Topaz Generating
Natural gas power plant · Galveston County, Texas
Nameplate capacity
605 MW
Rank in Texas
#71
of 1,071 plants
In service since
2021
July 2021
Details
- Primary fuel
- Natural gas
- Technology
- Natural Gas Fired Combustion Turbine
- Operator
- City of San Antonio - (TX)
- County
- Galveston County
- Generating units
- 10
- Share of state capacity
- 0.30%
- Rank among natural gas plants in Texas
- #53 of 310
- EIA plant code
- 63688
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| CTG-1 | Natural Gas Fired Combustion Turbine | 61 MW | 45 MW | 2021 | Operating |
| CTG-2 | Natural Gas Fired Combustion Turbine | 61 MW | 45 MW | 2021 | Operating |
| CTG-3 | Natural Gas Fired Combustion Turbine | 61 MW | 45 MW | 2021 | Operating |
| CTG-4 | Natural Gas Fired Combustion Turbine | 61 MW | 45 MW | 2021 | Operating |
| CTG-5 | Natural Gas Fired Combustion Turbine | 61 MW | 45 MW | 2021 | Operating |
| CTG-6 | Natural Gas Fired Combustion Turbine | 61 MW | 45 MW | 2021 | Operating |
| CTG-7 | Natural Gas Fired Combustion Turbine | 61 MW | 45 MW | 2021 | Operating |
| CTG-8 | Natural Gas Fired Combustion Turbine | 61 MW | 45 MW | 2021 | Operating |
| CTG-9 | Natural Gas Fired Combustion Turbine | 61 MW | 45 MW | 2021 | Operating |
| CTG10 | Natural Gas Fired Combustion Turbine | 61 MW | 45 MW | 2021 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in Texas
| Five Wells Solar Center - Hybrid | Solar | 618 MW |
| Lost Pines 1 Power Project | Natural gas | 609 MW |
| R W Miller | Natural gas | 604 MW |
| Freeport Energy | Natural gas | 603 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 605 MW solar plant and a 605 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Texas power plants · What Texas actually generates