Registry, engineering, and operating metrics shown on a consistent EIA basis.
| Metric | Mark One Power Station Brazoria County | Bacliff Galveston County |
|---|---|---|
| Capacity | 484 MW | 427.2 MW |
| Technology | Natural Gas Fired Combustion Turbine | Natural Gas Fired Combustion Turbine |
| Operator | City of San Antonio - (TX) | PHR Holdings LLC |
| Operating units | 8 | 6 |
| Latest 12-month generation | 395.8 GWh | 100.8 GWh |
| Latest complete-year capacity factor | 8.3% (2025) | 2.8% (2025) |
| National technology rank | #93 of 825 | #111 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.