RIO GRANDE CITY
SubstationTexas · AEP TEXAS CENTRAL COMPANY
At a glance
RIO GRANDE CITY is an electric transmission substation in Texas, on AEP TEXAS CENTRAL COMPANY's transmission network. It is classified as distribution (69–115 kv) and connects 1 transmission line. 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 |
|---|---|---|---|---|
| #309440 | 69 kV | AEP TEXAS CENTRAL COMPANY | — | 0.1 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of RIO GRANDE CITY, 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 |
|---|---|---|---|---|---|---|---|
| OZ Hidalgo | Greenfield | TX | Hidalgo | — | — | 3.5 yrs | 66.4 |
| OZ Hidalgo | Greenfield | TX | Hidalgo | — | — | 3.5 yrs | 65.9 |
| LOS MIRASOLES | Substation-Adjacent | TX | Starr County | 345 kV | 600 MW | 3.5 yrs | 65.1 |
| POMELO | Substation-Adjacent | TX | Hidalgo County | 345 kV | 600 MW | 3.5 yrs | 64.6 |
| MIGHOWARD | Substation-Adjacent | TX | Starr County | 345 kV | 600 MW | 3.5 yrs | 64.5 |
| DEL SOL | Substation-Adjacent | TX | Starr County | 345 kV | 600 MW | 3.5 yrs | 64.1 |
| JACKIE HOWARD | Substation-Adjacent | TX | Starr County | 345 kV | 600 MW | 3.5 yrs | 63.4 |
| UNKNOWN305583 | Substation-Adjacent | TX | Hidalgo County | 138 kV | 100 MW | 3.5 yrs | 62.5 |
How does RIO GRANDE CITY compare with other substations in Texas?
Texas has 4,939 substation records in HIFLD, of which 1,426 carry a station name; the rest are unnamed tap points, risers and line ends. 165 named substations in the state are in RIO GRANDE CITY's 69–114 kV band (12% of named stations). 1,256 sit in a higher band. 200 named substations in Texas operate at 345 kV or above. The highest voltage recorded in the state is 500 kV, and the state median is 138 kV.
Who owns the transmission lines at RIO GRANDE CITY?
The 1 connected line listed above is owned by AEP TEXAS CENTRAL COMPANY. Line voltages range from 69 kV to 69 kV. Their combined recorded length is about 0.1 miles.
How do candidate sites near RIO GRANDE CITY score?
The 8 highest-scoring candidate sites within about 25 miles range from 63 to 66 on the 0–100 DC Readiness scale. They fall in Hidalgo, Starr County, Hidalgo County. The Texas average across 6,839 scored sites is 56.4. 3,635 of those Texas sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is RIO GRANDE CITY substation?
RIO GRANDE CITY has a maximum voltage of 69 kV. That places it in the 69–114 kV band. The median named US substation in this dataset is 115 kV, so RIO GRANDE CITY is below the national midpoint.
How many transmission lines connect to RIO GRANDE CITY substation?
1 transmission line terminate at or pass through RIO GRANDE CITY in the HIFLD line data. The connected lines listed here run at 69 kV. Together the listed lines cover about 0.1 miles.
Who owns RIO GRANDE CITY substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at RIO GRANDE CITY belong to AEP TEXAS CENTRAL COMPANY. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is RIO GRANDE CITY substation located?
RIO GRANDE CITY is in Texas at 26.4528, -98.7423. The datacenter candidate sites closest to it are in Hidalgo, Starr County, Hidalgo County.
Are there datacenter candidate sites near RIO GRANDE CITY substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of RIO GRANDE CITY. The highest-scoring is OZ Hidalgo at 66/100. Across Texas, the average DC Readiness score is 56.4.
Other 69 kV substations in Texas
- GREENS BAYOU 69· 9 lines
- ELGIN SWITCHING· 6 lines
- TAYLOR· 5 lines
- DEVINE· 4 lines
- DEVINE· 4 lines
- FISH CREEK 69· 4 lines
- FREEPORT· 4 lines
- LEACH· 4 lines
- All named substations in Texas· 1,426 stations
- Datacenter candidate sites in Texas· 6,839 sites
- Brownfield and retired plant sites in Texas
- Substations by state
About this data
Source: HIFLD Electric Substations and Transmission Lines (U.S. Department of Homeland Security), as published June 29, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: GridCensus, “RIO GRANDE CITY substation, Texas”, https://gridcensus.com/substations/texas/rio-grande-city-259ffce4 (data as of June 29, 2026).
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
Every site and score for RIO GRANDE CITY substation, Texas is free to browse. Pro adds Watchtower on 25 sites, alerts when new candidate sites, datacenters or interconnection-queue requests appear in your markets, score and capacity history, and CSV export. Enterprise adds team seats, weekly data files for all 147,272 sites, the REST API and an MCP server for AI tools.