UNION POWER STATION
SubstationArkansas · ENTERGY ARKANSAS INC
UNION POWER STATION is an electric transmission substation in Arkansas, operated by ENTERGY ARKANSAS INC. It is classified as extra-high-voltage (500 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 |
|---|---|---|---|---|
| #18231 | 500 kV | ENTERGY ARKANSAS INC | IN SERVICE | 0.6 mi |
| #39176 | 500 kV | ENTERGY ARKANSAS INC | IN SERVICE | 0.6 mi |
| #47603 | 500 kV | ENTERGY ARKANSAS INC | — | 0.2 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of UNION POWER STATION, 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 |
|---|---|---|---|---|---|---|---|
| UNION POWER STATION | Substation-Adjacent | AR | Union County | 500 kV | 1,000 MW | 1.4 yrs | 70.9 |
| EL DORADO SUBSTATION | Substation-Adjacent | AR | Calhoun County | 500 kV | 1,000 MW | 1.4 yrs | 69.9 |
| Greenfield (EL DORADO SUBSTATION - SHERIDA) | Greenfield | AR | Calhoun County | 500 kV | 1,000 MW | 1.4 yrs | 66.4 |
| Greenfield (EL DORADO SUBSTATION - SHERIDA) | Greenfield | AR | Calhoun County | 500 kV | 1,000 MW | 1.4 yrs | 64.7 |
| UNKNOWN107723 | Substation-Adjacent | AR | Ouachita County | 115 kV | 100 MW | 1.4 yrs | 64.4 |
| Greenfield (MOUNT OLIVE - EL DORADO SUBSTA) | Greenfield | AR | Union County | 500 kV | 1,000 MW | 1.4 yrs | 64.3 |
| Greenfield (UNKNOWN107970 - EL DORADO SUBS) | Greenfield | AR | Union County | 500 kV | 1,000 MW | 1.4 yrs | 64.2 |
| Greenfield (UNKNOWN107970 - EL DORADO SUBS) | Greenfield | AR | Union County | 500 kV | 1,000 MW | 1.4 yrs | 63.9 |
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 UNION POWER STATION substation, Arkansas. 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.