Substation-Adjacent | OK | Wagoner County | 138 kV | 100 MW | 3.4 yrs | 69.6 |
| UNKNOWN119088 | Substation-Adjacent | OK | Wagoner County | 161 kV | 100 MW | 3.4 yrs | 69.6 |
| GREC | Brownfield | OK | Mayes County | 161 kV | 540 MW | 3.5 yrs | 69.5 |
| UNKNOWN119010 | Substation-Adjacent | OK | Wagoner County | 161 kV | 100 MW | 3.4 yrs | 69.5 |
| UNKNOWN133415 | Substation-Adjacent | OK | Delaware County | 345 kV | 600 MW | 3.4 yrs | 69.3 |
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 MARKHAM substation, Texas. 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.