Registry, engineering, and operating metrics shown on a consistent EIA basis.
| Metric | Mark One Power Station Brazoria County | Brotman Power Station Brazoria County |
|---|---|---|
| Capacity | 484 MW | 484 MW |
| Technology | Natural Gas Fired Combustion Turbine | Natural Gas Fired Combustion Turbine |
| Operator | City of San Antonio - (TX) | ProEnergy Services |
| Operating units | 8 | 8 |
| Latest 12-month generation | 395.8 GWh | 248.2 GWh |
| Latest complete-year capacity factor | 8.3% (2025) | 7.0% (2025) |
| National technology rank | #93 of 825 | #93 of 825 |
| Latest EIA report | 2026-04 | 2026-04 |
Generation comes from EIA-923. Capacity, unit counts, technology, and reporting relationships come from EIA-860. Incomplete reporting years are excluded from capacity-factor comparisons.