HO Clarke Generating
Harris County, Texas · EIA plant ID 63335 · Operator: City of San Antonio - (TX)
Nameplate484MWSummer 356 MW
Generators8in service
Net generation347GWh12 mo to Aug 2026
Capacity factor11%gas/coal/oil units, summer MW
Heat rate10,689Btu/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 | 235.3 | 10.9% | 10,429 |
| 2022 | 347.2 | 11.1% | 10,306 |
| 2023 | 414.6 | 13.3% | 10,020 |
| 2024 | 474.3 | 15.2% | 10,328 |
| 2025 | 335.5 | 10.8% | 10,759 |
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 | Mar 2021 | Operating | — | coming soon |
| CTG-2 | Natural Gas Fired Combustion Turbine | GT | 60.5 | 44.5 | Mar 2021 | Operating | — | coming soon |
| CTG-3 | Natural Gas Fired Combustion Turbine | GT | 60.5 | 44.5 | Mar 2021 | Operating | — | coming soon |
| CTG-4 | Natural Gas Fired Combustion Turbine | GT | 60.5 | 44.5 | Mar 2021 | Operating | — | coming soon |
| CTG-5 | Natural Gas Fired Combustion Turbine | GT | 60.5 | 44.5 | Mar 2021 | Operating | — | coming soon |
| CTG-6 | Natural Gas Fired Combustion Turbine | GT | 60.5 | 44.5 | Mar 2021 | Operating | — | coming soon |
| CTG-7 | Natural Gas Fired Combustion Turbine | GT | 60.5 | 44.5 | Oct 2021 | Operating | — | coming soon |
| CTG-8 | Natural Gas Fired Combustion Turbine | GT | 60.5 | 44.5 | Oct 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).
| HO Clarke Generating, LLC | 75.0% | 363 MW |
| HO Clarke II, LLC | 25.0% | 121 MW |
Nearby plants
Within 80 km.
| Callisto II Energy Center | — | 0.1 km |
| Pamela Heights I Energy Center | — | 0.1 km |
| Callisto I Energy Center | 223 MW | 0.2 km |
| Friendswood Energy | 265 MW | 0.2 km |
| OTHERTraditionBuffalo | 1 MW | 5 km |
| Telview ESS | 10 MW | 8.1 km |