Medina County, Texas: power grid and siting data
Medina County is in ERCOT's SOUTH load zone. It has 19 mapped substations, owned mostly by STEC, AEP Texas and CPS Energy; the highest voltage is 138 kV. The ERCOT queue lists 2 generation projects (2 solar) and 5 battery storage projects here.
Substations in Medina County
10 at 138 kV, 9 at 69 kV and below.
| Substation | Voltage | Owner | Lines | |
|---|---|---|---|---|
| Hondo Creek | 138 kV | STEC | 5 | map |
| Pearson | 138 kV | STEC | 4 | map |
| Tap307847 | 138 kV | Weirich William Richard | 4 | map |
| Castroville | 138 kV | CPS Energy | 3 | map |
| Razorback | 138 kV | AEP Texas | 3 | map |
| Hondo | 138 kV | CPS Energy | 2 | map |
| Talley Road | 138 kV | CPS Energy | 2 | map |
| Seco | 138 kV | STEC | 1 | map |
| Castroville | 138 kV | STEC | 0 | map |
| Quihi 138kv | 138 kV | AEP Texas | map | |
| Devine | 69 kV | STEC | 4 | map |
| Devine | 69 kV | AEP Texas | 4 | map |
| Tap302617 | 69 kV | not recorded | 3 | map |
| Tap308064 | 69 kV | not recorded | 3 | map |
| Lytle | 69 kV | AEP Texas | 3 | map |
| Hondo | 69 kV | STEC | 2 | map |
| Natalia | 69 kV | STEC | 2 | map |
| D'Hanis | 69 kV | STEC | 2 | map |
| Bader | 69 kV | STEC | 2 | map |
ERCOT interconnection queue
2 generation projects are queued in Medina County: 2 solar. By stage: 2 in full interconnection study. 5 battery storage projects are queued, 0 with a signed interconnection agreement.
From the ERCOT GIS report. Project names, developers, MW and dates are on Pro.
Planned transmission
26 planned grid projects touch Medina County: 9 new substations, 14 new or rebuilt lines and 3 substation upgrades, 7 at 345 kV or above; 1 already energized.
Wholesale power prices
The SOUTH load zone averaged $48.57/MWh day-ahead over the last 7 days. Nearest generator pricing nodes: SHAW_SLR_RN $45.09, MROW_SLR_RN $45.48 and HRZN_SLR_UN1 $45.48.
ERCOT day-ahead settlement point prices. Hourly history, battery spreads and real-time prices are on the map.
Data centers and large loads
5 announced data center campuses in Medina County, 2 at or above ERCOT's 75 MW large load threshold.
- CyrusOne plans $500M data center in Castroville San Antonio Express-News 2026-07-01
- Three Charts for the Data-Center Conversation You're About to Have The Grid Report 2026-05-19
- 265-acre Texas tech park tied to San Antonio draws backlash MySA 2026-05-12
- County approves 80% tax break for CyrusOne data center The Devine News 2025-11-05
- Lytle approves development agreement for hyperscaler project The Devine News 2025-06-04
Jurisdiction
Nearest city to the county center: Hondo (0.8 mi). Outside city limits and ETJ, development falls under county rules and state law. City limits and estimated ETJ are on the map.
Nearby counties
See Medina County on the map
Every substation, line, queue project, pipeline and price node in Texas, plus Dub, an AI landman who answers questions about any spot. Free account, no card.
Sources: HIFLD and OpenStreetMap substations and lines, ERCOT GIS report (queue, 2026-09), ERCOT day-ahead prices, TxDOT and StratMap boundaries, Barrio Energy research. Updated 2026-11-09. Screening data only; the serving utility confirms capacity.