Galveston County, Texas: power grid and siting data
Galveston County is in ERCOT's HOUSTON load zone. It has 50 mapped substations, owned mostly by TNMP, CenterPoint and Ineos Acetyls Chemicals Texas City Inc; the highest voltage is 345 kV. The ERCOT queue lists 2 generation projects (1 gas and 1 wind) and 10 battery storage projects here.
Substations in Galveston County
1 at 345 kV, 49 at 138 kV. The 30 highest-voltage stations are listed; the map shows all 50.
| Substation | Voltage | Owner | Lines | |
|---|---|---|---|---|
| Ph Robinson | 345 kV | CenterPoint | 16 | map |
| Heights | 138 kV | TNMP | 9 | map |
| Texas City Main | 138 kV | TNMP | 6 | map |
| Caddo | 138 kV | TNMP | 6 | map |
| Unnamed station | 138 kV | Ineos Acetyls Chemicals Texas City Inc | 5 | map |
| Apache | 138 kV | Union Carbide Corp | 4 | map |
| Freeway Park | 138 kV | TNMP | 4 | map |
| Tiki Island | 138 kV | CenterPoint | 4 | map |
| Greenbelt | 138 kV | TNMP | 4 | map |
| Unnamed station | 138 kV | Blanchard Refining Co Llc | 4 | map |
| West Galveston | 138 kV | CenterPoint | 4 | map |
| Tap302642 | 138 kV | Texas City Terminal Railway Co | 3 | map |
| Tap302695 | 138 kV | TNMP | 3 | map |
| Stewart | 138 kV | CenterPoint | 3 | map |
| League City Main | 138 kV | TNMP | 3 | map |
| Choctaw | 138 kV | TNMP | 3 | map |
| Tap305251 | 138 kV | Texas City Terminal Railway Co | 3 | map |
| Tap305405 | 138 kV | CenterPoint | 3 | map |
| Terminal | 138 kV | TNMP | 3 | map |
| Tap307909 | 138 kV | TNMP | 3 | map |
| Tap307990 | 138 kV | not recorded | 3 | map |
| La Marque | 138 kV | CenterPoint | 3 | map |
| Tejas | 138 kV | TNMP | 3 | map |
| Tap310677 | 138 kV | CenterPoint | 3 | map |
| Tap310718 | 138 kV | CenterPoint | 3 | map |
| Cherokee | 138 kV | TNMP | 2 | map |
| Alta Loma | 138 kV | CenterPoint | 2 | map |
| Northside | 138 kV | TNMP | 2 | map |
| Moody Reit | 138 kV | CenterPoint | 2 | map |
| Seminole | 138 kV | TNMP | 2 | map |
ERCOT interconnection queue
2 generation projects are queued in Galveston County: 1 gas and 1 wind. By stage: 1 with a signed interconnection agreement and 1 in full interconnection study. 10 battery storage projects are queued, 5 with a signed interconnection agreement.
From the ERCOT GIS report. Project names, developers, MW and dates are on Pro.
Planned transmission
17 planned grid projects touch Galveston County: 5 new substations, 9 new or rebuilt lines and 3 substation upgrades, 9 at 345 kV or above.
Wholesale power prices
The HOUSTON load zone averaged $44.60/MWh day-ahead over the last 7 days. Nearest generator pricing nodes: TXCTY_CTA $58.25, UCC_COG_PUN2 $58.37 and TOPAZ_ALL $58.21.
ERCOT day-ahead settlement point prices. Hourly history, battery spreads and real-time prices are on the map.
Data centers and large loads
- League City now requires developers to secure special use permit for data centers Community Impact 2026-10-28
- 410,000 Megawatts in Four Years: ERCOT Tells the Legislature the Queue Just Broke Reality The Grid Report 2026-04-17
Jurisdiction
Nearest city to the county center: La Marque (0 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 Galveston 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.