Topaz Generating
Galveston County, Texas · EIA plant ID 63688 · Operator: City of San Antonio - (TX)
Nameplate605MWSummer 445 MW
Generators10in service
Net generation502GWh12 mo to Aug 2026
Capacity factor13%gas/coal/oil units, summer MW
Heat rate10,342Btu/kWhfossil units, electric fuel, HHV
First online2021Runs as peaking
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), gas/coal/oil units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2021 | 168.6 | 9.4% | 10,294 |
| 2022 | 663.9 | 17.0% | 10,237 |
| 2023 | 722.3 | 18.5% | 10,125 |
| 2024 | 688.7 | 17.6% | 10,298 |
| 2025 | 598.6 | 15.4% | 10,353 |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| CTG-1 | Natural Gas Fired Combustion Turbine | GT | 60.5 | 44.5 | Jul 2021 | Operating | — | coming soon |
| CTG-2 | Natural Gas Fired Combustion Turbine | GT | 60.5 | 44.5 | Jul 2021 | Operating | — | coming soon |
| CTG-3 | Natural Gas Fired Combustion Turbine | GT | 60.5 | 44.5 | Jul 2021 | Operating | — | coming soon |
| CTG-4 | Natural Gas Fired Combustion Turbine | GT | 60.5 | 44.5 | Jul 2021 | Operating | — | coming soon |
| CTG-5 | Natural Gas Fired Combustion Turbine | GT | 60.5 | 44.5 | Jul 2021 | Operating | — | coming soon |
| CTG-6 | Natural Gas Fired Combustion Turbine | GT | 60.5 | 44.5 | Jul 2021 | Operating | — | coming soon |
| CTG-7 | Natural Gas Fired Combustion Turbine | GT | 60.5 | 44.5 | Jul 2021 | Operating | — | coming soon |
| CTG-8 | Natural Gas Fired Combustion Turbine | GT | 60.5 | 44.5 | Aug 2021 | Operating | — | coming soon |
| CTG-9 | Natural Gas Fired Combustion Turbine | GT | 60.5 | 44.5 | Oct 2021 | Operating | — | coming soon |
| CTG10 | Natural Gas Fired Combustion Turbine | GT | 60.5 | 44.5 | Aug 2021 | Operating | — | coming soon |
Owner / operator
Operator: City of San Antonio - (TX). Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Topaz Generating, LLC | 70.0% | 424 MW |
| Topaz II, LLC | 30.0% | 182 MW |
Nearby plants
Within 80 km.
| Red Egret | — | 2.8 km |
| Heights | 10 MW | 4.8 km |
| Zeya | — | 5 km |
| GCWA | 7 MW | 5.6 km |
| Texas City Power Plant | 450 MW | 6.2 km |
| Texas City Plant Union Carbide | 26 MW | 6.3 km |