35th largest plant in Texas · 343rd nationally
Rio Nogales Power Project is a natural gas power plant in Texas with a nameplate capacity of 940 MW. It generates roughly 4.4M MWh per year — enough to power about 416,853 average U.S. homes.
Its capacity factor of 53% puts it in the middle range — running steadily but not full-time. At 844 lb CO₂/MWh, its emission rate sits above the national grid average of roughly 800 lb/MWh.
Ghost bars are each month's theoretical maximum (940 MW nameplate × hours in the month). Filled bars are actual net generation reported to EIA Form 923. The gap between them is capacity factor made visible.
| Plant Name | Rio Nogales Power Project |
|---|---|
| Operator | City Of San Antonio - (Tx) |
| City | Seguin |
| County | Guadalupe County |
| State | Texas |
| ZIP | 78155 |
| Coordinates | 29.59306, -97.97321 |
This plant highlighted in navy-ringed pin; other generators within 25 miles shown as fuel-colored dots.
| ID | Technology | Fuel | Capacity | Status | Online |
|---|---|---|---|---|---|
| STG1 | Natural Gas Fired Combined Cycle | Natural Gas | 373 MW | Operating | 2002 |
| CTG1 | Natural Gas Fired Combined Cycle | Natural Gas | 189 MW | Operating | 2002 |
| CTG2 | Natural Gas Fired Combined Cycle | Natural Gas | 189 MW | Operating | 2002 |
| CTG3 | Natural Gas Fired Combined Cycle | Natural Gas | 189 MW | Operating | 2002 |
| CO₂ | 1.8M metric tons |
|---|---|
| SO₂ | 9 metric tons |
| NOₓ | 278 metric tons |
| CO₂ Rate | 844 lb/MWh |
Annual totals and CO₂ rate reported by EPA eGRID for 2023. Reference averages are approximate U.S.-wide figures from the same dataset.
| NERC Region | TRE |
|---|---|
| Balancing Authority | Electric Reliability Council Of Texas, Inc. |
Natural gas plants are the workhorse of the modern grid. Combined-cycle units achieve very high efficiency and can ramp up and down quickly to balance variable renewables. They emit roughly half the CO₂ per MWh of coal and far less of other pollutants, but they still release upstream methane during fuel extraction.